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High-efficiency polycarboxylic acid salt water reducer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of concrete admixtures, can solve the problems of poor performance, late polycarboxylate water reducer, and poor stability, and achieve simple process flow, stability, and transmission even heat effect

Inactive Publication Date: 2012-06-20
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on polycarboxylate superplasticizers in my country started relatively late. Although several self-made products have been put into the market, the overall performance is not very good and the stability is poor.

Method used

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  • High-efficiency polycarboxylic acid salt water reducer and preparation method thereof
  • High-efficiency polycarboxylic acid salt water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 3.6g of acrylamide, 7.2g of sodium allyl sulfonate, and 0.1% ammonium persulfate of the total mass of the three monomers of acrylamide, sodium allyl sulfonate, and acrylic acid into a reaction vessel filled with 40g of distilled water, and stir , heating, when the temperature of the system rises to 60°C, add 3.6g of acrylic acid, add 25% NaOH solution to adjust the pH of the reaction system to 3, raise the temperature to 75°C, and react for 4h. Adjust the pH value to 6-7 with 25% NaOH solution, and the obtained light yellow liquid is polycarboxylate superplasticizer, where a= 35, b= 62, c= 120.

Embodiment 2

[0023] Put 3.6g of acrylamide, 7.2g of sodium allyl sulfonate, and 0.1% ammonium persulfate of the total mass of the three monomers of acrylamide, sodium allyl sulfonate, and acrylic acid into a reaction vessel filled with 40g of distilled water, and stir , heating, when the temperature of the reactant reaches 60°C, add 3.6g of acrylic acid, add 25% NaOH solution to adjust the pH of the reaction system to 5, stir and raise the temperature to 75°C, and react for 4h. Adjust the pH value between 6 and 7 with NaOH solution, and the resulting light yellow liquid is polycarboxylate superplasticizer, where a=54, b=58, c=113.

Embodiment 3

[0025] Put 3.6g of acrylamide, 7.2g of sodium allyl sulfonate, and 0.1% ammonium persulfate of the total mass of the three monomers of acrylamide, sodium allyl sulfonate, and acrylic acid into a reaction vessel filled with 40g of distilled water, and stir , heating, when the temperature of the system rises to 60°C, add 3.6g of acrylic acid, add 25% NaOH solution to adjust the pH of the reaction system to 7, raise the temperature to 75°C, and react for 4h. 25% NaOH solution to adjust the pH value to 6-7, and the resulting light yellow liquid is polycarboxylate superplasticizer, where a= 78, b=65, c= 125.

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Abstract

The invention discloses high-efficiency polycarboxylic acid salt water reducer and the preparation method thereof. Under the condition that initiator exists, the high-efficiency polycarboxylic acid salt water reducer is synthesized by taking crylic acid, allyl sodium sulfonate and acrylic amide as raw materials and adopting a radical water solution copolymerization method. The invention has the advantages of low addition amount, high water reducing ratio, excellent slump resistance and easiness, no water bleeding and slurry bleeding phenomenon and the like. When the slump is about 80mm, the water reducing ratio at least can reach 30 percent. Since special functional groups are formed in a molecular structure, the water reducer has the retarding effect and can reduce the flow resistance of cement slurry and prevent the filtration of the cement slurry. The high-efficiency polycarboxylic acid salt water reducer has low raw material cost, simple preparation process and no nitrogen inlet, and is easy for industrial production.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the building is developing in the direction of large-scale and high-rise buildings, and the development of concrete production into high-quality concrete with centralized mixing has become the dominant trend. At present, more than 80% of the water-reducing agents sold in the Chinese market are naphthalene-based water-reducing agents, and the limited raw materials of naphthalene-based water-reducing agents are far below the market demand for the production of concrete water-reducing agents. The main raw material industry naphthalene is lacking. , The price rise has led to an increase in the cost of producing naphthalene-based water reducers, and its price has been increasing year by year in fluctuations, and is no longer cheap. [0003] The per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F228/02C08F220/56C08F220/06C04B103/30
CPCC04B24/2641C04B24/161
Inventor 刘亚青孙友谊蔡苇崔鸿越赵贵哲
Owner ZHONGBEI UNIV