CN117066081B - Coating method of non-oriented silicon steel thin strip self-adhesive coating - Google Patents
Coating method of non-oriented silicon steel thin strip self-adhesive coating Download PDFInfo
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- CN117066081B CN117066081B CN202311345127.2A CN202311345127A CN117066081B CN 117066081 B CN117066081 B CN 117066081B CN 202311345127 A CN202311345127 A CN 202311345127A CN 117066081 B CN117066081 B CN 117066081B
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- 238000000576 coating method Methods 0.000 title claims abstract description 122
- 239000011248 coating agent Substances 0.000 title claims abstract description 112
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 66
- 239000000853 adhesive Substances 0.000 title claims abstract description 60
- 238000001035 drying Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 33
- 238000004140 cleaning Methods 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000012459 cleaning agent Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 230000001680 brushing effect Effects 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000000176 sodium gluconate Substances 0.000 claims description 3
- 229940005574 sodium gluconate Drugs 0.000 claims description 3
- 235000012207 sodium gluconate Nutrition 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0808—Details thereof, e.g. surface characteristics
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a coating method of a self-adhesive coating of a non-oriented silicon steel thin strip, which comprises the steps of sequentially arranging low-temperature, medium-temperature and high-temperature sections in a drying furnace, wherein the length of the low-temperature section Duan Lu is 35-40 m, the length of the low-temperature section Duan Luwen is 120-140 ℃, the length of the medium-temperature section Duan Lu is 25-30 m, the length of the medium-temperature section Duan Luwen is 150-160 ℃, the furnace length of the high-temperature section is 10-20 m, the furnace temperature of the high-temperature section is 170-180 ℃, the conveying speed of the thin strip in the furnace is controlled to be 100-110 m/min, the non-oriented silicon steel thin strip coated with the coating is subjected to low-temperature, medium-temperature and high-temperature sections, and the water is mostly assisted in the low-medium-temperature section Duan Quchu by adopting stepped heating and matched parameters, so that the coating is not easy to dry incompletely or excessively, the activity of the self-adhesive coating is ensured, and the coating quality is improved.
Description
Technical Field
The invention relates to the technical field of silicon steel plate strip coatings, in particular to a coating method of a non-oriented silicon steel strip self-adhesive coating.
Background
The conventional motor iron core is fixed between silicon steel sheets (namely silicon steel thin strips) in a local dispensing mode, the connecting force between the silicon steel sheets in the fixing mode is not high, and the requirement of high-speed running of a new energy automobile motor on fastening strength is difficult to meet. The self-adhesive coating is coated on the silicon steel sheets in advance, so that the silicon steel sheets can be adhered together in a 'face' fixing mode to form the iron core, and the method can remarkably improve the fastening strength of connection between the silicon steel sheets.
The method comprises the steps of firstly, rolling the self-adhesive coating in a liquid state (A stage) on a silicon steel strip, drying the silicon steel strip at a proper temperature and time to form a dry and soft coating (B stage) with reactivity, then, laminating an iron core formed by stacking the silicon steel sheets with the coating in the B stage, and pressing and heating the iron core for a certain time to form a three-dimensional reticular structure (C stage) through softening, melting and quick crosslinking reaction of epoxy resin and a curing agent, wherein the step of converting the self-adhesive coating from the A stage to the B stage is the key for ensuring the bonding quality between the silicon steel sheets.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The main purpose of the present invention is to solve the technical problems mentioned in the above background section in the prior art coating methods of self-adhesive coating of non-oriented silicon steel thin strips.
The invention comprises the following steps:
a method for coating a self-adhesive coating on a non-oriented silicon steel strip, comprising the following steps:
preparing a cleaning tank liquid, and controlling the free alkalinity of the cleaning tank liquid to be 25-35 pt and the temperature to be 50-65 ℃;
feeding the non-oriented silicon steel thin strip into the cleaning tank liquid and cleaning by using a brushing roller, wherein the pressure of the brushing roller is controlled to be 100-150N;
washing and drying the cleaned non-oriented silicon steel thin strip with clear water, and then feeding the washed non-oriented silicon steel thin strip into a coating line to coat a self-adhesive coating, wherein the coating liquid of the self-adhesive coating comprises water-based phenolic epoxy resin, a curing agent, an accelerator, a solvent and water;
the non-oriented silicon steel thin strip coated with the self-adhesive coating is sent into a drying furnace for drying, the drying furnace comprises a low-temperature section, a middle-temperature section and a high-temperature section, the furnace length of the low-temperature section is 35-40 m, the furnace temperature of the low-temperature section is 120-140 ℃, the furnace length of the middle-temperature section is 25-30 m, the furnace temperature of the middle-temperature section is 150-160 ℃, the furnace length of the high-temperature section is 10-20 m, the furnace temperature of the high-temperature section is 170-180 ℃, the non-oriented silicon steel thin strip sequentially passes through the low-temperature section, the middle-temperature section and the high-temperature section, and the conveying speed of the non-oriented silicon steel thin strip in the drying furnace is 100-110 m/min;
and performing thickness detection and performance detection on the dried non-oriented silicon steel thin strip coated with the self-adhesive coating to obtain a qualified self-adhesive coating non-oriented silicon steel thin strip, wherein the performance detection comprises iron loss detection, magnetic loss detection, coating adhesion detection and insulation resistance detection.
In an optional embodiment of the present invention, the preparing the cleaning tank solution and controlling the free alkalinity of the cleaning tank solution to be 25-35 pt, and the temperature to be 50-65 ℃ includes:
deionized water with conductivity of <20 mu S/cm is added to 60% liquid level of the cleaning tank, and the cleaning agent is used as follows: deionized water=1 (8-10), adding a cleaning agent in a volume ratio, starting a circulating pump to run for 30min, checking the free alkalinity of the cleaning tank liquid, adjusting the free alkalinity to 25-35 pt, and simultaneously starting a heating system to adjust the temperature of the cleaning tank liquid to 50-65 ℃.
In an alternative embodiment of the invention, the cleaning agent comprises, by mass, 2-5% of potassium hydroxide, 0.01-0.03% of surfactant 226SA, 0.5-0.8% of sodium gluconate, 0.2-0.4% of EDTA and the balance of water.
In an alternative embodiment of the invention, the uncoiling tension of the coating line is 80-90 Kg, the front loop tension is 120-160 Kg, the front S roller tension is 90-120 Kg, the in-furnace tension is 50-80 Kg, the rear S roller tension is 120-150 Kg, the rear loop tension is 180Kg, and the curling tension is 190-250 Kg.
In an optional embodiment of the invention, the coating roller in the coating line is a polyurethane smooth roller, the surface roughness Ra value is 0.2-0.3, and the hardness is 55-59 HV; the metering roller in the coating line is a stainless steel type smooth roller, and the surface roughness Ra value is 0.08-0.1; the pressure of the coating roller and the pressure of the metering roller are controlled to be 50-55N.
In an optional embodiment of the invention, in terms of mass ratio, in the coating liquid of the self-adhesive coating, the water-based phenolic epoxy resin is 45-48%; 2-4% of a curing agent; 0.5-1% of an accelerator: 5-8% of a solvent.
In an alternative embodiment of the invention, the specific gravity of the coating liquid of the self-adhesive coating is 1.02-1.08, and the viscosity is 30-60 s.
In an optional embodiment of the present invention, the hot air exhaust volume of the low temperature section is 40-50% of the rated fan exhaust volume of the coating line, the hot air exhaust volume of the medium temperature section is 10-15% of the rated fan exhaust volume of the coating line, and the hot air exhaust volume of the high temperature section is 5% of the rated fan exhaust volume of the coating line.
In an alternative embodiment of the invention, the humidity in the furnace in the low temperature section is less than 65%, the humidity in the furnace in the medium temperature section is less than 20%, and the humidity in the furnace in the high temperature section is less than 5%.
In an alternative embodiment of the invention, the non-oriented silicon steel thin strip is a non-oriented silicon steel thin strip with the model of 50W400, the thickness of the self-adhesive coating is 4-6 mu m, and the T peel strength of the self-adhesive coating is more than 3N/mm.
The beneficial effects are that: the invention provides a coating method of a self-adhesive coating of a non-oriented silicon steel thin strip, when the non-oriented silicon steel thin strip coated with the self-adhesive coating is fed into a drying furnace for drying, a low-temperature section, a middle-temperature section and a high-temperature section are sequentially arranged in the drying furnace, the furnace length of the low-temperature section is 35-40 m, the furnace temperature of the low-temperature section is 120-140 ℃, the furnace length of the middle-temperature section is 25-30 m, the furnace temperature of the middle-temperature section is 150-160 ℃, the furnace length of the high-temperature section is 10-20 m, the furnace temperature of the high-temperature section is 170-180 ℃, the conveying speed of the non-oriented silicon steel thin strip coated with the self-adhesive coating in the drying furnace is controlled to be 100-110 m/min, the non-oriented silicon steel thin strip coated with the self-adhesive coating is dried sequentially through the low-temperature section, the middle-temperature section and the high-temperature section, most of moisture is dried at the low temperature and the middle-temperature Duan Quchu by adopting stepped heating and matching with the adaptive parameters, the high-temperature section is used as an auxiliary coating, the non-drying is difficult to completely or excessively dry, the self-adhesive coating quality is ensured, and the self-adhesive coating quality is improved.
Drawings
FIG. 1 is a block flow diagram of a method for coating a self-adhesive coating on a non-oriented silicon steel strip according to the present invention.
Detailed Description
The present invention will be described in further detail below in order to make the objects, technical solutions and effects of the present invention more clear and distinct. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the invention provides a coating method of a self-adhesive coating of a non-oriented silicon steel thin strip, which comprises the following steps:
s100, preparing a cleaning tank liquid, and controlling the free alkalinity of the cleaning tank liquid to be 25-35 pt and the temperature to be 50-65 ℃; in this embodiment, specifically, the preparing the cleaning tank liquid and controlling the free alkalinity of the cleaning tank liquid to be 25-35 pt and the temperature to be 50-65 ℃ includes: deionized water with conductivity of <20 mu S/cm is added to 60% liquid level of the cleaning tank, and the cleaning agent is used as follows: deionized water=1 (8-10), adding a cleaning agent in a volume ratio, starting a circulating pump to run for 30min, checking the free alkalinity of the cleaning tank liquid, adjusting the free alkalinity to 25-35 pt, and simultaneously starting a heating system to adjust the temperature of the cleaning tank liquid to 50-65 ℃.
S200, conveying the non-oriented silicon steel thin strip into the cleaning tank liquid and cleaning by using a brushing roller, wherein the pressure of the brushing roller is controlled to be 100-150N; in the invention, the non-oriented silicon steel thin strip is a non-oriented silicon steel thin strip with the model of 50W400, the cleaning tank liquid mainly has the function of removing residual rolling oil or rolling solution on the non-oriented silicon steel thin strip, and the cleaning agent comprises, by mass, 2-5% of potassium hydroxide, 0.01-0.03% of surfactant 226SA, 0.5-0.8% of sodium gluconate and 0.2-0.4% of EDTA and the balance of water.
S300, washing and drying the cleaned non-oriented silicon steel thin strip with clear water, and then conveying the washed non-oriented silicon steel thin strip into a coating line to coat a self-adhesive coating, wherein the coating liquid of the self-adhesive coating comprises waterborne phenolic epoxy resin, a curing agent, an accelerator, a solvent and water; exemplary, in terms of mass ratio, in the coating liquid of the self-adhesive coating, the water-based phenolic epoxy resin is 45-48%; 2-4% of a curing agent; 0.5-1% of an accelerator: the solvent is 5-8%, the specific gravity of the coating liquid of the self-adhesive coating is 1.02-1.08, the viscosity is 30-60 s, the self-adhesive coating is coated on a continuously running non-oriented silicon steel thin strip in a roller coating mode, the self-adhesive coating adopts a high polymer material as a main agent and is fastened in a self-adhesive mode, so that the self-adhesive coating has excellent characteristics in various aspects such as punching property, performance after being fastened into an iron core, and the like, the self-adhesive coating has the characteristics of high insulating strength, good corrosion resistance, good punching property and high adhesive strength,
in the embodiment, the uncoiling tension of the coating line is 80-90 Kg, the front loop tension is 120-160 Kg, the front S roller tension is 90-120 Kg, the in-furnace tension is 50-80 Kg, the rear S roller tension is 120-150 Kg, the rear loop tension is 180Kg, and the curling tension is 190-250 Kg. The coating roller in the coating line is a polyurethane type smooth roller, the surface roughness Ra value is 0.2-0.3, and the hardness is 55-59 HV; the metering roller in the coating line is a stainless steel type smooth roller, and the surface roughness Ra value is 0.08-0.1; the pressure of the coating roller and the pressure of the metering roller are controlled to be 50-55N. Under the above parameters, the non-oriented silicon steel thin strip can be moderately straightened, so that the surface of the non-oriented silicon steel thin strip is smoother, the self-adhesive coating is more convenient to coat, and the thickness of the self-adhesive coating coated on the surface of the non-oriented silicon steel thin strip is more uniform.
S400, conveying the non-oriented silicon steel thin strip coated with the self-adhesive coating into a drying furnace for drying, wherein the drying furnace comprises a low-temperature section, a medium-temperature section and a high-temperature section, the furnace length of the low-temperature section is 35-40 m, the furnace temperature of the low-temperature section is 120-140 ℃, the furnace length of the medium-temperature section is 25-30 m, the furnace temperature of the medium-temperature section is 150-160 ℃, the furnace length of the high-temperature section is 10-20 m, the furnace temperature of the high-temperature section is 170-180 ℃, the non-oriented silicon steel thin strip sequentially passes through the low-temperature section, the medium-temperature section and the high-temperature section, and the conveying speed of the non-oriented silicon steel thin strip in the drying furnace is 100-110 m/min; further, the hot air exhaust volume of the low-temperature section is 40-50% of the rated fan exhaust volume of the coating line, the hot air exhaust volume of the medium-temperature section is 10-15% of the rated fan exhaust volume of the coating line, the hot air exhaust volume of the high-temperature section is 5% of the rated fan exhaust volume of the coating line, the humidity in the furnace of the low-temperature section is controlled to be less than 65%, the humidity in the furnace of the medium-temperature section is controlled to be less than 20%, and the humidity in the furnace of the high-temperature section is controlled to be less than 5%.
The drying furnace is provided with a low-temperature section, the length is 35-40 m, the temperature is 120-140 ℃, the hot air discharge amount is 40-50% of the air discharge amount of a fan, after a non-oriented silicon steel thin strip passes through a coating roller, the surface of the non-oriented silicon steel thin strip is coated with a moist self-adhesive coating, and a large amount of moisture is contained in the coating. Through low temperature and hot air fast flow drying, more than 90% of water in the coating can be uniformly evaporated, the defect of punctiform air holes caused by bubble formation on the surface of the coating is avoided, the hot air discharge amount is controlled to be 40-50% of the air discharge amount of a fan, the evaporated water is rapidly discharged out of the furnace, and the drying speed is improved. The plate strip dried by the low-temperature section is subjected to medium temperature Duan Honggan, the medium temperature section is 25-30 m long, the temperature is 150-160 ℃, the hot air discharge amount is 10-15% of the air discharge amount of a fan, the residual water accounting for about 10% is basically evaporated, finally, the plate strip is dried by the high-temperature section, the temperature is Wen Duanchang-20 m, the temperature is 170-180 ℃, the hot air discharge amount is 5% of the air discharge amount of the fan, and the residual water is dried, so that a dry, soft and reactive coating can be formed, and under the parameter setting, the running speed of the non-oriented silicon steel strip can be increased from 70-80 m/min to 100-110 m/min, so that the production efficiency is increased by about 40%.
S500, performing thickness detection and performance detection on the dried non-oriented silicon steel thin strip coated with the self-adhesive coating to obtain a qualified self-adhesive coating non-oriented silicon steel thin strip, wherein the performance detection comprises iron loss detection, magnetic loss detection, coating adhesion detection (such as T peeling strength detection) and insulation resistance detection. In an alternative embodiment of the invention, the thickness of the self-adhesive coating is 4-6 μm, and the T-peel strength of the self-adhesive coating is greater than 3N/mm.
In summary, the invention provides a coating method of a self-adhesive coating of a non-oriented silicon steel thin strip, when the non-oriented silicon steel thin strip coated with the self-adhesive coating is sent into a drying furnace for drying, a low temperature section, a middle temperature section and a high temperature section are sequentially arranged in the drying furnace, the furnace length of the low temperature section is 35-40 m, the furnace temperature of the low temperature section is 120-140 ℃, the furnace length of the middle temperature section is 25-30 m, the furnace temperature of the middle temperature section is 150-160 ℃, the furnace length of the high temperature section is 10-20 m, the furnace temperature of the high temperature section is 170-180 ℃, the conveying speed of the non-oriented silicon steel thin strip in the drying furnace is controlled to be 100-110 m/min, the non-oriented silicon steel thin strip coated with the self-adhesive coating is dried sequentially through the low temperature section, the middle temperature section and the high temperature section, most of moisture is at the low temperature, the middle temperature Duan Quchu and the high temperature section is used as an auxiliary, the coating is not easy to be dried by surface incompletely or the drying of the epoxy resin inside the coating is enabled to be dried, the self-adhesive coating quality is guaranteed, and the self-adhesive coating quality is improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. The coating method of the self-adhesive coating of the non-oriented silicon steel thin strip is characterized by comprising the following steps of:
preparing a cleaning tank liquid, and controlling the free alkalinity of the cleaning tank liquid to be 25-35 pt and the temperature to be 50-65 ℃;
feeding the non-oriented silicon steel thin strip into the cleaning tank liquid and cleaning by using a brushing roller, wherein the pressure of the brushing roller is controlled to be 100-150N;
washing and drying the cleaned non-oriented silicon steel thin strip with clear water, and then feeding the washed non-oriented silicon steel thin strip into a coating line to coat a self-adhesive coating, wherein the coating liquid of the self-adhesive coating comprises aqueous phenolic epoxy resin, a curing agent, an accelerator, a solvent and water;
the non-oriented silicon steel thin strip coated with the self-adhesive coating is sent into a drying furnace for drying, the drying furnace comprises a low-temperature section, a middle-temperature section and a high-temperature section, the furnace length of the low-temperature section is 35-40 m, the furnace temperature of the low-temperature section is 120-140 ℃, the furnace length of the middle-temperature section is 25-30 m, the furnace temperature of the middle-temperature section is 150-160 ℃, the furnace length of the high-temperature section is 10-20 m, the furnace temperature of the high-temperature section is 170-180 ℃, the non-oriented silicon steel thin strip sequentially passes through the low-temperature section, the middle-temperature section and the high-temperature section, and the conveying speed of the non-oriented silicon steel thin strip in the drying furnace is 100-110 m/min;
performing thickness detection and performance detection on the dried non-oriented silicon steel thin strip coated with the self-adhesive coating to obtain a qualified self-adhesive coating non-oriented silicon steel thin strip, wherein the performance detection comprises iron loss detection, magnetic loss detection, coating adhesion detection and insulation resistance detection;
the steps of preparing the cleaning tank liquid, controlling the free alkalinity of the cleaning tank liquid to be 25-35 pt and controlling the temperature to be 50-65 ℃ comprise the following steps:
deionized water with conductivity of <20 mu S/cm is added to 60% liquid level of the cleaning tank, and the cleaning agent is used as follows: deionized water=1 (8-10) adding a cleaning agent in a volume ratio, starting a circulating pump to run for 30min, checking the free alkalinity of the cleaning tank liquid, adjusting the free alkalinity to 25-35 pt, and starting a heating system to adjust the temperature of the cleaning tank liquid to 50-65 ℃;
the cleaning agent comprises, by mass, 2-5% of potassium hydroxide, 0.01-0.03% of surfactant 226SA, 0.5-0.8% of sodium gluconate, 0.2-0.4% of EDTA tetrasodium and the balance of water;
the uncoiling tension of the coating line is 80-90 Kg, the front loop tension is 120-160 Kg, the front S roller tension is 90-120 Kg, the in-furnace tension is 50-80 Kg, the rear S roller tension is 120-150 Kg, the rear loop tension is 180Kg, and the curling tension is 190-250 Kg;
the coating roller in the coating line is a polyurethane type smooth roller, the surface roughness Ra value is 0.2-0.3, and the hardness is 55-59 HV; the metering roller in the coating line is a stainless steel type smooth roller, and the surface roughness Ra value is 0.08-0.1; the pressure of the coating roller and the pressure of the metering roller are controlled to be 50-55N;
in the coating liquid of the self-adhesive coating, the mass ratio of the aqueous phenolic epoxy resin is 45-48%; 2-4% of a curing agent; 0.5-1% of an accelerator; 5-8% of a solvent; the balance of deionized water;
the specific gravity of the coating liquid of the self-adhesive coating is 1.02-1.08, and the viscosity is 30-60 s;
the hot air exhaust volume of the low-temperature section is 40-50% of the rated fan exhaust volume of the coating line, the hot air exhaust volume of the medium-temperature section is 10-15% of the rated fan exhaust volume of the coating line, and the hot air exhaust volume of the high-temperature section is 5% of the rated fan exhaust volume of the coating line;
the humidity in the furnace of the low temperature section is less than 65%, the humidity in the furnace of the medium temperature section is less than 20%, and the humidity in the furnace of the high temperature section is less than 5%;
the non-oriented silicon steel thin strip is of a model 50W400, the thickness of the self-adhesive coating is 4-6 mu m, and the T peeling strength of the self-adhesive coating is more than 3N/mm.
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