| abstract |
Use of a lubricating grease composition of a fluororesin and a base oil consisting of a mixture of 100 parts by weight of at least one of a perfluoropolyether oil (A) represented by the following general formula: RfO [CF (CF 3 ) CF 2 O] p (CF 2 CF 2 O) q Rf wherein Rf is a perfluoroalkyl group having 1-5 carbon atoms, p + q = 2-200, q / p = 0-2, q can stand for 0 and the CF (CF 3 ) CF 2 O groups and the CF 2 CF 2 O groups are statistically bound in the main chain, and a perfluoropolyether oil (B) represented by the following general formula: F (CF 2 CF 2 CF 2 O) s C 2 F 5 wherein s = 2-100, and 2-100 parts by weight of at least one of a perfluoropolyether oil (C) represented by the following general formula: RfO (CF 2 CF 2 O) m (CF 2 O) n Rf wherein R f has the same meaning as defined above, m + n = 3-200, m: n = 10-90: 90-10, and the CF 2 CF 2 O groups and the CF 2 O groups are randomly attached in the main chain , and a perfluoropolyether oil (D) represented by the following general formula: RfO [CF (CF 3 ) CF 2 O] a (CF 2 CF 2 O) b (CF 2 O) c Rf wherein R f has the same meaning as defined above, a + b + c = 3-200, a is an integer of 1 or greater, b is 0 or an integer of 1 or greater, c is an integer of 1 or greater and the CF (CF 3 ) CF 2 O groups, the CF 2 CF 2 O groups and the CF 2 O groups are randomly linked in the main chain, for suppressing corrosion by sulfide gases on a copper or silver surface. |