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

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。

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

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.