50··硅改性木质素成炭剂协同膨胀阻燃聚丙烯制备及性能研究*戴静陈伟佳潘梦丽欧红香(常州大学环境与安全工程学院,江苏常州213164)摘要为提高聚丙烯(PP)的阻燃性能,采用溶胶凝胶法制备膨胀阻燃剂炭源——硅改性木质素(SiO2@AL),与聚磷酸铵(APP)、双季戊四醇(DPER)经熔融共混制备膨胀阻燃PP复合材料。通过氧指数、垂直燃烧、热重分析、烟密度测试等考查复合材料的阻燃、热稳定性、抑烟等性能。结果表明:当添加4%SiO2@AL的PP复合材料UL-94测定达到V-0;而SiO2@AL与DPER的质量比为1∶3时,氧指数最高为27.6%。SiO2@AL/IFR/PP具有良好的高温稳定性能,较传统膨胀阻燃PP的热失重速率降低了1.75%,800℃时残留量增加了0.5倍;烟密度测试和残炭SEM分析表明,SiO2@AL的添加使PP形成了更加稳定的蜂窝状炭层,烟气释放总量呈下降趋势。关键词硅改性木质素聚丙烯溶胶凝胶法热分析阻燃Studyonpreparationandpropertiesofsiliconmodifiedlignincharringagentsynergisticintumescentflamere-tardantpolypropyleneDAIJingCHENWeijiaPANMengliOUHongxiang(CollegeofEnvironmentalandSafetyEngineering,ChangzhouUniversity,ChangzhouJiangsu213164,China)AbstractToimprovetheflameretardancyofpolypropylene(PP),thesiliconmodifiedlignin(SiO2@AL)wasprepar-edbysol-gelmethodasexpansionflameretardantcarbonsource.AndtheexpansionflameretardantPPcompositewaspreparedbymeltblendingwithSiO2@AL,ammoniumpolyphospphosphate(APP)anddipentaerythritol(DPER).Theflameretardancy,thermalstabilityandsmokesuppressionofthecompositeswereinvestigatedbyoxygenindex,verticalcombustion,thermogravimetricanalysisandsmokedensitytest.Theresultsindicatethat:with4wt%SiO2@AL,theUL-94ofthePPcompositematerialreachV-0level.WhenthemassratioofSiO2@ALtoDPERis1∶3,theoxygenindexis27.6%.SiO2@AL/IFR/PPhasgoodhightemperaturestabilityperformance,with1.75%lowerthermalweightlossrateand0.5timeshigherresidualamountat800℃thantraditionalintumescentflameretardantPP;smokedensitytestandresidualcarbonSEManalysisshowthattheadditionofSiO2@ALmakesPPformamorestablehoneycombcar-bonlayer,andthetotalamountofsmokereleaseshowsadecreasingtrend.Keywordssilicon-modifiedligninpolypropylenesol-gelmethodt...