摘要
采用聚磷酸铵(APP)和季戊四醇(PER)组成的膨胀阻燃剂(IFR),对乙烯-醋酸乙烯酯共聚物(EVA)与聚酰胺6(PA6)组成的EVA/PA6聚合物合金进行了阻燃改性。采用氧指数和垂直燃烧法,研究了IFR对EVA/PA6聚合物合金阻燃性能的影响,并测试了其力学性能。采用扫描电子显微镜对阻燃聚合物残炭形貌进行了表征。研究结果表明:随着IFR质量分数的增加,EVA/PA6聚合物合金的氧指数不断增大。当IFR质量分数为28%、m(EVA)∶m(PA6)=4∶1时,EVA/PA6聚合物合金显示出较优的阻燃性,此时极限氧指数为34.3%,垂直燃烧达到UL 94 V-0级。EVA/PA6阻燃聚合物合金的拉伸强度和断裂伸长率随着IFR质量分数的增加而逐渐降低。
The flame retardant modification of EVA/PA6 polymer alloy composed of ethylene-vinyl acetate copolymer(EVA) and polyamide 6(PA6) was carried out by using intumescent flame retardant(IFR) composed of ammonium polyphosphate(APP) and pentaerythritol(PER).The effects of IFR mass fractin on the flame retardancy of EVA/PA6 polymer alloys were studied by means of limiting oxygen index and vertical burning test. The mechanical properties were tested. The morphology of carbon residue of flame retardant polymer was characterized by scanning electron microscopy(SEM).The results show that the limiting oxygen index of EVA/PA6 polymer alloy increases continuously with the increase of IFR content.The limiting oxygen index(LOI) is 34.3% and vertical combustion level of the flame retardant EVA/PA6 alloy reaches UL 94 V-0 when IFR mass fraction is 28% and m(EVA)∶m(PA6) = 4∶1.The tensile strength and the break elongation of the flame retardant EVA/PA6 alloy gradually decrease with the increase of flame retardant mass fraction.
引文
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