Polyaniline corrosion inhibitor and preparation method thereof

A technology of corrosion inhibitor and polyaniline, which is applied in the field of polyaniline corrosion inhibitors and its preparation, can solve the problems of operator safety hazards, difficulties in the preparation of corrosion inhibitors, and unsustainable protection effects, etc., to achieve long-lasting protection effects and improve Solubility and the effect of many adsorption sites

Active Publication Date: 2019-12-20
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the production process of existing corrosion inhibitors, organic acids or inorganic acids such as hydrochloric acid, p-benzenesulfonic acid, and citric acid are usually used. Both organic acids and organic acids will have a certain degree of irritation, which will bring a certain degree of irritation to the operator. potential safety hazards; some raw materials have certain toxicity or are relatively scarce, which brings certain difficulties to the preparation of corrosion inhibitors
In addition, the existing corrosion inhibitors also have the disadvantages of poor adsorption effect, unsustainable protective effect, and inability to protect metals in acidic environment for a long time.

Method used

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  • Polyaniline corrosion inhibitor and preparation method thereof
  • Polyaniline corrosion inhibitor and preparation method thereof
  • Polyaniline corrosion inhibitor and preparation method thereof

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preparation example Construction

[0033] The polyaniline corrosion inhibitor of the invention is prepared by using hydroxypropyl methylcellulose, ammonium persulfate, aniline and water in a proper proportion. The preparation method of polyaniline corrosion inhibitor comprises the steps:

[0034] (1) According to the ratio that the molar ratio of hydroxypropyl methylcellulose to water is 1:350~400, weigh the dry hydroxypropyl methylcellulose, add it into the water placed in the reaction vessel, and make it its dissolution;

[0035] (2) Oxidation reaction: according to the mol ratio of hydroxypropyl methylcellulose and ammonium persulfate is the ratio of 1: 2.84~4.32, first ammonium persulfate is dissolved in the water of the same volume in step (1), then in the magnetic Add the ammonium persulfate solution dropwise to the reactor under stirring, heat it to 60°C under the stirring condition of 100-300r / min to react for 6-12h, then cool to room temperature, and transfer to the dropping funnel middle;

[0036] ...

Embodiment 1

[0042] Weigh 6g of hydroxypropyl cellulose, dissolve it in 50ml of water in the reactor, and stir (magnet) to dissolve it. Oxidation reaction: Dissolve 4.8g of ammonium persulfate in 50ml of water, add the ammonium persulfate solution to the cellulose aqueous solution drop by drop under magnetic stirring, heat it to 60°C for 6h under the stirring condition of 200r / min, and then cool it down to room temperature and transferred to the dropping funnel. Polymerization reaction: Add 3ml of aniline to 48ml of distilled water, sonicate for 10min, cool down to 0-5°C, add the cellulose solution prepared in advance into the reactor under stirring with a constant pressure dropping funnel (about one drop per second) speed). Keep the temperature of the reaction system at 0-5°C, and react for 12 hours.

[0043] After the reaction was completed, it was filtered, the filter cake was washed with acetone, and vacuum-dried at 60° C. for 2 hours to obtain cellulose-doped polyaniline. The corro...

Embodiment 2

[0045] Weigh 6g of hydroxypropyl cellulose, dissolve it in 50ml of water in the reactor, and stir (magnet) to dissolve it. Oxidation reaction: Dissolve 6g of ammonium persulfate in 50ml of water, add the ammonium persulfate solution to the cellulose aqueous solution drop by drop under magnetic stirring, heat it to 60°C for 6 hours under stirring, then cool to room temperature, move to in the dropping funnel. Polymerization reaction: Add 3ml of aniline to 48ml of distilled water, sonicate for 10min, cool down to 0-5°C, add the cellulose solution prepared in advance into the reactor under stirring with a constant pressure dropping funnel (about one drop per second) speed). Keep the temperature of the reaction system at 0-5°C, and react for 12 hours.

[0046] After the reaction was completed, it was filtered, the filter cake was washed with acetone, and vacuum-dried at 60° C. for 2 hours to obtain cellulose-doped polyaniline. The corrosion inhibition efficiency was measured by...

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Abstract

The invention relates to an organic polymer corrosion inhibitor, in particular to a polyaniline corrosion inhibitor and a preparation method thereof. The corrosion inhibitor comprises the following raw materials: hydroxypropyl methylcellulose, ammonium persulfate, aniline and water; and the molar ratio of the hydroxypropyl methylcellulose, the ammonium persulfate and the aniline is 1: (2.84-4.32):(2.97-8.92). The preparation method comprises the following steps: firstly, mixing the hydroxypropyl methylcellulose with the water to form a hydroxypropyl methylcellulose solution, and then dropwiseadding an ammonium persulfate solution into the hydroxypropyl methylcellulose solution for oxidation reaction; and finally, dropwise adding an aniline solution into the reaction solution at a low temperature to carry out polymerization reaction, washing a filter cake by an organic solvent after the reaction is finished, and drying the filter cake to obtain cellulose-doped polyaniline. The polyaniline corrosion inhibitor has the advantages of simple manufacturing process flow, mild synthesis process conditions and no addition of other organic acids or inorganic acids; and the used raw materialcellulose is wide in source, harmless and nontoxic, the aniline raw material is easy to obtain, and the synthesized cellulose-doped polyaniline can be used for sustained-release protection on metalsin an acid solution.

Description

technical field [0001] The invention relates to an organic polymer corrosion inhibitor, in particular to a polyaniline corrosion inhibitor and a preparation method thereof. Background technique [0002] Polyaniline (Polvaniline, PANI) is a new polymer material prepared by oxidative polymerization of aniline monomer. The structural formula of polyaniline is: recovery unit and oxidation unit Composition, when y=0, it is a fully oxidized polyaniline (permigranline base PB); when y=1, it is a completely reduced all-benzene structure, corresponding to a reduced state (leucoemeraldine base LEB), when y=0.5 is The benzo-quinone alternating structure corresponds to the oxidized state of polyaniline (emgraniline base EB), also known as the intrinsic state of polyaniline, and each state can be transformed into each other. N heteroatoms and aromatic rings in the molecular structure of polyaniline (PANI), its easy synthesis, low cost, scratch resistance and pitting resistance hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/02C08L1/28C08G73/02C23F11/173
CPCC08L79/02C08G73/0266C23F11/173C08L1/286
Inventor 冯辉霞卢勇张靓陈娜丽谭琳赵丹张晨孔佩佩
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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