无卤膨胀复合阻燃低密度聚乙烯/乙烯-醋酸乙烯酯共混物的研究

分别采用三聚氰胺氰尿酸盐(MCA)、微胶囊红磷(MCP)以及氢氧化镁Mg(OH)2]等与膨胀型阻燃剂PNP进行复配,研究了不同阻燃剂及其配比对低密度聚乙烯/乙烯-醋酸乙烯酯(PE-LD/EVA)共混物的阻燃和力学性能的影响。结果表明,在PE-LD/EVA为70/30的基体树脂中,当复合阻燃剂的含量为35%时,PNP/MCA的最佳配比为3/2,阻燃材料的极限氧指数为30.8%;PNP/MCA/MCP的最佳比例为24/16/4,阻燃材料极限氧指数为32.3%;PNP/MCA/MCP/Mg(OH)2的最佳比例为24/16/4/22,阻燃材料的极限氧指数为30.9%,垂直燃烧达到UL 94V-0级,拉伸强度为11.1MPa,断裂伸长率为80.6%。

Study on Non-halogen Intumescent Complex Flame Retardant for PE-LD/EVA Blends

Melamine cyanurate(MCA),microcapsule red phosphorus(MCP),and magnesium hydroxideMg(OH)2] were compounded with an intumescent flame retardant PNP to prepare a multi-component flame retardant.The performance of the flame retardants in low-density polyethylene/ethylene-vinyl acetate(PE-LD/EVA) blends was studied.When the matrix resins of PE-LD/EVA was 70/30,the content of complex flame retardants was 35 %,the weight ratio of PNP/MCA was 3/2,the limited oxygen index reached 30.8 %.When weight ratios of PNP/MCA/MCP=24/16/4 was used,the limited oxygen index was 32.3 %.A limited oxygen index of 30.9 % was observed at weight ratios of PNP/MCA/MCP/Mg(OH)2=24/16/4/22,the vertical combustion level reached UL 94 V-0,and the tensile strength was 11.1 MPa,the elongation at break was 80.6 %.