回收聚丙烯纳米复合材料的性能  

Property of Recycled Polypropylene Nanocomposites

作　　者：游一兰 贺国文 孟洪量 马德崇 肖春光 张园园 YOU Yilan;HE Guowen;MENG Hongliang;MA Dechong;XIAO Chunguang;ZHANG Yuanyuan(College of Materials and Chemistry Engineering,Hunan City University,Yiyang 413000,China;Key Laboratory of Low Carbon and Environmental Functional Materials of College of Hunan Province,Yiyang 413000,China;Hunan Xinjiyuan New Material Technology Co.,Ltd.,Yueyang 414400,China)

机构地区：[1]湖南城市学院材料与化学工程学院,湖南益阳413000 [2]低碳与环境功能材料湖南省普通高校重点实验室,湖南益阳413000 [3]湖南省新基源新材料科技有限公司,湖南岳阳414400

出　　处：《塑料工业》2024年第3期138-143,共6页China Plastics Industry

基　　金：湖南省教育厅一般项目(22C0513)。

摘　　要：采用硅烷偶联剂和硬脂酸对纳米二氧化硅(nano-SiO2)进行了复合改性,再通过双螺杆挤出机熔融共混制备了回收聚丙烯(RPP)纳米复合材料。研究表明,改性nano-SiO2有良好的疏水亲油性能和良好的分散效果。随着改性nano-SiO2质量分数的增加,RPP纳米复合材料的熔体质量流动速率先增大后减小,当改性nano-SiO2的质量分数为1%时,复合材料的熔体质量流动速率达到最大值。当改性nano-SiO2的质量分数仅为0.5%时,RPP复合材料的缺口冲击强度达到最大值22.23 kJ/m^(2),比0.5%未改性nano-SiO2/RPP的缺口冲击强度提高了134.99%。随着改性nano-SiO2质量分数的不断增加,复合材料的拉伸强度呈先增大后下降的趋势,3%改性nano-SiO2/RPP的拉伸强度达到最大值20.6 MPa。当红磷(RP)的质量分数为20%,改性nanoSiO2的质量分数为2%和3%时,RPP复合材料的阻燃级别达到UL94 V-0级。通过研究改性nano-SiO2对RPP的结构和性能的影响,为回收聚烯烃材料的高质化再生利用提供了价值参考。Nano silica(nano-SiO2)was modified by silane coupling agent(KH550)and stearic acid.Then recycled polypropylene(RPP)nanocomposites were prepared by twin-screw extruder melt-blending process.The results show that the modified nano-SiO2 has good hydrophobic and lipophilic properties and a good dispersion effect in the matrix.With the increase of modified nanoSiO2 mass fractions,the melt mass flow rate(MFR)of RPP increases and then decreases.When the mass fraction of modified nanoSiO2 is 1%,the MFR reaches the maximum.When the mass fraction of modified nano-SiO2 is only 0.5%,the impact strength of RPP composite reaches the maximum value of 22.23 kJ/m^(2),which is 134.99%higher than that of unmodified nano-SiO2/RPP with the same mass fraction.With the increase of modified nano-SiO2 mass fractions,the tensile strength of the composites increases first and then decreases.When the mass fraction of modified nano-SiO2 reaches 3%,the tensile strength of RPP reaches the maximum value of 20.6 MPa.When the mass fraction of red phosphorus(RP)is 20%,and the mass fraction of modified nano-SiO2 is 2%or 3%,the flame retardant level of RPP composites reaches UL94 V-0 level.Through studying the effects of modified nano-SiO2 on the structures and properties of RPP,the valuable references for the high-quality recycling of recycled polyolefin materials are provided.

关 键 词：回收聚丙烯 纳米二氧化硅 红磷 力学性能 阻燃性能 复合材料 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]