Photopolymerizable dielectric composition
(57) Abstract:Usage: electrical insulating coatings for electronics. Essence: photopolymerizable dielectric composition contains, by weight. h: methyl methacrylate 100, a copolymer of 2-10 wt.% methacrylic acid and 90-98 wt.% of butyl methacrylate 2,0-20,0, di(meth)acrylate, di(three)glycol of 0.1-3.0, photoinitiator of 0.1 to 3.0. Mix the components until complete homogeneity at normal temperature. table 1. The invention relates to the field of polymer chemistry, namely to photopolymerizable dielectric compositions (FDC) used in electronic industries for production of lacquer coatings on circuit boards for the purpose of electrical insulation of the components and protect them from external factors.Curing FDC is due to UV exposure. The ultraviolet source is a mercury lamp. Application FDC on the circuit Board and further curing of UV-rays is performed on conveyor lines, therefore, a significant role is played by the exposure time of the compositions under a mercury lamp. The residence time of the circuit boards in the area of UV exposure should be no more than 10 seconds Then the card is removed from the irradiation zone and leave to boatwrights on voobragenie breakdown of not less than 50,000/mm, the thickness of the coating shall be not more than 0,02-0,03 mm in Addition, the coating must be flexible, possess adhesion to copper, tin and steklotekstolity substrates and retain these properties in the temperature range (-60)-(+125)aboutWith, and save dielectric properties after exposure of the coating in the chamber with a humidity of 95% and a temperature of 40aboutWith over 20 day.Known photopolymerized composition  masking the details of the electronic circuit. The composition contains as the film-forming polymer synthetic resin (for example, epoxyacrylate, urethaneacrylate and others), monomerization (for example, etilenglikolevye and others ), photoinitiator (for example, benzyldimethylamine), fotoserial (for example, 6% cobalt naphthenate), the curing agent at room temperature (for example, benzoyl peroxide, methylethylketone and others) and the dye (for example, red iron oxide). The composition is applied with a layer of 1 mm on the surface of the integrated circuit, is subjected to UV irradiation lamp with an intensity of 80 W/cm2within 10 seconds When this occurs, the curing of the surface coating layer, full curing occurs at room temperature for 4 h the resulting coating panotopoulos the nature of the used film-forming polymer, which requires additional use of accelerators UV polymerization and curing at room temperature. In addition, the composition is applied in a thick layer and allow for full otverzhdenija requires a relatively large time.The closest in technical essence to the present invention is photopolymerizable dielectric composition  containing (wt.) film-forming polymer (a mixture of 20-35 acelerando prepolymer urethane, 10-50 unsaturated prepolymer thiolene), 10-40 crosslinking monomer-diluent (N-vinylpyrrolidone), 1-10 photoinitiator (2,2-dimethoxy-2-phenylacetophenone), 4-18 plasticizer and 0.05-0.3 adhesion promoter (organosilane).FDC obtained by mixing the components until complete homogenization for 1 h, and the temperature of the mixture varies from 15 to 20aboutWith, and at the end of cooking FDC better to return to the original temperature, as above 15aboutWith the composition becomes less viscous. In the preparation of the composition are first mixed terenowy prepolymer with hardener, then add a crosslinking monomer-solvent, other components are added to the mixture in any order. Full curing of the coating occurs for mojca. During aging the samples at a temperature of 85aboutC and humidity of 95% within 10 days of the formation of cracks in the coating is not observed, the coating remains flexible, not otlipat from the substrate. Temperature at which the coating retains its properties is -20 to +75aboutC.The disadvantages of the compositions are low dielectric properties (breakdown voltage 1250-1390 In/mm) when the thickness of the coating, a narrow operating temperature and longer time for complete curing. In addition, when preparing FDC must comply with the above order of mixing the components.The aim of the invention is to increase the dielectric properties utverzhdenii composition, extended temperature operation mode and reducing the time its full cure.This objective is achieved in that the photopolymerizable dielectric composition comprising a film-forming, the monomer-solvent, a crosslinking agent and photoinitiator, as contains a film-forming polymer 2-10 wt. methacrylic acid and 90-98 wt. of butyl methacrylate as monomer-diluent methyl methacrylate as a crosslinking agent di(meth)acrylate, di(three)etilogy the iloveu acid
and 90-98 wt. of butyl methacrylate 2,0-20,0
di(three)ethylene glycol 0.1 to 3.0 Photoinitiator 0,1-3,0
The composition may further contain 2-ethyl hexyl acrylate in an amount of 0.1-10 wt.h. as the monomer-diluent and the adhesion promoter, for example methacrylic acid, in the amount of 1-15 wt.h.Obvious effect is the improvement of dielectric properties utverzhdenii composition by reducing the thickness of the coating.As the use of film-forming copolymer of methacrylic acid (2-10 wt.) and butyl methacrylate (90-98 wt.) (OST 6-01-26-75), as a monomer-diluent methyl methacrylate (GOST 20370-74) or its mixture with 2-hexyl acrylate (TU 6-01-1232-80), as photoinitiator mixture (mass ratio 10: 1) benzophenone (MRTU 6-09-1169-64) and michler ketone (MRTU 6-09-6671-70), methyl ether of benzoin (TU 14P-1010-69), 2,2-dimethoxy-2-phenylacetophenone, 2,2-diisopropanolamine, as cross-linking agent dietilenglikoluretan (TU 6-02-10-88), triethylenemelamine, triethylenemelamine - relat (TSS-2-9-88), as protomateria adhesion methacrylic acid (TU 6-01-914-79).The composition is prepared by mixing the components at room temperature until complete homaged, tin, fiberglass once or twice before reaching the coating thickness 0,02-0,03 mm Each layer utverjdayut UV-irradiation of a mercury lamp with an intensity of irradiation of 56 W/m2. Then the substrate is removed from the zone of irradiation and incubated for 1 h (time full otverzhdenija) at room temperature, followed by the determination of dielectric and mechanical properties of the obtained coatings.P R I m e R 1. To 100 wt.h. of methyl methacrylate (MMA) add 7 wt.h. copolymer of methacrylic acid (5 wt. ) and butyl methacrylate (95 wt.) (BMK-5), 1 wt. including a mixture of benzophenone and michler ketone (CF KM), taken in the ratio of 10:1, and 0.25 wt.h. dietilenglikoluretan (DHA). Mixing lead to the complete homogenization of the mixture.Thus prepared VDC applied on the substrate using the applicator and utverjdayut UV rays. Pets applying the composition by spraying, pouring or dipping.To determine the breakdown voltage of the composition is applied on the copper substrate and the determination performed according to GOST 6433.2-71. The elasticity of the coating is determined according to GOST 6806-73, while FDC onto the base of the tin. The adhesion of the coating is determined according to GOST 15140-78.2 steklotekstolity substrate. Temperature dir is sliianie) after alternate premises steklotekstolity substrate coated in cells with low and high temperature. The residence time in each cell is 1 o'clock At operating temperature, take the temperature, which is not observed cracking and peeling of the coating. The moisture resistance of the coating is evaluated according to a change in the value of the breakdown voltage after exposure of the copper substrate with a deposited coating in the humidity chamber for 20 days. The camera is supported by the humidity of 95% and temperature of 40aboutC. Coating water-resistant, if the breakdown voltage of not less than 50,000/mmThe results are given in the table.P R I m m e R 2. The composition is prepared and experienced to example 1, except that to 100 wt.h. MMA add 20 wt.h. copolymer of methacrylic acid (2.) and butyl methacrylate (98 wt.) (BMC-2), 0.1 wt.h. 2,2-dimethoxy-2-phenylacetophenone (DMPAP) and 0.1 wt.h. triethylenemelamine (TGA).The results are given in the table.P R I m e R 3. The composition is prepared and experienced to example 1, except that to 100 wt.h. MMA add 2 wt.h. copolymer of methacrylic acid (10 wt.) and butyl methacrylate (90 wt.) (BMK-10), 3 wt.h. methyl ether, benzoin (OIE) and 3 wt.h. Triethylenetetramine (TBI).The results are given in the table.P the slots (5 wt.) and butyl methacrylate (95 wt.) (BMK-5), 0.5.h. 2,2-Diisopropylamine (DIPF) and 0.25 wt.h. dietilenglikoluretan (DHA).The results are given in the table.P R I m e R 5. The composition is prepared and experienced to example 1, except that to 100 wt.h. MMA add 7 wt.h. 2-ethylhexyl acrylate (2-EGO), 7 wt.h. copolymer of methacrylic acid (4 wt.) and butyl methacrylate (96 wt.) (BMK-4), 1.5 wt.h. BF and KM, 0.3 wt.h. TGA.The results are given in the table.From the results shown in the table, it is seen that using the proposed FDC improve the dielectric properties of the cured coating (the breakdown voltage of more than 50,000/mm), extended operating temperature coatings (from -60 to +125about(C) reducing the thickness of the coating (0.02-0.03 mm), and reduced the full cure time (0.5-1 h). PHOTOPOLYMERIZABLE DIELECTRIC COMPOSITION including a film-forming, the monomer-solvent, a crosslinking agent and photoinitiator, characterized in that, to improve the dielectric properties utverzhdenii composition, extension of the operating temperature of and reduce the time it fully cure, as it contains a film-forming copolymer of 2 to 10 wt. metac the non agent - di(meth)acrylate, di(three)of ethylene glycol in the following ratio, wt.h.The methyl methacrylate 100
The copolymer of 2 to 10 wt. methacrylic acid and 90 to 98 wt. of butyl methacrylate 2,0 20,0
Di(meth)acrylate, di(three)of ethylene glycol 0,1 3,0
Photoinitiator 0,1 3,0
FIELD: building industry.
SUBSTANCE: invention relates to manufacturing acryl resins-base building composition materials used in internal and external finishing of compartments of industrial and civil designation, in particular, in making pouring flooring covers, protective and finishing materials and pouring compounds. Acryl composition for finishing works comprising a binding agent, quarts sand as a filling agent, plasticizing agent, hardening agent and water involves 40-60% aqueous dispersion of copolymer of butylacrylate, methylmethacrylate and methacrylic acid as a binding agent, tributyl phosphate as a plasticing agent, Portland cement M400 as a hardening agent and, additionally, it comprises acryl-urethane thickening agent of associative type "Polifob TR-117" wherein components are taken in the following ratio, wt.-%: 40-60% dispersion of copolymer of butylacrylate, methylmethacrylate and methacrylic acid, 15.0-30.0; acryl-urethane thickening agent of associative type "Polifob TR-117", 0.1-0.2; quartz sand, 35.0-50.0; tributyl phosphate, 0.15-0.25; Portland cement M400, 8-12, and water, the balance. The composition can comprise additionally pigment in the amount up to 11 wt.-%. Invention provides enhancing mechanical strength of cover, its adhesion to surface and decreasing water absorption.
EFFECT: improved and valuable technical properties of composition.
2 cl, 2 tbl
FIELD: chemical industry; polygraphy; methods of the stencil printing.
SUBSTANCE: the invention is pertaining to the paint suitable for the stencil printing inside the pressurized castings. The invention describes the paint suitable for the printing films made out of the transparent thermoplastic, consisting predominantly of: a) one or several pigments; b) the binding in the solution in c) the organic solvent or in the mixture of the organic solvents, d) the routine auxiliary materials, if it is desirable, at that as the binding use the copolymer of the poly-(metha)-acrylate containing (м1) from 50 up to 90 % to the mass of alkylmethacrtlate having from 1 up to 6 atoms of carbon in the ethereal radical; (м2) from 5 up to 25 % to the mass, at least, one vinylaromatic compound; (м3) from 1 up to 25 % to the mass of maleic anhydride, and if it is desirable, (м4) from 0 up to 5 % to the mass of the alkylacrylate having from 1 up to 6 atoms of carbon in the ethereal radical or the copolymer of the poly-(metha)-acrylamide containing polymethylmethacrylate with the degree of imidization from 65 up to 80 %, to 1 up to 15 mass % of methacrylic acid and from 1 up to 15 mass % of methacrylic anhydrade. At that the indicated copolymer has the softening temperature by VIKA (ISO 306 B) at least of 115°С. As the dissolvents use aliphatic, cycloaliphatic and aromatic hydrocarbons, ketones, esters, ethers, alcohols, phenoles or their mixtures. The invention also describes the film made out of the thermoplastic printed by the above described paint; the pressurized casting consisting of the film made out of the thermoplastic printed on the opposite side with the above described paint and supplied on this side with the layer of the thermoplastic coating. At that the indicated layer is applied by the operation of pressure die casting on the inside and at that the film and-or the plastic material for operation of the pressure die casting on the inside represents the copolymer of polymethylmethacrylate; and the method of production of the pressurized castings includes the following stages: a) stencil printing of the thermoplastic films by the above described method, b) the film molding, c) the pressurized castings on the inside on the stencil printed film side in the casting mould with the thermoplastic, and d) removal of the pressurized casting from the casting mould. The technical result of the invention: the paint is resistant to the action of the high pressures and temperatures during the operation of the pressurized casting on the inside, the image stencil printed by the paint has the stable color after long-term action of the atmospheric conditions.
EFFECT: the invention ensures, that the paint is resistant to the action of the high pressures and temperatures during the operation of the pressurized casting on the inside, the image stencil printed by the paint has the stable color after the long-term action of the atmospheric conditions.
6 cl, 1 tbl
FIELD: paint and varnish materials.
SUBSTANCE: invention describes a composition used in decorative finishing and comprising the following components, wt.-%: 20% solution of polymethylmethacrylate in dichloroethane as a film-forming agent, 20.5-23.25; aromatic solvent, 70.5-74.5, and aluminum powder modified with an organic dye by grinding, 4.25-5.0, taken in the ratio = 1:(0.005-0.008). The proposed composition provides decorative effect of cover mimic to mother-of-pearl with good adhesion of the composition on plastics of different chemical nature. Invention can be used in coloring plastics with imitation of mother-of-pearl, in particular, for national consumption goods.
EFFECT: improved and valuable properties of composition.
2 tbl, 2 ex
SUBSTANCE: proposed coating includes a lower layer of an aluminum alloy anodic oxide coating and an upper layer representing a thermo regulating paint coat comprising acrylate holmium-containing vanish "АКГ-1,2" (42-38 percent by weight) and oxide-modified zirconium (IV), 7-4 (58-62 percent by weight). The coating features low solar radiation absorption factor values (As ≤ 0,10-0,11) and high radiation factors (ε≥0,92-0,94). This allows reducing the radiator-emitter area which is particularly important in development of promising spacecrafts. Availability of two thermoregulating coatings, i.e. the anodic oxide and paint coatings allows a notable increase in service life of the said radiators and producing the said coatings on the surface of products made from aluminum or its alloys with lower As/ε parameter values and without drawbacks inherent in silicate coatings.
EFFECT: antirust protection of complicated-design structures and provision of preset thermal-and-radiation characteristics.
SUBSTANCE: invention pertains to water-base lacquer coating materials, meant for depositing on metallic and non-metallic structures in construction, aviation technology and other industries. Description is given of the lacquer coating composition, which contains water-base aryl copolymer "ОЛД-04С" - a product of cohydrolysis of acrylic acid, methacrylic acid, methyl methacrylate, butyl acrylate and calcium (meth)acrylate in quantity of 100 wt %, pigments 50-205.1 wt %, silicone fluid 0.3-0.7 wt %, water 450-550 wt %. The pigments used in the proposed composition are in form of titanium dioxide, blue phthalocyanine pigments, blue anthraquinone, green phthalocyanine, yellow light resistant, red iron oxide, coloured refractory pigments, carbon black and or their mixture. The composition can also contain filler in form of talc, kaolin, modified nano-silicate and or their mixture in quantity of 7-93 wt %, and melamine phosphate in quantity of 1-5 wt % as a fire retarding agent.
EFFECT: proposed lacquer coating composition provides for good rheological properties, in particular good opaqueness, high water resistance and freeze resistance with retention of adhesive and physical and mechanical properties.
SUBSTANCE: invention relates to adhesive lacquer for polyvinylchloride and can be used for depositing images on polyvinylchloride with subsequent deposition of coating varnish. The adhesive lacquer contains a synthetic resin - copolymer of methylmethacrylate with Tglass=124 °C and dynamic viscosity of the solution in toluene equal to 1500 mPa s, a volatile solvent - methyl ethylketone and toluene and an antistatic additive EFKA 6780 ("EFKA" Degussa).
EFFECT: reduced stickiness and increased binding power.
1 tbl, 4 ex
SUBSTANCE: acrylic paint composition in the first version contains an acrylic film-forming - acrylic organosoluble copolymer Polyform and a copolymer of p-butylmethacrylate with methylmethacrylate, silica filler, thickener - benton or pangel, plasticiser - phthalic ester, pigment and organic solvent. In the second version the acrylic paint composition contains an acrylic film-forming - acrylic organosoluble copolymer Polyform and a copolymer of p-butylmethacrylate with methylmethacrylate and additionally a polyorganosiloxane resin, silica filler, thickener - benton or pangel, plasticiser - phthalic ester, pigment and organic solvent.
EFFECT: improved physical and mechanical properties.
2 cl, 2 tbl
SUBSTANCE: acrylic lacquer contains an acrylic copolymer dispersion Primal AC-4800ER, a coalescent additive Nexcoat NX-795, a wax additive Aquacer 502, Orotan 681 dispersant, a polyurethane thickener Acrisol RM-2020, a neutraliser - 20% aqueous ammonia solution, an antifoaming agent Nopko NXZ, a preservative Kathon LXE and water.
EFFECT: with the given combination of components, the acrylic lacquer is characterised by good working characteristics and forms a high-lustre transparent coating on wooden articles.
2 tbl, 4 ex
SUBSTANCE: disclosed is a novel photopolymer acrylic oligomer-oligomer composition consisting of a bifunctional oligomer, an oligomer with functionality higher than 2, a monomer, a methyl methacrylate oligomer with molecular weight 20000-70000 and a polymerisation initiator, with the following ratio of components in pts.wt: acrylic bifunctional oligomer 15-95; acrylic oligomer with functionality higher than 2 15-70; acrylic monomer 0-25; methyl methacrylate oligomer with molecular weight 20000-70000 5-20; photopolymerisation initiator 0.1-1.0. Disclosed is a wear-resistant coating on organic glass, obtained via photochemically initiated three-dimensional radical polymerisation of the disclosed composition. Disclosed is a method of producing a wear-resistant coating on organic glass, involving a step for preparing a photopolymeric acrylic oligomer-oligomer composition and a step for curing thereof. The technical result is endowing resistance to formation of microcracks during ablation (silver resistance), low shrinkage and high adhesion to a coated substrate obtained via photopolymerisation of acrylic oligomer-oligomer compositions.
EFFECT: invention enables to obtain wear-resistant protective coatings on organic glass with surface hardness close to that of sapphire crystals.
7 cl, 6 tbl, 19 ex
SUBSTANCE: invention can be used in producing integrated microcircuits and other electronic devices which use a planar manufacturing technique based on photolithographic processes. The composition for photoactivated etching of silicon dioxide films includes a polymer base - polymethyl methacrylate, a photosensitive component - ammonium fluoride in trifluoroacetic acid solution, a solvent - acetone, a protophilic agent - diphenylamine.
EFFECT: invention simplifies the process of producing a photoetched pattern on a silicon layer, increases the rate of photoetching and significantly reduces defects in the obtained articles.
1 tbl, 4 ex
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyesteramide resin cresol solvent, petroleum solvent, and tetrabutoxytitanium, said cresol solvent being the one recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyester resin, titanium catalyst, and organic solvents, titanium catalyst being, in particular, tetrabutoxytitanium and organic solvents being petroleum solvent and cresol solvent recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
SUBSTANCE: there is disclosed insulating coating composition, containing bitumen in amount 90-100 wt fractions, fluorocarbon polymer 32 LN in amount 10-15 wt fractions, butyl acetate in amount 40-45 wt fractions, acetone in amount 40-45 wt fractions and mica in amount 2-3 wt fractions.
EFFECT: improved insulating properties, mechanical strength and chemical stability.
1 tbl, 1 ex
SUBSTANCE: varnish contains a varnish base, a functional additive which increases coating hardness, siccative HF and methyl ethyl ketoxime radical polymerisation inhibitor. The varnish base is an oligomer with strongly polar chromane rings. The oligomer is obtained by reacting tung oil and 101L phenol-formaldehyde resin, taken in equivalent ratio of 1:0.15-0.18, respectively, while heating said mixture for 60 minutes at temperature 160°C. After extracting water, temperature is raised to 182°C until achieving viscosity of 25-36 s. The oligomer is added to the composition in 50% xylene solution. The functional additive used is rosin ester with glycerine. Components are in the following ratio, wt %: oligomer - 31.0-36.2, rosin ester with glycerine - 9.0-3.8, siccative HF - 2.00, methyl ethyl ketoxime - 0.60, xylene - the balance.
EFFECT: wider raw material base, replacing molten amber, which is not produced on an industrial scale, with rosin ester with glycerine, high content of non-volatile substances, elasticity and electrical strength of the coating.
1 tbl, 2 ex
SUBSTANCE: invention relates to use of nanomaterials in wire enamel for improving thermal properties of enamel. The nanomodified wire enamels are usually used in making insulated winding wire. The polymer base of wire enamel is selected from a group comprising polyamideimide, polyester, polyesterimide, polyurethane and mixtures thereof. The nanomaterial is selected from a group comprising nano-oxides, metal nano-oxides, metal oxides or hydroxides of aluminium, tin, born, germanium, gallium, lead, transition metals, lanthanides, actinides and mixtures thereof. The nanomaterial is also selected from a group comprising nano-oxides, metal nano-oxides, metal oxides and hydroxides of aluminium, silicon, titanium, zinc, yttrium, vanadium, zirconium, nickel and mixtures thereof. After applying enamel on the wire and curing thereof, the wire exhibits improved thermal and mechanical properties.
EFFECT: improved thermal properties of enamel.
8 cl, 6 tbl
SUBSTANCE: invention can be used in producing wires with enamel insulation for motors, coils and transformers. The wire enamel contains binder, an organic solvent, auxiliary substances and additives, an adhesion promoter selected from imidazole, pyrrolidone, amidocarboxylic acids, derivatives thereof and mixtures thereof. The method of coating electric wires with the enamel involves providing an electric wire, applying the enamel and curing.
EFFECT: improved adhesion of the enamel to electric wires.
20 cl, 9 ex
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
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.
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
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.