协效剂在ABS/APP/PETA体系中的阻燃协效性

为了提高苯乙烯一丁二烯一丙烯睛(ABS）/聚磷酸铵(APP)/聚对苯二甲酞乙二胺(PETA)膨胀阻燃体系的阻燃性能，将硼酸锌(ZB）、红磷(RP）添加到ABS/ APP/ PETA膨胀阻燃体系中。采用极限氧指数法、垂直燃烧法、热失重、扫描电镜探讨了不同含量协效剂ZB,RP对不同比例ABS/APP/PETA阻燃体系的协效阻燃效应。结果表明，加人协效剂使ABS/APP/PETA体系的阻燃性能得到显著提高;将2.5份(质量份，下同)ZB和4份RP加人到ABS/APP/PETA( 70/22. 5/7. 5)体系，体系的极限氧指数由未加协效剂的30%提高到41%，UL-94测试也达到V-0级;ZB提高了ABS/APP/PETA体系热稳定性和成炭率，RP能极大地促进成炭;加人ZB和RP ,阻燃体系燃烧表面能够形成更多膨胀、致密的炭层。

Flame Retardant Synergistic Effect of Synergists in ABS/APP/PETA System

In order to improve the flame retardant effect of acrylonitrile-butadiene-styrene copolymer(ABS)/ammonium polyphosphate(APP)/poly(p-ethylene terephthalamide）(PETA)System,some commonly used synergists，such as zinc borate(ZB)，red phosphorus(RP ) and ZB, wereseparately introduced into the ABS/APP/PETA system. The improvement in the flame retardancycaused by the synergists was investigated using the limiting oxygen index(LOI）test，UL-94（vertical flame)test，thermogravimetric analysis(TGA)，and scanning electron microscopy（SEM）.Without adding the synergists, the ABS/APP/PETA(70/22. 5/7. 5)system gave LOI=30 and V-0 in the UI, 94 test.After adding 2. 5 phr ZB and 4 phr RP, the LOI value increased to 41%and the UI, 94 grade remained V-0. Meanwhile, ZB was effective in enhancing the thermal stability and the char residue ratio of the ABS/APP/PETA system and RP was effective in improving the char residue ratio markedly. In addition, the ABS/APP/PETA/ZB/RP(70/22.7. 5/2. 5/4) system formed more uniform and compact intumescent charred layers.