制备可再分散苯-丙乳胶粉的干燥温度探讨  

Research on Drying Temperatures for Producing Re-Dispersible Styrene-Acrylate Emulsion Powders

作　　者：吴银萍[1] 沈慧芳[1] 柯志烽[1] 夏正斌[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640

出　　处：《涂料工业》2010年第3期48-52,60,共6页Paint & Coatings Industry

基　　金：国家自然科学基金(50803017)

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℃)和过低(100℃)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℃。红外光谱图表明:在100～160℃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。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 were investigated.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.

关 键 词：苯-丙乳液 可再分散乳胶粉 喷雾干燥温度 SEM 

分 类 号：TQ630.4[化学工程—精细化工]