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以纤维素棉桨粕为基材,氯磺酸为磺酸试剂,二氯甲烷为分散剂,一步法合成了磺化纤维素(CS)。采用红外光谱(FTIR)、核磁共振碳谱(13CNMR)、扫描电镜(SEM)、X-衍射(XRD)等分析手段对产品结构进行了表征,并考察了纤维素聚合度、原料配合比、反应温度、反应时间等合成工艺参数对CS减水剂分散性能的影响。从CS减水剂水溶液的表面张力和CS-水-水泥体系的ζ电位等方面研究了CS减水剂的分散机理。研究结果表明:CS水溶液的表面张力随着CS减水剂浓度的增加而降低,它们在气-液界面的取向能力大,对混凝土有一定的引气作用;CS减水剂在水泥颗粒表面吸附的结果,使水泥颗粒表面带有相同电荷而相互排斥造成水泥颗粒的分散,从而出现减水效果。
Using cellulose cotton pulp as substrate, chlorosulfonic acid as sulfonic acid reagent and dichloromethane as dispersant, sulfonated cellulose (CS) was synthesized in one step. The structure of the product was characterized by FTIR, 13C NMR, SEM and XRD. The effects of cellulose polymerization degree, raw material ratio, reaction time Effect of synthesis parameters such as temperature, reaction time on dispersion of CS water reducer. The dispersion mechanism of CS water reducer was studied from the surface tension of CS water reducer aqueous solution and the zeta potential of CS-water-cement system. The results show that the surface tension of CS aqueous solution decreases with the increase of CS water reducer concentration, and their orientation ability at gas-liquid interface is large, and the air-entraining effect of concrete is enhanced. CS water reducer adsorbs on the surface of cement particles Of the results, so that the surface of cement particles with the same charge and mutual exclusion caused by the dispersion of cement particles, resulting in water reducing effect.