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A kind of preparation method of shrinkage-reducing viscosity-reducing polycarboxylate plasticizer

A technology of viscous polycarboxylic acid and plasticizer, which is applied in the field of construction admixtures, can solve the problems of accelerating the deterioration process of concrete, reducing strength, and durability of steel bar corrosion, so as to control the hydrolysis rate of ester groups, reduce viscosity, and reduce concrete crack effect

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

AI Technical Summary

Problems solved by technology

Shrinkage causes cracks inside the concrete, which not only reduces its strength, but also accelerates the deterioration process of the concrete and increases the passage of other harmful substances into the interior of the concrete, which easily causes durability problems such as steel bar corrosion and alkali-aggregate reaction.

Method used

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  • A kind of preparation method of shrinkage-reducing viscosity-reducing polycarboxylate plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Copolymerization reaction: Add 200.00g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2000 and 100.00g of water into the reactor for stirring. Aqueous sodium persulfate solution (wherein 1.00 g of sodium persulfate, 20.00 g of water), an aqueous solution of dichotoma (1.00 g of dibasicum, 20.00 g of water), aqueous solution of mercaptoethanol (0.80 g of mercaptoethanol, 20.00 g of water) were added dropwise in the reaction kettle. 20.00 g), ethyl 2-amino-4-methyl-5-phospho-3-pentenoate, methyl 3-trimethylsiloxy-2-butenoate, methyl methacrylate and acrylic acid in water (In which 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester 8.00g, 3-trimethylsiloxy-2-butenoic acid methyl ester 2.00g, methyl methacrylate 10.00g g, acrylic acid 26.00g, water 40.00g) reacted, the time for dropping was 2.0h, and after the dropwise addition was completed, it was incubated for 3.0h to obtain a copolymerized product;

[0020] (2) Neutralization reaction...

Embodiment 2

[0022] (1) Copolymerization reaction: Add 200.00g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2400 and 120.00g of water into the reactor for stirring. Add dropwise sodium persulfate aqueous solution (wherein sodium persulfate 1.60g, water 20.00g), sodium bisulfite aqueous solution (wherein sodium bisulfite 1.00g, water 20.00g), trisodium phosphate aqueous solution (wherein trisodium phosphate 0.90g, water 20.00g), 2-amino-4-methyl-5-phospho-3-pentenoic acid propyl ester, 1-methoxy-1-trimethylsiloxypropene, isooctyl methacrylate ester and methacrylic acid aqueous solution (including 2-amino-4-methyl-5-phospho-3-pentenoic acid propyl ester 10.00g, 1-methoxy-1-trimethylsiloxypropene 3.00g, methyl 13.00 g of isooctyl acrylate, 28.00 g of methacrylic acid, and 40.00 g of water) were reacted, and the dropwise addition time was 1.5 h. After the dropwise addition, the mixture was incubated for 2.0 h to obtain a copolymerized product;

[0023] (2) Neutrali...

Embodiment 3

[0025] (1) Copolymerization reaction: Add 200.00g of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 2800 and 180.00g of water into the reactor for stirring. Azodicyanovaleric acid (3.00g of azodicyanovaleric acid, 20.00g of water), aqueous solution of mercaptopropionic acid (1.20g of mercaptopropionic acid, 20.00g of water), 2-amino-4 -Propyl-5-phospho-3-pentenoic acid ethyl ester, allyloxytrimethylsilane, hydroxypropyl methacrylate and maleic anhydride aqueous solution (wherein 2-amino-4-propyl-5-phosphor-3 -Ethyl pentenoate 11.00g, allyloxytrimethylsilane 4.00g, hydroxypropyl methacrylate 15.00g, maleic anhydride 24.00g, water 40.00g) reacted, the time for adding was 1.0h, and the addition was completed After heat preservation for 3.0h, the copolymerized product was obtained;

[0026] (2) Neutralization reaction: adjust the pH of the copolymerized product prepared in step (1) to 5-7 with alkali to obtain the shrinkage-reducing and viscosity-reducing p...

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Abstract

The invention discloses a method for preparing shrinkage and viscosity reducing type polycarboxylic acid plasticizers. The method includes steps of (1), carrying out copolymerization reaction; (2), carrying out neutralization reaction. The method has the advantages that copolymerization is carried out on 4-hydroxy butyl vinyl polyoxyethylene ether, chemical compounds A, unsaturated silicon-containing small monomers, unsaturated carboxylate ester and unsaturated carboxylic acid or unsaturated carboxylic acid anhydride small monomers to obtain the polycarboxylic acid plasticizers by the aid of the method; groups such as carboxyl, phosphate, amine, siloxy, ester and hydroxyl are introduced into molecular structures of the polycarboxylic acid plasticizers, and accordingly the polycarboxylic acid plasticizers are high in water-reducing rate and slump retaining property, good in contractility and low in sensitivity under the synergistic effects of the various groups.

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 and viscosity-reducing polycarboxylate plasticizer. Background technique [0002] Polycarboxylate superplasticizer has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. With the development of society and the advancement of science and technology, human beings continue to expand their own living space. People are constantly developing into the sky, the ground and the ocean, forming a trend that modern buildings tend to be more high-rise, lightweight and long-span. All of these require the continuous improvement of concrete technology and production technology. Compared with ordinary concrete, high-strength concrete has the adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F222/06C08F230/02C08F230/08C08F220/14C04B103/30
CPCC04B24/32C04B2103/302C08F283/065C08F220/06C08F222/06C08F230/02
Inventor 官梦芹郭鑫祺李祥河陈晓彬蒋卓君林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD