微胶囊红磷阻燃剂在低密度聚乙烯材料中的应用研究

研究了微胶囊红磷不同包覆、用量、粒径及与其它阻燃剂的协效作用等因素对低密度聚乙烯(LDPE)材料的阻燃性、力学性能及抑烟性能的影响。蜜胺树脂囊材包覆与蜜胺树脂／硼酸锌双层囊材包覆微胶囊红磷在聚乙烯(PE)中的阻燃性最好；8phr的微胶囊红磷添加量即可使材料的阻燃性能达UL 94V-0级，极限氧指数(LOI)从17．4％上升到22．5％；在添加量范围内对材料的力学性能影响很小；二元体系中，微胶囊红磷／氢氧化铝，微胶囊红磷／氢氧化镁与微胶囊红磷／硼酸锌复配具有良好的阻燃协效作用，协效指数分别为1．6、1．4和2．3，微胶囊红磷／硼酸锌二元复合体系有良好的抑烟协效作用，三元体系中，微胶囊红磷／硼酸锌／十溴联苯醚、微胶囊红磷／氢氧化铝／氢氧化镁和微胶囊红磷／硼酸锌／三聚氰胺体系有很好的阻燃协效作用，协效指数分别为2．6、2．1与2．0。

Study on Application of Microencapsulated Red Phosphorus Flame Retardant in LDPE Compound

The effects of the encapsulant, content, particle size and synergistic action of microencapsulated red phosphorus (MRP)with other flame retardant on the flame retardancy, mechanical properties and smoke suppressing of flame-retarded LDPE cable compound were studied. The results showed that the flame retardancy of the compound containing MRP in the melamine resin and in the melamine resin/zinc borate was the best. When the content of the MRP was 8phr, the flame retardancy of the compound reached up to the level of UL94 V-0 and the LOI increased from 17.4% to 22.5%; and the effect on the mechanical properties of the compound was little when the content was within the extent of loading; among the binary systems, MRP/aluminium hydroxide, MRP/magnesium hydroxide and MRP/zinc borate had the excellent synergistic effects, the synergistic indexes were 1.6, 1.4 and 2.3 respectively, and MRP/zinc borate had good synergetic effects of smoke suppressing; among ternary systems, MRP/zinc borate/decabromodiphenyl, MRP/aluminium hydroxide/magnesium hydroxide and MRP/zinc borate/melamine had the excellent synergistic effects, the synergistic indexes were 2.6, 2.1 and 2.0 separately.