【摘要】 研究了三氧化钼（MoO₃）、硼酸锌（ZB）和聚磷酸铵（APP）的用量和配比对硬质PVC抑烟阻燃性能的影响；抑烟阻燃组分对材料裂解产物的影响,并探讨了抑烟阻燃机理。结果表明,MoO₃、ZB和APP的用量分别为3%、1%和10%时,PVC材料的最大烟密度由100降低到72．5,烟密度等级由87．7降低到53．2,氧指数由43．0%提高到58．0%。热失重和高温裂解色质联用色谱分析结果表明,没有经过改性的PVC在失重第一阶段不但脱去大量的HCl气体,使大分子主链形成较长的顺式共轭结构,而且该共轭链在裂解温度下发生了较多的环化反应,生成大量的苯、萘、茚等芳香族化合物及其同系物。MoO₃-ZB-APP组分明显促进了PVC脱去HCI的反应,使共轭分子链主要形成不易发生环化反应的反式结构,显著减少了芳香化合物有害气体的生成,使材料的发烟量降低。更多还原

【Abstract】 The influences of molybdenum trioxide（MoO₃）,zinc borate（ZB）,and ammonium polyphos- phate（APP） on the smoke suppression and flame retardance of PVC were investigated.When the weight percentages of MoO₃,ZB,and APP in PVC were 3%,1%,and 10%,respectively,the smoke suppression and flame retardance were greatly improved.The mechanism of decomposition of PVC was studied.During the decomposition,PVC releases HC1 and forms a cis-conjugated structure, aromatic compounds such as benzene,toluene and naphthalene were generated at 350℃through cy- clization.The MoO₃-ZB-APP system obviously accelerated the release of hydrogen chloride leading to a trans-non-coniugated structure,thus inhibited the formation of aromatic compounds.更多还原