(57) Abstract:The invention relates to electrical engineering, in particular compositions for the manufacture of coatings for electrical steels for magnetic circuits of electrical machines and devices. The technical result - the creation of the dielectric composition with increased resistance to dual abrasion when impregnated with water insulating coatings while maintaining high physical-mechanical properties. This object is achieved in that on the electrical steel sheet is applied a composition comprising a butadiene-styrene latex with a ratio of butadiene and styrene in the copolymer of 35:65 wt.%, phosphoric acid, magnesium oxide, aluminum hydroxide, boric acid and surfactant in the following ratio, wt.%: the butadiene-styrene latex 23-26,2, phosphoric acid 30,5-36,1, polyoxyethylene ether or ethoxylated monoalkylphenols based trimers of propylene 1,35-1.55V, magnesium oxide 2,7-3.5, aluminum hydroxide 1,44-2,22, boric acid of 0.21-0.31 in water up to 100. The use of the proposed composition can improve the quality of insulation coating to increase resistance to dual abrasion when impregnated with water Ponoi humidity. table 1. The invention relates to electrical engineering, in particular compositions for the manufacture of coatings for electrical steels for magnetic circuits of electrical machines and devices.Known insulating composition to obtain a coating for electrical steel using manifestatio binder [Khain I. I. Theory and practice of phosphating of metals. - L.: Chemistry, 1973]. The disadvantages of this structure are low physico-mechanical properties of insulating coatings.Closest to the claimed invention is a composition of [the patent of Russian Federation N 2096849, 20.11.97, bull. 32], which contains, wt%:
46 - 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35:65 wt.% - 18-36
phosphate ions (in terms of P2O5or - 7,24-15,8
phosphoric acid - 10-21,8
polyoxyethylene ether - 1,8-3,6
the aluminum ions (Al3+or - 0,1-0,3
the aluminum hydroxide - 0.29 to 0.87 for
magnesium ions (Mg2+or - 0,22-1,1
magnesium oxide - 0,37-1,8
ions of boron (in terms of B2O3or - 0,012-0,088
boric acid - 0,02-0,16
water up to 100
The disadvantage of this composition is the low stability of the Oia is the creation of the dielectric composition with increased resistance to dual abrasion when impregnated with water insulating coatings while maintaining high physical-mechanical properties.This object is achieved in that on the electrical steel sheet is applied a composition comprising a butadiene-styrene latex with a ratio of butadiene and styrene in the copolymer of 35 : 65 wt.%, phosphoric acid, magnesium oxide, aluminum hydroxide, boric acid and surfactant in the following ratio, wt.%:
the butadiene-styrene latex - 23 - 26,2
phosphoric acid - 30,5 - 36,1
polyoxyethylene ether or ethoxylated monoalkylphenols based trimers of propylene - 1,35 - 1.55V
magnesium oxide - 2,7 - 3,5
the aluminum hydroxide - 1,44 - 2,22
boric acid - 0,21 - 0,31
water up to 100
The composition is prepared by direct mixing of the butadiene-styrene latex, polyoxyethylene ether or polyoxyethylene monoalkylphenols-based propylene trimer, phosphoric acid, magnesium oxide, aluminum hydroxide, boric acid and water. The viscosity of the OT-4 at 20oC 13-20 seconds. In all examples, the samples of isotropic electrical steel were processed for 5 seconds at a temperature of 205oC. the Excess solution was removed by squeezing rubber rollers. The coating was subjected to heat treatment at a temperature of 500oC for 60 CE is P CLASS="ptx2">Physico-mechanical properties of the coatings is determined by the Flexural strength, water resistance and moisture absorption. Bending strength is determined by bending the samples on a cylindrical mandrel with a diameter of 3 mmMethods for determination of moisture absorption and moisture resistance are described in the book caracino M. I. tests of paints and coatings. - M.: Chemistry, 1988The compositions of the insulating compositions and properties of coatings based on them are given in table 1.As can be seen from the table, the introduction of the butadiene-styrene latex, phosphoric acid, polyoxyethylene ether or polyoxyethylene monoalkylphenols-based propylene trimer, magnesium oxide, aluminum hydroxide, boric acid in the amount above and below the declared concentration (see examples 4,8,9,13,14,18,19,23,24,28,29,33) leads to the decrease of resistance to dual abrasion when impregnated with water and the deterioration of their physical and mechanical properties.Example 34 characterizes the properties of the coatings obtained on the prototype.This goal is achieved by the combination of all the characteristics claimed in the solution.The use of the proposed composition can improve the quality of the insulation politicii rolled electrical steel in conditions of high humidity. Insulating composition containing styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35 : 65 wt.%, phosphoric acid, magnesium oxide, aluminum hydroxide, boric acid and a surfactant, characterized in that it contains as a surfactant polyoxyethylene ether or ethoxylated monoalkylphenols based trimers of propylene in the following ratio, wt.%:
The butadiene-styrene latex - 23 - 26,2
Phosphoric acid - 30,5 - 36,1
Polyoxyethylene ether or ethoxylated monoalkylphenols based trimers of propylene - 1,35 - 1.55V
Magnesium oxide - 2,7 - 3,5
The aluminum hydroxide - 1,44 - 2,22
Boric acid - 0,21 - 0,31
Water Up To 100
FIELD: electronic engineering; gas panel manufacture.
SUBSTANCE: protective coating that can be used for manufacturing contact members of gas-panel strip conductors is formed on both sides of polyamide and applied by stenciling method using for the purpose dielectric composition resistant to 20-30% alkali solutions at temperature of 65 - 85oC that incorporates in its composition ethyl cellulose in the amount of maximum 9 parts by weight and organic solvent in the amount of minimum 91 parts by weight with boiling temperature of ≥ 190oC, minimal amount of ethyl cellulose and maximal amount of organic solvent being, respectively, 7.5 and 92.5 parts by weight.
EFFECT: improved rheological and protective properties of coating using proposed composition.
1 cl, 1 ex
FIELD: marking materials.
SUBSTANCE: invention relates to pigmentation and compositions for use in laser marking, in particular UV absorbing pigment at least partly covered with synergist having general formula [Rm(SiOn)]pR'q wherein m=1-3, n=1-3, p is a number equal to at least 1, q=0-3, and at least one of R or R' represents substituent. When pyrolized, pigment forms black material appropriate to form label. Such pigments are suitable for fluoropolymers serving to insulate wire conductors and cables.
EFFECT: expanded marking possibilities.
20 cl, 6 tbl, 38 ex
FIELD: electrical engineering.
SUBSTANCE: proposed insulating material that can be effectively used to insulate conductors for various industries, including radio engineering, cable industry, microelectronics, and the like, has multilayer structure of N thin-film layers, where N > 1; all layers are made of separate piled films produced from same material and by same method, having actually equal thickness d < 25 μm.
EFFECT: facilitated manufacture, reduced cost of materials used, enhanced electric and mechanical strength.
1 cl, 1 dwg, 2 tbl
SUBSTANCE: invention is attributed to the field of electric engineering specifically to epoxide thin filling compounds used for electric insulating and reinforcing by means of embedding of high-voltage power supply units, transformers, electric circuitry, uncased and cased electric couplers, for sealing and protecting elements of radio-electronic devices against moisture and mechanical impacts. Composition for filling compound with moderate initial viscosity contains 30-36 wt-p. of epoxide diane resin, 12-20 wt-p. of threeglycid polyoxypropylene triol ether, 10-12 wt-p. of monoglycid n-butanol ether, 18-22 mass-p. of low-polymeric polyamid resin and 7-10 wt-p. of aliphatic amine.
EFFECT: creation of electric insulating filling compound composition keeping resiliency not less than for an hour, having high specific volume, high value of surface electric resistance and increased elasticity.
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: 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
SUBSTANCE: coating comprises an adhesive sublayer of a thermoplastic adhesive and a functional layer of a nanostructured composite material based on polyethylene. The composite material of the functional layer has a polyethylene matrix and montmorillonite particles dispersed in the matrix in amount of 0.1-2 wt %.
EFFECT: improved physical and mechanical properties of the coating.
12 cl, 2 ex
SUBSTANCE: compound casting method for electrical goods includes mixing of components with receipt of the compound and casting of the electrical goods with the compound. At that before casting an electrical good is heated at temperature of 50-55°C and residual pressure of 10-15 mm hg at least during 3 hours. The compound is received by mixing of predried components in the following ratio, g: styrene - 50, castor oil - 38, product 102T - 12, benzoyl peroxide paste - 1. The paste made by mixing of predried benzoyl peroxide with dibutyl phthalate is used as the benzoyl peroxide paste. At that before casting the compound is vacuumised additionally at temperature of 15-35°C and residual pressure of 10-15 mm hg at least during 3-5 minutes. The pretreated electrical goods and compound are heated in the same furnace at temperature of 70°C during 1 hour. Then the heated electrical goods are casted step by step with the hot compound by the free casting method initially to ѕ of the electrical good height or volume with further vacuum degassing of the casted electrical goods at temperature of 15-35°C and residual pressure of 10-15 mm hg during 15-20 minutes with further casting of the electrical good with the same compound up to the required level. The multistage polymerisation of the compound is carried out. At that the casted electrical goods are held in the furnace heated up to 70°C during 4 hours at first, then they are casted with the same compound and its polymerisation takes place again at temperature of 70°C during 4 hours.
EFFECT: non-availability of defects in the form of cracks and air bubbles in the compound mass thus ensuring high quality of the casted electrical goods, and namely increasing their electric strength and reducing quantity of wastes.
FIELD: electrical engineering.
SUBSTANCE: method of production of power cable including conductor and ply of polymer coat. This method comprises the steps whereat polypropylene matrix is mixed with dielectric fluid to obtain polymer mix. Hydrodynamic pressure of said mix is increased. Polymer mix is filtered. Said polymer mix is forced through extrusion head to get coat ply on conductor and cable is cooled.
EFFECT: decreased amount of contaminants, process with sufficient rate.
13 cl, 3 dwg
SUBSTANCE: proposed material represents a glass fibre and is manufactured using glass cloth impregnated with a mixture of epoxy-diane resin, 4,4'-diaminodiphenyl sulphone, nickel acetylacetonate and spherical particles of butadiene-nitrile-styrole-carboxylate copolymer, where the copolymer particle size is from 10-8 to 10-7 m, at the following ratios, parts by weight: epoxy-diane resin: 100, the said polymer 5-20, 4,4'-diaminodiphenyl sulphone 20, glass cloth 170, nickel acetylacetonate 1.
EFFECT: glass fibre resistance to multiple bends.
1 tbl, 3 ex