羟丙基瓜尔胶在离子液体中的制备.pdf

第24卷第9期
化学研究与应用
Vol. 24. No 9
2012年9月
Chemical Research and Application
Sep.,2012
文章编号:1004-1656(2012)09-14461-04
羟丙基瓜尔胶在离子液体中的制备
战振生',尹恒2,杜彬,康如坤,崔平
1.四川大学高分子研究所,四川成都610065;
2.京昆油田科技开发公司,江苏昆山215300;
3.中国石油华北油田分公司,河北任丘062552)
摘要:本文以离子液体1-烯丙基3-甲基咪唑氯盐( Amimcl)为反应介质,以氢氧化钠为催化剂合成了羟丙基
瓜尔胶(HPG),并通过'HNMR确定了产品的摩尔取代度。探讨了水的用量、环氧丙烷的用量、反应温度和反
应时间对摩尔取代度的影响。在水与瓜尔胶的质量比为1.7、氢氧化钠与瓜尔胶的质量比为5%、环氧丙烷与
瓜尔胶的质量比为3.5、反应温度为60℃和反应时间为12h的条件下,摩尔取代度(MS)可以达到0.76。同时
发现在不加催化剂NaOH的情况下,瓜尔胶在 Amimcl中的羟丙基化反应同样可以发生,只是得到的HPG的
MS相对较小。
关键词:羟丙基瓜尔胶、离子液体、摩尔取代度、1烯丙基-3-甲基咪唑氯盐
中图分类号:0636.12文献标识码:A
Preparation of hydroxypropyl guar gum in ionic liquid
ZHAN Zhen-sheng YIN Heng", DU Bin, KANG Ru-kun', CUI Ping
(1.Polymer Research Institute, Sichuan University, Chengdu 610065, China
2. Jingkun Chemistry Company, Kunshan 215300, China;
3. Huabei Oilfield Branch of Petrochina, Rengiu 062552, China)
Abstract In this paper, hydroxypropyl guar gum(HPG)was successfully prepared in an ionic liquid 1-allyl-3-methylimidazolium
chloide with so um y oxide as ct al st, and te molar substitution degree(MS )was determined by means of H NMR spectrosc-
Py. The effects of the dosage of the water, the dosage of the propylene oxide, reaction temperature and reaction time on MS of HPG
were investigated. The HPG with the MS value of 0. 76 could be obtained under conditions of the mass ratio of water to guar gum
1. 7, that of NAOH to guar gum 5%, that of propylene oxide to guar gum 3. 5 when the reaction was heated at 60C for 12h. In addi
tion, the hydrox proplation of the guar gum could e cared out without NAOH as catalyst using Amimc] as a reaction medium
Key words: hydroxypropyl guar gum; onic liquid; the molar substitution degree 1-allyl-3-methylimidazolium chloride
瓜尔胶(CG)是从瓜尔豆中分离出来的一种不溶物含量高和粘度不易控制等缺点,人们常利
半乳甘露聚糖。它是目前已知的水溶性最好的天用化学手段改变其理化特性以满足实际工业生产
然高分子化合物之一,可以在低浓度下表现出很的需要,其中对瓜尔胶进行羟丙基化改性是一种
高的粘度,广泛应用于造纸、纺织、食品和石油等非常有效的手段り。羟丙基瓜尔胶(HPG)是瓜尔
行业1)。但是由于瓜尔胶原粉具有溶解较慢、水胶与环氧丙烷(PO)在碱存在的情况下发生藤化
收稿日期:2012-03-21;修回日期:2012-0509
联系人简介;崔平(1974-),男,讲师,主要从事天然高分子材料的研究与应用。E-mail: cuiping1974@ hotmail..ceom