Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Viscosity reduction type polycarboxylate superplasticizer and preparation method thereof
The invention relates to the technical field of concrete, and discloses a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof.The preparation method comprises the steps that unsaturated polyether macromonomers and deionized water are added into a reactor, a stirring pump is started for stirring, a chain initiator and a chain transfer agent serve as a material A, a small monomer unit of unsaturated acid and modified chitosan serve as a material B, and the materials A and B are mixed uniformly; the preparation method comprises the following steps: adding a material A and a material B after an unsaturated polyether macromonomer is dissolved, carrying out heat preservation after the material A and the material B are dropwise added, and adding alkali to adjust the pH value to obtain the viscosity-reducing polycarboxylic acid water reducer, so that a structure with relatively small molecular weight is selected to enable polycarboxylic acid molecules to have relatively good extensibility, and the polycarboxylic acid molecules with short side chains form a water layer film with relatively low thickness in concrete; therefore, more free water is released to reduce the viscosity of the concrete.
本发明涉及混泥土技术领域，且公开了一种降黏型聚羧酸减水剂及制备方法，将不饱和聚醚大单体和去离子水加入反应器中，开启搅拌泵搅拌，以链引发剂、链转移剂为A料，不饱和酸的小单体单元、改性壳聚糖为B料，等待不饱和聚醚大单体溶解后加入A料和B料，A料和B料滴加完成后保温，加入碱调节pH得到降黏型聚羧酸减水剂，选用分子量较小的结构使聚羧酸分子有更好的舒展性，短侧链的聚羧酸分子在混泥土中形成水层膜厚度更低，从而释放更多的自由水降低混泥土粘度。
Viscosity reduction type polycarboxylate superplasticizer and preparation method thereof
The invention relates to the technical field of concrete, and discloses a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof.The preparation method comprises the steps that unsaturated polyether macromonomers and deionized water are added into a reactor, a stirring pump is started for stirring, a chain initiator and a chain transfer agent serve as a material A, a small monomer unit of unsaturated acid and modified chitosan serve as a material B, and the materials A and B are mixed uniformly; the preparation method comprises the following steps: adding a material A and a material B after an unsaturated polyether macromonomer is dissolved, carrying out heat preservation after the material A and the material B are dropwise added, and adding alkali to adjust the pH value to obtain the viscosity-reducing polycarboxylic acid water reducer, so that a structure with relatively small molecular weight is selected to enable polycarboxylic acid molecules to have relatively good extensibility, and the polycarboxylic acid molecules with short side chains form a water layer film with relatively low thickness in concrete; therefore, more free water is released to reduce the viscosity of the concrete.
本发明涉及混泥土技术领域，且公开了一种降黏型聚羧酸减水剂及制备方法，将不饱和聚醚大单体和去离子水加入反应器中，开启搅拌泵搅拌，以链引发剂、链转移剂为A料，不饱和酸的小单体单元、改性壳聚糖为B料，等待不饱和聚醚大单体溶解后加入A料和B料，A料和B料滴加完成后保温，加入碱调节pH得到降黏型聚羧酸减水剂，选用分子量较小的结构使聚羧酸分子有更好的舒展性，短侧链的聚羧酸分子在混泥土中形成水层膜厚度更低，从而释放更多的自由水降低混泥土粘度。
Viscosity reduction type polycarboxylate superplasticizer and preparation method thereof
一种降黏型聚羧酸减水剂及制备方法
LI ZHANSHENG (Autor:in)
14.11.2023
Patent
Elektronische Ressource
Chinesisch
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