Preparation method of novel polyether-synthesis slow-release-type polycarboxylic acid water reducer

A slow-release polycarboxylic acid and water-reducing agent technology, applied in the field of concrete admixtures, can solve the problems of unfavorable industrial production, large energy consumption, complex production process, etc. Effect

Inactive Publication Date: 2019-04-19
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process is complicated and the energy consumption is large, which is not conducive to industrial production

Method used

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  • Preparation method of novel polyether-synthesis slow-release-type polycarboxylic acid water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 300g of polyether macromonomer and 220g of deionized water into the reaction kettle, stir at room temperature to dissolve, mix 35g of acrylic acid, 101g of hydroxyethyl acrylate, and 25g of deionized water to prepare liquid A. Mix 2g of mercaptopropionic acid, 4g of vitamin C, and 35g of water to prepare liquid B. Add 32g of liquid A to the macromonomer aqueous solution obtained in S1, stir evenly, add 4g of hydrogen peroxide, start to add liquid B dropwise after 2 minutes, and add liquid A dropwise after 2-10 minutes, and the time for adding liquid A is 30 minutes , B liquid dropwise adding time is 40min. After 20 minutes of heat preservation, 13g of lye was added for neutralization, and a new type of slow-release polycarboxylate superplasticizer was obtained.

Embodiment 2

[0027] Add 300g of polyether macromonomer and 220g of deionized water into the reaction kettle, stir at room temperature to make it melt, 50g of acrylic acid, 15.5g of 2-acrylamide-2-methylpropanesulfonic acid, 101g of hydroxyethyl acrylate, Mix 25g of deionized water evenly to make liquid A. Mix 2g of mercaptopropionic acid, 4g of vitamin C, and 35g of water to prepare liquid B. Add 35g of liquid A to the macromonomer aqueous solution obtained in S1, stir evenly, add 4g of hydrogen peroxide, start to add liquid B dropwise after 2 minutes, and add liquid A dropwise after 2-10 minutes, and the time for adding liquid A is 30 minutes , B liquid dropwise adding time is 40min. After 20 minutes of heat preservation, 13g of lye was added for neutralization, and a new type of slow-release polycarboxylate superplasticizer was obtained.

Embodiment 3

[0029] Add 300g of polyether macromonomer and 220g of deionized water into the reaction kettle, stir at room temperature to melt, mix 35g of acrylic acid, 80g of hydroxyethyl acrylate, and 24g of methyl methacrylate with 25g of deionized water to form a Liquid A. Mix 2g of mercaptopropionic acid, 4g of vitamin C, and 35g of water to prepare liquid B. Add 34g of liquid A to the macromonomer aqueous solution obtained in S1, stir evenly, add 4g of hydrogen peroxide, start to add liquid B dropwise after 2 minutes, and add liquid A dropwise after 2-10 minutes, and the time for adding liquid A is 30 minutes , B liquid dropwise adding time is 40min. After 20 minutes of heat preservation, 13g of lye was added for neutralization, and a new type of slow-release polycarboxylate superplasticizer was obtained.

[0030] Commercially available room temperature synthetic liquid ultra-high water-reducing polycarboxylate superplasticizer.

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Abstract

The invention discloses a preparation method of a novel polyether-synthesis slow-release-type polycarboxylic acid water reducer. The method comprises the following steps that S1, a polyether macromonomer and deionized water are added into a reaction kettle, stirred at the normal temperature and dissolved, and a small unsaturated acid or anhydride monomer and a small unsaturation esters monomer aremixed in water to obtain an A solution; a reduction agent, a chain transfer agent and water are sufficiently mixed to obtain a B solution for use; S2, a certain amount of A solution is added to a macromonomer aqueous solution obtained in the step S1, and even stirring is conducted; S3, an oxidizing agent is added to the mixture obtained in the step S2 in advance, then the B solution is dropwise added, the A solution is dropwise added after the B solution is dropwise added for 2-10 min, and after drip addition is completed, heat preservation is conducted for 0.5 h; S4, after a reaction is completed, an alkaline solution is added for neutralization, the product is poured out, and the slow-release-type polycarboxylic acid water reducer is obtained. The obtained slow-release-type polycarboxylic acid water reducer has the advantages that the slow release time is long, the slump degree can be maintained for a long time, and the slump result is excellent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a preparation method of a novel polyether-synthesized slow-release polycarboxylate water reducer. Background technique [0002] As the third generation of concrete admixture, polycarboxylate superplasticizer has been vigorously promoted because of its high water reducing rate, good cement adaptability, and environmental protection in the production process. As a result, my country's polyether large orders The sports industry has also developed by leaps and bounds. The production and production capacity of polyether macromonomers in the country continued to increase, reaching the highest level in history in 2017. At present, the polyethers commonly used in the synthesis of polycarboxylate superplasticizers are mostly HPEG and TPEG, and the product structure is relatively simple, and the supply of its initiators is still partially dependent on imports, especially the 5-...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/20
Inventor 周普玉王英维张智达徐忠洲
Owner SHANXI SUNWAY INTION TRADE CO LTD
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