Novel early-strength polycarboxylate superplasticizer

A water-reducing agent and early-strength type technology, which is applied in the field of new-type early-strength polycarboxylate water-reducing agent, can solve problems such as prolonging the setting time of concrete, darkening the appearance of concrete components, and lacking a sense of brightness

Pending Publication Date: 2021-06-18
湖北三可建材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Naphthalene-based water-reducing agents have poor concrete fluidity, rapid slump loss, and easy bleeding, and the appearance of formed concrete components is dark and lacks a sense of brightness; although melamine-based water-reducing agents have significant early strength effects, they are not compatible with The adaptability of cement varieties is not very good, and the concrete slump loss is relatively fast. In addition, there are shortcomings such as strict requirements on reaction conditions and difficult quality control. As the third generation of high-efficiency water reducers, polycarboxylate water reducers High efficiency, obvious reinforcement effect, low slump loss of concrete mixture and other excellent performances have become a hot spot in the research and development of water reducing agents at home and abroad, and have been widely used in prefabricated concrete, but ordinary polycarboxylate Acid water reducer has a certain retarding effect and air-entraining property, which prolongs the setting time of concrete, which is not conducive to the improvement of early strength and the rapid demoulding of prefabricated components

Method used

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  • Novel early-strength polycarboxylate superplasticizer
  • Novel early-strength polycarboxylate superplasticizer

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Experimental program
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Effect test

Embodiment 1

[0015] The preparation method of early-strength polycarboxylate water reducer comprises the following steps:

[0016] 1) First put 50 parts of water and 50 parts of polycarboxylate water reducer into the reaction kettle, stir until dissolved, and heat to 65°C;

[0017] 2) Add 3 parts of glucose, 5 parts of methacrylic acid, and 1 part of mercaptopropionic acid to it at the same time. After 1.8 hours of heat preservation, add alkali to neutralize to pH 6-7, and replenish water until the solid content is 45%. Strong polycarboxylate superplasticizer.

Embodiment 2

[0019] The preparation method of early-strength polycarboxylate water reducer comprises the following steps:

[0020] 1) First, put 70 parts of water and 30 parts of polycarboxylate water reducer into the reaction kettle, stir until dissolved, and heat to 70°C;

[0021] 2) Add 5 parts of glucose, 10 parts of methacrylic acid, and 2 parts of thioglycolic acid to it at the same time. After 1.5 hours of heat preservation, add alkali to neutralize to pH 6-7, and replenish water until the solid content is 46%, and the early-strength type is obtained. Polycarboxylate superplasticizer.

Embodiment 3

[0023] The preparation method of early-strength polycarboxylate water reducer comprises the following steps:

[0024] 1) First put 40 parts of water and 60 parts of polycarboxylate water reducer into the reaction kettle, stir until dissolved, and heat to 85°C;

[0025] 2) Add 2 parts of sodium citrate, 3 parts of methacrylic acid, and 2 parts of mercaptopropionic acid to it at the same time. After keeping warm for 2 hours, add alkali to neutralize the pH to 6-7, and replenish water until the solid content is 42%. Early strength polycarboxylate superplasticizer.

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Abstract

The invention relates to a novel early-strength polycarboxylate superplasticizer. The novel early-strength polycarboxylate superplasticizer comprises a polycarboxylate superplasticizer, a retarder, unsaturated acid, a chain transfer agent and water. A synthesis method for the novel early-strength polycarboxylate superplasticizer is simple in process , easy to operate and high in water-reducing rate, can greatly reduce a water-cement ratio and ensures concrete strength; and the novel early-strength polycarboxylate superplasticizer is low in shrinkage rate, and can effectively improve the durability of concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a novel early-strength polycarboxylate water reducer. Background technique [0002] At present, the water reducers used in my country's prefabricated concrete are mainly naphthalene-based and melamine-based water-reducers. Naphthalene-based water-reducing agents have poor concrete fluidity, rapid slump loss, and easy bleeding, and the appearance of formed concrete components is dark and lacks a sense of brightness; although melamine-based water-reducing agents have significant early strength effects, they are not compatible with The adaptability of cement varieties is not very good, and the concrete slump loss is relatively fast. In addition, there are shortcomings such as strict requirements on reaction conditions and difficult quality control. As the third generation of high-efficiency water reducers, polycarboxylate water reducers High efficiency, obvious reinforc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/06C08F220/06
Inventor 唐耀华王光炎向新姣唐宏伟
Owner 湖北三可建材科技股份有限公司
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