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Method for preparing sustained-release polycarboxylic water reducer

A slow-release polycarboxylic acid and water-reducing agent technology, which is applied in the field of preparing high-performance water-reducing agents for concrete, can solve problems such as unsatisfactory product slow-release speed and performance, affecting construction progress, and excessive retardation of cement, so as to avoid The effects of rapid loss of slump, prevention of loss and evaporation, and safety of the reaction process

Active Publication Date: 2010-06-16
赣州科隆百亚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this method is that excessive use of retarder will cause excessive retardation of cement and affect the construction progress.
Because the ethers used are allyl ethers, its polymerization activity is low, and the hydrolysis rate of maleic anhydride is very fast, the slow release rate and performance of the product are still unsatisfactory

Method used

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  • Method for preparing sustained-release polycarboxylic water reducer
  • Method for preparing sustained-release polycarboxylic water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 70.0 g of allyl polyoxyethylene ether (APEG) with a degree of polymerization of polyoxyethylene n=15 and 206.42 g of water into a four-neck flask, stir and heat in a water bath to 40°C. 1.94g of methyl acrylate and 90.00g of N, N'-methylenebisacrylamide were dissolved in 100.0g of water, and fully dissolved to prepare a monomer mixed solution. 0.72g of ammonium persulfate was dissolved in 13.70g of water to make a solution with a mass fraction of 5%. Every 10 minutes, 48.65 g of sodium allyl sulfonate and 2.10 g of methacrylic acid were successively added into the four-necked flask, and the temperature was kept constant for 10 minutes. Afterwards, the temperature was raised to 60°C. The monomer mixed solution and the ammonium persulfate solution were added dropwise respectively, the time for both additions was 4.0 hours, and the constant temperature reaction was continued for 2.0 hours. After cooling to 40° C., 6.3 g of 40% NaOH solution was added to adjust pH=6. ...

Embodiment 2

[0031] Put 70.0 g of methoxypolyethylene glycol acrylate (MPEG-AA) with a degree of polymerization of polyoxyethylene n=23 and 82.5 g of water into a four-neck flask, stir and heat to 50° C. in a water bath. 6.56g of sodium p-styrene sulfonate, 22.9g of acrylic acid, 32.9g of methyl acrylate and 1.36g of dioxalic acid diacrylate were dissolved in 100g of water and fully dissolved to prepare a monomer mixed solution. 7.23g of ammonium persulfate was dissolved in 28.9g of water to make a solution with a mass fraction of 20%. The temperature was raised to 70°C, and the monomer mixed solution and ammonium persulfate solution were added dropwise. The dropping time of both was 3.0 hours, and the constant temperature reaction was continued for 1.0 hours. After cooling to 45°C, 8.2 g of 40% KOH solution was added to adjust pH=8. A water reducer product 2 with a concentration of 40% was prepared.

Embodiment 3

[0033] Put 70.0g of methyl alkenyl polyoxyethylene ether (TPEG) with a degree of polymerization of polyoxyethylene n=53 and 186.6g of water into a four-neck flask, stir in a water bath, heat to 55°C, and pour 18.4g of formazan in sequence every 10 minutes. Sodium propylene sulfonate, 8.4g of acrylic acid, 1.97g of diacetone acrylamide, 36.2g of N,N,-methylene bisacrylamide, and 19.2g of ammonium persulfate aqueous solution with a mass fraction of 7% were added to a four-necked flask, and kept at a constant temperature for 10min . Afterwards, the temperature was raised to 80°C, and the reaction was carried out at a constant temperature for 2.0 hours, then cooled to 50°C, and 5.6 g of ethylenediamine was added to adjust the pH to 7. A water reducer product 3 with a concentration of 40% was prepared.

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Abstract

The invention discloses a method for preparing a sustained-release polycarboxylic water reducer and belongs to the field of water reducers. The water reducer is prepared by the following steps: adding a macromonomer of a polyoxyethylene ether or ester containing an unsaturated double bond, an unsaturated sulfonic acid or a salt monomer a thereof, a mono-olefin carboxylic acid derivative b, a diolefin carboxylic acid derivative c and water to a reaction kettle; reacting at the temperature of between 60 and 85 DEG C for 1.0 to 6.0 hours under the action of persulfate of an initiator; and reducing the temperature to 40-55 DEG C, and neutralizing the mixture to a pH between 6 and 8 by using alkaline solution. The method for preparing the sustained-release polycarboxylic water reducer introduces the mono-olefin carboxylic acid derivative b and the diolefin carboxylic acid derivative c into a main chain of polycarboxylic acid, so that the prepared polycarboxylic water reducer has sustained-release effect on the fluidity of concrete. Therefore, the loss and evaporation of water content of concrete caused by long-time transportation and high temperature are effectively prevented, a bleeding phenomenon resulted from over-large slump of early strength concrete is avoided, and the problem of over-quick loss of the slump in the engineering is solved. The he sustained-release polycarboxylic water reducer can be applied to delivering and pumping construction of the concrete in high-temperature season.

Description

technical field [0001] The invention relates to the technical field of preparing a high-performance water reducer for concrete, and specifically designs a specific preparation method of a slow-release polycarboxylate water reducer. Background technique [0002] In recent years, with the rapid development of my country's construction industry, more and more types of water reducing agents are required. Due to my country's vast territory, obvious seasonal changes, and large differences in concrete raw materials, in the process of concrete transportation and construction, it is often encountered that the slump loss of fresh concrete is too fast, which brings a lot of inconvenience to engineering construction and concrete engineering quality control, especially The concrete is transported and pumped under high temperature conditions in summer. The water used for mixing the concrete is very easy to evaporate, and the water that provides lubrication decreases with time, and the flui...

Claims

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Application Information

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IPC IPC(8): C08F283/06C04B24/16C04B103/30
Inventor 王子明李慧群郑付营刘晓崔素萍兰明章王亚丽
Owner 赣州科隆百亚新材料有限公司
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