注塑工艺参数对微发泡PP/SiO_2纳米复合材料发泡行为及力学性能的影响  

Effect of Injection Molding Parameters on Foaming Behavior and Mechanical Properties of Microcellular PP/SiO_2 Nanocomposites

作　　者：龚维[1,2,3] 高家诚[1] 何力[3] 于杰[3] 郑环[2] 何颖[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]贵州师范大学材料与建筑学院,贵州贵阳550014 [3]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《中国塑料》2010年第2期66-72,共7页China Plastics

基　　金：贵州省自然基金项目[黔科合J字(2009)2020];国家973前期项目(2007CB616912)

摘　　要：用正交实验研究了喷嘴温度、注射压力、注射速度和冷却时间等工艺参数对化学发泡法制备的微发泡聚丙烯(PP)/SiO2纳米复合材料的泡孔平均直径和泡孔密度的影响,用Image-pro图像处理软件对复合材料的泡孔尺寸进行了统计,并对其力学性能进行了分析。结果表明,在PP中添加纳米SiO2后,喷嘴温度对微发泡PP/SiO2纳米复合材料的发泡行为影响最大,其次为注射速度;实验范围内较理想的工艺参数为:喷嘴温度175℃、注射压力67.5MPa、注射速度95%、冷却时间35s;在此工艺条件下获得了泡孔平均直径为15.71μm、泡孔密度为9.8×106个/cm3的微发泡PP/SiO2纳米复合材料,冲击强度达5.45kJ/m2。The effect of nozzle temperature, pressure, velocity, and cooling time on the cell size, cell density, and mechanical properties of chemically foamed PP/SiO2 nanocomposites were studied through orthogonal experiments. The Image-pro software was used to count the cell number and calculate the cell size. It was found that the nozzle temperature was the most important factor, injection velocity was the second. The optimal injection processing parameters were nozzle temperature 175 ℃, injection pressure 67.5 MPa, injection velocity 95%, and cooling time 35 s, by which an impact strength of 5.45 kJ/m^2 ,an average cell diameter of 15.71 μm, a cell density of 9.8×10^6 cell/cm^3 were obtained.

关 键 词：聚丙烯 二氧化硅 纳米复合材料 微发泡 注射成型 工艺参数 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]