MPP协同MF@ADP阻燃低密度聚乙烯性能研究*

为提高低密度聚乙烯（LDPE）阻燃性能和阻燃LDPE复合材料的力学性能与抑烟性能，采用原位聚合法制备三聚氰胺-甲醛（MF）树脂包覆二乙基次磷酸铝（ADP）的MF@ADP微胶囊，再引入三聚氰胺聚磷酸（MPP）与MF@ADP进行协效复配，熔融共混制备阻燃LDPE复合材料。通过氧指数、热重分析、力学测试和烟密度测试等研究复合材料的阻燃、力学和抑烟性能。研究结果表明:MF@ADP微胶囊能改善阻燃剂与复合材料之间的相容性，与MPP复配构成的磷-氮膨胀阻燃体系能有效提高LDPE的抑烟性能；当MF@ADP∶MPP的质量比为2∶1时，材料的LOI达到了30.6%，垂直燃烧测试达到UL-94 V0级，拉伸强度为11.8 MPa，且形成的P/N/O高聚物炭层稳定性更高，可减少LDPE燃烧释放的烟雾量。

Study on properties of MPP synergistic MF@ADP flame retardant low density polyethylene

To improve the flame retardant properties of low density polyethylene (LDPE) and the mechanical and smoke suppression properties of flame retardant LDPE composites,the MF@ADP microcapsules with diethyl aluminum hypophosphite (ADP) coated with melamine-formaldehyde (MF) resin were prepared by using the in-situ polymerization method,and the melamine polyphosphate (MPP) was compounded with MF@ADP to prepare the flame retardant LDPE composites by melt blending.The flame retardant,mechanical and smoke suppression properties of composites were studied by the oxygen index,thermogravimetric analysis,mechanical tests and smoke density tests.The results showed that MF@ADP microcapsules could effectively improve the compatibility between the flame retardant and the composites,and the phosphorus-nitrogen expansion flame retardant system combined with MPP could enhance the smoke suppression properties of LDPE.When the mass ratio of MF@ADP:MPP was 2∶1,the LOI value reached 30.6%,the vertical combustion test reached UL-94 V0 grade,and the tensile strength was 11.8 MPa.In addition,the formed P/N/O polymer carbon layer was more stable,which reduced the amount of smoke released by LDPE combustion.