Abstract: Styrene-acrylate re-dispersible powders were prepared by spray drying process. The influence of inlet temperatures of, drying room on the performances of styrene-acrylate-dispersible powders wereninvestigated. The results showed that the drying temperature had significant influence on the appearance,particle size, water content, re-dispersibility and film-forming ability of the powder. With the temperature increasing, the water content and particle size of the polymer powders were decreased while re-dispersibility,film-forming ability were improved, and also water absorption was increased. A higher( 160 ℃)or a lower (100 ℃)temperature resulted in forming larger polymer particles, leading higher filter residue content.It was found that the proper temperatures for spray drying of styrene -acrylate emulsion were at 120~140 ℃.The analysis of FT-IR showed that the molecular structures of the polymer after drying were not changed at the temperature of 100~160 ℃. The analysis of SEM showed that film of the redispersible emulsion became more dense as the drying temperature increased.

Key words: styrene-acrylate emulsion, re-dispersible emulsion powder, spray drying temperature, SEM

摘要： 采用喷雾干燥法制备苯-丙可再分散乳胶粉。探讨了干燥室进口温度对制备苯-丙可再分散乳胶粉及其性能的影响。结果表明，进口干燥空气的温度对乳胶粉的外观、粒径、含水率、再分散性、成膜性能、吸水率有较大影响。干燥温度升高，可再分散乳胶粉含水率降低，再分散液粒径减小，再分散性、成膜性都变好，吸水率提高。但温度过高(160°C)和过低(10°C)会使乳胶粒子在干燥过程中形成粒径较大的聚合物颗粒，导致粉体滤渣含量增加，对于苯-丙乳液来说，适当的喷雾干燥温度是120~140°C。红外光谱图表明:在10~160°C下的干燥没有明显改变乳胶粒子的分子结构。SEM图分析表明:干燥温度越高，再生膜越致密。

关键词: 苯-丙乳液, 可再分散乳胶粉, 喷雾干燥温度, SEM