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Preparation method for synthesizing high-performance polycarboxylic acid water reducing agent by undergoing one-step amidation reaction

The technology of amidation reaction and polycarboxylic acid is applied in the specific preparation field of synthesizing polycarboxylic acid high-performance water-reducing agent by one-step amidation reaction, which can solve the problems of poor dispersibility maintenance and the like, and achieves safe and environmentally friendly preparation process and reduces Production cost, sufficient mixing effect

Inactive Publication Date: 2011-09-14
BEIJING UNIV OF TECH
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Problems solved by technology

The method also adjusts the number of carboxyl groups on the main chain and ethylene oxide repeating units on the side chain during the synthesis process, which effectively improves the problem of poor dispersion retention commonly found in traditional polycarboxylate water reducers, and enriches the synthetic polycarboxylates. Preparation method of carboxylic acid high-performance water reducer

Method used

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  • Preparation method for synthesizing high-performance polycarboxylic acid water reducing agent by undergoing one-step amidation reaction
  • Preparation method for synthesizing high-performance polycarboxylic acid water reducing agent by undergoing one-step amidation reaction
  • Preparation method for synthesizing high-performance polycarboxylic acid water reducing agent by undergoing one-step amidation reaction

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Experimental program
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Effect test

Embodiment 1

[0020] The aqueous solution of 18.62g polyacrylic acid (concentration 58%) is joined in the reactor, vacuumizes and removes the moisture in the system at 35 ℃, then successively adds 100g amino-terminated polyoxyethylene ethers (molecular weight is 2000) in the reactor, 10g of p-toluenesulfonic acid, add 22.16g of cyclohexane when the temperature rises to 80°C, continue to heat up to 145°C for amidation reaction, separate the water obtained during the reaction, and remove it by vacuuming after 6 hours of reaction Cyclohexane, when the temperature is lowered to 40°C, use 12g of 30% sodium hydroxide solution to neutralize to a pH value of 7, cool to 30°C to obtain the reaction product polyacryloyl polyoxyethylene ether amine, and finally add 281.87g of water Diluted to obtain a concentration of 30% polycarboxylate water reducer.

Embodiment 2

[0022] The polycarboxylate superplasticizer with a concentration of 30% obtained in Example 1 was stored at 5° C. for 20 days, and its implementation effect was measured.

Embodiment 3

[0024] An aqueous solution of 26.33g polymethacrylic acid (concentration 49%) was added in the reactor, and the moisture in the system was removed by vacuuming at 70°C, and then 150g amino-terminated polyoxyethylene ether (molecular weight was 3000 ), 2.3g concentrated sulfuric acid (concentration 98%), add 13.03g toluene when the temperature rises to 100°C, and continue to heat up to 160°C to carry out amidation reaction. Vacuumize to remove toluene, neutralize with 39.2g of 10% potassium hydroxide solution to pH 6 when the temperature is lowered to 60°C, cool to 25°C to obtain the reaction product polyisoacryl polyoxyethylene ether amine, and finally Adding 216.98g of water to dilute to obtain a concentration of 40% polycarboxylate water reducer.

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Abstract

The invention relates to a preparation method for synthesizing a high-performance polycarboxylic acid water reducing agent by undergoing a one-step amidation reaction, belonging to the field of water reducing agents. In the invention, a high-performance polycarboxylic acid water reducing agent material is prepared by directly reacting with a one-step amidation method, i.e., the water reducing agent is obtained by undergoing an amidation reaction on reactants which are respectively polymethacrylic acid and methoxyl polyethenoxy ether containing amino at the other end under the action of a catalyst. The method has the advantages of conveniently-controlled process, easiness, practicability, low cost and environmental friendliness. An amide structure and a polyethenoxy ether structure are introduced into the molecular structure of the polycarboxylic acid water reducing agent by undergoing a one-step amidation reaction, so that high flow property of cement is realized, the flow property keeping ability and the cement adaptability are remarkably enhanced, and high flowability can be achieved under the conditions of low cement water factor and low mix proportion.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate high-performance water reducer for cement concrete, in particular to a specific preparation method for synthesizing a polycarboxylate high-performance water reducer by one-step amidation reaction. Background technique [0002] Since the beginning of the new century, with the rapid development of science and technology in the world, my country's economic and technological strength has also grown rapidly, and the entire construction industry has also undergone tremendous changes. Various basic building components that require high strength and high durability Therefore, the demand for high-performance water-reducing agents used in concrete is also increasing year by year, which requires not only increasing the production of water-reducing agents, but also synthesizing a variety of water-reducing agent materials with excellent characteristics . [0003] At present, the production of polycarb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C04B24/28C04B103/30
Inventor 刘晓王子明崔素萍兰明章毛倩瑾王亚丽
Owner BEIJING UNIV OF TECH
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