| 梳形支化结构聚羧酸高性能减水剂的合成 |
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| 引用本文： | 杨勇,冉千平,刘加平,张志勇,缪昌文.梳形支化结构聚羧酸高性能减水剂的合成[J].新型建筑材料,2011(7). |
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| 作者姓名： | 杨勇 冉千平 刘加平 张志勇 缪昌文 |
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| 作者单位： | 江苏博特新材料有限公司,高性能土木工程材料国家重点实验室,江苏省建筑科学研究院有限公司,江苏,南京,210008 |
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| 基金项目： | 江苏省自然科学基金项目 |
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| 摘 要： | 以支化活性大单体与丙烯酸进行水溶液自由基共聚,合成了梳形支化结构聚V酸高性能减水剂.考察了引发体系、单体投料比及滴加时间、链转移剂种类及用量、聚合浓度等合成条件对减水剂分散性能的影响.确定了最佳合成条件为:采用L-抗坏血酸与双氧水的氧化还原引发体系,L-抗坏血酸的用量为1%;内烯酸(AA)与大单体的投料摩尔比为4:1,AA的滴加时间为3 h;链转移剂用量为单体总摩尔数的2.0%;聚合浓度为50%.通过凝胶渗透色谱测得合成减水剂的重均分子质量为47 500,DAM大单体的转化率为89.6%.与常规结构聚羧酸减水剂相比,所制备的梳形支化结构聚羧酸减水剂具有较高的减水率和较好的坍落度保持能力.
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| 关 键 词： | 聚V酸减水剂 支化 大单体 共聚 |
Synthesis of comb-branched polycarboxylate superplasticizers |
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| YANG Yong,RAN Qianping,LIU Jiaping,ZHANG Zhiyong,MIAO Changwen.Synthesis of comb-branched polycarboxylate superplasticizers[J].New Building Materials,2011(7). |
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| Authors: | YANG Yong RAN Qianping LIU Jiaping ZHANG Zhiyong MIAO Changwen |
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| Affiliation: | YANG Yong,RAN Qianping,LIU Jiaping,ZHANG Zhiyong,MIAO Changwen (Jiangsu Bote New Materials Co.Ltd.,State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.Ltd.,Nanjing 210008,Jiangsu,China) |
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| Abstract: | The polycarboxylate superplasticizers were synthesized by the free radical copolymerization of dendritic activated macromonomers and acrylic acid in water.The effects of various synthesis conditions(initiation system,monomer feed ratio and dropping time,type and amount of chain transfer agents,and polymer concentration) on the dispersibility of polycarboxylate superplasticizers were studied.The optimal reaction conditions were using the L-ascorbic acid and Hydrogen Peroxide(H2O2) as initiators,the dosages o... |
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| Keywords: | polycarboxylate superplasticizers branched macromonomer copolymerization |
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