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Method for preparing dry powder polycarboxylate superplasticizer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of preparation of dry powder polycarboxylic acid water reducing agent, can solve problems such as performance reduction, and achieve the effects of low cost, convenient source and reduced energy consumption

Inactive Publication Date: 2016-07-20
南京友西科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a preparation method of dry powder polycarboxylate water reducer. The present invention reduces energy consumption and solves the problem of performance degradation caused by the existing production process

Method used

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  • Method for preparing dry powder polycarboxylate superplasticizer
  • Method for preparing dry powder polycarboxylate superplasticizer

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Experimental program
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Effect test

Embodiment 1

[0032] 8 tons of polycarboxylate mother liquor, the solid content is 65%, the temperature is 50 ℃, add 950Kg of sodium sulfate, stir to accelerate the dissolution of sodium sulfate, after standing, the system is layered, the upper layer is polycarboxylic acid, and the lower layer is aqueous solution of sodium sulfate , pump the upper layer of polycarboxylic acid into the vacuum drying system, the vacuum degree is 0.04-0.09MPa, and the moisture content of polycarboxylic acid particles is 0.8%. Reuse. Yuanming powder aqueous solution can also be used to compound early-strength superplasticizer products.

Embodiment 2

[0034] Synthesize 8 tons of polycarboxylic acid mother liquors, solid content is 75%, temperature is 40 ℃, add 750 kilograms of sodium sulfate, after stirring and standing, the system is layered, the upper layer is polycarboxylic acid, and the lower floor is aqueous solution of sodium sulfate, and then The upper layer of polycarboxylic acid is pumped into the vacuum drying system with a vacuum degree of 0.04-0.09MPa to obtain polycarboxylic acid particles with a moisture content of 0.7%. The polycarboxylic acid particles enter the crushing system for granulation. use.

Embodiment 3

[0036] Synthesize 6 tons of polycarboxylic acid mother liquor, the solid content is 75%, the temperature is 40 ℃, add 1.2 tons of sodium bicarbonate, after stirring and standing, the system is layered, the upper layer is polycarboxylic acid, the lower layer is sodium bicarbonate aqueous solution, and then the upper layer polycarboxylate The acid is pumped into a vacuum drying system with a vacuum degree of 0.04-0.09 MPa to obtain polycarboxylic acid particles with a water content of 0.75%. The polycarboxylic acid particles enter the crushing system for granulation, and the sodium bicarbonate solution enters the evaporation system for recycling.

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Abstract

The invention discloses a method for preparing a dry powder polycarboxylate superplasticizer. The method comprises the steps of 1, taking polycarboxylic acid mother solution with the solid content of 65-80%; 2, adding an additive to the polycarboxylic acid mother solution for dehydration with the extraction method; 3, conducting vacuum dehydration on the solution obtained in the step 2, so that the dry powder polycarboxylate superplasticizer is obtained. Anhydrous sodium sulphate aqueous solution separated out in the process can be recycled after concentration and drying. Dry powder polycarboxylate is dried through spraying currently, operation cost is high, however, by the adoption of the method, drying cost can be reduced by about 30% according to preliminary calculation, and energy consumption can be reduced greatly.

Description

technical field [0001] The invention relates to a preparation method of a dry powder polycarboxylate water reducer, which belongs to the field of high-efficiency water reducer manufacture for civil engineering concrete. Background technique [0002] Polycarboxylate superplasticizer is a representative of high-performance superplasticizer, and it is an indispensable and important component material for preparing high-strength and high-performance concrete. At present, polycarboxylate water is mainly used in the market, and the solid content is generally 25-40%. For long-distance transportation, the transportation cost is relatively high, so the produced polycarboxylate water is usually processed into dry powder, and then used again. The polycarboxylate dry powder superplasticizer is dissolved in water and reconstituted into a water agent before use. [0003] The production of polycarboxylate high-efficiency water reducer is inseparable from the important medium-water, so the...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B103/30
CPCC04B24/24C04B2103/302
Inventor 王晓芳黄雪段周玉鹿立云盛思仲叶铭勋
Owner 南京友西科技集团股份有限公司
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