水煤浆分散剂单体马来酸双聚乙二醇单甲醚酯合成及应用

采用减压熔融法合成了马来酸双聚乙二醇单甲醚酯,并对其合成工艺进行了探讨。实验以原料醇酸摩尔比、催化剂用量、阻聚剂用量、反应温度和反应时间为5因素,设计成5因素4水平的正交实验,由实验确定出最佳酯化反应条件:醇酸摩尔比2.1:1、催化剂用量4%、阻聚剂用量3%、反应温度120℃,反应时间为6 h,酯化率达到96.46%。并进一步由大单体与丙烯酸、丙烯酸丁酯、烯丙基苯磺酸钠共聚制备出水煤浆分散剂,由大同煤制浆,在分散剂掺量为0.8%,干粉煤质量分数为65%时,水煤浆黏度为1 050 mPa﹒s。

Application and Synthesis of Dipolyethylene Glycol Maleate as Coal Water Slurry

Dipolyethylene glycol maleate was synthesized by decompression melting method,and the synthetic process was discussed.Five factors were optimized,including alcohol acid mole ratio,amount of catalyst,inhibitor dosage,reaction temperature and reaction time,designing L16(45) for orthogonal experiment.The best condition was determined: alcohol acid mole ratio is 2.1:1,the amount of catalyst is 4%,the inhibitor dosage is 3%,the reaction temperature is 120 ℃ and the reaction time is 6 h,the esterification rate reaches 96.46%.The macromonomer copolymerized with acrylic acid,butyl acrylate and sodium allylsulfonate,to produce coal water slurry.The pulp was made by Datong,coal water slurry viscosity is 1 050 mPa﹒s when the dispersant dosage is 0.8% and the mass fraction of dry pulverized coal is 65%.