Study on the effect of oiliness agents on friction characteristics of paper-based friction materials under low sliding velocity

摘要

The purpose of this research is to elucidate the friction mechanism between paper-based friction materials and steel and to characterize the effect of the lubricant composition on the frictional properties at low sliding velocity. Effect of some oiliness agents having the different polar group and the same alkyl group on wet clutch frictional properties was determined with a modified SAE No.2 machine and a reciprocating tribometer. A close correlation was observed between the results with SAE No.2 machine and those with the reciprocating tribometer. The reciprocating tribometer is effective to obtain the fundamental data concerning the frictional properties of materials for wet clutch systems. When the effect of additive was compared at a constant concentration, oleylamine and oleic add showed a positive slope while oleyl alcohol, methyl oleate and base oil showed a negative slope in the coefficient of friction versus sliding velocity characteristics. It was found that oiliness agents are more effective in reducing the friction coefficient when their bonding strength to the phenol resin is greater. The surface analysis showed that oleylamine forms a strong ionic bond with phenol resin, but that oleylamine does not form an adsorption film on the steel surface.