Electrically insulating composition

FIELD: cable industry.

SUBSTANCE: invention relates to the cable industry, namely to polymer electrical insulating compositions intended for use in cable structures, operated in conditions of increased fire hazard and low temperatures when exposed to diesel fuel and lubricating oils. Electrically insulating composition contains, by weight: copolymer of butylene phthalate and polybutylene glycol with butylenphthalate (50–95) wt % and polybutylene glycol (5–50) wt % – 20–90, polyethylene wax 1–5, high molecular weight polydimethylsiloxane 2–20, additionally contains aluminum hydroxide Al(OH)3 or magnesium hydroxide Mg(OH)2 100–200, copolymer of ethylene with octene, or ethylene with vinyl acetate, or copolymer of butadiene with acrylonitrile, or copolymer of styrene with butadiene 8–60, high-density polyethylene modified with maleic anhydride 2–20.

EFFECT: technical result – invention makes it possible to provide a high degree of incombustibility, a lower rate of emission of smoke and hydrogen chloride during combustion in combination with increased resistance to diesel fuel and lubricating oils, as well as resistance to low temperatures.

1 cl, 8 tbl, 4 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to composition for covering and solvent formulation. Composition of solvent for enamel for wires, based on polyvinylformal, consisting of ethanol, toluene and dimethylphthalate, and its application for dissolution of enamels for wires and impregnating varnishes. And composition of enamel for wires based on polyvinylformal, including said solvent formulation, method of its obtaining and application for production of winding wires.

EFFECT: invention provides composition of enamel for wires based on cresol-free polyvinylformal, without impairment of enamel working characteristics, as well as solvent, possessing low toxicity and high ability to dissolve coating materials.

5 cl, 6 ex

Power cable // 2547011

FIELD: electricity.

SUBSTANCE: invention is related to power cable intended for transmission and distribution of electric energy, especially electric energy of medium or high voltage. The cable comprises at least one electrical conductor and at least one electric insulating layer surrounding the above electrical conductor, at that at least one electric insulating layer contains: (a) thermoplastic polymer material selected out of at least one propylene copolymer (i) with at least one olefinic comonomer selected out of ethylene and α-olefin except for propylene, at that meting temperature of the above copolymer is 130°C and more and enthalpy of melting is 20-90 J/kg; (b) at least one nano-sized inorganic filler. At that at least one of copolymers (i) represents heterophase copolymer and at least in one insulating layer there is no compatibiliser in essence.

EFFECT: cable possesses advanced electrical performance at maintenance and even improvement of mechanical strength in spite of unavailable compatibiliser for nano-filler.

18 cl, 1 dwg, 7 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to high-frequency composite dielectric materials used in antenna engineering and high-frequency transmission lines. The composite material comprises packed fluoroplast-4 powder with particle size of no more than 5 mcm, impregnated with binder. The binder used is epoxy resin with a curing agent. The epoxy resin is a product of condensation of epichlorohydrin and aniline in an alkaline medium, with viscosity of no more than 200 mPa·s, and the curing agent used has viscosity of no more than 40 mPa·s. Impregnation with binder is carried out under pressure and while evacuating the volume of the powder, followed by curing.

EFFECT: producing a dielectric material with low permittivity, low dielectric loss tangent and improved properties such as strength and modulus of elasticity in compression.

1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to polymer composition for manufacturing sealing and electroinsulating materials for production of connection cable envelope. Composition contains low-pressure polyethylene, lubricant buxol as plasticiser and filling agent representing titanium oxide.

EFFECT: composition is characterised by high thermodynamic compatibility of components, which makes it possible to obtain material with high mechanical characteristics and optimal combination of electro- and hydroinsulating properties.

2 tbl

FIELD: electricity.

SUBSTANCE: electrically insulating composition consisting of suspension polyvinylchloride, ester and, when required, phosphate plasticiser, lead or calcium-zinc stabiliser, antioxidant, antimony oxide, zinc oxide, zinc borate, epoxidated vegetable oil comprises additionally sized aluminium hydrate or magnesium hydrate or their mixture, sized calcium carbonate, sized calcium-magnesium hydroxycarbonate and calcium-aluminium hydroxycarbonate at certain ratio of component.

EFFECT: reduced toxicity, corrosion activity and fume emission.

2 cl, 1 tbl, 1 ex

FIELD: electricity.

SUBSTANCE: invention is related to a cable for transportation and distribution of medium- and high-voltage energy. The cable (1) comprises at least one electrical conductor (2) and at least one electric insulating layer surrounding the above electrical conductor, at that this electric insulating layer (4) contains: (a) thermoplastic polymer material selected from at least one propylene copolymer (i) with at least one olefine comonomer selected from ethylene and α-olefin, not being propylene, at that the above copolymer has melting point higher or equal to 130°C and enthalpy of melting from 20 up to 90 J/g; mixture of at least one copolymer (i) with at least one ethylene copolymer (ii) with at least one α-olefin, at that the above copolymer (ii) has enthalpy of melting from 0 up to 70 J/g; mixture of at least one propylene homopolymer with at least one copolymer (i) or copolymer (ii); at that at least one of copolymer (i) and copolymer (ii) is a heterophase copolymer; (b) at least one dielectric liquid mixed thoroughly with thermoplastic polymer material, at that the above at least one dielectric liquid is aromatic dielectric liquid with the ratio of carbon aromatic atoms number towards the total number of carbon atoms is higher or equal to 0.3; (c) at least one voltage stabiliser selected from substituted bensophenones and hindered amines.

EFFECT: invention improves breakdown strength of the cable dielectric.

20 cl, 2 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to polypropylene, a method for production thereof and a film capacitor made from said polypropylene. The polypropylene has a melting temperature (Tm) measured according to ISO 11357-3 of at least 151.0°C and xylene cold soluble fraction (XCS) of not more than 1.5 wt %. According to stepwise isothermal segregation technique (SIST) results, 45.0 to 67.0 wt % of the crystalline fraction has a lamella thickness in the range of 7.70 to 14.09 nm and 18.0 to 50.0 wt % of the crystalline fraction has a lamella thickness greater than 14.09 nm.

EFFECT: disclosed polypropylene has high heat resistance and enables to obtain biaxially oriented polypropylene (BOPP) and/or a film capacitor with high electrical breakdown strength and a high β parameter.

13 cl, 1 dwg, 9 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a polyolefin composition with improved dielectric strength of insulation, to a wire or cable, in particular to a cable of middle, high or superhigh voltage, which includes such composition, as well as to application of such composition for production of wire or cable, in particular a cable of medium, high and superhigh voltage. Polyolefin composition contains polyolefin (A) and benzyl derivative (B) of a certain structure. Benzyl derivative (B) is used in the polyolefin composition as an additive for stabilisation of dielectric strength.

EFFECT: additive provides considerable improvement of dielectric strength, possesses good solubility in a polyolefin matrix and low predisposition to migration, and also possesses compatibility with respect to all other components of the polyolefin composition, in particular with cross-linking agents.

21 cl, 6 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: electrically insulating composition contains suspended polyvinyl chloride, an ester plasticiser, a lead stabiliser, diphenylol propane, chalk, stearic acid, calcium stearate, epoxidated soya bean oil, magnesium hydroxide, ammonium polyphosphate, chlorinated paraffins, antimony trioxide, zinc oxide, boric acid and organoclay.

EFFECT: low level of smoke emission in burning and glowing conditions while maintaining the degree of incombustibility.

2 cl, 1 tbl

FIELD: electricity.

SUBSTANCE: electric insulating composition includes suspension polyvinyl chloride, ester plasticiser, diphenyl propane, lead stabiliser, stearic acid, lubricating material, epoxidated soya oil, chlorinated paraffin, magnesium hydroxide, ammonia polyphosphate and organic clay.

EFFECT: invention makes it possible to produce a composition with lower combustibility, low release of smoke and hydrogen chloride during combustion, and to increase value of physical and mechanical characteristics.

1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a heat-resistant wire or cable with improved operational properties designed for use in demanding or extreme conditions, for example in well drilling or field development, in industrial, military aerospace, naval fields, as well as in the motorcar, railway and public transport. Such cables can be subjected to extreme temperatures, corrosive substances or atmospheres or fire. The wire or cable comprises a conductor and a polymer sheath consisting of an internal and an external layer. One layer is tape made of polyetheretherketone (PEEK) and has thickness of 5-150 mcm. The second layer is fire-resistant and is made of a siloxane polymer or a polymer based on silicon dioxide as a polymer matrix. The PEEK tape can be combined with a mica layer or a layer which is polymer tape with mica particles.

EFFECT: invention increases fire-resistance of the sheath, its flexibility and resistance to mechanical stress, enables to obtain a wire or cable with a lower weight and diameter.

12 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: electric insulating liquid is proposed, which represents a fluorine-containing dielectric liquid for electric insulation of high-voltage electric equipment, differing by the fact that the dielectric liquid comprises 99.95% of di(octafluoropentyl) ether and 0.05% admixtures of polar gases.

EFFECT: environmental safety, higher efficiency and reliability of operation of high-voltage electric equipment, cheapness and affordability of dielectric liquid.

2 tbl, 1 ex

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 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

FIELD: electricity, chemistry.

SUBSTANCE: electrically insulating polyetherimide siliceous varnish is suggested, composed of polyetherimide siliceous resin, solvent, tetrabutoxytitan and cresol solvent obtained through processing of coal-tar oil and further composed of phenol, o-, m-, p- cresols, and xylenols with the following fractional composition, % (volumetric): below 180°С no more than 3, from 180 to 205°С no less than 70, up to 210°С no less than 85. The technical result achieved by implementing the invention comprises lowering of varhish cost together with improvement of final product quality due to exclusion of expensive tricresol from varhish composition and its replacement by cresol solvent obtained by coal-tar oil processing.

EFFECT: obtained varnish provides for reliable protection of wires with polyetherimide insulation with temperature index of 155.

1 tbl, 9 ex

FIELD: penetration materials.

SUBSTANCE: invention relates to insulating heat-resistant penetration compounds having improved physicochemical characteristics. Proposed compound comprises (wt parts): unsaturated nitrogen-containing polyester (37-39) prepared via polycondensation of unsaturated dicarboxylic acid anhydrides and polyatomic alcohols with N-(β-hydroxyethyl)-1,2-amidodicarboxylic acid; polymerizable diluent (36-128): polycarboxylic acid allyl esters and/or oligoetheracrylates; free-radical initiator (0.8-3.5); polymerization accelerator (0.4-1.6); inhibitor (0.04-0.6); and special additives (0.08-1.0). N-(β-Hydroxyethyl)-1,2-amidodicarboxylic acid is prepared by reaction of 2-aminoethanol and cyclic 1,2-dicarboxylic acid anhydrides. Method of preparing claimed compound is also described. To improve physicomechanical characteristics, additional addition of low-molecular weight epoxide resin in amount of 5-14.5 wt parts per 100 wt parts compound is possible.

EFFECT: reduced viscosity, environmental and fire safety at elevated heat resistance.

3 cl, 7 tbl, 22 ex

FIELD: insulation materials.

SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).

EFFECT: improved performance characteristics.

2 tbl, 13 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

FIELD: electrical engineering; insulating materials for coating enameled wires.

SUBSTANCE: high-temperature surface-active materials used for the purpose are n-tertiary-butyl-phenol-formaldehyde resins. Condensation polymer (polyester, polyester-isocyanurate, polyester-imide, and polyester-amide-isocyanurate) is first synthesized and then dissolved in adequate solvent or set of solvents. Then n-tertiary-butyl-phenol-formaldehyde resins(dropping point 60 - 85 °C) are introduced in prepared varnish in the form of 50% tricresol solutions at temperature of 40 - 60 °C in the amount of 0.5 - 1% and mixed up for 3 - 4 h. Qualitative and quantitative composition of proposed insulating varnish is given in invention specification.

EFFECT: improved spreadability and stability of rheological, physical, and mechanical properties of proposed varnish.

5 cl, 1 tbl, 15 ex

FIELD: electrical engineering; impregnating compounds for paper insulation of power cables.

SUBSTANCE: proposed impregnating compound has 73 - 77 mass percent of petroleum oil and 23 - 27 mass percent of thickening agent; used as the latter is product of thermal copolymerization of C8 - C9 fraction of liquid hydrocarbon pyrolysis. This impregnated compound is characterized in high rheological(viscous) characteristics and high insulating properties retained upon aging in catalyst (copper) environment.

EFFECT: facilitated manufacture, enhanced insulating properties as well as oxidation and aging resistance.

3 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: electrically insulating material for a high-voltage rotary machine consists of a base resin and powdered filler distributed in the base resin as the only filler, which is formed by plate-like aluminium oxide particles, wherein the powdered filler consists of particles with size of 0.002-150 mcm and volume ratio thereof ranges from 50% to 75%, preferably about 70%. The insulating paper for a high-voltage rotary machine contains said electrically insulating material. The insulating tape for a high-voltage rotary machine includes a carrier tape and an insulation paper tape, wherein the insulation paper tape is placed and attached onto the carrier tape.

EFFECT: improved electrically insulating material.

4 cl

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