A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preparation method of modified polycarboxylate superplasticizer for clay rock concrete
The invention discloses a preparation method of a modified polycarboxylate superplasticizer for clay rock concrete. The preparation method comprises the following steps: (1) preparation of a third monomer intermediate; (2) preparation of a third monomer; and (3) synthesizing of the modified polycarboxylate superplasticizer. The invention provides the preparation method of the modified polycarboxylate superplasticizer for clay rock concrete. Two-step ring opening polymerization is carried out on maleic anhydride serving as an initiator, epoxide and epoxy chloropropane to generate an intermediate with a maleic anhydride structure, amino acid containing a benzene ring or heterocyclic structure is grafted to the tail end of the intermediate to obtain the modified polycarboxylate superplasticizer, a functional third monomer which is terminated by a terminal carboxyl group and has a rigid structure is prepared, and the monomer, acrylic acid and a polycarboxylate superplasticizer polyether macromonomer are subjected to copolymerization so as to obtain the modified PCE with high tolerance to clay in clay rock. Due to the fact that the third monomer is terminated by carboxyl and a benzene ring or a heterocyclic ring exists in the structure, on the basis that the original performance of conventional PCE is kept, the electrostatic repulsion effect and the steric hindrance effect of a side chain of the PCE are improved, the surface and intercalation adsorption effect of clay such as kaolin and montmorillonite on the PCE is reduced, the tolerance of the PCE to the clay is improved, and the negative effect of the clay on the dispersing performance of the PCE is reduced.
本发明公开了一种粘土岩混凝土用改性聚羧酸减水剂的制备方法，包括如下步骤：①第三单体中间体的制备；②第三单体的制备；③改性聚羧酸减水剂的合成。本发明提供一种粘土岩混凝土用改性聚羧酸减水剂的制备方法，以马来酸酐为起始剂与环氧化物、环氧氯丙烷分两步开环聚合生成马来酸酐结构的中间体，再将中间体末端接枝含有苯环或杂环结构的氨基酸，制得端羧基封端且具有刚性结构的功能型第三单体，并采用该单体与丙烯酸、聚羧酸减水剂聚醚大单体共聚制备出对粘土岩中粘土具有高耐受性的改性PCE。由于第三单体羧基封端以及结构中苯环或杂环的存在，在保持常规PCE原有性能的基础上，提升了其侧链的静电斥力作用和空间位阻效应，减小高岭土、蒙脱土等粘土对PCE的表面和插层吸附作用，提高PCE对粘土的耐受性，降低粘土对PCE分散性能的负面作用。
Preparation method of modified polycarboxylate superplasticizer for clay rock concrete
The invention discloses a preparation method of a modified polycarboxylate superplasticizer for clay rock concrete. The preparation method comprises the following steps: (1) preparation of a third monomer intermediate; (2) preparation of a third monomer; and (3) synthesizing of the modified polycarboxylate superplasticizer. The invention provides the preparation method of the modified polycarboxylate superplasticizer for clay rock concrete. Two-step ring opening polymerization is carried out on maleic anhydride serving as an initiator, epoxide and epoxy chloropropane to generate an intermediate with a maleic anhydride structure, amino acid containing a benzene ring or heterocyclic structure is grafted to the tail end of the intermediate to obtain the modified polycarboxylate superplasticizer, a functional third monomer which is terminated by a terminal carboxyl group and has a rigid structure is prepared, and the monomer, acrylic acid and a polycarboxylate superplasticizer polyether macromonomer are subjected to copolymerization so as to obtain the modified PCE with high tolerance to clay in clay rock. Due to the fact that the third monomer is terminated by carboxyl and a benzene ring or a heterocyclic ring exists in the structure, on the basis that the original performance of conventional PCE is kept, the electrostatic repulsion effect and the steric hindrance effect of a side chain of the PCE are improved, the surface and intercalation adsorption effect of clay such as kaolin and montmorillonite on the PCE is reduced, the tolerance of the PCE to the clay is improved, and the negative effect of the clay on the dispersing performance of the PCE is reduced.
本发明公开了一种粘土岩混凝土用改性聚羧酸减水剂的制备方法，包括如下步骤：①第三单体中间体的制备；②第三单体的制备；③改性聚羧酸减水剂的合成。本发明提供一种粘土岩混凝土用改性聚羧酸减水剂的制备方法，以马来酸酐为起始剂与环氧化物、环氧氯丙烷分两步开环聚合生成马来酸酐结构的中间体，再将中间体末端接枝含有苯环或杂环结构的氨基酸，制得端羧基封端且具有刚性结构的功能型第三单体，并采用该单体与丙烯酸、聚羧酸减水剂聚醚大单体共聚制备出对粘土岩中粘土具有高耐受性的改性PCE。由于第三单体羧基封端以及结构中苯环或杂环的存在，在保持常规PCE原有性能的基础上，提升了其侧链的静电斥力作用和空间位阻效应，减小高岭土、蒙脱土等粘土对PCE的表面和插层吸附作用，提高PCE对粘土的耐受性，降低粘土对PCE分散性能的负面作用。
Preparation method of modified polycarboxylate superplasticizer for clay rock concrete
一种粘土岩混凝土用改性聚羧酸减水剂的制备方法
XU SHIRUI (author) / LIU YONG (author) / LI TIANSHU (author) / LI PENG (author) / LIU WEI (author) / ZUO XIAOQING (author) / LI XIAOMEI (author) / ZHANG XUN (author)
2021-06-08
Patent
Electronic Resource
Chinese
IPC:
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
| European Patent Office | 2023
| European Patent Office | 2021
Preparation method of modified polycarboxylate superplasticizer
| European Patent Office | 2024
| European Patent Office | 2023
Preparation method of anti-clay type polycarboxylate superplasticizer
| European Patent Office | 2015