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Preparation method of high water retention type polycarboxylate superplasticizer

A water-retaining polycarboxylic acid technology, which is applied in the field of building materials, can solve the problems of low efficiency in the esterification process, and achieve the effects of high dispersion performance, slump retention and retardation, and cost reduction

Inactive Publication Date: 2019-04-26
ZHEJIANG KZJ NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method belongs to esterification and then polymerization to obtain an ester water-retaining polycarboxylate superplasticizer. The efficiency of the esterification process is low, and adding more polymerization inhibitors will easily affect the performance of the target product.

Method used

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  • Preparation method of high water retention type polycarboxylate superplasticizer

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Comparison scheme
Effect test

Embodiment 1

[0024] 1) In parts by mass: 100 parts of acrylic acid, 5 parts of itaconic acid, 5 parts of maleic anhydride and 400 parts of water were mixed, stirred, dissolved and reacted at 75°C, followed by adding 0.8 parts of hydrogen peroxide, and then dripping 300 parts of acrylic acid , 10 parts of hydroxyethyl acrylate, 1.0 parts of 3-mercaptopropionic acid, 0.5 parts of L-ascorbic acid and 200 parts of water are added dropwise in 2.0 hours. part of toluoyloxy-2,2,6,6-tetramethylpiperidine to obtain a main chain copolymer intermediate, wherein the molecular weight of the main chain copolymer intermediate is 5000-30000;

[0025] 2) in parts by mass: 70 parts of molecular weight are 750 polyethylene glycol monomethyl ether, 10 parts of glucose, 35 parts of main chain copolymer intermediate and 0.1 part of concentrated sulfuric acid prepared in step 1) are mixed, and the temperature is raised to 150°C, start stirring and vacuumize at the same time to react for 5 hours under a vacuum of...

Embodiment 2

[0027] 1) In parts by mass: 100 parts of acrylic acid, 5 parts of itaconic acid, 5 parts of maleic anhydride and 400 parts of water were mixed, stirred, dissolved and reacted at 75°C, followed by adding 0.8 parts of hydrogen peroxide, and then dripping 300 parts of acrylic acid , 10 parts of hydroxyethyl acrylate, 1.0 parts of 3-mercaptopropionic acid, 0.5 parts of L-ascorbic acid and 200 parts of water are added dropwise in 2.0 hours. part of toluoyloxy-2,2,6,6-tetramethylpiperidine to obtain a main chain copolymer intermediate, wherein the molecular weight of the main chain copolymer intermediate is 5000-30000;

[0028] 2) in parts by mass: 70 parts of molecular weight is 750 polyethylene glycol monomethyl ether, 20 parts of glucose, 35 parts of main chain copolymer intermediate and 0.15 part of concentrated sulfuric acid prepared in step 1) are mixed, and the temperature is raised to 155°C, start stirring and vacuumize at the same time to react for 6 hours under a vacuum of...

Embodiment 3

[0030] 1) In parts by mass: 100 parts of acrylic acid, 10 parts of itaconic acid, 10 parts of maleic anhydride and 400 parts of water were mixed, stirred, dissolved and reacted at 75°C, followed by adding 0.8 parts of hydrogen peroxide, and then dripping 270 parts of acrylic acid , 20 parts of hydroxyethyl acrylate, 1.0 part of 3-mercaptopropionic acid, 0.5 part of L-ascorbic acid and 200 parts of water, and the mixed solution was added dropwise in 2.0 hours. part of toluoyloxy-2,2,6,6-tetramethylpiperidine to obtain a main chain copolymer intermediate, wherein the molecular weight of the main chain copolymer intermediate is 5000-30000;

[0031] 2) In parts by mass: 70 parts of polyethylene glycol monomethyl ether with a molecular weight of 750, 20 parts of glucose, 35 parts of the main chain copolymer intermediate prepared in step 1) and 0.2 part of p-toluenesulfonic acid were mixed, Raise the temperature to 150°C, start stirring and vacuumize at the same time to react for 5 ...

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Abstract

The invention discloses a preparation method of a high water retention type polycarboxylate superplasticizer. The method comprises the steps as follows: firstly, acrylic acid is mixed with other unsaturated acid, unsaturated acid ester and unsaturated acid anhydride, an oxidizing agent is added, a mixed solution of an unsaturated monomer, a chain transfer agent, a reducing agent and water is dropwise added at a certain temperature, a certain quantity of free radical quencher is added after a copolymerization reaction, a main chain copolymer intermediate is obtained, then, a certain amount of cheap glucose, ethylene glycol monomethyl ether and a catalyst are added for esterification grafting, and finally, the high water retention type polycarboxylate superplasticizer is prepared through neutralization. By molecular structure design, a synthesis method using first polymerization and then grafting esterification is adopted, polyhydroxyl glucose with excellent water retention performance is introduced for grafting esterification, the method is high in grafting plasticity, high in copolymerization degree and low in double bond damage rate, and the prepared polycarboxylate superplasticizer has the characteristics of excellent water retention performance, high dispersity, low cost, excellent slump loss resistance and retarding functions and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a preparation method of a high water retention polycarboxylate water reducer. Background technique [0002] In recent years, polycarboxylate superplasticizer has received more and more attention from the industry due to its excellent performance and environmental protection characteristics, and has also been rapidly developed and widely used. At present, ether polycarboxylate superplasticizers are mostly used in the domestic market, mainly because ether polycarboxylate superplasticizers have low dosage, good fluidity, controllable slump performance, simple synthesis process and green production process. Notable features such as environmental protection. However, in the actual use process, ether water reducers also have some shortcomings: such as high sensitivity to materials, poor adaptability, and insufficient water retention performance. Especially in the current s...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F220/06C08F222/02C08F222/06C08F220/20C04B24/28C04B103/30
CPCC04B24/28C04B2103/302C08F220/06C08G81/025C08F222/02C08F222/06C08F220/20
Inventor 曾贤华徐逸丹凤朱巧勇黄文耀张乐于飞宇
Owner ZHEJIANG KZJ NEW MATERIALS CO LTD
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