Abstract: A composite board was prepared with KH-550 modified sisal fiber as a reinforcer and polyvinyl chloride (PVC) as the matrix. Five light stabilizers were introduced into the composite separately, two commodity ones, UV-0 and UV-531, and three homemade benzophenone polymer light stabilizers, designated as P(HABP-co-MTMP-co-OA), P(HABP-co-MTMP-co-mPEGA), P(HABP-co-MTMP-co-OA-co-mPEGA). Accelerated UV aging was carried out on the samples, and tensile strength retention rate, contact angle, and loss rate of heat extraction before and after aging were determined. It was found that the polymer light stabilizers had better UV aging resistance than that of UV-0 and UV-531, with P(HABP-co-MTMP-co-OA-co-mPEGA) being the best. Observed by SEM, after UV aging of 50 days, less surface microcracks were observed in the systems with the polymer light stabilizers than those without.

Key words: poly(vinyl chloride), sisal fiber, wood plastic composite, UV-light aging