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酯类小单体对聚羧酸减水剂缓释行为的影响

冯鹏超 张光华 张雪 崔鸿跃 王哲 韩小倩

冯鹏超, 张光华, 张雪, 崔鸿跃, 王哲, 韩小倩. 酯类小单体对聚羧酸减水剂缓释行为的影响[J]. 华南师范大学学报(自然科学版), 2022, 54(2): 37-44. doi: 10.6054/j.jscnun.2022024
引用本文: 冯鹏超, 张光华, 张雪, 崔鸿跃, 王哲, 韩小倩. 酯类小单体对聚羧酸减水剂缓释行为的影响[J]. 华南师范大学学报(自然科学版), 2022, 54(2): 37-44. doi: 10.6054/j.jscnun.2022024
FENG Pengchao, ZHANG Guanghua, ZHANG Xue, CUI Hongyue, WANG Zhe, HAN Xiaoqian. The Effect of Small Ester Monomers on the Slow-release Behavior of Polycarboxylate Superplasticizer[J]. Journal of South China normal University (Natural Science Edition), 2022, 54(2): 37-44. doi: 10.6054/j.jscnun.2022024
Citation: FENG Pengchao, ZHANG Guanghua, ZHANG Xue, CUI Hongyue, WANG Zhe, HAN Xiaoqian. The Effect of Small Ester Monomers on the Slow-release Behavior of Polycarboxylate Superplasticizer[J]. Journal of South China normal University (Natural Science Edition), 2022, 54(2): 37-44. doi: 10.6054/j.jscnun.2022024

酯类小单体对聚羧酸减水剂缓释行为的影响

doi: 10.6054/j.jscnun.2022024
基金项目: 

国家自然科学基金项目 31670596

陕西省重点研发计划项目 2020GY-232

新型聚羧酸盐减水剂的研发项目-企业横向项目 SHX20160305

详细信息
    通讯作者:

    张光华,教授,zhanggh@sust.edu.cn

  • 中图分类号: O631;TU528.042

The Effect of Small Ester Monomers on the Slow-release Behavior of Polycarboxylate Superplasticizer

  • 摘要: 分别以丙烯酸羟乙酯(HEA)、丙烯酸羟丙酯(HPA)、衣康酸二甲酯(DEI)、富马酸二甲酯(DMF)作为功能小单体,丙烯酸和甲基烯丙基聚氧乙烯醚(HPEG)为主要原料,在氧化-还原体系下,成功制备了一系列缓释型聚羧酸减水剂(PCE)。采用红外光谱(FTIR)、核磁共振氢谱(1H NMR)等对目标产物的结构进行了表征。根据水泥净浆的流动性对比结果,确定了合成的减水剂在不同时间所达到的最大流动度,考察了不同酯类单体对聚羧酸减水剂的缓释性及分散保持性能的影响,并测试了水泥浆体的Zeta电位、PCE的吸附行为。结果表明: DEI的缓释效果优于HEA和HPA,水泥浆流动度在2 h内从190 mm达到255 mm,大大延长了减水剂PCE在水泥表面的吸附时间和流动度保持时间,在实际应用中具有良好的参考意义和应用前景。
  • 图  1  含不同酯类单体PCE的合成路线

    Figure  1.  The synthetic route of PCE containing different esters

    图  2  PCE样品的红外光谱

    Figure  2.  The FTIR spectra of PCE samples

    图  3  PCE样品的1H NMR谱

    Figure  3.  The 1H NMR spectra of PCE samples

    图  4  含不同PCE减水剂水泥浆的流动度

    Figure  4.  The fluidity of cement paste containing different PCE plasticizers

    图  5  PCE共聚酯基的水解及其在水泥颗粒上的吸附

    Figure  5.  The hydrolysis of ester group of PCE and its adsorption on cement particle

    图  6  不同PCE减水剂在水泥浆体中的吸附量

    Figure  6.  The adsorption capacity of different PCE plasticizers in cement paste

    图  7  含不同浓度PCE减水剂水泥颗粒的Zeta电位

    Figure  7.  The Zeta potential values of cement particles containing different concentrations of PCE plasticizers

    图  8  减水剂PCE的表面张力

    Figure  8.  The surface tension of PCE plasticizers

    图  9  丙烯酸酯水解率随时间的变化

    Figure  9.  The change of acrylate hydrolysis rate with time

    表  1  PCE中各单体的用量及聚合物多分散性系数(PDI)

    Table  1.   The dosage of each monomer in PCE and the polymer dispersity index(PDI)

    样品 投料比/mol Mn/(g·mol-1) Mw/(g·mol-1) PDI
    PCE-HEA 3.25∶1∶3.35 52 651 81 609 1.55
    PCE-HPA 3.25∶1∶3.43 46 752 76 673 1.64
    PCE-DEI 3.25∶1∶2.67 58 963 105 543 1.79
    PCE-DMF 3.25∶1∶2.34 48 721 74 055 1.52
    注:投料比=c(AA) ∶ c(HPEG) ∶ c(HEA、HPA、DEI或DMF)。
    下载: 导出CSV

    表  3  混凝土坍落度损失随时间的变化

    Table  3.   The changes of concrete slump loss over time

    样品 t=0 min t=60 min t=120 min
    土坍落 扩展度 土坍落 扩展度 土坍落 扩展度
    PCE-HEA 220 560 220 530 190 475
    PCE-HPA 230 585 220 540 185 470
    PCE-DEI 215 510 210 515 200 490
    PCE-DMF 210 495 195 500 190 480
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-22
  • 网络出版日期:  2022-05-12
  • 刊出日期:  2022-04-25

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