干法制备高取代度高黏度的淀粉顺丁烯二酸单酯

Synthesis of Starch Maleate with High Degree of Substitution and High Viscosity by Dry Method

设计使用原子经济性反应制备了高取代度高黏度的淀粉顺丁烯二酸单酯。首先对淀粉进行交联、碱化前处理,然后与顺丁烯二酸酐混合反应,干法制备高取代度、高黏度的淀粉顺丁烯二酸单酯。通过条件优化实验,在交联度为5%的淀粉碱化后pH=12,淀粉葡萄糖基与顺丁烯二酸酐的摩尔比n(ST)∶n(MA)=1∶0.8,含水量w(H2O)=17%,反应温度80℃,反应时间5h的条件下,得到取代度0.59的产品,反应效率74%,黏度高达28000mPa·s。这是制备生物质淀粉精细化学品的有益尝试。

Starch maleate with high degree of substitution （DS） and high viscosity was prepared by dry method. It＇s a profitable try on the atom economy of reaction. With the pretreatment of cross-linking and alkalinization, starch reacted with maleic anhydride in an oven. The optimal reaction conditions were： 5% cross-linking,pH = 12, water mass fraction 17% , reaction temperature 80 ℃ and reaction time 5 h. A starch maleate with DS of 0. 59 and viscosity of 28 000 mPa · s was obtained with a reaction efficiency of 74%.