Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-11-19
1994-07-05
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524178, 524437, 524464, 524493, C08L 8304, C08K 906, C08K 322
Patent
active
053268040
ABSTRACT:
The present invention provides for an organopolysiloxane rubber composition for coating high voltage electrical insulators comprising the product which is obtained by mixing 30 to 50 weight percent of a mixture of 40 to 44 weight percent of a polydimethyl siloxane fluid having a viscosity from 10 to 15 Pa.S at 25.degree. C; 2.0 to 3.0 weight percent of a SiO.sub.2 reinforcing filler with a specific gravity of 2.2 and a range of particle size of 0.5 to 10 microns; 1.0 to 3.0 weight percent of an organosilicone cross-linking agent; 0.5 to 2.0 weight percent of an adhesion promotoer; 0.1 to 0.2 weight percent of a dibutyltindilaurate condensation catalyst and 36 to 48 weight percent of alumina trihydrate, the alumina trihydrate having a median particle size of 13.mu.m, containing 65.1 percent Al.sub.2 O.sub.3, 34.5 percent combined H.sub.2 O, 0.3 percent Ha.sub.2 O, 0.02 percent CaO, 0.01 percent SiO.sub.2 and having a specific gravity of 2.42, the alumina trihydrate being present in a proportion of 90 to 110 parts by weight of alumina trihydrate per 100 parts by weight of the polyorganosiloxane base, with 50 to 70 weight percent of a hydrocarbon solvent as a dispersion medium. The organopolysiloxane rubber composition of the present invention provides a coating for high voltage electrical insulators with greater resistance to leakage of electrical current.
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Cherney Edward A.
Huda Seraj ul
Mistry Balwantrai
Merriam Andrew E. C.
Michl Paul R.
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