Preparation method of polycarboxylic acid high-performance cement water reducing agent

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of cement water reducing agent preparation, to achieve high water reducing rate, increase strength, and improve market competitiveness

Active Publication Date: 2014-09-03
河北凯美思建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to reduce production costs or improve cost performance, many researchers or manufacturers are still exploring new formulas. The group is a monomer, and there are many studies on partially replacing other unsaturated acids or unsaturated sulfonic acids, but there is still room for improvement in the cost performance of polycarboxylic acids

Method used

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  • Preparation method of polycarboxylic acid high-performance cement water reducing agent
  • Preparation method of polycarboxylic acid high-performance cement water reducing agent
  • Preparation method of polycarboxylic acid high-performance cement water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Glycidyl methacrylate and anhydrous citric acid have a molar ratio of 1.0:1.05 (mol:mol), add an appropriate amount of polymerization inhibitor and ring-opening esterification catalyst, the reaction temperature is 90~110°C, react for 2 hours, and cool down to Below 40°C, the reaction product is made into an aqueous solution with a concentration of 40% (weight) for the next polymerization reaction, and the molar concentration of the reaction product is calculated based on glycidyl methacrylate. The reactant (40% (weight) aqueous solution) of methallyl polyglycol ether (molecular weight 2400), acrylic acid, glycidyl methacrylate prepared above and anhydrous citric acid is molar The ratio is 1.0:3.0:1.5, and then mixed with the calculated amount of deionized water to obtain the mixed monomer for the drop reaction; the solid content of the polycarboxylic acid (the weight concentration of the contained solid) is based on 40% ( weight) design, the polymerization reaction is b...

Embodiment 2

[0023]Glycidyl methacrylate and anhydrous tartaric acid have a molar ratio of 1.0:1.3 (mol:mol), add an appropriate amount of polymerization inhibitor and ring-opening esterification catalyst, the reaction temperature is 85~100°C, react for 3 hours, and cool down to 40°C Below ℃, the reaction product is made into an aqueous solution with a concentration of 40% (weight) for the next polymerization reaction, and the molar concentration of the reaction product is calculated based on glycidyl methacrylate. Three monomers of methallyl polyglycol ether (molecular weight 2400), methacrylic acid, the reaction product of glycidyl methacrylate prepared above and anhydrous tartaric acid (aqueous solution with a concentration of 40% (by weight)) Mix according to the molar ratio of 1.0:3.5:0.75, and then add the calculated amount of deionized water to obtain the mixed monomer for the drop reaction; the solid content of polycarboxylic acid (the weight concentration of the contained solid) is...

Embodiment 3

[0025] The molar ratio of glycidyl methacrylate to malonic acid is 1.0:1.1 (mol:mol), the reaction temperature is 105~110°C, the reaction is 2h, the temperature is lowered to below 40°C, and the concentration of the reaction product is 40% (weight). The aqueous solution is used for the polymerization reaction of the next step, and the molar concentration calculation of the reaction product is based on glycidyl methacrylate. The reaction product of methoxy-terminated methallyl polyglycol ether (molecular weight 2400), acrylic acid, glycidyl methacrylate prepared above and malonic acid (the reaction product has a concentration of 40% (by weight) Aqueous solution) three kinds of monomers are mixed according to molar ratio 1:3.7:0.5, then add the calculated amount of deionized water to obtain the mixed monomers for drop reaction; the solid content of polycarboxylic acid is 40% (weight ) design, the polymerization reaction is based on deionized water, the polymerization temperature...

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Abstract

The invention relates to a preparation method of a polycarboxylic acid high-performance cement water reducing agent, which comprises the following steps: preparing reactants glycidyl methacrylate and multielement organic acid; mixing acrylic acid, alkenyl polyethenoxy ether big monomer, the reactants and a calculated amount of deionized water into mixed monomers, respectively dropwisely adding an initiator water solution and the mixed monomers at polymerization reaction temperature by using the deionized water as the substrate, carrying out polymerization reaction, cooling, and neutralizing to obtain the polycarboxylic acid high-performance cement water reducing agent. The reactants glycidyl methacrylate and multielement organic acid are introduced into the water reducing agent structure as the synthetic monomers; and the prepared cement water reducing agent has favorable dispersivity in the early stage and can be hydrolyzed into multielement organic acid under alkaline conditions, and the side chain of the polycarboxylic acid can generate new carboxyl groups, thereby enhancing the slump retaining property and water reducing rate of the cement water reducing agent and greatly lowering the production cost of the cement water reducing agent.

Description

technical field [0001] The present invention relates to a preparation method of cement water reducing agent, especially a polycarboxylic acid high-performance cement water reducing agent that introduces the reactant of glycidyl methacrylate and polybasic organic acid into the structure of the water reducing agent as a synthetic monomer. The preparation method of the agent. Background of the invention [0002] Polycarboxylate cement water reducer (superplasticizer) has the advantages of good dispersibility, high water reducing rate, small slump loss, molecular structure diversity and designability, and environmental friendliness in the preparation process and use process. It is becoming the main type of water reducing agent for concrete. Judging from the structure and composition of the polymerized monomers of the existing commercialized polycarboxylate high-performance water reducing agent, it is mainly based on polyoxyethylene ether or polyoxyethylene ether with unsaturate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/20C04B24/26C04B103/30
Inventor 吕志平王卫星李晓峰
Owner 河北凯美思建筑材料有限公司
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