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Normal-temperature synthesis method for polycarboxylic acid water-reducing agent

A technology for synthesizing and superplasticizing agents at room temperature, which is applied in the field of preparation of high-performance concrete superplasticizers. It can solve the problems of difficult reaction control, general dispersion effect, and increased production costs, so as to achieve excellent application performance, reduce production costs, and save energy. cost effect

Active Publication Date: 2011-02-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nitrogen gas needs to be introduced in the synthesis of this method, which is not easy to control the reaction, but also increases the production cost, and the dispersion effect is general and the dosage is high

Method used

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  • Normal-temperature synthesis method for polycarboxylic acid water-reducing agent
  • Normal-temperature synthesis method for polycarboxylic acid water-reducing agent
  • Normal-temperature synthesis method for polycarboxylic acid water-reducing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Put 72.0g of polyoxyethylene polymerization degree n=15 methyl alkenyl polyoxyethylene ether (TPEG) and 114.45g of water into a four-neck flask, stir in a water bath and heat to 5°C. After the macromonomer is completely dissolved, 2.2g of acrylic acid, 2.94g of maleic anhydride, 0.22g of sodium allyl sulfonate, 0.75g of ammonium persulfate, and 0.17g of sodium bisulfite are sequentially added every five minutes. After constant temperature reaction for 3.0 hours, 9.0 g of NaOH solution with a mass fraction of 40% was added to adjust pH=6. The prepared concentration is 40% water reducer product 1.

Embodiment 2

[0034] Put 72.0 g of polyoxyethylene polymerization degree n=23 allyl polyethylene glycol (APEG) and 49.1 g of water into a four-neck flask, stir and heat in a water bath to 10°C. 2.46g of potassium persulfate was dissolved in 46.74g of water to make a solution with a mass fraction of 5%. 1.8g of sodium ascorbate was dissolved in 34.2g of water to make a solution with a mass fraction of 5%. After all the macromonomers were dissolved, 2.16 g of acrylic acid, 7.8 g of citraconic acid, and 0.47 g of sodium methacrylic acid were added sequentially every five minutes. After stirring for five minutes, potassium persulfate solution and sodium ascorbate solution were added dropwise for 2.0 hours, and after the addition was completed, the mixture was reacted at constant temperature for 2.0 hours. 21 g of KOH solution with a mass fraction of 40% was added to adjust pH=7. The prepared concentration is 40% water reducer product 2.

Embodiment 3

[0036] Put 72.0 g of polyoxyethylene polymerization degree n=45 methoxypolyethylene glycol acrylate (MPEG-AA) and 102.8 g of water into a four-neck flask, stir and heat in a water bath to 15°C. 4.8g of ascorbic acid was dissolved in 43.2g of water to make a solution with a mass fraction of 10%. After the macromonomer is completely dissolved, 4.32g of acrylic acid, 10.45g of fumaric acid, 1.24g of sodium styrene sulfonate, and 4.34g of sodium persulfate are sequentially added every five minutes. After stirring for five minutes, the ascorbic acid solution was added dropwise for 2.0 hours. After the dropwise addition was completed, the reaction was carried out at constant temperature for 3.0 hours. Add 14.4 g of ethylenediamine to adjust pH=8. The prepared concentration is 40% water reducer product 3.

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Abstract

The invention discloses a normal-temperature synthesis method for a polycarboxylic acid water-reducing agent, and belongs to the field of cement concrete water-reducing agents. The water-reducing agent is prepared by the following steps of: copolymerizing polyoxyethylene ether monomer or polyoxyethylene ester monomer a containing unsaturated double bonds, unsaturated monocarboxylic acid and derivative monomer thereof b, unsaturated dicarboxylic acid c and unsaturated sulfonic acid or salt monomer thereof d in aqueous solution under the action of an oxidation reduction initiator, and finally neutralizing the solution by using alkali solution to obtain the water-reducing agent. The reaction can be performed at room temperature by adopting an oxidation reduction initiating system, and the appropriate reaction temperature is between 5 and 30 DEG C; and the synthesis process does not need heating, so energy is saved, and high-temperature side reaction is effectively controlled. The prepared polycarboxylic acid high-performance water-reducing agent has the characteristics of high water-reducing rate and good collapse protecting performance. The water-reducing agent has wide application range, and the method has low production process requirement and is suitable for industrialized large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of a high-performance concrete water reducer, in particular to a method for synthesizing a polycarboxylate water reducer at room temperature. Background technique [0002] As the durability and strength requirements of concrete buildings in engineering construction and application are getting higher and higher, this requires the development of polycarboxylate superplasticizers with higher performance. In recent years, with the country's increasing emphasis on energy saving and emission reduction and the rapid promotion of the concept of low-carbon economy, scientific and technological workers are striving to improve the performance of concrete water reducers while also paying attention to how to reduce energy consumption. [0003] Patent CN101530760A proposes a method to synthesize a high-efficiency polyether-based supernatant by copolymerizing allyl polyethylene glycol and unsaturated carboxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/40C08F290/06C04B103/30C04B24/16
CPCC04B24/2647
Inventor 王子明徐莹吴昊刘晓郑付营李慧群崔素萍兰明章王亚丽
Owner BEIJING UNIV OF TECH
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