A kind of preparation method of monocyclic aromatic hydrocarbon type high-efficiency water reducer

A technology of high-efficiency water reducer and single-ring aromatic hydrocarbon, which is applied in the preparation of high-efficiency water reducer and single-ring aromatic type high-efficiency water reducer, and can solve the problem of high price and restriction of large-scale use of AH single-ring aromatic type high-efficiency water reducer , application range limitations and other issues, to achieve the effects of reducing the discharge of toxic substances and strong alkali solutions, improving bleeding performance, optimizing molecular weight and molecular weight distribution

Active Publication Date: 2020-04-14
JINLING INST OF TECH
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  • Application Information

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Problems solved by technology

ASPF single-ring aromatic hydrocarbon type high-efficiency water-reducing agent has high water-reducing effect, but it is sensitive to the dosage and easy to bleed, which restricts its large-scale use in engineering
The price of AH single-ring aromatic hydrocarbon type high-efficiency water reducer is high, and its application range is also subject to certain restrictions.

Method used

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  • A kind of preparation method of monocyclic aromatic hydrocarbon type high-efficiency water reducer
  • A kind of preparation method of monocyclic aromatic hydrocarbon type high-efficiency water reducer
  • A kind of preparation method of monocyclic aromatic hydrocarbon type high-efficiency water reducer

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preparation example Construction

[0033] A method for preparing a monocyclic aromatic hydrocarbon type high-efficiency water reducer, the flow chart is as follows figure 1 shown, including the following steps:

[0034] Step 1, adding a part of anhydrous sodium sulfite and sodium sulfamate into water in sequence according to the mass ratio, stirring and dissolving, raising the temperature to 50°C, so that anhydrous sodium sulfite and sodium sulfamate are completely dissolved in water to form a uniform solution;

[0035] Step 2, continue to stir the solution, reduce the temperature of the solution to 40°C, gradually add acetophenone liquid into the reaction vessel, control the temperature of the system not to exceed 40°C, and complete the addition within 30 minutes;

[0036] Step 3. Raise the temperature of the solution to 60-70°C. Slowly add part of the formaldehyde solution dropwise under rapid stirring to avoid gelation caused by too fast drop rate of formaldehyde. During the entire process of adding formalde...

Embodiment 1

[0043] Weigh 35kg of anhydrous sodium sulfite and 60kg of sodium sulfamate into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser, and add 250kg of water. Start the mixer and stir at a certain speed. Raise the temperature to 50°C to completely dissolve anhydrous sodium sulfite and sodium sulfamate in water to form a uniform solution. Continue to stir the solution, reduce the temperature of the solution to 40°C, gradually add 95kg of light yellow oily acetophenone liquid into the reaction vessel, control the system temperature not to exceed 40°C, and finish adding the acetophenone liquid within 30 minutes. Raise the temperature of the solution to 60°C, slowly add 125kg of formaldehyde solution dropwise under rapid stirring, and finish adding the formaldehyde solution dropwise within 1 hour. The color of the solution changes from light yellow to yellow, and sulfonated formaldehyde-benzene Ethanone condensation intermediate. The...

Embodiment 2

[0045] Take by weighing 30kg of anhydrous sodium sulfite and 60kg of sodium sulfamate and put it into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser, and add 245kg of water. Start the mixer and stir at a certain speed. Raise the temperature to 50°C to completely dissolve anhydrous sodium sulfite and sodium sulfamate in water to form a uniform solution. Continue to stir the solution, lower the solution temperature to 40°C, gradually add 90-95kg of light yellow oily acetophenone liquid into the reaction vessel, control the system temperature not to exceed 40°C, and add the acetophenone liquid in about 30 minutes. Raise the temperature of the solution to 60°C, slowly add 120kg of formaldehyde solution dropwise under rapid stirring, and drop the formaldehyde solution within 1 hour. The color of the solution changes from light yellow to yellow, and sulfonated formaldehyde-benzene Ethanone condensation intermediate. Then, add 30...

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Abstract

The invention discloses a preparing method of a monocyclic aromatic hydrocarbon efficient water reducing agent. In the monocyclic aromatic hydrocarbon efficient water reducing agent, anhydrous sodium sulfite, sodium sulfamate, acetophenone, bisphenol A, and formaldehyde monomer are adopted as main raw materials. The preparing method comprises the steps of firstly using sodium hydroxide generated by hydrolysis of part of anhydrous sodium sulphite as a catalyst, under an alkaline condition, making a condensation reaction happen between acetophenone and part of formaldehyde, making acetophenone react with a compound sulfonating agent (sodium sulfamate and a hydrolysis product of anhydrous sodium sulphite), and introducing amino groups and sulfonic acid groups onto benzene rings to form a sulphonate formaldehyde-acetophenone condensation product intermediate; then under an alkaline condition, making a methylation reaction happen between bisphenol A and the other part of formaldehyde so that bisphenol A and the other part of formaldehyde can be condensed into a bisphenol A-formaldehyde intermediate, and meanwhile adding the rest hydrolysis product of anhydrous sodium sulphite and formaldehyde to the bisphenol A-formaldehyde intermediate to introduce sulfonate; finally, making a condensation polymerization reaction happen between a sulphonate formaldehyde-acetophenone condensed intermediate and a sulphonate bisphenol A-formaldehyde intermediate so that the monocyclic aromatic hydrocarbon efficient water reducing agent can be synthesized. The molecular chains of the monocyclic aromatic hydrocarbon efficient water reducing agent have -SO3H, -OH, and -NH2 groups, under a low doping dosage, the monocyclic aromatic hydrocarbon efficient water reducing agent plays a good dispersion effect on cement particles, and meanwhile green concrete which is doped with the monocyclic aromatic hydrocarbon efficient water reducing agent has a low bleeding rate.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency water reducer, in particular to a preparation method of a monocyclic aromatic hydrocarbon type high-efficiency water reducer, which belongs to the field of concrete materials. Background technique [0002] High-efficiency water reducer is an indispensable component for the preparation of civil engineering materials, and has been widely used in the construction of civil engineering such as buildings, bridges, tunnels, and drilling platforms. Under the condition of keeping the working performance of concrete unchanged, adding a small amount of high-efficiency water reducing agent can reduce the water consumption of concrete materials by more than 30%, and the fresh concrete mixed with high-efficiency water reducing agent is easy to scratch and vibrate. The use of high-efficiency water reducers also reduces the amount of water in concrete materials and increases the compactness of hardened...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G6/02C08G8/28C04B24/16C04B103/30
CPCC04B24/166C04B2103/302C08G6/02C08G8/28C08G81/00
Inventor 赵晖邓敏杜杨徐海生韩颖
Owner JINLING INST OF TECH
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