PE-HD／煤粉／OMMT复合阻燃材料制备及性能研究

用有机改性蒙脱土（OMMT）含量为30％（质量分数，下同）的OMMT母料及超细煤粉，通过双螺杆熔融挤出法制得了组成不同的系列PE-HD／煤粉／OMMT复合阻燃材料。用X射线衍射分析、极限氧指数测定等对其插层结构及阻燃性能进行了表征。结果表明，PE-HD／煤粉／OMMT复合材料中OMMT呈现插层型结构，煤粉的加入可以提高复合材料的阻燃性。当煤粉和OMMT含量分别为15％和4．5％时，PE-HD／煤分／OMMT复合材料极限氧指数最高达到21％。热重分析及扫描电子显微镜分析表明，PE-HD／煤粉／OMMT复合阻燃材料阻燃性能的提高归因于大量致密层状炭结构的形成。

Preparation and Properties of PE-HD/Coal/OMMT Flame Retardant Composites

A series of PE-HD/COal flour/OMMT composites was prepared using a co-rotating twin screw extruder, in which OMMT was used as a 30 wt% rnasterbatch. XRD revealed an intercalated morphology in PE-HD/coal/OMMT composites. The coal flour increased the inflammability of PE-HD/OMMT composites in a large extent. When the composition contained 15 wt% coal and 4.5 wt% OMMT, a limited oxygen index of 21% was achieved. The further analysis of TG and SEM demonstrated that the improvement of inflammability of PE-HD/coal/OMMT composites was due to the formation of an enriched carbon/clay char with densification lamellose structure during combustion.