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A preparation method of shrinkage-reducing concrete fluidity stabilizer

A concrete and fluidity technology, which is applied in the field of preparation of shrinkage-reducing concrete fluidity stabilizers, can solve problems such as difficulty in meeting high-performance water-reducing agents, poor concrete stability, and reduced shrinkage, and achieve excellent initial water-reducing efficiency, reduce concrete cracks, and reduce production energy consumption

Active Publication Date: 2020-07-03
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there are mainly three types of research on shrinkage-reducing polycarboxylate water-reducers: one is an acrylic shrinkage-reducing agent with a certain water-reducing function, which still belongs to the field of shrinkage-reducing agents. The disadvantage is that the rate of water-reducing agents is too small to meet high performance. Superplasticizer requirements, and the dosage is too large
The second type is polycarboxylate water reducer with relatively small shrinkage of concrete or mortar after mixing. Since no shrinkage reducing group is introduced from the molecular structure, the molecular structure of this water reducer is different from that of ordinary polycarboxylate water reducer. The molecular structure is similar, and the amount to reduce shrinkage is also limited
The third type is a polycarboxylate water reducer with good shrinkage reduction function. This water reducer introduces shrinkage reduction groups from the molecular structure, so it has a good shrinkage reduction function while having a high water reduction rate. The disadvantage is that the concrete poor stability

Method used

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  • A preparation method of shrinkage-reducing concrete fluidity stabilizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Acylation esterification reaction: 255.00g maleic anhydride, 30.00g monoethanolamine, 117.00g diethylene glycol butyl ether, 70.00g p-hydroxybenzoic acid, 30.00g o-hydroxybenzoic acid, 1.00g hydroquinone Mix with 5.00g of phenothiazine, raise the temperature to 65°C under the protection of nitrogen, then add 5.00g of periodic acid and 2.00g of dinitrobenzoic acid, and keep it warm for 3.0h, during which time, use vacuum or nitrogen with water Water is removed, and after the reaction is finished, it is cooled to room temperature to obtain the first mixture containing acylated esterification product and unreacted maleic anhydride;

[0024] (2) Monomer blending: Mix 7.00 g of the first mixture prepared in step (1), 2.00 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 s...

Embodiment 2

[0028] (1) Acylation esterification reaction: 115.00g acrylic acid, 86.00g methacrylic acid, 55.00g diethanolamine, 125.00g dipropylene glycol butyl ether, 55.00g o-hydroxybenzoic acid, 45.00g o-hydroxymethylbenzoic acid, 2.00g Mix hydroquinone and 1.00g of diphenylamine, under the protection of nitrogen, heat up to 72°C, then add 2.00g of dinitrobenzoic acid and 3.00g of ethylenediaminetetraacetic acid, keep warm for 2 hours, during which time use vacuum or nitrogen The water-carrying method is used to remove water, and after the reaction is completed, it is cooled to room temperature to obtain the first mixture containing acylated esterification product and unreacted acrylic acid and methacrylic acid;

[0029](2) Monomer blending: Mix 8.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate, 2.00 g of sodium vinyl sulfonate and 100.00 g of TPEG with a molecular weight of 2400, and add 70.00 g of g of water to dissolve it to obtain a comonomer mixtur...

Embodiment 3

[0033] (1) Acylation esterification reaction: 108.00g acrylic acid, 162.00g fumaric acid, 90.00g triethanolamine, 125.00g dipropylene glycol butyl ether, 50.00g p-hydroxyphenylacetic acid, 50.00g p-hydroxymethylbenzoic acid, 2.00g Mix hydroquinone and 2.00g diphenylamine, under the protection of nitrogen, heat up to 75°C, then add 2.00g periodic acid and 0.90g ethylenediaminetetraacetic acid, keep warm for 1.0h, during this period use vacuum or nitrogen belt The method of water removes water, and after the reaction is finished, it is cooled to room temperature to obtain the first mixture containing acylated esterification product and unreacted acrylic acid and fumaric acid;

[0034] (2) Monomer blending: Mix 10.00 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] (...

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Abstract

The invention discloses a reducing type concrete fluidity stabilizer preparation method which comprises the following steps: (1) acylation and esterification reaction; (2) monomer alloying; (3) copolymerization reaction; (4) neutralization reaction. According to the preparation method disclosed by the invention, unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and alcohol amine, diethylene glycol monobutyl ether and / or dipropylene glycol monobutyl ether and compound A are acylated and esterified to prepare unsaturated monomer with an amide structure and an amino structure,unsaturated monomer with an alcohol ether structure and unsaturated monomer with a benzene ring and a carboxylic acid group at the same time; then the unsaturated monomers are copolymerized with excessive unsaturated carboxylic acid and carboxylic acid anhydride, unsaturated sulfonate and polyether macromonomer in acylation and esterification reaction; the monomers are guided into molecule structures, so that the molecule structures have the benzene rings, carboxylic acid groups, sulfonic acid groups, amide groups and amino groups at the same time; thus, a product has an excellent 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 shrinkage-reducing 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. Shrinkage-reducing polycarboxylate superplasticizer means that it has a high water-reducing rate and at the same time has the effect of reducing the drying shrinkage of hardened concrete. This multifunctional polycarboxylate superplasticizer has become another hot spot in domestic and foreign research. . [0003] In recent years, there are mainly three types of research on shrinkage-reducing polycarboxylate water-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F222/06C08F212/14C08F228/02C08F222/02C08F220/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F222/06C08F220/06C08F222/02
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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