阳离子羟乙基瓜尔胶的合成及其造纸湿部应用  

Synthesis of Cationic Hydroxyethyl Guar Gum and Its Application in Wet-end Process of Papermaking

作　　者：万小芳[1] 李友明[1] 宋林林[1] 王艳霞[1] 

机构地区：[1]华南理工大学资源科学与造纸工程学院,广东广州510640

出　　处：《精细化工》2006年第7期707-710,共4页Fine Chemicals

摘　　要：对一步泥浆法合成新型助留助滤剂———阳离子羟乙基瓜尔胶(CEG),及将其用于废新闻纸浆的抄造过程进行了探讨。悬浮于醇/水体系中的瓜尔胶,先与阳离子单体发生醚化反应,然后与氯乙醇在微过量碱催化剂存在下进行羟乙基化反应,阳离子中间产物不必分离。重点研究了阳离子醚化产物的黏度及氮质量分数的影响因素,确定了阳离子化反应优化条件为:m(阳离子单体)∶m(瓜尔胶)=0.4∶1,m(NaOH)∶m(瓜尔胶)=0.25∶1,反应温度60℃,反应时间2.5 h。经红外光谱分析,证实了接枝产物中季铵阳离子基团的存在。由于CEG分子结构同时含有季铵阳离子和非离子的活性羟基,CEG常温水合作用进一步强化,w(CEG)=1%的水溶液的透光率增加到80%。当以w(CEG)=0.2%(以绝干浆计)的用量添加到废新闻纸浆中,细小组分的单程留着率提高了40%,打浆度减少了37%。A new type drainage and retention aid-cationic hydroxyethyl guar gum （CEG） was synthesized in one-step and its application in the papermaking process of recycled newspaper pulp was discussed. Suspended in alchol/water solution, guar gum （GG） was grafted at first with quarternaryammonium cationic monomer, and then reacted with chlorohydrin in the presence of tiny-excessive alkali catalyst. Optimal parameters of the cationic graft reaction were m（cationic monomer）：m（GG） = 0. 4：1, m （NaOH） ： m （GG） = 0. 25：1, reaction temperature 60 ℃ and reaction time 2. 5 hours. Infrared spectroscopy showed the modified guar gum carrying cationic group. Due to the quarternary-ammonium group as well as the active hydroxyl nonionic group, CEG was much easier to dissolve in water as compared with unmodified guar gum. The ω（CEG） = 1% aqueous solution exhibited good clarity with light transmittance of 80% at 625 nm and good viscosity stability. At the dosage of ω（CEG） = 0. 2% （relative to dried pulp）in the paper pulp suspensions of recycled newspaper, the first past retention （FPR） was improved by 40% .and the drainage degree was reduced by 37%.

关 键 词：瓜尔胶 阳离子接枝反应 羟乙基化反应 助留助滤 

分 类 号：TS727.2[轻工技术与工程—制浆造纸工程]