淀粉与丙酸乙烯酯水相酯化反应的研究

摘要

以丙酸乙烯酯为酯化剂制备丙酸酯淀粉,研究了工艺参数对淀粉酯化反应的影响,以提高淀粉丙酸酯化反应效率,其中探讨的主要工艺参数有反应介质、pH值、反应温度、反应时间以及酯化剂用量。实验结果表明,在碱性催化条件下,丙酸乙烯酯与淀粉在水相中反应效率最大,适宜的pH值为8～9,反应温度在40℃左右为宜,反应精准时间为6 h。%In order to improve the properties of esterified starch used as warp sizing agents,the paper clarified the influence of process parameters such as reaction medium,pH value,reaction temperature,reaction time and vinyl propionate amount by using vinyl propionate as esterifying agent.The maximum efficiency of propionylation of starch with vinyl propionate was reached using sodium hydroxide as catalyst in an aqueous medium.The pH of the reaction system was adjusted to 8~9,the temperature was about 40 ℃ and the reaction time of 6 h is sufficient for propionylation by this method.