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Preparation method for cement water-reducing agent

A water-reducing agent and cement technology, which is applied in the field of preparation of cement water-reducing agent, can solve the problems of complex production process, low production efficiency, difficult implementation of technological process, etc., so as to overcome many processes, improve work efficiency, and improve single-pass conversion. rate and the effect of product yield

Inactive Publication Date: 2016-06-08
QINGDAO SHOUTAI AGRI SCI & TECH CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In the current preparation process of cement superplasticizer, the technological process is not easy to implement, the purity of the produced cement superplasticizer is low, the single pass conversion rate of reactants is low, the production process is complicated, the production efficiency is low and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] The preparation method of the cement water reducing agent of the present embodiment may further comprise the steps:

[0014] (1) Sulfonation: first add phenanthrene slag into the reaction kettle according to the proportion of ingredients, heat up the temperature, start stirring after the phenanthrene slag melts, slowly add concentrated sulfuric acid within 40 minutes at 100°C, and then maintain the reaction temperature at 130°C, The sulfonation reaction was 3 hours, and the sulfonation was completed;

[0015] (2) Hydrolysis and then sulfonation: cool down to 100°C, add water at a molar ratio of Phoebe water of 1:3.22, hydrolyze for 40 minutes, then heat up to 155°C, and then sulfonate for 40 minutes;

[0016] (3) Condensation: After resulfonation, cool down to 80°C, within 50 minutes, slowly add formaldehyde solution with a mass percentage of 37%, in order to make the condensation reaction mild and prevent implosion, in the formaldehyde solution The ratio is 1:14.6, an...

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PUM

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Abstract

The invention discloses a preparation method for a cement water-reducing agent. The preparation method comprises the following synthetic process: adding raw materials, i.e., waste residues, sulfuric acid, formaldehyde, and ethylenediamine or urea into a reaction vessel capable of stirring, wherein a mol ratio of the waste residues to sulfuric acid to formaldehyde to ethylenediamine or urea is 1: (1.5-3.5): (0.6-1.1): (0.009-0.02), and carrying out sulfonation, hydrolyzation and sulfonation, condensation, neutralization, and recondensation so as to obtain the cement water-reducing agent. The preparation method provided by the invention utilizes the waste residues as raw materials, so the problems of high water-reducing agent synthesizing cost and pollution of industrial waste residues to the environment are solved; meanwhile, the synthetic process is improved, so product performances are improved; the synthesized water-reducing agent has the advantages of high water-reducing rate, less usage amount, large fluidity and good mixability; and mechanical property and durability of cement are improved. The water-reducing agent meets national standard GB8076-1997 of concrete admixtures. The cement water-reducing agent produced by using the method provided by the invention is applicable to concrete engineering like industrial and civil building, road engineering, water-power engineering, prefabricated parts and cement products.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a preparation method of a cement water reducer. Background technique [0002] The preparation process of cement superplasticizer includes at least basic processes such as sulfonation, condensation adjustment, hydrolysis, and stirring. In the current preparation process of cement superplasticizer, the technological process is not easy to implement, the purity of the produced cement superplasticizer is low, the single-pass conversion rate of reactants is low, the production process is complicated, the production efficiency is low, and the cost is high. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a method for preparing a cement water-reducer. The present invention not only has a simple production process and improves work efficienc...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B103/30
Inventor 张晶
Owner QINGDAO SHOUTAI AGRI SCI & TECH CO LTD