A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention is applicable to the technical field of concrete admixtures, and provides a preparation method of a high-efficiency polycarboxylate superplasticizer. According to the invention, the polycarboxylate superplasticizer is prepared by combining epoxypropanol anion ring-opening polymerization with polyether amine; the polycarboxylate superplasticizer has a polyether amine long chain and adendritic polyepoxypropanol long chain at the same time, and has the advantages of low viscosity and large number of end groups, the end groups can form a plurality of contact points with cement particles, and the binding force between the polycarboxylate superplasticizer and cement is effectively increased. The dendritic structure can have large steric hindrance, and the dispersity of cement canbe improved after the dendritic structure is combined with cement particles. The polyether amine long chain can extend into gaps among the cement particles and prevent sulfate ions from invading, so that the binding force between the polycarboxylate superplasticizer and the cement particles is improved. The polycarboxylate superplasticizer prepared by the invention also has the advantages of highwater reducing rate, low mixing amount and good compatibility with cement, and can be used as an admixture for various types of concrete.
本发明适用于混凝土外加剂技术领域，提供了一种高效聚羧酸减水剂的制备方法，本发明通过环氧丙醇阴离子开环聚合结合聚醚胺制备了聚羧酸减水剂，该聚羧酸减水剂同时具有聚醚胺长链和树枝状结构的聚环氧丙醇长链，具有粘度低，端基数量多的优点，这些端基能够与水泥颗粒形成众多接触点，有效增加聚羧酸减水剂与水泥之间的结合力。树枝状结构能够具有较大的空间位阻，与水泥颗粒结合后能够提升水泥的分散性。聚醚胺长链能够延伸到水泥颗粒之间的缝隙中，并阻挡硫酸根离子侵入，提升聚羧酸减水剂与水泥颗粒之间的结合力。本发明制备的聚羧酸减水剂还具有减水率高、掺量低、与水泥相容性好，可作为多种混凝土的外加剂使用。
The invention is applicable to the technical field of concrete admixtures, and provides a preparation method of a high-efficiency polycarboxylate superplasticizer. According to the invention, the polycarboxylate superplasticizer is prepared by combining epoxypropanol anion ring-opening polymerization with polyether amine; the polycarboxylate superplasticizer has a polyether amine long chain and adendritic polyepoxypropanol long chain at the same time, and has the advantages of low viscosity and large number of end groups, the end groups can form a plurality of contact points with cement particles, and the binding force between the polycarboxylate superplasticizer and cement is effectively increased. The dendritic structure can have large steric hindrance, and the dispersity of cement canbe improved after the dendritic structure is combined with cement particles. The polyether amine long chain can extend into gaps among the cement particles and prevent sulfate ions from invading, so that the binding force between the polycarboxylate superplasticizer and the cement particles is improved. The polycarboxylate superplasticizer prepared by the invention also has the advantages of highwater reducing rate, low mixing amount and good compatibility with cement, and can be used as an admixture for various types of concrete.
本发明适用于混凝土外加剂技术领域，提供了一种高效聚羧酸减水剂的制备方法，本发明通过环氧丙醇阴离子开环聚合结合聚醚胺制备了聚羧酸减水剂，该聚羧酸减水剂同时具有聚醚胺长链和树枝状结构的聚环氧丙醇长链，具有粘度低，端基数量多的优点，这些端基能够与水泥颗粒形成众多接触点，有效增加聚羧酸减水剂与水泥之间的结合力。树枝状结构能够具有较大的空间位阻，与水泥颗粒结合后能够提升水泥的分散性。聚醚胺长链能够延伸到水泥颗粒之间的缝隙中，并阻挡硫酸根离子侵入，提升聚羧酸减水剂与水泥颗粒之间的结合力。本发明制备的聚羧酸减水剂还具有减水率高、掺量低、与水泥相容性好，可作为多种混凝土的外加剂使用。
Preparation method of high-efficiency polycarboxylate superplasticizer
一种高效聚羧酸减水剂的制备方法
2020-09-15
Patent
Electronic Resource
Chinese
| European Patent Office | 2023
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| European Patent Office | 2016