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Preparation method of environment-friendly acid-pickling mist-suppressing synergist

A kind of synergist and environment-friendly technology, which is applied in the field of preparation of anti-fog synergist in the pickling process, can solve the problems of unsatisfactory pickling effect, large difference in pickling quality, single function of anti-fog agent, etc. High corrosion and fog suppression efficiency, reduced pickling process time, and good economic benefits

Inactive Publication Date: 2019-07-02
DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the current anti-fog and anti-corrosion effects, the function of the anti-fog agent is single, and the pickling quality of metal parts of different materials varies greatly, and the pickling effect in the mixed acid pickling solution is not ideal, and the adaptability is narrow

Method used

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  • Preparation method of environment-friendly acid-pickling mist-suppressing synergist
  • Preparation method of environment-friendly acid-pickling mist-suppressing synergist
  • Preparation method of environment-friendly acid-pickling mist-suppressing synergist

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix stearic acid, ethoxylation catalyst, and sodium dodecylsulfonate with a molar ratio of 1.2:0.25:0.6, then vacuum inhale into a magnetically stirred autoclave, heat up to 100°C, and place in a vacuum removal system Vacuumize, fill with nitrogen to 0.3MPa, heat up to 160°C, add ethylene oxide to react for 4 hours, cool to 30°C, vacuum remove ethylene oxide gas from the reaction system, fill with nitrogen and discharge;

[0022] (2) Take the raw materials according to the proportioning ratio, add 4.1 kg of sodium sulfite and 3.6 kg of ammonium sulfate into the reaction vessel, add water to dissolve, and stir evenly to obtain the mixed solution A;

[0023] (3) Add 2.8 kg of sodium nitrate to the mixed solution A of step (2). After it is completely dissolved, add 14.5 kg of fatty acid methyl ester ethoxylate sodium sulfonate while stirring, heat to 75° C., and react for 4 hours to obtain a mixture Liquid B;

[0024] (4) Add 3.6 kg of triethanolamine to the mixed liq...

Embodiment 2

[0026] (1) Mix stearic acid, ethoxylation catalyst, and sodium dodecylsulfonate with a molar ratio of 1.2:0.25:0.6, then vacuum inhale into a magnetically stirred autoclave, heat up to 100°C, and place in a vacuum removal system Vacuumize, fill with nitrogen to 0.3MPa, heat up to 160°C, add ethylene oxide to react for 4 hours, cool to 30°C, vacuum remove ethylene oxide gas from the reaction system, fill with nitrogen and discharge;

[0027] (2) Take the raw materials according to the proportioning ratio, add 5.5 kg of sodium sulfite and 7.2 kg of ammonium sulfate into the reaction vessel, add water to dissolve, stir evenly, and obtain mixed solution A;

[0028] (3) Add 6 kg of sodium nitrate to the mixed solution A in step (2), and after it is completely dissolved, add 15.5 kg of fatty acid methyl ester ethoxylate sodium sulfonate while stirring, heat to 80° C., and react for 3 hours to obtain a mixed solution B;

[0029] (4) Add 6 kg of triethanolamine to the mixed liquid B ...

Embodiment 3

[0031] (1) Mix stearic acid, ethoxylation catalyst, and sodium dodecylsulfonate with a molar ratio of 1.2:0.25:0.6, then vacuum inhale into a magnetically stirred autoclave, heat up to 100°C, and place in a vacuum removal system Vacuumize, fill with nitrogen to 0.3MPa, heat up to 160°C, add ethylene oxide to react for 4 hours, cool to 30°C, vacuum remove ethylene oxide gas from the reaction system, fill with nitrogen and discharge;

[0032] (2) Take the raw materials according to the proportioning ratio, add 0.2 kg of sodium sulfite and 2 kg of ammonium sulfate into the reaction vessel, add water to dissolve, stir evenly, and obtain mixed solution A;

[0033] (3) Add 0.5 kg of sodium nitrate to the mixed solution A in step (2), and after it is completely dissolved, add 10 kg of fatty acid methyl ester ethoxylate sodium sulfonate while stirring, heat to 65°C, and react for 4 hours to obtain a mixed solution B;

[0034] (4) Add 2kg of triethanolamine to the mixed solution B in ...

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Abstract

The invention relates to a preparation method of an environment-friendly acid-pickling mist-suppressing synergist. The acid-pickling mist-suppressing synergist has the effects of corrosion inhibitionand mist suppression; the fatty acid methyl ester ethoxylate sodium sulfonate, the coconut oil fatty acid diethanolamide and the lauryl dimethyl amine oxide have synergistic effects and are added in the pickling solution to generate a closed foam layer; and the sodium sulfite and the ammonium sulfate can reduce the tension of the acid liquor on the surface of the metal so as to form a molecular film, so that volatilization of the acid mist can be effectively prevented, and the mist-suppressing effect can reach 95% or above. The triethanolamine and the acid liquor can generate a certain chemical reaction, so that the reaction between the acid liquor and the metal is prevented, and the effect of corrosion inhibition is achieved. The synergist is high in corrosion inhibition efficiency and mist-suppressing efficiency, and can reduce the time of the acid pickling process, so that the acid pickling efficiency is improved; moreover, the synergist does not contain chemical reagents capable ofpolluting the environment, and accords with the Chinese requirements of acid pickling and mist-suppressing corrosion inhibitors; and the synergist is simple in preparation process, low in raw material cost and good in economic benefit.

Description

technical field [0001] The invention belongs to the field of metal treatment, and in particular relates to a preparation method of a fog-suppressing synergist in the pickling process. Background technique [0002] During metal processing, the metal surface will be oxidized to produce a black and yellow tight oxide layer. In order to improve the appearance and corrosion resistance of the metal, the processed metal must be pickled. In the pickling process, a mixed acid pickling process is usually used. During the mixed acid pickling process, a large amount of acid mist will be generated due to the violent chemical reaction between metals and metal oxides and strong acids. Acid mist has the characteristics of high instantaneous concentration and strong corrosiveness, which not only causes serious harm to the environment, but also endangers human health, and can easily lead to strong corrosion of workshop equipment and facilities. In addition, the metal matrix in pickling is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/04
CPCC23G1/04
Inventor 牛科光
Owner DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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