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Ether type polycarboxylic acid slump retaining agent and preparation method thereof

A technology of ether polycarboxylic acid and slump retention agent, which is applied in the field of building material admixtures, can solve the problems of poor water reduction rate and slump retention, and achieves reduction of carboxyl group density, production cost reduction, and short reaction period. Effect

Inactive Publication Date: 2012-07-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product has certain slump retention properties, due to the limitations of the molecular structure of allyl polyether itself, the water reducing rate and slump retention properties are not very good

Method used

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  • Ether type polycarboxylic acid slump retaining agent and preparation method thereof
  • Ether type polycarboxylic acid slump retaining agent and preparation method thereof
  • Ether type polycarboxylic acid slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First add 120.0g methyl propyl polyoxyethylene ether, 6.0g sodium p-styrene sulfonate and 116.5g deionized water into the three-necked flask, stir until the materials are completely dissolved to a transparent state, add 2.0g hydrogen peroxide and continue stirring for 5-10 After 10 minutes, start to add solution A and solution B evenly, wherein solution A consists of 40.0g acrylic acid, 30.0g acrylate-β-hydroxypropyl and 40.5g deionized water; solution B consists of 1.0g sodium sulfite, 1.0g dodecane base mercaptan and 18g deionized water. The temperature was controlled at 40°C, and the dripping of solution A was completed in 3 hours, and the solution of B was dripped in 3.5 hours. After the B solution was dripped, continue to stir for 1h to ripen. Add 74.0 g of 30% liquid caustic soda, adjust the pH value to about 7, and adjust the concentration to 40% with deionized water to obtain the finished product. For its infrared spectrum, see figure 1 , see gel chromatogram...

Embodiment 2

[0033] First add 160.0g of methyl propyl polyoxyethylene ether, 6.0g of sodium p-styrene sulfonate and 113.0g of deionized water into the three-necked flask, stir until the materials are completely dissolved to a transparent state, then add 1.0g of hydrogen peroxide and continue stirring for 5-10 After 10 minutes, start to drop first solution and second solution evenly, wherein first solution is made up of 10.0g acrylic acid, 20.0g 2-hydroxy-2-butyl acrylate and 16.5g deionized water; second solution is made up of 2.0g sodium hypophosphite, 1.0g of 3-mercaptopropionic acid and 18g of deionized water. The temperature was controlled at 40°C, and the dripping of solution A was completed in 3 hours, and the solution of B was dripped in 3.5 hours. After the B solution was dripped, continue to stir for 1h to ripen. Add 18.5g of 30% liquid caustic soda, adjust the pH value to about 7, and adjust the concentration to 40% with deionized water to obtain the finished product.

Embodiment 3

[0035] First add 150.0g of methyl propyl polyoxyethylene ether, 16.0g of sodium p-styrene sulfonate and 110.0g of deionized water into the three-necked flask, stir until the materials are completely dissolved to a transparent state, then add 2.0g of hydrogen peroxide and continue stirring for 5-10 After 10 minutes, start to add solution A and solution B evenly, wherein solution A consists of 20.0g acrylic acid, 10.0g ethyl acrylate and 30.0g deionized water; solution B consists of 1.0g L-ascorbic acid, 1.0g 3-mercaptoacetic acid and 18g deionized water composition. The temperature is controlled at 50°C, and the solution of A is controlled to be dripped in 3 hours, and the solution of B is dripped in 4.5 hours. After the B solution was dripped, continue to stir for 1h to ripen. Add 37.0 g of 30% liquid caustic soda, adjust the pH value to about 7, and adjust the concentration to 40% with deionized water to obtain the finished product.

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Abstract

The invention discloses an ether type polycarboxylic acid slump retaining agent and a preparation method thereof. The slump retaining agent is prepared by the following steps of: adding methyl allyl polyethenoxy ether, sodium p-styrene sulfonate and an oxidant into a reaction kettle; adding water, mixing and stirring to obtain uniformly mixed solution; controlling the temperature of the obtained mixed solution at 30-60 DEG C; simultaneously dropwise adding solution A and solution B, wherein the solution A is obtained by dissolving acrylic ester and acrylic acid in water, the dropping time of the solution A is controlled to be 3-4 hours, the solution B is obtained by dissolving a reducing agent and a chain transfer in water and the dropping time of the solution B is controlled to be 3.5-4.5 hours; continuously stirring the obtained solution for 1-1.5 hours; adjusting the pH value of the solution to be 7; adding a proper amount of de-ionized water; and discharging to obtain the ether type polycarboxylic acid slump retaining agent. The prepared slump retaining agent is used in cement paste; the cement paste fluidity is not lost or increased within 2 hours; and the concrete slump loss is extremely low by applying the slump retaining agent to concrete.

Description

technical field [0001] The invention belongs to the field of building material admixtures, and in particular relates to an ether polycarboxylic acid slump retaining agent and a preparation method thereof. Background technique [0002] Since the 1980s, Japan, the United States, Europe and other countries have developed a new generation of polycarboxylate-based high-performance water reducers. Compared with traditional water-reducers, polycarboxylate-based high-performance water-reducers have a high water-reducing rate, Due to the advantages of low dosage and no pollution to the environment, polycarboxylic acid admixtures are more and more widely used. However, with the construction of a large number of national major projects, passenger dedicated lines, water conservancy and hydropower projects, the supply of main raw materials for concrete has become tight, which has resulted in a downward trend in the quality of coarse aggregate, mineral admixtures, fine aggregate, and ceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F212/14C08F220/14C08F220/18C08F220/28C04B24/20C04B103/30
Inventor 马保国胡家兵谭洪波
Owner WUHAN UNIV OF TECH
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