CN112778861A - Insulating coating liquid for non-oriented electrical steel - Google Patents
Insulating coating liquid for non-oriented electrical steel Download PDFInfo
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- CN112778861A CN112778861A CN202110023277.6A CN202110023277A CN112778861A CN 112778861 A CN112778861 A CN 112778861A CN 202110023277 A CN202110023277 A CN 202110023277A CN 112778861 A CN112778861 A CN 112778861A
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- 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 relates to a non-oriented electrical steel sheet insulation coating liquid, the main effective components of which comprise organic resin, water-soluble dihydric phosphate, silica sol, coating auxiliary agent and specific water-soluble metal salt. The mass composition proportion of the components is as follows: 100 parts of organic resin, 100 parts of water-soluble dihydric phosphate, 250 parts of silica sol, 0-100 parts of coating additive, 10-50 parts of specific water-soluble metal salt and the balance of water, wherein the solid content of the coating liquid is 15-40%. Wherein the specific water-soluble metal salt is a divalent or polyvalent metal salt other than the water-soluble dihydrogen phosphate, which can be stably present in the dihydrogen phosphate solution but is oxidized or decomposed in the sintering temperature region of the electrical steel coating. The insulating masking liquid has the advantages of high curing speed, thorough curing and excellent salt mist resistance of the coating.
Description
Technical Field
The invention relates to a section insulation coating liquid for non-oriented electrical steel, in particular to a coating liquid coated on the surface of a non-oriented electrical steel sheet in the production process of the non-oriented electrical steel sheet, which has the effects of insulation, corrosion resistance and the like after being cured into a film.
Background
Electrical steel sheets, also called silicon steel sheets or silicon steel sheets, are mainly used for manufacturing iron cores of various motors, transformers and ballasts and various electrical elements, and a very thin insulating coating is required to be coated on the surfaces of the electrical steel sheets in the production process so as to improve the surface resistance, reduce the power loss in the use process and increase the corrosion resistance in the storage, transportation and use processes.
Typical requirements for electrical steel insulating coatings are: has certain insulating property, good adhesiveness and processability, good corrosion resistance and heat resistance, and the like.
The insulating coating liquid for the electrical steel sheet comprises the following components: pure inorganic coatings, organic coatings and inorganic/organic mixed coatings, and the inorganic/organic mixed coatings are more applied at present. Hexavalent chromium compounds such as zinc dichromate or magnesium dichromate have been commonly used in early coating solutions to improve corrosion resistance and surface resistance (e.g., US 3793073, US 4618377). Because hexavalent chromium causes serious harm to human bodies, the environment and the like, coating solutions containing hexavalent chromium are banned from being used in many developed countries such as europe and the united states, and are replaced by chromium-free environment-friendly electrical steel coating solutions. For example, JP 7268641 discloses an insulating coating for electrical steel sheet with good corrosion resistance, which is composed of a metal phosphate aqueous solution and a polymer resin emulsion; an invention patent (chinese patent CN 1161434) by Armocol corporation, usa, discloses an aqueous suspension of a mixed chromium-free insulating coating for non-oriented electrical steel sheet, which comprises an aqueous solution of aluminum dihydrogen phosphate, water-insoluble silicate microparticles, acrylic resin and the like.
China also starts to research and popularize the environment-friendly electrical steel coating liquid to reduce the harm of hexavalent chromium in the production process. For example, chinese patent CN 101168642a discloses a non-oriented electrical steel sheet insulating coating, which comprises the components of phosphate, molybdate, water, organic resin, etc.; chinese patent CN 1151212C discloses a chromium-free coating solution for electrical steel sheets, which mainly comprises polyacrylic resin, amino resin, water-insoluble ultrafine phosphate and silicate.
As can be seen from the above, the environment-friendly electrical steel coating liquid comprises two main components: an organic resin and an inorganic component. The organic resin is water-soluble or water-dispersible polymer, such as water-soluble epoxy resin, phenolic resin, or modified polyacrylic resin emulsion, etc., and generally accounts for 20-70%, usually 25-50%, of the effective component of the coating solution; the inorganic component is mainly phosphate, silicate, etc. and accounts for 30-80%, usually 50-75% of the effective components of the coating liquid, and has two inorganic types of water insoluble and water soluble. The water-insoluble inorganic substance includes phosphate or silicate, such as zinc phosphate, kaolin, mica powder, titanium dioxide, barium sulfate, etc., and the water-insoluble inorganic substance is dispersed in the coating liquid by ultra-fine dispersion to form water suspension. The disadvantage is that inorganic particles are gradually gathered and enlarged to generate sedimentation when the coating liquid is stored for a long time, thereby influencing the use; another disadvantage is that the smoothness and wear resistance of the coating surface are greatly affected when the amount of such inorganic substances is large, electrical steel sheets are prone to dusting during processing, and now water-insoluble inorganic substances have been used less in thin coatings of non-oriented electrical steel; the water-soluble inorganic matter is mainly dihydric phosphate, such as aluminum dihydrogen phosphate, magnesium dihydrogen phosphate, zinc dihydrogen phosphate and the like, or a mixture of two or more of the above substances (silica particles in silica sol are nano-scale and can be classified as water-soluble inorganic matter), and the water-soluble phosphate is easy to be effectively combined with organic resin to form a flat and bright coating when being cured, but has the defects that the curing is difficult mainly, particularly the surface layer part of the coating is difficult to be completely cured under the condition that the coating is thick, and the phenomenon that the coating absorbs moisture and is sticky after the electrical steel sheet is placed for a period of time is shown. The main reason for this problem is that some of the dihydrogen phosphate salts are mutually dehydrated and condensed into polyphosphate salts to be cured when the coating liquid is cured at a high temperature, but the polyphosphate salts are unstable structures and are hydrolyzed back to the original dihydrogen phosphate salts to absorb water and become sticky when being contacted with moisture for a long time, and the reaction formula is shown as follows:
m is a metal ion, e.g. Mg2+，Al3+，Zn2+And the like.
The main reason for this problem is that the molar ratio of metal ions to phosphate ions in the aqueous phosphate solution is required and cannot be adjusted at will. For example, in the case of aluminum dihydrogen phosphate, three dihydrogen phosphate ions must be combined to form water-soluble aluminum dihydrogen phosphate, and in order to stabilize the aqueous solution, phosphoric acid must be slightly in excess. Part of the phosphate groups can react with iron atoms of the electrical steel matrix to be cured during curing, and can also react with some active groups in the resin, such as epoxy groups, to be cured, the phosphate groups on the surface layer are relatively difficult to cure, and although the phosphate groups can mutually dehydrate and cure when meeting high temperature, the generated polyphosphate can be hydrolyzed to return to original dihydrogen phosphate when contacting with moisture for a long time. The main object of the present invention is to solve this problem and to provide a coating liquid which can be cured completely.
Disclosure of Invention
The invention aims to add a water-soluble metal salt into a non-oriented electrical steel coating liquid which takes dihydric phosphate as a main inorganic component, when the coating liquid is coated on the surface of electrical steel and heated and cured, the metal salt can be decomposed and reacts with the dihydric phosphate to ensure that the coating liquid is cured more thoroughly, thereby avoiding the problem that the electrical steel sheet is sticky in a humid environment or placed for a long time and improving the corrosion resistance of the electrical steel sheet.
In order to achieve the purpose, the technical scheme of the invention is as follows: a non-oriented electrical steel sheet insulating coating liquid comprises main effective components of organic resin, water-soluble dihydric phosphate, silica sol, coating auxiliary agent and specific water-soluble metal salt; the mass composition proportion of the components is as follows: 100 parts of organic resin, 100 parts of water-soluble dihydric phosphate, 250 parts of silica sol, 0-100 parts of coating additive, 10-50 parts of specific water-soluble metal salt and the balance of water;
the water-soluble dihydric phosphate: is divalent or polyvalent metal dihydrogen phosphate, including one or more of aluminum dihydrogen phosphate, magnesium dihydrogen phosphate, zinc dihydrogen phosphate, and calcium dihydrogen phosphate;
the specific water-soluble metal salt is a divalent or polyvalent metal salt except the water-soluble dihydrogen phosphate, can stably exist in the dihydrogen phosphate solution, and does not generate precipitate;
the specific water-soluble metal salt comprises carboxylate or nitrate containing hydroxyl, and the carboxylate containing hydroxyl is lactate, citrate, trihydroxy butyrate and gluconate; the metal ion in the specific water-soluble metal salt is Mg2+、Zn2 +、Ca2+Or Al3+。
Preferably, the solid content of the coating liquid is 15-40%.
Preferably, the anion of the specific water-soluble metal salt is oxidized or decomposed in the sintering temperature zone of the electrical steel coating, and the metal ion can precipitate the dihydric phosphate.
Preferably, the specific water-soluble metal salt is magnesium lactate, zinc gluconate, magnesium nitrate, calcium citrate, aluminum lactate or magnesium trihydroxybutyrate.
Preferably, the organic resin can be one or a mixture of more of polyacrylic resin or copolymer thereof, epoxy resin, modified epoxy resin and phenolic resin.
Preferably, the silica sol is acidic silica sol, and can stably exist in a water-soluble dihydrogen phosphate solution for a long time without generating gel or precipitation; the addition of the silica sol can enable the coating to be smoother and more compact, and improve the corrosion resistance and the insulating property of the electrical steel product.
Preferably, the coating auxiliary agent is one or more of a leveling agent, a film-forming auxiliary agent or a defoaming agent.
The non-oriented electrical steel sheet insulating coating liquid has the main effective components of organic resin (and curing agent), water soluble dihydrogen phosphate, silica sol, paint assistant, specific water soluble metal salt, etc. the coating liquid has the following weight portions: 100 parts of organic resin, 100 parts of water-soluble dihydric phosphate, 250 parts of silica sol, 0-100 parts of coating additive, 10-50 parts of specific water-soluble metal salt and the balance of water, so that the solid content of the coating liquid is 15-40%.
The organic resin can be one or a mixture of more of polyacrylic resin or copolymer thereof, epoxy resin or modified epoxy resin, phenolic resin and the like. The organic resin is in the form of polymer emulsion or solution self-dispersed in water, and can be crosslinked by itself or with a curing agent after being heated and dehydrated, and can be cured together with inorganic matters on the surface of an electrical steel sheet to form a film so as to form an insulating and anticorrosive coating;
the water-soluble dihydric phosphate is divalent or polyvalent metal dihydric phosphate, and comprises one or more of aluminum dihydrogen phosphate, magnesium dihydrogen phosphate, zinc dihydrogen phosphate, calcium dihydrogen phosphate, etc., and has filling, antirust, insulating, etc. effects in the coating. The water-soluble dihydrogen phosphate can react with iron, iron oxide and the like on the surface of the electric steel sheet substrate to become insoluble substances and adhere to the electric steel sheet substrate, and can also react with epoxy groups in the resin to produce phosphate ester salts and solidify the phosphate ester salts. In addition, the water-soluble dihydrogen phosphate salts can be dehydrated at high temperature to form polyphosphate, but the reaction is reversible, and the product polyphosphate can be hydrolyzed and converted into original dihydrogen phosphate salt when meeting moisture.
The silica sol is usually acidic silica sol, and can stably exist in a water-soluble dihydrogen phosphate solution for a long time without generating gel or precipitation; the addition of the silica sol can enable the coating to be smoother and more compact, and improve the corrosion resistance and the insulating property of the electrical steel product.
The paint auxiliary agent mainly comprises a flatting agent, a film-forming auxiliary agent, a defoaming agent, a small amount of cosolvent and the like, and is a substance with surface activity and a small amount of cosolvent such as propylene glycol ether and the like. The leveling property and the film forming property of the coating liquid during coating can be improved, the generation of foam during use is reduced or avoided, and the overall performance of the coating is improved.
The specific water-soluble metal salt is a divalent or polyvalent metal salt other than the water-soluble dihydrogen phosphate. The specific water-soluble metal salt comprises carboxylate or nitrate containing hydroxyl, wherein the carboxylate containing hydroxyl is lactate, citrate, trihydroxy butyrate and gluconate; the metal ion in this particular water-soluble metal salt is Mg2+、Zn2+、Ca2+、Al3+. The hydroxyl group of the hydroxyl group-containing carboxylic acid salt of the above-mentioned specific water-soluble metal salt is capable of coordinating with a divalent or higher metal, so that the specific water-soluble metal salt can be present in an aqueous solution together with a dihydrogenphosphate without causing precipitation of a dihydrogenphosphate or a dihydrogenphosphate; the nitrate of the specific water-soluble metal salt may be present in an aqueous solution together with the dihydrogen phosphate because the nitric acid is more acidic than the dihydrogen phosphate; the hydroxyl-containing carboxylate group and nitrate in the specific water-soluble metal saltAcid radical groups are unstable in a high-temperature environment, and are decomposed when coating liquid is coated on the surface of electrical steel and enters a high-temperature furnace for drying and curing, and are converted into carbonate or oxide, and the carbonate or oxide reacts with dihydric phosphate to convert the dihydric phosphate into water-insoluble dibasic phosphate or phosphate precipitate, so that the curing speed can be accelerated, the surface coating can be cured completely, and the corrosion resistance and the water resistance of the coating are improved.
The insulating masking liquid obtained by the invention has the advantages that:
the invention adds another specific water-soluble metal salt into the insulating coating liquid of the electrical steel which takes water-soluble dihydric phosphate as the main inorganic component, the specific water-soluble metal salt can coexist with the dihydric phosphate in aqueous solution without generating precipitation, but can be decomposed when the coating liquid is dried and solidified, and the released metal ions react with the dihydric phosphate to convert the metal ions into water-insoluble dibasic phosphate or phosphate precipitation, so that the surface coating is accelerated in solidification speed and thoroughly solidified, the corrosion resistance and the water resistance of the coating are improved, and the surface of the electrical steel sheet is not sticky after being placed for a long time.
The present invention will be further described by way of some examples, which should not be construed as limiting the scope of the invention.
Detailed Description
Example 1
47.3g of deionized water, 10.0g of aluminum dihydrogen phosphate, 1.0g of magnesium dihydrogen phosphate, and 0.5g of zinc dihydrogen phosphate were placed in a 250ml beaker, and the mixture was stirred at room temperature until it was dissolved. 1.2g of magnesium lactate trihydrate was added continuously and stirred until dissolved. 30.0g of polyacrylic resin emulsion with the solid content of 20 percent is added under stirring, after the stirring is uniform, 10.0g of acidic silica sol with the solid content of 20 percent is added, and after the stirring is sufficient, 100.0g of milky electrical steel insulating coating liquid is obtained, wherein the viscosity (coating in a cup of-4 at 20 ℃) is 11.2s, the specific gravity (20 ℃) is 1.13, and the pH value is 2.5.
Smearing with Webster wire roller (09#), drying in a forced air oven at 250 deg.C for 150s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 1120 omega-mm2And after 8 hours of salt spray experiment, the corrosion area is less than 1%. The coating is exposed to the environment at room temperature for 6And after the month, it was not sticky.
Example 2
The preparation method is the same as example 1, and the specific dosage of each component is as follows: 51.0g of deionized water, 10.0g of aluminum dihydrogen phosphate, 1.0g of magnesium dihydrogen phosphate, 10.0g of zinc gluconate with the solid content of 10%, 30.0g of polyacrylic resin emulsion with the solid content of 20% and 8.0g of acidic silica sol with the solid content of 20%. 100.0g of a colorless, transparent electrical steel coating liquid having a solids content of 20% and a viscosity (applied in-4 cups at 20 ℃) of 11.3s, a specific gravity (at 20 ℃) of 1.13 and a pH of 2.5 were obtained.
Smearing with Webster wire roller (07#), drying in a forced air oven at 350 deg.C for 45s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesion is good, and the surface resistance is 745 omega-mm2And after 8 hours of salt spray experiment, the corrosion area is less than 1%. The coating was not tacky after 6 months of ambient exposure.
Example 3
The preparation method is the same as example 1, and the specific dosage of each component is as follows: 69.7g of deionized water, 6.5g of aluminum dihydrogen phosphate, 6.5g of zinc magnesium dihydrogen phosphate, 0.6g of zinc dihydrogen phosphate, 1.2g of calcium citrate tetrahydrate, 13.0g of an aqueous modified epoxy resin with a solids content of 50%, 2.0g of an acidic silica sol with a solids content of 20%, and 0.5g of propylene glycol monomethyl ether. 100.0g of a colorless transparent electrical steel coating liquid having a solids content of 21.5% and a viscosity (applied in-4 cup at 20 ℃) of 11.4s, a specific gravity (at 20 ℃) of 1.14 and a pH of 2.5 were obtained.
Smearing with Webster wire roller (09#), drying in 500 deg.C air-blast oven for 20s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 1370 omega-mm2And no corrosion is caused after 8 hours of salt spray experiment. The coating was not tacky after 6 months of ambient exposure.
Example 4
The calcium citrate in example 3 was replaced with magnesium nitrate hexahydrate, the remainder being unchanged, giving 100.0g of a colorless, transparent electrical steel coating liquid having a solids content of 21.3%, a viscosity (in-4 cups at 20 ℃) of 11.4s, a specific gravity (at 20 ℃) of 1.14 and a pH of 2.5.
Smearing with Webster wire roller (09#), drying in 500 deg.C air-blast oven for 20s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 1230 omega-mm2And after 8 hours of salt spray experiment, the corrosion area is less than 1%. The coating was not tacky after 6 months of ambient exposure.
Example 5
The preparation method is the same as example 1, and the specific dosage of each component is as follows: 51.7g of deionized water, 18.0g of aluminum dihydrogen phosphate, 2.5g of magnesium dihydrogen phosphate, 0.5g of zinc dihydrogen phosphate, 0.8g of aluminum lactate, 1.0g of magnesium trihydroxybutyrate, 25.0g of an aqueous modified epoxy resin with a solid content of 50%, and 0.5g of propylene glycol monomethyl ether. 100.0g of a colorless transparent electrical steel coating liquid having a solid content of 35.0% and a viscosity (coat-4, 20 ℃ C.) of 14.2s, a specific gravity (20 ℃ C.) of 1.26 and a pH of 2.1 was obtained.
Smearing with Webster wire roller (05#), baking in 500 deg.C air-blast oven for 20s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 910 omega-mm2And after 8 hours of salt spray experiment, the corrosion area is less than 1%. The coating was not tacky after 6 months of ambient exposure.
Comparative example 1
47.9g of deionized water, 10.6g of aluminum dihydrogen phosphate, 1.0g of magnesium dihydrogen phosphate, and 0.5g of zinc dihydrogen phosphate were added to a beaker, and stirred at room temperature until dissolved. 30g of polyacrylic resin emulsion with the solid content of 20 percent is added under stirring, after the stirring is uniform, 10.0g of acidic silica sol with the solid content of 20 percent is added, and after the stirring is fully carried out, 100.0g of milky white electrical steel coating liquid with the solid content of 20 percent is obtained, the viscosity (coating in a cup of-4 ℃ at 20 ℃) is 11.2s, the specific gravity (20 ℃) is 1.13, and the pH value is 2.5.
Smearing with Webster wire roller (09#), drying in a forced air oven at 250 deg.C for 150s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 1280 omega-mm2And the corrosion area is about 5% after 8h of the salt spray experiment. The corrosion resistance was much different compared to example 1, since no magnesium lactate trihydrate was added.
Comparative example 2
60.0g of phosphate solution (containing 10.8g of aluminum dihydrogen phosphate and 1.2g of magnesium dihydrogen phosphate) with a solid content of 20% was added to a beaker, and 4.0g of zinc acetate solution with a solid content of 20% was added thereto, and stirring was carried out at room temperature, whereby a small amount of white precipitate was found, which was not dissolved into a clear and transparent solution and was not allowed to prepare a coating solution.
Comparative example 3
60g of phosphate solution (containing 10.8g of aluminum dihydrogen phosphate and 1.2g of magnesium dihydrogen phosphate) with 20% of solid content is added into a beaker, and 3.0g of calcium acetate solution with 20% of solid content is added, and stirring is carried out at room temperature, so that a small amount of white precipitate is found, the white precipitate cannot be dissolved into clear and transparent solution, and the coating solution cannot be prepared continuously.
Comparative example 4
The magnesium nitrate hexahydrate of example 4 was replaced with aluminum dihydrogen phosphate, and the remainder was unchanged. 100.0g of a colorless transparent electrical steel coating liquid having a solids content of 21.5% and a viscosity (applied in-4 cup at 20 ℃) of 11.4s, a specific gravity (at 20 ℃) of 1.14 and a pH of 2.5 were obtained.
Smearing with Webster wire roller (09#), drying in 500 deg.C air-blast oven for 20s, and taking out. The appearance surface of the coating film is uniform and bright, the adhesiveness is good, and the surface resistance is 1260 omega mm2And the corrosion area is about 6% after 8h of the salt spray experiment. The coating was slightly tacky after 6 months of ambient exposure.
Claims (7)
1. A non-oriented electrical steel sheet insulation coating liquid is characterized in that: the main effective components of the coating comprise organic resin, water-soluble dihydric phosphate, silica sol, a coating additive and specific water-soluble metal salt; the mass composition proportion of the components is as follows: 100 parts of organic resin, 100 parts of water-soluble dihydric phosphate, 250 parts of silica sol, 0-100 parts of coating additive, 10-50 parts of specific water-soluble metal salt and the balance of water;
the water-soluble dihydric phosphate is divalent or polyvalent metal dihydric phosphate, and comprises one or more of aluminum dihydrogen phosphate, magnesium dihydrogen phosphate, zinc dihydrogen phosphate, and calcium dihydrogen phosphate;
the specific water-soluble metal salt is a divalent or polyvalent metal salt except the water-soluble dihydrogen phosphate, can stably exist in the dihydrogen phosphate solution, and does not generate precipitate;
the specific water-soluble metal salt comprises carboxylate or nitrate containing hydroxyl, and the carboxylate containing hydroxyl is lactate, citrate, trihydroxy butyrate or gluconate; the metal of the specific water-soluble metal saltThe ion being Mg2+、Zn2 +、Ca2+Or Al3+。
2. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the solid content of the coating liquid is 15-40%.
3. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the anion of the specific water-soluble metal salt can be oxidized or decomposed in the sintering temperature zone of the electrical steel coating, and the metal ion can precipitate dihydric phosphate.
4. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the specific water-soluble metal salt is magnesium lactate, zinc gluconate, magnesium nitrate, calcium citrate, aluminum lactate or magnesium trihydroxybutyrate.
5. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the organic resin can be one or a mixture of more of polyacrylic resin or copolymer thereof, epoxy resin, modified epoxy resin and phenolic resin.
6. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the silica sol is acidic silica sol, and can stably exist in a water-soluble dihydrogen phosphate solution for a long time without generating gel or precipitation.
7. The non-oriented electrical steel sheet insulation coating liquid according to claim 1, wherein: the coating auxiliary agent is one or more of a flatting agent, a film forming auxiliary agent or a defoaming agent.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113831773A (en) * | 2021-11-11 | 2021-12-24 | 上海迪升防腐新材料科技有限公司 | Coating solution for non-oriented silicon steel and preparation method and application thereof |
| CN116144240A (en) * | 2021-11-22 | 2023-05-23 | 宝山钢铁股份有限公司 | Light-viscosity silicon steel environment-friendly insulating paint, silicon steel plate and manufacturing method thereof |
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| CN116144240B (en) * | 2021-11-22 | 2024-04-05 | 宝山钢铁股份有限公司 | Light-viscosity silicon steel environment-friendly insulating paint, silicon steel plate and manufacturing method thereof |
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