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Preparation method of powdery carboxylic acid water reducing agent

A technology of water reducer and powder, which is applied in the field of preparation of powdery polycarboxylate water reducer, which can solve the problems of polycarboxylate water reducer performance reduction, high viscosity of the reaction system, overheating, etc., and achieve high fluidity, Reduce the viscosity of the system and increase the effect of heat conduction

Active Publication Date: 2019-03-12
佳化化学(抚顺)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the excessive viscosity of the reaction system when the polycarboxylate superplasticizer is synthesized by bulk polymerization in the prior art, and local overheating or even explosion is easy to occur, resulting in the performance of the polycarboxylate superplasticizer. Reduced defects

Method used

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  • Preparation method of powdery carboxylic acid water reducing agent
  • Preparation method of powdery carboxylic acid water reducing agent

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Effect test

Embodiment 1

[0040] This embodiment provides a preparation method of powdery polycarboxylate water reducer, which specifically includes the following steps:

[0041](1) drop into the isobutylene alcohol polyoxyethylene ether (SPEG, molecular weight: 2400) of 1 mass part in the reactor, the deionized water of 0.01 mass part, replace the air in the reactor with nitrogen; Raise the temperature in the reactor, make The temperature of the kettle rises to 55°C to melt isobutylene alcohol polyoxyethylene ether;

[0042] (2) Add 0.5 parts by mass of cumene hydroperoxide to the melted isobutylene alcohol polyoxyethylene ether, then raise the temperature in the reactor to 115°C, then start to drop 0.05 parts by mass of acrylic acid and 0.1 parts by mass of Mixture of mercaptopropionic acid;

[0043] (3) Control the temperature in the reactor to be 115-120°C, and the pressure in the reactor to be less than 0.1MPa. Add the mixture of acrylic acid and mercaptopropionic acid dropwise within 2 hours; A...

Embodiment 2

[0046] This embodiment provides a preparation method of powdery polycarboxylate water reducer, which specifically includes the following steps:

[0047] (1) Add 0.3 parts by mass of methallyl polyoxyethylene ether (TPEG, molecular weight: 2400), 0.7 parts by mass of isobutylene alcohol polyoxyethylene ether (SPEG, molecular weight: 2400), 0.008 parts by mass deionized water, and replace the air in the reactor with nitrogen; increase the temperature in the reactor to make the temperature of the reactor rise to 45°C, and melt the methallyl polyoxyethylene ether and the isobutylene alcohol polyoxyethylene ether;

[0048] (2) Add 0.65 parts by mass of dicumyl peroxide to the molten methallyl polyoxyethylene ether and isobutenyl alcohol polyoxyethylene ether, then raise the temperature in the reactor to 80°C, and then start to drop The mixed solution of the methacrylic acid of 0.1 mass part and the mercaptoacetic acid of 0.15 mass part;

[0049] (3) Control the temperature in the ...

Embodiment 3

[0052] This embodiment provides a preparation method of powdery polycarboxylate water reducer, which specifically includes the following steps:

[0053] (1) drop into the allyl alcohol polyoxyethylene ether (APEG, molecular weight: 3000) of 1 mass part in the reactor, the deionized water of 0.012 mass part, replace the air in the reactor with nitrogen; Raise the temperature in the reactor, Raise the kettle temperature to 55°C to melt allyl alcohol polyoxyethylene ether;

[0054] (2) Add 0.45 parts by mass of lauryl peroxide to the molten allyl alcohol polyoxyethylene ether, then raise the temperature in the reactor to 70°C, then start to drop 0.15 parts by mass of maleic anhydride and 0.11 parts by mass The mixed solution of the mercaptopropionic acid of one part;

[0055] (3) Control the temperature in the reactor to 70-75°C, and the pressure in the reactor to <0.1MPa, and drop the mixture of maleic anhydride and mercaptopropionic acid within 2 hours; Lower heat preservatio...

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Abstract

The invention provides a preparation method of a powdery carboxylic acid water reducing agent. The preparation method includes the steps: (1) mixing a water reducing agent monomer and water, and heating and fusing mixture; (2) adding initiators, chain transfer agents and unsaturated carboxylic acid into a system fused in the step (1), performing mass polymerization reaction to generate a polycarboxylic acid water reducing agent precursor; (3) neutralizing and crushing the polycarboxylic acid water reducing agent precursor to prepare the powdery carboxylic acid water reducing agent. According the preparation method, water is added in the mass polymerization reaction, the water serves as a reactant to react with the water reducing agent monomer and the unsaturated carboxylic acid, the systemviscosity of the mass polymerization reaction is reduced, the powdery carboxylic acid water reducing agent with high performance is synthesized when effective generation of the mass polymerization reaction and generation of solid polycarboxylic acid water reducing agent are ensured, long-distance transportation of the water reducing agent is facilitated, transportation cost is reduced, and the application range of the polycarboxylic acid water reducing agent is widened, so that the water reducing agent is applicable to products such as dry-mixed mortar and high-performance concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a powdery polycarboxylate water reducer. Background technique [0002] Concrete has become the foundation of human life and is currently the most widely used building material. Concrete admixture is the fifth component in concrete besides cement, sand, stone and water, and plays a very important role in the application of high performance concrete. As a kind of concrete admixture, water reducing agent (also known as superplasticizer, Superplasticizer) can reduce mixing water consumption and improve concrete strength under the condition of concrete workability and cement dosage unchanged, and has become the field of concrete admixture Research hotspots and development priorities. The water reducing agent hinders or destroys the flocculation structure of cement particles through surface activity, complexation, electrostatic repulsio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F226/02C08F220/06C08F222/06C08F220/04C08F2/02C08F2/38C04B103/30
CPCC04B24/2605C04B24/2652C08F2/02C08F2/38C08F226/02C08F283/065C04B2103/302C08F220/06C08F222/06C08F220/04C04B28/02C04B2111/0075C08F216/1433C08F8/44C04B24/267C04B2103/32C08F228/02C08F226/06C08F20/06C08F22/06C08J3/12C08J2333/02C08J2337/00C08F216/12C08F226/04C08F222/02C08F216/04C08F216/08
Inventor 陈艳丹来科李玉博
Owner 佳化化学(抚顺)新材料有限公司
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