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用麦芽糊精制备聚羧酸系减水剂
作者:吴井志   高南箫 吕志锋     冉千平 
单位:江苏苏博特新材料股份有限公司 高性能土木工程材料国家重点实验室 南京 211103 
关键词:麦芽糊精 醚化 羧基化 流变 减水剂 
分类号:TU528
出版年,卷(期):页码:2017,45(11):0-0
DOI:10.14062/j.issn.0454-5648.2017.11.14
摘要:
以麦芽糊精为原料,经过醚化改性和羧基化改性后,制备了一种聚羧酸系减水剂(PCWR)。通过红外光谱、核磁共
振、X 射线衍射和扫描电镜测试表征了其分子结构和形态,证明PCWR 已成功引入羟丙基基团和羧基基团。测定了PCWR
的取代度、吸附性能、水泥浆体流变行为以及水泥净浆和混凝土性能,并在此基础上分析了其增稠和减水的作用机理。结果
表明:PCWR 的醚化取代度越大,增稠效果越好,而酯化取代度越大,其在水泥颗粒表面的吸附量越大,对水泥浆体的分散
性越好;与普通萘系减水剂相比,PCWR 的减水效果更好,并且能更好地改善混凝土状态。

 A polycarboxylate superplasticizer water-reducing agent (PCWR) was prepared via etherification and carboxylation with

maltodextrin as a raw material. The molecular structure and morphology were characterized by Fourier transform infrared
spectroscopy (IR), nuclear magnetic resonance (NMR), X-ray diffraction (XRD) and scanning electron microscopy (SEM),
respectively. The degree of substitution (Ds) of PCWR, adsorption performance, rheological behavior of cement paste, cement paste
and concrete performance were measured, and the corresponding mechanism was analyzed. The results show that a greater DS of
etherification has a better thickening effect. The carboxyl groups in PCWR molecules increases the adsorption amount of the
compound, hence enhancing the dispersive performance. Compared to naphthalene superplasticizer, PCWR has a prominent effect on
the increase of water-reducing and the improvement of the state of concrete.
基金项目:
国家自然科学基金(51408271;51508243);国家重点研发计 划(2017YFB0310102)资助项目
作者简介:
吴井志(1986—),男,硕士,工程师
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