Preparation method of sulfonated bisphenol A-formaldehyde condensate superplasticizer

A technology of formaldehyde condensate and high-efficiency water reducer, which is applied in the field of high-efficiency water reducer and production, can solve the problems of human harm and environmental pollution, and achieve the effects of saving material costs, reducing sewage costs, and saving investment in production equipment

Active Publication Date: 2014-02-26
JINLING INST OF TECH
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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 t

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  • Preparation method of sulfonated bisphenol A-formaldehyde condensate superplasticizer

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Embodiment 1

[0021] Example 2:

Embodiment 2

[0023] Embodiment 3:

Embodiment 3

[0025]

[0026] Embodiment 3 is a preferred embodiment of the present invention. The water-reducing rate and strengthening effect of the sulfonated bisphenol A-formaldehyde condensate high-efficiency water-reducer of Test Example 3 in concrete is measured in the test from 0.3-0.6% The water reducing rate of the sulfonated bisphenol A-formaldehyde condensate high-efficiency superplasticizer, and compared with the test results of the water-reducing rate of the naphthalenesulfonate high-efficiency superplasticizer (NF) at the same dosage, the concrete mix ratio used in the experiment is shown in the table 1. The cement is Jiangnan-Onoda PⅡ grade 52.5 Portland cement, the sand rate is 36-40%, the crushed stone is the second grade, 5-20mm crushed stone accounts for 40%, 20-40mm crushed stone accounts for 60%, and the concrete slump is controlled The slump is 7-9cm, the admixture is liquid, calculated by weight percentage of cement:

[0027] Table 1. The mix ratio of the concrete u...

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Abstract

The invention discloses a preparation method of a sulfonated bisphenol A-formaldehyde condensate superplasticizer, which comprises the following steps of weighing bisphenol A, sodium hydrogen sulfite and water, and adding into a reaction kettle with a stirrer, a thermometer, a dropping funnel and a reflux condensing tube; dropwise adding sodium hydroxide to adjust the pH value of the solution, and increasing the temperature of the solution to 70 DEG C; dropwise adding a formaldehyde solution, and heating and reacting for 6 hours; adding urea and naturally cooling to room temperature; curing the product in the reaction kettle for 6 hours. Compared with the traditional superplasticizer adopting concentrated sulfuric acid as a sulfonating agent, the discharge of strong acid and strong base solutions is avoided in the production process, and green production is realized; compared with the traditional production process of sulfonated bisphenol-formaldehyde condensate, the influence on human bodies and environment is reduced, green production is realized, the material cost is saved, and the pollution discharge cost is reduced.

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...

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Application Information

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IPC IPC(8): C04B24/22C04B103/30
Inventor 赵晖邓敏宣卫红杨忠韩颖
Owner JINLING INST OF TECH
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