PE-LD/PVDC/PE-LD复合薄膜回收料制备共混材料的研究

以废旧低密度聚乙烯/聚偏氯乙烯/低密度聚乙烯（PE-LD/PVDC/PE-LD）复合薄膜为基体材料，液体钙-锌(Ca-Zn)为热稳定剂，氯化聚乙烯(CPE)为相容剂，制备了PE-LD/PVDC/CPE共混材料，并对其热稳定性能、力学性能、阻透性能和微观形态结构进行了测试与分析。结果表明，加入1.2份液体Ca-Zn稳定剂，刚果红试纸起始变色温度和完全变色温度分别提高了8 ℃和11 ℃，刚果红试纸起始变色时间和完全变色时间分别延长了67 s和354 s，共混材料的热稳定性能大幅度提高；含4.5 %CPE的共混材料中，PVDC嵌入PE-LD中，相容性好，与未添加CPE的材料相比，其断裂伸长率提高了76.70 %，缺口冲击强度提高了30.01 %，吸油率下降了33.61 %，柔韧性和阻透性能明显提高。

Study on Blends Prepared by Waste PE-LD/PVDC/PE-LD Composite Film

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 behavior,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 %,and the oil absorption rate decreased by 33.61 %,compared with the blends without CPE.The flexibility and barrier properties of the blends increased markedly.