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A polycar carboxylic acid system polymer water reduction agent and its preparation method

A polycarboxylic acid series and polymer technology, which is applied in the field of polycarboxylate polymer water reducing agent and its preparation, water reducing agent and its preparation field, can solve the problem of late start of research on polycarboxylate water reducing agent, etc. Conducive to industrialization and application, simple production process, strong steric hindrance effect

Active Publication Date: 2018-09-28
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polycarboxylate superplasticizers have become the focus of attention due to the advantages of low dosage, high water reducing rate, and good slump retention. However, the research on polycarboxylate superplasticizers in my country started late, so the development of polycarboxylate Carboxylic acid-based high-performance water reducers are of positive significance for promoting the development of my country's concrete chemical admixture industry

Method used

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  • A polycar carboxylic acid system polymer water reduction agent and its preparation method
  • A polycar carboxylic acid system polymer water reduction agent and its preparation method
  • A polycar carboxylic acid system polymer water reduction agent and its preparation method

Examples

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Effect test

Embodiment 1

[0027] Molar ratio: N-[4-(sulfonamide)phenyl]acrylamide:polyethylene glycol monomethyl ether itaconate (n=20-30):polyethylene glycol monomethyl ether methacrylate (m= 20-30)=1.0:1.2:1.2 Prepare the raw materials. The above raw materials and the initiator ammonium persulfate are diluted with deionized water to form an aqueous solution with a mass concentration of 32%. In the reaction kettle equipped with electric stirrer, condenser, thermometer and water bath heating conditions, add polyethylene glycol monomethyl ether itaconate and N-[4-(sulfonamide)phenyl ] acrylamide aqueous solution, stir and heat up to 70°C, add polyethylene glycol monomethyl ether methacrylate aqueous solution, then open the pear-shaped separatory funnel, add diluted ammonium persulfate aqueous solution to the reaction kettle dropwise, pass through before diluting Ammonium sulfate consumption is 0.5% of the total mass of the monomer. The drip control speed is completed within 2 hours. After dripping, ke...

Embodiment 2

[0030] Molar ratio: N-[4-(sulfonamide)phenyl]methacrylamide: polyethylene glycol monomethyl ether itaconate

[0031] (n= 30-40): Polyethylene glycol monomethyl ether methacrylate (m= 30-40)=1:1.3:1.2 Prepare the raw materials, the above raw materials and initiator potassium persulfate are separated with deionized water Diluted into an aqueous solution with a mass concentration of 35%. In the reaction kettle equipped with electric stirrer, condenser, thermometer and water bath heating conditions, add polyethylene glycol monomethyl ether itaconate and N-[4-(sulfonamide)phenyl ] methacrylamide aqueous solution, stir and heat up to 60 ° C, add polyethylene glycol monomethyl ether methacrylate aqueous solution, then open the pear-shaped separatory funnel, drop diluted potassium persulfate aqueous solution into the reaction kettle, dilute The amount of pre-persulfate potassium is 1% of the total mass of the monomer. The drip control speed is completed within 2 hours. After drippi...

Embodiment 3

[0034] Molar ratio: N-[4-(sulfonamide)phenyl]methacrylamide: polyethylene glycol monomethyl ether itaconate (m=30-40): allyl polyoxyethylene ether x = 30-40) = 1:0.9:1.2 Prepare the raw materials. The above raw materials and the initiator sodium persulfate are diluted with deionized water to form an aqueous solution with a mass concentration of 40%. In the reaction kettle equipped with electric stirrer, condenser, thermometer and water bath heating conditions, add polyethylene glycol monomethyl ether itaconate and N-[4-(sulfonamide)phenyl ] methacrylamide aqueous solution, stir and heat up to 90 ° C, add allyl polyoxyethylene ether aqueous solution, then open the pear-shaped separatory funnel, add the diluted sodium persulfate aqueous solution dropwise to the reaction kettle, and dilute the persulfuric acid before The amount of sodium is 3% of the total mass of the monomer. The drip control speed is completed within 2 hours. After dripping, keep the temperature and react for...

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Abstract

The invention discloses a polycarboxylate-type macromolecular water reducer and a preparation method thereof, and belongs to the field of concrete additives. With methoxypolyethylene glycol ester macromonomers, allyl polyoxyethylene ether and amide monomers as raw materials, the polycarboxylate-type macromolecular water reducer is synthesized through a macromonomer direct copolycondensation method; the synergistic effect of multiple organic functional groups is effectively achieved, the defects of an existing water reducer product are overcome, the water reducing rate is increased, and the slump retaining property and the compressive strength are improved. According to the polycarboxylate-type macromolecular water reducer and the preparation method thereof, the production process is simple, the reaction conditions are easy to control, the production equipment requirement is low, and industrial application and popularization are easy.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a polycarboxylate polymer water reducer and a preparation method thereof, and belongs to the technical field of concrete admixtures. Background technique [0002] Polycarboxylate superplasticizers have become the focus of attention due to the advantages of low dosage, high water reducing rate, and good slump retention. However, the research on polycarboxylate superplasticizers in my country started late, so the development of polycarboxylate Carboxylic acid-based high-performance water reducers are of positive significance for promoting the development of my country's concrete chemical admixture industry. Most of the polycarboxylate water reducers reported so far are synthesized by the copolymerization reaction of a large monomer and several small monomers in aqueous solution. For example, the literature (≪Concrete≫, 2010, 2, 74-77) discloses a method of synthes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/60C04B24/16C04B103/30
CPCC04B24/16C04B2103/302C08F283/065C08F220/606
Inventor 郭辉庄玉伟褚艳红张国宝曹健赵根锁
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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