Early-strength polycarboxylic acid water reducing agent

A technology of early-strength polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid high-performance concrete water reducing agent and its preparation, can solve problems such as long setting time, and achieve stable product performance, improved compressive strength, and alkali content. low effect

Inactive Publication Date: 2012-06-20
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The early-strength polycarboxylate water-reducer overcomes the shortcomings of previous water-reducers with complex production process and long setting time, and provides an early-strength polycarboxylate high

Method used

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  • Early-strength polycarboxylic acid water reducing agent
  • Early-strength polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] best ratio

[0024] Add 100.00 parts of polyoxyethylene ether with a molecular weight of 2000 and 100.00 parts of water into the reaction container, raise the temperature, and stir at a temperature of 80±5°C to completely dissolve the reactant, then add dropwise 10.80 parts of acrylic acid+ 4.74 parts of sodium methacryl sulfonate+2.13 parts of acrylamide+40 parts of water, 24.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptoethanol solution with a mass percentage of 10%, control the dropping rate at 100±10 minutes After dropping, keep the temperature at 80±5°C and continue the reaction for 4 hours. After cooling, about 2.53 parts of 40% sodium hydroxide solution was added to adjust the pH to 6.5±0.5 to obtain the polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 2

[0026] Add 100.00 parts of polyoxyethylene ether with a molecular weight of 2000 and 94.57 parts of water into the reaction vessel, raise the temperature, and stir at a temperature of 80±5°C to completely dissolve the reactant, then add dropwise 7.20 parts of acrylic acid+ 4.74 parts of sodium methacryl sulfonate+2.13 parts of acrylamide+40 parts of water, 24.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptoethanol solution with a mass percentage of 10%, control the dropping rate at 100±10 minutes After dropping, keep the temperature at 80±5°C and continue the reaction for 4 hours. After cooling, about 2.53 parts of 40% sodium hydroxide solution was added to adjust the pH to 6.5±0.5 to obtain the polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 3

[0028] Add 100.00 parts of polyoxyethylene ether with a molecular weight of 2000 and 105.38 parts of water into the reaction container, raise the temperature, and stir at a temperature of 80±5°C to completely dissolve the reactant, then add dropwise 14.4 parts of acrylic acid+ 4.74 parts of sodium methacryl sulfonate+2.13 parts of acrylamide+40 parts of water, 24.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptoethanol solution with a mass percentage of 10%, control the dropping rate at 100±10 minutes After dropping, keep the temperature at 80±5°C and continue the reaction for 4 hours. After cooling, about 2.53 parts of 40% sodium hydroxide solution was added to adjust the pH to 6.5±0.5 to obtain the polycarboxylate high-performance concrete water reducer of the present invention.

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Abstract

The invention relates to an early-strength polycarboxylic acid water reducing agent and a preparation method thereof. The early-strength polycarboxylic acid water reducing agent is in a liquid state, and the solid content is 40%. The preparation method comprises the following steps: polymerizing modified polyoxyethylene ether or polyoxypropylene ether, (methyl)acrylic acid or itaconic acid, acrylamide, sodium methyl propenyl sulfonate and other monomers under the actions of a molecular weight chain initiator and a chain transfer agent; and neutralizing to obtain the water reducing agent containing carboxy, amino, sulfonic and polyethenoxy side chains. The early-strength polycarboxylic acid water reducing agent provided by the invention has the advantages of low alkali content and high water reducing rate; and when the early-strength polycarboxylic acid water reducing agent, which accounts for 0.6-1.4 wt of the cementing material, is added to the cementing material, the concrete is labor-saving for operation, and the cement mixture has high flowability and good workability. The early-strength polycarboxylic acid water reducing agent can effectively shorten the setting time and enhance the early strength. The invention has the advantages of simple production technique, easily controlled reaction conditions and no environmental pollution.

Description

technical field [0001] The invention belongs to a polycarboxylate high-performance concrete water reducer and a preparation method thereof. Background technique [0002] Compared with high-efficiency water-reducing agents such as naphthalene-based, melamine-based, and sulfamic acid salts, polycarboxylate-based water-reducers have more excellent performance, and the outstanding performance is low dosage, high water-reducing rate, fresh concrete fluidity and The characteristics of good slump retention, low shrinkage, great strengthening potential, and environmental friendliness have become the direction of development and application in recent years and even in the future. Polycarboxylate high-performance water reducer has become the representative of the latest product of concrete admixture, and its research and application have been highly valued by professional technicians and construction personnel at home and abroad. In recent years, my country has achieved rapid develop...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 杨晓峰熊卫锋
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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