Nok Corporation

Kenichi Kunieda

Akira Yamaguchi

Hiroki Matsui

Toshihiro Higashira

Masayuki Tanida

Hirotaka Mizuta

Shinobu Munekata

Kazuki Takeno

Hideyuki Huruyama

Tatsuhiko Watanabe

Disclosed is a surface-treating agent for oil seal lip portion, comprising a lubricant filler and an adduct compound consisting of an adduct of toluene diisocyanate and trimethylolpropane, the surface-treating agent being applied to the surface of vulcanized rubber forming a lip portion of an oil seal comprising the lip portion and a metal ring. The application of the surface-treating agent of the present invention to the sliding surface of a seal lip portion of an oil seal effectively lengthens the service life of the oil seal, when used in a sliding part or a moving part, and leads to energy saving of equipment that uses the oil seal.

Surface-treating agent for oil seal lip portion

This invention provides an oil seal that can maintain an excellent friction reduction function over a long period of time, has excellent abrasion resistance, and further has excellent sealing properties. The oil seal comprises a seal lip () formed of a rubber-like elastic material comprising a lip edge part () and an air-side slope () and a sealing fluid-side slope () provided on both sides of the lip edge part (). The air-side slope () has a coating film () on its surface. In the lip edge part () in its portion in contact with a shaft (), a sealing fluid-side rubber part (') and an air-side coating film () are simultaneously brought into contact with the shaft (). The coating film () is preferably formed of a coating agent comprising a fluororesin, a polyethylene resin, an isocyanate-modified polybutadiene resin, and a solvent.

Oil seal and process for producing the same

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Kanagawa, Japan

Kenichi Kunieda