微波辅助阳离子瓜尔胶的合成研究

Study on microwave-assisted synthesis of cationic guar gum

以瓜尔胶为原料,3-氯-2-羟丙基三甲基氯化铵为醚化剂,氢氧化钠为催化剂,异丙醇作为溶剂,利用微波辅助合成了阳离子瓜尔胶。结果表明,在瓜尔胶醚化过程中使用微波辅助,反应时间是传统阳离子瓜尔胶合成方法的1/6,提高了反应效率。最佳反应条件为:溶剂选用85%异丙醇,微波功率300 W,微波辐射时间为30 min,反应温度40℃,醚化剂与瓜尔胶的物质的量比为0.25,碱与瓜尔胶的物质的量比为0.20。产物水溶性很好,可与表面活性剂复配。

Cationic guar gum（CGG） was obtained by means of microwave-irradiation using guar gum as raw materials ,3-chloro-2-（hydroxypropyl） trimethylammonium chloride as cationic etherifying agent, sodium hydroxide as catalyst and isopropanol as solvent. Experimental results showed that comparing with traditional synthesis method,the reaction time decreased to 1/6 and the rate of reaction efficiency increased by using microwave. The synthesis conditions were optimized as follows：isopropanol as solvent, reaction power 300 W, reaction temperature 40 ℃, radiation time 30 rain, n （etherifying） ： n （CGG） = 0.25, n（ NaOH）： n（CGG） =0.20. The product had good water-solubility and good compatibility with surfactants.