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以某进口均聚聚丙烯(PP)(PP1)为原料,通过挤出流延工艺制备了PP1硬弹性膜并在130℃下对其进行热处理,研究了挤出温度、流延辊转速及温度、热处理温度和时间等工艺参数对PP1硬弹性膜弹性回复率的影响,得到了最佳工艺条件,即挤出温度为195℃、流延辊温度及转速分别为90℃,26 r/min,热处理温度和时间分别为145℃,30 min。将该工艺应用于分子量及其分布与PP1基本相似的国产PP(PP2),发现由此工艺制备的PP2硬弹性膜的弹性回复率可达94.6%,与PP1硬弹性膜相差不大。通过冷热单向拉伸将PP1和PP2硬弹性膜制备成微孔膜,发现两者具有相似且优异的微孔结构。在此基础上,通过扫描电子显微镜研究了冷热拉伸工艺参数对PP2微孔膜拉伸成孔性的影响。结果表明,当冷拉伸倍数为15%,热拉伸倍数为100%,冷热拉伸速率均为50 mm/min时,制备的PP2微孔膜形成了完整规则的多孔结构。
A kind of PP1 (PP1) was used as raw material, PP1 hard elastic film was prepared by extrusion casting process and heat treated at 130 ℃. The effects of extrusion temperature, casting roll rotation speed and temperature , Heat treatment temperature and time on the elastic recovery rate of PP1 hard elastic film, the optimum conditions were obtained, namely the extrusion temperature was 195 ℃, the casting roll temperature and speed were 90 ℃, 26 r / min, Heat treatment temperature and time were 145 ℃, 30 min. The process was applied to domestic PP (PP2) with molecular weight and its distribution similar to that of PP1. It was found that the elastic recovery rate of PP2 hard elastic film prepared by this method can reach 94.6%, which is similar to that of PP1 hard elastic film. The PP1 and PP2 hard elastic films were prepared into microporous films by hot and cold uniaxial stretching and found to have similar and excellent microporous structure. On this basis, the effect of hot and cold drawing process parameters on the tensile porosity of PP2 microporous film was studied by scanning electron microscopy. The results show that the prepared PP2 microporous membrane has a completely regular porous structure when the cold draw ratio is 15%, the hot drawing ratio is 100% and the hot and cold draw rates are both 50 mm / min.