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Polyimide thermostable aqueous dispersion coating material and preparation method and use thereof

A water-based dispersion, polyimide technology, applied in coatings and other directions, can solve the problems of large solvent consumption, heavy environmental pollution, high toxicity, etc., and achieve low cost, high film quality, and high input-output ratio. Effect

Inactive Publication Date: 2008-03-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solvent-based coatings have outstanding disadvantages such as large solvent consumption, heavy environmental pollution, high toxicity, and volatile and difficult to popularize and use.
Japanese patent JP2000-273302A discloses a kind of preparation method of the polyimide dispersion solution of high storage stability and film-forming process thereof, but the main problem of this method is to still use the organic solvent (xylene, ethyl alcohol) of a large amount of non-solvents Glycol ethyl ether, cyclohexanone, etc.) to disperse polymer particles; so far, there is no report about the preparation method of polyimide high temperature resistant water-based dispersion coating in the Chinese patent database and related literature, world-renowned enterprises such as DuPont , GE, ICI and other companies have not seen similar product releases

Method used

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  • Polyimide thermostable aqueous dispersion coating material and preparation method and use thereof
  • Polyimide thermostable aqueous dispersion coating material and preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Under the conditions of nitrogen protection and mechanical stirring, in a 250ml three-necked flask, add 3.44g (10mmol) 2,2'-benzidine disulfonic acid (BDSA), 10ml m-cresol and 2.4g (24mmol) triethylamine . After BDSA is completely dissolved, add 1.0g (5mmol) 4,4'-diaminodiphenyl ether (ODA), 4.02g (15mmol) 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA) and 2.562 g (21 mmol) benzoic acid. After the mixture was stirred at room temperature for several minutes, it was heated to 80°C for 4 hours, and then heated to 180°C for 20 hours. After the reaction was finished, it was cooled to 100° C., and then 100 ml of m-cresol was added to reduce the high viscosity of the solution, which was then poured into 500 ml of acetone. The fibrous precipitate was filtered out, and after repeated purification with alcohol, hydrochloric acid and water, it was dried in vacuum to obtain solid polyimide powder. Dissolve the above polyimide powder with N, N'-dimethylformamide (DMF), th...

Embodiment 2

[0027] Same as Example 1, but the difference is that the step of direct sulfonation of polyimide is canceled. The room temperature storage stability of waterborne polyimide high temperature resistant coatings is shown in Table 2.

Embodiment 3

[0029] Same as Example 1, but the consumption of 2,2'-benzidine disulfonic acid becomes 4.128g (12mmol), and 4,4'-diaminodiphenyl ether becomes 0.6g (3.0mmol). The room temperature storage stability of waterborne polyimide high temperature resistant coatings is shown in Table 2.

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Abstract

The invention pertains to the technical field of coating combination, in particular relates to a polyimide water dispersing coating that is resistant to high temperature as well as a preparing method and application of the coating. The water dispersing coating is prepared by the following method: cocondensed polyimide is cocondensed and polymerized by diamine and binary anhydride, then hydrophilic polyimide is prepared by such chemical modifying means as sulphofication or carboxylation, etc. For the polyimide, the proportion of sulphonic acid and carboxylic acid in the polymer can be blended as necessary, or blocks of special feature can be added to get aromatic polyimide with desired performance; and then the desired hydrophilic polyimide dispersing coating can be obtained by such technology as hi-speed crushing, dispersing and stabilizing, etc. After casting the dispersing coating, a polymer film resistant to high temperature with good surface condition can be obtained. The dispersing coating overcomes the difficulties associated with prior hydrophilic polymer coating such as low application temperature, high cost of fluorine-contained coating, and high toxicity in organic solvent, and is of a very wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of paint compositions, and in particular relates to a polyimide high-temperature-resistant aqueous dispersion paint and a preparation method and application thereof. Background technique [0002] In recent years, water-based coatings have the advantages of low energy consumption, no pollution, high environmental protection and high performance, which represent the main direction of coating development and are one of the current global research and development hotspots. Among them, the most researched in this field is water-based polyurethane resin, etc., but the long-term service temperature of its coating film is only about 150°C; The temperature resistance of propylene and various copolymers comes from the fluorine atoms in the side chains, which is costly and harmful to the human body, and the production process of fluorine-containing resins has certain harm to the environment; Sulfone is treated with di...

Claims

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Application Information

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IPC IPC(8): C09D179/08C08G73/10
Inventor 杨正龙浦鸿汀
Owner TONGJI UNIV