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Semiconductor band with improved chemical resistance. RU patent 2510649.

IPC classes for russian patent Semiconductor band with improved chemical resistance. RU patent 2510649. (RU 2510649):

H01B1/24 - CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING, OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F0001000000; waveguides H01P; installation of cables or lines, or of combined optical and electric, cables or lines H02G)

C08L63/00 - Compositions of epoxy resins; Compositions of derivatives of epoxy resins

C08L23/34 - by chlorosulfonation

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FIELD: electricity.

SUBSTANCE: invention relates to production of semiconductive materials used for corona shielding of high-voltage windings of electrical machines. The invention suggests semiconductive band containing fibrous substrate with semiconductive compound applied on it including (wt %): chlorosulphonated polyethylene (6.5-12.0), epoxy resin (0.5-3.0), curing agent (0.01-0.2), current-carrying filler (6.0-40.0) and organic solvent (remains).

EFFECT: semiconductive band has chemical resistance to epoxy-anhydride compound and does not practically change its electrical performance after band saturation as per vacuum forcing method accepted in the industry.

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The invention relates to the electrical engineering, in particular to the production of semi-conducting materials used for protivokariosnoe protection of high-voltage windings of electrical machines.

Very often the high-voltage winding coated with semiconducting coating are vakuumanlagen impregnation epoxyurethane compound. The characteristics of semi-conducting coating can vary a lot and it (semi-conducting coating) ceases to carry out its purpose.

Famous semi-conducting tape BOB-400 (TU 1915-043-50157126-2006) production ELINAR holding company, which changes the resistance after impregnation epoxyurethane compound three orders of magnitude increase.

Famous semi-conducting tape PPL-R-1 (2, 3,)B (TU 3491-038-31885305-2006) production of CJSC "Dielectric"that change the resistance after impregnation epoxyurethane compound of three to five orders of magnitude increase.

Known conductive polyester tape 215.51, 215.55, 215.63 production Von Roll Isola that change the resistance after impregnation epoxyurethane compound for three to four orders of magnitude increase.

The closest solution of similar tasks is a semi-conducting tape for protivokariosnoe protection of high-voltage windings of electrical machines, containing fiber substrate, impregnated binder based on butadiene-nitrile rubber, catalysts knitting and conductive fillers (Patent RU №2150760 from 10.11.98, CL H01B 1/24; H02K 3/40; H01B 1/00).

The present invention is development of semi-conductive tape with a rated electrical resistance, minimally changing after vakuumanlagen impregnation epoxyurethane compound.

To solve this problem it is offered semi-conducting tape containing a substrate of glass or polyester or aramid, or polyetheramines paper thickness 30-200 mm with a deposited semiconductor composition, comprising a binder - chlorosulphurized polyethylene (molecular weight 20-40 thousand), epoxy resin (Dianov, Apoksiomen, nitrogen-containing, cycloaliphatic epoxy number 15-30), amine catalyst type, organic solvent, conductive fillers (carbon black, graphite, silicon carbide) in the following ratio of components, semi-conducting composition,% Mas.:

Chlorosulphurized polyethylene

6,5-12,0

Epoxy resin

0,5-3,0

The catalyst

0,01 -0,2

Conductive filler

6,0-40,0

Organic solvent

Else

When the content of components in semi-conducting tape,% Mas.:

Semi-conducting composition

15-35

Substrate

65-85

To obtain semi-conducting tape, according to the invention first prepare semi-conducting composition, based on the above ratio of ingredients. As conductive filler serve as carbon black, graphite, silicon carbide or their mixtures. Dissolution of chlorosulfonated polyethylene, epoxy resin, catalyst spend in the amalgamator at room temperature. Solid components fray in the obtained solution of the bead or ball mill to the dispersity of 5-15 micron.

Song put on tape by passing it through the bath impregnating machines with subsequent drying at the temperature 80-180'c for 2-10 minutes.

The invention is illustrated by the examples given in the table:

Table No. p/p

Material name, the standard indicators

Option 1

Option 2

Option 3

Chlorosulphurized polyethylene

9,7 7,8 8,0 2.

Epoxy resin ED-20

1,9 0,8 0,9 3.

Catalyst

0,01 0,02 0,02 4.

Technical carbon

7,6 1,8 0,9 5.

Silicon carbide

- 33,9 34,5 6. Solvent else else else 7.

Specific surface electrical resistance, Ohm

1,5·10 3

6·10 7 2·10 8 8.

Specific surface electrical resistance after impregnation epoxyurethane compound, Om

4·10 3 9·10 7 5·10 8

According to the invention of semi-conductive tape has a chemical firmness to boxinginsider the compound and practically does not alter the electrical characteristics after impregnation them tapes on vakuumanlagen method adopted in industry.

Semi-conductive tape for protivokariosnoe protection of high-voltage windings of electrical machines, containing fibrous substrate coated with semi-conducting composition, including conductive fillers and polymer binder, notable as a polymer binder is used chlorosulphurized polyethylene mixed with epoxy resin and catalyst in the following ratio of ingredients in semi-conducting composition,% Mas.:

Chlorosulphurized polyethylene

- 6,5-12,0

Epoxy resin

- 0,5-3,0

The catalyst

- 0,01 -0,2

Conductive filler

- 6,0-40,0

Organic solvent

- the rest

When the content of components in semi-conducting tape,% Mas.:

Semi-conducting composition

- 15-35

Substrate

- 65-85