摘要
研究了以棉短绒（精制棉）为原料、氯乙酸为醚化剂,合成羧甲基纤维素钠。探索了纤维素在碱化、醚化阶段的反应机理。考察了渗透剂、氢氧化钠溶液浓度及其用量、醚化时间4种因素对所合成羧甲基纤维素钠的水溶液粘度的影响。通过检测醚化后羧甲基纤维素钠的取代度和2%水溶液的粘度,确定了最佳工艺条件：碱化温度为30~35℃,碱化时间为50 min,醚化温度为70~75℃,醚化时间为70 min,碱溶液浓度为25%,渗透剂添加量为3%。此条件下制备的羧甲基纤维素钠,水溶液浓度为2%时,粘度达到600~650 MPa.s,取代度为0.530~0.560。
To study carboxymethylation reaction of cellulose using phase transfer catalyst and chloroacetic acid and the mechanism of alkalization etherification of carboxy methyl cellulose.The effect of catalyst,sodium hydroxide concentration and dosage,and etherification time on the viscosity of carboxymethyl cellulose sodium solution was investigated.Substitution degree of carboxymethyl cellulose sodium and viscosity of 2% solution was measured under different conditions.At alkalization temperature 30~35 ℃,alkalization time 50 min,etherification temperature 70~75 ℃,etherification time 70 min,NaOH concentration 25 %,catalyst dosage 3%,the viscosity was up to 600~650 MPa·s,substitution degree was 0.530~0.560.
出处
《河北化工》
2012年第2期46-49,共4页
Hebei Chemical Industry
关键词
羧甲基纤维素钠
羧甲基
氯乙酸
相转移催化
碱化
醚化
carboxymethyl cellulose
cellulose
chloroacetic acid
phase transfer catalysis alkalization
etherification
