通过添加甲基丙烯酸-β-羟丙酯（HPMA）和甲基丙烯酸（MAA），制备了软核硬壳的丙烯酸酯聚合物乳液及其可再分散乳胶粉，讨论了HPMA用量对乳液和乳胶粉的成膜性、再分散稳定性和耐水性等性能的影响．实验结果表明，HPMA添加量（质量分数，下同）为1．2％时，在保证再分散稳定性的同时得到的丙烯酸酯原乳液及可再分散乳胶粉的成膜性好，耐水性最优；吸光度测试显示HPMA添加量小于等于1．2％时，乳胶粉再分散稳定性好，分散度达90％，吸光度平均变化小于10％；差示扫描量热（DSC）测试显示丙烯酸酯聚合物乳液胶膜有6．98和30．11℃两个玻璃化转变温度，乳胶粒子具有两相结构；透射电镜测试表明合成的乳液粒子有核壳结构；扫描电镜测试显示原乳液和乳胶粉成膜性能优异，合成的原乳液在成膜过程中发生了微相分离，进一步说明了合成的乳液具有核壳结构．

Acrylate polymer latices with soft core and hard shell were synthesized via the emulsion polymerization of β-hydroxy propylmethacrylate （HPMA） and methacrylic acid （ MAA）, and the corresponding re-dispersible powder was also prepared. Moreover, the influence of HPMA dosage on the film-forming ability, the re-dispersibility and the water resistance of the original latex and its re-dispersible powder were discussed. Experimental results show that, at a HPMA dosage of 1.2% （mass fraction, the same below） , the film-forming ability and the water resist- ance behavior of the original latex and its re-dispersible powder are optimal and the re-dispersibility is well maintained. The absorbance analysis indicates that, when the HPMA dosage is not more than 1.2%, the powder possesses excellent re-dispersibility, high dispersity （ up to 90% ） and small mean absorbance variation （ less than 10% ）. DSC results show that the film of the original latex is of two glass transition temperatures; one is 6. 98℃ and the other is 30. 11 ℃, which means that the polymer particles have a two-phase core-shell configuration. This configuration is also verified by TEM photographs. Moreover, SEM results demonstrate that both the original latex and the re-dispersible powder are of excellent film-forming ability, and that micro-phase separation occurs during the film-forming of the original latex, which further testifies the core-shell configuration of the latex.