【目的】丙烯酸酯乳胶膜在成膜致密性、吸水率和热性能等方面存在不足，限制了其在高耐水水性涂料中的进一步应用。【方法】利用种子乳液聚合技术构筑以刚性聚甲基丙烯酸甲酯（PMMA）为核层聚合物、以柔性聚丙烯酸丁酯（PBA）为壳层聚合物的核壳结构聚丙烯酸酯乳胶，系统研究了核层 PMMA粒径及含量对复合乳胶膜性能的影响。【结果】核壳结构的构筑有利于提升聚丙烯酸酯乳胶的综合性能，乳胶膜的吸水率随核粒径和 PMMA含量增加呈先降后升趋势。当 PMMA核的粒径为 98. 3 nm、含量为 30%时，复合乳胶膜结构最致密，耐水性最佳；利用反应型乳化剂替代传统乳化剂后，复合乳胶膜吸水率进一步降至 11. 11%。【结论】PMMA核粒径和含量对复合乳胶膜性能具有显著影响，可通过调节此参数并进一步引入反应型乳化剂，以改善乳胶膜致密性和耐水性。

［Objective］Acrylate latex films have limitations in film compactness，water absorption and thermal properties，which restrict their further application in waterborne coatings requiring high water resistance.［Methods］ A core-shell polyacrylate latex was prepared by seeded emulsion polymerization using rigid poly（methyl methacrylate）（PMMA）as the core polymer and flexible poly（butyl acrylate）（PBA）as the shell polymer. The effects of PMMA core particle size and content on theproperties of the composite latex films were systematically investigated.［Results］The construction of the core-shell structure was beneficial for improving the overall performance of the polyacrylate latex.The water absorption of the latex films first decreased and then increased with the increase of PMMAcore particle size and PMMA content. When the PMMA core particle size was 98. 3 nm and the PMMA content was 30%，the composite latex film exhibited the densest structure and the best water resistance.After the conventional emulsifier was replaced with a reactive emulsifier，the water absorption of the composite latex film was further reduced to 11. 11%.［Conclusion］The particle size and content ofPMMA cores significantly affected the properties of the composite latex films. The compactness andwater resistance of the latex films could be improved by adjusting these parameters and furtherintroducing a reactive emulsifier.