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Carboxylate water reducing agent and preparation method thereof

A technology of water reducer and polycarboxylate, applied in the field of high performance polycarboxylate water reducer, can solve the problems of poor slump retention, low water reduction rate of products, complex production process of water reducer, etc., and achieve stable product performance , product adaptability, excellent performance and stable effect

Active Publication Date: 2013-11-20
YUEYANG ORIENTAL YUHONG WATERPROOF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the present invention prepares a new type of high-performance polycarboxylate water-reducer, which overcomes the shortcomings of previous water-reducers, such as complex production process, low product water-reducing rate, and poor slump retention. Excellent and stable agent performance, simple synthesis process, easy control of reaction conditions, easy industrial production, energy saving and environmental protection

Method used

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  • Carboxylate water reducing agent and preparation method thereof
  • Carboxylate water reducing agent and preparation method thereof
  • Carboxylate water reducing agent and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Put 150.00 parts of HPEG with a molecular weight of 2400 and 100 parts of water into a reaction container, raise the temperature, and stir at a temperature of 35±5°C to completely dissolve the reactants, add 1.5 parts of 30% hydrogen peroxide solution, and then drop into the container Solubilize the aqueous solution of 18.00 parts of acrylic acid + 4.94 parts of sodium methacrylate + 40 parts of water and the aqueous solution of 0.45 parts of Vc + 0.45 parts of mercaptopropionic acid + 60 parts of water. After completion, keep the temperature at 35±5°C and continue the reaction for 1 hour. After cooling, about 30% sodium hydroxide solution is added to adjust the pH to 6±1 to obtain the 45% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 2

[0030] Put 150.00 parts of TPEG with a molecular weight of 2400 and 100 parts of water into a reaction container, raise the temperature, and stir at a temperature of 35±5°C to completely dissolve the reactants, add 1.5 parts of 30% hydrogen peroxide solution, and then drop into the container Solubilize the aqueous solution of 13.50 parts of acrylic acid + 5.375 parts of methacrylic acid + 4.94 parts of sodium methacryl sulfonate + 40 parts of water and the aqueous solution of 0.45 parts of Vc + 0.45 parts of mercaptopropionic acid + 60 parts of water, control the dropping speed, respectively Dropping is completed at 3h and 3.5h, keep the temperature at 35±5°C, and continue the reaction for 1 hour. After cooling, about 30% sodium hydroxide solution is added to adjust the pH to 6±1 to obtain the 45% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 3

[0032] Put 150.00 parts of TPEG with a molecular weight of 2400 and 100 parts of water into a reaction container, raise the temperature, and stir at a temperature of 35±5°C to completely dissolve the reactants, add 1.5 parts of 30% hydrogen peroxide solution, and then drop into the container Solubilize the aqueous solution of 13.50 parts of acrylic acid + 4.94 parts of sodium methacryl sulfonate + 40 parts of water and the aqueous solution of 0.45 parts of Vc + 0.45 parts of thioglycolic acid + 60 parts of water, control the dropping speed, and finish dropping in 3 hours and 3.5 hours respectively , keep the temperature at 35±5°C, and continue the reaction for 1 hour. After cooling, about 40% sodium hydroxide solution is added to adjust the pH to 6±1 to obtain the 45% polycarboxylate high-performance concrete water reducer of the present invention.

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Abstract

The invention discloses a polycarboxylate water reducing agent, which is a water reducing agent containing side chains of carboxy, sulfo and polyoxyethylene and prepared from monomers such as allyl polyether, acrylic acid and / or derivatives thereof, sodium methallyl sulfonate and aliphatic mercapto acid through polymerization reaction of free radicals and neutralization under an H2O2-Vc oxidation-reduction initiating system. The polycarboxylate water reducing agent is low in alkali content, high in water reducing rate and labor-saving in concrete operation; a cement mixture has high flowability, high slump loss resistance and good workability; and the polycarboxylate water reducing agent serving as an important component of high-performance concrete can be widely applied to premixed and cast-in-place concrete of various industrial and civil buildings, and particularly, has excellent performance in high-strength concrete.

Description

technical field [0001] The invention relates to a novel high-performance polycarboxylate water reducer, which belongs to the field of chemical materials for building construction. 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. Its research and application have been highly valued by professional technicians and construction personnel at home and abroad. In recent years, our country has achieved rapid development in the research and application of polycarboxylate high-performance water reducer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 杨晓峰熊卫锋段文锋
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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