采用聚乙烯（PE）、弹性体及其他助剂增韧改性聚丙烯（PP），熔融共混挤出造粒制备塑料输液容器用PP组合盖（拉环式）外盖材料。通过正交试验优化了各组分之间的配比，考察了弹性体、PE对PP组合盖（拉环式）外盖材料力学性能及外盖拉环开启力的影响。结果表明，弹性体用量对复合材料的性能影响最显著，当弹性体用量从15份（质量份，下同）增加到30份时，材料的冲击强度先增大后减小，最高达35kJ／m2，拉伸强度减小，外盖拉环开启力减小，最小达64N；扫描电子显微镜观察显示，当弹性体的用量小于25份时，弹性体在体系中分散均%Polypropylene （PP） composite for outer-cap ring of plastic infusion containers was prepared via melt extrusion blending of polyethylene （PE）, elastomer, PP, and other additives. The ratio of PP, PE, and elastomer was optimized by orthogonal factorial design. The mechanical properties of the composite and the open force of outer-cap ring were studied. It showed that the most important factor affecting the mechanical properties and the open force of outer-cap ring was the content of elastomer. The impact strength of the composite increased first and then decreased, the tensile strength and open force of outer-cap ring decreased with increasing contents of elastomer. SEM observations revealed that elastomer was finely distributed in the composite when the content of elastomer was less than 25 mass %. It could be concluded that the optimized recipe was： PP 65 mass %, PE 20 mass %, elastomer 25 mass %, and antioxidant and other additives 5 %.
展开▼
