WO2009003937A1 - Composition de revêtement pulvérulente pour des revêtements résistants aux températures élevées - Google Patents

Composition de revêtement pulvérulente pour des revêtements résistants aux températures élevées Download PDF

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Publication number
WO2009003937A1
WO2009003937A1 PCT/EP2008/058260 EP2008058260W WO2009003937A1 WO 2009003937 A1 WO2009003937 A1 WO 2009003937A1 EP 2008058260 W EP2008058260 W EP 2008058260W WO 2009003937 A1 WO2009003937 A1 WO 2009003937A1
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WIPO (PCT)
Prior art keywords
powder coating
coating composition
resin
silicone
composition according
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PCT/EP2008/058260
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English (en)
Inventor
Richard Allman
Vishwaroop Sen
Nitesh Ranjan
Nirmalya Chakravorty
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Akzo Nobel Coatings International B.V.
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Application filed by Akzo Nobel Coatings International B.V. filed Critical Akzo Nobel Coatings International B.V.
Priority to CN200880023136A priority Critical patent/CN101720345A/zh
Publication of WO2009003937A1 publication Critical patent/WO2009003937A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe

Definitions

  • the present invention is directed to a powder coating composition that may be cured on a substrate to produce a coating that is resistant to high temperatures. More particularly, the present invention is directed to a powder coating composition comprising at least two distinct silicone resins.
  • WO2004/076572 (Dupont de Nemours and Company) purports to resolve this problem by including within the polysiloxane resin at least one matrix material, preferably low melting inorganic glass, that softens and exhibit some flow in the temperature range in which the polysiloxane resin undergoes shrinkage and embrittlement.
  • European Patent No. 0950695 B1 proposes an alternative solution in which the powder coating composition consists of a single silicone resin combined with titania and a filler of mica platelets and / or calcium metasilicate particles.
  • the single silicone resin is characterized by having siloxane functionality (Si-O-H) and only minor amounts of organic moieties. It is preferred in this citation that the single polysiloxane has a degree of substitution of less than 1.5 and an -OH content of between 2.0 and 7.5 wt.% based on the weight of said polysiloxane.
  • this powder coating composition may only be applied to substrates at a dry film thickness in the range from 1.8 to 2.2 mils (45 to 55 ⁇ m).
  • the substrates When powder coatings are applied to automotive bodies in order to protect and finish the engineered product, the substrates tend to be relatively thin and to have smooth surfaces. However, in the application of coatings to materials that are required to show high temperature resistance, it is more common for the substrate surfaces to be profiled or uneven: to provide adequate corrosion protection and an (aesthetic) finish to blast cleaned steel, for example, the substrate must be coated at a sufficient dry film thickness to compensate for surface unevenness. Blasting substrates with angular grit, rounded shot, abrasive loaded sponges or high pressure water jets can typically yield profiled surfaces that can exhibit "valley to peak" distances of between 10 and 80 ⁇ m (wherein said profiles may be defined by ISO 8503).
  • a powder coating composition comprising a resin component and a filler, wherein the resin component comprises a first silicone resin and a second silicone resin, said first and second silicone resins being characterized by having glass transition temperatures (T 9 ) that are different by at least 5°C.
  • a powder coating composition comprising a resin component and a filler, wherein the resin component comprises a first silicone resin and a second silicone resin, said first and second silicone resins being characterized by having melt viscosities, as measured at 140 0 C, that are different by at least 5 poise, preferablyl O poise.
  • the first and second silicone resins are present in resin component in a ratio by weight (First Silicone: Second Silicone Resin) of between 2:1 and 1 :2. Equally, it is preferred that said first silicone resin has a T 9 in the range from 40° to 50 0 C and said second silicone resin has a T 9 in the range from 55° to 80 0 C.
  • differences in the melt viscosity and / or T 9 of the first and second silicone resins can arise as a consequence of differences in the degree of branching of the polymers.
  • the more highly branched the polymer the greater the shrinkage observed at high temperatures.
  • first and second silicone polymers may be distinguished on the basis of their type and amount of constituent organic moieties and their -OH content (i.e. the degree of siloxane functionality).
  • the filler is a heat resistant material with one dimension at least four times larger than the other, said filler being present in an amount between 5 and 95 wt.% based on the weight of the resin component.
  • the resin component of the powder coating further comprises between 1 and 25 wt.%, based on the weight of the resin component, of a non-silicone resin.
  • said non-silicone resin is an epoxy-polyester hybrid.
  • the DFT of the cured powder coating layer is between 70 and 130 microns, preferably 75 and 100 microns.
  • a substrate coated with a cured layer of the powder coating composition as described above the layer having a DFT of at least 65 microns, preferably of between 70 and 130 microns and more preferably of between 75 and 100 microns.
  • the term "resin” includes any resin or polymer per se, as well as the curing agent.
  • the degree of substitution is herein defined as the average number of substituent organic groups per silicon atom and is the summation of the mole percent multiplied by the number of substituents for each ingredient. This calculation is further described in "Silicones in Protective Coatings", by Lawrence H. Brown (in Treatise on Coatings Vol. 1 , Part III, "Film-Forming Compositions” pp. 513-563, R. R. Meyers and J. S. Long eds. Marcel Dekker, Inc. New York, 1972).
  • the "glass transition temperature" or T 9 of any polymer may be calculated as described by Fox in Bull. Amer. Physics. Soc, 1 , 3, page 123 (1956).
  • the T 9 can also be measured experimentally using differential scanning calohmetry (at a rate of heating 20° C per minute, wherein the T 9 is taken at the midpoint of the inflection). Unless otherwise indicated, the stated T 9 as used herein refers to the calculated T 9 .
  • the normative term "high temperature” is used herein to indicate that the cured, powder coating compositions of the present invention are intended to withstand temperatures at which most organic components, including the organic moieties of the silicone resin, burn away. It is desirable that the cured, powder coatings of the present invention withstand temperatures of at least 550 0 C.
  • first and second silicone resins of the present invention are to be characterized by distinct T g 's and/or melt viscosity, these two silicone resins should both be solid at room temperature and both have a glass transition temperature (T 9 ) greater than 45°C. This lower limit of T 9 is necessary to prevent undue blocking (or sintering) of a coating powder.
  • the organic moieties of the first and second silicone resins are aryl and / or short chain (Ci to C 5 ) alkyl. It is known that for good heat resistance, methyl, ethyl and phenyl groups are desirable organic moieties, phenyl groups particularly so as the greater the number of phenyl groups the higher the heat resistance provided. Consequently, the first and second silicone resins compositions should preferably include methyl, ethyl, phenyl, dimethyl, diphenyl, methylphenyl and phenylpropyl organic moieties and their mixtures.
  • both silicone resins of the present invention comprise random mixtures of methyl and phenyl groups, dimethyl siloxane and diphenyl siloxane groups, or phenylmethylsiloxane groups, wherein the ratio of phenyl to methyl groups is 0.5 to 1.5:1 , more preferably 0.7:1 to 1.1 :1.
  • the first and second silicone resins have a degree of organic substitution of
  • the first and second silicone resins self-condense at high end-use temperatures which thus requires silanol functionality (Si — O — H).
  • Both silicone resins should have a condensable hydroxyl content of from 2 to 7 wt. %, more preferably from 3 to 5 wt. % but slight variations from these ranges may be tolerated depending on any catalyst present.
  • the condensable hydroxyl content should not be too high to prevent water outgassing during curing of the coating powder.
  • the lower limit of the condensable hydroxyl content range is important because below this the coating powder will cure too slowly to be suitable for commercial applications.
  • the first and second silicone resins of the present invention should preferably contain less than 0.2 wt.% of organic solvents, preferably less than 0.1 wt.%.
  • organic solvents preferably less than 0.1 wt.%.
  • most commercial silicone resins contain some residual organic solvent as a consequence of the process of silicone resin synthesis. Such organic solvent tends to be internally trapped within the silicone resin and is generally not removed when the silicone resin is melt blended with other components to form a coating powder composition. Accordingly, it may be necessary to substantially remove such residual organic solvent. This is accomplished by melting the silicone resin and removing solvent from the molten resin by sparging with an inert gas or by vacuum.
  • the first and second silicone resin according to the present invention are characterized by having distinct T g 's and / or distinct melt viscosities as measured at 150 0 C.
  • the differences in these properties may be achieved by employing silicone resins which are distinct in at least one of: the degree of polymeric branching; the type of organic moieties and the degree of substitution; and, the condensable hydroxyl content.
  • at least one silicone resin has viscosity of between 5 and 100 poise at 140° C, preferably between 20 and 50 poise in order to ensure that resin imparts appropriate melt-flow on the molten coating powder at the temperatures at which the coating powder is fused and cured.
  • at least one of said first and second silicone resins has a glass transition temperature (T 9 ) greater than 55°C, preferably greater than 60° C.
  • a particularly preferred first silicone resin which can be used without flaking is SILRES® 604 available from Wacker Chemie. This resin has a reactive hydroxyl content of between 3.5 and 7 %, a T 9 in the range of 55° to 80 0 C, and a melt viscosity at 140 0 C of 1.03 Pa. s, which corresponds to a melt viscosity at 140°C of 10.3 poise (1 Pa.s ⁇ 10 poise).
  • a particularly preferred second silicone resin which can also be used without flaking is DC-233 available from Dow Corning.
  • This resin has a reactive hydroxyl content of 6 %, a T 9 of 45°C and a melt viscosity at 140 0 C of 2.13 Pa. s, which corresponds to a melt viscosity at 140 0 C of 21.3 poise.
  • fillers are employed to reinforce silicone coatings.
  • suitable heat resistant fillers are characterized by having one dimension at least four times larger than another would provide useful reinforcement.
  • fillers comprising glass, metal fibers, metal flakes, mineral fibers, micas and calcium metasilicate, and which conform to this dimension requirement could therefore be included in the powder coating compositions of this invention.
  • the filler comprises fibres of an aluminium, silicon and magnesium mixed metal oxide.
  • these particular fibers are included in the powder coating composition in an amount between 20 and 60 wt.%, based on the weight of the resin component.
  • the filler may comprise a blend of these fibers with mica platelets.
  • composition may be prepared with and comprise a suitable dispersant.
  • the powder coating composition comprises between 0.5 and 2 wt.% of a dispersant, said dispersant preferably comprising polyvinyl butyral.
  • the powder coating compositions comprise from 1 to 25 wt.%, based on the weight of the resin component, of a non-silicone resin. It is further preferred that this non- silicone resin is an epoxy-polyester hybrid. As known in the art, polyester-epoxy hybrids comprise both epoxy resins and carboxyl terminated polyester resins and may also comprise a catalyst to drive the curing reaction. In this invention it is preferred that that the powder coating compositions are based on a mixture of such polyester and epoxy resins in polyester/epoxy ratio between 80/20 and 50/50.
  • Suitable polyester resins for use in said polyester-epoxy hybrids should have an acid number of less than 12, preferably less than 5. Said polyester resins should also be characterized by a hydroxyl number in the range from about 20 to about 50 mg KOH/g polymer.
  • the weight average molecular weight (M w ) of the polyester resin may range from about 1 ,000 to about 40,000, preferably between about 1 ,500 and about
  • the hydroxyl functionality of the resin i.e. the average number of hydroxyl groups present in each molecule of the resin, is 2 or more and preferably 2.2 or more, and more preferably 3.5 or more.
  • the upper limit of hydroxyl functionality, a molecular function should correspond to the upper limit of hydroxyl number, a molecular weight function.
  • the T 9 of the polyester resin be higher than 50° C, preferably higher than 55°C, in order to prevent blocking in a powder composition containing said polyester resin.
  • the polyester resins included with the powder coating composition of the present invention may be made from aromatic and/or saturated aliphatic acids and polyols using methods that are well established in this technical field.
  • the reactants may be heated - optionally in the presence of a catalyst such as p- toluene sulfonic acid - to a temperature in the range of from about 135°C to 220 0 C while being sparged with a stream of inert gas to remove water as it forms.
  • Vacuum or an azeotrope-forming solvent may be used at the appropriate temperature to assist the removal of water.
  • aliphatic polycarboxylic acids include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, diglycolic acid, 1 ,12-dodecanoic acid, tetrapropenyl succinic acid, maleic acid, fumaric acid, itaconic acid and malic acid.
  • aromatic polycarboxylic acids are phthalic acid and its anhydride, isophthalic acid, benzophenone dicarboxylic acid, diphenic acid, 4,4-dicarboxydiphenyl ether, 2,5-pyridine dicarboxylic acid and trimellitic acid.
  • suitable polyols are ethylene glycol, 1 ,3-propylene glycol, diethylene glycol, neopentyl glycol and trimethylolpropane. Mixtures the acids and of the polyols may be used.
  • polyesters useful in the powder coating composition of the present invention may comprise: P-1407 (Twin Hill); Uralac® P6505 (DSM); Morkote® 98HT (Rohm and Haas); Crylcoat® 820 (UCB); Alftalat® AN 745 (Solutia); Rucote® 625 (Bayer); and, Sparkle® SP400 (Sun Polymers).
  • Epoxy resins for use in the epoxy-polyester hybrids are exemplified by, but not limited to, those produced by the reaction of epichlorohydrin and a bisphenol, e.g., bisphenol A and bisphenol F.
  • the low melt viscosities of these resins facilitate the extrusion of them in admixture with other components of the powder coating at, preferably, below 200 0 C.
  • Suitable epoxy resins should also have a melt viscosity in the range from 2 to 20 poise at 150 0 C and preferably from 3 to 10 poise.
  • epoxy resins which are preferred for the purposes of this invention are the bisphenol A epoxies sold under the trademarks ARALDITE® GT-7004, GT-7071 , GT-7072, GT-6259 (Huntsman LLC) EPON® 1001 and 2042 (Shell Chemicals, Inc.).
  • the powder coating composition comprises from 1 to 50 wt.%, based on the weight of the composition, of at least one of zinc dust or zinc flakes.
  • zinc dust is added to improved the micro crack resistance, in particular when the coating is exposed to temperatures above the melting point of zinc (419°C).
  • the composition preferably further comprises zinc salts, such as zinc octoate, zinc acetylacetonate or zinc neodecanoate, in a total amount from 0.1 wt.% to 2.0 wt. %, based on the weight of the powder coating composition.
  • zinc salts such as zinc octoate, zinc acetylacetonate or zinc neodecanoate
  • These salts - or alternatives such as dibutyl tin dilaurate and stannous octoate - catalyze the auto-condensation of the silicone resins thereby reducing the gel time thereof.
  • Flow control and leveling additives may be present in the powder coating compositions in an amount between 2 and 10 wt.%, based on the weight of the composition.
  • Such flow control agents which enhance the compositions melt- flow properties and assist in eliminating surface defects, typically include acrylics and fluorine based polymers.
  • Examples of commercially available flow control agents include: Resiflow® P-67, Resiflow® P-200 and Clearflow® (all available from Estron Chemical Inc., Calvert City, KY); BYK® 361 and BYK® 300 from YK Chemie (Wallingford, CONN); and, Mondaflow® 2000 from Monsanto (St. Louis, MO).
  • the flow and leveling additives include acrylic resins, especially difunctional acrylic resins and more particularly acrylic resins having glycidyl and hydroxyl functionality and having an epoxide equivalent weight (EEW) of greater than 300, such as Fine Clad ® A 241 (available from Reichold Inc.).
  • EW epoxide equivalent weight
  • the composition may also comprise adhesion promoters in an amount between 0.1 and 1 wt. %, based on the total weight of the composition.
  • adhesion promoters are characterized by having pendant or free functional or polar groups - such as carboxyl, anhydride, hydroxyl, halogen, cyano, amido or sulphonate groups - or by having an inherent adherent property or by being of relatively small molecular size.
  • a polymeric adhesion promoter and suitable polymers include: Primacor ® 5990 (available from Dow Chemicals); Surlyn ® 1855 and Nucrel ® 403 or 410 (available from DuPont); Hyvis 30 (available from BP Chemicals); Lithene N4 6000 (available from Doverstrand Ltd); and, Soarnol D (EVAL resin available from British Trades & Shippers).
  • Degassing agents can also be used in the powder coating compositions of the present invention in an amount between 0.1 and 5 wt.%, based on the weight of the composition. Such degassing agents facilitate the release of gases during the curing process. Examples of commercially available degassing agents include: Benzoin available from Well Worth Medicines; and, Uraflow® B available from GCA Chemical Corporation (Brandenton, FLA).
  • the powder coating compositions may also preferably comprise a dry-flow additive in an amount from 0.05 to 1.0 wt.%, based on the total weight of the composition.
  • a dry-flow additive examples include fumed silica, aluminium oxide and mixtures thereof.
  • the powder coating compositions may comprise other conventional additives. These include: pigments; gloss-modifying additives; cratehng agents; cure agents; textuhzers; surfactants; biocides; and, organic plasticizers.
  • Colorants or pigments useful in the powders of the present invention may include carbon black, such as 9875 Black available from Engelhard Corporation (Ohio), metal flakes, and heat resistant pigments, such as the various iron oxide pigments and mixed metal oxide pigments.
  • the amount of colorant or pigment may range up to 20 parts per hundred resin by weight (phr), and preferably ranges from 0.1 to 15 phr, more preferably from 0.5 to 10 phr.
  • the powder coating compositions of the present invention which are solid particulate film-forming mixtures, are prepared by conventional manufacturing techniques used in the powder coating industry. Typically, the components of the powder coating composition will be dry blended together, melt mixed in an extruder at a temperature sufficient to melt the two constituent resins (preferably at temperatures below 200 0 C) and then extruded. The extrudate is then cooled to a solid, broken up and ground into a fine powder.
  • the powder coating compositions are most often applied by spraying, particularly electrostatic spraying, or by the use of a fluidized bed.
  • the powder coating compositions can be applied in a single sweep or in several passes to provide a film of the desired thickness after cure.
  • the powder coating compositions of this invention may be applied to a variety of substrates including metallic and non-metallic substrates.
  • the coated substrate is typically heated to a temperature between 120 0 C and 260°C for a period of 1 to 60 minutes to melt the composition, causing it to flow but also to cure to form a cross-linked matrix that is bound to the substrate.
  • the coated substrate is heated to a temperature between 200 0 C and 250°C for a period of 20 to 40 minutes.
  • the powder coating compositions may be at least partially melted and cured by application to a pre- heated substrate; depending on the degree of curing the powder may be further heated after application.
  • Silres-604 A hydroxyl-functional methylphenyl polysiloxane resin sold by Wacker Chemie. This resin has a reactive hydroxyl content of between 3.5 and 7 %, a Tg in the range of 55 to 80 0 C, and a melt viscosity at 140 0 C of of 10.3 poise.
  • DC233 A methlyphenyl silicone resin sold by Dow Corning. This resin has a reactive hydroxyl content of 6 %, a T 9 of 45°C and a melt viscosity at 140 0 C of 21.3 poise.
  • Araldite® GT-7004 Solid, medium molecular weight Epoxy resin based on Bisphenol A available from Hunstman LLC.
  • Lanco TF-1780 PTFE-modified polyethylene, micronized wax available from Lubhzol Advanced Materials, Inc. .
  • Resiflow® P-67 Flow control agent available from Estron Chemical Inc., Calvert City, KY
  • Fine Clad ® A 241 Acrylic resin having glycidyl and hydroxyl functionality and having an epoxide equivalent weight (EEW) of greater than 300 available from Reichold Inc.
  • Primacor ® 5990 Ethylene acrylic acid (EEA) copolymer available from Dow Chemicals.
  • Benzoin Degassing agent available from Well Worth Medicines 9875 Black: Carbon black colourant available from Engelhard Corporation, Ohio.
  • Zinc Dust Superfine grade available from Transpek Silox Industry Ltd.
  • Standart® AT Zinc flakes available from Eckart Effect Pigments.
  • Coatforce CF10 A synthetically engineered aluminium, magnesium and silicon mixed metal oxide provided by Lapinus Fibres.
  • mice 1240 A dry milled muscovite available from 20 Microns
  • Mowital B-3OH Polyvinyl butyral provided by Kuraray.
  • a powder coating was prepared by blending the components 1 to 13 provided in Table 1. Said blended material was then passed through a twin-screw extruder, which served to melt and further mix the materials. The extrudate was solidified by passing it between chilled rollers after which it fragmented into flakes. The flakes were then mixed with the additive (component 14) and ground through a mill. The resulting powder was passed through an 80-mesh sieve to remove coarse particles.
  • the powder coating composition of Table 1 was applied to the steel panels as a single coat using an electrostatic pistol to achieve a film thickness of between 70 and 100 ⁇ m.
  • the applied powder coating composition was cured by heating the substrate to 230 0 C and maintaining said temperature for 30 minutes.
  • a powder coating was prepared by blending the components 1 to 12 provided in Table 3. Said blended material was then passed through a twin-screw extruder, which served to melt and further mix the materials. The extrudate was solidified by passing it between chilled rollers after which it fragmented into flakes. The flakes were then ground through a mill. The resulting powder was passed through an 80-mesh sieve to remove coarse particles. TABLE 3
  • the powder thus formed was found to have a T 9 of 56°C.
  • alumina grits 120 to 210 microns grade (available from Algrain Products P Ltd).
  • the profile of the surface was determined to be in the range of 30 to 40 microns using the Elcometer 233 digital surface profile gauge.
  • the powder composition of Table 3 was applied to the steel panels as a single coat using an electrostatic pistol.
  • the applied powder coating composition was cured by heating the substrate to 230 0 C and maintaining said temperature for 30 minutes.
  • the dry film thickness (DFT) of the coating on each of the panels was between 80 and 100 ⁇ m.
  • Six panels were then exposed to different temperature regimes as shown in Table 4. Each panel was then subjected to 500 hours hot neutral salt spray in accordance with the procedure of ISO 09227. Undercreep of the applied coating was evaluated in accordance with the procedure of ASTM B-117. The results of these tests are also illustrated in Table 4.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

L'invention concerne une composition de revêtement pulvérulente qui comprend un composant de résine et une charge. Le composant de résine comprend une première résine de silicone et une seconde résine de silicone, lesdites première et seconde résines de silicone étant caractérisées par le fait qu'elles ont des températures de transition vitreuses (T9) qui sont différentes d'au moins 5 °C et/ou par le fait qu'elles ont des viscosités à l'état fondu, telles que mesurées à 140°C, qui sont différentes d'au moins 5, de préférence d'au moins 10, poises.
PCT/EP2008/058260 2007-07-02 2008-06-27 Composition de revêtement pulvérulente pour des revêtements résistants aux températures élevées WO2009003937A1 (fr)

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Application Number Priority Date Filing Date Title
CN200880023136A CN101720345A (zh) 2007-07-02 2008-06-27 用于耐高温涂层的粉末涂料组合物

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IN955/KOL/2007 2007-07-02
IN955KO2007 2007-07-02
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WO2010034517A1 (fr) * 2008-09-26 2010-04-01 University Of Ulster Composition de revêtement en poudre
WO2014202495A1 (fr) * 2013-06-19 2014-12-24 Akzo Nobel Coatings International B.V. Composition pour une peinture en poudre résistante aux hautes températures, son procédé de préparation et son utilisation
US9758665B2 (en) * 2004-12-22 2017-09-12 Imperial Chemical Industries Limited Aqueous polymer dispersions
CN115595570A (zh) * 2022-07-18 2023-01-13 上海闻敬化工科技有限公司（Cn） 一种有机硅树脂在金属工件表面处理中的应用
CN116716026A (zh) * 2023-07-18 2023-09-08 老虎表面技术新材料（苏州）有限公司 一种金属效果粉末涂料组合物及其固化方法和涂层

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TWI462782B (zh) * 2009-12-10 2014-12-01 Hon Hai Prec Ind Co Ltd 噴塗方法
CN103031014B (zh) * 2012-12-12 2015-11-18 中国科学院过程工程研究所 一种非导电基材粉末涂料涂层的制备方法
CN109504279B (zh) * 2013-06-19 2022-03-15 阿克佐诺贝尔国际涂料股份有限公司 耐高温粉末涂料组合物、其制备方法及其用途
CN107674582B (zh) * 2017-10-19 2019-12-20 广东捷宇粉体涂料有限公司 一种耐候型耐明火灼烧的粉末涂料及其制备工艺
FR3090621B1 (fr) * 2018-12-20 2022-07-22 Eurokera Article vitroceramique
CN113088184B (zh) * 2021-03-17 2022-07-22 威士伯涂料（上海）有限公司 耐高温粉末涂料组合物以及制品

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US9758665B2 (en) * 2004-12-22 2017-09-12 Imperial Chemical Industries Limited Aqueous polymer dispersions
WO2010034517A1 (fr) * 2008-09-26 2010-04-01 University Of Ulster Composition de revêtement en poudre
WO2014202495A1 (fr) * 2013-06-19 2014-12-24 Akzo Nobel Coatings International B.V. Composition pour une peinture en poudre résistante aux hautes températures, son procédé de préparation et son utilisation
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JP2016529337A (ja) * 2013-06-19 2016-09-23 アクゾ ノーベル コーティングス インターナショナル ビー ヴィ 耐高温性粉体被覆の組成物、その調製方法、及びその使用
AU2014283435B2 (en) * 2013-06-19 2016-09-29 Akzo Nobel Coatings International B.V. A composition of high temperature resistent powder coating, a preparation method therefore, and use thereof
RU2667546C2 (ru) * 2013-06-19 2018-09-21 Акцо Нобель Коатингс Интернэшнл Б.В. Композиция для жаростойкого порошкового покрытия, способ ее получения и ее применение
US10294374B2 (en) * 2013-06-19 2019-05-21 Akzo Nobel Coatings International B.V. Composition of high temperature resistent powder coating, a preparation method therefore, and use thereof
CN115595570A (zh) * 2022-07-18 2023-01-13 上海闻敬化工科技有限公司（Cn） 一种有机硅树脂在金属工件表面处理中的应用
CN116716026A (zh) * 2023-07-18 2023-09-08 老虎表面技术新材料（苏州）有限公司 一种金属效果粉末涂料组合物及其固化方法和涂层

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