Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining

A technology of polycarboxylic acid series and water reducing agent, which is applied in the field of polycarboxylic acid series water reducing agent to achieve the effects of ensuring slump, no slump loss, good dispersibility and water reduction.

Inactive Publication Date: 2015-03-25
河北铁园科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will undoubtedly bring a lot of work and great inconvenience to the on-site staff, which requires the development o

Method used

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  • Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining
  • Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining
  • Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Put 360 g of isopentenol polyoxyethylene ether macromonomer with a molecular weight of 2400 into 180 g of deionized water, stir and dissolve at 60° C., and add 1.40 g of hydrogen peroxide after it is completely dissolved. Dissolve 1.0 g of thioglycolic acid and 0.55 g of vitamin C in 120 g of deionized water, and mix well to obtain liquid A. Mix 33g of acrylic acid, 25g of hydroxyethyl acrylate and 65g of deionized water to obtain liquid B. After adding hydrogen peroxide for 15 minutes, keep the temperature at 60°C, and add liquid A and liquid B dropwise at the same time, wherein liquid A is added dropwise for 2.5 hours, and liquid B is added dropwise for 2 hours. After the dropwise addition, keep the temperature for 1 hour, then lower the temperature to 40°C, add 10g of 40% sodium hydroxide solution by mass fraction, add tap water to adjust the solution concentration to 60%, and obtain the polycarboxylic acid-based water reducer of the present invention.

Embodiment 2

[0033] Put 360g of isopentenol polyoxyethylene ether macromonomer with a molecular weight of 2400 and 5g of sodium methacrylate into 180g of deionized water, stir and dissolve at 60°C, and add 1.40g of hydrogen peroxide after it is completely dissolved. Dissolve 0.5g of mercaptopropionic acid and 0.55g of vitamin C in 120g of deionized water, and mix well to obtain liquid A. Mix 33g of acrylic acid, 35g of hydroxybutyl acrylate and 65g of deionized water to obtain liquid B. After adding the hydrogen peroxide for 15 minutes, keep the temperature at 60°C, and add liquid A and liquid B dropwise at the same time, wherein liquid A is added dropwise for 2 h, and liquid B is added dropwise for 1.5 h. After the dropwise addition, keep the temperature for 1 hour, then lower the temperature to 40°C, add 10g of 40% sodium hydroxide solution by mass fraction, add tap water to adjust the solution concentration to 50%, and obtain the polycarboxylic acid-based water reducer of the present in...

Embodiment 3

[0035] Put 360 g of isopentenol polyoxyethylene ether macromonomer with a molecular weight of 2400 into 200 g of deionized water, stir and dissolve at 60° C., and add 1.60 g of hydrogen peroxide after it is completely dissolved. Dissolve 1.5g of mercaptopropionic acid and 0.55g of vitamin C in 120g of deionized water, and mix well to obtain liquid A. Mix 30g of methacrylic acid, 28g of hydroxypropyl acrylate and 65g of deionized water to obtain liquid B. After adding hydrogen peroxide for 15 minutes, keep the temperature at 60°C, and add liquid A and liquid B dropwise at the same time, wherein liquid A is added dropwise for 2.5 hours, and liquid B is added dropwise for 2 hours. After the dropwise addition, keep the temperature for 1 hour, then lower the temperature to 40°C, add 10g of 40% sodium hydroxide solution by mass fraction, add tap water to adjust the solution concentration to 70%, and obtain the polycarboxylic acid-based water reducer of the present invention.

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Abstract

The invention relates to a polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining. The polycarboxylate-based water reducing agent comprises an isoprene alcohol polyoxyethylene ether macromonomer, unsaturated carboxylic acid or acid anhydride, unsaturated sulfonic acid or other salt monomers, unsaturated carboxylic ester monomers, an oxidizing agent, a reducing agent, a chain transfer agent and sodium hydroxide. The prepared polycarboxylate water reducing agent disclosed by the invention contains a plurality of hydrophilic groups such as carboxyl groups and sulfonic acid groups, so that good dispersibility and water reduction performance can be achieved; and meanwhile, ester-based functional groups with slow release functions are also introduced to ensure that the polycarboxylate-based water reducing agent is gradually hydrolyzed under the condition of cement slurry strong alkali to slowly release carboxylic acid, and thus the initial slump degree of concrete can be ensured, and a phenomenon that the concrete has no slump loss in the later period can also be ensured.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a polycarboxylate water-reducer capable of both water reduction and slump retention. Background technique [0002] Polycarboxylate high-performance water-reducing agent plays an important role in high-performance concrete. It has high water-reducing rate, good dispersion performance, strong slump retention ability, and environmental protection. Therefore, it has attracted much attention from the academic community. The agent has been vigorously promoted in major projects such as railways, highways, bridges, tunnels, hydropower, seaports, airports, docks, and civil projects. [0003] At present, polycarboxylate superplasticizers are developing in two directions: high water reduction and high slump retention. During use, it is necessary to compound the water reducer and slump retention agent to meet the needs of on-site work. Due to the wide variety of cement in our ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F220/28C08F222/06C08F228/02C08F220/14C08F220/58C08F212/14C08F4/40C08F2/38
Inventor 孟祥娣杨晓郭晓磊高勇利白晓卿
Owner 河北铁园科技发展有限公司
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