天然高分子阳离子淀粉絮凝剂合成工艺研究

Study on synthetic craft of natural macromole cular cation starch coagulant

以3-氯-2-羟丙基三甲基氯化铵(CTA)为醚化剂,通过干法对淀粉进行改性,合成天然高分子阳离子淀粉絮凝剂。研究了体系中水的质量分数、CTA用量、CTA与NaOH的摩尔比、反应时间、反应温度对取代度和粘度的影响。最佳合成条件为:淀粉100 g,w(水)=25%,n(CTA)=0.175 mol;n(CTA)∶n(NaOH)=0.83,反应时间4 h,反应温度70℃,制得的阳离子淀粉取代度高达0.598。

The article introduced the natural cation starch which was modified using 3-chloro-2-hydroxy propyl trimethyl ammonium chloride （CTA） as the etherifying agent,and synthesized a kind of natural macromolecular cation starch coagulant. The effects of reaction conditions including water ratio, the CTA concentration, the ratio of CTA and NaOH, the reaction time and the reaction temperature on the substitution degree and viscosity were discussed. When the reaction conditions were starch 100 g. water ratio 25 %. the CTA concentration 0. 175 mol; n（CTA） ： n（NaOH） =0. 83 . the reaction time, 4 hi reaction temperature 70 ℃, the cation starch substitution ratio reached 0. 598.