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Preparation method of naphthalene water reducer for high fever areas in Middle East

A naphthalene-based water-reducing agent and regional technology, applied in the field of preparation of naphthalene-based water-reducing agents, can solve the problems of rapid loss of concrete slump, poor water-reducing performance of water-reducing agents, and high sodium sulfate content, so as to facilitate construction and use , improve fluidity, prolong the effect of holding time

Inactive Publication Date: 2022-03-01
莱芜市兆信新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems in the prior art that the sand in the Middle East is particularly fine, the gradation is poor, and the mud content is high, resulting in poor water-reducing performance of the water-reducing agent, high sodium sulfate content, and rapid loss of concrete slump. The present invention provides a A high-performance naphthalene-based water reducer specially used in the high-heat regions of the Middle East. Based on the existing production process and equipment of the naphthalene-based water-reducer, the present invention replaces part of the industrial naphthalene with washing oil, reduces the amount of acid added, and adopts an oil-water azeotropic process Prolong the holding time, compound and add retarding, air-entraining and water-reducing components in the neutralization process, effectively improve the water-reducing and slump-preserving effects, and reduce the sodium sulfate content at the same time

Method used

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  • Preparation method of naphthalene water reducer for high fever areas in Middle East
  • Preparation method of naphthalene water reducer for high fever areas in Middle East

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for a naphthalene-based water reducer used in high-heat areas in the Middle East, comprising the following steps:

[0030] a. Sulfonation: Add 0.8t of industrial naphthalene and 0.4t of washing oil into the reactor, heat up to 100°C, then add 1.04t of concentrated sulfuric acid, heat up to 165°C, and use the oil-water azeotropic process to keep warm for 3 hours to obtain the sulfonated material ;

[0031] b. Hydrolysis: cool down the sulfonated material to 120°C, add water for hydrolysis for 100 minutes, and obtain a hydrolyzate;

[0032] c. Condensation: Add 1.12t of formaldehyde solution with a mass fraction of 37% to the hydrolyzed solution dropwise, finish dropping within 2 hours, control the reaction temperature at 95°C, and react for 90 minutes to obtain a condensation reaction solution;

[0033] d. Add water to dilute: add water to dilute the condensation reaction solution;

[0034] e. Neutralization: Add liquid caustic soda to the diluent ...

Embodiment 2

[0037] A preparation method for a naphthalene-based water reducer used in high-heat areas in the Middle East, comprising the following steps:

[0038] a. Sulfonation: Add 0.8t of industrial naphthalene and 0.24t of washing oil into the reaction kettle, raise the temperature to 130°C, then add 1.52t of concentrated sulfuric acid, raise the temperature to 160°C, and adopt the oil-water azeotropic process to keep warm for 5h to obtain the sulfonated material ;

[0039] b. Hydrolysis: cool down the sulfonated material to 110°C, add water for hydrolysis for 120 minutes, and obtain a hydrolyzate;

[0040] c. Condensation: Add 0.72 t of formaldehyde solution with a mass fraction of 37% to the hydrolyzed solution dropwise, finish dropping within 2 hours, control the reaction temperature at 90° C., and react for 120 minutes to obtain a condensation reaction solution;

[0041] d. Add water to dilute: add water to dilute the condensation reaction solution;

[0042] e. Neutralization: A...

Embodiment 3

[0045] A preparation method for a naphthalene-based water reducer used in high-heat areas in the Middle East, comprising the following steps:

[0046] a. Sulfonation: Add 0.8t of industrial naphthalene and 0.32t of washing oil into the reaction kettle, raise the temperature to 120°C, then add 1.472t of concentrated sulfuric acid, raise the temperature to 162°C, and adopt the oil-water azeotropic process to keep warm for 4h to obtain the sulfonated material ;

[0047] b. Hydrolysis: cool down the sulfonated material to 115°C, add water for hydrolysis for 110 minutes, and obtain a hydrolyzate;

[0048] c. Condensation: Add 0.88 t of formaldehyde solution with a mass fraction of 37% to the hydrolyzed solution dropwise, finish dropping within 2 hours, control the reaction temperature at 90° C., and react for 110 minutes to obtain a condensation reaction solution;

[0049] d. Add water to dilute: add water to dilute the condensation reaction solution;

[0050] e. Neutralization: ...

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Abstract

The invention provides a preparation method of a naphthalene water reducer used in high-heat areas of Middle East, and a process for preparing the naphthalene water reducer used in high-heat areas of Middle East comprises the processes of sulfonation, hydrolysis, condensation, dilution with water, neutralization, post-treatment and the like. Part of industrial naphthalene is replaced by washing oil, the acid adding amount is reduced, the heat preservation time is prolonged by adopting an oil-water azeotropic process, and retarding, air entraining and water reducing components are compounded and doped in a neutralization process, so that the water reducing and slump retaining effects are effectively improved. Alpha-naphthalenesulfonic acid generated in the sulfonation reaction process can be effectively converted into naphthalene and sulfuric acid through hydrolysis, the content of beta-naphthalenesulfonic acid in a sulfonated material is high through hydrolysis, retarding, air entraining and water reducing components are compounded and doped in the neutralization process, the water reducing rate is increased to 26% or above, the content of sodium sulfate is lower than 2.8%, and the content of sodium sulfate is lower than 2.8%. Meanwhile, the slump of the concrete is more than 160mm after 30 minutes, and the compressive strength is more than 49MPa.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a method for preparing a naphthalene-based water reducer used in high-heat areas in the Middle East. Background technique [0002] In construction engineering, concrete has become an important building material. Concrete is generally made of sand, stone, cement, admixtures, and water. In order to facilitate the construction of concrete, the amount of water added is related to the fluidity of concrete, and then affect the strength and durability of concrete. Water reducing agent is the most widely used admixture, which can significantly reduce the amount of water added to concrete, and at the same time greatly improve the fluidity of concrete, thereby improving the quality of concrete construction. [0003] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most water reducers are an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B24/34C04B103/30
CPCC04B40/0039C04B2103/302C04B24/20C04B24/06C04B24/18C04B24/34
Inventor 李传贵王平吴震张文峰李军蔺健全
Owner 莱芜市兆信新材料股份有限公司
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