原位聚合法制备N-P复配型阻燃PA66树脂及性能

Synthesis and Characterization of N-P Compound Type Flame-Retardant Nylon66 Resin by In-Situ Polymerization

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。

Taked 4-（ 2-（ （ （ 2-carboxyethyl ） （ phenyl ） phosphoryl ） oxy ） ethoxy ） -4-oxohexanoic acid （ CPPOA ） and melamine cyanurate （MCA） as flame retardant unit, a flame retardant PA66 resin was prepared by in-situ polymerization reaction. The relative viscosity test showed that the introduction of the flame retardant unit would cause a decline of the molecular weight of PA66 resin. Mechanical property test results indicated that the introduction of flame retardant leaded to a decline of tensile strength, impact strength,bending strength and bending modulus. The limiting oxygen index （LOI） test and vertical burning test revealed that the flame retardant PA66 had good flame retardance. When the content of CPPOA and MCA were both 4% ,the LOI value of the material was 28.7% and its flame-retardant grade reached UL-94 V-0. The XRD test indicated that the flame retardant modification didn＇ t change the crystalline structure of PA66. The DSC revealed that the melting temperature, crystallization temperature and crystallinity of the nylon resin all dropped after the flame retardant modification. The TGA result showed that the initial decomposition temperature of the flame retardant PA66 was lower than that of pure PA66,but the char yield increased.