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Method for catalytically synthesizing polycarboxylate water reducing agent by zinc salt

A technology for synthesizing polycarboxylic acid and synthesizing polycarboxylic acid catalyzed by zinc salt is applied in the field of catalyzing synthesis of polycarboxylate water reducer by zinc salt, which can solve the problem of insufficient dispersion performance and slump retention performance, reduce market competitiveness, increase production cost, etc. problem, to achieve the effect of high redox efficiency, short total reaction time and easy operation

Inactive Publication Date: 2018-12-28
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The redox initiation system used in the production of polycarboxylate superplasticizers mainly uses peroxides such as ammonium persulfate and potassium persulfate as initiators, and uses heating to synthesize polycarboxylate superplasticizers. The polymerization reaction temperature is usually 60-90°C , Higher temperature increases energy consumption and production cost, thereby reducing the market competitiveness of the product, and the dispersion performance and slump retention performance of the product are also insufficient

Method used

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  • Method for catalytically synthesizing polycarboxylate water reducing agent by zinc salt
  • Method for catalytically synthesizing polycarboxylate water reducing agent by zinc salt
  • Method for catalytically synthesizing polycarboxylate water reducing agent by zinc salt

Examples

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Effect test

Embodiment 1

[0041] A method for zinc salt catalyzed synthesis of polycarboxylate water reducer, the steps are: prepare A liquid (weigh 3.09 g of small monomer, 0.15 g of thioglycolic acid and 15 g of distilled water and mix) and B liquid (sodium bisulfite 0.12 g) respectively , zinc sulfate 0.03g and distilled water 20g) stand-by, add macromonomer (TPEG) 26.91g and distilled water 15g in the three-necked flask with thermometer, gradually heat up and stir to dissolve, until the temperature reaches 47 ℃ and the macromonomer is completely When dissolving, add 0.33g of hydrogen peroxide, after mixing evenly, use the constant pressure dropping funnel to drop A solution (61min) and B solution (92min) at a constant speed at the same time, keep warm for 1h, cool to room temperature, that is obtained by A polycarboxylate superplasticizer with good practical performance synthesized by zinc salt catalysis.

Embodiment 2

[0043] A method for zinc salt catalyzed synthesis of polycarboxylate water reducer, the steps are: prepare A liquid (weigh 3.14 g of small monomer, 0.16 g of thioglycolic acid and 15 g of distilled water and mix) and B liquid (sodium bisulfite 0.10 g) respectively , zinc sulfate 0.04g and distilled water 20g) stand-by, add macromonomer (TPEG) 26.86g and distilled water 15g in the three-necked flask with thermometer, gradually heat up and stir to dissolve, until the temperature reaches 48 ℃ and the macromonomer is completely When dissolving, add 0.31g hydrogen peroxide, after mixing evenly, use the constant pressure dropping funnel to drop A liquid (60min) and B liquid (89min) at a constant speed at the same time, keep warm for 1h, cool to room temperature, that is obtained by A polycarboxylate superplasticizer with good practical performance synthesized by zinc salt catalysis.

Embodiment 3

[0045] A method for zinc salt catalyzed synthesis of polycarboxylate water reducer, the steps are: prepare A liquid (weigh 3.19 g of small monomer, 0.17 g of thioglycolic acid and 15 g of distilled water and mix) and B liquid (sodium bisulfite 0.08 g) respectively , 0.06g of zinc sulfate and 20g of distilled water) stand-by, add 26.81g of macromonomer (TPEG) and 15g of distilled water into a three-necked flask equipped with a thermometer, gradually heat up and stir to dissolve, until the temperature reaches 49°C and the macromonomer is completely When dissolving, add 0.29g of hydrogen peroxide, after mixing evenly, use the constant pressure dropping funnel to drop A solution (58min) and B solution (91min) at a constant speed at the same time, keep warm for 1h, cool to room temperature, that is obtained by A polycarboxylate superplasticizer with good practical performance synthesized by zinc salt catalysis.

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Abstract

The invention discloses a method for catalytically synthesizing a polycarboxylate water reducing agent by zinc salt. The method is characterized by comprising taking macromonomer, small monomer, chaintransfer agent, reducing agent, oxidant, catalyst and water; mixing the small monomer and the chain transfer agent to prepare a liquid A; mixing the reducing agent and the water to prepare a liquid B; adding the macromonomer and the water into a reactor with a thermometer, and heating and stirring; when the temperature reaches 47-52 DEG C and the macromonomer is completely dissolved, adding the oxidant, mixing, and adding dropwise at a uniform speed into the liquid A and the liquid B, wherein the total time for dropwise adding and heat insulation reaction is 2-2.5 h, cooling the materials after the reaction to room temperature, and obtaining the polycarboxylate water reducing agent. By the adoption of the method, the reaction temperature is low, the production efficiency is high, the production cost is low, the product dispersing performance and slump retention performance are good, industrial production can be performed, the practicality is high, and the obtained polycarboxylate water reducing agent is particularly suitable for preparation of cement-based building materials.

Description

technical field [0001] The invention belongs to a preparation method of a water reducer, and relates to a method for synthesizing a polycarboxylate water reducer by zinc salt catalysis. The polycarboxylate water reducer prepared by the invention is suitable for concrete admixtures and building materials. Background technique [0002] As the main building material, concrete has played an increasingly important role in national construction and development. As a key component of concrete admixture, water reducing agent can reduce the water consumption per unit volume of concrete, improve the working performance of ready-mixed concrete, improve the strength and service life of hardened concrete, etc. Polycarboxylate superplasticizer is a molecule with a comb structure, which has the advantages of high water reducing rate and can improve the pore structure and compactness of concrete. As one of the most important concrete admixtures, polycarboxylate superplasticizer has the ch...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F4/10C08F4/40C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F4/10C08F4/40C08F283/065C08F220/06
Inventor 刘才林冯全祥任先艳杨海君王玉平黄钰茜
Owner SOUTHWEAT UNIV OF SCI & TECH
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