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Slow-release type polycarboxylic acid water reducer and preparation method thereof

A slow-release polycarboxylic acid and water-reducing agent technology, which is applied in the field of building material admixtures, can solve problems such as increased costs, accidents, and cumbersome reaction processes, and achieve good slump-preserving performance, lower production costs, and good slow-release effects Effect

Active Publication Date: 2015-04-01
ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous improvement of the construction level, the requirements for concrete quality are getting higher and higher. In the ready-mixed concrete industry, the problem of slump loss of freshly mixed concrete has always been a problem that plagues construction, especially the long-term transportation will cause concrete Excessive slump loss will affect the working performance of concrete, and adding water to reshape will make the strength and impermeability of the actual concrete fail to meet the index requirements. These measures are cumbersome to operate, increase the cost and easily lead to accidents.
[0003] Chinese patent (CN103723945A) discloses a fast hydrolysis slow-release polycarboxylate water reducer and its preparation method, through polyether, double bond-containing carboxylic acid monomer and water-soluble micro-crosslinking functional additives, in the initiator With the participation of the chain transfer agent, the polymerization reaction, the water reducer can reduce the risk of concrete segregation, etc., but the reaction process of this method is cumbersome, the reaction temperature is high, and the slump performance is not ideal. Polycarboxylate superplasticizers that can be synthesized and can produce delayed dispersion on concrete within a certain period of time and have high slump performance are of great significance

Method used

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  • Slow-release type polycarboxylic acid water reducer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A slow-release polycarboxylate water reducer is formed by free radical polymerization of the following raw materials in parts by weight:

[0025] Primer: isopentenol polyoxyethylene ether: 330, 30%H 2 o 2 : 2.5, deionized water: 210;

[0026] Solution A: AA: 30, MAA: 5, gluconolactone: 8, deionized water: 120;

[0027] Solution B: VC: 0.7, mercaptopropionic acid: 1.2, deionized water: 150.

[0028] A preparation method of slow-release polycarboxylate superplasticizer: at room temperature, add solution A dropwise to the bottom liquid for 3 hours, and simultaneously add solution B dropwise to the bottom liquid for 3.5 hours After the dropwise addition, carry out the copolymerization reaction for 30 minutes, then add an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to 6, and continue stirring for 20 minutes to obtain the slow-release polycarboxylate superplasticizer.

Embodiment 2

[0030] A slow-release polycarboxylate water reducer is formed by free radical polymerization of the following raw materials in parts by weight:

[0031] Primer: isopentenol polyoxyethylene ether: 345, 30%H 2 o 2 : 3.1, deionized water: 235;

[0032] Solution A: AA: 34, MAA: 6.5, gluconolactone: 8, deionized water: 130;

[0033] Solution B: VC: 0.85, mercaptopropionic acid: 1.6, deionized water: 170.

[0034] A preparation method of slow-release polycarboxylate superplasticizer: at room temperature, add solution A dropwise to the bottom liquid for 3 hours, and simultaneously add solution B dropwise to the bottom liquid for 3.5 hours After the dropwise addition, carry out the copolymerization reaction for 30 minutes, then add an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to about 7, and continue stirring for 20 minutes to obtain the slow-release polycarboxylate superplasticizer.

Embodiment 3

[0036] A slow-release polycarboxylate water reducer is formed by free radical polymerization of the following raw materials in parts by weight:

[0037] Primer: isopentenol polyoxyethylene ether: 360, 30%H 2 o 2 : 3.8, deionized water: 250;

[0038] Solution A: AA: 40, MAA: 8.2 Gluconolactone: 8 Deionized water: 142;

[0039] Solution B: VC: 0.9, mercaptopropionic acid: 1.75, deionized water: 195.

[0040] A preparation method of slow-release polycarboxylate superplasticizer: at room temperature, add solution A dropwise to the bottom liquid for 3 hours, and simultaneously add solution B dropwise to the bottom liquid for 3.5 hours After the dropwise addition, carry out the copolymerization reaction for 30 minutes, then add an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to 6, and continue stirring for 20 minutes to obtain the slow-release polycarboxylate superplasticizer.

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Abstract

The invention relates to the technical field of building material additives and in particular relates to a slow-release type polycarboxylic acid water reducer and a preparation method of the slow-release type polycarboxylic acid water reducer. The method comprises the following steps: on the basis of taking unsaturated polyether isoamyl alcohol polyoxyethylene ether, crylic acid, methacrylic acid and glucolactone as monomers, carrying out polymerization reaction at the room temperature in the presence of an initiator, a chain transfer agent and a reduction agent, and neutralizing a reaction system until the pH is 6-7 by using caustic soda liquid after the reaction is ended to prepare the slow-release type polycarboxylic acid water reducer. The water reducer synthesized by gluconolactone has high slump-retaining performance and has the effect of slowly releasing; the concrete state has high mobility; the completion of pumping construction in summer can be facilitated; meanwhile, the preparation process is simple, low in energy consumption and high in economic benefit.

Description

technical field [0001] The invention relates to the technical field of building material admixtures, in particular to a slow-release polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the development of the construction industry, the requirements for water reducing agents in engineering applications are gradually increasing. Polycarboxylate superplasticizer has been greatly promoted and applied because of its high water reducing rate and good adaptability. With the continuous improvement of the construction level, the requirements for concrete quality are getting higher and higher. In the ready-mixed concrete industry, the problem of slump loss of freshly mixed concrete has always been a problem that plagues construction, especially the long-term transportation will cause concrete Excessive slump loss will affect the working performance of concrete, and adding water to reshape will make the strength and impermeability of the a...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F4/40C08F2/38C04B24/26C04B103/30
Inventor 王浩雨马丽涛刘记伟陈琳
Owner ANHUI XIN SOLID ENVIRONMENTAL CO LTD