EVA-g-MAH和滑石粉对金属氢氧化物/LLDPE材料性能的影响  

EVA-g-MAH and Talc on Performance of Metal Hydroxide/LLDPE Composites

作　　者：何风[1] 邹修敏 周松[2] 徐淳[1] 屈超[1] 黄坤 甘巧 HE Feng;ZOU Xiu-min;ZHOU Song;XU Chun;QU Chao;HUANG Kun;GAN Qiao(Sichuan Vocational College of Chemical Technology,Luzhou 646300,China;College of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]四川化工职业技术学院,四川泸州646300 [2]西南石油大学新能源与材料学院,四川成都610500

出　　处：《塑料科技》2024年第6期35-40,共6页Plastics Science and Technology

基　　金：四川省科技厅项目(2023YFG0241);精细化工应用技术泸州市重点实验室项目(HYJH-2308-B)。

摘　　要：为提高金属氢氧化物/聚乙烯复合材料的韧性和阻燃性能,以滑石粉(Talc)为阻燃协效剂,马来酸酐接枝乙烯-醋酸乙烯酯共聚物(EVA-g-MAH)为增韧剂,通过双螺杆挤出机和注塑成型制备了氢氧化铝/氢氧化镁/线型低密度聚乙烯(ATH/MH/LLDPE)阻燃复合材料。通过拉伸、冲击、极限氧指数、垂直燃烧试验和扫描电镜研究了ATH/MH、EVA-g-MAH和Talc含量对阻燃LLDPE力学性能、阻燃性能和形貌的影响。结果表明:ATH/MH含量增加,ATH/MH/EVA-g-MAH/LLDPE的拉伸强度和阻燃性能增加,断裂伸长率和冲击强度明显降低。添加EVA-gMAH有利于树脂基体包覆和分散ATH/MH,可同时提高ATH/MH/LLDPE的韧性和阻燃性能。固定阻燃剂(ATH、MH、Talc)总含量为60%,3%~11%Talc部分替代ATH/MH使复合材料的极限氧指数提高1.4%~4.2%,Talc和ATH/MH具有协同阻燃效应,7%Talc部分替代ATH/MH使Talc/ATH/MH/EVA-g-MAH/LLDPE的断裂伸长率和冲击强度分别提高50.0%和13.4%。To improve the toughness and flame retardancy of metal hydroxide/polyethylene composites,talc(Talc)was used as a flame retardant synergist,maleic anhydride grafted ethylene-vinyl acetate copolymer(EVA-g-MAH)was used as a toughener,and the aluminum hydroxide/magnesium hydroxide/linear low density polyethylene(ATH/MH/LLDPE)flame-retardant composites were prepared by twin-screw extruder and injection molding.The effects of ATH/MH,EVA-g-MAH,and Talc content on the mechanical properties,flame retardancy,and morphology of flame-retardant LLDPE were studied by tensile test,impact test,limiting oxygen index test,vertical burning test,and scanning electron microscope.The results show that as the content of ATH/MH increases,the tensile strength and flame retardancy of ATH/MH/EVA-g-MAH/LLDPE increase,while the elongation at break and impact strength decrease significantly.The addition of EVA-g-MAH is beneficial to the resin matrix wrapping and dispersing of ATH/MH,which can improve the toughness and flame retardancy of ATH/MH/LLDPE simultaneously.When the total content of flame retardants(ATH,MH,Talc)is fixed at 60%,replacing 3%~11%of ATH/MH with Talc can increase the limiting oxygen index by 1.4%~4.2%,and Talc and ATH/MH have a synergistic flame-retardant effect.Replacing 7%of ATH/MH with Talc can increase the elongation at break and impact strength of Talc/ATH/MH/EVA-g-MAH/LLDPE by 50.0%and 13.4%,respectively.

关 键 词：线型低密度聚乙烯 金属氢氧化物 马来酸酐接枝乙烯-醋酸乙烯酯共聚物 滑石粉 协同阻燃 力学性能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]