A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Slump-retaining polycarboxylate superplasticizer with high steric hindrance effect and preparation method of slump-retaining polycarboxylate superplasticizer
The invention provides a slump-retaining polycarboxylate superplasticizer with a high steric hindrance effect and a preparation method thereof. The slump-retaining polycarboxylate superplasticizer is prepared from the following raw materials: an isopentenyl polyethylene glycol ether (TPEG) monomer A, an unsaturated acid monomer B, a benzene ring-containing micromolecular intermediate monomer C, a chain transfer agent, an initiator, a reducing agent, liquid caustic soda and water. Compared with the prior art, the water reducing agent provided by the invention contains two carboxyl groups and two larger benzene rings in the early stage of concrete, so that a higher steric hindrance effect is provided for the concrete, the water reducing agent has a higher water reducing rate in the early stage along with the prolonging of time, and ester groups are subjected to hydrolysis reaction under an alkaline condition; two carboxyl groups are added on a main chain of the polycarboxylate superplasticizer, the polycarboxylate superplasticizer shows electronegativity on the surfaces of cement particles, and due to the electrostatic repulsion effect, the concrete can still keep good fluidity, so that the concrete can keep the fluidity for a long time in actual production.
本发明提供了一种具有高空间位阻效应的保坍型聚羧酸减水剂及其制备方法，原料为异戊烯基聚乙二醇醚(TPEG)单体A、不饱和酸单体B、含苯环的小分子中间体单体C、链转移剂、引发剂、还原剂、液碱和水。与现有技术相比，本发明减水剂在混凝土前期由于含有两个羧基以及两个较大的苯环，为其提供了一个较高的空间位阻效应，使得前期其具有较高的减水率随着时间的延长，在碱性条件下酯基发生水解反应，聚羧酸减水剂主链上增加了两个羧基，其在水泥颗粒表面表现出负电性，由于静电斥力作用，混凝土仍然可以保持较好的流动性，这样在实际生产中混凝土能够保持较长时间的流动性。
Slump-retaining polycarboxylate superplasticizer with high steric hindrance effect and preparation method of slump-retaining polycarboxylate superplasticizer
The invention provides a slump-retaining polycarboxylate superplasticizer with a high steric hindrance effect and a preparation method thereof. The slump-retaining polycarboxylate superplasticizer is prepared from the following raw materials: an isopentenyl polyethylene glycol ether (TPEG) monomer A, an unsaturated acid monomer B, a benzene ring-containing micromolecular intermediate monomer C, a chain transfer agent, an initiator, a reducing agent, liquid caustic soda and water. Compared with the prior art, the water reducing agent provided by the invention contains two carboxyl groups and two larger benzene rings in the early stage of concrete, so that a higher steric hindrance effect is provided for the concrete, the water reducing agent has a higher water reducing rate in the early stage along with the prolonging of time, and ester groups are subjected to hydrolysis reaction under an alkaline condition; two carboxyl groups are added on a main chain of the polycarboxylate superplasticizer, the polycarboxylate superplasticizer shows electronegativity on the surfaces of cement particles, and due to the electrostatic repulsion effect, the concrete can still keep good fluidity, so that the concrete can keep the fluidity for a long time in actual production.
本发明提供了一种具有高空间位阻效应的保坍型聚羧酸减水剂及其制备方法，原料为异戊烯基聚乙二醇醚(TPEG)单体A、不饱和酸单体B、含苯环的小分子中间体单体C、链转移剂、引发剂、还原剂、液碱和水。与现有技术相比，本发明减水剂在混凝土前期由于含有两个羧基以及两个较大的苯环，为其提供了一个较高的空间位阻效应，使得前期其具有较高的减水率随着时间的延长，在碱性条件下酯基发生水解反应，聚羧酸减水剂主链上增加了两个羧基，其在水泥颗粒表面表现出负电性，由于静电斥力作用，混凝土仍然可以保持较好的流动性，这样在实际生产中混凝土能够保持较长时间的流动性。
Slump-retaining polycarboxylate superplasticizer with high steric hindrance effect and preparation method of slump-retaining polycarboxylate superplasticizer
一种具有高空间位阻效应的保坍型聚羧酸减水剂及其制备方法
ZHU XUERUI (author) / CHEN FENG (author) / WANG YU (author) / JIANG DACHAO (author) / QIAN SHANSHAN (author) / SONG NANJING (author) / SI HONGZHEN (author) / HUANG WEIXING (author) / WEN LIXIN (author) / WANG HAIXING (author)
2023-11-17
Patent
Electronic Resource
Chinese
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