CN112011250A - Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel - Google Patents
Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel Download PDFInfo
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/325—Calcium, strontium or barium phosphate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/326—Magnesium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
Abstract
The invention discloses a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following raw materials in percentage by mass: 30 to 80 percent of water-soluble phosphate, 5 to 45 percent of water-soluble polyol modified epoxy resin, 3 to 6 percent of acidic silica sol, 1.2 to 2 percent of corrosion inhibitor, 2.4 to 4 percent of catalyst, 0.4 to 0.6 percent of wetting agent, 0.8 to 1.2 percent of defoaming agent and the balance of deionized water. Compared with the prior art, the invention greatly reduces the curing film-forming temperature of the coating, reduces the construction cost of the coating and increases the application range of coating construction while ensuring the environmental protection and coating performance of the coating.
Description
Technical Field
The invention relates to the field of insulating coatings, in particular to a low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel.
Background
The non-oriented silicon steel is mainly used as a motor iron core material of various motors and most household appliances, and an insulating anticorrosive coating needs to be coated on the surface layer of the silicon steel in order to reduce eddy current loss of the silicon steel plate, ensure that the surface of the non-oriented silicon steel has higher resistivity, minimize interlaminar power loss and protect the silicon steel from being corroded by various corrosive media.
Currently, there are three main types of non-oriented silicon steel coatings: organic coating, inorganic coating, organic-inorganic coating (semi-inorganic coating). The general trend is that organic coatings have been phased out and inorganic coatings will gradually replace inorganic coatings. However, the semi-inorganic coating is still more widely applied at present due to the limitations of all conditions and the properties of the inorganic coating. Meanwhile, the coating without the nameplate environment-friendly coating can gradually replace the coating with the nameplate under the requirement of environment protection.
Patent CN 101560342a relates to a semi-organic phosphate insulating paint, whose main components include water-soluble phosphate, tungstate, organic resin, water, titanate coupling agent, organic solvent, etc.; based on 100 parts by weight of water-soluble phosphate, the insulating coating comprises the following components in parts by weight: 1 to 15 parts of tungstate, 20 to 200 parts of organic resin, 500 parts of water-2000-one, 0.1 to 3 parts of titanate coupling agent, 10 to 50 parts of organic solvent and 0.1 to 3 parts of other coating additives. After the coating is coated, the coating can be cured into a film only by baking for 30 seconds at the plate temperature of 300 ℃.
U.S. Amco, Chinese application No. 98125437.3, discloses an inorganic/organic insulative coating for nonoriented electrical steel comprising, per 100 parts dry basis, 20-60 parts aluminum phosphate, 20-70 parts particulate at least one inorganic silicate, and 10-25 parts of an acrylic resin; the cured coating is formed from an acidic aqueous suspension containing up to 1 part of a water-soluble organic solvent per 1 part of acrylic resin; the pH of the aqueous suspension is about 2.0-2.5, the silicate has an average particle size of 0.3-60 μm, the resin has a particle size of 1 μm or less, and the specific gravity is about 1.3 g/ml; the coating (aqueous suspension) was baked to form a film at a plate temperature of 220 ℃ and 350 ℃.
Patent CN 101255298A is a non-oriented electrical steel non-nameplate insulating coating, including metal phosphate, organic resin, molybdate, wherein the weight ratio of metal phosphate, organic resin, molybdate is: 1: 0.1-2: 0.0005-0.2. The temperature of the baking plate is 300-600 DEG C
The above coatings were analyzed, and one disadvantage of these coatings was the high required bake plate temperatures, which resulted in a large waste of energy; secondly, the coating equipment has higher requirements, and a huge and complex baking oven needs to be established; thirdly, the performance of the organic resin in the coating is influenced, and the too high temperature can lead to the premature aging of the resin film and influence the durability of the coating.
Disclosure of Invention
In order to overcome the defects of related products in the prior art, the invention provides the low-temperature fast curing environment-friendly insulating coating for the non-oriented electrical steel, which does not contain chromate with environmental hazard, has good insulation, corrosion resistance and processability, has the curing temperature which is obviously lower than that of a chromium-free environment-friendly insulating coating provided by the prior art, and has the curing film plate temperature of 180-200 ℃ and the baking time of 15 seconds.
The invention provides a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following raw materials in percentage by mass: 30 to 80 percent of water-soluble phosphate, 5 to 45 percent of water-soluble polyol modified epoxy resin, 3 to 6 percent of acidic silica sol, 1.2 to 2 percent of corrosion inhibitor, 2.4 to 4 percent of catalyst, 0.4 to 0.6 percent of wetting agent, 0.8 to 1.2 percent of defoaming agent and the balance of deionized water.
In certain embodiments of the present invention, the dihydrogen phosphate comprises at least one of aluminum dihydrogen phosphate, calcium dihydrogen phosphate, zinc dihydrogen phosphate, and magnesium dihydrogen phosphate.
In some embodiments of the present invention, the water-soluble polyol modified epoxy resin is a water-soluble resin prepared by etherification reaction of one or more of polyvinyl alcohol, polyethylene glycol and polypropylene glycol with one or two of epoxy resins E44 and E51.
In some embodiments of the invention, the acidic silica sol is an aluminum modified acidic silica sol, the silica content is 20% -30%, the pH value is 2-3, and the particle size is 5-10 nm.
In some embodiments of the present invention, the corrosion inhibitor is one or more of hydroxyethylidene diphosphonic acid, sodium nitrite, benzotriazole, and ammonium molybdate.
In some embodiments of the present invention, the catalyst is one or more of urea, bis-methane sulfonic acid, and alkyl benzene sulfonic acid.
In certain embodiments of the invention, the wetting agent is BYK-333 from Pyk, Germany.
In certain embodiments of the invention, the defoamer is BYK-028 from Pyk, Germany.
In certain embodiments of the invention, the following preparation steps are included:
step 1): adding water-soluble phosphate, acidic silica sol and corrosion inhibitor into a reaction kettle according to the formula amount, and uniformly stirring;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding the water-soluble polyol modified epoxy resin with the formula amount, and stirring for 2 hours at 50 ℃ after the addition is finished to obtain a mixture I;
step 3): and cooling the mixture I to room temperature, adding the catalyst, the wetting agent, the defoaming agent and the deionized water according to the formula ratio, stirring at a medium speed for 1 hour, filtering and discharging to obtain the final coating product.
The using method of the invention comprises the following steps: the annealed non-oriented electrical steel plate is coated with rubber wools in the coating amount of 1.2-4g/m2 and baked for 15 seconds at the plate temperature of 180-200 ℃ to obtain an insulating coating with excellent adhesion. The stress relief annealing is carried out under the protective atmosphere of nitrogen and hydrogen, the temperature is kept at 750-800 ℃ for 2 hours, and the volume ratio of the nitrogen to the hydrogen is 9: 0-1.
Compared with the prior art, the invention has the following advantages:
the low-temperature fast-curing environment-friendly insulating coating for the non-oriented electrical steel, provided by the invention, is a thin coating with the thickness of C4 level, ensures the environment friendliness and excellent performance of the coating, greatly reduces the temperature required for baking and film forming, greatly reduces the energy cost and improves the productivity by using the coating on the traditional horizontal coating equipment for the non-oriented electrical steel. In addition, the coating can be compatible with vertical coating equipment for coating the fingerprint-resistant coating, and a new scheme is provided for transformation production of non-oriented electrical steel by other enterprises.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Example 1
The embodiment of the invention provides a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following components: 500kg of aluminum dihydrogen phosphate, 150kg of waterborne polyvinyl alcohol modified epoxy resin, 50kg of aluminum modified acidic silica sol, 12kg of hydroxyethylidene diphosphonic acid, 30kg of urea, BYK-3335 kg, BYK-02810 kg and 243kg of deionized water;
the preparation method comprises the following steps:
step 1): adding 500kg of aluminum dihydrogen phosphate, 50kg of aluminum modified acidic silica sol and 12kg of hydroxyethylidene diphosphonic acid into a reaction kettle, and uniformly stirring;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding 150kg of aqueous polyvinyl alcohol modified epoxy resin (after about one hour of addition), keeping the temperature at 50 ℃ after the addition is finished, and stirring for 2 hours to obtain a mixture I
Step 3): and cooling the mixture I to room temperature, mixing 30kg of urea, BYK-3335 kg, BYK-02810 kg and 243kg of deionized water, stirring at a medium speed for 1 hour, filtering and discharging to obtain a final coating product.
Example 2
The embodiment of the invention provides a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following components: 600kg of magnesium dihydrogen phosphate, 200kg of waterborne polyethylene glycol modified epoxy resin, 60kg of aluminum modified acidic silica sol, 18kg of sodium nitrite, 26kg of bis-methanesulfonic acid, BYK-3336 kg, BYK-02811 kg and 79kg of deionized water;
the preparation method comprises the following steps:
step 1): adding 600kg of magnesium dihydrogen phosphate, 60kg of aluminum modified acidic silica sol and 18kg of sodium nitrite into a reaction kettle, and uniformly stirring;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding 200kg of waterborne polyethylene glycol modified epoxy resin (after about one hour of addition), keeping the temperature at 50 ℃ after the addition is finished, and stirring for 2 hours to obtain a mixture I
Step 3): and cooling the mixture I to room temperature, stirring 26kg of bis-methanesulfonic acid, BYK-3336 kg, BYK-02811 kg and 79kg of deionized water at medium speed for 1 hour, filtering and discharging to obtain a final coating product.
Example 3
The embodiment of the invention provides a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following components: 800kg of monocalcium phosphate, 50kg of waterborne polypropylene glycol modified epoxy resin, 30kg of aluminum modified acidic silica sol, 20kg of benzotriazole, 40kg of alkylbenzene sulfonic acid, BYK-3334 kg, BYK-02812kg and 44kg of deionized water;
the preparation method comprises the following steps:
step 1): 800kg of monocalcium phosphate, 30kg of aluminum modified acidic silica sol and 20kg of benzotriazole are added into a reaction kettle and uniformly stirred;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding 50kg of waterborne polypropylene glycol modified epoxy resin (after about one hour of addition), keeping the temperature at 50 ℃ after the addition is finished, and stirring for 2 hours to obtain a mixture I
Step 3): and cooling the mixture I to room temperature, mixing 40kg of alkyl benzene sulfonic acid, 40kg of BYK-3334 kg of alkyl benzene sulfonic acid, 40kg of BYK-02812kg of alkyl benzene sulfonic acid and 44kg of deionized water, stirring at a medium speed for 1 hour, filtering and discharging to obtain a final coating product.
Example 4
The embodiment of the invention provides a low-temperature fast curing environment-friendly insulating coating for non-oriented electrical steel, which comprises the following components: 300kg of zinc dihydrogen phosphate, 450kg of waterborne polyvinyl alcohol modified epoxy resin, 30kg of aluminum modified acidic silica sol, 12kg of ammonium molybdate, 24kg of alkylbenzene sulfonic acid, BYK-3334 kg, BYK-02812kg and 168kg of deionized water;
the preparation method comprises the following steps:
step 1): 300kg of zinc dihydrogen phosphate, 30kg of aluminum modified acidic silica sol and 12kg of ammonium molybdate 20kg are added into a reaction kettle and stirred uniformly;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding 450kg of aqueous polyvinyl alcohol modified epoxy resin (after about one hour of addition), keeping the temperature at 50 ℃ after the addition is finished, and stirring for 2 hours to obtain a mixture I
Step 3): and cooling the mixture I to room temperature, stirring 24kg of alkyl benzene sulfonic acid, BYK-3334 kg, BYK-02812kg and 168kg of deionized water at medium speed for 1 hour, filtering and discharging to obtain a final coating product.
Those not described in detail in this specification are within the skill of the art. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalents that can be substituted by the contents of the specification of the present invention and applied directly or indirectly to other related technical fields are within the scope of the present invention.
Claims (9)
1. The low-temperature fast-curing environment-friendly insulating coating for the non-oriented electrical steel is characterized by comprising the following raw materials in percentage by mass: 30 to 80 percent of water-soluble phosphate, 5 to 45 percent of water-soluble polyol modified epoxy resin, 3 to 6 percent of acidic silica sol, 1.2 to 2 percent of corrosion inhibitor, 2.4 to 4 percent of catalyst, 0.4 to 0.6 percent of wetting agent, 0.8 to 1.2 percent of defoaming agent and the balance of deionized water.
2. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the dihydric phosphate comprises at least one of aluminum dihydrogen phosphate, calcium dihydrogen phosphate, zinc dihydrogen phosphate and magnesium dihydrogen phosphate.
3. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the water-soluble polyol modified epoxy resin is prepared by etherification reaction of one or more of polyvinyl alcohol, polyethylene glycol and polypropylene glycol with one or two of epoxy resins E44 and E51.
4. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the acidic silica sol is aluminum modified acidic silica sol, the content of silicon dioxide is 20-30%, the PH value is 2-3, and the particle size is 5-10 nm.
5. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the corrosion inhibitor is one or more of hydroxyethylidene diphosphonic acid, sodium nitrite, benzotriazole and ammonium molybdate.
6. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the catalyst is one or more of urea, bis-methanesulfonic acid and alkylbenzene sulfonic acid.
7. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the wetting agent is BYK-333 from Pyk, Germany.
8. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel as claimed in claim 1, wherein: the antifoaming agent is BYK-028 from Bick, Germany.
9. The low-temperature fast-curing environment-friendly insulating paint for the non-oriented electrical steel according to any one of claims 1 to 8, characterized by comprising the following preparation steps:
step 1): adding water-soluble phosphate, acidic silica sol and corrosion inhibitor into a reaction kettle according to the formula amount, and uniformly stirring;
step 2): heating the mixture obtained in the step 1) to 50 ℃, slowly adding the water-soluble polyol modified epoxy resin with the formula amount, and stirring for 2 hours at 50 ℃ after the addition is finished to obtain a mixture I;
step 3): and cooling the mixture I to room temperature, adding the catalyst, the wetting agent, the defoaming agent and the deionized water according to the formula ratio, stirring at a medium speed for 1 hour, filtering and discharging to obtain the final coating product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010857712.0A CN112011250A (en) | 2020-08-24 | 2020-08-24 | Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel |
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| CN202010857712.0A CN112011250A (en) | 2020-08-24 | 2020-08-24 | Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112642674A (en) * | 2020-12-23 | 2021-04-13 | 安阳钢铁股份有限公司 | Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel |
| CN112778861A (en) * | 2021-01-08 | 2021-05-11 | 南京博塽工贸发展有限公司 | Insulating coating liquid for non-oriented electrical steel |
| CN116179081A (en) * | 2021-11-26 | 2023-05-30 | 海洋化工研究院有限公司 | High-solid low-viscosity universal primer and preparation method thereof |
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| CN107236413A (en) * | 2017-05-10 | 2017-10-10 | 广东富毅电气绝缘材料有限公司 | A kind of single-component water-based epoxy resin coating and preparation method thereof |
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2020
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| CN1903498A (en) * | 2005-07-28 | 2007-01-31 | 宝山钢铁股份有限公司 | Method for producing non-orientation electric steel plates with insulation coatings |
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| CN112642674A (en) * | 2020-12-23 | 2021-04-13 | 安阳钢铁股份有限公司 | Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel |
| CN112778861A (en) * | 2021-01-08 | 2021-05-11 | 南京博塽工贸发展有限公司 | Insulating coating liquid for non-oriented electrical steel |
| CN116179081A (en) * | 2021-11-26 | 2023-05-30 | 海洋化工研究院有限公司 | High-solid low-viscosity universal primer and preparation method thereof |
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