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A kind of preparation method of early-strength polycarboxylate water reducer

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixture, can solve the problems of delayed concrete setting time, high synthesis cost, steel bar corrosion, etc., achieve early strength and outstanding water reducing effect, stable product quality, and production The effect of simple process

Active Publication Date: 2021-03-26
南京建高新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: large dosage, easy introduction of chloride ions or alkali metals, causing corrosion of steel bars and alkali-aggregate reaction, reducing the durability of concrete
There are mainly the following problems in the prior art: 1. When the early-strength function is introduced, part of the water-reducing performance is sacrificed, and some technologies introduce retarding components, which will delay the setting time of the concrete; 2. Synthesis of early-strength functional monomers The process is relatively complicated. Some volatile small molecule alcohol by-products will inhibit the cement hydration reaction during some reactions; some require solvents for dispersion, heat transfer or filtration and purification; high

Method used

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  • A kind of preparation method of early-strength polycarboxylate water reducer

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: Esterification and amidation reaction of maleic anhydride

[0026] 3.9kg of maleic anhydride, 5kg of triethanolamine, 35g of polymerization inhibitor and 20kg of hydroxyl-terminated polyethylene glycol monomethyl ether with a molecular weight of 2000 were mixed evenly, under the catalytic action of 28g of p-toluenesulfonic acid, heated at 120 degrees Celsius The reaction was carried out for 1 hour; 6 kg of ground p-aminobenzenesulfonic acid was added, and the reaction was continued at 120 degrees Celsius for 0.5 hour to obtain a mixture I.

Embodiment 2

[0027] Embodiment 2: Esterification and amidation reaction of maleic anhydride

[0028] 12.5kg of maleic anhydride, 10kg of triethanolamine, 60g of polymerization inhibitor and 30kg of hydroxyl-terminated polyethylene glycol monomethyl ether with a molecular weight of 2000 were mixed evenly, under the catalytic action of 60g of p-toluenesulfonic acid, heated at 110 degrees Celsius The reaction was carried out for 2 hours; 7 kg of ground p-aminobenzenesulfonic acid was added, and the reaction was continued at 110 degrees Celsius for 1 hour to obtain a mixture I.

Embodiment 3

[0029] Embodiment 3: Esterification and amidation reaction of maleic anhydride

[0030]8.5kg of maleic anhydride, 7.5kg of triethanolamine, 50g of polymerization inhibitor and 25kg of hydroxyl-terminated polyethylene glycol monomethyl ether with a molecular weight of 2000 were mixed uniformly. 6.5 kg of ground p-aminobenzenesulfonic acid was added, and the reaction was continued at 115 degrees Celsius for 0.75 hours to obtain mixture I.

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Abstract

The invention discloses an early-strength polycarboxylate superplasticizer and a preparation method. The early-strength polycarboxylate superplasticizer is prepared from maleic acid, triethanolamine,aminobenzene sulfonic acid, hydroxyl-terminated polyoxyethylene monomethyl ether, acrylamide, acrylic acid and isoamyl polyoxyethylene ether. The early-strength polycarboxylate superplasticizer is excellent in performance, stable in process, high in water reducing efficiency, remarkable in early strength effect, high in aggregate adaptability and high in cost performance. A production process is environmentally friendly and free of waste water, waste gas and industrial residues and accords with environment-friendly and sustainable development concepts. The early-strength polycarboxylate superplasticizer is widely applicable to various concrete engineering construction with early strength requirements and especially applicable to production and manufacturing of precast concrete components and has a promising application prospect.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a high-performance polycarboxylate concrete water-reducer with an early-strength function. Background technique [0002] With the development of construction technology, the trend of high-performance concrete is becoming more and more obvious. Due to the great advantages of water reducing agent in improving concrete workability, strength and durability, it has become an indispensable fifth component in concrete. The third generation of concrete water reducer polycarboxylate water reducer has been widely accepted by the market because of its unique advantages of low dosage, high water reduction and environmental protection, and has become the mainstream of commercial concrete water reducer. In the water reducer market occupied the largest market share. However, due to the vast territory of our country, the geographical and climatic conditions of various ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F220/56C08F222/22C08F222/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/0059C04B2103/302C08F283/065C08F290/062C08F220/06
Inventor 何辉蒋亚清徐中华陶小福邱阿莲
Owner 南京建高新材料科技有限公司
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