赛克丁二酸聚酯的合成及协效阻燃作用

Synthesis and synergistic flame retardancy of the succinic polyester of THEIC

以丁二酸酐和赛克(THEIC)为原料,通过熔融缩聚合成了赛克丁二酸聚酯。n(THEIC)∶n(丁二酸酐)=0.8∶1.0、聚合温度为(180±5)℃、聚合时间为4 h、m(浓硫酸)∶m(反应物)=5∶100的条件下,产品产率为95.1%,水溶性为0.18 g/100 mL水。通过垂直燃烧实验和极限氧指数测定评价了赛克丁二酸聚酯与聚磷酸铵对聚丙烯(PP)的协效阻燃作用,并与赛克、赛克马来酸聚酯和赛克对苯二甲酸聚酯进行了比较。结果表明,赛克聚酯对PP的协效阻燃作用均明显差于赛克,但用前者制得的阻燃PP的耐水性明显好于后者;丁二酸聚酯和马来酸聚酯的协效阻燃作用无明显差异,均明显好于对苯二甲酸聚酯,但用马来酸聚酯制得的阻燃PP呈棕黄色,而用其他2种制得的阻燃PP为白色。

The succinic polyester of THEIC was synthesized through melting polycondensation from THEIC and succinic anhydride.Its optimum synthetic conditions are as follows:n(THEIC)∶n(succinic anhydride)=0.8∶1.0,the polycondensation temperature is(180±5)℃,the polycondensation time is 4 h,and m(H_(2)SO_(4))∶m(reactants)=5∶100.Under the above conditions,the yield of product is 95.1%,the water solubility is 0.18 g/100 mL water.The synergistic flame retardancy of the polyester and ammonium polyphosphate in polypropylene(PP)was evaluated by vertical burning test and limit oxygen index measurement,and compared with THEIC,the maleic polyester and the terephthalic polyester of THEIC.The results show that the synergistic flame retardancy of the polyesters is obviously poorer than that of THEIC,but the water resistance of the flame retardant PP with the polyesters is markedly better than THEIC.The synergistic flame retardancy of the succinic polyester and maleic polyester is indifferent,and both are better than that of the terephthalic polyester,the color of the flame retardant PP with the maleic polyesters is pale brown,but that of the other both is white.