汽车内饰用聚丙烯微发泡专用料的研制

Research of the Special Microfoamed Polypropylene Compounds for Auto Interior Ornaments

利用化学改性非交联法和单螺杆挤出机,采用一步法挤出工艺研制了汽车内饰用聚丙烯(PP)微发泡料。以均聚PP和共聚PP为基础树脂,考察了影响PP发泡的主要因素(如引发剂、发泡剂的用量、挤出温度等)。结果表明,具有良好性能的PP微发泡专用料的配方(质量份数):均聚PP为40.00份,共聚PP为60.00份,过氧化二特丁烷为0.18份,过氧化二异丙苯为0.02份,改性剂为0.50份,碳酸钙为0.50份,发泡剂AC为0.40份。以其制备的微发泡片材泡孔直径小于50μm,泡孔密度可达106个/cm3。

The special microfoamed polypropylene compounds for auto interior ornaments were developed by one-step extrusion process with non-crosslinked technology and single screw extruder.Blended with homopolypropylene and block copolymer of propylene as basic resins,the main factors affecting the properties of microfoamed polypropylene were examined,including types and dosage of initiator,and foaming agent,extrusion temperature,etc.A recipe for preparing microfoamed polypropylene compounds for auto interior ornaments was selected as follows,homopolypropylene of 40.00 phr,block copolymer of propylene of 60.00 phr,ditert-butyl peroxide of 0.18 phr,dicumyl peroxyide of0.02 phr,modifying agent of 0.50 phr,CaCO_3 of 0.50 phr,azodicarbonamide of 0.40 phr.The microfoamed sheet prepared by modified polypropylene had cell diameter of less than50μm and cell density of up to 10~6/cm^3.