Abstract: In this paper, recycled highdensity polyethylene (RPE) was compounded with sericite powder, resin acid and a dispersant via a twinscrew extruder resulting in a RPE/sericite composite. The tensile, flexural, impact, and microstructure properties of the composite were measured to identify the effect of sericite loading on these properties. It showed that the sericite flake modified with 6～8 phr resin acid were finely dispersed in RPE matrix with almost no effect on the melt point and crystal temperature of RPE composite. With increasing contents of sericite powder, the tensile strength reduced, Izod impact and flexural strengths increased first and then decreased. When the content of sericite was 15 phr, the comprehensive mechanical property was optimal.

Key words: sericite powder, recycle highdensity polyethylene, resin acid, surfacetreated, mechanical property