PE-LD/PVDC/PE-LD复合薄膜回收料制备共混材料的研究

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

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67s和354s,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。

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.