A kind of preparation method of concrete fluidity stabilizer

A fluidity and concrete technology, applied in the field of building admixtures, can solve the problems of low initial fluidity of concrete, unfavorable production control, and reduced fluidity, and achieve high double bond retention rate, which is beneficial to construction and moderate hydrolysis rate. Effect

Active Publication Date: 2020-12-29
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slump protection principle of this process relies on the hydrolysis release of cross-linked macromonomers. The initial fluidity of concrete is very small, and the fluidity becomes larger after hydrolysis, and the fluidity becomes smaller as the hydration progresses, which is not conducive to production control.

Method used

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  • A kind of preparation method of concrete fluidity stabilizer
  • A kind of preparation method of concrete fluidity stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Esterification: Mix 255.00g maleic anhydride, 80.00g p-hydroxybenzoic acid, 20.00g o-hydroxybenzoic acid, 1.00g hydroquinone and 2.70g phenothiazine, and heat up to 65 ℃, then add 1.00g of periodic acid and 2.00g of dinitrobenzoic acid, heat preservation reaction for 3.0h, during which the water is removed by vacuuming or nitrogen with water, and after the reaction is completed, it is lowered to room temperature, and the product containing esterification and a first mixture of unreacted maleic anhydride;

[0024] (2) Monomer blending: Mix 2.00 g of the first mixture prepared in step (1), 2.80 g of sodium styrene sulfonate, and 100.00 g of APEG with a molecular weight of 2400, and add 70.00 g of water to dissolve it to obtain a copolymer monomer mixture solution;

[0025] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, hydrogen peroxide aqueous solution (wherein hydrogen peroxide 1.00g, water 20.00g), ascorbic acid aqueous solution (wh...

Embodiment 2

[0028] (1) Esterification reaction: Mix 115.00g acrylic acid, 94.00g methacrylic acid, 45.00g o-hydroxybenzoic acid, 55.00g o-hydroxymethylbenzoic acid, 2.00g hydroquinone and 2.00g diphenylamine, under nitrogen protection 2.00g of dinitrobenzoic acid and 1.00g of ethylenediaminetetraacetic acid were added, and the reaction was kept for 2 hours. During this period, the water was removed by vacuuming or nitrogen with water. After the reaction was completed, the temperature was lowered to room temperature. Obtain the first mixture that contains esterification product and unreacted acrylic acid, methacrylic acid;

[0029] (2) Monomer blending: 4.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate, 2.60 g of sodium vinyl sulfonate and 100.00 g of TPEG with a molecular weight of 2400 were mixed, and 70.00 g of g of water to dissolve it to obtain a comonomer mixture solution;

[0030] (3) Copolymerization reaction: the above-mentioned comonomer mixture ...

Embodiment 3

[0033] (1) Esterification reaction: Mix 108.00g acrylic acid, 232.00g fumaric acid, 50.00g p-hydroxyphenylacetic acid, 50.00g p-hydroxymethylbenzoic acid, 2.00g hydroquinone and 2.00g diphenylamine, under nitrogen protection 2.00g of periodic acid and 0.90g of ethylenediaminetetraacetic acid were added, and the reaction was kept for 1.0h. During this period, the water was removed by vacuuming or nitrogen with water. After the reaction was completed, it was lowered to room temperature to obtain A first mixture containing esterification products and unreacted acrylic acid and fumaric acid;

[0034](2) Monomer blending: Mix 5.00 g of the first mixture prepared in step (1), 2.00 g of sodium styrene sulfonate, 2.20 g of sodium methacrylate sulfonate, and 100.00 g of HPEG with a molecular weight of 2400, and add 70.00 g of water to dissolve it to obtain a comonomer mixture solution;

[0035] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, azodicyanova...

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Abstract

The invention discloses a preparation method of a concrete flowability stabilizer. The preparation method comprises the following steps: (1) esterification reaction; (2) monomer blending; (3) copolymerization reaction; (4) neutralization reaction. According to the preparation method, unsaturated monomers containing benzene rings, carboxylic acid groups and ester groups are prepared from unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and a specific compound A through esterification, then the unsaturated monomers and unsaturated sulfonate act on copolymerization synthesis of polycarboxylic acid, molecular structures containing the benzene rings, the ester groups, sulfonic acid groups and the carboxylic acid groups are introduced simultaneously into molecular chain structures of polycarboxylic acid, and by means of introduction of the carboxylic acid groups with an electrostatic repulsion effect, the sulfonic acid groups as well as polyether side chains and the benzene rings with steric hindrance, the product has higher initial water reducing rate.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a concrete fluidity stabilizer. Background technique [0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. [0003] With the rapid increase in the use of polycarboxylate superplasticizers and the continuous expansion of the scope of use, the fluidity loss of admixtures and concrete caused by factors such as differences in cement performance and mud in sand and gravel has always plagued cement manufacturers and concrete manufacturers. Technical problems for construction units and admixture manufacturers. In order to solve this problem, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F222/06C08F212/14C08F220/06C08F228/02C08F222/02C04B24/16
CPCC04B24/165C04B2103/0079C08F283/065C08F212/14C08F220/06C08F222/06
Inventor 郭鑫祺蒋卓君官梦芹李祥河陈晓彬林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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