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Preparation method of waterborne polyaniline modified epoxy cationic emulsion

A water-based polyaniline and ionic emulsion technology, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of unimproved compatibility, aggregation and delamination, and poor coating compactness. Long-term anti-corrosion performance, reducing the generation of waste water, and the effect of easy control of the reaction

Active Publication Date: 2018-11-16
扬州市伊丽特高分子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation method of the polyaniline-modified waterborne epoxy resin coating of published patent (CN105602312A, CN102702920 A) mainly focuses on doping polyaniline by acid such as hydrochloric acid, sulfuric acid, dodecylbenzenesulfonic acid, to improve the polyaniline Dispersion, since the doping of polyaniline needs to be in an acidic environment, and a large amount of salt will be produced, the resulting polyaniline has improved dispersibility, but the resulting wastewater is difficult to treat
At the same time, due to the conjugated structure of polyaniline, acid-doped polyaniline and water-based epoxy coatings are physically blended to obtain polyaniline-modified epoxy coatings. The compatibility with coating resins has not been improved, and aggregation will occur after long-term storage Delamination phenomenon, which makes the compactness of the coating worse and leads to the decline of the comprehensive performance of anti-corrosion coatings
[0004] Aiming at the poor dispersibility and compatibility of polyaniline and water-based epoxy resin, which affects the comprehensive anti-corrosion performance of water-based epoxy resin coatings

Method used

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  • Preparation method of waterborne polyaniline modified epoxy cationic emulsion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of water-based polyaniline modified epoxy cationic emulsion, the specific formula is shown in Table 1:

[0028] The preparation formula of table 1 waterborne polyaniline modified epoxy cationic emulsion

[0029] Epoxy resin (equivalent weight 196)

25g

Alcohol solvent n-butanol

10g

Diethanolamine

7g

5-aminosalicylic acid

0.03g

Acetic acid

5.5g

aniline

0.5g

Ditoluoyl peroxide

1g

Deionized water

50.97g

[0030] According to Table 1, heat up the epoxy resin and solvent to 60°C with stirring, and preheat for 15 minutes; raise the temperature to 85°C, add diethanolamine dropwise evenly, and add the dropwise time for 15 minutes; cool down to 60°C, add 5-amino water Salicylic acid, react for 15 minutes, add acetic acid, react for 30 minutes; heat up to 65°C, add aniline, add dibenzoyl peroxide solution under stirring conditions, and then react at constant temperature for 4 hou...

Embodiment 2

[0033] The preparation of water-based polyaniline modified epoxy cationic emulsion, the specific formula is shown in Table 2:

[0034] The preparation formula of table 2 waterborne polyaniline modified epoxy cationic emulsion

[0035] Epoxy resin (equivalent to 400)

[0036] According to Table 2, heat the epoxy resin and solvent to 60°C with stirring, preheat for 15 minutes; heat up to 85°C, add diethanolamine dropwise for 15 minutes; cool down to 60°C, add 5-amino water Salicylic acid, react for 15 minutes, add acetic acid, react for 30 minutes; heat up to 67°C, add aniline, add dibenzoyl peroxide solution under stirring conditions, and then react at constant temperature for 4 hours; to 50°C, remove the solvent under reduced pressure, and then Add deionized water for high-speed emulsification to obtain water-based polyaniline modified epoxy cationic emulsion.

Embodiment 3

[0038] The preparation of water-based polyaniline modified epoxy cationic emulsion, the specific formula is shown in Table 3:

[0039] The preparation formula of table 3 waterborne polyaniline modified epoxy cationic emulsion

[0040] Epoxy resin (equivalent 500)

[0041] According to Table 3, heat up the epoxy resin and solvent to 60°C with stirring, and preheat for 30 minutes; raise the temperature to 75°C, add diethanolamine dropwise for 30 minutes; cool down to 50°C, add 5-amino salicyl Acid, react for 30 minutes, add acetic acid, react for 25 minutes; heat up to 75°C, add aniline, add azobisisobutylcyanide solution under stirring conditions, and then react at constant temperature for 24h; to 50°C, remove the solvent under reduced pressure, and then add High-speed emulsification with deionized water to obtain water-based polyaniline modified epoxy cationic emulsion.

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Abstract

The invention discloses a preparation method of waterborne polyaniline modified epoxy cationic emulsion and belongs to the technical field of anticorrosive coating. The preparation method is characterized by comprising the following steps: firstly, raising the temperature of epoxy resin and part of a solvent and activating; adding primary secondary amine and carrying out ring opening and chain expansion; then adding aromatic organic acid containing -NH2 and acetic acid and neutralizing; finally, adding aniline and an oil-soluble initiator, and initiating polymerization at 65 to 75 DEG C; thendecompressing and removing the solvent; adding de-ionized water and stirring and emulsifying at a high speed to obtain the waterborne polyaniline modified epoxy cationic emulsion. According to the preparation method disclosed by the invention, a chemical modification method is adopted, and polyaniline and the epoxy resin are connected through a covalent bond to synthesize waterborne polyaniline modified epoxy resin, so that the problems of dispersity and compatibility of the conducting polyaniline in an epoxy resin matrix are solved, and the metal anticorrosion performance and the environment-friendly performance of polyaniline coating are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and relates to a preparation method of water-based polyaniline modified epoxy cationic emulsion, in particular to a preparation method applied to intelligent anti-corrosion cathodic electrophoretic coatings. Background technique [0002] Water-based epoxy resin coating is a coating with water as solvent or dispersion medium. It has good water resistance and chemical resistance, especially excellent adhesion, low volatile organic compound content, low odor, safe storage and transportation, and has a non-toxic The advantages of pollution, safety and non-toxicity, and convenient construction meet the requirements of environmental protection and become an important direction and research hotspot in the development of coatings. However, in the actual use of water-based epoxy coatings, there is a problem that the protective properties will be lost due to mechanical damage, which makes i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D5/44C08G59/50C08G59/52C08G73/02
CPCC08G59/5033C08G59/52C08G73/0266C09D5/08C09D5/4453C09D5/4488
Inventor 朱爱萍姜云龙
Owner 扬州市伊丽特高分子材料科技有限公司
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