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A kind of preparation method of modified aniline terpolymer/waterborne resin composite anticorrosion coating

A technology of aniline terpolymer and phenylenediamine terpolymer, which is applied in the field of preparation of modified aniline terpolymer/water-based resin composite anticorrosion coatings to improve dispersion, improve adhesion, and overcome dispersion stability and the effect of poor compatibility

Active Publication Date: 2020-01-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an anti-corrosion coating, there are still some defects in the physical properties of water-based PANI and its adhesion to metals, and it needs to be modified to improve the overall performance of the coating.

Method used

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  • A kind of preparation method of modified aniline terpolymer/waterborne resin composite anticorrosion coating

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preparation example Construction

[0027] A preparation method of modified aniline terpolymer / water-based resin composite anticorrosion coating, the preparation steps are as follows:

[0028] Step 1) prepare modified aniline terpolymer

[0029] a. In parts by weight, first ultrasonically disperse 0.5 to 1.5 parts of o-hydroxyaniline and 2 to 3.8 parts of surfactants with sulfonic acid groups into 80 to 150 parts of doped acid solutions with a concentration of 1mol / L, and The dispersed aqueous solution is moved into a reactor and stirred in an ice bath for 20-40 minutes to obtain a mixed liquid A; wherein, the surfactant with a sulfonic acid group is p-toluenesulfonic acid or anthraquinone disulfonic acid. The doping acid is hydrochloric acid or citric acid. The oxidizing agent is ammonium persulfate or potassium persulfate.

[0030] b. Weigh 3 to 5 parts of aniline, and dissolve 4 to 7 parts of oxidizing agent in 80 to 150 parts of doping acid solution to prepare oxidizing agent / acid solution, then add anilin...

Embodiment 1

[0038] In parts by weight, first ultrasonically disperse 0.5 parts of o-hydroxyaniline and 2 parts of p-toluenesulfonic acid into 80 parts of hydrochloric acid solution with a concentration of 1mol / L, move the dispersed aqueous solution to the reactor and stir in an ice bath Mixed solution A was prepared in 20 minutes; 3.5 parts of aniline were weighed, and 4 parts of ammonium persulfate were dissolved in 150 parts of hydrochloric acid solution to obtain ammonium persulfate / acid solution, and then in mixed solution A, aniline and Ammonium persulfate / acid solution, the dropping time is 1 hour; subsequently, weigh 0.3 parts of p-phenylenediamine and dissolve it in 8 parts of absolute ethanol, and add the dissolved p-phenylenediamine solution dropwise to the reaction After the dropwise addition is completed, the reaction system continues to react in an ice-water bath for 3 hours to obtain an aniline-o-hydroxyaniline-p-phenylenediamine terpolymer solution; vacuum filter the terpoly...

Embodiment 2

[0042] In parts by weight, first 1.2 parts of o-hydroxyaniline and 3.8 parts of p-toluenesulfonic acid are ultrasonically dispersed into 150 parts of citric acid solution with a concentration of 1mol / L, and the dispersed aqueous solution is moved to the reactor and placed in an ice bath. Stir for 40 minutes to prepare mixed solution A; weigh 4 parts of aniline, and dissolve 5 parts of potassium persulfate in 80 parts of citric acid solution to prepare potassium persulfate / acid solution, and then add dropwise to mixed solution A Aniline and potassium persulfate / acid solution, the dropping time is 1.2 hours; subsequently, weigh 1.3 parts of p-phenylenediamine and dissolve it in 15 parts of absolute ethanol, and add the dissolved p-phenylenediamine solution dropwise into the reactor; after the dropwise addition was completed, the reaction system continued to react in an ice-water bath for 4 hours to obtain an aniline-o-hydroxyaniline-p-phenylenediamine terpolymer solution; the ter...

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Abstract

The invention discloses a preparation method for a modified aniline terpolymer / water-based resin composite anti-corrosive coating. The method comprises the following steps: a microemulsion polymerization method is adopted, aniline, o-hydroxyaniline and p-phenylenediamine are used as monomers, APS (ammonium persulfate) is used as an oxidant, and therefore an aniline-o-hydroxyaniline-p-phenylenediamine terpolymer with good water dispersibility is prepared under the action of an acid dopant and a surfactant having a sulfonic acid group; and water-based alkyd resin is used as a substrate, a modified polyaniline aqueous dispersion liquid is used as an additive, a mixed manner of ultrasonic treatment and mechanical stirring is utilized, and therefore the water-based alkyd resin / polyaniline composite heavy anticorrosive coating is prepared. The preparation method disclosed by the invention has the advantages of being friendly to the environment and convenient to operate, and having no pollution and low costs; and the prepared modified aniline terpolymer can also be compounded with other water-based resin substrates such as water-based epoxy resin, water-based polyurethane resin and water-based polyacrylate resin to prepare the composite anticorrosive coating.

Description

technical field [0001] The invention relates to the technical field of preparation of anticorrosion coatings, in particular to a preparation method of a modified aniline terpolymer / water-based resin composite anticorrosion coating. Background technique [0002] According to the authoritative data analysis of the National Association of Anti-corrosion Engineering (NACE), the annual loss caused by metal corrosion in the United States reaches more than 300 billion US dollars, accounting for 3%-5% of the gross national product (GDP), while the loss caused by metal corrosion in my country It accounts for 5% of GDP. Therefore, finding a suitable method to inhibit the corrosion of materials is of great significance to the energy saving, environmental protection and sustainable development of society. The use of anti-corrosion coatings to protect metals is the most economical, effective and widely used anti-corrosion method. Polyaniline (PANI) composite anti-corrosion coatings have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/08C09D7/65C09D5/08C09D7/20C08F283/02C08F220/14C08F220/34C08F220/32C08F220/06
CPCC08F283/02C09D5/08C09D7/20C09D7/65C09D167/08C08L79/02C08F220/14
Inventor 王海花胡光宇费贵强朱科王雪让娜娜郭丽媛邵彦明
Owner SHAANXI UNIV OF SCI & TECH
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