疏松型纳米氢氧化镁阻燃聚丙烯

以聚丙烯(PP)为基体,疏松型纳米氢氧化镁(LN-MH)为主阻燃剂,红磷和炭黑为协同阻燃剂,制备了阻燃材料。实验结果表明:包覆剂A8使PP／LN-MH复合材料(m(PP)／m(LN-MH)为100:40)]力学性能最佳;偶联剂KH550和接枝物又进一步提高了复合材料的力学性能,使PP／LN-MH复合材料和纯PP相当;LN-MH的加入提高了PP的熔融峰温度,降低了结晶度和热失重起始温度,接枝物的加入进一步提高了熔融峰温度,相对增加了结晶度;红磷和炭黑的加入表现出良好的协同作用,在低LN-MH填充量时,加入9 phr红磷或7 phr红磷和5 phr炭黑后阻燃级别达到UL 94 V-0级;通过偶联剂和接枝物进一步改性,能够使复合材料在达到阻燃要求的同时保持良好的力学性能。

Study on flame retardant PP containing loose nano-magnesium hydroxide

A kind of flame retardant material was prepared with polypropylene (PP) as base resin, loose nano-magnesium hydroxide (LN-MH) as primary flame retardant and red phosphorous and carbon black as synergist. The coating agent A8 endued the composite (in which the mass ratio of PP to LN-MH equaled 100:40) with the superior mechanical properties. Coupling agent KH550 and the graft further raised the mechanical properties of the composite material to a level equivalent to those of pure PP. The addition of LN-MH increased melting peak temperature, reduced crystallinity and lowered onset temperature of heating loss. The introduction of the graft benefited the further rise in the melting peak temperature and relatively increased the crystallinity. The red phosphorus and carbon black exhibited preeminent synergistic effect. The flame retardant composite with nano-LN-MH reached UL 94 V-0 class after adding red phosphorus of 9 phr or red phosphorus of 7 phr and carbon black of 5 phr. The composite material not only satisfied the requirement of flame retardance, but also maintained the superior mechanical properties after being subject to further modification with the coupling agent and graft.