| 梳形聚羧酸系减水剂的制备、表征及其作用机理 |
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| 引用本文： | 李崇智,冯乃谦,王栋民,侯云芬.梳形聚羧酸系减水剂的制备、表征及其作用机理[J].硅酸盐学报,2005,33(1):87-92. |
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| 作者姓名： | 李崇智 冯乃谦 王栋民 侯云芬 |
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| 作者单位： | 北京建筑工程学院土木工程系,北京,100044;清华大学土木水利学院,北京,100084;中国矿业大学,北京,100083 |
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| 摘 要： | 聚羧酸系减水剂具有高减水率和控制混凝土坍落度损失等优点，研究开发新型聚羧酸系减水剂受到广泛关注。以甲基丙烯磺酸钠、2-丙烯酰胺-2甲基丙磺酸、丙烯酸、不同聚氧化乙烯基(polyoxyethlene group，PEO)链长的聚乙二醇丙烯酸酯等单体制备了改进聚羧酸系减水剂(modified polycarboxylic water-reducers，MPC)。表征了MPC的分子结构与性能，讨论了MPC的分散稳定机理。研究表明：MPC具有梳形分子结构，应用MPC后混凝土的减水率能达到25％以上，其分散性与分散保持性能与减水剂的PEO侧链长短有关，其主要通过立体位阻起作用。
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| 关 键 词： | 聚羧酸系减水剂 梳形分子结构 分散与流动保持性能 |
| 文章编号： | 0454-5648(2005)01-0087-06 |
| 修稿时间： | 2004年2月16日 |
PREPARATION AND CHARACTERIZATION OF COMB-LIKE POLYCARBOXYLIC WATER-REDUCERS AND ITS FUNCTION MECHANISM |
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| LI Chongzhi.PREPARATION AND CHARACTERIZATION OF COMB-LIKE POLYCARBOXYLIC WATER-REDUCERS AND ITS FUNCTION MECHANISM[J].Journal of The Chinese Ceramic Society,2005,33(1):87-92. |
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| Authors: | LI Chongzhi |
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| Affiliation: | LI Chongzhi~ |
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| Abstract: | The research and development for polycarboxylic acid type water-reducers were attracted much attention because of their excellent ability of water-reducing and preventing the slump loss of concrete. Modified polycarboxylic water-reducers (MPC) were copolymerized from sodium methallyl sulfonate, acrylic acid, 2acrylamido2methyl propane sulfonic acid, polyethylene glycol mono-acrylates with different length of polyoxyethlene group(PEO)chains. Molecular structures and properties of the polycarboxylic acid type water-reducers were characterized, and the mechanism of their dispersing and stablizing action were also discussed. Results indicate that the water reducing ratio for the MPC with comb-like molecular structure are obtained over 25% and the high dispersing and flowing retention property are mainly affected by the length of side chains of PEO through steric repulsive force. |
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| Keywords: | polycarboxylate-type water-reducers comb-like molecular structure dispersing and flowing retention ability |
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