Preparation method of low air-entraining type solid polycarboxylic acid water reducing agent

A technology of polycarboxylic acid and water reducer, which is applied in the field of construction admixtures, can solve the problems of reducing concrete strength and durability, high air content, and unstable compound mixture, and achieve enhanced durability, high automation control precision, The effect of strong controllability of molecular structure

Active Publication Date: 2018-06-22
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polycarboxylate water-reducing agents have strong air-entraining properties, which will lead to high air content in engineering applications, which will reduce the strength and durability of concrete. However, due to the compatibility of conventional defoamers in water, the compounded mixture is unstable

Method used

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  • Preparation method of low air-entraining type solid polycarboxylic acid water reducing agent
  • Preparation method of low air-entraining type solid polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 178g of diethyltoluenediamine, 294g of maleic anhydride, 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 added 2.0g solid phosphoric acid and 1.5g iron sulfate, heated to 120℃, kept for 2h, then added 400g of polyetheramine, kept keeping the reaction for 2h, during which time the water was removed by nitrogen and water, after the reaction, the temperature was reduced to room temperature. Unsaturated acid diacylation product;

[0022] (2) Add 200g of ester polyether monomer MPEGMAn to the reaction kettle, heat it to 60°C in microwave, add 2.0g of dibutyltin phthalate and stir for 10min, add 5g of maleic anhydride and 1.5 of liquid caustic at one time;

[0023] (3) Add dropwise a mixture of 10 g of unsaturated acid bisacylation product obtained in step (1) and 2.3 g of bis(2,4-dichlorobenzoyl) peroxide to the material obtained in step (2), while dropping Add a mixture of 4g of ...

Embodiment 2

[0026] (1) Add 178g of diethyltoluenediamine, 348g of fumaric acid, and 6g of 4-hydroxypiperidinol oxygen radicals into the reaction kettle, under the protection of nitrogen, microwave the temperature to 70°C, add 3.5g of solid phosphoric acid and 1g Ferric sulfate, heated to 110℃, heat preservation reaction for 1.5h, then add 500g polyetheramine, continue heat preservation reaction for 3h, during which the water is removed by nitrogen and water, after the reaction, the temperature is reduced to room temperature to obtain unsaturated acid double acylation product;

[0027] (2) Add 200g of ester polyether monomer MPEGMAA to the reactor, heat it to 60°C in microwave, add 2.8g of dibutyltin phthalate and stir for 10min, then add 5g of fumaric acid and 1.5g of liquid caustic at once;

[0028] (3) Add dropwise the mixture of 6g unsaturated acid diacylation product obtained in step (1) and 2.5g dioctanoyl peroxide to the material obtained in step (2), while adding 2g hydroxypropyl acryla...

Embodiment 3

[0031] (1) Add 178g of diethyltoluenediamine, 490g of maleic anhydride, and 4g of 4-hydroxypiperidinol oxygen radicals into the reaction kettle. Under the protection of nitrogen, the temperature is raised to 70°C in a microwave oven, and 4g of solid phosphoric acid and 1g Antimony oxide was heated to 110°C, and the temperature was kept for 3 hours, then 600g of polyetheramine was added, and the reaction was continued for 1.5 hours. During this time, the water was removed by nitrogen and water. After the reaction, the temperature was reduced to room temperature to obtain the unsaturated acid diacyl Chemical product

[0032] (2) Add 100g of ester polyether monomer MPEGMAA and 100g of ester polyether monomer MPEGMAn into the reactor, microwave heating to 60℃, add 1.5g dibutyltin phthalate and 1.0g tetraethyleneimine and stir After 10 minutes, 4g maleic anhydride and 1.2g liquid caustic soda were added at once;

[0033] (3) To the material obtained in step (2), add dropwise 10 g of un...

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Abstract

The invention discloses a preparation method of a low air-entraining type solid polycarboxylic acid water reducing agent. A benzene ring with a rigid structure, an amide group and an ethylene oxide / epoxypropane polyether amine structure with a defoaming structure are introduced by an amidation method, so that the finally synthesized water reducing agent has good water-reducing, slump retaining andlow air-entraining effects and effectively enhances the durability of concrete; and the low air-entraining type solid polycarboxylic acid water reducing agent adopts a microwave heating method, and is high in heating speed, simple to operate, high in automatic control precision, clean and pollution-free. The polycarboxylic acid water reducing agent synthesized by a body polymerization method doesnot contain an organic solvent capable of polluting environment, has high molecular structure controllability and is environment-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 low-air-entrained solid polycarboxylic acid water reducing agent. Background technique [0002] In recent years, polycarboxylic acid-based water-reducing agents have been widely used in key projects such as high-speed railways, port terminals, hydropower dams, and municipal projects. These major projects have placed high requirements on the strength and durability of concrete. However, polycarboxylate water-reducing agents have strong air-entraining properties, which will lead to higher air content in engineering applications and reduce the strength and durability of concrete. The commonly used method to control air content is to compound water-reducing agents and defoamers. However, due to the compatibility of conventional defoamers in water, the compound mixture is unstable. [0003] Starting from the concept of molecular design, intro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/06C08F220/20C08F222/02C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/06C08F283/065C08F222/06C08F222/02
Inventor 陈小路方云辉柯余良赖华珍赖广兴李格丽
Owner KZJ NEW MATERIALS GROUP CO LTD
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