纳米蒙脱土和尼龙6对聚丙烯无卤体系协同阻燃作用

Synergistic Effect of Nano-Montmorillonite and Polyamide 6 on Flame Retardance of PP Halogen-free System

聚丙烯/聚磷酸铵是典型的无卤膨胀阻燃体系,只有添加大量的聚磷酸铵才能达到阻燃目的,但是往往会使聚丙烯力学性能明显下降。为了使PP达到阻燃效果的同时不明显降低其力学性能,本文通过极限氧指数(LOI)、力学性能、热重分析(TG)、扫描电镜(SEM)等分析表征手段,研究了纳米有机蒙脱土(OMMT)和尼龙6(PA6)对马来酸酐接枝聚丙烯(PP-g-MAH)增容的聚丙烯/聚磷酸铵(APP)无卤阻燃体系的燃烧性能和力学性能影响规律。研究结果表明:纳米有机蒙脱土和尼龙6对聚丙烯具有协同阻燃作用,对体系力学性能影响较小;当蒙脱土含量为4phr、尼龙6含量为8phr时,体系的极限氧指数达到25.1%;蒙脱土和尼龙6的加入可明显提高聚丙烯的热失重温度,增加残余物质量分数。

Polypropylene/anmaonium polyphosphate （PP/APP） is a typical intumescent halogen-free flame retardant blend, which could only be flame remnant when a large amount of APP was added to the blend, but the addition of APP would make the mechanical properties of PP downgraded obviously. In order to make PP flame retardant without the downgrade of the mechanical properties of PP, the effects of organic montmorillonite （OMMT） and polyamide 6 （PA6） on the combustibility and mechanical properties of PP/APP compatibilized by PP-g-MAH were studied by means of LDI, mechanical properties test, TG and SEM. The results showed OMMT and PA6 had synergistic effect on the flame retardance of PP, but had little effect on the mechanical properties of the blend; The LOI of PP flame-retardant system was 25.1% when the blend was filled with 4 phr of OMMT and 8 phr of PA6; The addition of OMMT and PA6 could obviously rise the heat loss temperature of the blend and increase the residue weight ratio of the char.