摘要： 研究了防火涂料基料树脂聚丙烯酸酯玻璃化转变温度、相对分子质量、乳胶粒径与炭化层结构以及防火性能之间的联系。研究结果表明，基质树脂玻璃化转变温度越低，乳胶粒子的平均粒径越小，防火涂料的耐火性能就越好；选用相对分子质量 6.8万左右的基料树脂能得到泡孔分布均匀、整体强度较好的炭化层结构，并且防火涂料耐火性能也较好。

关键词: 水性膨胀型防火涂料, 聚丙烯酸酯, 炭化层结构, 防火性能

Abstract: The relationships between the glass transition temperature, molecular weight and particle diameter of the resin binder of polyacrylate latex, structures of the carbonized layers and the fire-retardant properties were studied. Results showed that with the decrease of the glass transition temperature and the size of the latex particles of the resin binder, the fire-retardant properties were improved.Additionally,when the molecular weight was about 68 000, a carbonized layer with well-distribute inner bubbles and high overall strength was formed. and the fire-retardant properties were also good.

Key words: waterborne intumescent fire-retardant coating, polyacrylate, structure of carbonized lay-er, fire-retardant property