【摘要】 以废纸为原料制备羧甲基纤维素(CMC),探讨了分散剂组成、碱化温度、时间、碱用量和醚化剂用量、醚化温度、时间对产品粘度的影响。结果表明,当废纸、氢氧化钠和醚化剂的质量比为1 0∶0 9∶1 2,以85%的乙醇水溶液为分散剂,35℃碱化90min,75℃醚化150min时,生成的CMC质量最好,取代度>0.6,有效成分>85%,水分<10%,氯化物<4%,其2%水溶液的粘度>500mPa·s。更多还原

【Abstract】 The carboxymethyl cellulose(CMC) is prepared by wastepaper as raw material.The effect of composition of dispersant,alkalization temperature,time,the usage of base and chloroacetic acid,etherification temperature,etc. on viscosity of product are discussed.The results showed that when the 85% ethanol was used as dispersant,the wastepaper was alkalified at 35 ℃ for 90 min,and etherified at 75 ℃ for 150 min and the mass ratio of wastepaper to sodium hydroxide to chloroacetic acid was 1.0∶(0.9)∶1.2,the best quality of CMC product was obtained.Therein,the degree of substitution was >0.6,the mass fraction of available composition was >85%,the moisture was <10% and chloride was <4%,the viscosity of 2% CMC solution was above 500 mPa·s.更多还原