毛竹笋壳制备羧甲基纤维素

摘要

In this study carboxymethyl cellulose was successfully synthesized from bamboo shoot shell wastes using four-times alkalization method. The raw material and products were characterized by FTIR,XRD,TGA and SEM. The results showed that the optimal preparation conditions were pretreated cellulose 5 g,sodium hydroxide 5 g,chloroacetic acid 6 g,85%ethanol as solvent,first basification temperature and time were 30 ℃ and 90 min with 80% of total sodium hydroxide,the remaining 20% was averagely divided into three parts to add during the etherification process,final etherification temperature and total etherification time were 70℃and three hours. Under the optimized reaction conditions,the substituting degree of carboxymethyl cellulose obtained reached 0.9341 and the viscosity was 35 mPa·s.%以废弃毛竹笋壳为原料，经过4次加碱法制备出了羧甲基纤维素，并通过FTIR、XRD、TGA、SEM手段对原料与产品进行了表征。实验结果表明，制备羧甲基纤维素的最佳工艺条件为精制竹笋壳5 g，氢氧化钠5 g，氯乙酸6 g，85%乙醇溶液为溶剂，第1次碱化温度和时间分别为30℃和90 min，加入氢氧化钠总质量的80%，后3次碱化是在醚化过程中平均加入剩余20%的碱，醚化最终温度为70℃，醚化总时间为3 h。在此工艺条件下，所得到的羧甲基纤维素的取代度为0.9341，黏度为35 mPa·s。