聚丙烯酸高效减水剂的制备及其研究-《混凝土与水泥制品》杂志社

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聚丙烯酸高效减水剂的制备及其研究

Preparation and Research of Polyacrylic Superplasticizer

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关键词：

聚丙烯酸减水剂；工艺优化；坍落度

Key words：

Polyacrylic superplasticizer; Process optimization; Slump

刊期：

２０13年第9期

DOI：

文章编号：

1000-4637（2013）09-17-05

基金项目：

作者：

熊珂，左跃

单位：

江西省建筑材料工业科学研究设计院，南昌 330001

摘要

摘要：根据分子设计的原则，采用“滴加法”合成出一种带长侧链聚醚基团、羧酸基团的聚丙烯酸高效减水剂。通过正交试验和单因素优化，得到最佳工艺条件n(OXAC):n(AA) =0.046:0.175，H2O2的用量为单体总质量的1.2%，VC的用量为H2O2用量的26.9%，在60℃下反应5.0h。当聚丙烯酸高效减水剂的掺量为0.92%时，C40混凝土的初始坍落度为217mm，1h后塌落度为195 mm，含气量为3.5%，28d的强度高达65.4MPa。

Abstract: Based on the principle of molecular design, a polyacrylic superplasticizer is synthesized with long side-chain polyether group and carboxylic group by the method of “titration”. The best reactant ratio are n(OXAC):n(AA) =0.046:0.175 and m(H2O2)= 1.2% [m(OXAC) +m(AA)], m(VC)= 26.9%[m(H2O2)], and the optimal reaction conditions are 60℃ for 5.0h, which is obtained via orthogonal test and single factor optimized. The initial slump of C40 concrete containing the 0.92% superplasticizer is 217mm and remains 195mm after 1h. The air content of the concrete is 3.5%, and its strength reaches up to 65.4MPa at 28d.

结论

（1）以国内易得且价格便宜的异丁烯醇代替主要靠国外进口且价格昂贵的异丙烯醇为合成亲水长侧链的单体原料。

（2）通过正交试验和单因素优化试验得到聚丙烯酸高效减水剂的最佳工艺为n(OXAC):n(AA)=0.046:0.175，H2O2的用量为单体总质量的1.2%，VC的用量为H2O2用量的26.9%，在60℃下反应5.0h。各单体对混凝土坍落度的影响大小次序依次为H2O2＞AA＞OXAC。

（3）当聚丙烯酸高效减水剂的掺量为0.92%时，C40混凝土的初始坍落度为217mm，1h后坍落度为195mm，含气量为3.5%，28d的强度高达65.4MPa，性能略优于奥克公司生产的OXAB和格雷公司生产的ADVA两种减水剂。

参考文献

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