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Preparation method of polyaniline/salicylaldehyde modified chitosan corrosion inhibitor

A technology of chitosan and salicylaldehyde, applied in the field of metal corrosion and protection, can solve the problem of poor water solubility of chitosan, achieve good protection, improve anti-corrosion efficiency, large application market and research value.

Active Publication Date: 2019-11-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0007] The benefits of the present invention are: the corrosion inhibitor is prepared by modifying chitosan with salicylaldehyde, on the one hand, it solves the disadvantage of poor water solubility of chitosan, and on the other hand, it improves the anticorrosion efficiency of the corrosion inhibitor to metal

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  • Preparation method of polyaniline/salicylaldehyde modified chitosan corrosion inhibitor
  • Preparation method of polyaniline/salicylaldehyde modified chitosan corrosion inhibitor

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preparation example Construction

[0008] The present invention is the preparation method of polyaniline / salicylaldehyde modified chitosan corrosion inhibitor, and its steps are:

[0009] (1) At room temperature, first add chitosan to 0.35mol / L acetic acid solution so that the mass ratio of chitosan to acetic acid solution is 1:120~250, and dissolve chitosan in acetic acid solution for 1 ~4h; Then, add the ethanol solution containing salicylaldehyde to the acetic acid solution of chitosan, make the mass ratio of chitosan and salicylaldehyde be 1:4~8, control the adding speed, add within 0.5~1h Finished, then, heated to 30~80ºC, reacted for 4~8h to get salicylaldehyde modified chitosan;

[0010] (2) Then, at 5°C, add aniline and sulfamic acid to the above reaction system in sequence, so that the mass ratio of chitosan to aniline is 1:5~10, and the molar ratio of aniline to sulfamic acid is 1 :1~5, then add the acetic acid solution containing ammonium persulfate as initiator mixed solution, make the mol ratio of...

Embodiment 1

[0013] At room temperature, add 0.2g of chitosan to 48.0g of 0.35mol / L acetic acid solution, and dissolve chitosan in the acetic acid solution for 1 hour under stirring; then, add 1.0g of chitosan to the acetic acid solution The ethanol solution of salicylaldehyde, the addition speed is controlled, and the addition is completed within 0.5h, then heated to 50°C, and reacted for 5h. After the reaction is terminated, salicylaldehyde-modified chitosan is obtained. Then, at 5°C, 1.1g of aniline and 1.0g of sulfamic acid were sequentially added to the solution, and then the initiator mixture solution in which 4.6g of ammonium persulfate was dissolved in 10.0g of 0.35mol / L acetic acid solution was added in advance, and the addition was controlled. The speed was added within 0.5h, and then reacted for 6h. After the reaction was terminated, a polyaniline / salicylaldehyde modified chitosan corrosion inhibitor was obtained.

Embodiment 2

[0015] At room temperature, add 0.1g of chitosan to 25.0g of 0.35mol / L acetic acid solution, and dissolve chitosan in the acetic acid solution for 1h under stirring; then, add 0.4g of chitosan to the acetic acid solution For the ethanol solution of salicylaldehyde, the addition speed is controlled, and the addition is completed within 0.5 hours. Then, it is heated to 50° C. and reacted for 4 hours. After the reaction is terminated, salicylaldehyde-modified chitosan is obtained. Then, at 5°C, 1.1 g of aniline and 3.9 g of sulfamic acid were sequentially added to the solution, and then the initiator mixture solution in which 4.6 g of ammonium persulfate was dissolved in 10.0 g of 0.35 mol / L acetic acid solution was added in advance, and the addition was controlled. Speed, add within 0.5h, then react for 5h, after the reaction is terminated, polyaniline / salicylaldehyde modified chitosan corrosion inhibitor is obtained.

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Abstract

The invention discloses a preparation method for a polyaniline / salicylaldehyde modified chitosan corrosion inhibitor. The method comprises the steps that a certain amount of chitosan is dissolved in an acetic acid solution firstly, then a certain amount of a salicylaldehyde ethanol solution is added into the mixed solution, and under the condition that heating and stirring are carried out, reacting is carried out for a certain time to obtain the salicylaldehyde modified chitosan; and then a certain amount of aniline and a certain amount of sulfamic acid are sequentially added into the mixture,after the mixed solution is uniformly stirred, a certain amount of an acetic acid solution with an ammonium persulfate is added into the mixed solution, and after the reaction is finished, filtering,washing and filter cake drying are carried out to obtain the polyaniline / salicylaldehyde modified chitosan corrosion inhibitor.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, and in particular relates to the preparation technology of a corrosion inhibitor, that is, the preparation technology of a polyaniline / salicylaldehyde modified chitosan corrosion inhibitor. Background technique [0002] At present, the addition of corrosion inhibitors is an effective anti-corrosion method with significant economic benefits. The commonly used inorganic corrosion inhibitors in the early stage can form an insoluble protective film on the metal surface to prevent the damage of the corrosive medium to the metal. However, the biggest disadvantage of inorganic corrosion inhibitors is that they are more harmful to the environment and human body and require a higher concentration for work. The organic corrosion inhibitors commonly used in the early days are mainly organophosphorus compounds, which are not good for metal protection in practical applications. It causes environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
CPCC23F11/14
Inventor 冯辉霞孔佩佩陈娜丽谭琳赵丹王跃毅白德忠
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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