Coating agent for oil seal
A coating agent for oil seal comprising 10 to 90 parts by weight in total of fluororesin particles having a particle size of 2 μm or less and filler particles other than fluororesin particles having a particle size of 0.5 to 30 μm, and 10 to 40 parts by weight of a wax having a melting point of 40 to 160° C., based on 100 parts by weight of isocyanate group-containing 1,2-polybutadiene, and being prepared as an organic solvent solution, wherein the fluororesin particles are used at a ratio of 20 to 80 wt. % of the total filler amount. The coating agent for oil seal can improve abrasion resistance while maintaining the roughness of a coating surface to which the coating agent is applied.
1. A coating agent for oil seal comprising
polytetrafluoroethylene particles,
polymethylsilsesquioxane or silicon dioxide particles,
a paraffin wax, and
isocyanate group-containing 1,2-polybutadiene, and
being prepared as an organic solvent solution, characterized by comprising
60 to 80 parts by weight in total of polytetrafluoroethylene particles having a particle size of 0.5 μm or less and polymethylsilsesquioxane or silicon dioxide particles having a particle size of 3 to 7 μm, and
10 to 30 parts by weight of the paraffin wax, based on 100 parts by weight of the isocyanate group-containing 1,2-polybutadiene,
wherein the polytetrafluoroethylene particles are used at a ratio of 30 to 70 wt. % of the total amount of the polytetrafluoroethylene particles, polymethylsilsesquioxane, and silicon dioxide particles.
2. An oil seal, which is subjected to coating treatment using the coating agent according to claim 1 .
3. The oil seal according to claim 2 , wherein after coating treatment, heat treatment is performed at 150 to 250° C. for 10 minutes to 24 hours.
4. The oil seal according to claim 2 , wherein a contact angle between an oil seal surface and engine oil is less than 35°.
5. The oil seal according to claim 3 , wherein a contact angle between an oil seal surface and engine oil is less than 35°.