摘要
本实验设计并合成三种聚醚聚羧酸磺酸钠(PC-1、PC-2和PC-3)大分子表面活性剂,以木质素磺酸钠(SLS)为对照,研究了分子结构对β-半水石膏水化过程及分散性的影响。结果表明,三种羧基含量不同的聚醚聚羧酸磺酸钠与SLS对β-半水石膏的凝结时间及分散性与PC系列物和SLS的掺量正相关,且其缓凝能力及其分散性的大小与羧基含量亦正相关。与SLS相比,聚醚聚羧酸磺酸钠能有效延长β-半水石膏的凝结时间,提高β-半水石膏的可操作性。PC与SLS均具有延缓水化的能力,但不会影响其最终的水化度。
Three polyether polycarboxylic sodium sulfonate （PC-1, PC-2 and PC-3 ） surfactants were synthesized. The effects of molecular structure on the hydration and the dispersibility of β-calcium sulfate hemihydrate （β-H） were studied with a comparison of PC and sodium lignosulfonate （SLS）. It was found that all assayed polymers delayed setting time and increased dispersibility of β-calcium sulfate hemihydrate in a dose dependent maner, the retarding ability and dispersibility present a positive correlation with the number of carboxylic groups in the molecules. Comparing to SLS, the PC polymers delay the setting time of β-calcium sulfate hemihydrate and improve the operability of β-calcium sulfate hemihydrate. It was found that the PC polymers and SLS possess the ability of delaying hydration, but do not change the final degree of hydration.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第2期485-491,共7页
Bulletin of the Chinese Ceramic Society
基金
"十二五"国家科技支撑计划资助项目(2011BAE30B02
2014BAE03B00)
关键词
β-半水石膏
聚醚聚羧酸磺酸钠
凝结时间
分散性
水化度
β-calcium sulfate hemihydrate
polyether polycarboxylic sodium sulfonate
setting time
dispersing
degree of hydration
