Method for synthesizing slow-release polycarboxylate water reducing agent

A polycarboxylic acid-based, slow-release technology, applied in the field of concrete admixture synthesis, can solve the problems of high energy consumption, high cost, and high concrete slump loss, achieve low construction investment, short production time, and prevent slump The effect of drop loss

Inactive Publication Date: 2014-05-14
吉林众鑫化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the disadvantages of high energy consumption, high cost, and high concrete slump loss in the prior art, improve the workability and adaptability of cement mixture, and provide a polycarboxylic acid slow-release cement Synthesis method of water agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 : Under the temperature condition of 15°C, add 300g of isopentenol polyoxyethylene ether with a molecular weight of 2200, 26.52g of maleic anhydride, and 230g of deionized water into a 1L four-necked flask, and control the concentration of maleic anhydride and large The monomers all dissolved into a clear solution. Then add 1.05g of 50% concentration hydrogen peroxide and 0.05g of ferrous sulfate heptahydrate in the solution. Solution B prepared by 23.45 g of hydroxyethyl acrylate and 23.4 g of deionized water, and solution C of 1.80 g of mercaptopropionic acid and 0.32 g of sodium formaldehyde sulfoxylate dissolved in 47 g of deionized water were added dropwise. The solution B was added dropwise for 60 minutes, and the solution C was added dropwise 3 minutes after the solution B was added dropwise, and the dropwise addition was completed within 75 minutes. After the solution C was added dropwise, the reaction was continued for 60 minutes, and 229.4 g of dei...

Embodiment 2

[0031] Example 2 : Under the temperature condition of 25°C, add 300g of isopentenol polyoxyethylene ether with a molecular weight of 2400, 26.52g of maleic anhydride, and 230g of deionized water into a 1L four-necked flask. The body completely dissolved into a transparent solution. Then add 50% concentration hydrogen peroxide 1.05g in the solution. Solution B prepared by 23.45 g of hydroxyethyl acrylate and 23.4 g of deionized water, and solution C of 1.80 g of mercaptopropionic acid and 0.32 g of sodium formaldehyde sulfoxylate dissolved in 47 g of deionized water were added dropwise. The solution B was added dropwise for 60 minutes, and the solution C was added dropwise 3 minutes after the solution B was added dropwise, and the dropwise addition was completed within 75 minutes. After the solution C was added dropwise, the reaction was continued for 60 minutes, and 229.31 g of deionized water was added to adjust the concentration of the water reducer to 40wt%, which was re...

Embodiment 3

[0032] Example 3: At a temperature of 10°C, add 300 g of isopentenol polyoxyethylene polyoxypropylene ether with a molecular weight of 2200, 15.32 g of maleic anhydride, and 230 g of deionized water into a 1L four-necked flask. Anhydrides and macromonomers are all dissolved into a transparent solution. Then add 0.95g of 50% concentration hydrogen peroxide and 0.04g of ferrous sulfate heptahydrate in the solution. A solution B made of 34.60 g of hydroxyethyl acrylate and 34.6 g of deionized water, and a solution C of 1.65 g of mercaptopropionic acid and 0.30 g of sodium formaldehyde sulfoxylate dissolved in 47 g of deionized water were added dropwise. The solution B was added dropwise for 120 minutes, and the solution C was added dropwise 3 minutes after the solution B was added dropwise, and the dropwise addition was completed within 150 minutes. After solution C was added dropwise, the reaction was continued for 30 minutes, and 217.71 g of deionized water was added to adju...

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PUM

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Abstract

The invention discloses a method for synthesizing a slow-release polycarboxylate water reducing agent. The method comprises the following steps: with isopentenol polyoxyethylene polyoxypropylene ether, maleic anhydride and hydroxyethyl acrylate as raw materials, hydrogen peroxide as an initiator, sodium formaldehyde sulfoxylate and ferrous sulfate as co-catalysts and mercaptopropionic acid or mercaptoacetic acid as a molecular weight regulator, initiating free radical polymerization at 5-40 DEG C, and adding water into a monomer and the maleic anhydride according to a ratio to prepare a water solution A; adding the initiator and the ferrous sulfate into the solution A in proportion; dropwise adding a solution B prepared from the molecular weight regulator and the sodium formaldehyde sulfoxylate in proportion into the solution A; dropwise adding a water solution C prepared by adding water into the hydroxyethyl acrylate into the solution A; dropwise adding the solution B after dropwise adding the solution C for 2-5 minutes; dropwise adding the solution C for 0.5-2 hours; finishing the adding of the solution B within 15-30 minutes after finishing the adding of the solution C; after finishing the adding of the solution B, reacting for another 0.5-1 hour, and preparing the 40% water reducing agent by using water.

Description

Technical field [0001] The present invention involves a synthesis method of concrete plus agent under the temperature of 5 ° C to 40 ° C, especially a gathering that can inhibit the slump loss of cement composition and improve its ease of harmony and applicability.The synthesis method of carboxylic acid mitter -release water reduction agent. Background technique [0002] Losses to slump in the concrete industry are a major problem. Transportation and pumping concrete are transported and pumped under high temperature conditions in summer. The slump loss is more serious. In order to ensure the better liquidity of the concrete kerators, it is easy to pump and pour, and the construction process.The phenomenon of adding water to reshape concrete will occur, which affects the intensity of concrete. In addition, the construction unit often requires concrete with ultra -long liquidity maintenance capabilities. Using conventional water reduction can not meet these requirements. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/06C08F220/28C08F2/38C08F4/40C04B24/32C04B103/30
Inventor 金冠男贾洪文陈迪伟邹灵俊姜皓
Owner 吉林众鑫化工集团有限公司
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