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Polycarboxylic acid superplasticizer and preparation method thereof

A technology of superplasticizer and polycarboxylic acid, which is applied in the field of building material concrete additives, can solve the problems of concrete slump bleeding, inability to pump, and coarse aggregate sinking, and achieve small loss over time and improve Bleeding and segregation, the effect of improving slump retention

Active Publication Date: 2021-02-23
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although polycarboxylate superplasticizers have many excellent properties, there are also some problems in the concrete pumping process, which brings a lot of trouble to the construction. For example, the pumped concrete prepared by polycarboxylate superplasticizers is After a long period of transportation to the construction site, it was found that the loss was too large to be pumped; for example, after the prepared concrete was placed for a period of time, the concrete slumped and bled, resulting in delamination and segregation of the concrete. Sink, mortar or clean slurry float

Method used

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  • Polycarboxylic acid superplasticizer and preparation method thereof
  • Polycarboxylic acid superplasticizer and preparation method thereof
  • Polycarboxylic acid superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049](1) Acylation reaction: 42.0g maleic anhydride and 36.0g acrylic acid, 40.0g compound A1, 0.6g hydroquinone, under nitrogen protection, after adding 1.2g p-toluenesulfonic acid, slowly warming up to 60°C, constant temperature 6h, the temperature was lowered to obtain the first mixture containing the acylated product and the unreacted unsaturated mixed acid.

[0050] (2) Esterification reaction: 55.0 g of compound B2 and 35.0 g of unsaturated alcohol C1 were mixed, and under nitrogen protection, the temperature was raised to 90° C., 0.8 g of periodic acid was added, and the reaction was incubated for 6 h. The method of water removes water, and after the reaction is completed, the temperature is lowered to room temperature to obtain a second mixture containing the esterified product and the unreacted unsaturated alcohol C.

[0051] (3) Copolymerization reaction: 10.0 g of the first mixture, 10.0 g of the second mixture, 100.0 g of prenol polyoxyethylene polyoxypropylene et...

Embodiment 2

[0054] (1) Acylation reaction: 43.0g of itaconic anhydride, 15.0g of acrylic acid, 66.1g of compound A2, 0.7g of phenothiazine, under nitrogen protection, after adding 1.5g of ethylsulfonic acid, slowly warmed up to 70~80℃, The temperature was kept constant for 5 h, and the temperature was lowered after the reaction to obtain the first mixture containing the acylated product and the unreacted unsaturated mixed acid.

[0055] (2) Esterification reaction: 49.5g of monomer B2 and 23.3.0g of unsaturated alcohol C2 were mixed, and under nitrogen protection, the temperature was raised to 95°C, 1.0g of dinitrobenzoic acid was added, and the reaction was incubated for 4h. Or the water is removed by the method of passing nitrogen and water, and after the reaction is completed, it is lowered to room temperature to obtain a second mixture containing the esterified product and unreacted.

[0056] (3) Copolymerization reaction: 5.0 g of the first mixture, 20.0 g of the second mixture, 100....

Embodiment 3

[0059] (1) Acylation preparation: 18.0g of succinic anhydride, 72.0g of acrylic acid, 45.0g of compound A3, 1.1g of diphenylamine, under nitrogen protection, after adding 1.5g of ethylsulfonic acid, slowly warming up to 90 ° C, constant temperature for 3h, the reaction The cooling is completed to obtain the first mixture containing the acylated product and the unreacted unsaturated mixed acid.

[0060] (2) Esterification reaction: 45.0g of monomer B2 and 32.0g of unsaturated alcohol C3 were mixed, and under nitrogen protection, the temperature was raised to 110°C, 0.4g of periodic acid was added, and the reaction was incubated for 3h, during which vacuum or nitrogen was used. The method with water removes water, and after the reaction is completed, it is lowered to room temperature to obtain a second mixture containing the esterified product and unreacted.

[0061] (3) Copolymerization reaction: 15.0g of the first mixture, 5.0g of the second mixture, 100.0g of methallyl polyox...

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Abstract

The invention relates to the technical field of building material concrete additives, in particular to a polycarboxylic acid superplasticizer and a preparation method thereof. The preparation method comprises the following steps of: adding a first mixture, a second mixture, an unsaturated polyether monomer, unsaturated carboxylic ester, an oxidizing agent and water into a reaction container, performing mixing, respectively adding a reducing agent and a molecular weight regulator solution into the reaction container, carrying out normal-temperature reaction, keeping the temperature for a periodof time, and regulating the pH value to 6-7, thereby obtaining the polycarboxylic acid superplasticizer. Specifically, the first mixture comprises an acylation product containing a benzene ring and sulfonamide and an unsaturated mixed acid; the second mixture includes an esterification product containing a polyhydroxy group and an unsaturated alcohol. The polycarboxylic acid superplasticizer is applied to concrete, the workability of the concrete can be obviously improved, the prepared concrete is small in loss over time, the workability of the concrete can be improved, the bleeding segregation condition of the concrete can be improved, the concrete has pumpability, and meanwhile the slump loss resistance of the concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of building material concrete additives, in particular to a polycarboxylic acid superplasticizer and a preparation method thereof. Background technique [0002] In recent years, with the development of building modernization, the pumped concrete technology has made great progress, and it has also driven the technological progress of the pumped concrete construction technology. Concrete pump is a new type of equipment that conveys concrete along the pipeline under pressure. It can continuously complete horizontal and vertical transportation at one time. It can also be poured with distribution equipment. It has large capacity for conveying concrete, high speed, high efficiency, and shortened construction period , the characteristics of reducing costs, while reducing the labor intensity of workers. Especially for the construction of high-rise buildings with a large amount of concrete, it can show its advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/58C08F222/38C08F218/12C08F220/18C04B24/16C04B103/32
CPCC08F283/065C04B24/165C04B2103/32C08F222/385C08F218/12Y02W30/91
Inventor 赖华珍方云辉林艳梅赖广兴柯余良麻秀星郭元强林添兴杨浩蔡静
Owner KZJ NEW MATERIALS GROUP CO LTD
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