Preparation method of sulfonated bisphenol A-formaldehyde condensate superplasticizer

A formaldehyde condensate and high-efficiency water-reducing agent technology, applied in the field of high-efficiency water-reducing agent and production, can solve problems such as human harm and environmental pollution, and achieve the effects of saving material costs, reducing sewage costs, and saving labor costs

Active Publication Date: 2015-07-15
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application provides a preparation method for a sulfonated bisphenol A-formaldehyde condensate high-efficiency water reducer, which solves the technical problems of using phenol as a sulfonating agent in the prior art, which causes great pollution to the environment and is harmful to the human body.

Method used

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  • Preparation method of sulfonated bisphenol A-formaldehyde condensate superplasticizer

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Effect test

Embodiment 1

[0019] Weigh 240Kg of bisphenol A, 85Kg of sodium bisulfite and 490Kg of water into a reaction kettle equipped with a stirrer, thermometer, dropping funnel and reflux condenser, start the stirrer, and stir until bisphenol A and sodium bisulfite are completely Dissolve in water to form a uniform solution; dropwise add sodium hydroxide with a mass fraction of 20% to adjust the pH of the solution to 1.5, and raise the temperature to 70°C; maintain the temperature of the solution at 70°C, and slowly add 170Kg mass fraction dropwise while stirring It is a 37% formaldehyde solution, and the formaldehyde solution should be added within 1 hour to avoid gelation caused by too fast formaldehyde drop rate; heat up to 90°C, keep warm for 5 hours, add 20Kg of urea to remove a small amount of formaldehyde in the solution, After the reaction reaches the end point, stop the reaction, cool naturally to room temperature, and mature the product in the reactor for 5 hours to obtain a deep red sulf...

Embodiment 2

[0021] Weigh 250Kg of bisphenol A, 90Kg of sodium bisulfite and 495Kg of water into a reaction kettle with a stirrer, thermometer, dropping funnel and reflux condenser, start the stirrer, and stir until bisphenol A and sodium bisulfite are completely Dissolve in water to form a uniform solution; dropwise add sodium hydroxide with a mass fraction ratio of 20% to adjust the pH value of the solution to 11, and raise the temperature to 70°C; maintain the temperature of the solution at 70°C, and slowly add 175Kg mass fraction dropwise while stirring It is a 37% formaldehyde solution, and the formaldehyde solution should be added within 1 hour to avoid gelation caused by too fast formaldehyde drop rate; heat up to 95°C, keep the temperature for 7 hours, add 30Kg of urea to remove a small amount of formaldehyde in the solution, When the reaction reaches the end point, stop the reaction, cool naturally to room temperature, and mature the product in the reactor for 6 hours to obtain a d...

Embodiment 3

[0023] Weigh 246Kg of bisphenol A, 88Kg of sodium bisulfite and 493Kg of water into a reaction kettle with a stirrer, thermometer, dropping funnel and reflux condenser, start the stirrer, and stir until bisphenol A and sodium bisulfite are completely Dissolve in water to form a uniform solution; dropwise add sodium hydroxide with a mass fraction ratio of 20% to adjust the pH value of the solution to 10.5, and raise the temperature to 70°C; maintain the temperature of the solution at 70°C, and slowly add 173Kg mass fraction dropwise while stirring It is a 37% formaldehyde solution, and the formaldehyde solution should be added within 1 hour to avoid gelation caused by too fast formaldehyde drop rate; heat up to 93°C, keep warm for 6 hours, add 25Kg of urea to remove a small amount of formaldehyde in the solution, When the reaction reaches the end point, stop the reaction, cool naturally to room temperature, and mature the product in the reactor for 6 hours to obtain a deep red s...

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Abstract

The invention discloses a preparation method of a sulfonated bisphenol A-formaldehyde condensate high-efficiency water reducer. Bisphenol A, sodium bisulfite and water are weighed and put into a mixer equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser. In the reaction kettle, add sodium hydroxide dropwise to adjust the pH of the solution, raise the solution temperature to 70°C; add formaldehyde solution dropwise, heat up for 6 hours, add urea, cool to room temperature naturally, and mature the product in the reaction kettle for 6 hours; Compared with the high-efficiency water reducer prepared by using concentrated sulfuric acid as the sulfonating agent, there is no discharge of strong acid and strong alkali solution in the production process, which realizes green production; compared with the traditional production process of sulfonated phenol-formaldehyde condensate, it reduces the harm to human body And environmental impact, realize green production, save material cost and reduce pollution discharge cost.

Description

technical field [0001] The invention relates to a high-efficiency water reducer for concrete and the production field, in particular to a preparation method of a sulfonated bisphenol A-formaldehyde condensate high-efficiency water reducer. Background technique [0002] High-efficiency water reducer is an essential component for preparing high-strength concrete. When applied to high-performance concrete, high-efficiency water reducer can reduce water consumption by 20-30%, make the concrete structure more compact, and improve the strength and durability of concrete. Because of the use of high-performance water reducers, lightweight, high-strength, durable, economical and practical high-performance concrete in the 21st century will gradually replace conventional concrete and be widely used in the construction of large buildings, bridges, and marine structures. Various cement concrete composite materials, such as reinforced concrete, prestressed concrete, fiber reinforced concr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/08C04B103/30
Inventor 赵晖邓敏宣卫红杨忠韩颖
Owner JINLING INST OF TECH
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