聚丙烯热灌装瓶专用料的卫生性能研究

Study on Health Performance of Special Polypropylene Material for Hot-filling Bottles

对影响乙烯/丙烯无规共聚和丙烯/丁烯-1无规共聚两种聚丙烯热灌装瓶专用树脂卫生性能的各个因素进行了研究。结果表明:以丁烯为共聚单体的试样含有较低的二甲苯和正己烷可溶物,更适合在食品包装上应用;注拉吹成型使聚丙烯分子链拉伸取向,结晶度大幅提高,溶剂可萃取物减少,产品的卫生性能得到改善。

The various factors affecting health properties of two polypropylene（ PP） resins for hot- filling bottles,namely ethylene / propylene random copolymer and propylene / butene- 1 random copolymer were studied. The results showed that： the sample with butene as comonomer contains low xylene and n- hexane soluble matters,which is more suitable for using in food packaging; injection,stretching and blowing molding makes PP molecular chain has stretch orientation,which substantially increased the crystallinity and reduced the extractable matters in solvent,so as to improve health properties of the product.