新型P/N阻燃体系对薄壁聚丙烯材料阻燃性和热稳定性的影响

Effect of New P/N Flame Retardant System on Flame Retardancy and Thermal Stability of Thin-walled Polypropylene Materials

为了解决薄壁聚丙烯(PP)材料难以实现阻燃修饰的难题,文章将二乙基次磷酸铝(ADP)、聚磷酸酯和NOR型阻燃剂(NOR116)复配后添加到PP材料中,制备出阻燃PP薄壁材料。研究了三种阻燃剂在不同比例下对PP材料阻燃性能、热稳定性能、光学性能的影响,探索其阻燃机理。结果表明:当ADP∶OL1001∶NOR116的质量比为5∶5∶1.5时,阻燃剂总添加量为11.5%时,薄壁PP(0.5 mm)材料可以达到VTM-0级,LOI达到28.5%,具有较好的热稳定性能和成炭性能。阻燃体系引入后PP材料的结晶度下降。阻燃剂总添加量为11.5%时,PP材料的表观活化能提高到105.5 k J/mol,表明阻燃体系引入后可以显著提高PP的热稳定性能,延缓材料降解。NOR116具有显著气相协效作用,ADP/OL1001/NOR116体系具有凝聚相快速成炭和气相自由基捕捉和稀释效应。

In order to solve the difficult problem of flame retardant modification of thin-walled polypropylene(PP),diethyl aluminum hypophosphite(ADP),polyphosphate,and NOR flame retardant(NOR116)were added into PP to prepare flame retardant thin-walled PP.The effects of three flame retardants in different proportions on the flame retardancy,thermal stability and optical properties of PP materials were studied,and the flame retardancy mechanism was explored.The results show that when the mass ratio of ADP∶OL1001∶NOR116 is 5∶5∶1.5 and the total amount of flame retardant is 11.5%,the thin-walled PP(0.5 mm)material can reach VTM-0 grade and LOI is 28.5%,which has good thermal stability and charring performance.The crystallinity of PP decreases after the introduction of flame retardant system.When the total amount of flame retardant is 11.5%,the apparent activation energy of PP increases to 105.5 kJ/mol,which indicates that the introduction of flame retardant system can significantly improve the thermal stability of PP and delay the degradation of materials.NOR116 has obvious synergistic effect in gas phase,and ADP/OL1001/NOR116 system has rapid carbon formation in condensed phase and free radical capture and dilution effect in gas phase.