Impregnating insulating enamel

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 15-35C 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 15-35C relative humidity of 45-75% equal to at least 1,01012 Ohmcm.

1 tbl

 



 

Same patents:

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: 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 30-40C 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 350-450C 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: 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 30-40C. The article is then held in a furnace for 1-1.5 min at temperature of 400-500C.

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 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

FIELD: chemistry.

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

FIELD: chemistry.

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 160C. After extracting water, temperature is raised to 182C 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

FIELD: chemistry.

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

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

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

The invention relates to the field of compositions intended for sealing electrical connectors between the contacts and the insulator

FIELD: chemistry.

SUBSTANCE: invention relates to polymer materials based on organosilicon binder for heat insulation of articles in aircraft building, rocket production, machine building and other industries, which can operate at temperatures of up to 400C. The heat insulation polymer material includes inorganic filler and a polymer matrix based on an organosilicon block-copolymer of a crosslinking agent and a fire retardant. The heat insulation polymer material contains, as the polymer matrix, a siloxane block-copolymer Lestosil-SM of general formula: HO{[C6H5SiO1.5]n[Si(CH3)2O]m}H, where n=30-60, m=80-130, dissolved in butyl acetate in ratio of 100:70, inorganic filler - glass microspheres, crosslinking agent 119-54 class A, fire retardant - montmorillonite nanosilicate, mixed with butyl acetate in ratio of 0.6:30. ` Inorganic glass microspheres of the class MS-VP-A9 group 2l (TU 6-48-91-92) is used as the filler. The crosslinking agent used is a product 119-54 class A (TU 6-02-1281-84). A method of producing the heat insulation polymer material includes mixing a siloxane block-copolymer with nanofiller, a fire retardant and a crosslinking agent, followed by curing and heat stabilisation. When mixing the components, ultrasonic treatment is carried out at frequency of 40-50 kHz and effective power of 250-360 W.

EFFECT: reducing the density of material and smoke emission.

3 cl, 2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to protective coatings. Composition of protective coating includes acryl resin, reactionable polyorganosiloxane or its initial reagent, hexamethyldisiloxane and system of solvents.

EFFECT: invention provides preservation of external looks of coloured surfaces after durative influence of weather conditions, as well as at regular cleaning and washing, in particular leaves "water spots" invisible.

25 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to protective anti-corrosion coatings based on polyorganosiloxanes and is intended for heat insulation and anti-corrosion protection of metal structures. The protective coating composition includes organosilicon polymer binder, metal oxides, aerosil, a silicate, tetraethoxysilane and an organic solvent - o-xylene. The silicate is micromica, microwollastonite and microtalc; the organosilicon polymer binder is polymethylsiloxane resin or polymethylphenylsiloxane resin, or a mixture thereof, or organosilicon lacquer based on polydimethylphenylsiloxane resin.

EFFECT: coating based on the disclosed composition is a natural drying coating, has good physical-mechanical properties with low content of filler in the composition.

4 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to protective coatings, a fastener and other surfaces coated with said coatings, for example, such coatings and fastener, which are capable of protecting one or both of two different metals connected together, from corrosion or damage, such as structural corrosion or decomposition. The corrosion-resistant coating composition includes inorganic salts and an alkaline salt of poly(3-ammonium propylalkoxy siloxane)carboxylic acid (PCAS) as a corrosion inhibitor, suspended in a residue containing a phenol-formaldehyde thermosetting resin. The coating material can be deposited on metal articles, but not limited to an aircraft fastener, such as aircraft fastening components, including nuts and bolts, screws and rivets.

EFFECT: coating does not contain chromate, but is as effective in preventing corrosion as coatings containing chromate.

14 cl, 5 dwg, 2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions having shielding properties, intended for improving electrical containment of detachable flange couplings of microwave devices, especially for on-board equipment. The polymer composition for absorbing high-frequency energy contains synthetic low-molecular dimethylsiloxane rubber SKTN 15-25 pts.wt; absorbing filler - nickel powder PNK-1L5 30-50 pts.wt; cold curing catalyst N18 1.5-2.5 pts.wt.

EFFECT: invention provides low volume resistivity, reduces the curing time of the composition and provides high electrical containment of microwave devices.

2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: claimed invention relates to composition for processing substrate, which contains: a) active material, which has one or more functional groups, which form covalent attachments to complementary functional groups of substrate in presence of acid or base, with active material being selected from the group, consisting of hydrophilic active materials, hydrophobic active materials and their mixtures; b) photocatalyst, capable of generating acid or base under impact of light, with photocatalyst absorbing light in electromagnetic spectrum from infrared region to visible and ultraviolet light, from 1200 nm to 200 nm; and photocatalyst is represented by photoacid, selected from the group, consisting of aromatic hydroxyl compounds, sulfonated pyrene compounds, onium salts, diazomethane derivatives, bis-sulfone derivatives, disulfide derivatives, nitrobenzyl sulfonate derivatives, derivatives of sulfonic acid esters, N-hydroxyimides of sulfonic acid esters and their combinations; and c) carrier for delivering combination of 1(a) and 1(b) elements; with substrates excluding physiological materials. Claimed invention also relates to method of substrate processing (versions).

EFFECT: creation of composition and elaboration of method for modification of substrate surface, which provide long-term conditioning and protective effect.

14 cl, 9 ex, 6 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat protective coatings, intended for constructions and equipment, exploited under temperature conditions from minus 50C to plus 300C, and can be used in construction, machine-building, chemical industry, transport, aviation, oil and gas industry, housing and communal services and other branches of industry. Composition includes hollow ceramic microspheres, binding agent and solvent. as binding agent used are organo-soluble resins - alkyd and/or organosilicon resins, as solvent - xylene and/or toluene. In other version of composition realisation water-soluble acrylic acid is used as binding agent and water is used as solvent. Used microspheres have internal diameter from 3-150 mcm and 0.2-5 mcm thick wall. Microspheres with diameter multiple of wavelength of IR radiation of construction, protected by coating, can constitute 40-60% in the content of microspheres.

EFFECT: obtaining composition to obtain coating with improved heat protective, moisture protective and thermophysical properties, with higher resistance to impact of high temperatures, vibration load and aggressive media, as well as extension of the range of coating working temperatures with provision of low heat conductivity and high homogeneity and strength of adhesion of coating to base in exploitation under severe conditions of higher humidity without additional protection.

8 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: to endow various materials with hydrophilic properties, a modifier is deposited on the surface of said materials. A coating is formed by successively depositing aqueous solution of an oligo(aminopropyl)ethoxysilane of a general formula shown on fig 1, and subsequently depositing aqueous solution of nitrilotrimethylene phosphonic acid of a general formula shown on fig 2. After deposition, each solution is dried on air and heat treated.

EFFECT: invention enables to endow various materials with improved hydrophilic properties.

8 dwg, 6 ex

FIELD: chemistry.

SUBSTANCE: composition comprises liquid low-molecular siloxane rubber, ethylsilicate-40 or tetraethoxysilane as a curing agent, alkoxytitranium borate and vanadium pentoxide. Components are in the following ratio, pts.wt: liquid low-molecular siloxane rubber - 100, ethylsilicate-40 or tetraethoxysilane - 10-30, alkoxytitranium borate - 10-30, vanadium pentoxide - 10-20.

EFFECT: high water-resistance, wear-resistance and fire-resistance of the coating.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: organosilicate composition contains polymethylphenylsiloxane as a binding agent, filling agents - talc and chrome oxide, and disubstituted alumophosphate with a specified ratio.

EFFECT: invention makes it possible to obtain a convenient in exploitation organosilicate composition for protective coating with simple technology of production with high heat resistance, resistance to temperature change in a wide range, with possibility of applying the said composition as heat-resistant glue for alumina ceramics, preserving its high adhesion strength after exposure.

2 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to polymer materials based on organosilicon binder for heat insulation of articles in aircraft building, rocket production, machine building and other industries, which can operate at temperatures of up to 400C. The heat insulation polymer material includes inorganic filler and a polymer matrix based on an organosilicon block-copolymer of a crosslinking agent and a fire retardant. The heat insulation polymer material contains, as the polymer matrix, a siloxane block-copolymer Lestosil-SM of general formula: HO{[C6H5SiO1.5]n[Si(CH3)2O]m}H, where n=30-60, m=80-130, dissolved in butyl acetate in ratio of 100:70, inorganic filler - glass microspheres, crosslinking agent 119-54 class A, fire retardant - montmorillonite nanosilicate, mixed with butyl acetate in ratio of 0.6:30. ` Inorganic glass microspheres of the class MS-VP-A9 group 2l (TU 6-48-91-92) is used as the filler. The crosslinking agent used is a product 119-54 class A (TU 6-02-1281-84). A method of producing the heat insulation polymer material includes mixing a siloxane block-copolymer with nanofiller, a fire retardant and a crosslinking agent, followed by curing and heat stabilisation. When mixing the components, ultrasonic treatment is carried out at frequency of 40-50 kHz and effective power of 250-360 W.

EFFECT: reducing the density of material and smoke emission.

3 cl, 2 tbl, 1 ex

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