膨胀型阻燃剂NP430对三元乙丙橡胶阻燃性能的影响

采用膨胀型阻燃剂NP430填充三元乙丙橡胶(EPDM),研究其阻燃性能.结果表明:膨胀型阻燃剂NP430对EPDM具有很好的阻燃效果,外加酸源乙烯-醋酸乙烯共聚物(EVA)和碳源高苯乙烯(HS)树脂具有更好的协同阻燃作用.当EPDM/EVA/HS并用比为80/8.6/11.4、膨胀阻燃剂NP430用量为90份时,极限氧指数可达47.6.填充石蜡油会明显降低EPDM的阻燃性能,但不影响燃烧膨胀过程.而填充少量甲基丙烯酸锌、酚醛树脂等有机填料对EPDM的阻燃性能影响很小；填充炭黑、白炭黑、碳酸钙、可膨胀石墨等无机填料会导致燃烧产生的气体逸出,严重不利于膨胀过程,导致膨胀型阻燃剂不能发挥阻燃作用.

Influence of Intumescent Flame Retardant NP430 on Flame Retardancy of EPDM

The EPDM was filled with intumescent flame retardant(IFR) NP430,and its flame retardancy was investigated.The results showed that,the flame retardancy of EPDM with NP430 was good,and addition of acid source such as ethylene vinyl acetate(EVA) and carbon source such as high styrene(HS) resin provided synergisitic effect on the flame retardancy of EPDM.When EPDM/EVA/HS blend ratio was 80/8.6/11.4,and the addition level of IFR NP430 was 90 phr,the limited oxygen index of EPDM could reach 47.6.The flame retardancy of EPDM was significantly reduced by addition of paraffin oil,but the intumescence during burning was not affected.Organic additives such as zinc dimethacrylate and phenolic resin only had a little effect on the flame retardancy of EPDM.Addition of inorganic additives such as carbon black,silica,calcium carbonate and expanded graphite led to rapid escape of gas formed by burning,which greatly reduced the effect of NP430 and flame retardancy of EPDM.