Abstract: Waste PE-LD/PVDC/PE-LD composite film was recycled with addition of Ca-Zn stabilizer and chlorinated polyethylene (CPE) as a compatibilizer. The thermal stability, mechanical properties, barrier properties, and fracture surface micro-morphology of the blends were studied. It showed that with the addition of 1.2 phr Ca-Zn, the initial and complete Congo red color deterioration temperature of the blends increased by 8 ℃and 11 ℃, and the initial and complete Congo red color deterioration time extended by 67 s and 354 s, respectively. With the addition of 4.5 % CPE, the compatibility between PE-LD and PVDC improved because PVDC was embedded into PE-LD. The elongation at break of the blend increased by 76.70 %, the notched impact strength increased by 30.01 %, the oil absorption rate decreased by 33.61 % , compared with the blends without CPE. The flexibility and barrier properties of the blends increased markedly.

Key words: low-density polyethylene, poly(vinylidene chloride), composite film, recycled material, calcium-zinc thermal stabilizer, chlorinated polyethylene