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以自合成的双-(对氨基苯甲酸)-苯基氧化膦(BCNPO)、己二胺、PA66盐为原料,通过高温(280℃)、高压(1.7 MPa)聚合制备了阻燃PA66树脂。红外分析表明BCNPO盐含有N-P膨胀结构;热分析结果显示BCNPO盐分解温度达234℃,可满足聚合要求。同时红外分析表明BCNPO经聚合成功接枝到PA66主链,热分析表明阻燃PA66树脂较纯PA66有更优异的热稳定性;当BCNPO质量分数达到3%时,阻燃PA66极限氧指数及垂直燃烧法分别达到28%和V-0级别;锥形量热法及扫描电镜分析发现BCNPO以气相阻燃及凝聚相阻燃作用于PA66基体材料;力学测试结果显示BCNPO阻燃PA66依然保持了良好的力学性能。
The flame retardant PA66 resin was prepared by the polymerization of high temperature (280 ℃) and high pressure (1.7 MPa) with the synthesized bis (p-aminobenzoic acid) -phenylphosphine oxide (BCNPO), hexamethylenediamine and PA66 salt as raw materials. Infrared analysis shows that BCNPO salt contains N-P swollen structure; thermal analysis results show that BCNPO salt decomposition temperature of 234 ℃, to meet the polymerization requirements. Infrared analysis showed that BCNPO was successfully grafted onto the main chain of PA66. Thermal analysis showed that flame retardant PA66 resin had better thermal stability than pure PA66. When BCNPO mass fraction reached 3%, flame retardant PA66 limit oxygen index and vertical BCNPO was found to be flame-retardant in gas-phase and condensed-phase in PA66 matrix. The mechanical test results showed that BCNPO flame-retardant PA66 still maintained good The mechanical properties.