不同长度侧链的梳状结构聚羧酸盐的合成及其对新拌水泥浆体性能的影响

发布时间：2018-06-06 01:07

本文选题：聚羧酸减水剂 + 合成　；参考：《硅酸盐学报》2015年05期

【摘要】：通过自由基聚合反应合成了3组主链聚合度基本相同、侧链长度不同的梳状结构聚羧酸盐,对其表面张力和对水泥浆体流动性的影响进行了测试,并研究了其对硅酸盐水泥及添加不同品种和掺量的辅助性胶凝材料的水泥浆体的液相表面张力、流动性及Zeta电位的影响。结果表明:其它实验条件不变、主链聚合度相同的情况下异戊烯醇聚氧乙烯醚(TPEG)与α-甲基丙烯酸(α-MAA)的摩尔比从1:1增加到5:1,合成的聚羧酸盐的表面张力从47.70 m N/m降低至35.53 m N/m,添加到水泥净浆中时初始流动度从280 mm增大至310 mm;随着辅助性胶凝材料和聚羧酸减水剂掺量的增加,水泥浆体的液相表面张力减小、流动性增强;当水胶比从0.5降到0.3,水泥浆的Zeta电位呈现上升趋势,浆体稠度变大,Zeta电位变化更明显;水胶比为0.3时,水泥浆体的Zeta电位值随着辅助性胶凝材料和聚羧酸减水剂掺量的增加呈现下降趋势。
[Abstract]:Three groups of comb-like polycarboxylate with the same degree of main chain polymerization and different side chain length were synthesized by free radical polymerization. The surface tension and the effect on the fluidity of cement paste were tested. The effects of Portland cement on liquid surface tension, fluidity and Zeta potential of cement paste with different kinds of auxiliary cementitious materials were studied. The results show that other experimental conditions remain unchanged. The molar ratio of isopentenol polyoxyethylene ether (TPEG) to 伪 -methacrylic acid (伪 -MAA) increased from 1:1 to 5: 1, and the surface tension of the synthesized polycarboxylate decreased from 47.70 mm / m to 35.53 mn / m, which was added to the cement paste. The initial fluidity increased from 280 mm to 310 mm, and with the increase of the amount of auxiliary cementing materials and polycarboxylic acid superplasticizers, The liquid phase surface tension of cement paste decreases and the fluidity increases, when the water-binder ratio decreases from 0. 5 to 0. 3, the Zeta potential of cement slurry increases, and the change of Zeta potential is more obvious when the water / binder ratio is 0. 3. The Zeta potential of cement paste decreased with the increase of the content of auxiliary cementitious material and polycarboxylic acid superplasticizer.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金(51378196,U1305243)资助项目
【分类号】：TQ172.1

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