Heat source-free short-time preparation method of controlled-release type polycarboxylic acid high-performance slump retaining agent

A slow-release polycarboxylic acid, high-performance technology, applied in the field of polycarboxylate water reducer, can solve the problems of insufficient slump retention capacity of the water reducer, and achieve the effects of simple equipment, good slump retention performance and simple preparation process

Active Publication Date: 2014-06-25
山东卓星化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a short-time preparation method without a heat source of a slow-release polycarboxylic acid high-performance slump-retaining agent. The method takes unsaturated polyoxyethylene ether and hydroxyethyl acrylate as main raw materials, and at normal temperature, A polycarboxylate superplasticizer with slow release and high slump retention performance was synthesized in a short period of time to solve the problem of insufficient slump retention ability of current polyether polycarboxylate superplasticizers

Method used

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  • Heat source-free short-time preparation method of controlled-release type polycarboxylic acid high-performance slump retaining agent
  • Heat source-free short-time preparation method of controlled-release type polycarboxylic acid high-performance slump retaining agent
  • Heat source-free short-time preparation method of controlled-release type polycarboxylic acid high-performance slump retaining agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Put 330.5g of methallyl polyoxyethylene ether with a molecular weight of 2400 into a 1000m1 three-necked flask with an insulating jacket, add 330g of water, and stir for 0.5h; after the methallyl polyoxyethylene ether is completely dissolved, put in 3.5 g ammonium persulfate and 0.8 g sodium bisulfite, stir well for 2 min; simultaneously titrate the mixture containing 20 g of acrylic acid, 21 g of hydroxyethyl acrylate, 2.3 g of AMPS and 50 g of water, and the mixture of 2.1 g of thioglycolic acid and 80 g of water; 1 h at the same time After dripping, keep warm for 0.5h after titration; add a certain amount of lye to adjust the pH to 6-7, and add a certain amount of water to dilute to a solid content of 40%.

Embodiment 2

[0028] Put 330.5g of methallyl polyoxyethylene ether with a molecular weight of 2400 into a 1000m1 three-necked flask with an insulated jacket, add 330g of water, and stir for 0.5h; g ammonium persulfate, 0.5g sodium bisulfite and 0.4g vitamin C, stir well for 2min; simultaneously titrate the mixture containing 19g acrylic acid, 22g hydroxyethyl acrylate, 2.5g AMPS and 50g water and 2.6g thioglycolic acid and 80g water Mixed solution; 1h at the same time, keep warm for 0.5h after titration; add a certain amount of lye to adjust the pH to 6-7, and add a certain amount of water to dilute to a solid content of 40%.

Embodiment 3

[0030] Put 330.5g of methallyl polyoxyethylene ether with a molecular weight of 2400 into a 1000m1 three-necked flask with an insulating jacket, add 330g of water, and stir for 0.5h; after the methallyl polyoxyethylene ether is completely dissolved, put in 3.2 1g ammonium persulfate and 0.83g hang white block, fully stirred for 2min; simultaneously titrate the mixed solution containing 19.5g acrylic acid, 20.5g hydroxyethyl acrylate, 2.1g AMPS and 50g water and the mixed solution of 2.2g thioglycolic acid and 80g water; 1h; At the same time, after the titration is completed, keep warm for 0.5h; add a certain amount of lye to adjust the pH to 6-7, and add a certain amount of water to dilute to a solid content of 40%.

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Abstract

The invention relates to a polycarboxylate superplasticizer, and particularly relates to a heat source-free short-time preparation method of a controlled-release type polycarboxylic acid high-performance slump retaining agent. The heat source-free short-time preparation method comprises the following steps: adding methyl allyl polyethenoxy ether and water in a container, after stirring for 0.5 hour at normal temperature, adding an initiator and an initiation additive, stirring for 2min at normal temperature; titrating a mixed water solution of acrylic acid, hydroxyethyl acrylate and 2-acrylamide-2-methylacrylsulfonate, and a chain transfer agent water solution simultaneously within 1 hour, then insulating heat for 0.5 hour, regulating a pH value to 6-7 by adopting an alkaline liquor, and finally diluting by adding water until the solid content is 40 percent. The heat source-free short-time preparation method is simple in preparation process, simple in equipment, and free from heating in the whole reaction process so that energy resources are saved; the production period is only 2 hours, and thus the production efficiency is greatly increased, and the application range is wide; and the synthesized controlled-release type polycarboxylic acid high-performance slump retaining agent has the characteristics of less doping amount, good slump retaining property, environment friendliness and the like.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a short-time preparation method of a slow-release polycarboxylate high-performance slump-retaining agent without a heat source. Background technique [0002] At present, my country is vigorously developing infrastructure, and the demand for commercial concrete is strong, and the market share of polycarboxylate superplasticizer, which is one of commercial concrete admixtures, is increasing. In the fierce market competition, products with high water reduction rate, slump retention effect and low cost will have a competitive advantage, which is also the direction that various scientific research institutions and enterprises are constantly pursuing. [0003] In the preparation process of polycarboxylate water reducer, it is generally necessary to select some monomer materials with different groups, and then synthesize the polymerizable structural unit into a water reducer with prede...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F220/58C08F2/38C04B24/16C04B103/30
Inventor 王建军王双平
Owner 山东卓星化工有限公司
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