| 摘要 |
The present invention relates to a one-part room temperature vulcanizable organopolysiloxane rubber composition which crosslinks in the presence of moisture to form a coating for the corrosion protection of metals. The one-part organopolysiloxane rubber composition comprises the product which is obtained by mixing the following:a) from about 20 to about 98 weight percent of one or more polydiorganosiloxane fluids of the formulain which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical, R' is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical, R'' is OH or a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical and n has an average value such that the viscosity is from about 1 to about 100,000 centipoise at 25° C., wherein at least one of the polyorganosiloxane fluid has R'' equal to OH and n has an average value such that the viscosity is in the range from 1,000 to 100,000 centipoise at 25° C., preferably from 3,000 to 40,000 centipoise at 25° C.;b) from 0 to about 40 weight percent of a cyclo-organosiloxane of the formulain which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms and n has an average value of 3 to 10c) from 0 to about 40 weight percent of an inorganic extending or non-reinforcing fillerd) from about 0.5 to about 10 weight percent of an amorphous SiO2 reinforcing filler having a surface area of between about 100 to 250 m2/g and a particle size range between about 0.01 and 0.03 microns;e) from about 1 to about 7 weight percent of an oximinosilane cross-linking agent of the formula;in which R and R' are independently selected from monovalent alkyl or alkylene radicals having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms;f) from about 0.2 to about 3 weight percent of an adhesion promoter of the formulain which R2 and R3 are independently selected from monovalent alkyl or alkylene radicals having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms, b is an integer between 0 and 3, and R1 is a saturated, unsaturated or aromatic hydrocarbon radical having 1 to 10 carbon atoms which may optionally contain a functional group; andg) from about 0.02 to about 3 weight percent of an organotin salt as a condensation catalyst.
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