中文摘要：

在三聚氰胺氰尿酸盐（MCA）传统的合成工艺中加入SiO2溶胶, 制备改性MCA（mMCA）, 再将其与尼龙6（PA 6）熔融共混制备阻燃PA 6复合材料, 研究了其阻燃性能。结果表明： 随着mMCA中SiO2含量的增加, 复合材料的极限氧指数（LOI）先增加后降低；在mMCA中引入SiO2后复合材料的自熄时间降低, 当mMCA含量（质量分数）为8%时复合材料达到UL 94 V--0自熄标准；在mMCA中引入SiO2可减少复合材料燃烧时熔滴的产生和促使无焰熔滴的形成, 改善炭层结构, 提高复合材料的阻燃性能。

英文摘要：

As a modifier, silica sol was introduced into the traditional melamine cyanurate （MCA） preparation process and therewith modified MCA （mMCA） was prepared. mMCA was blended with nylon 6 （PA 6） to prepare flame retardant PA 6 composites and the flame retardant properties were investigated. The results show that silica sol may contribute to the enhancement of flame retardant property. With the increase of silica sol content, the limited oxygen index （LOI） of PA 6/mMCA composites increase firstly and then decrease, and the self-extinguishing time decreases. In the presence of silica sol, the amount of drippings can be reduced, the formation of non-flame dripping increases and the char structure can be improved.