石墨烯气凝胶复合防火织物的热防护性能

Thermal protective performance of composite flame retardant fabrics treated by graphene aerogel

为进一步提高热防护服的综合性能,使其满足高防护性兼具低热蓄积的需求,利用改进的Hummers法制备了一种密度小、导热率低、隔热效果好的石墨烯气凝胶材料,并研发复合防火织物系统,在低辐射热环境下探讨不同厚度的石墨烯气凝胶的隔热效果。结果表明:加入石墨烯气凝胶的复合防火织物具有较好的热防护性能,可将人体产生热损伤的时间延长约203%,将人体产生二度烧伤的防护时间延长约218%,防火织物的防护性能与石墨烯气凝胶的厚度呈非线性关系;石墨烯气凝胶复合防火织物的平均透湿率保持在10.4 g/(m^2·24 h),与复合防火织物的透湿性没有显著差异,石墨烯气凝胶的加入不影响防火织物整体的透湿性。

To further improve the comprehensive performance of thermal protective clothing and meet the needs of increasing thermal protection with reduced heat storage,a type of graphene aerogel material with low density,low thermal conductivity and good heat insulating property was prepared by the modified Hummers method,and a composite flame retardant fabric system was constructed.The thermal protective performance of graphene aerogel with different thickness was measured in a low radiation condition.The results show that the flame retardant composite fabrics with graphene aerogel block provides better thermal protective performance,with the time required to cause skin damage extending about 203%and the time required to generate skin burn extending about 218%.It is found that the relationship between the thermal protective performance and the graphene aerogel thickness is not linear.The water vapor transfer of the flame retardant composite fabrics with graphene aerogel block is around 10.4 g/(m^2·24 h),presenting no significant difference compared to fabrics untreated by graphene aerogel.