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A kind of preparation method of powdery carboxylic acid water reducing agent

A water-reducing agent and powdery technology, which is applied in the field of preparation of powdered polycarboxylate water-reducing agent, can solve the problems of reduced performance of polycarboxylate water-reducing agent, high viscosity of the reaction system, and explosive polymerization, and achieves an increase in the amount of pure pulp. Fluidity, increase dispersion, avoid the effect of bursting

Active Publication Date: 2022-03-08
佳化化学(抚顺)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of powdery carboxylic acid water reducing agent
  • A kind of preparation method of powdery carboxylic acid water reducing agent

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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 polycarboxylate water reducer, comprising the following steps: (1) mixing the water reducer monomer with water, and heating and melting; (2) melting to the step (1) Initiator, chain transfer agent and unsaturated carboxylic acid are added into the system, bulk polymerization reaction occurs, and polycarboxylate superplasticizer precursor is generated; (3) the polycarboxylate superplasticizer precursor is neutralized and pulverized , to prepare powdery polycarboxylate superplasticizer. In the above preparation method, water is added to the bulk polymerization, and water is used as a reactant to react with the water reducer monomer and unsaturated carboxylic acid to ensure the efficient occurrence of the bulk polymerization reaction and generate a solid polycarboxylate water reducer. The system viscosity of the polymerization reaction can be used to synthesize a powdery polycarboxylate superplasticizer with high performance; it is beneficial to the long-distance transportation of the superplasticizer and reduce transportation costs; and it expands the application range of the polycarboxylate superplasticizer to make water reducing The agent is suitable for dry-mixed mortar, high-efficiency concrete and other products.

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 Patents(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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