挤出口模结构对微孔木塑复合材料片材性能的影响  

EFFECTS OF EXTRUSION DIE STRUCTURE ON PROPERTIES OF MICROCELLULAR WOOD-PLASTIC SHEET

作　　者：贺湘伟[1] 王美珍[1] 吴智华[1] 

机构地区：[1]四川大学高分子科学与工程学院,成都610065

出　　处：《工程塑料应用》2008年第10期37-41,共5页Engineering Plastics Application

摘　　要：研究了不同的挤出口模结构对聚丙烯和聚乙烯基微孔木塑复合材料片材拉伸性能、密度和孔隙率的影响。结果表明,改变口模结构获得较大熔体压力降或压力降梯度时,木塑复合材料的拉伸强度、断裂伸长率较高,密度较小,孔隙率较高;压力变化为正向梯度变化时,木塑复合材料的拉伸强度较高,密度较小,孔隙率较高。Microcellular wood-plastic sheets were prepared by blending polyethylene or polypropylene with wood flour. The effects of extrusion die structure on tensile property, density and porosity of microcellular wood plastic sheet were studied. The results showed that the material with high tensile strength and elongation at break, low density and high porosity was prepared Under the Conditions of large melt pressure drop or pressure grads by changing extrusion die structure. The material with high tensile strength, low density and high porosity was prepared by high positive Pressure grads.

关 键 词：挤出口模 微孔木塑复合材料片材 拉伸性能 密度 孔隙率 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]