基于均三嗪环结构的聚己内酰胺6复合树脂制备及其抗熔滴阻燃特性  

Preparation method of and anti-dripping and flame retardant properties of polycaprolactam 6 composite resin based on homotriazine ring structure

作　　者：张文琪 李莉莉[1,2] 胡泽旭 魏丽菲[3] 相恒学 朱美芳[1,2] ZHANG Wenqi;LI Lili;HU Zexu;WEI Lifei;XIANG Hengxue;ZHU Meifang(State Key Laboratory for Modification of Chemical Fibers and Polymer Material,Donghua University,Shanghai 201620,China;College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai Defulun New Material Technology Co.,Ltd.,Shanghai 201502,China)

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海201620 [2]东华大学材料科学与工程学院,上海201620 [3]上海德福伦新材料科技有限公司,上海201502

出　　处：《纺织学报》2023年第11期1-8,共8页Journal of Textile Research

基　　金：国家自然科学基金项目(52003042,52073047);上海市优秀技术带头人计划项目(20XD1433700);上海市“一带一路”国际合作项目(20520740800);教育部“创新团队发展计划”滚动支持项目(IRT16R13)。

摘　　要：针对聚己内酰胺6(PA6)高温氧化诱导分子链断裂产生的持续燃烧和熔体滴落等问题,利用均三嗪环阻燃剂(CFA)的膨胀成炭性质,采用熔融共混方式得到阻燃抗熔滴PA6复合树脂,分析了CFA阻燃剂的成炭性能,研究了添加不同质量分数CFA阻燃剂的PA6复合树脂的阻燃性能与燃烧后残炭的结构及形貌。结果表明:当CFA质量分数为8%时,阻燃抗熔滴PA6复合树脂的垂直燃烧等级达到V-0级,点燃后仅燃烧1 s即熄灭,熔滴滴落1滴;阻燃抗熔滴PA6复合树脂极限氧指数从纯PA6的24.5%提升到33.4%,总烟释放量下降13.3%;受阻燃剂高温残炭量高的影响,随着CFA质量分数的增加,在空气氛围中,残炭量从纯PA6的1.87%提高到4.84%;CFA诱导PA6阻燃机制为气相中的不燃性气体的稀释效应以及凝聚相中炭层的阻隔效应;CFA阻燃剂的加入并未导致PA6拉伸断裂强度下降,反而使其有所提升,CFA质量分数为8%时,PA6复合树脂的拉伸断裂强度提升28.8%。Objective Polycaprolactam 6(PA6)is a polymer material widely used in daily life,but it is flammable.High-temperature oxidation during combustion process would cause its molecular chain to break,resulting in problems such as continuous combustion and melt dripping.At present,charring technology has become an important means to solve these problems.The homotriazine ring flame retardant has excellent charring performance by virtue of its conjugated stable structure,which has greatest potential to solve the problem of PA6 flame retardant.Method Triazine flame retardant forms a carbon layer on the polymer surface to resist the further combustion of flame,hence improving the flame retardancy of PA6.Triazine ring structure also has certain structural compatibility with PA6 molecular chain,which would not affect the processing and mechanical properties of PA6.Therefore,homotriazine ring flame retardant(CFA)was added to PA6 by melt blending to improve the flame retardancy of PA6.The charring performance of the PA6 composite resin was studied through the thermal experiment.By examining the limiting oxygen index,vertical combustion and cone calorimetry experiment,the influence on the flame retardant and charring property on PA6 resin was studied,which was used for explaining the mechanism of the CFA flame retardant.Results In this research,a series of composite resin were prepared by melt blending CFA flame retardant and PA6.After adding 8%CFA flame retardant to PA6 resin,the vertical combustion rating reached V-0 level,the limiting oxygen index increased from 24.5%to 33.4%(Tab.1 and Fig.2),and the total smoke release decreased by 13.3%(Fig.3),suggesting the effectiveness of CFA in many aspects.The charring rate of CFA flame retardant itself in the air atmosphere reached 8.3%,and the charring rate of PA6 composite resin after adding 10%CFA was more than twice that of pure PA6,from 1.87%to 4.84%(Fig.4),because of better isolation to oxygen and heat.By analyzing the four decomposition processes of CFA flame retardants in a ni

关 键 词：聚己内酰胺6 阻燃改性 抗熔滴 均三嗪环 成炭性能 熔融共混 

分 类 号：TQ342[化学工程—化纤工业]