Abstract:

Sulfobutylated cellulose ether（SBC）was synthesized with cotton pulp（cellulose）and 1,4-butanesultone（BS）as raw materials. The structure of SBC was characterized by means of FT-IR，¹³ CP MAS，SEM，and XRD. The effects of degree of polymerization of cellulose，mol ratio of raw materials，reaction temperature and reaction time on water freduction unction were investigated．The mechanism of water reduction of the SBC was studied by investigating surface tension of the water-reducing agent aqueous solution and ζ-potential of water-SBC-cement system. The water-reducing agent hardly changed the water surface tension，its tropism on the interface of gas- liquid was very small，and there was a lack of the effect of attracting gas for the cement. The result of attaching SBC to the surface of cement particles made the cement particles carry identical electric charge and repulse each other，and finally become well dispersed to cause water reduction.

摘要：

以纤维素棉桨粕和1,4-丁烷磺内酯（BS）为原料合成了丁基磺酸纤维素醚减水剂（SBC）。采用红外光谱（FTIR）、¹³C固体碳谱（¹³ CP MAS）、扫描电镜（SEM）、X衍射（XRD）等对产品结构进行了表征，并考察了纤维素聚合度、原料配比、反应温度、反应时间等合成工艺参数对SBC减水剂减水性能的影响。从丁基磺酸纤维素醚减水剂水溶液的表面张力和水-SBC-水泥体系的ζ电位等方面研究了SBC减水剂的减水机理。研究结果表明：SBC减水剂几乎不改变水的表面张力，它们在气-液界面的取向能力很小，对混凝土没有引气作用；SBC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。