纳米氢氧化镁及其复合体系阻燃改性HDPE研究

通过纳米氢氧化镁(MH)及MH/RDP-NP(二苯基磷酸酯,热塑性酚醛树脂)复合体系改性HDPE.研究了MH颗粒大小,MH和表面改性剂硅烷偶联剂(SC)用量,及MH/RDP-NP复合体系中配比方式的不同对体系阻燃性能和力学性能的影响.实验结果表明:纳米MH对HDPE的阻燃性能和力学性能影响均好于微米MH,HDPE/纳米MH的质量比为100/60时,其垂直燃烧等级可达FV-2级,但其力学性能下降了30%;经质量为MH的3.5%的SC改性后,其氧指数可提高9.8%,冲击和拉伸强度提高20%;配比为3:1的MH/RNP-NP占HDPE质量的40%时,体系可达阻燃要求,体系的垂直燃烧等级达FV.1级,而其力学性能较纯树脂下降不大,下降幅度在20%以内.

Study on the Flame-Retardancy of Nano Mg(OH)2 and Its Composite in HDPE

Modifies HDPE with nano-magnesium hydroxide(MH)and MH/ RDP-NP composites. Studies the effect of MH's dimension, the amount of MH and silane coupling agents(SC) and the ratio of MH/RDP-NP on the flame retardant property and mechanical property of HDPE. The results show that nano MH is better than micron MH in improving flame retardant property and mechanical property of HDPE. When the mass ratio of HDPE /nano MH is 100/60, the range of vertical burning behaviour can reach FV-2, and the mechanical property decreases about 30 %. By modifying with SC of 3.5 % MH mass, the oxygen index can increase 9.8 % and the impact and tensile strength increase 20 %. When 3:1 ratio of MH/RNP-NP accounting for 40 % HDPE mass, the composites reach the requirement of flame retardancy , the range of vertical burning behaviour is FV-1, its mechanical property decreases less comparing to pure resin, and the decrease range is within 20 %.