A kind of preparation method of modified sulfamate high-efficiency water reducer containing carboxyl group

A technology of sulfamate and high-efficiency water-reducing agent, applied in the field of concrete materials, can solve the problems of high production cost and complex molecular structure of high-efficiency water-reducing agent, reduce investment in production equipment and fixed assets, overcome easy bleeding, low cost effect

Active Publication Date: 2017-03-08
JIAHUA CHEM MAOMING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this modification method also has the following problems: (1) The production cost of AS superplasticizer is still too high
In addition, because the molecular structure of the sulfamic acid-based high-efficiency water reducer is relatively complex, and different monomers will have different molecular structures

Method used

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  • A kind of preparation method of modified sulfamate high-efficiency water reducer containing carboxyl group
  • A kind of preparation method of modified sulfamate high-efficiency water reducer containing carboxyl group
  • A kind of preparation method of modified sulfamate high-efficiency water reducer containing carboxyl group

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preparation example Construction

[0024] A preparation method of a carboxyl-containing modified sulfamate high-efficiency water reducer, comprising the following steps:

[0025] Step 1, adding sodium metabisulfite, sodium p-aminobenzenesulfonate, bisphenol A, and salicylic acid into water in a mass ratio of 1.5-2:6.5-6.75:5.5-6:1, stirring and dissolving in order to form a uniform solution;

[0026] Step 2, heating the mixed solution to 70-80°C, adding 20wt% sodium hydroxide solution to adjust the pH value of the reaction system to 10-11, and keeping the temperature of the reaction solution at 80°C;

[0027] Step 3, slowly drop formaldehyde solution into the solution in step 2, the mass concentration of formaldehyde is 37%, control the drop rate of formaldehyde to finish adding dropwise within 20-30 minutes, then heat up to 90°C-95°C to react, react The time is 4 to 5 hours. After the reaction is completed, urea is added to remove the residual formaldehyde in the solution, and then cooled to room temperature; ...

Embodiment 1

[0031] Accurately weigh 30kg of sodium pyrosulfite, 130kg of sodium p-aminobenzenesulfonate, 110kg of bisphenol A, and 20kg of salicylic acid solids into a reaction kettle equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser, and then add 540 kg of water . Start the stirrer and stir at a speed of 180 rpm to completely dissolve the solid sodium pyrosulfite, sodium p-aminobenzenesulfonate, bisphenol A, and salicylic acid in water to form a uniform solution. The temperature of the mixed solution was slowly raised to 70° C., and the pH value of the reaction system was adjusted to 10-11 with 20% sodium hydroxide solution. Keep the temperature of the reaction solution at 80° C., slowly add 160 kg of formaldehyde solution (37 wt % concentration) dropwise, and control the addition of the formaldehyde solution within 20 minutes. Then the temperature of the solution was raised to 90° C. and reacted for 4 hours. After the reaction, a small amount of urea was...

Embodiment 2

[0033] Accurately weigh 40kg of sodium metabisulfite, 135kg of sodium p-aminobenzenesulfonate, 120kg of bisphenol A, and 20kg of salicylic acid solids into a reaction kettle equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser, and then add 550 kg of water . Start the stirrer and stir at a speed of 180 rpm to completely dissolve the solid sodium pyrosulfite, sodium p-aminobenzenesulfonate, bisphenol A, and salicylic acid in water to form a uniform solution. The temperature of the mixed solution was slowly raised to 80° C., and the pH value of the reaction system was adjusted to 10-11 with 20% sodium hydroxide solution. Keep the temperature of the reaction solution at 80° C., slowly add 160 kg of formaldehyde solution (37 wt % concentration) dropwise, and control the addition of the formaldehyde solution within 20 minutes. Then the temperature of the solution was raised to 90° C. and reacted for 5 hours. After the reaction, a small amount of urea w...

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Abstract

The present invention discloses a carboxyl group-containing modified amino sulfonate high efficiency water reducer preparation method comprising the following steps: sodium metabisulfite, sodium p-aminobenzene sulfonat, bisphenol-A and salicylic acid are successively added into water and dissolved with evenly stirring to form a uniform solution; the solution mixture is warmed to 70-80 DEG C, and an alkaline liquid is added into the reaction system for adjusting pH value to 10 to 11; a formaldehyde solution is slowly added dropwise into the solution, the formaldehyde dropping speed is controlled, and then the solution mixture is warmed to 90-95DEG C for reaction, after the completion of the reaction, urea is added to remove residual formaldehyde in the solution, and then the solution is cooled to room temperature; and then the solution mixture is cured in a reaction kettle to obtain a dark red liquid, which is a carboxyl group-containing modified amino sulfonate high efficiency water reducer with the solid content of 36%. The MAS high efficiency water reducer prepared by the method not only has the characteristics of small dosage and good water reducing performance of a traditional AS high efficiency water reducer, also has a lower cost of production. The bleeding rate of concrete doped with the MAS high efficiency water reducer is significantly reduced compared with the bleeding rate of concrete doped with the AS high efficiency water reducer.

Description

technical field [0001] The invention relates to the field of concrete materials, in particular to a preparation method of a carboxyl-containing modified sulfamate high-efficiency water reducer. Background technique [0002] Concrete is a material prepared according to experience, and it is relatively simple from raw material selection, preparation process to construction application. In the late 1970s, concrete technology has made great progress. Lightweight, high-strength, durable, economical and practical high-performance concrete technology has gradually replaced conventional concrete in civil engineering structures such as large buildings, bridges, tunnels, and drilling platforms. Today, high-efficiency water-reducing agents have become an essential component for the preparation of high-performance concrete. Adding high-efficiency water-reducing agents to concrete materials can reduce the water consumption of concrete materials by more than 30%. High-performance concrete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C04B103/30
Inventor 赵晖邓敏宣卫红王潘绣韩颖
Owner JIAHUA CHEM MAOMING
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