P-N膨胀阻燃剂化学阻燃尼龙66树脂

Chemical Flame Retardancy PA66 with P-N Intumescent Flame Retardant

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。

A flame retardancy PA66 resin was prepared by the polymerization reaction between hexamethylenediamine and bis（4-carboxyanilino） phenyl phosphine oxide （BCNPO） which synthesized in lab, under 280 ℃ , 1.7 MPa. The FTIR results revealed that BCNPO contained P-N groups. The decomposition temperature of BCNPO reached to 234 ℃ from TGA results, could meet the requirements of the aggregation. Meanwhile, The FTIR results revealed that BCNPO was grafted in the chain of PA66 successfully. Compared to pure PA66,the flame retardancy PA66 was provided with excellent thermal stability by TGA results. The LOI and UL-94 test results of flame retardancy PA66 reached to 28% and V-0 respectively when the content of BCNPO reached to 3%. Cone calorimetry and scanning electron microscopy analysis showed BCNPO worked as gas- condensed phase flame-retardant mechanism on the PA66 matrix. The mechanical test results showed that flame retardaney PA66 resin kept favorably mechanical properties with BCNPO.