高取代度羧甲基淀粉的合成及应用研究Ⅰ.高取代度羧甲基淀粉的合成

Synthesis and Application of Carboxyl Methyl Starch with High Degree of Substitute Ⅰ. Synthesis of Carboxyl Methyl Starch with High Degree of Substitute

首次研究成功了一套在甲醇存在下，在碱性介质中进行氯乙酸与淀粉反应合成取代度（ＤＳ）１．０至３．０的羧甲基淀粉（ＣＭＳ）的新工艺，优化反应条件为：投料比：淀粉∶一氯乙酸∶氢氧化钠＝１∶１∶２（摩尔比），反应温度５０℃，反应时间５ｈ，反应率为９０％以上。

In the presence of methanol, the new technology of preparing carboxyl methyl starch (CMS) with the degree of substitution from 1.0 to 3.0 was designed and used in the alkali media. The reaction optimum condition was that the ratio of the raw materials was starch: 4 (mono)chloroacetic acid∶sodium hydrate=1∶1∶2, the temperature was 50℃, the time was 5h, the yield was over 90%.