三氧化二锑协效MH阻燃EVA复合材料的研究
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摘要
利用垂直燃烧(UL94)、极限氧指数(LOI)、热失重分析(TGA)、扫描电镜(SEM)等方法研究了三氧化二锑(Sb_2O_3)在乙烯-乙酸乙烯酯共聚物(EVA)/氢氧化镁(MH)体系中的协效阻燃作用与机理。结果表明,当阻燃剂MH/Sb_2O_3的总添加量为57%时,EVA/MH/Sb_2O_3复合材料通过UL94 V-0级,氧指数达到33. 5%。与EVA/MH复合材料相比,EVA/MH/Sb2O3复合材料的热稳定性较好,残炭量更高; EVA/MH/Sb_2O_3复合材料炭层表面孔洞少,封闭效果好,导致阻燃性能更好。
In this paper,flame retardant mechanism of antimony trioxide( Sb_2O_3) in the ethylenevinyl acetate copolymer( EVA)/magnesium hydroxide( MH) composites was investigated through the measurements of UL94 testing, limiting oxygen index( LOI), thermogravimetric analysis( TGA) and scanning electron microscopy( SEM). The results demonstrate when the content of the total flame retardant is57%,the UL94 of EVA/MH/Sb_2 O_3 system could achieve V-0 level and the LOI value could reach 33. 5%.The thermal stability of EVA/MH/Sb_2O_3 composites is better than that of EVA/MH composites and EVA/MH/Sb_2O_3 composites have a larger amount of residual carbon. Moreover,the char layer structure of EVA/MH/MCA composites possesses less pores on the surface and better sealing effect,which results into better flameretardant properties.
In this paper,flame retardant mechanism of antimony trioxide( Sb_2O_3) in the ethylenevinyl acetate copolymer( EVA)/magnesium hydroxide( MH) composites was investigated through the measurements of UL94 testing, limiting oxygen index( LOI), thermogravimetric analysis( TGA) and scanning electron microscopy( SEM). The results demonstrate when the content of the total flame retardant is57%,the UL94 of EVA/MH/Sb_2 O_3 system could achieve V-0 level and the LOI value could reach 33. 5%.The thermal stability of EVA/MH/Sb_2O_3 composites is better than that of EVA/MH composites and EVA/MH/Sb_2O_3 composites have a larger amount of residual carbon. Moreover,the char layer structure of EVA/MH/MCA composites possesses less pores on the surface and better sealing effect,which results into better flameretardant properties.
引文
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[10]陈亚龄,谢新,李志君,等. PNP/Sb2O3协同阻燃NR/CPVC热塑性弹性体的研究[J].弹性体,2017,27(3):6-10.
[11]程宝发. PC/POSS复合材料凝聚相成炭机理及流变行为研究[D].北京:北京理工大学,2016.
[2]葛力天.高性能膨胀型阻燃复合材料的研制[D].北京:北京化工大学,2008.
[3]陈树国,禹海洋,王如寅,等. EVA无卤阻燃材料的研究进展[J].中国塑料,2008(4):13-20.
[4]舒万良,刘毅强.锑系有机阻燃剂的研究开发[J].精细与专用化学品,1995(16):2-4.
[5]何琳琳.无机阻燃剂锑化合物的阻燃机理及其应用的研究[J].佳木斯大学学报(自然科学版),2001,19(2):193-195.
[6] FENG C,LIANG M,CHEN W,et al. Flame retardancy and thermal degradation of intumescent flame retardant EVA composite with efficient charring agent[J]. J Anal Appl Pyrolys,2015,113:266-273.
[7] LI X Y,LIAO D T,MA H B,et al. Thermal degradation kinetics of a intumescent flame retardant system for halogenfree flame retarded EVA[J]. Adv Mater Res,2012,550-553:2767-2772.
[8] LI X, OU Y X. Thermal degradation behavior of polypropylene and ethylene vinyl acetate copolymer treated with intumescent flame retardants containing caged bicyclic phosphates[J]. Adv Mater Res,2014,936:17-22.
[9]周生刚.三氧化二锑/聚氯乙烯复合材料的制备及其阻燃性能的研究[D].兰州:兰州理工大学,2015.
[10]陈亚龄,谢新,李志君,等. PNP/Sb2O3协同阻燃NR/CPVC热塑性弹性体的研究[J].弹性体,2017,27(3):6-10.
[11]程宝发. PC/POSS复合材料凝聚相成炭机理及流变行为研究[D].北京:北京理工大学,2016.