Abstract: The UV stabilizing effects of antioxidant 1010, 168 and light stabilizer 622 on linear low density polyethylene (PE-LLD) were studied. Mechanical testing and gel permeation chromatography were carried out to study tensile properties and molecular weight of PE-LLD before and after UV-light aging. When antioxidant and light stabilizer were absent, the reserved elongation at break of PE-LLD was less than 50 % after UV-light aging for 3 d. With adding 0.15 phr of antioxidant 1010, 168 and light stabilizer 622 separately, the time of UV-light aging needed to decrease the elongation at break below 50 % were extended to 7, 6 and 15 d, respectively. When antioxidant 1010, 168 and light stabilizer 622 were used together, an obvious synergistic effect on the UV-light resistance of PE-LLD was observed.

Key words: linear low density polyethylene, UV-light aging, antioxidant, light stabilizer, synergistic effect