绿色低成本脂肪族高效减水剂的合成及性能

摘要

通过使用粗亚硫酸钠含量为65%的工业副产品部分取代无水亚硫酸钠作为磺化剂,降低了原料成本.通过甲醛的分步控制滴加,使反应热得到控制释放,提供了合成所需热量,达到产品的无热源法生产;通过水的分步加入即变浓度法生产工艺的应用,进一步节约能耗.通过原材料配比及合成工艺对产物减水性能的研究,确定了合成低成本绿色脂肪族高效减水剂HLC-RS的最佳原材料配比为:n(甲醛):n(丙酮):n(无水亚硫酸钠):n(粗亚硫酸钠)=2.6:1.0:0.5:0.6;合成工艺为:缩合温度80℃,缩合时间4h,其中水分3次加入,甲醛分步控温滴加.%The industrial by-product containing 65％ rough sodium sulfite was used as sulfonating agent to partly replace the anhydrous sodium sulfite to reduce the cost of raw material. The formaldehyde was dropped by several steps to control the heat of chemical reaction, provide the heat required for synthetics and achieve non heat source process production.The concentrationchanging method was applied during the process to depress the consumption of energy.The optimum prescription of the HLC-RS low-cost green sulfonated acetone-formaldehyde superplasticizer was as follows:n(formaldehyde)∶n(acetone)∶n(anhydrous sodium sulfite) ∶n (rough sodium sulfite)=2.6∶1.0∶0.5∶0.6. The reaction temperature was 80 ℃ and the reaction time was 4 hours. The water was added in three times and the formaldehyde was dropped by several steps.