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A kind of preparation method of naphthalene series water reducing agent

A naphthalene-based water reducer and hydrolysis reaction technology, which is applied in the field of building materials, can solve the problems of easy precipitation of white solids during storage of formaldehyde solutions, uncontrollable condensation reaction process, increased equipment and production costs, etc., to achieve a stable reaction rate, The production process is simple and stable, and the effect of low cost

Active Publication Date: 2015-12-02
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can solve the problem of formaldehyde volatilization, it increases equipment and production costs
In addition, in winter, if the formaldehyde solution is stored for a long time, it is easy to precipitate white solids, which will also lead to inaccurate measurement of formaldehyde.
Inaccurate formaldehyde measurement will lead to uncontrollable condensation reaction process, which will cause fluctuations in product performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 134.7g industrial naphthalene (purity ≥95%, 1.0mol) and 140.0g concentrated sulfuric acid (purity ≥98%, 1.4mol) to the reaction bottle, heat up to 165-170°C for 2 hours, add a certain amount of water after the reaction , hydrolyzed at 110°C for 0.5h, and the acidity was controlled to 28% after hydrolysis. After cooling down to 90°C, add 34.4g of paraformaldehyde (purity ≥ 96%, 1.1mol is calculated as formaldehyde) and 58.5g of water, gradually raise the temperature to 100-105°C, keep it warm for 4 hours, and add water to control the viscosity during the heat preservation process polymerization. After the reaction is finished, add liquid caustic soda to adjust the pH to 6-8, and dry to obtain a naphthalene-based water reducer.

Embodiment 2

[0023] Add 134.7g industrial naphthalene (purity ≥95%, 1.0mol) and 130.0g concentrated sulfuric acid (purity ≥98%, 1.3mol) to the reaction bottle, raise the temperature to 150~155℃ for 4 hours, add a certain amount of water after the reaction , hydrolyzed at 100°C for 1.5h, and the acidity was controlled to 26% after hydrolysis. After cooling down to 80°C, add 27.0g of paraformaldehyde (purity ≥ 99%, 0.9mol is calculated as formaldehyde) and 54.0g of water, gradually raise the temperature to 100-105°C, keep it warm for 8 hours, and add water to control the viscosity during the heat preservation process polymerization. After the reaction is finished, add liquid caustic soda to adjust the pH to 6-8, and dry to obtain a naphthalene-based water reducer.

Embodiment 3

[0025] Add 134.7g industrial naphthalene (purity ≥ 95%, 1.0mol), 135.0g concentrated sulfuric acid (purity ≥ 98%, 1.35mol) to the reaction bottle, raise the temperature to 170~175℃ for 1.5h, add a certain amount of Water, hydrolyzed at 120°C for 0.5h, after hydrolysis, the acidity is controlled to 26%. After cooling down to 90°C, add 40.6g of paraformaldehyde (purity ≥ 96%, 1.3mol is calculated as formaldehyde) and 40.6g of water, gradually raise the temperature to 115-120°C, keep it warm for 8 hours, and add water to control the viscosity during the heat preservation process polymerization. After the reaction is finished, add liquid caustic soda to adjust the pH to 6-8, and dry to obtain a naphthalene-based water reducer.

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Abstract

The invention provides a method for preparing a naphthalene series water reducer. The method comprises the following steps: sulfonation: carrying out a sulfonation reaction of naphthalene and concentrated sulfuric acid; hydrolysis: adding water into the sulfonation reaction product for hydrolysis, and hydrolyzing a by-product in the sulfonation reaction; condensation: adding poly formaldehyde and water into the hydrolysis reaction product for condensation; and neutralization: adjusting pH of the condensation reaction product to be 6-8, and drying to obtain the naphthalene series water reducer. The preparation method has the advantages of simple and stable production process and easily controlled parameters, and the prepared naphthalene series water reducer product has stable performance and good quality.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a preparation method of a chemical admixture, in particular to a preparation method of a naphthalene-based water reducer. Background technique [0002] Concrete water reducing agent is an admixture that can reduce mixing water consumption, improve concrete strength, and save cement consumption under the condition of concrete workability and cement consumption. Naphthalene-based water reducer is currently the most widely used high-efficiency water reducer in the domestic market. According to statistics, in 2009, naphthalene series and other second-generation water reducers accounted for 67.5% of the total output of all synthetic water reducers, 67.1% in 2010, and 66.5% in 2011. Although the proportion has decreased year by year, their prices are relatively cheap, and It has good compound performance with early strength agent and retarder, and can form a multifunctional composite h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B103/30
Inventor 黄玉成吕志锋冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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