Preparation method for polyamide imide coating

A polyamide-imide and coating technology, which is applied in the field of coating material preparation, can solve the problems of no obvious improvement in the surface properties of the coating, reduced mechanical properties of the coating, etc., and achieves short synthesis time, improved thermal properties, The effect of good application prospects

Inactive Publication Date: 2015-11-04
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of PTFE can improve the surface properties of the coating, but reduce the mechanical properties of the coating. The addition of SiC does

Method used

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  • Preparation method for polyamide imide coating
  • Preparation method for polyamide imide coating
  • Preparation method for polyamide imide coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.01mol of pyromellitic anhydride and 0.09mol of trimellitic anhydride into the three-necked flask, then add 75ml of N-methylpyrrolidone and 10ml of xylene into the three-necked flask, heat to 80°C under nitrogen protection, stir for 30min, and wait for the pyromellitic After the acid anhydride and trimellitic anhydride are completely dissolved, add 0.1mol diphenylmethane diisocyanate, continue to stir at 80°C for 2.5h, then raise the temperature to 140°C, stir for 5h, then remove the three-necked flask and cool to room temperature. The obtained polymer solution was uniformly poured into deionized water containing 1% N-methylpyrrolidone, the polymer was precipitated, and the precipitated solution was replaced 5 times. Subsequently, the obtained tan solid was dried in a vacuum oven at 120°C for 24 hours to obtain a dried polymer. figure 1 It is the FTIR spectrum of the polymer, you can see 3353cm -1 It is N–H vibrational absorption peak, 1777cm -1 It is the extend...

Embodiment 2

[0033] Add 8mmol of pyromellitic anhydride and 0.092mol of trimellitic anhydride into the three-necked flask, then add 80ml of N-methylpyrrolidone and 15ml of xylene into the three-necked flask, heat to 80°C under nitrogen protection, stir for 30min, and wait for the pyromellitic anhydride to After completely dissolving with trimellitic anhydride, add 0.1mol diphenylmethane diisocyanate, continue to stir at 80°C for 3h, then raise the temperature to 140°C, stir for 5.5h, then remove the three-necked flask and cool to room temperature. The obtained polymer solution was uniformly poured into deionized water containing 1% N-methylpyrrolidone, the polymer was precipitated, and the precipitated solution was replaced 7 times. Subsequently, the obtained tan solid was dried in a vacuum oven at 120°C for 24 hours to obtain a dried polymer. 4 g of polyamide-imide was dissolved in 8 g of N-methylpyrrolidone treated with molecular sieves, and after complete dissolution, a polyamide-imide ...

Embodiment 3

[0037] Add 6mmol of pyromellitic anhydride and 0.094mol of trimellitic anhydride into the three-necked flask, then add 70ml of N-methylpyrrolidone and 15ml of xylene into the three-necked flask, heat to 80°C under nitrogen protection, stir for 30min, and wait for the pyromellitic anhydride to After completely dissolving with trimellitic anhydride, add 0.1mol diphenylmethane diisocyanate, continue to stir at 80°C for 3h, then raise the temperature to 140°C, stir for 6h, then remove the three-necked flask and cool to room temperature. The obtained polymer solution was uniformly poured into deionized water containing 1% N-methylpyrrolidone, the polymer was precipitated, and the precipitated liquid was replaced. Subsequently, the obtained tan solid was dried in a vacuum oven at 120°C for 24 hours to obtain a dried polymer. 4 g of polyamide-imide was dissolved in 4 g of N-methylpyrrolidone treated with molecular sieves, and after complete dissolution, a polyamide-imide coating with...

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Abstract

The present invention relates to a preparation method for a polyamide imide coating. The preparation method comprises: dissolving pyromellitic dianhydride and trimellitic anhydride in an aprotic polar solvent, after stirring and dissolving the pyromellitic dianhydride and the trimellitic anhydride under protection of nitrogen gas, adding diphenylmethane diisocyanate and stirring the solution to obtain a polyamide imide solution; carrying out solvent exchange to obtain a yellowish-brown solid; and drying the obtained yellowish-brown solid to prepare the polyamide imide coating. The method is simple, short in polymerization process time and easy in treatment, and does not need secondary operation for carrying out imidization; and the obtained polyamide imide coating is strong in adsorption capacity and excellent in thermal oxidation resistance, so that the production cost of the polyamide imide is further lowered and the preparation method has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of coating materials, in particular to a preparation method of polyamide-imide coating. Background technique [0002] In 1961, DuPont developed polypyromellitic imide, which set off an upsurge in polyimide research. As a new type of polyimide, the strength of polyamideimide is unmatched by any industrial unreinforced plastic in the world today. Its tensile strength exceeds 172MPa, and its heat distortion temperature is 274°C under a load of 1.8MPa. [0003] Polyimide materials have excellent chemical stability, excellent heat resistance and oxidation resistance, and outstanding mechanical properties, and are widely used in aerospace, fireproof materials, filter films, etc.; however, due to the rigid main chain of polyimide molecules The interaction with strong molecular chains leads to poor solubility of polyimides, which limits the processing properties of polyimides; therefore, the academic community...

Claims

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Application Information

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IPC IPC(8): C08G73/10C09D179/08
Inventor 胡祖明段广宇于俊荣诸静王彦
Owner DONGHUA UNIV
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