EP0298277A1 - Method for producing electric insulating coatings on surfaces of metals - Google Patents
Method for producing electric insulating coatings on surfaces of metals Download PDFInfo
- Publication number
- EP0298277A1 EP0298277A1 EP88109337A EP88109337A EP0298277A1 EP 0298277 A1 EP0298277 A1 EP 0298277A1 EP 88109337 A EP88109337 A EP 88109337A EP 88109337 A EP88109337 A EP 88109337A EP 0298277 A1 EP0298277 A1 EP 0298277A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parts
- weight
- metal surface
- aqueous preparation
- synthetic resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 34
- 239000002184 metal Substances 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 150000002739 metals Chemical class 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000002360 preparation method Methods 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 19
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 16
- 239000000057 synthetic resin Substances 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000001412 amines Chemical class 0.000 claims abstract description 7
- 239000001023 inorganic pigment Substances 0.000 claims abstract description 7
- 239000012860 organic pigment Substances 0.000 claims abstract description 7
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 3
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 3
- -1 maleic acid ester Chemical class 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 229910021538 borax Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229920001225 polyester resin Polymers 0.000 claims description 8
- 239000004645 polyester resin Substances 0.000 claims description 8
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 229930195733 hydrocarbon Natural products 0.000 claims description 7
- 150000002430 hydrocarbons Chemical class 0.000 claims description 7
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 6
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000000049 pigment Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 4
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- 239000004640 Melamine resin Substances 0.000 claims description 3
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229960002887 deanol Drugs 0.000 claims description 3
- 229910021485 fumed silica Inorganic materials 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical class C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- 229920000126 latex Polymers 0.000 claims description 2
- 239000011976 maleic acid Substances 0.000 claims description 2
- 229920000620 organic polymer Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 2
- 239000004328 sodium tetraborate Substances 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 2
- 229910001854 alkali hydroxide Inorganic materials 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 29
- 239000007788 liquid Substances 0.000 description 15
- 238000003466 welding Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000137 annealing Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 5
- 229910004844 Na2B4O7.10H2O Inorganic materials 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 235000009161 Espostoa lanata Nutrition 0.000 description 1
- 240000001624 Espostoa lanata Species 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910004835 Na2B4O7 Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000012972 dimethylethanolamine Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
Definitions
- the invention relates to a method for producing electrically insulating coatings on metal surfaces and its application to the production of electrically insulating coatings on metal surfaces made of silicon-containing steel.
- Such insulating layers can be inorganic and organic in nature and can be formed, for example, by means of treatment liquids containing chromic acid and / or phosphoric acid or phosphate. Although their insulating effect is mostly of satisfactory quality, the wear of the punching tools is generally comparatively high. Chromic acid is also undesirable in terms of workplace hygiene and environmental protection.
- insulating coatings which are produced by applying treatment fluids based on organic resins, possibly with inorganic additives, often extends the tool life, but their adhesive strength after stress relief annealing and their influence on the formation of the weld seam are generally unsatisfactory.
- Another type of insulating layer which is formed by applying treatment fluids based on organic resins with fluorides of polyvalent metals, in particular aluminum fluoride, is very limited in the insulation thickness with regard to its satisfactory weldability. Furthermore, it cannot be ruled out that combinations of organic resins with fluorides of polyvalent metals, by burning the insulation layer, as is common in the welding process, will release environmentally harmful substances (EP - A - 209 940).
- the object of the invention is to provide a method for producing electrically insulating coatings on metal surfaces, in particular of silicon-containing steel, which does not have the disadvantages of the aforementioned methods of the prior art.
- drying up means first of all evaporation of the solvent of the preparation and does not exclude that in parallel e.g. chemical reactions within the components or between the components of the preparation, e.g. Crosslinking curing reactions and the like, as well as between the components and the metal surface.
- the method according to the invention is suitable for the treatment of surfaces of different metals. However, it is of particular importance for the production of coatings on iron and iron alloys, in particular those with silicon as an alloy component, and other substrates known as magnetic materials.
- the material to be insulated is usually in the form of sheet metal in the form of a strip or sheet.
- the method according to the invention can also be applied to workpieces of different shapes.
- An essential component of the aqueous preparation to be used according to the method according to the invention is a synthetic resin which can be diluted with water.
- Suitable resins are polyester, polyamide, epoxy, phenol, melamine resin and / or latices based on acrylic acid, maleic acid ester, styrene, butadiene, ethylene and / or vinyl acetate.
- the dilutability with water is determined by the presence of neutralizable acid groups and / or by the In the presence of suitable emulsifiers.
- An alkylphenol-modified polyester resin with an acid number of 90 to 110 and a molecular weight of 7,000 to 15,000 has proven particularly advantageous.
- Polyethylene, polypropylene, polytetrafluoroethylene and / or polyamide can be used as the dispersed, waxy substance. Particularly favorable coating properties are achieved with micronized polyethylene wax.
- the melting point of the wax is preferably selected so that at least part of the wax liquefies during the heating phase.
- the wax component makes a significant contribution to the good punchability of sheet metal coated with the process according to the invention.
- the task of the inorganic and / or organic pigment is to increase the electrical insulating properties and to improve the welding of punched-out laminated cores in such a way that a welding bead is placed over the cutting edges lying one on top of the other.
- the welding speed can be increased in part up to over 1500 mm / min without pores and voids in the weld seam and annoying soot deposits on both sides of the weld seam.
- the service life of the welding electrodes is extended considerably.
- Silicates, talc, polymers formed from vinyl groups or substituted vinyl groups and / or copolymers of polyvinylidene chloride or methyl methacrylate with acrylonitrile are preferably used as pigments for the process according to the invention.
- the particle size is between 0.1 and 50 ⁇ m, preferably between 2 and 15 microns.
- Organic polymer pigments behave particularly advantageously and expand to particle sizes of 2 to 40 ⁇ m during heating.
- the borate used in the preparation according to the invention can be introduced in the form of boric acid or its alkali salt.
- the dimensioning is preferably such that 0.1 to 20 parts by weight of borate component, calculated as borax, account for 100 parts by weight of synthetic resin.
- borate component calculated as borax
- the borate content has a favorable influence on the adhesion of the coating after thermal loads in the range from 500 to 850 ° C.
- alkanolamines e.g. Dimethylaminoethanol, and / or dimethylamine used.
- the above-mentioned components are preferably present in the preparation according to the invention, based on 100 parts by weight of synthetic resin, in the following amounts: 0.1 to 40 parts by weight of dispersed waxy substance 1 to 60 parts by weight of inorganic and / or organic pigment 0.1 to 40 parts by weight of borate and 0.1 to 20 parts by weight of organic amine.
- the aqueous preparation contains pyrogenic silica which preferably in amounts of 0.1 to 40 parts by weight, based on 100 parts by weight of synthetic resin. This component improves the coating properties after previous annealing operations and, on the other hand, enables the rheological behavior of the preparation and the moist film to be influenced.
- surfactants are preferably used in it.
- the dosing instructions 0.1 to 10, in particular 0.2 to 3 parts by weight of surfactant per 100 parts by weight of synthetic resin have proven to be favorable.
- surface-active ethyne compounds e.g. tertiary Ethinglykol, used because they offer a favorable combination of wetting, dispersing and anti-foam properties.
- defoamers e.g. in amounts of 0.1 to 10, preferably 0.2 to 4, parts by weight, based on 100 parts by weight of synthetic resin.
- Aqueous treatment liquids often have the property of emulsifying air bubbles under the action of shear forces. This effect can be counteracted by the use of defoamers, preferably based on hydrocarbons, oxyethylated compounds and silicon-containing components.
- the preparation according to the invention is usually used with a dry residue of 10 to 80% by weight, the rest water. You can apply it to the metal surface using all methods known from painting technology, e.g. Dipping, spraying, flooding, pouring, painting and rolling take place. When coating sheet metal in strip and sheet form, however, roller application is preferred.
- the moist film is also heated in order to dry and form it in the facilities known from painting technology.
- the layer thickness of the moist film of the treatment liquid applied to the belt and the resulting layer thickness of the insulation layer after drying depends in particular on the dry residue contained in the treatment liquid, the quantitative promotion of the treatment liquid by the roller combination of the coating chair, in particular on the contact pressure of the individual rollers against one another , the speed of rotation of the application roller in relation to the speed of the steel belts.
- coating can take place at a belt speed of up to approximately 120 m / min and more.
- the subsequent drying of the layer takes place at 120 to 350 ° C (object temperature), expediently in a continuous oven for 1 hour to 5 seconds.
- object temperature expediently in a continuous oven for 1 hour to 5 seconds.
- the longer time applies for low temperatures and the shorter time for higher temperatures.
- a residence time in the oven of 20 seconds at 300 ° C applies.
- the strips can be brought into contact with the treatment liquid mentioned on one side and / or on both sides with the aid of the aforementioned coating system.
- the insulated tapes are further processed as broadband and / or split in the longitudinal direction with the aid of splitting systems.
- the particularly good adhesive strength and the elasticity of the insulation layer resulting from the treatment liquid described are advantageous. Peeling off the insulating layer would damage the remaining insulated surface of the tapes.
- the particularly good resistance of the insulation layer described to corrosion during storage in rooms with particularly high atmospheric humidity is advantageous.
- the insulation layer gives the sheet excellent protection against corrosion.
- the stamped parts are stacked and often welded to their sides. It is particularly advantageous here that this welding process, due to the special composition of the insulation layer, enables a welding speed of more than 1500 mm / min without pores and / or void formation.
- the method according to the invention offers, inter alia - Excellent insulation of the metal surfaces against the passage of electrical currents - good punchability of the insulated sheets - reduced wear of the punching tools - good adhesion of the coatings during and after mechanical stress - Excellent weldability of the stamped sections provided with the coating and stacked - Excellent adhesion of the coatings remaining after a temperature stress between 500 and 850 ° C - absence of toxic components.
- a particular advantage of the invention is that an excellent electrical surface resistance of the sheets is achieved even with very small layer thicknesses.
- the preferred method of working with freedom of the treatment liquid from chromium compounds, in particular from chromate compounds, and organic solvents also has the advantage that environmental damage is avoided and special precautionary measures during strip treatment can be dispensed with.
- This preparation was applied to the surface of a Si-alloyed electrical steel sheet with a nominal thickness of 0.5 mm (grade V 700-50 A according to DIN 46400 Part 1) using a rubber roller on both sides. To dry the coating, the coated sheets were then treated at a temperature of 300 ° C. over a period of 20 seconds. The average dry layer thickness was 1 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- Example 2 The same treatment liquid as in Example 1 was brought into contact with an Si-alloyed electrical steel sheet. Processing was also carried out under the conditions of Example 1.
- the average dry film thickness was 4 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- an alkylphenol-modified polyester resin (as in Example 1) were mixed with 25 parts by weight of an acrylic resin, 30 parts by weight of a partially hydroxymethylated melamine resin, 8 parts by weight of a micronized polyethylene wax, 12.0 parts by weight.
- Parts copolymer of methyl methacrylate / acrylonitrile in spherical form average particle diameter 10 microns
- 7.0 parts by weight of sodium borate calculated as Na2B4O7.10H2O
- 8.0 parts by weight of an alkanolamine 6.5 parts by weight of pyrogenic Silicic acid
- 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of deionized water a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components.
- the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- a layered silicate (average particle diameter 10 ⁇ m), 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O), 8.0 parts by weight of an alkanolamine, 6.5 parts by weight of pyrogenic silica, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of fully deionized water.
- the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8 Parts by weight of a micronized polyethylene wax, 12.0 parts by weight of a copolymer of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 12 microns), 20 parts by weight of aluminum fluoride (calculated as AlF3.3H2O), 7 parts by weight of sodium borate (calculated as Na2B4O7 10H2O, 14 parts by weight of dimethylethanolamine and 115 parts by weight of demineralized water mixed.
- AlF3.3H2O aluminum fluoride
- sodium borate (calculated as Na2B4O7 10H2O, 14 parts by weight of dimethylethanolamine and 115 parts by weight of demineralized water mixed.
- the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- an alkylphenol-modified polyester resin 100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8.0 parts by weight of a micronized polyethylene wax, 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O), 8.0 parts by weight.
- a micronized polyethylene wax 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O)
- 8.0 parts by weight - Part of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of Ethinglykol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of demineralized water.
- the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- an alkylphenol-modified polyester resin 100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were with 8.0 parts by weight of a micronized polyethylene wax, 20 parts by weight of aluminum fluoride (calculated as AlF3.3H2O), 7.0 parts by weight Sodium borate (calculated as Na2B4O7.10H2O), 15 parts by weight of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ether glycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight demineralized water mixed.
- the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
- the quality of the insulation layer produced is shown in the table below.
- Line 2 shows the stability of the treatment liquid after a storage period under normal conditions of more than 4 weeks.
- the homogeneity of the treatment liquid was assessed visually.
- the viscosity was determined according to DIN 53211, 4 mm B immediately after production. This value was compared with the value measured after a storage period of the treatment liquid of more than 4 weeks.
- Line 3 specifies the dry layer thickness of the insulation layers resulting from the treatment liquids, under which the test results were determined. It is an average of 20 to 50 individual measurements.
- in line 4 is the interlaminar contact resistance in ohms. cm2 at a contact pressure of 100 N / cm2 an electrode area of 4 cm and a voltage of 100 mV for the double insulating layer on the electrical sheet before annealing.
- the evaluation with R 50 means that 50% of the measured values are above the specified resistance value.
- line 5 the contact resistance is as explained for line 4, but after annealing the insulation layer for one hour at 600 ° C in air.
- the adherence which also includes a statement about the stretchability of the layer, according to line 6 was determined by bending tests around the conical mandrel.
- Line 7 shows the area which after annealing for one hour at 600 ° C in air by applying and tearing off an adhesive tape still covers the surface of the steel sheet as firmly adhering insulation.
- Line 8 lists the corrosion-protecting properties of the insulation layer on steel sheets. The determination was carried out by the climate change test in accordance with DIN 50017, in which the coated sheet metal was first exposed to an atmosphere of 40 ° C. and 100% relative atmospheric humidity for 8 hours and then to a normal room climate for 16 hours.
- cross cuts up to the metal surface create 1 mm2 fields.
- the damaged or detached fields are then determined by applying and tearing off an adhesive tape. This determination was carried out in accordance with DIN 53151.
- Line 11 specifies the permissible speed at which the sheet stack is pressed at a pressure of 250 N / cm2 and a current of 90 to 120 A under an argon atmosphere, a flawless, non-porous weld can be drawn.
- Line 12 describes the proportion of soot development, which can occur when organic substances are burned, and which is deposited on the edges of the weld.
- Line 13 shows the stability of the welding electrode when welding the insulated and stacked stamped parts.
- the information indirectly also contains a statement about the possible length of the achievable welding path, without regrinding and / or readjusting the electrode being necessary.
- examples 1, 3 and 4 document an excellent welding speed at which non-porous weld seams can be drawn.
- Example 2 shows that with a thickness of the insulation layer of 4 ⁇ m ⁇ 0.5 ⁇ m a high one Welding speed with a non-porous weld results in comparison to Comparative Examples 2 and 3.
- Comparative Example 1 shows a high welding speed compared to Example 2, but this can only be achieved with very thin insulation thicknesses of 1 ⁇ m ⁇ 0.5 ⁇ m. Comparative example 1 also shows further decisive disadvantages in comparison with examples 1 to 4 with regard to the stability of the treatment liquid and corrosion protection.
- Examples 1 to 4 show that, in contrast to Comparative Examples 1 to 3, the invention combines all the good properties which are desirable for electrically insulating layers on steel sheets for the production of magnetic cores.
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Abstract
Bei einem Verfahren zur Erzeugung von elektrisch isolierenden Überzügen auf Metalloberflächen, insbesondere von siliziumhaltigem Stahl, trägt man auf die Metalloberfläche eine wäßrige Zubereitung, die a) mit Wasser verdünnbares Kunstharz, b) dispergierte, wachsartige Substanz mit einer Partikelgröße von 0,1 bis 20 µm und einem Schmelzpunkt von 80 bis 250°C, c) anorganisches und/oder organisches Pigment, d) Borat, e) Alkalihydroxid und/oder Ammoniak und/oder organisches Amin zur Einstellung eines pH-Wertes von 7 bis 9 enthält und frei von Fluorid ist, in einer Menge von 0,5 bis 20 g/m² (ber. als Trockensubstanz) auf und trocknet den feuchten Film anschließend bei 120 bis 350°C (Objekttemperatur) 1 Stunde bis 5 sec auf. Eine besonders geeignete Zubereitung enthält, bezogen auf 100 Gew.-Teile Kunstharz, 0,1 bis 40 Gew.-Teile dispergierte wachsartige Substanz 1 bis 60 Gew.-Teile anorganisches und/oder organisches Pigment 0,1 bis 40 Gew.-Teile Borat und 0,1 bis 20 Gew.-Teile organisches Amin.In a process for the production of electrically insulating coatings on metal surfaces, in particular of silicon-containing steel, an aqueous preparation is carried on the metal surface which comprises a) water-dilutable synthetic resin, b) dispersed, wax-like substance with a particle size of 0.1 to 20 μm and a melting point of 80 to 250 ° C, c) contains inorganic and / or organic pigment, d) borate, e) alkali hydroxide and / or ammonia and / or organic amine for adjusting a pH value of 7 to 9 and free of fluoride is in an amount of 0.5 to 20 g / m² (calculated as dry substance) and then dries the moist film at 120 to 350 ° C (object temperature) for 1 hour to 5 seconds. A particularly suitable preparation contains, based on 100 parts by weight of synthetic resin, 0.1 to 40 parts by weight of dispersed waxy substance 1 to 60 parts by weight of inorganic and / or organic pigment 0.1 to 40 parts by weight of borate and 0.1 to 20 parts by weight of organic amine.
Description
Die Erfindung betrifft ein Verfahren zur Erzeugung von elektrisch isolierenden Überzügen auf Metalloberflächen sowie dessen Anwendung auf die Erzeugung von elektrisch isolierenden Überzügen auf Metalloberflächen aus siliziumhaltigem Stahl.The invention relates to a method for producing electrically insulating coatings on metal surfaces and its application to the production of electrically insulating coatings on metal surfaces made of silicon-containing steel.
Es ist bekannt, bei der Herstellung von Magnetkernen für z.B. Elektromotoren, Transformatoren und dergleichen Elektroblech mit Isolierüberzügen zu versehen, anschließend zu stanzen, die Stanzabschnitte zu stapeln und gegebenenfalls an den Schnittkanten miteinander zu verschweißen.It is known in the manufacture of magnetic cores for e.g. To provide electric motors, transformers and the like electrical sheet with insulating coatings, then to punch, to stack the punched sections and, if necessary, to weld them together at the cut edges.
Derartige Isolierschichten können anorganischer sowie organischer Natur sein und beispielsweise mittels Chromsäure und/oder Phosphorsäure bzw. Phosphat enthaltender Behandlungsflüssigkeiten gebildet werden. Obgleich deren Isolierwirkung meist von zufriedenstellender Qualität ist, ist der Verschleiß der Stanzwerkzeuge im allgemeinen vergleichsweise hoch. Chromsäure ist zudem unter dem Aspekt der Arbeitsplatzhygiene und des Umweltschutzes unerwünscht.Such insulating layers can be inorganic and organic in nature and can be formed, for example, by means of treatment liquids containing chromic acid and / or phosphoric acid or phosphate. Although their insulating effect is mostly of satisfactory quality, the wear of the punching tools is generally comparatively high. Chromic acid is also undesirable in terms of workplace hygiene and environmental protection.
Eine andere Kategorie von Isolierüberzügen, die durch Applikation von Behandlungsflüssigkeiten auf Basis organischer Harze, gegebenenfalls mit anorganischen Zusätzen, erzeugt werden, verlängert zwar häufig die Werkzeugstandzeit, jedoch sind ihre Haftfestigkeit nach der Entspannungsglühung und ihr Einfluß auf die Ausbildung der Schweißnaht in der Regel unbefriedigend.Another category of insulating coatings, which are produced by applying treatment fluids based on organic resins, possibly with inorganic additives, often extends the tool life, but their adhesive strength after stress relief annealing and their influence on the formation of the weld seam are generally unsatisfactory.
Eine weitere Art von Isolierschichten, die durch Applikation von Behandlungsflüssigkeiten auf Basis organischer Harze mit Fluoriden von mehrwertigen Metallen, insbesondere Aluminiumfluorid, gebildet werden, ist in der Isolationsdicke bezüglich ihrer befriedigenden Schweißbarkeit sehr begrenzt. Weiterhin ist nicht auszuschließen, daß Kombinationen von organischen Harzen mit Fluoriden mehrwertiger Metalle durch Verbrennen der Isolationsschicht, wie dies beim Schweißvorgang üblich ist, umweltschädigende Stoffe freisetzen (EP - A - 209 940).Another type of insulating layer, which is formed by applying treatment fluids based on organic resins with fluorides of polyvalent metals, in particular aluminum fluoride, is very limited in the insulation thickness with regard to its satisfactory weldability. Furthermore, it cannot be ruled out that combinations of organic resins with fluorides of polyvalent metals, by burning the insulation layer, as is common in the welding process, will release environmentally harmful substances (EP - A - 209 940).
Aufgabe der Erfindung ist es, ein Verfahren zur Erzeugung von elektrisch isolierenden Überzügen auf Metalloberflächen, insbesondere von siliziumhaltigem Stahl, bereitzustellen, das die Nachteile der vorgenannten Verfahren des Standes der Technik nicht aufweist.The object of the invention is to provide a method for producing electrically insulating coatings on metal surfaces, in particular of silicon-containing steel, which does not have the disadvantages of the aforementioned methods of the prior art.
Die Aufgabe wird gelöst, indem das Verfahren der eingangs genannten Art entsprechend der Erfindung derart ausgestaltet wird, daß man auf die Metalloberfläche eine wäßrige Zubereitung, die
- a) mit Wasser verdünnbares Kunstharz
- b) dispergierte, wachsartige Substanz mit einer Partikelgröße von 0,1 bis 20 µm und einem Schmelzpunkt von 80 bis 250°C
- c) anorganisches und/oder organisches Pigment
- d) Borat
- e) Alkalihydroxid und/oder Ammoniak und/oder organisches Amin zur Einstellung eines pH-Wertes von 7 bis 9
- a) water-thinnable synthetic resin
- b) dispersed, waxy substance with a particle size of 0.1 to 20 microns and a melting point of 80 to 250 ° C.
- c) inorganic and / or organic pigment
- d) borate
- e) alkali metal hydroxide and / or ammonia and / or organic amine to adjust a pH from 7 to 9
Der Begriff "Auftrocknen" bedeutet dabei zunächst Verdampfung des Lösungsmittels der Zubereitung und schließt nicht aus, daß parallel hierzu z.B. chemische Reaktionen innerhalb der Komponenten oder zwischen den Komponenten der Zubereitung, wie z.B. Vernetzungs-Aushärungsreaktionen und dergl., sowie zwischen den Komponenten und der Metalloberfläche stattfinden.The term "drying up" means first of all evaporation of the solvent of the preparation and does not exclude that in parallel e.g. chemical reactions within the components or between the components of the preparation, e.g. Crosslinking curing reactions and the like, as well as between the components and the metal surface.
Das erfindungsgemäße Verfahren eignet sich für die Behandlung von Oberflächen unterschiedlichster Metalle. Besondere Bedeutung hat es jedoch für die Erzeugung von Überzügen auf Eisen und Eisenlegierungen, insbesondere solchen mit Silizium als Legierungsbestandteil, und anderen als Magnetwerkstoffe bekannten Substraten. Üblicherweise liegt das zu isolierende Material als Blech in Form von Band oder Tafeln vor. Das erfindungsgemäße Verfahren ist jedoch auch auf anders geformte Werkstücke anwendbar.The method according to the invention is suitable for the treatment of surfaces of different metals. However, it is of particular importance for the production of coatings on iron and iron alloys, in particular those with silicon as an alloy component, and other substrates known as magnetic materials. The material to be insulated is usually in the form of sheet metal in the form of a strip or sheet. However, the method according to the invention can also be applied to workpieces of different shapes.
Wesentlicher Bestandteil der nach dem erfindungsgemäßen Verfahren anzuwendenden wäßrigen Zubereitung ist ein mit Wasser verdünnbares Kunstharz. Geeignete Harze sind Polyester-, Polyamid-, Epoxy-, Phenol-, Melaminharz und/oder Latices auf Basis Acrylsäure, Maleinsäureester, Styrol, Butadien, Ethylen- und/oder Vinylacetat. Die Verdünnbarkeit mit Wasser wird durch das Vorhandensein neutralisierbarer saurer Gruppen und/oder durch die Gegenwart geeigneter Emulgatoren erreicht. Besonders vorteilhaft hat sich ein Alkylphenol-modifiziertes Polyesterharz mit einer Säurezahl von 90 bis 110 und einem Molekulargewicht von 7 000 bis 15 000 erwiesen.An essential component of the aqueous preparation to be used according to the method according to the invention is a synthetic resin which can be diluted with water. Suitable resins are polyester, polyamide, epoxy, phenol, melamine resin and / or latices based on acrylic acid, maleic acid ester, styrene, butadiene, ethylene and / or vinyl acetate. The dilutability with water is determined by the presence of neutralizable acid groups and / or by the In the presence of suitable emulsifiers. An alkylphenol-modified polyester resin with an acid number of 90 to 110 and a molecular weight of 7,000 to 15,000 has proven particularly advantageous.
Als dispergierte, wachsartige Substanz können Polyethylen, Polypropylen, Polytetrafluorethylen und/oder Polyamid verwendet werden. Besonders günstige Überzugseigenschaften werden mit mikronisiertem Polyethylenwachs erzielt. Der Schmelzpunkt des Wachses wird bevorzugt so ausgewählt, daß sich zumindest ein Teil des Wachses während der Erhitzungsphase verflüssigt. Die Wachskomponente liefert einen wesentlichen Beitrag zur guten Stanzbarkeit von mit dem erfindungsgemäßen Verfahren beschichtetem Blech.Polyethylene, polypropylene, polytetrafluoroethylene and / or polyamide can be used as the dispersed, waxy substance. Particularly favorable coating properties are achieved with micronized polyethylene wax. The melting point of the wax is preferably selected so that at least part of the wax liquefies during the heating phase. The wax component makes a significant contribution to the good punchability of sheet metal coated with the process according to the invention.
Aufgabe des anorganischen und/oder organischen Pigmentes ist, die elektrischen Isoliereigenschaften zu erhöhen und das Verschweißen von ausgestanzten Blechpaketen in der Weise, daß eine Schweißraupe über die aufeinanderliegenden Schnittkanten gelegt wird, zu verbessern. So kann die Schweißgeschwindigkeit zum Teil bis über 1500 mm/min gesteigert werden, ohne daß es zu Poren und Lunkern in der Schweißnaht und zu störenden Rußablagerungen zu beiden Seiten der Schweißnaht kommt. Ferner wird die Standzeit der Schweißelektroden erheblich verlängert.The task of the inorganic and / or organic pigment is to increase the electrical insulating properties and to improve the welding of punched-out laminated cores in such a way that a welding bead is placed over the cutting edges lying one on top of the other. In this way, the welding speed can be increased in part up to over 1500 mm / min without pores and voids in the weld seam and annoying soot deposits on both sides of the weld seam. Furthermore, the service life of the welding electrodes is extended considerably.
Als Pigmente für das erfindungsgemäße Verfahren werden vorzugsweise Silikate, Talkum, aus Vinylgruppen bzw. substituierten Vinylgruppen gebildete Polymere und/oder Copolymerisate von Polyvinylidenchlorid bzw. Methylmethacrylat mit Acrylnitril verwendet. Die Teilchengröße liegt zwischen 0,1 und 50 µm, vorzugsweise zwischen 2 und 15 µm. Besonders vorteilhaft verhalten sich organische Polymerpigmente, die während des Erhitzens zu Partikelgrößen von 2 bis 40 µm expandieren.Silicates, talc, polymers formed from vinyl groups or substituted vinyl groups and / or copolymers of polyvinylidene chloride or methyl methacrylate with acrylonitrile are preferably used as pigments for the process according to the invention. The particle size is between 0.1 and 50 µm, preferably between 2 and 15 microns. Organic polymer pigments behave particularly advantageously and expand to particle sizes of 2 to 40 μm during heating.
Das in der erfindungsgemäßen Zubereitung verwendete Borat kann in Form von Borsäure oder ihres Alkalisalzes eingebracht werden. Die Bemessung erfolgt vorzugsweise so, daß 0,1 bis 20 Gew.-Teile Borat-Komponente, gerechnet als Borax, auf 100 Gew.-Teile Kunstharz entfallen. Bei dem Einbringen in Form von Alkaliborat erübrigt sich üblicherweise die Mitverwendung von Alkalihydroxid zur Herstellung der Zubereitung. Der Boratanteil hat einen günstigen Einfluß auf die Haftung des Überzuges nach thermischen Belastungen im Bereich von 500 bis 850°C.The borate used in the preparation according to the invention can be introduced in the form of boric acid or its alkali salt. The dimensioning is preferably such that 0.1 to 20 parts by weight of borate component, calculated as borax, account for 100 parts by weight of synthetic resin. When it is introduced in the form of alkali borate, it is usually unnecessary to use alkali hydroxide for the preparation of the preparation. The borate content has a favorable influence on the adhesion of the coating after thermal loads in the range from 500 to 850 ° C.
Als organisches Amin werden vorzugsweise ein oder mehrere Alkanolamine, z.B. Dimethylaminoethanol, und/oder Dimethylamin verwendet.Preferably one or more alkanolamines, e.g. Dimethylaminoethanol, and / or dimethylamine used.
Die vorstehend genannten Komponenten liegen in der erfindungsgemäßen Zubereitung, bezogen auf 100 Gew.-Teile Kunstharz, vorzugsweise in folgenden Mengen vor:
0,1 bis 40 Gew.-Teile dispergierte wachsartige Substanz
1 bis 60 Gew.-Teile anorganisches und/oder organisches Pigment
0,1 bis 40 Gew.-Teile Borat und
0,1 bis 20 Gew.-Teile organisches Amin.
The above-mentioned components are preferably present in the preparation according to the invention, based on 100 parts by weight of synthetic resin, in the following amounts:
0.1 to 40 parts by weight of dispersed waxy substance
1 to 60 parts by weight of inorganic and / or organic pigment
0.1 to 40 parts by weight of borate and
0.1 to 20 parts by weight of organic amine.
Nach einer weiteren Ausführungsform der Erfindung enthält die wäßrige Zubereitung pyrogene Kieselsäure, die vorzugsweise in Mengen von 0,1 bis 40 Gew.-Teilen, bezogen auf 100 Gew.-Teile Kunstharz, angewendet wird. Diese Komponente verbessert die Überzugseigenschaften nach vorausgegangenen Glühoperationen und ermöglicht andererseits, das rheologische Verhalten der Zubereitung und des feuchten Films zu beeinflussen.According to a further embodiment of the invention, the aqueous preparation contains pyrogenic silica which preferably in amounts of 0.1 to 40 parts by weight, based on 100 parts by weight of synthetic resin. This component improves the coating properties after previous annealing operations and, on the other hand, enables the rheological behavior of the preparation and the moist film to be influenced.
Zur Optimierung der Netz- und Verlaufseigenschaften der Zubereitung werden in ihr vorzugsweise Tenside mitverwendet. Hierbei hat sich die Dosiervorschrift 0,1 bis 10, insbesondere 0,2 bis 3 Gew.-Teile, Tensid auf 100 Gew.-Teile Kunstharz als günstig erwiesen. Mit besonderem Vorteil werden hierfür oberflächenaktive Ethinverbindungen, z.B. tertiärer Ethinglykol, eingesetzt, da sie eine günstige Kombination von Netz-, Dispergier- und Antischaumeigenschaften bieten.To optimize the wetting and flow properties of the preparation, surfactants are preferably used in it. Here, the dosing instructions 0.1 to 10, in particular 0.2 to 3 parts by weight of surfactant per 100 parts by weight of synthetic resin have proven to be favorable. For this purpose, surface-active ethyne compounds, e.g. tertiary Ethinglykol, used because they offer a favorable combination of wetting, dispersing and anti-foam properties.
Schließlich hat es sich als vorteilhaft erwiesen, den Zubereitungen Entschäumer, z.B. in Mengen von 0,1 bis 10, vorzugsweise 0,2 bis 4, Gew.-Teilen, bezogen auf 100 Gew.-Teile Kunstharz, zuzusetzen. Wäßrige Behandlungsflüssigkeiten besitzen oft die Eigenschaft, unter Einwirkung von Scherkräften Luftblasen einzuemulgieren. Diesem Effekt kann durch die Mitverwendung von Entschäumern, vorzugsweise auf Basis von Kohlenwasserstoffen, oxethylierten Verbindungen und siliziumhaltigen Komponenten, entgegengewirkt werden.Finally, it has proven advantageous to add defoamers, e.g. in amounts of 0.1 to 10, preferably 0.2 to 4, parts by weight, based on 100 parts by weight of synthetic resin. Aqueous treatment liquids often have the property of emulsifying air bubbles under the action of shear forces. This effect can be counteracted by the use of defoamers, preferably based on hydrocarbons, oxyethylated compounds and silicon-containing components.
Die erfindungsgemäße Zubereitung wird üblicherweise mit einem Trockenrückstand von 10 bis 80 Gew.-%, Rest Wasser, eingesetzt. Ihr Auftrag auf die Metalloberfläche kann mit allen aus der Lackiertechnik bekannten Methoden, z.B. Tauchen, Spritzen, Fluten, Gießen, Streichen und Walzen, erfolgen. Bei der Beschichtung von Blech in Band- und Tafelform findet jedoch bevorzugt der Walzenauftrag Anwendung.The preparation according to the invention is usually used with a dry residue of 10 to 80% by weight, the rest water. You can apply it to the metal surface using all methods known from painting technology, e.g. Dipping, spraying, flooding, pouring, painting and rolling take place. When coating sheet metal in strip and sheet form, however, roller application is preferred.
Das Erhitzen des feuchten Films zu seiner Trocknung und Formierung erfolgt ebenfalls in den aus der Lackiertechnik bekannten Einrichtungen.The moist film is also heated in order to dry and form it in the facilities known from painting technology.
Wegen der großen Bedeutung des erfindungsgemäßen Verfahrens für die Isolation von Band wird auf dieses Anwendungsgebiet im Folgenden ausführlicher eingegangen:Because of the great importance of the method according to the invention for the isolation of tape, this field of application is discussed in more detail below:
Die Schichtdicke des auf das Band applizierten feuchten Filmes der Behandlungsflüssigkeit und die daraus nach der Trocknung resultierende Schichtdicke der Isolationsschicht hängt insbesondere von dem in der Behandlungsflüssigkeit enthaltenen Trockenrückstand, der quantitativen Förderung der Behandlungsflüssigkeit durch die Walzenkombination des Lackierstuhles, insbesondere von dem Anpreßdruck der einzelnen Walzen gegeneinander, der Drehgeschwindigkeit der Applikationswalze im Verhältnis zur Geschwindigkeit der Stahlbänder, ab.The layer thickness of the moist film of the treatment liquid applied to the belt and the resulting layer thickness of the insulation layer after drying depends in particular on the dry residue contained in the treatment liquid, the quantitative promotion of the treatment liquid by the roller combination of the coating chair, in particular on the contact pressure of the individual rollers against one another , the speed of rotation of the application roller in relation to the speed of the steel belts.
Bei Bandbeschichtungsverfahren kann beispielsweise die Beschichtung bei einer Bandgeschwindigkeit bis ca. 120 m/min und mehr erfolgen. Die anschließende Auftrocknung der Schicht geschieht bei 120 bis 350°C (Objekttemperatur) zweckmäßigerweise im Durchlaufofen während 1 Stunde bis 5 sec. Dabei gilt für niedrige Temperaturen die längere und für höhere Temperaturen die kürzere Zeit. Als Richtwert gilt etwa eine Verweilzeit im Ofen von 20 sec bei 300°C.In the case of coil coating processes, for example, coating can take place at a belt speed of up to approximately 120 m / min and more. The subsequent drying of the layer takes place at 120 to 350 ° C (object temperature), expediently in a continuous oven for 1 hour to 5 seconds. The longer time applies for low temperatures and the shorter time for higher temperatures. As a guideline, a residence time in the oven of 20 seconds at 300 ° C applies.
Die Bänder können einseitig und/oder beidseitig mit Hilfe des vorgenannten Beschichtungssystems mit der genannten Behandlungsflüssigkeit in Kontakt gebracht werden.The strips can be brought into contact with the treatment liquid mentioned on one side and / or on both sides with the aid of the aforementioned coating system.
Je nach Anwendungsfall werden die isolierten Bänder als Breitband und/oder mit Hilfe von Spaltanlagen, in Längsrichtung zerteilt, weiterverarbeitet. Bei der Herstellung von Spaltbändern bzw. Schmalbändern ist die besonders gute Haftfestigkeit sowie die Elastizität der aus der beschriebenen Behandlungsflüssigkeit resultierenden Isolationsschicht von Vorteil. Ein Abblättern der Isolierschicht würde zur Beschädigung der noch verbleibenden isolierten Fläche der Bänder führen.Depending on the application, the insulated tapes are further processed as broadband and / or split in the longitudinal direction with the aid of splitting systems. In the production of split strips or narrow strips, the particularly good adhesive strength and the elasticity of the insulation layer resulting from the treatment liquid described are advantageous. Peeling off the insulating layer would damage the remaining insulated surface of the tapes.
Weiterhin ist die besonders gute Resistenz der beschriebenen Isolationsschicht gegen Korrosion während der Lagerung in Räumen mit besonders hoher Luftfeuchtigkeit vorteilhaft. Die Isolationsschicht verleiht dem Blech einen ausgezeichneten Schutz gegen Korrosion.Furthermore, the particularly good resistance of the insulation layer described to corrosion during storage in rooms with particularly high atmospheric humidity is advantageous. The insulation layer gives the sheet excellent protection against corrosion.
Aus den isolierten Bändern werden durch Stanzvorgänge Teile der unterschiedlichsten Geometrien gefertigt. Bei diesem Vorgang wirkt die beschriebene Isolationsschicht besonders vorteilhaft auf die Gleitfähigkeit der Stanzwerkzeuge. Dadurch wird der Verschleiß der Werkzeuge in erheblichem Maße verringert. Das bedeutet, die Zeiträume, nach denen ein Nachschärfen der Werkzeuge unumgänglich ist, werden entscheidend verlängert.Parts of a wide variety of geometries are produced from the insulated strips using punching processes. During this process, the insulation layer described has a particularly advantageous effect on the lubricity of the punching tools. This significantly reduces tool wear. This means that the periods of time after which the tools have to be resharpened are decisively extended.
Während des Stanzvorganges ist die gute Haftfestigkeit der Isolationsschicht zum Blech sowie die gute Flexibilität von besonderem Vorteil, damit kein Abblättern sowie Stauben der Isolationsschicht diesen Arbeitsgang stört und die isolierende Eigenschaft durch die genannten Vorgänge vermindert werden.During the punching process there is good adhesion of the insulation layer to the sheet metal as well as good flexibility Of particular advantage, so that no peeling or dusting of the insulation layer interferes with this operation and the insulating properties are reduced by the above-mentioned processes.
Nach dem Stanzvorgang werden die Stanzteile gestapelt und vielfach an deren Seite verschweißt. Hierbei ist es von besonderem Vorteil, daß dieser Schweißvorgang durch die besondere Zusammensetzung der Isolationsschicht eine Schweißgeschwindigkeit von mehr als 1500 mm/min ohne Poren und/oder Lunkerbildung ermöglicht.After the stamping process, the stamped parts are stacked and often welded to their sides. It is particularly advantageous here that this welding process, due to the special composition of the insulation layer, enables a welding speed of more than 1500 mm / min without pores and / or void formation.
Das erfindungsgemäße Verfahren bietet u.a.
- eine hervorragende Isolation der Metalloberflächen gegen den Durchtritt elektrischer Ströme
- eine gute Stanzbarkeit der isolierten Bleche
- einen reduzierten Verschleiß der Stanzwerkzeuge
- eine gute Haftung der Überzüge während und nach mechanischer Beanspruchung
- eine hervorragende Schweißfähigkeit der mit dem Überzug versehenen und gestapelten Stanzabschnitte
- eine ausgezeichnete Haftung der nach einer Temperaturbeanspruchung zwischen 500 und 850°C verbleibenden Überzüge
- Abwesenheit toxischer Bestandteile.The method according to the invention offers, inter alia
- Excellent insulation of the metal surfaces against the passage of electrical currents
- good punchability of the insulated sheets
- reduced wear of the punching tools
- good adhesion of the coatings during and after mechanical stress
- Excellent weldability of the stamped sections provided with the coating and stacked
- Excellent adhesion of the coatings remaining after a temperature stress between 500 and 850 ° C
- absence of toxic components.
Weiterhin wird, bedingt durch die besondere Zusammensetzung der Isolationsschicht, eine mögliche Rußbildung, wie sie beim Verbrennen von organischen Isolationsanteilen entstehen kann, verhindert. Durch die speziellen Eigenschaften der Isolationsschicht wird ferner die Standzeit der Schweißelektroden im Vergleich zu üblichen Isolationen organischer Natur erheblich verlängert. Unter Standzeit der Elektroden versteht man die Arbeitszeit, nach der ein erneutes Anspitzen sowie Justieren der Elektrode unumgänglich ist.Furthermore, due to the special composition of the insulation layer, possible soot formation, which can occur when organic insulation components are burned, is prevented. Due to the special properties of the insulation layer The service life of the welding electrodes is considerably longer than that of conventional organic insulation. The standing time of the electrodes is the working time after which a renewed sharpening and adjustment of the electrode is essential.
Ein besonderer Vorteil der Erfindung besteht darin, daß auch bei sehr geringen Schichtdicken ein hervorragender elektrischer Oberflächenwiderstand der Bleche erzielt wird.A particular advantage of the invention is that an excellent electrical surface resistance of the sheets is achieved even with very small layer thicknesses.
Durch die Eigenschaft der beschriebenen Isolation, nach dem Entspannungsglühen festhaftende Schichten aus Oxid und/oder Verbrennungsrückständen zu bilden, ist die besonders gute elektrische Isolation nach dem genannten Vorgang von besonderem Vorteil.Due to the property of the insulation described, after the stress relief annealing, to form firmly adhering layers of oxide and / or combustion residues, the particularly good electrical insulation after the above-mentioned process is of particular advantage.
Die bevorzugt vorgesehene Arbeitsweise mit Freiheit der Behandlungsflüssigkeit von Chromverbindungen, insbesondere von Chromatverbindungen, sowie organischem Lösungsmittel hat zudem den Vorteil, daß eine Beeinträchtigung der Umwelt vermieden wird und auf besondere Vorsichtsmaßnahmen bei der Bandbehandlung verzichtet werden kann.The preferred method of working with freedom of the treatment liquid from chromium compounds, in particular from chromate compounds, and organic solvents also has the advantage that environmental damage is avoided and special precautionary measures during strip treatment can be dispensed with.
Die Erfindung wird anhand der Beispiele beispielsweise und näher erläutert.The invention is illustrated by way of example and in more detail.
100 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (SZ: ca. 100; MG: ca. 10 000) wurden mit 8 Gew.-Teilen eines mikronisierten Polyethylenwachses, 12,0 Gew.-Teilen Copolymerisat von Methylmethacrylat/Acrylnitril in Kugelform (mittlerer Teilchendurchmesser 10 µm), 7 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇.10H₂O), 8,0 Gew.-Teilen eines Alkanolamins, 6,5 Gew.-Teilen pyrogener Kieselsäure, 2,5 Gew.-Teilen eines Gemisches aus Stoffen mit grenzflächenaktiven Eigenschaften, bestehend aus Ethinglykol, Kohlenwasserstoffen, oxethylierten Verbindungen und siliciumhaltigen Komponenten, und 170 Gew.-Teilen vollentsalztem Wasser gemischt.100 parts by weight of an alkylphenol-modified polyester resin (SZ: approx. 100; MW: approx. 10,000) were mixed with 8 parts by weight of a micronized polyethylene wax, 12.0 Part by weight of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 10 microns), 7 parts by weight of sodium borate (calculated as Na₂B₄O₇.10H₂O), 8.0 parts by weight of an alkanolamine, 6.5 parts by weight of pyrogenic Silicic acid, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of deionized water.
Diese Zubereitung wurde auf die Oberfläche eines Si-legierten Elektro-Stahlbleches mit einer Nenndicke von 0,5 mm (Sorte V 700-50 A nach DIN 46400 Teil 1) mit Hilfe einer Gummiwalze beidseitig aufgetragen. Zur Auftrocknung der Beschichtung erfolgte anschließend eine Behandlung der beschichteten Bleche bei einer Temperatur von 300°C innerhalb eines Zeitraumes von 20 sec. Die durchschnittliche Trockenschichtdicke betrug 1 µm ± 0,5 µm.This preparation was applied to the surface of a Si-alloyed electrical steel sheet with a nominal thickness of 0.5 mm (grade V 700-50 A according to DIN 46400 Part 1) using a rubber roller on both sides. To dry the coating, the coated sheets were then treated at a temperature of 300 ° C. over a period of 20 seconds. The average dry layer thickness was 1 μm ± 0.5 μm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
Es wurde die gleiche Behandlungsflüssigkeit wie im Beispiel 1 mit einem Si-legierten Elektro-Stahlblech in Kontakt gebracht. Die Verarbeitung erfolgte ebenfalls unter den Bedingungen des Beispiels 1. Die durchschnittliche Trockenschichtdicke betrug 4 µm ± 0,5 µm.The same treatment liquid as in Example 1 was brought into contact with an Si-alloyed electrical steel sheet. Processing was also carried out under the conditions of Example 1. The average dry film thickness was 4 μm ± 0.5 μm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
Es wurden 45 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (wie im Beispiel 1) mit 25 Gew.-Teilen eines Acrlylatharzes, 30 Gew.-Teilen eines teilhydroximethylierten Melaminharzes, 8 Gew.-Teilen eines mikronisierten Polyethylenwachses, 12,0 Gew.-Teilen Copolymerisat von Methylmethacrylat/Acrylnitril in Kugelform (mittlerer Teilchendurchmesser 10 µm), 7,0 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇.10H₂O), 8,0 Gew.-Teilen eines Alkanolamins, 6,5 Gew.-Teilen pyrogener Kieselsäure, 2,5 Gew.-Teilen eines Gemisches aus Stoffen mit grenzflächenaktiven Eigenschaften, bestehend aus Ethinglykol, Kohlenwasserstoffen, oxethylierten Verbindungen und siliciumhaltigen Komponenten, und 170 Gew.-Teilen vollentsalztem Wasser gemischt.45 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were mixed with 25 parts by weight of an acrylic resin, 30 parts by weight of a partially hydroxymethylated melamine resin, 8 parts by weight of a micronized polyethylene wax, 12.0 parts by weight. Parts copolymer of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 10 microns), 7.0 parts by weight of sodium borate (calculated as Na₂B₄O₇.10H₂O), 8.0 parts by weight of an alkanolamine, 6.5 parts by weight of pyrogenic Silicic acid, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of deionized water.
Die Verarbeitung erfolgte ebenfalls unter den Bedingungen des Beispiels 1.Processing was also carried out under the conditions of Example 1.
Die durchschnittliche Trockenschichtdicke betrug 1,0 µm ± 0,5 µm.The average dry film thickness was 1.0 µm ± 0.5 µm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
100 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (siehe Beispiel 1) wurden mit 8,0 Gew.-Teilen mikronisierten Polyethylenwachses, 3,0 Gew.-Teilen Copolymerisat von Methylmethacrylat/Acrylnitril in Kugelform (mittlerer Teilchendurchmesser 10 µm), 9,0 Gew.-Teilen eines Schichtsilikates (mittlerer Teilchendurchmesser 10 µm), 7,0 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇.10H₂O), 8,0 Gew.-Teilen eines Alkanolamins, 6,5 Gew.-Teilen pyrogener Kieselsäure, 2,5 Gew.-Teilen eines Gemisches aus Stoffen mit grenzflächenaktiven Eigenschaften, bestehend aus Ethinglykol, Kohlenwasserstoffen, oxethylierten Verbindungen und siliciumhaltigen Komponenten, und 170 Gew.-Teilen vollentsalztem Wasser gemischt.100 parts by weight of an alkylphenol-modified polyester resin (see Example 1) were mixed with 8.0 parts by weight of micronized polyethylene wax, 3.0 parts by weight of copolymer of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 10 μm), 9. 0 parts by weight of a layered silicate (average particle diameter 10 µm), 7.0 parts by weight of sodium borate (calculated as Na₂B₄O₇.10H₂O), 8.0 parts by weight of an alkanolamine, 6.5 parts by weight of pyrogenic silica, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of fully deionized water.
Die Verarbeitung erfolgte ebenfalls unter den Bedingungen des Beispiels 1.Processing was also carried out under the conditions of Example 1.
Die durchschnittliche Trockenschichtdicke betrug 1,0 µm ± 0,5 µm.The average dry film thickness was 1.0 µm ± 0.5 µm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
100 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (wie im Beispiel 1) wurden mit 8 Gew.-Teilen eines mikronisierten Polyethylenwachses, 12,0 Gew.-Teilen eines Copolymerisats von Methylmethacrylat/Acrylnitril in Kugelform (mittlerer Teilchendurchmesser 12 µm), 20 Gew.-Teilen Aluminiumfluorid (berechnet als AlF₃.3H₂O), 7 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇ 10H₂O, 14 Gew.-Teilen Dimethylethanolamin und 115 Gew.-Teilen vollentsalztem Wasser gemischt.100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8 Parts by weight of a micronized polyethylene wax, 12.0 parts by weight of a copolymer of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 12 microns), 20 parts by weight of aluminum fluoride (calculated as AlF₃.3H₂O), 7 parts by weight of sodium borate (calculated as Na₂B₄O₇ 10H₂O, 14 parts by weight of dimethylethanolamine and 115 parts by weight of demineralized water mixed.
Die Verarbeitung erfolgte unter den Bedingungen des Beispiels 1.Processing was carried out under the conditions of Example 1.
Die durchschnittliche Trockenschichtdicke betrug 1,0 µm ± 0,5 µm.The average dry film thickness was 1.0 µm ± 0.5 µm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
100 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (wie im Beispiel 1) wurden mit 8,0 Gew.-Teilen eines mikronisierten Polyethylenwachses, 7,0 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇.10H₂O), 8,0 Gew.-Teiles eines Alkanolamins, 2,5 Gew.-Teilen eines Gemisches aus Stoffen mit grenzflächenaktiven Eigenschaften, bestehend aus Ethinglykol, Kohlenwasserstoffen, oxethylierten Verbindungen und siliciumhaltigen Komponenten, und 170 Gew.-Teilen vollentsalztem Wasser gemischt.100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8.0 parts by weight of a micronized polyethylene wax, 7.0 parts by weight of sodium borate (calculated as Na₂B₄O₇.10H₂O), 8.0 parts by weight. - Part of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of Ethinglykol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of demineralized water.
Die Verarbeitung erfolgte ebenfalls unter den Bedingungen des Beispiels 1.Processing was also carried out under the conditions of Example 1.
Die durchschnittliche Trockenschichtdicke betrug 1,0 µm ± 0,5 µm.The average dry film thickness was 1.0 µm ± 0.5 µm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
100 Gew.-Teile eines Alkylphenol-modifizierten Polyesterharzes (wie im Beispiel 1) wurden mit 8,0 Gew.-Teilen eines mikronisierten Polyethylenwachses, 20 Gew.-Teilen Aluminiumfluorid (berechnet als AlF₃.3H₂O), 7,0 Gew.-Teilen Natriumborat (berechnet als Na₂B₄O₇.10H₂O), 15 Gew.-Teilen eines Alkanolamins, 2,5 Gew.-Teilen eines Gemisches aus Stoffen mit grenzflächenaktiven Eigenschaften, bestehend aus Ethinglykol, Kohlenwasserstoffen, oxethylierten Verbindungen und siliciumhaltigen Komponenten, und 170 Gew.-Teilen vollentsalztem Wasser gemischt.100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were with 8.0 parts by weight of a micronized polyethylene wax, 20 parts by weight of aluminum fluoride (calculated as AlF₃.3H₂O), 7.0 parts by weight Sodium borate (calculated as Na₂B₄O₇.10H₂O), 15 parts by weight of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ether glycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight demineralized water mixed.
Die Verarbeitung erfolgte ebenfalls unter den Bedingungen des Beispiels 1.Processing was also carried out under the conditions of Example 1.
Die durchschnittliche Trockenschichtdicke betrug 1,0 µm ± 0,5 µm.The average dry film thickness was 1.0 µm ± 0.5 µm.
Die Qualität der erzeugten Isolierschicht ergibt sich aus der nachfolgenden Tabelle.The quality of the insulation layer produced is shown in the table below.
Die nachfolgende Tabelle enthält die mit den einzelnen Beispielen erzielten Ergebnisse.The following table contains the results achieved with the individual examples.
Zeile 2 gibt die Stabilität der Behandlungsflüssigkeit nach einer Lagerzeit unter Normalbedingungen von mehr als 4 Wochen an. Visuell beurteilt wurde die Homogenität der Behandlungsflüssigkeit. Weiterhin wurde die Viskosität nach DIN 53211, 4 mm B sofort nach der Herstellung bestimmt. Dieser Wert wurde nach einer Lagerzeit der Behandlungsflüssigkeit von mehr als 4 Wochen mit dem danach gemessenen Wert verglichen.Line 2 shows the stability of the treatment liquid after a storage period under normal conditions of more than 4 weeks. The homogeneity of the treatment liquid was assessed visually. Furthermore, the viscosity was determined according to DIN 53211, 4 mm B immediately after production. This value was compared with the value measured after a storage period of the treatment liquid of more than 4 weeks.
Zeile 3 gibt die Trockenschichtdicke der aus den Behandlungsflüssigkeiten resultierenden Isolationsschichten an, unter denen die Prüfergebnisse ermittelt wurden. Es handelt sich um einen Durchschnittswert von 20 bis 50 Einzelmessungen.Line 3 specifies the dry layer thickness of the insulation layers resulting from the treatment liquids, under which the test results were determined. It is an average of 20 to 50 individual measurements.
In Zeile 4 ist der interlaminare Übergangswiderstand in Ohm . cm² bei einem Anpreßdruck von 100 N/cm² einer Elektrodenfläche von 4 cm und einer Spannung von 100 mV für die doppelte, auf dem Elektroblech befindliche Isolierschicht vor dem Glühen angegeben. Die Beurteilung mit R 50 bedeutet, daß 50 % der Meßwerte über dem angegebenen Widerstandswert liegen.In line 4 is the interlaminar contact resistance in ohms. cm² at a contact pressure of 100 N / cm² an electrode area of 4 cm and a voltage of 100 mV for the double insulating layer on the electrical sheet before annealing. The evaluation with R 50 means that 50% of the measured values are above the specified resistance value.
In Zeile 5 ist der Übergangswiderstand wie für Zeile 4 erläutert, jedoch nach dem Glühen der Isolationsschicht während einer Stunde bei 600°C in Luft.In line 5, the contact resistance is as explained for line 4, but after annealing the insulation layer for one hour at 600 ° C in air.
Das Haftvermögen, das gleichzeitig auch eine Aussage über das Dehnvermögen der Schicht beinhaltet, gemäß Zeile 6 wurde durch Biegeversuche um den konischen Dorn ermittelt.The adherence, which also includes a statement about the stretchability of the layer, according to line 6 was determined by bending tests around the conical mandrel.
In Zeile 7 ist die Fläche angegeben, die nach der Glühung während einer Stunde bei 600°C in Luft durch Aufbringen und Abreißen von einem Klebeband noch als festhaftende Isolation die Oberfläche des Stahlbleches bedeckt.Line 7 shows the area which after annealing for one hour at 600 ° C in air by applying and tearing off an adhesive tape still covers the surface of the steel sheet as firmly adhering insulation.
In Zeile 8 ist die korrosionsschützende Eigenschaft der Isolationsschicht auf Stahlblechen genannt. Die Bestimmung erfolgte durch den Klimawechseltest gemäß DIN 50017, bei dem das beschichtete Blech zunächst 8 Stunden einer Atmosphäre von 40°C und 100 % relativer Luftfeuchtigkeit und anschließend 16 Stunden normalem Raumklima ausgesetzt wurde.Line 8 lists the corrosion-protecting properties of the insulation layer on steel sheets. The determination was carried out by the climate change test in accordance with DIN 50017, in which the coated sheet metal was first exposed to an atmosphere of 40 ° C. and 100% relative atmospheric humidity for 8 hours and then to a normal room climate for 16 hours.
Beim Gitterschnitt gemäß Zeile 9 werden durch bis auf die Metalloberfläche gehende Kreuzschnitte 1 mm² große Felder geschaffen. Durch Aufbringen und Abreißen von einem Klebeband werden dann die beschädigten bzw. abgelösten Felder ermittelt. Diese Bestimmung wurde nach DIN 53151 durchgeführt.In the cross-cut according to line 9, cross cuts up to the metal surface create 1 mm² fields. The damaged or detached fields are then determined by applying and tearing off an adhesive tape. This determination was carried out in accordance with DIN 53151.
Zur Ermittlung der Lösemittelbeständigkeit gemäß Zeile 10 wurde ein mit Methylenchlorid (CH₂Cl₂) getränkter Wattebausch 50 x über eine bestimmte Stelle der Isolierschicht geführt und eine eventuelle Veränderung bewertet.To determine the solvent resistance according to line 10, a cotton ball soaked with methylene chloride (CH₂Cl₂) was passed 50 x over a certain point on the insulating layer and any change was assessed.
Zeile 11 gibt die zulässige Geschwindigkeit an, mit der bei einem Preßdruck des Blechstapels von 250 N/cm² und einer Stromstärke von 90 bis 120 A unter Argonatmosphäre eine einwandfreie, porenfreie Schweißnaht gezogen werden kann.Line 11 specifies the permissible speed at which the sheet stack is pressed at a pressure of 250 N / cm² and a current of 90 to 120 A under an argon atmosphere, a flawless, non-porous weld can be drawn.
Zeile 12 beschreibt den Anteil einer Rußentwicklung, wie sie beim Verbrennen von organischen Stoffen vorkommen kann, der sich an den Rändern der Schweißnähe niederschlägt.Line 12 describes the proportion of soot development, which can occur when organic substances are burned, and which is deposited on the edges of the weld.
In Zeile 13 wird die Stabilität der Schweißelektrode beim Verschweißen der isolierten und gestapelten Stanzteile angegeben. Die Angaben enthalten indirekt auch eine Aussage über die mögliche Länge der erzielbaren Schweißstrecke, ohne daß ein Nachschleifen und/oder Nachjustieren der Elektrode notwendig ist.Line 13 shows the stability of the welding electrode when welding the insulated and stacked stamped parts. The information indirectly also contains a statement about the possible length of the achievable welding path, without regrinding and / or readjusting the electrode being necessary.
Wie sich aus der Tabelle ergibt, sind die Ergebnisse bezüglich Übergangswiderstand vor und nach dem Glühen (Zeilen 4 und 5), Haftvermögen vor und nach dem Glühen (Zeilen 6 und 7), Gitterschnitt (Zeile 9), Beständigkeit gegen organisches Lösungsmittel (Zeile 10) übereinstimmend gut. Gegenüber den Vergleichsbeispielen 1 und 3 zeigen die Beispiele 1 bis 4 eine hervorragende Stabilität der Behandlungsflüssigkeiten bezüglich Homogenität und Viskosität (Zeile 2) sowie Korrosionsbeständigkeit (Zeile 8).As can be seen from the table, the results are with respect to contact resistance before and after annealing (lines 4 and 5), adhesion before and after annealing (lines 6 and 7), cross hatch (line 9), resistance to organic solvents (line 10 ) consistently good. Compared to comparative examples 1 and 3, examples 1 to 4 show excellent stability of the treatment liquids with regard to homogeneity and viscosity (line 2) and corrosion resistance (line 8).
In Zeile 11 ist durch die Beispiele 1, 3 und 4 eine ausgezeichnete Schweißgeschwindigkeit dokumentiert, bei der porenfreie Schweißnähte gezogen werden können. Das Beispiel 2 zeigt, daß bei einer Dicke der Isolationsschicht von 4 µm ± 0,5 µm noch eine hohe Schweißgeschwindigkeit mit porenfreier Schweißnaht resultiert im Vergleich zu den Vergleichsbeispielen 2 und 3. Das Vergleichsbeispiel 1 zeigt vergleichweise zu Beispiel 2 eine hohe Schweißgeschwindigkeit, jedoch ist diese nur bei sehr dünnen Isolationsdicken von 1 µm ± 0,5 µm zu erreichen. Das Vergleichsbeispiel 1 zeigt weiterhin bezüglich Stabilität der Behandlungsflüssigkeit sowie Korrosionsschutz weitere entscheidende Nachteile im Vergleich zu den Beispielen 1 bis 4.In line 11 examples 1, 3 and 4 document an excellent welding speed at which non-porous weld seams can be drawn. Example 2 shows that with a thickness of the insulation layer of 4 µm ± 0.5 µm a high one Welding speed with a non-porous weld results in comparison to Comparative Examples 2 and 3. Comparative Example 1 shows a high welding speed compared to Example 2, but this can only be achieved with very thin insulation thicknesses of 1 µm ± 0.5 µm. Comparative example 1 also shows further decisive disadvantages in comparison with examples 1 to 4 with regard to the stability of the treatment liquid and corrosion protection.
Die Rußentwicklung (Zeile 12) ist in den Vergleichsbeispielen 2 und 3 sehr groß gegenüber den Beispielen 1 bis 4. Ebenso ist die Elektrodenstabilität der Vergleichsbeispiele 2 und 3 sehr gering im Vergleich zu den Beispielen 1 bis 4. Bezüglich der Schweißbarkeit zeigt die Tabelle, daß im Vergleich insbesondere gegenüber den Vergleichsbeispielen 2 und 3 die Erfindung einen besonderen Vorteil bietet.The development of soot (line 12) in comparative examples 2 and 3 is very high compared to examples 1 to 4. Likewise, the electrode stability of comparative examples 2 and 3 is very low in comparison with examples 1 to 4. With regard to weldability, the table shows that in comparison, in particular compared to comparative examples 2 and 3, the invention offers a particular advantage.
Die Ergebnisse der Beispiele 1 bis 4 zeigen, daß im Unterschied zu den Vergleichsbeispielen 1 bis 3 die Erfindung sämtliche guten Eigenschaften, wie sie für elektrisch isolierende Schichten auf Stahlblechen zur Herstellung von Magnetkernen wünschenswert sind, in sich vereint.
Claims (14)
a) mit Wasser verdünnbares Kunstharz
b) dispergierte, wachsartige Substanz mit einer Partikelgröße von 0,1 bis 20 µm und einem Schmelzpunkt von 80 bis 250°C
c) anorganisches und/oder organisches Pigment
d) Borat
e) Alkalihydroxid und/oder Ammoniak und/oder organisches Amin zur Einstellung eines pH-Wertes von 7 bis 9
enthält und frei von Fluorid ist, in einer Menge von 0,5 bis 20 g/m² (ber. als Trockensubstanz) aufträgt und den feuchten Film anschließend bei 120 bis 350°C (Objekttemperatur) 1 Stunde bis 5 sec auftrocknet.1. A method for producing electrically insulating coatings on metal surfaces, characterized in that an aqueous preparation on the metal surface
a) water-thinnable synthetic resin
b) dispersed, waxy substance with a particle size of 0.1 to 20 microns and a melting point of 80 to 250 ° C.
c) inorganic and / or organic pigment
d) borate
e) alkali metal hydroxide and / or ammonia and / or organic amine to adjust a pH from 7 to 9
contains and is free of fluoride, in an amount of 0.5 to 20 g / m² (calculated as dry substance) and then dries the moist film at 120 to 350 ° C (object temperature) for 1 hour to 5 seconds.
0,1 bis 40 Gew.-Teile dispergierte wachsartige Substanz
1 bis 60 Gew.-Teile anorganisches und/oder organisches Pigment
0,1 bis 40 Gew.-Teile Borat und
0,1 bis 20 Gew.-Teile organisches Amin.
10. The method according to one or more of claims 1 to 9, characterized in that an aqueous preparation is applied to the metal surface, which contains the components in the following amounts, based on 100 parts by weight of synthetic resin:
0.1 to 40 parts by weight of dispersed waxy substance
1 to 60 parts by weight of inorganic and / or organic pigment
0.1 to 40 parts by weight of borate and
0.1 to 20 parts by weight of organic amine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873720217 DE3720217A1 (en) | 1987-06-17 | 1987-06-17 | METHOD FOR PRODUCING ELECTRICALLY INSULATING COATINGS ON METAL SURFACES |
| DE3720217 | 1987-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0298277A1 true EP0298277A1 (en) | 1989-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88109337A Ceased EP0298277A1 (en) | 1987-06-17 | 1988-06-11 | Method for producing electric insulating coatings on surfaces of metals |
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| Country | Link |
|---|---|
| US (1) | US4942061A (en) |
| EP (1) | EP0298277A1 (en) |
| JP (1) | JPH02500448A (en) |
| KR (1) | KR900000132A (en) |
| AU (1) | AU607785B2 (en) |
| DD (1) | DD284776A5 (en) |
| DE (1) | DE3720217A1 (en) |
| IN (1) | IN169533B (en) |
| WO (1) | WO1988010288A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1291451A1 (en) * | 2001-04-12 | 2003-03-12 | Kawasaki Steel Corporation | Electrical sheet having insulating coating and insulating coating |
| CN109663729A (en) * | 2018-12-28 | 2019-04-23 | 南通苏源恒炫电气有限公司 | Solid-state insulated switchgear insulated case coats layer process |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3330045B2 (en) * | 1996-03-01 | 2002-09-30 | 日産自動車株式会社 | Surface treatment method for screw parts |
| US6395336B1 (en) * | 1998-01-14 | 2002-05-28 | Henkel Corporation | Process for improving the corrosion resistance of a metal surface |
| JP3736958B2 (en) * | 1998-01-14 | 2006-01-18 | 日本パーカライジング株式会社 | Corrosion-resistant coating method for metal surfaces |
| GB2338115B (en) * | 1998-04-14 | 2002-08-07 | Gec Alsthom Ltd | Improvements in or relating to rotor cores for electrical rotating machines |
| US6764765B2 (en) | 1998-05-19 | 2004-07-20 | Sony Chemicals Corporation | Fire-retardant adhesive, fire-retardant adhesive film using the same, and flat cable |
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| DE19851576A1 (en) * | 1998-11-09 | 2000-05-11 | Herberts Gmbh | Aqueous basecoats and their use for multi-layer painting |
| US6455100B1 (en) * | 1999-04-13 | 2002-09-24 | Elisha Technologies Co Llc | Coating compositions for electronic components and other metal surfaces, and methods for making and using the compositions |
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| US10403440B2 (en) | 2016-12-02 | 2019-09-03 | Carver Scientific, Inc. | Capacitive energy storage device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1246071B (en) * | 1961-02-20 | 1967-08-03 | R W Moll & Co | Use of aqueous dispersions of plastics or of natural products similar to plastics to form electrically separating coatings on electrical sheets |
| WO1985000496A2 (en) * | 1983-11-22 | 1985-02-14 | Udviklingsselskabet Af 31.10.1983 Aps | Paint |
| EP0209940A1 (en) * | 1985-07-17 | 1987-01-28 | Stahlwerke Bochum AG | Process for applying an insulating layer |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3231462A (en) * | 1961-05-03 | 1966-01-25 | Sun Oil Co | Wax-coated paper |
| GB1276303A (en) * | 1968-11-20 | 1972-06-01 | Rolls Royce | Improvements in coating metals |
| IT1088022B (en) * | 1977-10-24 | 1985-06-04 | Moplefan Spa | POLYOLEFINIC FILMS COATED WITH LOW ADHESION TO THE SEALING BARS |
| JPS56113383A (en) * | 1980-02-12 | 1981-09-07 | Toyo Kohan Co Ltd | Production of metal article coated with composite resin layer excellent in corrosion resistance |
| DE3038243A1 (en) * | 1980-10-10 | 1982-05-27 | Hoechst Ag, 6000 Frankfurt | METHOD FOR THE PRODUCTION OF HEAT-HARDENING, WATER-THINNABLE VARNISHES AND THE USE THEREOF FOR COATINGS |
| JPS57184475A (en) * | 1981-05-08 | 1982-11-13 | Ihara Chem Ind Co Ltd | Method of bonding urethane elastomer to metal |
| US4510199A (en) * | 1984-04-13 | 1985-04-09 | Westinghouse Electric Corp. | Release sheets for laminates with wax and alginate salt release layer |
-
1987
- 1987-06-17 DE DE19873720217 patent/DE3720217A1/en active Granted
-
1988
- 1988-06-11 JP JP63504673A patent/JPH02500448A/en active Pending
- 1988-06-11 US US07/306,021 patent/US4942061A/en not_active Expired - Fee Related
- 1988-06-11 AU AU19401/88A patent/AU607785B2/en not_active Ceased
- 1988-06-11 WO PCT/DE1988/000351 patent/WO1988010288A1/en unknown
- 1988-06-11 EP EP88109337A patent/EP0298277A1/en not_active Ceased
- 1988-06-16 DD DD88316840A patent/DD284776A5/en not_active IP Right Cessation
- 1988-06-17 IN IN498/CAL/88A patent/IN169533B/en unknown
-
1989
- 1989-05-23 KR KR1019890006911A patent/KR900000132A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1246071B (en) * | 1961-02-20 | 1967-08-03 | R W Moll & Co | Use of aqueous dispersions of plastics or of natural products similar to plastics to form electrically separating coatings on electrical sheets |
| WO1985000496A2 (en) * | 1983-11-22 | 1985-02-14 | Udviklingsselskabet Af 31.10.1983 Aps | Paint |
| EP0209940A1 (en) * | 1985-07-17 | 1987-01-28 | Stahlwerke Bochum AG | Process for applying an insulating layer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1291451A1 (en) * | 2001-04-12 | 2003-03-12 | Kawasaki Steel Corporation | Electrical sheet having insulating coating and insulating coating |
| EP1291451A4 (en) * | 2001-04-12 | 2008-12-24 | Jfe Steel Corp | Electrical sheet having insulating coating and insulating coating |
| CN109663729A (en) * | 2018-12-28 | 2019-04-23 | 南通苏源恒炫电气有限公司 | Solid-state insulated switchgear insulated case coats layer process |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1988010288A1 (en) | 1988-12-29 |
| IN169533B (en) | 1991-11-09 |
| US4942061A (en) | 1990-07-17 |
| AU1940188A (en) | 1989-01-19 |
| KR900000132A (en) | 1990-01-30 |
| DE3720217C2 (en) | 1992-02-27 |
| DD284776A5 (en) | 1990-11-21 |
| DE3720217A1 (en) | 1988-12-29 |
| AU607785B2 (en) | 1991-03-14 |
| JPH02500448A (en) | 1990-02-15 |
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