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Process for prparing polyaniline corrosion-resistant paint

A technology for anti-corrosion coatings and preparation processes, applied in anti-corrosion coatings, coatings, etc., can solve the problems of limited practicability, low dissolution rate, expensive solvents, etc., to reduce corrosion current, improve corrosion potential, and excellent wear resistance. Effect

Inactive Publication Date: 2002-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently adopted anti-corrosion coating methods are as follows: 1, PANI coating of electrochemical deposition, this method is difficult to be used for larger metal parts, so the application is limited; 2, through PANI and traditional polymer The co-solution of the blend forms a blend coating, which can be used alone without a topcoat, but there are still deficiencies
Mainly: 1. PANI has a very low dissolving rate in common organic solvents, even insoluble. Although it has a certain dissolving rate in other high-boiling point solvents such as N-methylpyrrolidone (NMP), its practicability is limited; 2. The boiling points of these solvents are relatively High, which has adverse effects on the coating quality; ③Most of these solvents are relatively expensive, highly toxic, and their applications are limited
Zhang Jinyong and others used polyamine as the solvent of polyaniline and the curing agent of epoxy resin to obtain polyaniline anti-corrosion coatings, but the solubility of polyaniline in polyamine is limited, most of polyaniline is filtered out as insoluble matter, only a small amount The soluble part is utilized, and the price of polyaniline is very high, so this method is very uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, preparation of component A: Mix 25% bisphenol A epoxy resin, 20% non-conductive intrinsic polyaniline powder and 30% xylene, add to a ball mill and grind for 2 hours, and grind the polyaniline It is a particle with a diameter of 100nm, and then add 20% of 350-mesh active silica powder as filler, 1% of KH-560 as coupling agent, 2% of methyl silicone oil as defoamer, and 2% of 202P as anti-settling agent Grinding for 0.5h;

[0016] B component preparation:

[0017] Mechanically stir 20% phenalkamine and 80% polyamide, and mix well;

[0018] How to use the paint:

[0019] Mix component A and component B uniformly at a weight ratio of 10:1, apply on the pretreated metal surface, and cure at room temperature.

Embodiment 2

[0020] Example 2, preparation of component A: mix 40% E-20 epoxy resin, 1% non-conductive intrinsic polyaniline powder and 55% n-butanol, add to a ball mill and grind for 3 hours, and grind the polyaniline It is a particle with a diameter of about 100nm, and then add 1% of 400-mesh active silica powder as filler, 2% of KH-560 as coupling agent, 0.5% of methyl silicone oil as defoamer, and 0.5% of 202P as anti-sedimentation Agent grinding 2h;

[0021] B component preparation:

[0022] Mix 40% phenalkamine, 55% polyamide and 5% methyl isobutyl ketone with mechanical stirring, and mix well;

[0023] How to use the paint:

[0024] Mix component A and component B uniformly at a weight ratio of 20:1, apply on the pretreated metal surface, and cure at room temperature.

Embodiment 3

[0025] Example 3, preparation of component A: mix 30% E-44 epoxy resin, 10% non-conductive intrinsic polyaniline powder and 40% methyl isobutyl ketone, add to a ball mill and grind for 2 hours, poly Aniline should be ground into particles with a diameter of about 100nm, and then add 15% of 800-mesh active silica powder as filler, 1% of KH-560 as coupling agent, 2% of methyl silicone oil as defoamer, and 2% of 202P as Anti-sedimentation agent grinding for 1h;

[0026] B component preparation:

[0027] Mix 30% phenalkamine, 67% polyamide and 3% n-butanol with electromagnetism and mix well;

[0028] How to use the paint:

[0029] Mix component A and component B uniformly at a weight ratio of 15:1, apply on the pretreated metal surface, and cure at room temperature.

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Abstract

The present invention discloses a preparation process of polyaniline anticorrosive coating, and includes the following steps: mixing epoxy rsin, polyaniline and diluent uniformly, grinding, then mixing them with phenol aldehide amine, polyamide and diluent uniformly according to the ratio of 10-20:1, cuating on the metal surface and solidifying at room temp. so as to implement said invention. Said anticorrosive coating can form a layer of compact film on the steel surface, can raise corrosion potential of steel, reduce corrosion current and can prevent and relieve corrosion of steel, and said coating layer possesses high harndess and excellent abrasive resistance, after said coating layer is scratched, a passive film can be formed so as to can protect metal from corrosion.

Description

1. Technical field [0001] The invention relates to an anti-corrosion coating, in particular to a preparation process of a polyaniline anti-corrosion coating. 2. Background technology [0002] Metal corrosion will bring huge losses to the national economy, and its damage cases can be found in all occasions where metal is used. According to statistics, metal equipment and materials scrapped due to corrosion are equivalent to 1 / 3 of metal output, which is a huge waste of natural resources. In order to prevent and slow down the corrosion of metals, people often use organic coatings containing heavy metals such as chromium, lead, molybdenum and other corrosion inhibitors and organic or inorganic coatings containing zinc. Although such methods are relatively effective, they are extremely harmful to the environment, and once the coating is slightly scratched, its anti-corrosion effect will be greatly reduced. Therefore, people are still looking forward to a better anti-corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D179/02
Inventor 井新利王杨勇
Owner XI AN JIAOTONG UNIV
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