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Method for preparing naphthalene series water reducer

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: 2013-11-06
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), 140.0g concentrated sulfuric acid (purity ≥98%, 1.4mol) into the reaction flask, heat up to 165~170℃ and react for 2h. After the reaction, add a certain amount of water , Hydrolysis at 110℃ for 0.5h, after hydrolysis, the acidity is controlled to 28%. After cooling down to 90℃, add 34.4g paraformaldehyde (purity ≥96%, 1.1mol as formaldehyde) and 58.5g water, gradually increase the temperature to 100~105℃, keep it for 4h, add water to control the viscosity during the heat preservation process polymerization. After the reaction, liquid caustic soda is added to adjust the pH=6-8, and dried to obtain a naphthalene-based water reducing agent.

Embodiment 2

[0023] Add 134.7g industrial naphthalene (purity ≥95%, 1.0mol), 130.0g concentrated sulfuric acid (purity ≥98%, 1.3mol) into the reaction flask, heat up to 150~155℃ and react for 4h. After the reaction, add a certain amount of water , Hydrolyzed at 100℃ for 1.5h, after hydrolysis, the acidity is controlled to 26%. After cooling to 80°C, add 27.0g paraformaldehyde (purity ≥99%, 0.9mol as formaldehyde) and 54.0g water, gradually increase the temperature to 100~105°C, keep it for 8h, add water to control the viscosity during the heat preservation process polymerization. After the reaction, liquid caustic soda is added to adjust the pH=6-8, and dried to obtain a naphthalene-based water reducing agent.

Embodiment 3

[0025] Add 134.7g industrial naphthalene (purity ≥95%, 1.0mol), 135.0g concentrated sulfuric acid (purity ≥98%, 1.35mol) into the reaction flask, heat up to 170~175℃ and react for 1.5h. After the reaction, add a certain amount of Water, hydrolyzed at 120℃ for 0.5h, after hydrolysis, the acidity is controlled to 26%. After cooling down to 90℃, add 40.6g of paraformaldehyde (purity ≥96%, 1.3mol as formaldehyde) and 40.6g of water, gradually increase the temperature to 115~120℃, keep for 8h, add water to control the viscosity during the heat preservation process polymerization. After the reaction, liquid caustic soda is added to adjust the pH=6-8, and dried to obtain a naphthalene-based water reducing agent.

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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 reducing agent. Background technique [0002] Concrete water reducing agent is an admixture that can reduce mixing water consumption, increase concrete strength, and save cement consumption under the conditions of constant workability and cement consumption. Naphthalene-based water-reducing agent is currently the most widely used high-efficiency water-reducing agent in the domestic market. According to statistics, second-generation water-reducing agents such as naphthalene series accounted for 67.5% of the total output of synthetic water-reducing agents in 2009, 67.1% in 2010, and 66.5% in 2011. Although the proportion is declining year by year, its price is relatively cheap. It has good compounding performance with early strength agent and retarder, and can form a multifun...

Claims

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Application Information

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Patent Type & Authority Applications(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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