芳基二磷酸酯的合成、表征及对ABS的阻燃研究

Synthesis and characterization of aromatic diphosphates and investigation of flame retardancy in ABS

为了获得无卤阻燃ABS产品,选用了磷酸酯类阻燃剂和成炭剂复配的方式对ABS进行了阻燃研究.合成了两种阻燃剂:四-(2,6-二甲苯基)间苯二酚二磷酸酯(DMP-RDP)、四-(2,6-二甲苯基)对苯二酚二磷酸酯(DMP-HDP),采用FTIR、1H-NMR、TGA等对产物进行了表征.将两种含磷阻燃剂分别和酚醛树脂复配对ABS进行阻燃处理,并研究其热降解行为.氧指数(LOI)测试显示,两种含磷阻燃剂和酚醛树脂复配比例为4∶1时,LOI最大,且DMP-HDP的氧指数稍高.结合TGA分析,阻燃剂复配可以促进成炭,磷残留于炭层中,有利于阻燃,炭残余量越大,炭层越稳定,阻燃效果越好.

To achieve effective flame retardant for acrylonitrile-butadiene-styrene （ ABS ） without halogen, synergistic effect was evaluated by incorporating phosphate with char body as coflame retardants. Two aromatic diphosphates （PFR） , which are tetra-（2,6 - dimethy phenyl） resorcinol diphosphate （ DMP - RDP） and tetra-（2,6- dimethy phenyl） hydroquinone diphosphate （DMP- HDP）, were synthesized and characterized by FTIR,^1H- NMR and TGA. A series of ABS/PFR/NP compounds were manufactured and experiment data were obtained by limit oxygen index（LOI） instrument and TGA under pure nitrogen. The results showed that the coflame retardants promoted crosslinking and char formation compared with control sample, especially, when ABS, PFR and NP was in the proportion of 75 ： 20： 5 and the LOI increased awfully. The TGA datum demonstrated that the more stable was the char generated in high temperature, the better flame retardancy was obtained.