MWNTs/卤-锑阻燃体系对PA6性能的影响

Effects of MWNTs/Halogen-antimony Flame Retardant on PA6

采用熔融共混法制备了聚酰胺6/多壁碳纳米管/十溴二苯乙烷-三氧化二锑(PA6/MWNTs/DBDPE-Sb2O3)阻燃复合材料,通过极限氧指数测试(LOI)、垂直燃烧测试(UL 94)、热重分析(TG)、差示扫描量热分析(DSC)、力学性能测试等方法研究了不同质量比的MWNTs/卤-锑阻燃体系对PA6/MWNTs/DBDPE-Sb2O3复合材料阻燃性能、热稳定性、力学性能以及非等温结晶行为的影响。结果表明:MWNTs的加入起到异相成核剂的作用,提高了复合材料的结晶速率且改变复合材料的晶型,同时使复合材料的热稳定性能得到改善。其中,当MWNTs含量为1%、DBDPE-Sb2O3含量为15%时,PA6/MWNTs/DBDPE-Sb2O3复合材料的LOI可达30.72%,垂直燃烧等级达到FV-0级,同时复合材料具有较好的力学性能。

With polyamide 6 （PA6） as the matrix, decabrominated dipheny ethane-antimony trioxide （DBDPESb2O3） as the main flame retardant, multiwalled carbon nanotubes （MWNTs） as the flame retardant synergist, the flame retardant PA6 composites were prepared by means of melt blending. The effects of MWNTs/halogen-antimony flame retardant system with different mass ratio on flameretardant property, thermostability, mechanical properties and non-isothermal crystallization behavior of the PA61MWNTs/DBDPE-Sb2O2 composites were studied by limited oxygen index measurements （LOi）, vertical burning test （UL94）, thermo-gravimetric analysis （TG）, differential scanning calorimetry （DSC） and mechanical property test. The results demonstrate that MWNTs play a role of heterogeneous nucleating agent in PA6/MWNTs/DBDPE-Sb203 composites, and it can raise crystallization rate, thermostability and transform crystal form. When the samples contain 1% MWNTs synchronized with 15% DBDPE-Sb2O3, the flame retardant PA6 composites own the higher LOI value （30.72%）, FV-0 rating and better mechanical properties.