联枯/次磷酸铝/MHB对聚丙烯的阻燃作用

Flame Retardancy of Bicummyl/Aluminium Hypophosphite/ Melamine Hydrobromide in Polypropylene

通过极限氧指数(LOI)测定、垂直燃烧试验和锥形量热分析研究了联枯/次磷酸铝/三聚氰胺氢溴酸盐复合物(DMDPB/ALHP/MHB)对聚丙烯(PP)的阻燃作用。结果表明,DMDPB/ALHP/MHB对PP具有良好的阻燃协效作用,当DMDPB,ALHP和MHB的质量分数分别为0.250%,1.000%和1.500%时,阻燃均聚PP(PPH)的LOI可达到25.8%,垂直燃烧级别达到V-2;当它们的质量分数分别为0.250%,2.500%和2.500%时,阻燃共聚PP(PPB)的LOI可达到23.4%,垂直燃烧级别达到V-2。添加ALHP/MHB明显降低了PP的最高热释放速率、热释放总量,复合DMDPB使以上参数进一步降低。

The flame retardancy of bicummyl/aluminium hypophosphite/melamine hydrobromide in polypropylene(PP)was studied through limiting oxygen index(LOI)measurement,vertical burning test and cone calorimetric analysis.The results showed that DMDPB/ALHP/MHB had a good synergistic effect on flame retardancy in PP.When the addition of DMDPB,ALHP and MHB were 0.250%,1.00%and 1.50%respectively,the LOI of flame retardant homopolymer PP(PPH)could reach 25.8%and the vertical combustion level reached V-2.Meanwhile,when their addition amounts were 0.250%,2.50%and 2.50%respectively,the LOI of flame retardant copolymerized PP(PPB)could reach 23.4%and the vertical combustion level reached V-2.It was clear that the maximum heat release rate and total heat release were significantly decreased by adding ALHP and MHB,and the parameters above were further decreased by compounding DMDPB.