SU759567A1 - Electroinsulating impregnating varnish - Google Patents

Description

The invention relates to the production of electrical insulating impregnating varnishes without solvent, used for impregnating the windings of electrical machines and apparatus. ' five

There are various solvent-free electrical insulating impregnating varnishes based on unsaturated polyetherimides of the brand "Drescapt" GT-1040 and PT-1060 containing active polyamide, styrene inhibitors, initiators and polymerization accelerators.

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However, the above-mentioned varnishes have insufficient compatibility.15 with the enamels from which the windings are made, which limits the service life of electrical machines and apparatus.

The closest in composition of the already known interlacing varnishes without a solvent of 20 is a lacquer, including polyetherimide, obtained by condensation of 2 mol of 1,4-aminobutanol,

2 mol of maleic anhydride and 1 mol

4,4-dioxy-3,5,3> 5-tetrabromodiphenyl 25 propane-bis-glycidating, styrene, hydro-quinone, cobalt naphthenate, benzoyl peroxide [2].

Known varnish provides good compatibility with enamel wires 30

2

only in the initial state and has protective properties up to a voltage of 6.9 kV. However, compatibility deteriorates rapidly during operation, leading to premature failure of electric machines. In addition, it has a high viscosity and is unsuitable as impregnating varnishes.

Compatibility is the ability of two or more electrical insulating materials to perform their functions in combination with each other, forming an insulation system, within the scope of requirements not for each material individually, but for the insulation system as a whole. . ...

The aim of the invention is to increase. compatibility of polyetherimide lacquers with enamel wires, of which windings are made.

This goal is achieved by the fact that the lacquer containing unsaturated polyetherimide, styrene and / or its alkyl derivatives, initiator, inhibitor, polymerization accelerator, additionally contains unsaturated

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B’keyo'efyr'acrylic or methacrylic acid of the general formula

H0-to-c-sk - sn ₂ , '0 where K is alkylene C ₂ - C ₄ or k = n or c; to "= I or CH ^, -sv. "- si _a - ch ₂ cr with the following ratios tov, wt.%: component- Unsaturated poly etherimide 50-60 Styrene and / or its alkyl 7 .derivatives 35-45 Unsaturated hydroxyether with acrylic or methacrylate lovoy acid 2-10 Free radical initiator 0.5-3.5 ' Inhibitor 0.05-0.5 Polymer accelerator-. nation 0.001-1.0

GT m 1. The polyetherimide obtained by polycondensation of 2 mol of ингиб-р> -hydroxyethylimide isomethyl tetrahydrophthalic acid, 2 mol of maleic anhydride or fumaric acid and 1 mol of epoxy resin ED-22'or ED-20, dissolved in a molded glyceride or dissolving fumaric acid and 1 mol of epoxy resin ED-22 'or ED-20 dissolved in a molten anhydride or fumaric acid and 1 mol of epoxy resin ED-22' or ED-20 dissolved in a molten anhydride or fumaric acid; , 2% -p-benzoquinone. In the resulting solution is injected monomethacrylate ether of ethylene glycol of the formula

IO-CH _and CH _st OC (CH _b ') _and CH.

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The ratio of polyetherimide, styrene and ether in the resulting lacquer is 58: 38: 2. Lactivate the addition of 1% initiator - tertbutylperbenzoate and 1% 10% solution of cobalt naphthenate as an accelerator.

The resulting varnish is impregnated with mockups -beams consisting of 25 twists (pairs of conductors) made of PET-155 enamel wire (enameled with polyetherimide varnish PE955) and cured for 0.5 hour at 130-140 ° C. ·.>

For the layouts thus obtained, the average breakdown voltage between the conductors and the variation coefficient of the breakdown voltage in the initial state and in the process of aging are determined at 175 ° C. The test results are shown in the table.

'PRI mme R 2. Prepare varnish; as indicated in Example 1, with a ratio of koi & pern-poly efi ^ yyJ? "STY $ 83G: unsaturated! ether = 50: 43: 5. 1% tert-butyl perbenzoate and 1% NK-3 accelerator are injected into the lacquer.

Impregnated layouts and cure them in example 1.

The test results are shown in the table. ^one

Example Prepare varnish, as indicated in example 1, with the following ratio of components, weight,%:

Unsaturated poly

etherimide 50 five Styrene, inhibited by 0.2% p-benzoquinone Mono-acrylic ester chlorine 36.5 methylethylene glycol formula ten ten No-ns-n-s-ns-ns ₂ with the izra about Tretbutylperbenzoate. Benzoyl peroxide paste one 15 la (50% in dibutyl phthalate) 1.5 NK-1 accelerator one The resulting varnish is impregnated with ma · chum and harden them in example 1.

EXAMPLE 4 Unsaturated polyetherimide, obtained by polycondensation — 2 mol of Ν- [L-hydroxyethyl amide methylenedomethylenetetrahydrophthalic acid, 2.0 mol of maleic anhydride — 25 Read. And 1.3 mol of epoxy dian resin ED-24 are dissolved in styrene.

B. The obtained solution is injected with ethylene glycol monomethacrylate, an inhibitor — chloranil, an initiator — tert-butyl · -θ perocoate, and an accelerator NK-3 (cobalt naphthenate in the form of a 10% styrene solution). The lacquer components are taken in the following amounts, wt.%:

Polyetherimide bo

Styrene 35

Ethylene Glycol Monomethacrylate

Tretbutylperoctate 0.5

Hloranyle. .....-. · Oh 5

The accelerator NK-3 1,5

40 The resulting lacquer has properties that are similar to those of example 2.

45 Example5. Polyetherimide obtained by polycondensation of 2 mol

Ν- p-hydroxyethylimide methyl hexa-, hydrophthalic acid, 2 mol of maleic anhydride and 1 mol of epoxy

₅₀ resins of ED-24 are dissolved in a mixture of vinyltoluene and cC-methylstyrene. Ethylene glycol monomethacrylic ether, inhibitor p-benzoquinone, initiator hydroperoxide of isopropylbenzene and accelerator pentoxide are introduced into the solution.

• 55 vanadium. The lacquer components are taken in the following amounts, wt.%:

Polyetherimide .50

Vinyltoluene 42

cC-Methylstyrene 3

60 Monomethacrylic ester ·

ethylene glycol 2

Hydroperoxide 3

Isopropylbenzene 0.05;

p-benzoquinone 0.05

Vanadium Pentoxide 0p01

five

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The resulting varnish has properties similar to those of example 1. .

¹ Results are shown in the table.

' ⁴ . . · ¹

As can be seen from the table, polyetherimide lacquers according to the invention, containing unsaturated hydroxy esters of acrylic or methacrylic acid, have a much better compatibility with enamel wires than lacquers that do not contain such additives.

Since the service life of electrical machines and apparatus is significant

5 degrees is determined by the compatibility of the insulation systems used in them ^ the introduction of the proposed varnishes into the national economy can give a great economic effect.

Varnish Average breakdown voltage at. aging process 175 ° C, kV : Coefficient of variation during aging at 175 ° С,% Duration of aging, · h Duration of aging, ’ Come on. 1000 2000 3000 Come on. 1000 2000 3000 In example 1 8.7 6.5 4.6 3.9 9.8 ^e 22.1 28.3 thirty In example 1, not containing unsaturated ether 6.8 4.5 3.1 2.0 17.1 27 24.7 43 In example 2 8.1 8.1 5.7 4.3 10.6 14.8 23.5 30.5 In example 3 7.7 6.5 5.5 4.0. 16.6 28 32.2 32.2 Oooeskap RT-1040 (firm "0g. Week. B. From ¹ Germany wire Teguesk 53 L 5.2 3.9 3.2 1.7 23.2 30.1 37.5 46,8 Oooeskap RT-1060 wire "Teguesc 533 '(company" 0 g. Weight K.L.So' FRG) 6.2 5.0 2.7 1.4 13.3 21.0 11.4 42.0 Known 'composition (prototype) 6, -9 4.1 2.9 1.6 11.8 27 35.8 47.2

Claims (1)

Claim Insulating impregnating 45 lacquer, including unsaturated polyetherimide, styrene and / or its alkyl derivatives, free radical initiator, inhibitor and polymerization accelerator, characterized by the fact that in order to increase the compatibility of varnish with enamel wires, of which windings are made, varnish. additionally contains unsaturated hydroxy ester of acrylic or methacrylic acid of general formula in the following ratio, wt.%: Unsaturated poly etherimide 50-60 Styrene and / or its lacyl derivatives Unsaturated hydroxy- 35-45 acrylic ester or methacrylic acid free radical 2-10 initiator 0.5-3.5 Inhibitor 0.05-0.5 • Polymer accelerator nation 0.001-1.0 but-h-o-s-sh = sn_ o where K is alkylene C, ^ or -cp'-C-H in * _ and whether · '·· (· 2 K = H OR C ^ / K = H OR C ^, sleep _and cross 60