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Preparation method for slow-release polycarboxylate water reducer

A slow-release polycarboxylic acid and water-reducing agent technology, applied in the field of building admixtures, to achieve excellent slump retention effect, excellent water-reducing and dispersing effect, and simple operation.

Inactive Publication Date: 2018-06-01
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prepare high-efficiency, long-term slump-preserving superplasticizers, many researchers have done a lot of research and exploration, but for different ground materials, slump-preserving polycarboxylate superplasticizers also have adaptability problems. Therefore, it is of great significance to develop a slump-retaining polycarboxylate superplasticizer with excellent slump-retaining properties.

Method used

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  • Preparation method for slow-release polycarboxylate water reducer
  • Preparation method for slow-release polycarboxylate water reducer
  • Preparation method for slow-release polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 178g of diethyltoluenediamine, 216 acrylic acid, and 4.5g of 2,4-dimethyl-6-tert-butylphenol into the reaction kettle, under the protection of nitrogen, the microwave is heated to 70°C, and 2.0g is added Solid phosphoric acid and 1.5g ferric sulfate, heated to 115°C, kept for 3 hours for reaction, during which time the water was removed by nitrogen and water, after the reaction, it was cooled to room temperature to obtain the acylated product;

[0023] (2) Add 200g of isopentenyl polyoxyethylene ether into the reaction kettle, microwave heating to 60℃, add 1.4g of dibutyltin phthalate and stir for 8-12min, then add 3g of acrylic acid and 0.7g of liquid caustic at once ;

[0024] (3) Add dropwise a mixture of 6g of acylated product obtained in step (1) and 2g of bis(2,4-dichlorobenzoyl) peroxide to the material obtained in step (2), while adding 4g of hydroxyethyl acrylate A mixture of 16g ​​acrylic acid and 1.5g n-dodecyl mercaptan acetate. The dripping time is 1h. ...

Embodiment 2

[0027] (1) Add 178 diethyl toluene diamine, 344 g methacrylic acid, and 5 g 4-hydroxy piperidinol oxygen radicals into the reaction kettle. Under the protection of nitrogen, the temperature is raised to 70°C by microwave, and 3.0 g solid phosphoric acid and 0.9 Ferric sulfate, heated to 120°C, kept for 3 hours for reaction, during which the water was removed by blowing nitrogen with water, and after the reaction, the temperature was reduced to room temperature to obtain the acylated product;

[0028] (2) Add 200g of methallyl polyoxyethylene ether to the reaction kettle, heat to 60℃ in microwave, add 3g of dibutyltin phthalate and stir for 8-12min, add 5g of acrylic acid and 1.3g of liquid caustic soda ;

[0029] (3) Add dropwise a mixture of 6g of acylated product obtained in step (1) and 1.17g of dioctanoyl peroxide to the material obtained in step (2), while adding 3g of hydroxyethyl acrylate, 18g of acrylic acid and 2.0g of acetic acid. For the mixture of n-dodecyl mercaptan e...

Embodiment 3

[0032] (1) Add 178g diethyltoluenediamine, 258g methacrylic acid, 108g acrylic acid, 3.5g 4-hydroxypiperidinol oxygen radical and 1.5g 2,4-dimethyl-6-tert-butylphenol to the reactor Inside, under the protection of nitrogen, the microwave is heated to 70℃, 3.0g solid phosphoric acid and 0.5g antimony trioxide are added, the temperature is raised to 120℃, and the reaction is kept for 3h. During the period, the water is removed by nitrogen and water. To room temperature to obtain the acylated product;

[0033] (2) Add 200g of methallyl polyoxyethylene ether into the reaction kettle, microwave heating to 60°C, add 2.5g of tetraethyleneimine and stir for 8-12min, add 4g of acrylic acid and 1.1g of liquid caustic at once;

[0034] (3) Add dropwise 10 g of the acylated product obtained in step (1), 1.5 g of peroxide (3,5,5-trimethylhexanoic acid) and 1.1 g of dioctanoyl peroxide to the material obtained in step (2) Add 1g of hydroxyethyl acrylate, 2g of hydroxypropyl acrylate, 10g of acr...

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Abstract

The invention discloses a preparation method for slow-release polycarboxylate water reducer. An amidation method is adopted to introduce a benzene ring, an amido group and an acylamino group of a rigid structure, meanwhile, carboxyl and an ester group are contained, the polycarboxylate water reducer which is finally synthesized has an excellent water reduction dispersion effect and slump protection effect, and in addition, the polycarboxylate water reducer has high adaptation for different varieties of gel materials; a microwave heating method is adopted, and therefore, the slow-release polycarboxylate water reducer has the advantages of high heating speed, simpleness in operation, high automation control accuracy, cleanness and no pollution; the polycarboxylate water reducer synthesized with a bulk polymerization method does not contain organic solvent which pollutes environment, is high in molecular structure controllability and is environmentally friendly and pollution-free.

Description

Technical field [0001] The invention belongs to the technical field of building admixtures, and specifically relates to a preparation method of a slow-release polycarboxylic acid water reducing agent. Background technique [0002] Polycarboxylate water-reducing agent is a high-performance water-reducing agent, called the third-generation water-reducing agent. It has good dispersion performance, high water-reducing rate, strong slump retention ability, and green environmental protection. People in the industry have paid wide attention, and have been widely used in major and key projects such as railways, highways, bridges, tunnels, hydropower, seaports, airports, wharves, and civilians, and have played an important role. [0003] With the application of polycarboxylic acid water reducer in engineering, some shortcomings have appeared, such as insufficient slump retention under high temperature environment; strong temperature sensitivity, the same polycarboxylic acid water reducer is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F222/38C08F220/20C08F2/38C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F283/065C08F220/06C08F222/385C08F220/20
Inventor 陈小路方云辉柯余良赖华珍赖广兴
Owner KZJ NEW MATERIALS GROUP CO LTD
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