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以4-(2-(((2-羧基乙烷基)(苯基)磷酰基)氧)乙氧基)-4-氧代己酸(CPPOA)和三聚氰胺氰尿酸盐(MCA)为阻燃单元,通过原位聚合法制备了N-P复配型阻燃尼龙66(PA66)树脂。相对黏度测试表明,阻燃单元的引入会造成PA66树脂分子量下降。力学性能测试结果显示,阻燃PA66的拉伸强度、冲击强度、弯曲强度以及弯曲模量均有所下降。极限氧指数及垂直燃烧测试结果显示,阻燃PA66具有良好的阻燃性能,当CPPOA和MCA的含量均为4%时,阻燃PA66树脂的极限氧指数及阻燃等级分别达到28.7%和UL-94 V-0级。XRD测试表明,阻燃改性未改变PA66的晶型结构。DSC测试表明,阻燃改性后,尼龙树脂的熔融温度、结晶温度和结晶度均呈下降趋势。TGA结果表明,阻燃PA66的初始分解温度较纯PA66下降,但成炭率提高。
With 4- (2- (((2-carboxyethyl) (phenyl) phosphoryl) oxy) ethoxy) -4-oxohexanoic acid (CPPOA) and melamine cyanurate (MCA) Burning unit, prepared by in situ polymerization of NP composite flame retardant nylon 66 (PA66) resin. Relative viscosity test showed that the introduction of flame retardant unit will cause the PA66 resin molecular weight decreased. Mechanical properties test results show that the flame retardant PA66 tensile strength, impact strength, bending strength and bending modulus decreased. Limit oxygen index and vertical combustion test results show that the fire-retardant PA66 has a good flame retardant properties, when the content of CPPOA and MCA are 4%, the flame-retardant PA66 resin limit oxygen index and flame-retardant grade reached 28.7% and UL -94 V-0 level. XRD test showed that flame retardant modification did not change the crystal structure of PA66. DSC tests showed that the melting temperature, crystallization temperature and crystallinity of nylon resin all showed a decreasing trend after flame retardant modification. TGA results show that the initial decomposition temperature of flame retardant PA66 is lower than that of pure PA66, but the carbonization rate increases.