CN101659799B - Electric steel insulating paint, and preparation method and coating method thereof - Google Patents
Electric steel insulating paint, and preparation method and coating method thereof Download PDFInfo
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- CN101659799B CN101659799B CN2009101955339A CN200910195533A CN101659799B CN 101659799 B CN101659799 B CN 101659799B CN 2009101955339 A CN2009101955339 A CN 2009101955339A CN 200910195533 A CN200910195533 A CN 200910195533A CN 101659799 B CN101659799 B CN 101659799B
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Abstract
The invention relates to an electric steel insulating paint, and a preparation method and a coating method thereof. The electric steel insulating paint is prepared from the following components by mass percent: 25-65% of aluminium dihydrogen phosphate, 0.5-3% of silica sol, 1-5% of phosphoric acid, 1-5% of magnesium oxide, 0.1-1% of nitrate additive containing rare earth, 1-5% of silane coupling agent and the balance water as a solvent. The thickness of the electric steel insulating paint is 0.3-8 mu m. The electric steel insulating paint has the advantages of favorable insulating property, favorable coating performance, high interface resistance, high breakdown resistance, high corrosion resistance, high adhesion property and the like. The environmental-protection insulating paint does not contain chromium, and thereby being clean and having no pollution. In addition, the electric steel insulating paint also has the advantages of rich material sources, low cost, high performance price ratio, strong market competitiveness and wide application prospects.
Description
Technical field
The present invention relates to field of metal surface treatment, more specifically, the present invention relates to a kind of electric steel insulating paint, its preparation method and coating method.Said electric steel insulating paint can be used for making nothing orientation or the oriented silicon steel that various motors, X-former, ballast iron core and various electric elements are used, electric steel insulating paint of the present invention and preparation method thereof have good insulation performance property, coating property, higher interlamination resistance, and higher resistance wear performance, environmental-protecting performance, tack etc.
Background technology
Silicon content is that 0.5%～4.5% utmost point low-carbon ferrosilicon alloy is commonly referred to as silicon steel, and silicon content is called the low-carbon (LC) electrical sheet less than 0.5% ultra-low carbon steel plate, and both are referred to as electrical sheet.Electrical steel is the extremely low silicon-iron soft magnetic alloy of a kind of carbon content, and it is mainly used in makes phonomoter, generator, transformer core and various telecommunication apparatus.The demand of electrical steel is directly proportional with generated energy substantially, and the capacity of installed generator of planning along with China increases sharply, and because of China's grid equipment is aging, transforming electrical network needs a large amount of high-quality X-formers, and China's electrical steel demand will continue to increase.
The iron loss of electrical steel is to weigh a leading indicator of electrical steel product performance.Iron loss (PT) mainly comprises magnetic hysteresis loss, eddy-current loss, unusual loss three parts.When making motor, household electrical appliance and transformer core, need the electrical sheet punching be become the stock of core configuration, through argon arc welding and hot-cast aluminium the chip edge of the pre-determined quantity of folding is fixed.Therefore; The essential insulating coating that applies one deck very thin (0.5～5 μ m) in siliconized plate surface, the electric steel insulating coating also needs excellent punching property, weldableness, tack, chemical-resistant resistance stability and pile pieces coefficient etc. except that having insulativity; So that siliconized plate has higher interlamination resistance rate; Siliconized plate interlayer power loss is reduced to minimum, makes siliconized plate in storage, transportation and use, avoid the erosion of various corrosive mediums simultaneously, prevents corrosion; The outward appearance homogeneous, surface hardness is moderate, does not peel off at post-treatment process floating coat, efflorescence, and is little to the processing mold wearing and tearing; Have good heat-resistant, still have higher interlamination resistance rate etc. through high temperature annealing and after turning blue.
Electrical steel coatings divides three major types, organic coating, half inorganic coating and inorganic coating both at home and abroad.
The organic coating film forming properties is good, has better punching processibility, but also exists many unsurmountable shortcomings, thick coating (10～15 μ m), and weldableness is poor, iron core pile pieces coefficient low (92%); The coating heat-shrinkable is big, and iron core is prone to loosening, poor dimensional stability; Coating hardness low (generally about 0.9); Toxicity is big, and price is high, is prone to cause waste and environmental pollution; Interlamination resistance is with moving reduction gradually etc., and organic coating can not satisfy the pyritous requirement and be eliminated gradually.
Inorganic coating has excellent thermotolerance, insulativity and weldableness, but punching processibility, tack are poor.Half inorganic coating then is organic substance to be joined improve punching processibility, tack in the inorganic paint; Simultaneously, the thermotolerance and the weldableness that obtain through the control organic content.This coating has the hardness of film height, and heat-shrinkable is little, and dimensional stability is good, good heat resistance, and water is solvent, and is environment friendly and pollution-free.On the other hand, half inorganic coating also exists can not solve the problem that the organic composition pyrolytic decomposition lost efficacy, and the volatilization meeting of organic composition simultaneously pollutes to environment.
That uses now is mainly two types of inorganic coating and half inorganic coatings.Wherein inorganics is mainly phosphoric acid salt, chromic salt, silicate etc.; Organic resin is homopolymer or multipolymer of vinyl resin, vinyl acetate resin, acid modified alcoholic resin and epoxy resin etc. etc.
In addition; The insulation compound of current a large amount of uses all contains chromic salts for improving its solidity to corrosion; Dichromate toxicity is big; Pollution is heavy, and human body and environment are caused harmful effect, and the foreign technology that the electric steel insulating paint of many domestic well-known enterprises is introduced in one's early years also contains chromic salt; This has caused the great attention of countries in the world, and for example European Parliament and board of management issued that RoHS instructs regulation Europe to contain chromic electronic electric equipment in complete prohibition on July 1st, 2006 and circulates in the European market on January 23rd, 2003.
For replacement contains the chromium insulation compound, people have carried out big quantity research to chromium-free environment-friendly type insulation compound.U.S. Armocol company is inorganic at the siliconized plate of Europe and ground application such as China, the organic coating patent of invention has related to a kind of partly inorganic chrome-free insulating coating aqueous suspension that can apply at non-oriented silicon steel sheet, can be used to make the insulation layer with resistivity between high level.This coating comprises 20～60 parts monoaluminum phosphate, 20～70 parts at least a inorganic silicate particulate, 10～25 parts vinyl resin and an amount of water-miscible organic solvent.This coating resistance to chalking, weldableness, tack, interlamination resistance rate and chemicalstability etc. are all better.
The chromium-free water-based masking liquid of siliconized plate that domestic production is at present used exists some problems: at first be that the inorganic composition ratio is less in the non-volatile material of masking liquid is formed, generally account for solid ingredient 10～35% between.The inorganic composition ratio is few, and the outward appearance of coating is good, and the punching performance is good; But the resistance to elevated temperatures of coating is poor, and it is a lot of that the interlamination resistance value is reduced, and insulating property greatly reduce; And cause carburizing easily, even discrete causes that also high temperature annealing workshop section catches fire.Next is that weldableness is poor, and welding speed does not reach requirement.Also there is the rustless property of some coatings not reach requirement in addition, easily dry linting.These drawbacks limit the use range of siliconized plate, must overcome and improve.
For example; Publication number is that " CN101029196 ", number of patent application are applied for a patent for the China of " a kind of electrical steel topcoating " of Baoshan Iron & Steel Co., Ltd for " 200610024190.6 ", application people; Disclose a kind of electric steel insulating paint with good adhesion, its technical scheme is: the weight percent of moity is: the dichromate 34～60% of divalent metal, resin emulsion 7～15%; Organic reducing agent 1～3%, boric acid 30～55%.Wherein resin is vinyl acetate resin or vinyl resin, and organic reducing agent is terepthaloyl moietie or USP Kosher, the dichromate of divalent metal: resin=100: (15～25), the density that finally is coated with feed liquid is controlled at 1.00～1.20g/m
2
This patented claim technology mainly solves the existing not good enough technical problem of coating tack; Not wearing performance with regard to insulativity, higher interlamination resistance and higher resistance has what to break through, and this patented claim technology fails to solve environmental issue because of the dichromate that uses divalent metal.
In addition, existing electrical steel dope is applicable to HRS more.And cold rolling electric has plurality of advantages, obviously is being superior to the hot rolling electrical steel aspect dimensional precision, the surface quality; Interior aspect the magnetic; Even the two iron loss is suitable; Still than the high 0.14～0.15T of magnetic strength of hot rolling electrical steel, this can make, and required magneticstrength obviously reduces the magnetic strength of cold rolling electric in same working point, for condition has been created in minimizing coil turn, the consumption of reduction copper cash.And under identical iron loss, the magnetizing current of cold rolling electric magnetic strength is little, and the motor copper loss is few, thereby power is improved.
The hot rolling electrical steel leans on uneven anodized insulation, and there is insulation layer on the cold rolling electric surface, and no matter smooth finish or planeness all are superior to the hot rolling electrical steel, and insulating reliability, insulation resistance are much bigger, can reduce eddy losses thus, reduce core loss.Thereby substitute the hot rolling electrical steel with cold rolling electric and become trend.
For example, the horse steel has been developed a kind of non-oriented electrical steel and has been used the M21 environment friendly insulating coating, and this environment friendly insulating coating is a kind of half organic coating, mainly is made up of vinyl resin and mineral filler, has excellent insulating property.This environment friendly insulating coating with phosphoric acid and white lake be raw material at 90～100 ℃ of synthetic dimerization tricresyl phosphate hydrogen aluminium, with water glass, oxalic acid joins in the dimerization tricresyl phosphate hydrogen aluminum solutions and is prepared into the masking liquid that viscosity is 0.16～0.2Pas by-certainty ratio.In the electrical steel surface-coated of cleaning, behind the seasoning 12h, obtain high-temperature insulation coating at 600 ℃ of thermal treatment 1min with dip-coating method through lehre.With X-ray diffraction analysis (XRD), DTA (DTA), thermogravimetric analysis (TG) and microscopic study coating form to change.Characterized the insulating power of coating with Franklin method (Franklin method) burn-out test.The result shows: phosphoric acid and white lake ratio are that 3.3: 1 o'clock generation dimerization tricresyl phosphate hydrogen aluminium productive rates are the highest, and performance is the most stable.The adding of water glass both can be strengthened coating's adhesion, can improve the dispersiveness of masking liquid again.The adding of sequestrant is stablized coating and is deposited.Coating is 300 ℃ of stable uses, and maximum operation (service) temperature can reach 600 ℃.The about 800 Ω mm of interlamination resistance
2/ sheet.
But said half inorganic coating can not solve the problem that the organic composition pyrolytic decomposition lost efficacy, and the volatilization meeting of organic composition simultaneously pollutes to environment.
The environment-friendly type coating that does not contain chromium has been invented in order to overcome the shortcoming that contains chromium half inorganic coating by company of Nippon Steel, Amoca Corp.That is: inorganic solution phosphagel phosphaljel (product of compound such as white lake and phosphatase reaction): the Al of 100 parts of these solution
2O
3: H
3PO
4The amount of substance ratio be 0.13～0.3.Less than 0.13, free phosphoric acid is many, and the baking drying is that water absorbability is bad; Greater than 0.3 o'clock, phosphagel phosphaljel itself was unstable, was prone to from solution, separate out.Reach 6～50 parts organic resin; Organic resin is selected one or more for use in vinylformic acid, vinylbenzene, vinyl acetate between to for plastic, Vilaterm, Vestolen PP 7052, polymeric amide, polycarbonate, trimeric cyanamide, epoxy resin; The polymer of these materials, crosslinked body all can use, and also can add materials such as aluminium sesquioxide, titanium oxide as required; Vitrifying agent such as phosphorous acid, water glass and other inorganic additive are to guarantee high thermal resistance, insulativity.With half inorganic solution for preparing, on annealed wire, control coated weight to be coated with baking dry with the roller that is coated with of trough of belt.But the insulating coating weight optimum range that forms on the electrical steel surface is 0.5～4.0g/m
2Between, weight is less than 0.5g/m
2The time, punching property can not get guaranteeing; Weight size 4.0g/m
2The time, insulating coating has the danger of being stripped from during stress relieving.
USP 2 793 073 has disclosed a kind of insulating coating that is used to apply electrical steel.The organic moiety of coating is by being selected from one or more of vinyl resin or multipolymer, Maleic Acid, Anhydrous, polyvinyl acetal, aminoresin, calcium lignosulfonate, resol, vinyl acetate, vinylchlorid and epoxy resin.Can add the organic granular material of granularity greater than 2 μ m, for example: resol, melamine resin wait provides surface irregularity, and obtaining good weldableness, the inorganic part of coating can comprise in phosphoric acid class material or the chromic acid class material one or more.Phosphoric acid class material can comprise a kind of phosphoric acid salt of calcium, magnesium, zinc, and titanium oxide, glue alms bowl silicon-dioxide, aluminum oxide and boric acid.Chromic acid class material can comprise a kind of dichromate of calcium, magnesium, zinc, and titanium oxide, colloidal alumina and a kind of organic reducing agent.The electrical steel that this usefulness half inorganic coating applies has good punching processibility and preservative property.But; The resin volatilization can produce too much pore in the welding processing process; The welding pore that produces for the volatilization that makes in this process because of resin is reduced to minimum, needs in phosphoric acid salt, the exhausted coating of chromic salt, add particle, but in the punching course of processing, also has powder phenomenon-tion.Moreover, because this type coating contains the solubility sexavalent chrome and becomes chromic salt, thereby, the processing of the coating of coating, coated steel plates, use and the disposal process of useless coating liquid in can produce the problem aspect the environmental pollution of safety and high price.
For this reason, need a kind of environment-friendly type semi-inorganic insulation coating that is used for cold-rolled orientation or non-oriented electrical steel of development especially.This environment-friendly type coating can provide surface of good resistivity; Make the interlayer power loss reduce to minimum; Good anti-water vapor receptivity is arranged, the tack good with surface of steel plate is provided, minimum in the die wear that from the process of steel plate punching system lamination, is caused; Do not produce excessive efflorescence or on pressing equipment, do not cause the accumulation of coating at the lamination punching course, annealing and carbon drop processing can meet with stresses.In addition, require the said environment-friendly type semi-inorganic insulation coating that is used for cold rolling non-oriented electrical steel not produce too much welding pore, can be when making iron core employed various pharmaceutical chemicalss and resin compatible.And, do not contain solubility sexavalent chrome or chromic salt, avoiding to the pollution of environment and electrical steel processing, in the use to the infringement of operator's health.
Summary of the invention
For overcoming the problems referred to above; The objective of the invention is to; A kind of electric steel insulating paint is provided; Said electric steel insulating paint can be used for making nothing orientation or the oriented silicon steel that various motors, X-former, ballast iron core and various electric elements are used, and particularly, can be used for making cold rolling non-orientation or the oriented silicon steel that various motors, X-former, ballast iron core and various electric elements are used.Electric steel insulating paint of the present invention and preparation method thereof have good insulation performance property, coating property, higher interlamination resistance, and higher resistance wear performance, environmental-protecting performance, tack etc.
The object of the invention is again; A kind of preparation method of electric steel insulating paint is provided; Said electric steel insulating paint preparation method can be used for making the nothing orientation that various motors, X-former, ballast iron core and various electric elements use or the environmental protection insulation compound of oriented silicon steel; Particularly, can be used for making cold rolling non-orientation or the oriented silicon steel environmental protection insulation compound that various motors, X-former, ballast iron core and various electric elements are used.The electric steel insulating paint that makes by method of the present invention have good insulation performance property, coating property, higher interlamination resistance, and higher resistance wear performance, environmental-protecting performance, tack etc.
The object of the invention is again, and a kind of coating method of electric steel insulating paint is provided.
For achieving the above object, the technical scheme of electric steel insulating paint of the present invention (SSC-Chromfree) is following:
A kind of electric steel insulating paint, said electric steel insulating paint is formulated by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent.
According to electric steel insulating paint of the present invention, adopt aluminium dihydrogen phosphate as the coating main ingredient, have excellent insulating property, can effectively improve the MS performance of siliconized plate, help improving the coating adhesion property.
According to electric steel insulating paint of the present invention, add the electromagnetic performance that silicon sol helps improving siliconized plate.Natural manganese dioxide and phosphoric acid also can improve coating insulation performance and thermotolerance.Employing contains rare earth nitrate additive instead chromic salts, improves corrosion resistance nature.
According to electric steel insulating paint of the present invention, silane coupling agent is used for the coupling mineral filler, strengthens adhesive property, improves machinery, electric, water-fast, the anti-corrosion and ageing resistance of product.
According to electric steel insulating paint of the present invention, preferably, the aluminium dihydrogen phosphate of said electric steel insulating paint component is 25%～65%, said silicon sol 0.5%～3%.
According to electric steel insulating paint of the present invention, preferably, the aluminium dihydrogen phosphate of said electric steel insulating paint component is 30%～40%.
According to electric steel insulating paint of the present invention, preferably, phosphatase 11 .5%～3.5% of said electric steel insulating paint component, said Natural manganese dioxide 1.5%～3.5%.
According to electric steel insulating paint of the present invention, preferably, said electric steel insulating paint component contain rare earth nitrate additive 0.3%～1.5%, said silane coupling agent 2%～4%.
According to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, the proportioning of said conjugate solutions is:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
Boric acid: 0.5～5%,
Nitric acid: 0.5～5%,
All the other are aqueous solvent.
According to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate, and prepares saidly when containing the rare earth nitrate additive solution, and the proportioning of said conjugate solutions is:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
All the other are aqueous solvent.
According to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on the individual constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 4～7%,
Superoxide: 4～7%,
Boric acid: 3～5%,
Nitric acid: 3～5%,
All the other are aqueous solvent.
According to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on the individual constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 4～7%,
Superoxide: 4～7%,
All the other are aqueous solvent.
According to electric steel insulating paint of the present invention, preferably, said rare earth nitrate is selected from more than one of Yttrium trinitrate, cerous nitrate, zirconium nitrate.
According to electric steel insulating paint of the present invention, preferably, said rare earth nitrate is cerous nitrate and Yttrium trinitrate, and the quality mixture ratio of cerous nitrate and Yttrium trinitrate is at 4-7: 6-3.
According to electric steel insulating paint of the present invention, preferably, said superoxide is selected from more than one of peroxo-water, sodiumperoxide, Potassium peroxide 85, Magnesium Superoxol, calcium superoxide, peroxide of barium.
According to electric steel insulating paint of the present invention, preferably, said superoxide is the title complex of peroxo-water and sodiumperoxide, and the quality mixture ratio of peroxo-water and sodiumperoxide is at 4-8: 6-2.
According to electric steel insulating paint of the present invention; Preferably; Said silane coupling agent is selected from γ-(2; The 3-propylene oxide) propyl trimethoxy silicane (WD60), vinyltriethoxysilane (WD20), 1,2-two (Trimethoxy silane ethane) are (26M) and one or more mixture of the hydrolyzate of γ-An Bingjisanyiyangjiguiwan (WD50).
According to electric steel insulating paint of the present invention; Preferably, said silane coupling agent is γ-(2, the 3-propylene oxide) propyl trimethoxy silicane (WD60) and 1; The mixture of two (Trimethoxy silane ethane) hydrolyzates (26M) of 2-; Said γ-(2, the 3-propylene oxide) propyl trimethoxy silicane (WD60) and 1, the mass mixing ratio of two (Trimethoxy silane ethane) hydrolyzates (26M) of 2-is at 2-7: 8-3.
For achieving the above object, the preparing method's of electric steel insulating paint of the present invention (SSC-Chromfree) technical scheme is following:
A kind of preparation method of electric steel insulating paint is characterized in that, said method comprises following operation:
(1) with Natural manganese dioxide and phosphatase reaction, fully stir and add little solvent water to reacting completely, Natural manganese dioxide all dissolves;
(2) phosphate dihydrogen aluminum solution 25%～65% is mixed with silicon sol solution 0.5%～3%;
(3) solution that obtains of above-mentioned two steps of thorough mixing fully stirs 1h, stirs to add little solvent water simultaneously;
(4) slowly adding contains rare earth nitrate additive 0.1%～2%, stirs while adding, until being dissolved as homogeneous phase fully;
(5) slowly add silane coupling agent 1%～5%, stir while adding, until being dissolved as homogeneous phase fully;
(6) 200 mesh filter screens filter resulting solution;
(7) fixed dissolving stirs and promptly forms above-mentioned electric steel insulating paint.
Said electric steel insulating paint is following by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent.
According to the preparation method of electric steel insulating paint of the present invention, adopt aluminium dihydrogen phosphate as the coating main ingredient, have excellent insulating property, can effectively improve the MS performance of siliconized plate, help improving the coating adhesion property.
According to the present invention, add the electromagnetic performance that silicon sol helps improving siliconized plate.Natural manganese dioxide and phosphoric acid also can improve coating insulation performance and thermotolerance.Employing contains rare earth nitrate additive instead chromic salts, improves corrosion resistance nature.
According to the preparation method of electric steel insulating paint of the present invention, silane coupling agent is used for the coupling mineral filler, strengthens adhesive property, improve product machinery, electric, water-fast, anti-corrosion be ageing resistance.
According to the preparation method of electric steel insulating paint of the present invention, preferably, the aluminium dihydrogen phosphate of said electric steel insulating paint component is 30%～60%, said silicon sol 0.8%～2%.
According to the preparation method of electric steel insulating paint of the present invention, preferably, the aluminium dihydrogen phosphate of said electric steel insulating paint component is 30%～40%.
According to the preparation method of electric steel insulating paint of the present invention, preferably, phosphatase 11 .5%～3.5% of said electric steel insulating paint component, said Natural manganese dioxide 1.5%～3.5%.
According to the preparation method of electric steel insulating paint of the present invention, preferably, said electric steel insulating paint component contain rare earth nitrate additive 0.6%～0.8%, said silane coupling agent 2%～4%.
Preparing method according to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
Boric acid: 0.5～5%,
Nitric acid: 0.5～5%,
All the other are aqueous solvent.
Preparing method according to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
All the other are aqueous solvent.
Preparing method according to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 4～7%,
Superoxide: 4～7%,
Boric acid: 3～5%,
Nitric acid: 3～5%,
All the other are aqueous solvent.
Preparing method according to electric steel insulating paint of the present invention; Preferably; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 4～7%,
Superoxide: 4～7%,
All the other are aqueous solvent.
According to the preparation method of electric steel insulating paint of the present invention, preferably, said rare earth nitrate is cerous nitrate and Yttrium trinitrate, and the quality mixture ratio of cerous nitrate and Yttrium trinitrate is at 4-7: 6-3.
According to the preparation method of electric steel insulating paint of the present invention, preferably, said superoxide is selected from more than one of peroxo-water, sodiumperoxide, Potassium peroxide 85, Magnesium Superoxol, calcium superoxide, peroxide of barium.
According to the preparation method of electric steel insulating paint of the present invention, preferably, said superoxide is the title complex of peroxo-water and sodiumperoxide, and the quality mixture ratio of peroxo-water and sodiumperoxide is at 4-8: 6-2.
According to the preparation method of electric steel insulating paint of the present invention, preferably, the said rare earth nitrate of said electric steel insulating paint component is selected from more than one of Yttrium trinitrate, cerous nitrate, zirconium nitrate.
Preparing method according to electric steel insulating paint of the present invention; Preferably; Said silane coupling agent is selected from γ-(2; The 3-propylene oxide) propyl trimethoxy silicane (WD60), vinyltriethoxysilane (WD20), 1 ,-two (Trimethoxy silane ethane) are (26M) and a kind of or mixture more than two kinds of the hydrolyzate of γ-An Bingjisanyiyangjiguiwan (WD50).
Preparing method according to electric steel insulating paint of the present invention; Preferably, said silane coupling agent is γ-(2, the 3-propylene oxide) propyl trimethoxy silicane (WD60) and 1; The mixture of two (Trimethoxy silane ethane) hydrolyzates (26M) of 2-; Said γ-(2, the 3-propylene oxide) propyl trimethoxy silicane (WD60) and 1, the mass mixing ratio of two (Trimethoxy silane ethane) hydrolyzates (26M) of 2-is at 2-7: 8-3.
The object of the invention is to provide a kind of coating method of electric steel insulating paint again, and the coating method according to electric steel insulating paint of the present invention is characterized in that, earlier siliconized plate is passed through oil removing, alkali cleaning, acid etching, washing successively before applying; On electrical steel, apply the said electric steel insulating paint that aforesaid method makes; Said coating processes is roller coating; Solidification value is 300～400 ℃, and the residence time is 60s～240s; Forming thickness is the electric steel insulating paint of 0.3～8 μ m.
According to electric steel insulating paint of the present invention, its preparation method and coating method, have good insulation performance property, coating property, higher interlamination resistance, and higher resistance wear performance, solidity to corrosion, tack etc.The environment-friendly type insulated dope of the present invention's development does not contain chromium, cleanliness without any pollution.In addition, electric steel insulating paint raw material sources of the present invention are abundant, and cost is lower, have excellent cost performance, and the market competitiveness is strong, has broad application prospects.
Embodiment
Below, referring to table one, lift specific embodiment and specify electric steel insulating paint of the present invention.
Embodiment 1
In following ratio, prepare electric steel insulating paint of the present invention:
Al(H
2PO
4)
3 30％，
SiO
2Colloid 1%,
H
3PO
4 3％，
MgO 4％，
Contain rare earth nitrate additive 1%,
Silane coupling agent WD60 2%,
Silane coupling agent 26M 1%,
All the other are deionized water.
In the present embodiment; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Said rare earth nitrate is the mixture of cerous nitrate and Yttrium trinitrate, and the quality mixture ratio of said cerous nitrate and Yttrium trinitrate was at 7: 3.
In the present embodiment, said superoxide is selected from the title complex of peroxo-water and sodiumperoxide, and the quality mixture ratio of said peroxo-water and sodiumperoxide was at 8: 2.
Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 7%,
Superoxide: 7%,
Boric acid: 3%,
Nitric acid: 4%,
All the other are aqueous solvent.
Process for preparation is following:
With Natural manganese dioxide 4% and phosphoric acid 3% reaction, fully stir and add little solvent water to reacting completely, Natural manganese dioxide all dissolves;
Phosphate dihydrogen aluminum solution 30% is mixed with acidic silicasol solution 1%;
The solution that above-mentioned two steps of thorough mixing obtain fully stirs 1h, stirs to add little solvent water simultaneously;
Slowly add and contain rare earth nitrate additive 1%, stir while adding, direct at and be dissolved as homogeneous phase fully;
Slowly add silane coupling agent WD60 and 26M totally 3%, stir while adding, direct at and be dissolved as homogeneous phase fully;
200 mesh filter screens filter resulting solution;
Fixed dissolving stirs and promptly forms above-mentioned electric steel insulating paint..
Earlier that siliconized plate is dry through the electrical sheet after the pre-treatment through oil removing, alkali cleaning, acid etching, UW washing etc. successively before applying).On electrical steel, apply about the said electric steel insulating paint 0.5 μ m that aforesaid method makes with roller painting.Toast 60s～100s down at 350 ℃, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 1050 Ω mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 11h.
Embodiment 2
Except following difference, other prepare electric steel insulating paint of the present invention as embodiment 1, and on electrical sheet, apply:
Al(H
2PO
4)
3 25％，
SiO
2Colloid 1.5%,
H
3PO
4 4％，
MgO 5％，
Contain rare earth nitrate additive 0.2%,
Silane coupling agent WD20 2%,
All the other are aqueous solvent.
In the present embodiment; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Said rare earth nitrate is the mixture of cerous nitrate and zirconium nitrate, and the quality mixture ratio of said cerous nitrate and zirconium nitrate was at 6: 4.
In the present embodiment, said superoxide is selected from the title complex of peroxo-water and Magnesium Superoxol, calcium superoxide, and the quality mixture ratio of said peroxo-water and Magnesium Superoxol, calcium superoxide was at 8: 1: 1.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 10%,
Superoxide: 5%,
Boric acid: 5%,
Nitric acid: 2%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 1 μ m with roller painting, at 380 ℃ of baking 100s～150s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 800 Ω mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 9h.
Embodiment 3
Except following difference, other prepare electric steel insulating paint of the present invention as embodiment 1, and on electrical sheet, apply:
Al(H
2PO
4)
3 40％，
SiO
2Colloid 2%,
H
3PO
4 5％，
MgO 1％，
Contain rare earth nitrate additive 0.4%,
Silane coupling agent 26M 4%,
All the other are aqueous solvent.
In the present embodiment, the rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate, and said rare earth nitrate is a cerous nitrate.
In the present embodiment, said superoxide is selected from the title complex of sodiumperoxide and Magnesium Superoxol, calcium superoxide, and the quality mixture ratio of said sodiumperoxide and Magnesium Superoxol, calcium superoxide was at 4: 3: 3.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 4%,
Superoxide: 8%,
Boric acid: 5%,
Nitric acid: 2%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 0.5 μ m with roller painting, at 320 ℃ of baking 150s～200s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 920mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 7h.
Embodiment 4
According to above prepared coating and on electrical sheet, apply:
Al(H
2PO
4)
3 45％，
SiO
2Colloid 2.5%,
H
3PO
4 1％，
MgO 2％，
Contain rare earth nitrate additive 0.6%,
Silane coupling agent WD50 3%,
All the other are aqueous solvent.
In the present embodiment, the rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate, and said rare earth nitrate is a cerous nitrate.
In the present embodiment, said superoxide is selected from the title complex of peroxo-water and peroxide of barium, and the quality mixture ratio of said peroxo-water and peroxide of barium was at 5: 5.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 2.5%,
Superoxide: 8%,
Boric acid: 0.6%,
Nitric acid: 4%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 1.5 μ m with roller painting, at 400 ℃ of baking 60s～80s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 850 Ω mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 14h.
Embodiment 5
Except following difference, other prepare electric steel insulating paint of the present invention as embodiment 1, and on electrical sheet, apply:
Al(H
2PO
4)
3 55％，
SiO
2Colloid 3%,
H
3PO
4 3.5％，
MgO 3.5％，
Rare earth nitrate 0.8%,
Silane coupling agent WD60 3%,
Silane coupling agent WD50 1%,
All the other are aqueous solvent.
In the present embodiment, the rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate, and said rare earth nitrate is a cerous nitrate.
In the present embodiment, said superoxide is selected from the title complex of peroxo-water and peroxide of barium, and the quality mixture ratio of said peroxo-water and peroxide of barium was at 3.5: 6.5.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 8%,
Superoxide: 8%,
Boric acid: 5%,
Nitric acid: 0.6%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 3 μ m with roller painting, at 300 ℃ of baking 200s～240s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 1100mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 11h.
Embodiment 6
Except following difference, other prepare electric steel insulating paint of the present invention as embodiment 1, and on electrical sheet, apply:
Al(H
2PO
4)
3 63％，
SiO
2Colloid 2.5%,
H
3PO
4 1.5％，
MgO 3％，
Contain rare earth nitrate additive 0.8%,
Silane coupling agent WD20 5%,
All the other are aqueous solvent.
In the present embodiment; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate; Said rare earth nitrate is the mixture of cerous nitrate and strontium nitrate, and the quality mixture ratio of said cerous nitrate and strontium nitrate was at 4: 6.
In the present embodiment, said superoxide is selected from the title complex of peroxo-water and Magnesium Superoxol, and the quality mixture ratio of said peroxo-water and Magnesium Superoxol was at 5: 5.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 10%,
Superoxide: 10%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 7 μ m with roller painting, at 380 ℃ of baking 100s～150s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
Estimate the insulativity of insulating coating through measuring interlamination resistance value (Franklin method).Resistance value is 800 Ω mm between this coat layer
2/ 0.5 μ m (dry film).
Form the erosion resistance that yellow hot spot required time is estimated insulating coating in the neutral salt spray test case through being determined at.Yellow hot spot appears in this coating first behind 10h.
Embodiment 7
Except following difference, other prepare electric steel insulating paint of the present invention as embodiment 1, and on electrical sheet, apply:
Al(H
2PO
4)
3 40％，
SiO
2Colloid 0.5%,
H
3PO
4 5％，
MgO 1.5％，
Contain rare earth nitrate additive 0.8%,
Silane coupling agent 5%,
All the other are aqueous solvent.
In the present embodiment, the rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate, and said rare earth nitrate is Yttrium trinitrate and zirconium nitrate.The Yttrium trinitrate of said rare earth nitrate and the proportioning of zirconium nitrate are 5: 5.
In the present embodiment, said superoxide is selected from peroxo-water.
In the present embodiment, said silane coupling agent is γ-(2, the 3-propylene oxide) propyl trimethoxy silicane (WD60), vinyltriethoxysilane (WD20), and the mixture of γ-An Bingjisanyiyangjiguiwan (WD50).Its blending ratio is 3: 3: 4.
In the present embodiment, prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning that contains rare earth nitrate additive solution quality of said cooperation:
Rare earth nitrate: 10%,
Superoxide: 8%,
Boric acid: 5%,
Nitric acid: 2%,
All the other are aqueous solvent.
The electrical sheet that will pass through after the pre-treatment is dry, applies the coating about 5-8 μ m with roller painting, at 350 ℃ of baking 150s～200s down, can observe the electrical steel surface and form evenly colourless film, still can see the metalluster of steel disc.
In the above-described embodiments, the concrete processing requirement of each flow process is following:
(1) aluminium dihydrogen phosphate is chosen general industrial level product, can effectively improve the solid content of coating, guarantees the various aspects of performance of coating.
(2) Natural manganese dioxide and phosphoric acid should react completely, and unreacted magnesium oxide precipitation should be released in order to avoid influence coating quality.
(3) contain the rare earth nitrate additive and should be controlled to be acidity, in order to avoid generate deposition.
(4) each component should keep hydrolysising balance in the silane coupling agent, in order to avoid the unstable deposition that generates.
(5) each component must be sequentially added into and constantly stir, otherwise can't produce a desired effect.
(6) pre-treating technology that applies, coating method, solidification value, be its important technical parameters set time, should maintain in the process parameters range.
Table one
| Raw material (massfraction %) | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 |
| Aluminium dihydrogen phosphate | 30 | 25 | 40 | 45 | 55 | 63 | 40 |
| Silicon sol | 1 | 1.5 | 2 | 2.5 | 3 | 2.5 | 0.5 |
| Phosphoric acid | 3 | 4 | 5 | 1 | 3.5 | 1.5 | 5 |
| Natural manganese dioxide | 4 | 5 | 1 | 2 | 3.5 | 3 | 1 |
| Contain the rare earth nitrate additive | 1 | 0.2 | 0.4 | 0.6 | 0.8 | 0.8 | 0.8 |
| Silane coupling agent | WD60:2 26M:1 | WD20:2 | 26M:4 | WD50:3 | WD60:3 WD50:1 | WD50:4 | WD60:1.5 WD20:1.5 WD50:2 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
Electric steel insulating paint of the present invention have good insulation performance property, coating property, higher interlamination resistance, and higher resistance wear performance, solidity to corrosion, tack etc., the environment-friendly type insulated dope of the present invention's development does not contain chromium, cleanliness without any pollution.In addition, electric steel insulating paint raw material sources of the present invention are abundant, and cost is lower, have excellent cost performance, and the market competitiveness is strong, has broad application prospects.
Claims (10)
1. electric steel insulating paint, said electric steel insulating paint is formulated by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent;
The said rare earth nitrate additive that contains is the solution that rare earth nitrate and superoxide cooperate; Said rare earth nitrate is selected from more than one of Yttrium trinitrate, cerous nitrate, zirconium nitrate; Prepare saidly when containing the rare earth nitrate additive solution, the proportioning of the mass percent of said conjugate solutions is:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
All the other are aqueous solvent.
2. electric steel insulating paint as claimed in claim 1 is characterized in that, the aluminium dihydrogen phosphate of said electric steel insulating paint component is 30%～60%, said silicon sol 0.8%～2%.
3. electric steel insulating paint as claimed in claim 1 is characterized in that, phosphatase 11 .5%～3.5% of said electric steel insulating paint component, said Natural manganese dioxide 1.5%～3.5%.
4. electric steel insulating paint as claimed in claim 1 is characterized in that, said electric steel insulating paint component contain rare earth nitrate additive 0.6%～1.2%, said silane coupling agent 2%～4%.
5. electric steel insulating paint as claimed in claim 1; It is characterized in that; The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, the proportioning of the mass percent of said conjugate solutions is:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
Boric acid: 0.5～5%,
Nitric acid: 0.5～5%,
All the other are aqueous solvent.
6. like claim 1 or 5 described electric steel insulating paints, it is characterized in that said superoxide is selected from more than one of peroxo-water, sodiumperoxide, Potassium peroxide 85, Magnesium Superoxol, calcium superoxide, peroxide of barium.
7. electric steel insulating paint as claimed in claim 1; It is characterized in that; Said silane coupling agent is for being selected from γ-(2; The 3-propylene oxide) propyl trimethoxy silicane (WD60), vinyltriethoxysilane (WD20), 1, the mixture of one or more of the hydrolyzate of two (Trimethoxy silane ethane) (WD 26M) of 2-and γ-An Bingjisanyiyangjiguiwan (WD50).
8. the preparation method of an electric steel insulating paint is characterized in that,
Said method comprises following operation:
(1) with Natural manganese dioxide 1%～5% and phosphatase 11 %～5% reaction, fully stir and add little solvent water to reacting completely, Natural manganese dioxide all dissolves;
(2) phosphate dihydrogen aluminum solution 25%～65% is mixed with silicon sol solution 0.5%～3%;
(3) solution that obtains of above-mentioned two steps of thorough mixing fully stirs 1h, stirs to add little solvent water simultaneously;
(4) slowly adding contains rare earth nitrate additive 0.1%～2%, stirs while adding, until being dissolved as homogeneous phase fully;
(5) slowly add silane coupling agent 1%～5%, stir while adding, until being dissolved as homogeneous phase fully;
(6) 200 mesh filter screens filter resulting solution;
(7) fixed dissolving, stirring promptly forms electric steel insulating paint,
Said electric steel insulating paint is following by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent;
The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and superoxide cooperate, and prepares saidly when containing the rare earth nitrate additive solution, based on each constituent mass proportioning of said conjugate solutions quality is:
Rare earth nitrate: 1～10%,
Superoxide: 1～10%,
All the other are aqueous solvent.
9. the preparation method of an electric steel insulating paint is characterized in that,
Said method comprises following operation:
(1) with Natural manganese dioxide 1%～5% and phosphatase 11 %～5% reaction, fully stir and add little solvent water to reacting completely, Natural manganese dioxide all dissolves;
(2) phosphate dihydrogen aluminum solution 25%～65% is mixed with silicon sol solution 0.5%～3%;
(3) solution that obtains of above-mentioned two steps of thorough mixing fully stirs 1h, stirs to add little solvent water simultaneously;
(4) slowly adding contains rare earth nitrate additive 0.1%～2%, stirs while adding, until being dissolved as homogeneous phase fully;
(5) slowly add silane coupling agent 1%～5%, stir while adding, until being dissolved as homogeneous phase fully;
(6) 200 mesh filter screens filter resulting solution;
(7) fixed dissolving, stirring promptly forms electric steel insulating paint,
Said electric steel insulating paint is following by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent;
The rare earth nitrate additive that contains of said electric steel insulating paint component is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate; Prepare saidly when containing the rare earth nitrate additive solution, be based on each constituent mass proportioning of said conjugate solutions quality:
Rare earth nitrate: 4～7%,
Superoxide: 4～7%,
Boric acid: 3～5%,
Nitric acid: 3～5%,
All the other are aqueous solvent.
10. the coating method of an electric steel insulating paint is characterized in that, earlier electrical steel is passed through oil removing, alkali cleaning, acid etching, washing successively before applying; Roller coating applies above-mentioned electric steel insulating paint on electrical steel; Solidification value is 300～400 ℃, and the residence time is 60s～240s; Forming thickness is the electric steel insulating paint layer of 0.3～8 μ m;
Said electric steel insulating paint is formulated by following component by mass percent:
Aluminium dihydrogen phosphate: 25%～65%,
Silicon sol: 0.5%～3%,
Phosphoric acid: 1%～5%,
Natural manganese dioxide: 1%～5%,
Contain the rare earth nitrate additive: 0.1%～2%,
Silane coupling agent: 1%～5%,
All the other are aqueous solvent,
The said rare earth nitrate additive that contains is the solution that rare earth nitrate and boric acid, nitric acid and superoxide cooperate, or the said rare earth nitrate additive that contains is the solution that rare earth nitrate and superoxide cooperate.
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| CN2009101955339A CN101659799B (en) | 2009-09-11 | 2009-09-11 | Electric steel insulating paint, and preparation method and coating method thereof |
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