氨基甲酰乙基淀粉的半干法制备

Preparation of carbamoylethyl starch using a semi-dry process

以水为反应介质 ,在氢氧化钠碱催化剂存在下 ,半干法制备了氨基甲酰乙基淀粉。考察了碱用量、反应温度、反应时间、丙烯酰胺浓度对反应效率和取代度的影响。当淀粉为 5 .7g、丙烯酰胺 2 .2g、水 2mL时 ,最佳反应条件为 :氢氧化钠 /葡萄糖剩基的摩尔比为 0 .32、反应温度 60℃、反应时间 2h ,此时取代度可达 0 .64 ,反应效率为 64 %。随着丙烯酰胺浓度的提高 ,取代度逐渐增加 。

In the presence of sodium hydroxide and in water reaction medium,carbamoylethylstarch was prepared by using a semi-dry process.The effects of sodium hydroxide,reaction temperature,reaction time,acrylamide concentration on the reaction efficiency and degree of substitution were studied.When the amount of starch,acrylamide and water are 5.7 g,2.2 g and 2 mL respectively,the optimum reaction conditions are as follows:the sodium hydroxide/anhydroglucose unit molar ratio is 0.32,reaction temperature,60℃,and reaction time,2 h.Under these conditions the degree of substitution is 0.64,the reaction efficiency is 64%.The degree of substitution increases with increasing acrylamide/starch unit molar ratios,the reaction efficiency decreases with increasing acrylamide/starch unit molar ratios.