Modified polyimides foam and preparation thereof

A technology of polyimide and foam, which is applied in the field of modified polyimide foam and its preparation, and can solve problems such as high preparation cost, unfavorable industrial production, and restrictions on popularization and application

Active Publication Date: 2009-04-15
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain modified polyimide foam, the process route of this method is long, the preparatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 50.8 grams of 1,2,4,5-pyromellitic anhydride into 80 grams of dimethylformamide and stir well until all the 1,2,4,5-pyromellitic anhydride solids are dissolved and the solution becomes After clarification, 6 grams of anhydrous methanol, 3 grams of polyethylene glycol-600, and 4 grams of aminosiloxane were added. After the temperature of the solution naturally drops below 50°C, add 5 grams of deionized water, 11 grams of surfactant AK-168, 0.8 grams of triethylenediamine, and 0.3 grams of dibutyltin dilaurate, and stir the above solution to a constant temperature. A pink viscous modified foam precursor solution was obtained.

[0024] Measure 25 grams of the modified foam precursor solution, and quickly stir it with 20 grams of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold and foam freely for 10-20 seconds. After debonding, put it into a microwave equipment to set the shape for 30-45 minutes to ob...

Embodiment 2

[0032] Put 50.8 grams of 1,2,4,5-pyromellitic anhydride into 80 grams of dimethylformamide and stir well until all the 1,2,4,5-pyromellitic anhydride solids are dissolved and the solution becomes After clarification, 6 grams of anhydrous methanol, 3 grams of polyethylene glycol-600, and 3 grams of hydroxyl-terminated siloxane were added. After the temperature of the solution naturally dropped below 50°C, 5 grams of deionized water, 11 grams of surfactant DC193, 0.8 grams of triethylenediamine, and 0.3 grams of dibutyltin dilaurate were added. Stir the above solution to a constant temperature to obtain a pink viscous modified foam precursor solution.

[0033] Measure 25 grams of the modified foam precursor solution, and quickly stir it with 22 grams of isophorone diisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold and let it foam freely for 5-10 seconds. After the foam is debonded Put it in a microwave equipment for 20-40 minutes to get th...

Embodiment 3

[0041] Put 49.8 grams of 3,3',4,4'-benzophenone tetra-acid dianhydride into 100 grams of dimethylformamide, stir well, gradually heat to 120°C, stay for 20 minutes, then cool down to below 80°C, Add 9.8 grams of anhydrous methanol, 4.5 grams of polyethylene glycol-1000, and 4.5 grams of hydroxyl-terminated siloxane. When the temperature of the solution naturally drops below 45°C, add 8 deionized water, 12 grams of AK-168, 0.5 grams of triethanolamine, and 0.2 grams of stannous octoate to the above solution in sequence, and stir the above solution to a constant temperature to obtain a light brown modified foam precursor solution.

[0042] Measure 25 grams of the modified foam precursor solution, and quickly stir it with 23 grams of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold and foam freely for 8-15 seconds. After debonding, put it in a microwave equipment for setting for 1 hour to obtain a modified foam ...

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Abstract

The invention discloses modified polyimide foam and a preparation method thereof. The preparation method comprises the following steps: aromatic dianhydride and/or aromatic acid ester, siloxane with active terminal group, low molecular alcohol, a catalyst and a surface active agent are mixed into a polar solvent according to proportion and react to form foaming precursor solution which reacts with isocyanate to form foaming intermediate solution; and the foaming intermediate solution carries out foaming freely in a mold and forms a modified foaming intermediate which is radiated by microwave or/and heated and cured in an oven, and then the solid polyimide foam is obtained. The method has short route of preparation process and simple technique; the foaming precursor solution has good stability of storage, is suitable for the processing techniques of casting, painting, extruding and the like, and the defects of broken foam, parallel foam, depression and incomplete imidizate of materials do not occur; the polyimide foam has even aperture, high stability, low rigidity, good flexibility and good processability; and the preparation cost is low, thus being convenient to promotion and application.

Description

Technical field [0001] The invention relates to the field of polymer materials, in particular to a modified polyimide foam and a preparation method thereof. technical background [0002] As we all know, polyimide has many advantages such as high and low temperature resistance, radiation resistance, high mechanical strength, etc., but with the development of society and technology, the demand for polyimide is increasing, and its performance requirements As it gets higher and higher, its disadvantages such as strong molecular rigidity, insolubility and infusibility, difficulty in processing and molding, and high cost are becoming increasingly prominent. The performance of the reaction on the polyimide foam is: although the foam shows good flexibility as a whole, due to the strong molecular rigidity, the foam will be crushed, cracked and slag-dropped during processing and under repeated pressure. , Bringing troubles to production and construction. Therefore, it is necessary t...

Claims

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Application Information

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IPC IPC(8): C08J9/02C08L79/08C08G73/10
Inventor 王连才曾心苗鲍矛周成飞张艳霞
Owner BEIJING RADIATION APPL RES CENT
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