Abstract:

In the mixed solvents of ethanol and isopropanol，3-chloro-2-hydroxypropyl trimethyl ammonium chloride（CTA）was used as etherifying agent to achieve the cationic reaction of hydroxyethyl cellulose（HEC）. The factors affecting the degree of substitution（Cds）and reaction efficiency（Cre）were investigated，and the structure of the product was identified by ¹H NMR. Cds of the product was 0.50 and the Cre reached 75%，with mass ratio m(HEC)∶m(Et.)∶m(iPA)∶ m(25%NaOH)∶m(69%CTA)∶m(Ea)= 20∶20∶70∶13∶15∶8，at 25 ℃ for 30 min activation with amine，and reaction at 60 ℃ for 4 h.

摘要：

在乙醇（Et.）和异丙醇（iPA）混合介质中，采用3-氯-2-羟丙基三甲基氯化铵（CTA）为醚化剂进行了羟乙基纤维素（HEC）的活化-阳离子化反应，对影响产物阳离子化取代度（Cds）和阳离子化效率（Cre）的因素进行了研究，并采用¹H NMR对产物的结构进行确认。结果表明，按m(HEC)∶m(Et.)∶m(iPA)∶m(25%NaOH)∶m(69%CTA)∶m(Ea)= 20∶20∶70∶13∶15∶8的配比，25 ℃时用胺碱活化30 min，60 ℃恒温反应4 h，产物的Cds为0.50，Cre达到75%。