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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。
Cellulose butyl ether sulphate superplasticizer (SBC) was synthesized from cellulose cotton pulp and 1,4-butane sultone (BS). The structure of the product was characterized by FTIR, 13C MAS, SEM and XRD. The effects of cellulose polymerization degree, raw material ratio, reaction temperature , Reaction time and other synthetic process parameters on the water reducing performance of SBC superplasticizer. The water reducing mechanism of SBC superplasticizer was studied from the surface tension of aqueous solution of butyl sulfonic acid ether superplasticizer and the zeta potential of water-SBC-cement system. The results show that: SBC superplasticizer almost does not change the surface tension of water, their orientation at the gas-liquid interface is very small, there is no air entraining concrete; SBC superplasticizer adsorption on the surface of cement particles, so that cement particles Surface with the same charge and mutual exclusion caused by the dispersion of cement particles, resulting in water reducing effect.