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Universal polycarboxylic acid water reducing agent and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid high-performance water reducing agent and its preparation, can solve the problems of poor slump retention and complex production process of water reducing agent, and achieve stable product performance and easy reaction conditions The effect of control and constant reaction temperature

Active Publication Date: 2015-06-03
YUEYANG ORIENTAL YUHONG WATERPROOF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to meet the needs of the prior art, the present invention discloses a general-purpose polycarboxylate water-reducer. The general-purpose polycarboxylate water-reducer overcomes the complex production process of the previous water-reducer, poor slump retention or high cost. Disadvantages, excellent and stable performance, simple preparation method, easy control of reaction conditions, easy industrial production

Method used

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  • Universal polycarboxylic acid water reducing agent and preparation method thereof
  • Universal polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: optimal proportioning ratio

[0020] Put 100.00 parts of allyl polyether with a molecular weight of 2000, 15 parts of maleic anhydride and some water into a reaction container, raise the temperature, stir at a temperature of 70±5°C to completely dissolve the reactants, and then drop into the container 10.80 parts of acrylic acid, 4.74 parts of sodium methacrylic sulfonate, 2.13 parts of methyl acrylate and 40 parts of deionized water are solubilized with 24.00 parts of 5% ammonium persulfate solution and 10.00 parts of a 10% solution by mass. Ethanol, control the dropping speed, finish dropping in 100±10 minutes, keep the temperature at 70±5°C, and continue the reaction for 4 hours. After cooling, 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

[0022] Put 100.00 parts of polyoxyethylene ether with a molecular weight of 2000, 15 parts of maleic anhydride and 100.00 parts of water into a reaction container, raise the temperature, stir at a temperature of 70±5°C to completely dissolve the reactants, and then drop into the container 10.80 parts of acrylic acid, 4.74 parts of sodium methacrylic sulfonate, 2.13 parts of methyl acrylate and 52 parts of deionized water were solubilized with 12.00 parts of 5% ammonium persulfate solution and 10.00 parts of 10% by mass solution sulfhydryl Ethanol, control the dropping speed, finish dropping in 100±10 minutes, keep the temperature at 70±5°C, and continue the reaction for 4 hours. After cooling, 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

[0024] Put 100.00 parts of polyoxyethylene ether with a molecular weight of 2000, 15 parts of maleic anhydride and 100.00 parts of water into a reaction container, raise the temperature, stir at a temperature of 80±5°C to completely dissolve the reactants, and then drop into the container 10.80 parts of acrylic acid, 4.74 parts of sodium methacrylic sulfonate, 2.13 parts of methyl acrylate and 47 parts of deionized water are solubilized with 12.00 parts of 5% ammonium persulfate solution and 15.00 parts of 10% by mass solution sulfhydryl Ethanol, control the dropping speed, finish dropping in 100±10 minutes, keep the temperature at 80±5°C, and continue the reaction for 4 hours. After cooling, 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 a universal polycarboxylic acid water reducing agent and a preparation method thereof. The universal polycarboxylic acid water reducing agent is of a liquid state and has the solid content of 40%. The universal polycarboxylic acid water reducing agent is the water reducing agent which is prepared from monomers such as allyl polyether, and maleic anhydride, (meth)acrylic acid or itaconic acid, methyl acrylate and sodium methallyl sulfonate through polymerization under the effects of a molecular weight chain initiator and a chain transfer agent and neutralization; and the water reducing agent contains carboxyl, sulfonic group and an allyl polyether side chain. The universal polycarboxylic acid water reducing agent disclosed by the invention is low in alkali content, high in water-reducing rate, labor-saving in concrete operation, simple in production process, easy in reaction condition control and free of environmental pollution; the cement mixture has high mobility and slump keeping property, and good peaceability; and the universal polycarboxylic acid water reducing agent disclosed by the invention can be used as an important component of high-performance concrete, and can be widely applied to stirred and cast-in-place concrete and ready-mixed concrete for various industrial and civil buildings.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a polycarboxylate high-performance 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 Good slump retention, low shrinkage, great reinforcement potential, and environmental friendliness. Therefore, polycarboxylate high-performance water reducer has become the representative of the latest product of concrete admixture. Its research and application have been well received by professional technicians and construction personnel at home and abroad. of great importance. [0003] In recent years, the research, development, production and application of domestic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F22/10C04B103/30
Inventor 杨晓峰熊卫锋
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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