【摘要】 针对磷系阻燃聚酯存在耐熔滴差的问题,采用自制膨胀型阻燃剂(IFR)与聚四氟乙烯(PTFE)以不同的质量比配制成复合抑熔滴剂,将其与含磷阻燃聚酯(FRPET)切片通过熔融共混的方法制备阻燃抑熔滴聚酯共混物。借助差示扫描量热仪、热重分析仪、极限氧指数仪、水平燃烧测试仪、微型量热仪、锥形量热仪对共混物的热性能及阻燃性能进行表征。结果表明:当复合抑熔滴剂质量分数为15%,IFR和PTFE的质量比为1∶2时,二者的协同作用最为明显,熔滴的抑制作用也最显著;此时FRPET的极限氧指数从25%提高到30%,1 min内的熔滴数从46滴减少到21滴;700℃时的残炭量相对增加了68.8%,总燃烧释放热和总烟释放量都明显降低。更多还原

【Abstract】 In view of the melt-dripping problem for phosphorus-containing flame retardant polyethylene terephthalate( FRPET) during combustion, combined anti-dripping additive was prepared via combination of intumescent flame retardants( IFR) and polytetrafluoroethylene( PTFE). Then combined anti-dripping additive were melt blended into phosphorous-containing flame retardant polyester( FRPET)to obtain modified polyester samples. The thermal properties and flame retardant properties were characterized by means of differential scanning calorimetry,thermogravimetry,limiting oxygen index,horizontal burning test,micro combustion calorimeter( MCC),cone calorimetry. The results show that FRPET with 15% of combined anti-dripping additive( mass ratio of IFR and PTFE is 1∶ 2) can achieve the optimal flame retardancy. Combined anti-dripping additive system has obvious synergistic effect between IFR and PTFE to improve the dripping resistance. The limiting oxygen index value increases to30% from 25% and the numbers of melt-drops fell to 21 from 46 in 1 min. The char residue at 700 ℃increases by 68. 8% compared with the control sample( FRPET). In addition,the total heat release and total smoke release decrease significantly according to the MCC and CONE tests.更多还原