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US 4,102,851 AGranted
Alumina-thickened cycloaliphatic epoxy materials for use in atmospheres of arced sulfur hexafluoride and articles thereof
AssigneeWestinghouse Electric Corp.
InventorsRussell M. Luck, Gordon C. Gainer
Life of this patent
Estimating the term…
Abstract
Reliability of power circuit breakers and other equipment containing parts subjected to an environment of arced sulfur hexafluoride is improved by using a cycloaliphatic epoxy resin filled with aluminum trihydrate and thickened with finely divided, highly dispersed aluminum oxide (alumina).
Claims18
Thixotropic compositions of matter consisting essentially of:
- (a) 100 parts by weight of a monomeric cycloaliphatic epoxy containing at least one cycloaliphatic ring,
- (b) about 30 to about 150 parts by weight of a flexibilizing agent selected from the group consisting of a polyazelaic polyanhydride, hexahydrophthalic anhydride and mixtures thereof,
- (c) about 120 to about 250 parts by weight of a material selected from the group consisting of aluminum trihydrate, naturally occurring magnesite and mixtures thereof acting as the filler, and
- (d) about 10 parts to about 75 parts by weight of Al.sub.2 O.sub.3 having an average particle size of between about 0.0005 micron to about 0.10 micron, acting as the thixotroping agent, said thixotropic composition having chemical resistance to arced SF.sub.6 upon cure.
1 more element
An insulated article in an environment of SF.sub.6 gas subject to arcing said article having a flexible insulating surface adapted to be exposed to said gas, said insulating surface consisting essentially of the cured reaction product of:
- (a) 100 parts by weight of a monomeric cycloaliphatic epoxy containing at least one cycloaliphatic ring,
- (b) about 30 to about 150 parts by weight of a flexibilizing agent selected from the group consisting of polyazelaic polyanhydride, hexahydrophthalic anhydride and mixtures thereof,
- (c) about 120 to about 250 parts by weight of a material selected from the group consisting of aluminum trihydrate, naturally occurring magnesite and mixtures thereof acting as the filler, promoting arc and track resistance in moist SF.sub.6 gas, and
- (d) about 10 parts to about 75 parts by weight of Al.sub.2 O.sub.3 having an average particle size of between about 0.0005 micron to about 0.10 micron, acting as the thixotroping agent, said insulating surface having chemical resistance to arced SF.sub.6 and resistance to track degradation in an environment of SF.sub.6.
1 more element
Dependencies are inferred from the claim text.