目的 提升流延聚丙烯( CPP) 包装膜整体性能,改善 CPP 膜使用的性能缺陷。 方法 利用低熔点聚烯烃弹性体( POE) 材料与三元共聚聚丙烯( PP) 共混作为热封层,通过纳米二氧化硅( SiO₂) 增大挺度,并添加适量的滑剂解决薄膜发黏的问题,采用三层共挤流延法制备气调保鲜用 CPP 薄膜。 结果 在热封层中添加 14 份 POE-A4085 S、4 份纳米 SiO₂ 和 1 . 5 份爽滑剂,控制熔体温度为 240 ~ 250益 ,冷却辊温度为 24 益 ,利用三层共挤制备出始封温度低于 102 益 ,落镖冲击质量为 289 g,拉伸模量仅下降 4 . 44% 的高性能气调保鲜用 CPP 薄膜。 结论 POE / 纳米 SiO₂ 体系与三元共聚 PP 相容性好,增韧效果明显,挺度不下降。

Objective To enhance the overall performance of casting polypropylene ( CPP) film, and improve the performance deficiencies of CPP film. Methods Blending polyolefin elastomer ( POE) and nano-SiO₂with polypropylene terpolymer as low-temperature heat-sealing layer, CPP film for modified atmosphere packaging( MAP) was prepared via three-layer co-extrusion casting technology. Results It showed that the properties of the films obtained met the requirements, their heat-sealing initial temperature was below 102 益 , their dart impact strength reached 289 g, and their tensile modulus was reduced by only 4. 44% , while the heat-sealing layer was composed of polypropylene terpolymer blended with 14 phr POE-A4085S, 4. 0 phr nano-SiO₂, and 1. 5 phr slip additives, the melting temperature was controlled between 240 ~ 250 益 and the chill roll temperature was 24 益 . Conclusion POE / nano-SiO₂system blended well with polypropylene terpolymer, and the resulting CPP film had good dart impact strength and tensile modulus.