采用离心喷雾干燥工艺对聚羧酸减水剂进行粉体制备研究，得到的减水剂粉体含固量可达到99%（质量分数，下同）.通过红外光谱分析发现：聚羧酸减水剂分子结构中的羰基在干燥过程中发生了部分分解，但减水剂宏观性能仅受有限影响，粉体减水剂的性能与液态减水剂基本相当.通过单因素试验研究了干燥室进口风温、进料液温度、进料液含固量对喷雾干燥工艺及粉体性能的影响，确定了喷雾干燥工艺适宜的参数范围为干燥室进口风温180~220℃，进料液温度20~40℃，进料液含固量20%~60%.

The preparation of powder polycarboxylate superplasticizer by centrifugal spray drying process was discussed. The powder solid content(by mass) of the product can reach 99%. Through infrared spectroscopy the carbonyl group has been shown to be partly decomposed during the drying process which has only limited influence on the performance of the powder with the result that its performance is at the same level compared to the liquid superplasticizer. Based on single factor experiments, the major parameters affecting the drying process were discussed and the appropriate process conditions were obtained, e.g. the import air temperature of drying chamber must be controlled at 180220℃；the spraydrying feed temperature controlled at 2040℃, and solid content of polycarboxylate superplasticizer fed is in the range of 20% to 60%.

国家自然科学基金资助项目（50972170）