Electrically insulating lacquer and method for application thereof on metal base

FIELD: chemistry.

SUBSTANCE: invention relates to production of electrically insulating lacquer for coating metal bases. Said lacquer contains (wt %): epoxy-diane resin 7-7.4, polyphenyltetraepoxy siloxane - 2.4-3, alkyd-epoxy resin VEP-0179 - 2.4-3.8, triethylamine - 0.16-0.28, acetone - 20.1-23.6, distilled water - the balance. To apply the lacquer onto a metal substrate, two electrodes - the article-electrode and an auxiliary electrode - are immersed in said lacquer. Positive potential is applied across the article-electrode relative the second auxiliary electrode and with current density of 0.2-1.5 mA/cm2 for 5-15 s, a dense homogeneous electrophoretic film-forming precipitate is electrically deposited on the article-electrode. The article is then placed in a heating cabinet for 30-50 s in which there is a vacuum of 50-60 torr and temperature of 30-40°C. The article is then held in a furnace for 1-1.5 min at temperature of 400-500°C.

EFFECT: inventions reduce emissions of harmful volatile substances, increase mechanical strength and breakdown voltage of the electrical insulation, enable to deposit a dense, homogeneous and quality film layer without using any mechanical devices.

2 cl, 1 tbl, 9 ex

 

The invention relates to polymer chemistry, in particular the production of heat-resistant insulating varnishes for coating metal substrates, for example, copper wires, steel plates, anchors and stators of electric motors, conductors in printed circuit boards, etc.

Known electrical insulating varnishes based on polyester resins. As well known electrical insulating varnish PE-939 [1], which consists of polyester resin, organic solvents, polybutylene.

The disadvantages of this varnish are low resistance and low dry matter content, which leads to emission of a large volume of harmful volatile substances.

Known lacquer UR-9119 UR-9119 [2]. The composition of the varnish UR-9119 includes polyester resin, organic solvents (tricresol, solvent, xylene), the curing agent is a blocked isocyanate, Arizon BBT and curing catalyst.

Disadvantages varnish UR-9119 are low resistance and low mechanical strength of the coating, and low dry matter content and, consequently, a large amount of harmful volatile substances. In addition, to get used in the composition of the locked triisocyanate required scarce and expensive components.

The closest in composition and technical characteristics to offer the varnish lacquer is described in the servant of the ones [3].

Insulating varnish prototype includes polyester, blocked isocyanates, organic solvents tricresol and solvent and a curing catalyst, in addition, it contains a liquid or low-melting polyester and additionally includes epoxy resin, ethylene glycol and glycerin.

The disadvantage of the varnish of the prototype is that it has no electrophoretic properties, so it is applied on the metal base, such as copper wire, uneven layers, each of which is then aligned with the thickness of the mechanical devices, such as gauges. The lacquer is applied in layers (8-10 layers), after each of which it is subjected to a double heat treatment: the first heat treatment is at a relatively low temperature to remove the solvent, and subsequent high-temperature processing - for zepecki (polymerization varnish).

In addition, lacquer-prototype contains a lot of health hazardous organic solvents: tricresol, solvent, glycol.

Known method of applying a lacquer on a metal basis by immersion, after which it mechanically aligned with the surface of the metallic base and the product is coated with a lacquer film is moved into the furnace [4].

The lack of production of enamelled wires immersion is that it is applicable t is like for low-viscosity oil varnishes, which have a high content of film-forming and significantly changing the viscosity in the process of enameling.

The closest technical solution to the claimed is a method that consists of repeated application of the metal based film-forming substance, the alignment film varnish on the surface of the metal substrate mechanical devices after each subsequent deposited layer on the metal base, after each deposited on a metal base layer of lacquer to the metal base coated with a film-forming substance warm for his termsapache, and heat to the metal base down enough for gelatinization of film-forming substances [5].

The disadvantage of the prototype method is that the film time analizowanie on metal base is applied in layers, and each layer level on the substrate surface by mechanical devices. After each application and leveling film her utverjdayut by exposure to thermal energy. This leads to unnecessarily high energy costs. In addition, when applied to the metal base film lacquers are used with a high content of hazardous to the health of people solvents.

Thus, lacquer-prototype and SPO is about prototype require high energy consumption, and highlights in their implementation in the environment environmentally hazardous substances.

The objective of the invention is the reduction of the shortcomings associated with the reduction of energy consumption and emissions of harmful volatile substances into the environment, resulting from the use as solvent of distilled water, simplifying the process of application time analizowanie on metal base, improve the quality and reliability of insulation on a metal basis, by using the proposed lacquer, a new method of its application to metal framework and new modes of treatment.

To solve this problem is proposed lacquer, which includes epoxy resin, polymers and organic solvents, it also contains, as the polymer polyphenylmethylsiloxane, as solvents acetone and distilled water, in addition, it includes alkyd epoxy resin brand VEP-0179, Dianov epoxy resin and triethylamine, the ratio of concentrations of the components lies in the following range of values, wt.%:

alkyd epoxy resin VEP-01792.4 to 3.8
the triethylamineof 0.16 to 0.28
Dianov epoxy7-7,4
polyphenylmethylsiloxane2,4-3
acetone20,1-23,6
distilled waterthe rest,

with the above varnish is prepared in three stages: at the first stage of preparing a foaming agent, which is mixed between the following components, wt%:

alkyd-epoxy2.4 to 3.8
the triethylamineof 0.16 to 0.28
distilled water15-20,

the resulting mixture is stirred at laboratory stirrer with a speed of 240-250 rpm for 1-2 min, and in parallel to the preparation of the mentioned water-soluble film-forming implement the second stage, in which in a separate vessel, prepare the aqueous dispersion of the polymer consisting of the following components, wt%:

Dianov epoxy resin ED-20 epoxy number 20,8%7-7,4
polyphenyleneoxides the San 2,4-3
acetone20,1-23,6
distilled waterthe rest,

the resulting mixture was well dispersed in/on a laboratory stirrer at a speed of about 240-250/min, within 1-2 minutes, then proceed to the third stage of the preparation of the varnish, which is that after these procedures blend both mixtures in the ratio of 1:1 and mixed in the mixer speed 240-250 rpm for 1-2 minutes

The inventive paint after its preparation is applied on a metal substrate, for which it is immersed two electrodes, one of which is the electrode-product, and the other auxiliary electrode serves on the aforementioned electrode-product positive potential relative to the second auxiliary electrode and at a current density of 0.2 to 1.5 mA/cm2within 5-15, electrocardiac product tight uniform electrophoretic film-forming residue, then the electrode-product is recovered from lacquer, placed in a heat chamber, creating in a heating Cabinet vacuum 50-60 Torr and a temperature of 30-40°C, soak the electrode-product at a temperature of 30-50, then remove the above-mentioned electrode-product from the heating Cabinet and placed it on 1-1,5 minutes in the oven, inside which create the tempo is the atur 400-500°C and maintained at the electrode-product within 1-1,5 min, after that, the electrode-product is recovered from the furnace.

The choice of mixing speeds : water-soluble film-forming agent and an aqueous polymer dispersion, as well as additional mixing of these substances at the finishing stage, respectively 240-250 rpm and mixing time within 1-2 minutes, due to pragmatic considerations. When mixing speeds of 240 rpm and mixing time less than 1 minute in the weight of the lacquer does not provide a uniform consistency. When the stirring speed of 250 rpm and mixing time of about 1 minute mass of the varnish becomes a homogeneous consistency, therefore, to increase the speed and time of mixing outside the specified limits is impractical.

The prepared composition is electrophoretic properties and can be applied on metal base method anafarta. For the realization of coating a metal base film specified varnish by electrodeposition, is immersed in the above composition of two electrodes, one of which is covered by the product, and the other auxiliary. Served on the above-mentioned electrode-product positive potential relative to the second auxiliary grounded electrode and at a current density of 0.2 to 1.5 mA/cm2within 5-15, electrocardiac on the electrode-product tight uniform electrophoretic wasp is OK film-forming substance.

In order to reduce energy consumption and increase the efficiency of the method, the electrode-product after deposition is removed from the bath, placed in a heat chamber in which a vacuum of 50-60 Torr and a temperature of 30-40°C, soak the electrode - product at the specified temperature of 30-50 C. Then remove the electrode-product from the heating Cabinet and put it in the oven, inside which creates a temperature of 400-500°C, and after 1-1,5 minutes and the product is recovered from the furnace. The first stage of drying the product under vacuum 50-60 Torr and a temperature of 30-40°C is necessary in order from the varnish film to remove the moisture: water and solvents, as if the film immediately placed in a furnace at high temperature, there will be instant boiling water and solvents, which will lead to numerous local discontinuities of the film, to the emergence of numerous covered and cracks.

The range of dilution in 50÷60 Torr in a heating Cabinet due to the following reasons. It is known that the lower the magnitude of the dilution, the lower the boiling temperature of water and other solvents. For example, when the vacuum 10 Torr water boils at 18°C. However, for low temperatures, boiling water is required to tighten the requirements to tightness of the vacuum heating Cabinet and to the choice of a booster pump, which complicates the application of the method in practice and leads to higher what s the cost of producing the vacuum heating Cabinet. When the negative pressure 50 Torr, the water begins to boil at a relatively low temperature is 30°C. thus there is a gradual evaporation of moisture, without education covered, bubbles and cracks in the film. Getting vacuum at 50 Torr simply is relatively cheap booster pumps and can be obtained without particularly strict requirements to ensure the integrity of the vacuum heating Cabinet. Relatively low boiling temperature of water at a pressure of 50 Torr, the possibility of obtaining the specified dilution cheaper booster pumps and exceptions excessive demands for tightness of the vacuum heating Cabinet indicate inappropriate use of a lower vacuum than 50 Torr. When the negative pressure 60 Torr water contained in the lacquer composition, boils at a temperature of 40°C. Therefore, when creating rarefaction more than 60 Torr will be required to provide boiling water for elecrodeposition film to raise the temperature of the heat, resulting in higher energy costs for heat treatment of the insulating film. After removal of the water from the deposited film on the electrode-the product remains dry tight uniform sediment, which you only need to bake. Therefore, after removal of water from the deposited film electrode, the product is placed in an oven within which create temperature 400-50°C, and after 1-1,5 minutes and the product is recovered from the furnace. Selects the specified temperature in the furnace due to the following reasons. At temperatures below 400°C is the lengthening of the time interval necessary to obtain high quality films. At temperatures exceeding 500°C, the film may have cracks and other defects, leading to reduction of its electrical and mechanical properties. In the specified temperature range 400-500°C, there is an accelerated hardening deposited on the metal film of varnish, while maintaining its quality.

A specific example. Was made a composition with concentrations of components that lie in the following range of values, wt.%:

alkyd epoxy resin VEP-01792.4 to 3.8
the triethylamineof 0.16 to 0.28
Dianov epoxy7-7,4
polyphenylmethylsiloxane2,4-3
acetone20,1-23,6
distilled waterthe rest of it.

The above varnish was prepared in three stages. On the first the stage of preparing a foaming agent, why was mixed between the following components, wt.%

alkyd-epoxy2.4 to 3.8
the triethylamineof 0.16 to 0.28
distilled water15-20.

The received portion of the composition was mixed in a laboratory mixer with a speed of about 240-250/min for 1 min

Parallel to the preparation of the mentioned water-soluble film-forming agent was prepared disperse the polymer in a separate vessel. Aqueous dispersion of a polymer consisted of the following components, wt%:

Dianov epoxy resin ED-20 epoxy number 20,8%7-7,4
polyphenylmethylsiloxane2,4-3
acetone20,1-23,6
distilled waterthe rest of it.

At the third stage, both the mixture prepared in the first two stages, blended together in a ratio of 1:1 was mixed in the mixer speed 240-250 rpm for 1 minute

The prepared composition was applied N. the copper metal substrate by the method of anafarta, to implement the specified method of applying a dielectric composition was immersed in the above composition of two electrodes, one of which was covered by the product, and another subsidiary, filed on the aforementioned electrode-product positive potential relative to the second auxiliary electrode and at current density of 1 mA/cm2within 10 was electrosurgery on the electrode-product tight uniform sludge electrophoretic film-forming substance.

For further development of the inventive method of applying insulating film on the electrode, the product sought to reduce power consumption in the heat deposited film and increase the efficiency of the method. For this purpose, the electrode-product after deposition extracted from the claimed composition and put it in a heat chamber, which created a vacuum of 50-60 Torr and a temperature of 30-40°C. Withstood the electrode-product at the specified temperature for 30-50 C. After which the electrode-product was removed from the heating Cabinet and placed in the oven, inside of which was created by the temperature of 450-500°C and at this temperature was carried out by heat treatment of deposited film within.

The range of dilution in 50÷60 Torr in the vacuum evaporation apparatus due to the following reasons. It is known that the lower the magnitude of the dilution, the lower the temperature is scapania water. For example, when the vacuum 10 Torr water boils at 18°C. However, for low temperatures, boiling water is required to tighten the requirements to tightness of the vacuum evaporation apparatus to the booster pump, which complicates the application of the method in practice and leads to increased cost of manufacture of the vacuum apparatus. When the negative pressure 50 Torr, the water begins to boil at a relatively low temperature is 30°C. Obtaining vacuum at 50 Torr simply is relatively cheap booster pumps and can be obtained without particularly strict requirements to ensure the integrity of the vacuum evaporation apparatus. Relatively low boiling temperature of water at a pressure of 50 Torr, the possibility of obtaining the specified dilution cheaper booster pumps, and exclusions of the excessive demands for tightness of the vacuum evaporation apparatus indicate otherwise removed from the film of water use a lower dilution than 50 Torr. When the negative pressure 60 Torr water boils at a temperature of 40°C. Therefore, when creating rarefaction more than 60 Torr to ensure the evaporation of water from the lacquer film will be required to raise the temperature of the heating elecrodeposition film on the first stage heat treatment to higher values, which leads to povyshayuschayasya costs.

After removal of the water from the deposited film electrode, the product was placed in a furnace within which created the 400-500°C, and after 1-1,5 min, the product was removed from the oven.

Suffered two films of varnish on a copper wire with a diameter of 1 mm and a length of 100 cm On one of the wires was applied varnish is the prototype for the method prototype. The lacquer was applied and mechanically by using appropriate gauges evenly lined up along the length of the wire. Just was applied to 8 layers. After each layer of the lacquer film was subjected to heat treatment. Final film thickness was 40 μm. A similar film thickness was obtained from the claimed varnish by the present method at a current density of 1 mA/cm2, precipitating film-forming on the copper wire within 10 seconds After this film, obtained from the claimed varnish, by the present method, obezvozhivani in a vacuum Cabinet at a pressure of 50 Torr and a temperature of 30°C for 40 sec. After which the wire was placed in the furnace and at a temperature of 450°C was carried out by heat treatment of the film for 1 minute Conductor film made of lacquer-prototype in the prototype method, and the film obtained from the claimed varnish by the present method were subjected to tests which revealed that the film made from the claimed varnish claimed the way, had a dielectric strength of 190 kV/mm, while the film, th is prepared from the varnish of the prototype in the prototype method - only 95 kV/mm, The film made of the claimed varnish according to the present method, was significantly higher than other characteristics: specific volume resistance, resistance to chemical reagents, elasticity and mechanical strength.

To make a conclusion about the achievement of the claimed technical result is to increase the mechanical strength and breakdown voltage of the insulation experiments were carried out to study these parameters in the claimed range of the quantitative composition of the components of the electric insulating varnish.

Table 1 shows experimental data showing the technical result in the claimed range of the quantitative composition of the components of electrical insulating varnish, which can make a conclusion about the achievement of the claimed technical result is to increase the mechanical strength and breakdown voltage of insulation, which are presented in the table.

To test electric strength obtained from the inventive composition using the proposed method of insulating coatings deposited mentioned coating on a copper plate with a length of 50 mm and a width of 10 mm, the thickness of the copper plates was equal to 1 mm After application of the film on said copper plate and its polymerization micrometer was measured thickness plank is, then, using the breakdown of the UPA-10 suited breakdown film in 3 points. The sample was performed using a spherical electrode, with a diameter of 2 mm dielectric strength (breakdown electric field strength (E) was determined by the formula

,

where U is the averaged three-point breakdown voltage of the film, kV,

d is the film thickness, mm

To test the adhesion strength obtained from the inventive composition using the proposed method of insulating coatings deposited mentioned coating on copper wire with a diameter of 1.5 mm.

Adhesion reflects the ability of the insulation of the wire to withstand stretching, winding, bending or twisting without the formation of cracks in the insulation.

For testing films on the adhesion strength of the sample wire in the form of a straight line was reeled ten tight contact with each other coils on the polished rod, with a diameter of 16 mm, the rotational speed of the rod was equal to 2 Hz. The tension of the wire is maintained constant contact wire with terminal. After winding the wire on the rod under the microscope with a 5-fold increase was verified the presence or absence of cracks on the film.

Testing was carried out on three samples, with each of the samples recorded the presence or absence of cracks.

Table 1
CompositesThe composition of the composites, wt.%
123456789
1. Dianov epoxy6,0976,1676,07,397,3976,937,087,14
2. Polyphenylether-amoxicillin2,438to 2.572,43,02,962,8is 3.083,153,17
3. Alkeneamine resin0,0020,0392,32,862,96 2,682,981,050,24
4. Three ethylamine0,00040,00260,180,170,220,280,310,10,016
5. Acetone26,42232,122523,5323,620,1320,020,4520,64
6. Water65,0459,1164,1263,562,8767,166,768,1768,79
Electric strength, kV/mm5565150190190180160 80
Mechanical (adhesion) strength, crackscrackscrackscracksnononocrackscrackscracks
The weight of all components49,201277,83299,88119135,3178,8194,9190,69188,98

Thus, the inventive composition and method have the following advantages over the structure of the prototype and the method of the prototype:

- the claimed composition has electrophoretic properties and its comparison with varnish prototype, can precipitate on the metal base by electrodeposition;

the way the prototype can be applied to the insulating film of the desired thickness of only mechanically by repeated layer-by-layer coating with subsequent mechanical alignment of each layer and its heat treatment, whereas the inventive method allows the floor is W ith a uniform film of a specified thickness without the use of mechanical leveling devices in just one pass with a minimum expenditure of heat on her heat treatment;

- the claimed composition and the inventive method allows to obtain more high-quality film, in particular with the same thickness of the film prepared from the inventive composition according to the present method, the dielectric strength of the specified film more than 2 times higher than the same thickness of the film prepared from the composition of the prototype in the prototype method.

Additional benefits deposition before the standard ways of applying an insulating coating on a metal base, as it follows from the literature, the following:

a) high uniformity of coating thickness and its relative independence from the configuration and dimensions of the product;

b) higher corrosion resistance of the deposited films compared to films obtained in the traditional way;

C) high efficiency at high enough performance;

E. regulation of film thickness by changing the current density or potential;

e) the speed of growth of coatings;

g) the ability to process automation and holding it under normal conditions (room temperature and normal pressure).

Sources

1. The insulating varnish PE-939 THAT 16-504.026-74.

2. Varnish electrosol is ment UR-9119 THAT 16-504.032-75.

3. RF patent №2111994. / Fedoseyev, MS; Spiridonov A.A.; Surkov E; Rabchevsky J.V.; Osipova GT; Suntsova O.N./ Insulating varnish for enameled wires./ Application: 95122362/04. Date of application: 1995.12.26. Published: 1998.05.27 (Prototype).

4. The production of cables and wires: a Textbook for colleges / Neelov, Ramlakan, Atherina and others; Ed. by Neelova and Ibisch. - M.: Energoizdat, 1981. - c.314-319.

5. Peshkov I.K. Magnet wire. M: Energoizdat, 1988, p.113 (prototype).

1. Insulating varnish comprising epoxy resin, polymers and organic solvents, characterized in that it contains as polymer polyphenylmethylsiloxane, and as solvents, acetone and distilled water, in addition, impose alkyd epoxy resin grade VEP-0179, Dianov epoxy resin and triethylamine, the ratio of concentrations of the components of the composition lies in the following range of values, wt.%:

alkyd epoxy resin VEP-01792.4 to 3.8
the triethylamineof 0.16 to 0.28
Dianov epoxy7-7,4
polyphenylmethylsiloxane2,4-3
acetone20,1-23,6
distilled waterthe rest,

with the above varnish is prepared in three stages: at the first stage of preparing a foaming agent, which is mixed between the following components, wt.%
alkyd-epoxy2.4 to 3.8
the triethylamineof 0.16 to 0.28
distilled water15-20,

the resulting mixture is stirred in the stirrer speed 240-250 rpm for 1-2 min, and in parallel to the preparation of the mentioned water-soluble film-forming implement the second stage, in which in a separate vessel, prepare the aqueous dispersion of the polymer consisting of the following components, wt%:
Dianov epoxy resin ED-20 epoxy number 20,8%7-7,4
polyphenylmethylsiloxane2,4-3
acetone20,1-23,6
distilled water the rest,

the aqueous dispersion of the polymer also stirred in a stirrer at a speed of about 240-250/min for 1-2 minutes, then proceed to the third stage of the preparation of the varnish, which is that after these procedures blend both mixtures in the ratio of 1:1 and mixed in the mixer speed 240-250 rpm for 1-2 minutes

2. The method of applying lacquer on a metal substrate, characterized in that the varnish prepared according to claim 1, immersed two electrodes, one of which is the electrode-product, and the other auxiliary electrode serves on the aforementioned electrode-product positive potential relative to the second auxiliary electrode and at a current density of 0.2 to 1.5 mA/cm2within 5-15 electrocardiac product tight uniform electrophoretic film-forming residue, then the electrode-product is recovered from lacquer, placed in a heat chamber, creating in a heating Cabinet vacuum 40-50 Torr and a temperature of 30-40°C, soak the electrode-product at a temperature of 30-50, then remove the above-mentioned electrode-product from the heating Cabinet and put it in the oven, inside which creates a temperature of 400-500°C, and withstand the electrode-product within 1-1,5 min, after which the electrode-product is recovered from the furnace.



 

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20 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of electrically insulating lacquer for coating metal bases. Said lacquer contains (wt %): epoxy-diane resin 7-7.4, polyphenyltetraepoxy siloxane - 2.4-3, alkyd-epoxy resin VEP-0179 - 2.4-3.8, triethylamine - 0.16-0.28, acetone - 20.1-23.6, distilled water - the balance. To apply the lacquer onto a metal substrate, two electrodes - the article-electrode and an auxiliary electrode - are immersed in said lacquer. Positive potential is applied across the article-electrode relative the second auxiliary electrode and with current density of 0.2-1.5 mA/cm2 for 5-15 s, a dense homogeneous electrophoretic film-forming precipitate is electrically deposited on the article-electrode. The article is then placed in a heating cabinet for 30-50 s in which there is a vacuum of 50-60 torr and temperature of 30-40°C. The article is then held in a furnace for 1-1.5 min at temperature of 400-500°C.

EFFECT: inventions reduce emissions of harmful volatile substances, increase mechanical strength and breakdown voltage of the electrical insulation, enable to deposit a dense, homogeneous and quality film layer without using any mechanical devices.

2 cl, 1 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to obtaining electroinsulating varnishes for covering metal bases, for instance, copper wires, starter slots and electric motor armatures, conductors of printed circuit boards, etc. Method of application of electroinsulating coating on metal substrate includes preparation of electrophoretic composition based on varnish PE-939 of grade B, for which purpose it is mixed with 1% ammonia solution, ethylcellosolve and dioxane, after which into prepared electrophoretic solution submerged are two electrodes at distance 10-30 mm, one of which is electrode-product and the other is auxiliary electrode; positive potential relative to second auxiliary electrode is supplied to said electrode-product, and dense homogeneous electrophoretic sediment of film-forming is electrically precipitated on product at current density 2-10 mA/cm2 for 10-20 s, after that, electrode-product is removed from varnish, placed into heat chamber, 50-60 Torr vacuum and temperature 30-40°C are created in heat chamber, and electrode-product is kept at said temperature for 20-40 s, after that said electrode-product is removed from heat chamber and placed into oven, inside which temperature 350-450°C is created, and electrode-product is kept in oven for 60-90 s, after which electrode-product is removed from oven.

EFFECT: method provides increase of quality and exploitation reliability of insulating coating: specific volume resistance, resistance to chemical reagents, elasticity, electric and mechanical strength.

FIELD: metallurgy.

SUBSTANCE: invention relates to chrome-free material for an insulation coating of non grain-oriented electrical steel. Material contains the following components with the corresponding weight fractions: primary acid salt of metal of phosphorus acid in the volume of 100 fractions, epoxy resin in the volume of 10-60 fractions, a drying agent - naphthenate or a drying agent - salt of metal of isooctane acid in the volume of 0.001-10 fractions, an organic solvent in the volume of 0.001-100 fractions and clean water in the volume of 60-2000 fractions. As primary acid salt of metal of phosphorus acid there used is Al(H2PO4)3, Mg(H2PO4)2, Ca(H2PO4)2, Zn(H2PO4)2. As epoxy resin there used is water-soluble epoxy resin or an epoxy resin emulsion.

EFFECT: after chrome-free material of an insulation coating is applied to non grain-oriented electrical steel, it has highly transparent appearance, excellent insulation properties, corrosion resistance, adhesion ability, weldability and processibility, which eliminates demerits inherent in existing chrome-free coatings, for example adhesiveness and bad wear resistance, as well as meets environmental protection requirements.

5 cl, 4 tbl

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering, and more specifically to compositions of insulating coatings and impregnation compounds for windings of electrical machines and mechanisms operated at high temperatures and intended mainly for application of coating by dipping. Impregnating insulating enamel includes polymethylphenylsiloxane lacquer, metal oxides, acrylate copolymer, butyl acetate, silicone antifoamer, rheological additive with thixotropic effect and aromatic solvent.

EFFECT: coatings are obtained with electric strength of enamel film at AC voltage (50 Hz) at temperature of 15-35°C and relative humidity of 45-75% equal to at least 60 kV/mm and specific volume resistance of enamel film in initial state at temperature of 15-35°C relative humidity of 45-75% equal to at least 1,0·1012 Ohm·cm.

1 tbl

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