A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preparation method of salt-resistant reinforced concrete thickening agent
The invention relates to the technical field of additives for concrete, and particularly discloses a preparation method of a salt-resistant reinforced concrete thickener. According to the invention, hydroxypropyl methyl cellulose (HPMC) is used for preparing a thickening functional monomer containing double bonds, the thickening functional monomer is grafted on a polycarboxylate superplasticizer through free radical polymerization, a cross-linking agent is added, so grafted cellulose molecules are cross-linked, and adverse effect on the performance of the thickening agent caused by the agglomeration effect of calcium ions, which is generated by cement hydration, when the cellulose molecules are independently used as the thickening agent is reduced; meanwhile, early strength is improved, and curing time is shortened; and moreover, a functional monomer containing a sulfonic acid group is added as an anti-salt group, and the sulfonic acid group is added in the system, so the hydrophilicity of the thickening agent can be improved, and a repulsive interaction can be generated on external sulfate, thereby enhancing the sulfate erosion resistance of concrete. The invention aims to solve the problems of poor water solubility, long dissolution time and poor compatibility with additives of existing thickening agents.
本申请涉及混凝土用外加剂技术领域，具体公开了一种抗盐增强型混凝土增稠剂的制备方法，使用羟丙基甲基纤维素(HPMC)制备含双键的增稠性功能单体，并通过自由基聚合将其接枝在聚羧酸减水剂上，增加交联剂使接枝上的纤维素分子发生交联，降低纤维素分子单独作为增稠剂时因水泥水化产生的钙离子而发生团聚作用对其性能产生的不良影响；同时提升早期强度，缩短养护时间；另外，增加了含有磺酸基的功能单体作为抗盐基团，在体系中增加磺酸基团，不仅能够提高增稠剂的亲水性，还能对外界硫酸盐产生排斥作用，从而增强混凝土抗硫酸盐侵蚀的能力。本专利的目的在于解决现有增稠剂水溶性差，溶解时间长，同时与外加剂的相容性差的问题。
Preparation method of salt-resistant reinforced concrete thickening agent
The invention relates to the technical field of additives for concrete, and particularly discloses a preparation method of a salt-resistant reinforced concrete thickener. According to the invention, hydroxypropyl methyl cellulose (HPMC) is used for preparing a thickening functional monomer containing double bonds, the thickening functional monomer is grafted on a polycarboxylate superplasticizer through free radical polymerization, a cross-linking agent is added, so grafted cellulose molecules are cross-linked, and adverse effect on the performance of the thickening agent caused by the agglomeration effect of calcium ions, which is generated by cement hydration, when the cellulose molecules are independently used as the thickening agent is reduced; meanwhile, early strength is improved, and curing time is shortened; and moreover, a functional monomer containing a sulfonic acid group is added as an anti-salt group, and the sulfonic acid group is added in the system, so the hydrophilicity of the thickening agent can be improved, and a repulsive interaction can be generated on external sulfate, thereby enhancing the sulfate erosion resistance of concrete. The invention aims to solve the problems of poor water solubility, long dissolution time and poor compatibility with additives of existing thickening agents.
本申请涉及混凝土用外加剂技术领域，具体公开了一种抗盐增强型混凝土增稠剂的制备方法，使用羟丙基甲基纤维素(HPMC)制备含双键的增稠性功能单体，并通过自由基聚合将其接枝在聚羧酸减水剂上，增加交联剂使接枝上的纤维素分子发生交联，降低纤维素分子单独作为增稠剂时因水泥水化产生的钙离子而发生团聚作用对其性能产生的不良影响；同时提升早期强度，缩短养护时间；另外，增加了含有磺酸基的功能单体作为抗盐基团，在体系中增加磺酸基团，不仅能够提高增稠剂的亲水性，还能对外界硫酸盐产生排斥作用，从而增强混凝土抗硫酸盐侵蚀的能力。本专利的目的在于解决现有增稠剂水溶性差，溶解时间长，同时与外加剂的相容性差的问题。
Preparation method of salt-resistant reinforced concrete thickening agent
一种抗盐增强型混凝土增稠剂的制备方法
AO FAN (author) / DENG NI (author) / CHEN JIE (author) / FANG SHICHANG (author) / TIAN YINGBING (author)
2021-12-03
Patent
Electronic Resource
Chinese
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