甲酰胺插层改性高岭土对乙烯-醋酸乙烯共聚物(EVA)阻燃性能的改善

Preparation of formamide-intercalated kaolinite and its use to improve the flame-retardancy of EVA composites

将甲酰胺(FA)通过插层改性引入高岭土(Kaol)分子层间,制备得到FA-Kaol改性高岭土材料,产物的插层率达到92.1%;通过红外光谱(FT-IR)、X射线衍射(XRD)和热重分析(TGA)对FA-Kaol结构进行表征。然后通过熔融共混将FA-Kaol添加到乙烯-醋酸乙烯共聚物(EVA)/膨胀阻燃剂(IFR)中,利用极限氧指数(LOI)、垂直水平燃烧(UL-94)、锥形量热(Cone)和万能试验机测试材料的阻燃性能和力学性能。结果表明当FA-Kaol的添加量(质量分数)达到1.5%时,EVA复合材料的阻燃性能、热稳定性能和力学性能得到有效改善。

Formamide(FA) was introduced into the interlamellar galleries of kaolinite(Kaol) and the intercalation ratio of the final product FA-Kaol reached 92.1%.The structure of the products was characterized by Fourier-transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD) and thermogravimetric analysis(TGA).The FA-Kaol was melt blended with ethylene-vinyl acetate copolymer(EVA)/intumenscent flame retardant(IFR).The flammability and mechanical properties were evaluated by limiting oxygen index(LOI) tests,vertical burning tests(UL-94),cone calorimetry(Cone) and a universal tester.The results showed that by substitution of IFR with 1.5 wt% FA-Kaol,the flame retardancy,thermal stability and mechanical performance of EVA composites were all improved significantly.