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Water reducing agent and preparation method thereof

A technology of water reducing agent and sulfonating agent, which is applied in the field of water reducing agent and its preparation, and can solve problems such as low production efficiency, long production cycle, and difficult temperature control

Inactive Publication Date: 2021-04-06
科之杰新材料集团河南有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a water reducer and its preparation method, aiming to overcome the disadvantages of long production cycle, low production efficiency and difficult temperature control in the existing preparation process of water reducer

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preparation example Construction

[0036] ginseng figure 1 , the invention provides a kind of preparation method of water reducing agent, it comprises the following steps:

[0037] Provide ketone compounds, aldehyde compounds, sulfonating agents, and catalysts, wherein the mass ratio of ketone compounds, aldehyde aqueous solutions, sulfonating agents, and catalysts is 100:260-300:95-130:15-25, In the aldehyde aqueous solution, the content of aldehyde compounds is 30-40%;

[0038] Dissolve 50-80% of the sulfonating agent in water, add an aqueous aldehyde solution, and stir for 5-10 minutes to obtain the first mixed solution;

[0039] Adding 50-80% of ketone compounds into the first mixed solution to carry out sulfonation reaction to obtain a pre-sulfonation solution;

[0040] Dissolve the remaining sulfonating agent and catalyst in water, and stir for 10-20 minutes to obtain the second mixed solution;

[0041] adding the remaining ketone compound into the second mixed solution, and stirring for 10-30 minutes ...

Embodiment 1

[0072] 1. Provide 50.0g of acetone, 141.0g of formaldehyde solution (formaldehyde content 37%), 58.5g of sodium bisulfite (97.5%), and 8.5g of sodium hydroxide;

[0073] 2. The preparation process is as follows:

[0074] Step 1: 35.9 g of sodium bisulfite is dissolved in 85.0 g of water, and 141.0 g of formaldehyde solution with a content of 37% is added to obtain the first mixed solution; the first mixed solution is cooled so that the temperature of the first mixed solution Decrease to below 32°C; add 35.0 g of acetone to the first mixed solution to obtain a pre-sulfonated solution;

[0075] Step 2: Add 22.6 g of sodium bisulfite, 8.5 g of sodium hydroxide, and 100.0 g of water in a four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir and dissolve to obtain the second mixed solution; The second mixed solution is cooled so that the temperature of the second mixed solution is less than 40° C.; 15.0 g of acetone is added to the second mixed ...

Embodiment 2

[0079] 1. Provide 50.0g of acetone, 151.0g of formaldehyde solution (formaldehyde content 37%), 53.7g of sodium metabisulfite (100%), and 8.5g of sodium hydroxide;

[0080] 2. The preparation process is as follows:

[0081] Step 1: dissolving 32.7g of sodium metabisulfite in 89.8g of water, adding 151.0g of formaldehyde solution with a content of 37%, to obtain the first mixed solution; cooling the first mixed solution so that the temperature of the first mixed solution is reduced to Below 32°C; add 36.0 g of acetone to the first mixed solution to obtain a pre-sulfonated solution;

[0082] Step 2: Add 21 g of sodium metabisulfite, 8.5 g of sodium hydroxide, and 90.0 g of water into a four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to dissolve to obtain the second mixed solution; for the second mixed solution Perform cooling treatment so that the temperature of the second mixed solution is less than 40° C.; add 14.0 g of acetone to the...

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Abstract

The invention provides a water reducing agent and a preparation method thereof. The preparation method comprises the following steps: providing a ketone compound, an aldehyde compound, a sulfonating agent and a catalyst, wherein the mass ratio of the ketone compound to the aldehyde aqueous solution to the sulfonating agent to the catalyst is 100: (260-300): (95-130): (15-25), and the content of the aldehyde compound in the aldehyde aqueous solution is 30%-40%; dissolving 50-80% of a sulfonating agent in water, and adding an aldehyde aqueous solution to obtain a first mixed solution; adding 50-80% of ketone compounds into the first mixed solution, and carrying out sulfonation reaction to obtain a pre-sulfonation solution; dissolving the rest sulfonating agent and catalyst in water to obtain a second mixed solution; adding the rest ketone compounds into the second mixed solution to obtain a third mixed solution; and dropwise adding a pre-sulfonation solution into the third mixed solution, and carrying out condensation reaction to obtain the water reducing agent. The preparation method of the water reducing agent has the advantages of controllable temperature, short production period and high production efficiency.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a water reducer and a preparation method thereof. Background technique [0002] In the modern construction industry, there are various building materials, and concrete, as one of the most widely used synthetic building materials in the world, occupies a very important position in the application of building materials. After entering the 21st century, the construction industry has developed rapidly, and the performance requirements for building materials, especially concrete, are getting higher and higher, such as stability, construction performance and durability. As one of the important components in concrete, the water reducing agent in the admixture plays a very important role in the concrete material. Water reducing agent can greatly reduce the mixing water consumption of concrete without affecting the workability and working performance of concrete, and also con...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
CPCC04B24/166C04B2103/302
Inventor 杜可禄刘尊玉李祥河
Owner 科之杰新材料集团河南有限公司
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