淀粉基减水剂的合成与性能研究.pdfVIP

学兔兔 新 建巍钰拇 全国中文核心期刊 淀粉基减水剂的合成与性能研究 石从黎，李林涛，宋开伟 (重庆市建筑科学研究院，重庆 400015) 摘要：根据淀粉的化学性质及高效减水剂的作用机理，以玉米淀粉为原料，采用硫酸酯化的方法合成出 种以脱氧葡萄糖长链 为憎水基， 基和磺酸基为亲水基的缓凝型减水剂(sT)。试验结果表明，sT的最佳合成参数为：m(淀粉)：m(N，N一 甲基甲酰胺用 量)：m(硫酸酯化试剂)=1：2：O．5，反应温度9O qC，反应时问3 h。红外光谱分析结果表明，sT分子结构上成功引入_，碳酸基团。sT对水 泥的分散性能和砂浆减水率都明显优于荼系高效减水剂FDN，且对混凝士28 d强度有明显的增强作用。 关键词：淀粉；高效减水剂；合成；分散性能：增强 中图分类号：TU528．042．2 文献标识码：A 文章编号：1001—702X(20l 1)04—0065—04 Synthesis and performance of starch-based water——reducing agent SH1 Congli，LI Lintao，SONG Kaiwei (Chongqing Institute of Building Research，Chongqing 4000 1 5，China) Abstract：According to the chemical property of starch and effective mechanism of high—efficienc) water—reducing agent，a new-type water—reducing retarder(ST)contained hydrophobic groups of deoxyglncose chain and hydrophilic groups of hydroxy groups and sulphonic groups was prepared by sulfated cornstarch．The test results show that the optimum synthesize parameters of ST were that the mass ratio of partially hydrolyzed starch．N，N-dimethylformamide and sulfated agent was 1-2：O．5，the reaction temperature was 90℃，and the reaction time was 3 h．The 1R spectrmn analysis result showed that sulphonic groups were introduced into molecular structure，and the dispersing of ST and water reducing ratio of cement mortar were superior to Naphthalene Superplasticizer(FDN)，and 28 d strength of concrete was increased obviously． Key words：starch：high——efficiency water——reducing agent：synthesis；dispersing：enhancing 虽然新型聚羧酸高性能减水剂是近年来混凝土外加剂研 基团，同时利用淀粉天然分子-丰链的疏水性，使淀粉具备了减 究领域的热点I”，但是，在当今石化资源日益