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Preparation method of ether amphoteric polycarboxylic acid water reducing agent

A technology of amphoteric polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, can solve the problems of unsuitable water reducing agent application market, complex synthesis process, and expensive preparation cost, and achieve low cost, simple reaction equipment, and high slump retention sexual effect

Active Publication Date: 2012-08-08
湖南加美乐素新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation cost is expensive and the synthesis process is complicated, so it is not suitable for the current application market of domestic water reducers.

Method used

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  • Preparation method of ether amphoteric polycarboxylic acid water reducing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step: preparation of amidopolyamine

[0028] First, put 98kg of ethanolamine into the reaction kettle, start stirring and heat up, and add a small amount of glacial acetic acid as a dispersion medium and an acidulant. When the temperature reaches 45°C, add 0.66kg of p-toluenesulfonic acid while stirring, and stir evenly; then add maleic anhydride in three batches, 43kg each time, and control the temperature at 80°C during the feeding period; keep the system temperature at Insulate and react at 92°C for 5-7 hours, and stop the reaction when the acid value of the system remains unchanged. This reaction adopts p-toluenesulfonic acid as p-toluenesulfonic acid, glacial acetic acid as dispersion medium and acidifying agent, helps to improve reaction esterification rate and properly suppress amidation reaction, retains more amino groups in a small amount of maleic acid derivatives, will Helps improve the performance of amphoteric polycarboxylates.

[0029] The seco...

Embodiment 2

[0032] The first step: preparation of amidopolyamine

[0033] First, put 98kg of ethanolamine into the reaction kettle, start stirring and heat up, and add a small amount of glacial acetic acid as a dispersion medium and an acidulant. When the temperature reaches 45°C, add 0.66kg of p-toluenesulfonic acid while stirring, and stir evenly; then add maleic anhydride in three batches, 43kg each time, and control the temperature at 80°C during the feeding period; keep the system temperature at Insulate and react at 92°C for 5-7 hours, and stop the reaction when the acid value of the system remains unchanged. This reaction adopts p-toluenesulfonic acid as p-toluenesulfonic acid, glacial acetic acid as dispersion medium and acidifying agent, helps to improve reaction esterification rate and properly suppress amidation reaction, retains more amino groups in a small amount of maleic acid derivatives, will Helps improve the performance of amphoteric polycarboxylates.

[0034] The seco...

Embodiment 3

[0037] The first step: preparation of amidopolyamine

[0038] First, put 98kg of ethanolamine into the reaction kettle, start stirring and heat up, and add a small amount of glacial acetic acid as a dispersion medium and an acidulant. When the temperature reaches 45°C, add 0.66kg of p-toluenesulfonic acid while stirring, and stir evenly; then add maleic anhydride in three batches, 43kg each time, and control the temperature at 80°C during the feeding period; keep the system temperature at Insulate and react at 92°C for 5-7 hours, and stop the reaction when the acid value of the system remains unchanged. This reaction adopts p-toluenesulfonic acid as p-toluenesulfonic acid, glacial acetic acid as dispersion medium and acidifying agent, helps to improve reaction esterification rate and properly suppress amidation reaction, retains more amino groups in a small amount of maleic acid derivatives, will Helps improve the performance of amphoteric polycarboxylates.

[0039] The seco...

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Abstract

The invention discloses a preparation method of an ether amphoteric polycarboxylic acid water reducing agent. According to the preparation method, based on the second-generation polycarboxylic acid water reducing agent, a novel ether amphoteric polycarboxylic acid water reducing agent is prepared by introducing a small number of amide polyamine units into a molecular structure of an ether polycarboxylic acid copolymer through two-step single reaction. Since the adsorption of the water reducing agent on the surfaces of cement particles can be improved by the amide polyamine units to a certain extent, the amide polyamine units have a plastic retaining effect in place of a short side chain; and thus, the slump retaining performance of a polyether water reducing agent is favorably improved, and the water reducing agent prepared by the process has low cost and stable performance to expand the application range of the polyether water reducing agent. The preparation method has the advantagesof simple reaction equipment, easiness for control, low cost and the like; and meanwhile, the prepared polycarboxylic acid water reducing agent has higher water reducing rate, superior workability and higher slump retaining property.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a preparation method of an ether amphoteric polycarboxylate water reducer. Background technique [0002] High performance water reducer is an important material to meet the requirements of high performance concrete. Due to good plasticity and excellent application performance, polycarboxylate high-efficiency water reducers have gradually replaced naphthalene-based water reducers. They have been used in many important projects in my country, such as high-speed railways, bridges, airports, water conservancy and hydropower and other construction projects. Wide range of applications. And these projects have increasingly strong demand for high-performance concrete, which requires high-performance polycarboxylate superplasticizer products with good performance and moderate price. [0003] At present, the requirements for high-performance concrete are not only high strength, but more attention i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F222/06C08F220/06C08F228/02C04B24/16C04B103/30
Inventor 廖声金
Owner 湖南加美乐素新材料股份有限公司
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