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以纤维素棉桨粕经酸水解得到具有确定聚合度的微晶纤维素(MCC)为原料,在氢氧化钠活化下,与1,4-丁烷磺内酯(BS)反应,得到了具有良好水溶性的丁基磺酸纤维素醚(SBC)减水剂。采用红外光谱(FT-IR)、核磁共振谱(NMR)、扫描电镜(SEM)、X射线衍射(XRD)等分析方法对产品结构进行了表征,并考察了MCC聚合度、原料配比、反应温度、反应时间、悬浮剂种类等合成工艺条件对产品减水性能的影响。结果表明:当原料MCC聚合度为45,反应物物质的量比为:AGU(纤维素葡萄糖苷单元)∶n(NaOH)∶n(BS)=1.0∶2.1∶2.2,悬浮剂为异丙醇,原料室温活化时间为2 h,产物合成时间为5 h,温度为80℃时,所得产品丁磺酸基取代度最高,产品减水性能最优。
The cellulose cotton pulp meal was acid hydrolyzed to obtain microcrystalline cellulose (MCC) with definite degree of polymerization as the raw material, reacted with 1,4-butane sultone (BS) under the activation of sodium hydroxide, A good water-soluble butyl cellosolve ether (SBC) water reducer. The structure of the product was characterized by FT-IR, NMR, SEM and XRD. The effects of polymerization degree of MCC, ratio of raw materials, reaction time Temperature, reaction time, the type of suspending agent and other synthetic process conditions on the water reduction performance of the product. The results showed that when the degree of polymerization of MCC was 45, the ratio of reactants was AGU (cellulose glycoside unit): n (NaOH): n (BS) = 1.0: 2.1: 2.2 and the suspending agent was isopropanol , The activation time of raw materials was 2 h at room temperature, the product synthesis time was 5 h and the temperature was 80 ℃, the highest degree of substitution of butane sulfonate was obtained.