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Method for synthesizing universal polycarboxylic water reducer

A type of polycarboxylic acid and water reducing agent technology, applied in the field of polycarboxylic acid high-performance concrete water reducing agent and its preparation, can solve the problems of low water reduction rate and poor slump retention, and achieve improved carbonization resistance and frost resistance. The effect of improving fusion ability and compressive strength

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 general-purpose polycarboxylate water-reducer overcomes the shortcomings of previous water-reducers such as complex production process, low water-reducing rate or poor slump retention, and provides a general-purpose polycarboxylate high-performance concrete water-reducer and its preparation method. The performance of the agent is high and stable, the synthesis process is simple, the reaction conditions are easy to control, and the industrial production is easy

Method used

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  • Method for synthesizing universal polycarboxylic water reducer
  • Method for synthesizing universal polycarboxylic water reducer
  • Method for synthesizing universal polycarboxylic water reducer

Examples

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Embodiment 1

[0017] best ratio

[0018] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 97.05 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 14.4 parts of acrylic acid dissolved in the container dropwise + 6.3 parts of sodium methacryl sulfonate + 40 parts of aqueous solution of water and 60.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptopropionic acid in a solution of 10% by mass, control the rate of addition, and drop it in 100 ± 10 minutes , keep the temperature at 65±5°C, and continue the reaction for 4 hours. After cooling, add about 4 parts of 40% sodium hydroxide solution to adjust the pH=6.5±0.5 to obtain the 40% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 2

[0020] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 81.85 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 3.6 parts of acrylic acid dissolved in the container dropwise + 6.3 parts of sodium methacryl sulfonate + 40 parts of aqueous solution of water and 60.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptopropionic acid in a solution of 10% by mass, control the rate of addition, and drop it in 100 ± 10 minutes , keep the temperature at 65±5°C, and continue the reaction for 4 hours. After cooling, add about 4 parts of 40% sodium hydroxide solution to adjust the pH=6.5±0.5 to obtain the 40% polycarboxylate high-performance concrete water reducer of the present invention.

Embodiment 3

[0022] Put 120.00 parts of polyoxyethylene ether with a molecular weight of 2400 and 102.45 parts of water into a reaction container, raise the temperature, and stir at a temperature of 65±5°C to completely dissolve the reactants, then add 18 parts of acrylic acid dissolved in the container dropwise + 6.3 parts of sodium methacryl sulfonate + 40 parts of aqueous solution of water and 60.00 parts of 5% ammonium persulfate solution and 10.00 parts of mercaptopropionic acid in a solution of 10% by mass, control the rate of addition, and drop it in 100 ± 10 minutes , keep the temperature at 65±5°C, and continue the reaction for 4 hours. After cooling, add about 4 parts of 40% sodium hydroxide solution to adjust the pH=6.5±0.5 to obtain the 40% polycarboxylate high-performance concrete water reducer of the present invention.

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Abstract

The invention relates to universal polycarboxylic water reducer and preparation method thereof. The universal polycarboxylic water reducer is in liquid state, and the solid content of the universal polycarboxylic water reducer is 40%. The universal polycarboxylic water reducer containing carboxyl, sulfonyl and polyoxyethylene side chains is prepared by aggregation of modified polyoxyethylene ether or polyoxypropylene ether with (methyl) acrylic acid or itaconic acid, sodium methylallyl sulfonate and the like under the action of chain initiator and chain transfer agent. The universal polycarboxylic water reducer prepared by the method is low in alkali content and high in water reducing rate. When the universal polycarboxylic water reducer is added into concrete by the cementing material weight ratio of 0.25-10%, operation of the concrete is laborsaving, and cement mixture has high liquidity, falling protection capacity and workability. The universal polycarboxylic water reducer and the preparation method thereof are simple in process, easy to control and free of environment pollution. The polycarboxylic water reducer which is used as an important component of high-performance concrete is widely applicable to pre-mixed and cast-in-situ concrete for various industrial and civil buildings, and especially has excellent performance in high-strength concrete.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C04B103/30
Inventor 杨晓峰熊卫锋
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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