PE/木粉/MRP/Nano–MH共混材料的阻燃及热分解动力学研究  

Flame Retardancy and Thermal Decomposition Kinetics of PE/Wood Flour/MRP/Nano-MH Blend Material

作　　者：赵伊漫 郭玉花[1] 马舒慧 杜学义 刘晓橦 杨应龙 王烨 杨雅婷 ZHAO Yi-man;GUO Yu-hua;MA Shu-hui;DU Xue-yi;LIU Xiao-tong;YANG Ying-long;WANG Ye;YANG Ya-ting(School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学机械工程学院,天津300134

出　　处：《包装工程》2023年第3期16-22,共7页Packaging Engineering

基　　金：天津市自然科学基金企业科技特派员项目(17JCTPJC53600);大学生创新创业训练计划项目(202210069010)。

摘　　要：目的研究微胶囊红磷(MRP)和纳米氢氧化镁(Nano–MH)协同阻燃木塑复合材料(WPC)的阻燃效果及阻燃机理。方法以MRP为主阻燃剂,Nano–MH为协效阻燃剂,低密度聚乙烯(LDPE)、线型低密度聚乙烯(LLDPE)和木粉为基础物质,采用二次造粒和注射成型法制备阻燃木塑材料(WPC/MRP/MH)。通过燃烧等级测定、极限氧指数(LOI)测定和热重谱图(TG)分析阻燃剂对复合材料阻燃性的影响,利用Flynne–Walle–Ozawa(FWO)方法研究WPC和WPC/MRP/MH的热分解行为,并采用Criado方法推断WPC/MRP/MH的反应机理。结果复合材料MRP质量分数为12.5%时阻燃等级达到UL94 V–0级,LOI值高达28.3%;WPC/MRP/MH的t_(onset)、t_(endset)和t_(p)均高于WPC,且在热分解后期FWO方法得到的表观活化能(E_(a))逐渐增加,材料热稳定性明显提高;WPC/MRP/MH的反应机理函数为g(α)=[-ln(1-α)]1/n、f(α)=n(1-α)[-ln(1-α)]1/n,热分解机理为成核后增长。结论MRP和Nano–MH复配有效提高了WPC的热稳定性,复合材料的阻燃性能得到显著提高。The work aims to study the flame retardant effect and flame retardant mechanism of microencapsulated red phosphorus(MRP)and nanometer magnesium hydroxide(Nano-MH)flame retardant wood-plastic composite(WPC).MRP was used as the main flame retardant.Nano-MH was used as a synergistic flame retardant.Low density polyethylene(LDPE),linear low density polyethylene(LLDPE)and wood flour were used as the basic materials to prepare flame-retardant wood-plastic materials(WPC/MRP/MH).The effects of flame retardants on the flame retardancy of composites were analyzed by determination of combustion grade,limiting oxygen index(LOI)and thermogravimetry(TG).The thermal decomposition behavior of WPC and WPC/MRP/MH was studied through the Flynne-Walle-Ozawa(FWO)method.The reaction mechanism of WPC/MRP/MH was deduced by the Criado method.It was showed when the MRP mass fraction of the composite was 12.5%,the flame retardant grade reached UL94 V-0,the LOI value was up to 28.3%;the T_(onset),T_(endset) and Tpof WPC/MRP/MH were higher than those of WPC,and the apparent activation energy(E_(a))obtained by FWO method gradually increased in the later stage of thermal decomposition,and the thermal stability of the material was significantly improved;The reaction mechanism function of WPC was g(α)=[-ln(1-α)]^(1/n),f(α)=n(1-α)[-ln(1-α)]^(1/n).The thermal decomposition mechanism was growth after nucleation.The compounding of MRP and Nano-MH effectively improves the thermal stability of WPC.The flame retardant properties of the composites are significantly improved.

关 键 词：微胶囊红磷 纳米氢氧化镁 木塑材料 阻燃 热分解动力学 

分 类 号：TB332[一般工业技术—材料科学与工程]