胺处理聚甲醛的热稳定化研究

Thermal Stabilization of POM by Amine Treatment

针对聚甲醛由于合成中残留催化剂及不稳定端基导致其热稳定较差的问题,采用胺对聚甲醛进行处理,并考察了胺种类、胺处理工艺及水用量对聚甲醛热稳定性能影响;采用等温热质量损失率、等温热质量损失速率、甲醛释放量分析等方法对三乙醇胺对POM的热稳定作用进行了进一步研究。结果表明:以三乙醇胺为胺处理剂、采用熔融后处理法可有效提高聚甲醛热稳定性能,三乙醇胺最佳用量为0.2%。

In view of the poor thermal stability of polyoxymethylene （POM） induced by the residual catalyst and unstable end groups formed in the synthesis of POM, the POM was treated by amine, and the effects of the variety of amine compounds, treatment technology and water content on the thermal stability of POM were investigated; the effect of triethanolamine on the thermal stability of POM was further studied by means of isothermal mass loss, isothermal mass loss rate, and formaldehyde emission amount. The results showed the thermal stability of POM could be improved remarkably by applying triethanolamine as amine treating agent through melting processing, and the optimum content of triethanolamine was 0.2 %.