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Preparation method of flexible polyimide foam material with regular cell structure

A technology of polyimide and foam materials, which is applied in the field of preparation of flexible polymer foam materials, can solve the problems of affecting the thermal insulation performance of foam materials and the destruction of lateral cell walls, so as to solve the problem of vertical co-bubble, improve thermal insulation performance and process Simple route effect

Active Publication Date: 2017-10-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyimide foam material prepared by the above-mentioned one-step preparation process has good flexibility, the vacuum pre-curing process often destroys the transverse cell wall, causing the occurrence of longitudinal bubble phenomenon, thereby forming a longer longitudinal penetration. Pores, to a certain extent, affect the thermal insulation performance of foam materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a 50ml three-neck flask, add 20g of N,N-dimethylformamide and 16.1g of BTDA and add a magnet, connect the reflux condenser to feed cooling water, put it into an oil bath and heat and stir to 55°C. Then the heating was stopped, and 3.2 grams of methanol and BTDA were dropped into the three-necked flask with a constant pressure dropping funnel to undergo esterification reaction. The dropping rate was 2-3 milliliters per minute, and the esterification reaction time was 2-3 hours. After the esterification reaction was complete and the solution became clear and transparent again, the electromagnetic stirrer stopped stirring, and the above solution was left to cool down to room temperature to obtain a nearly colorless carboxylate solution, which was stored away from light until use.

[0027] Add 10 g of PAPI to the above carboxylate solution, mix and stir for 20 minutes at room temperature and nitrogen atmosphere. Then put the above mixed solution into a vacuum box, slowly...

Embodiment 2

[0030] Prepare the same quality carboxylate solution and auxiliary agent mixed solution according to the recipe described in Example 1. Add 15 g of PAPI to the carboxylate solution, mix and stir for 30 minutes at room temperature and nitrogen atmosphere. Then put the above mixed solution into a vacuum box, slowly evacuate until the vacuum degree reaches 0.1 MPa, keep the vacuum until there are no more bubbles in the mixed solution, then release the pressure and take out the mixed slurry to obtain the foam A material.

[0031]Add the pre-configured additive mixture and 5 grams of PAPI to the above-mentioned foaming material A, stir the mixed slurry evenly with a mechanical stirring paddle, and pour it into the mold when the mixture starts to foam and lift up. Foaming. After the foam intermediate was left to stand at room temperature for 5 minutes, it was transferred to an electric blast drying oven preheated to 200° C. for 120 minutes to cure to obtain a flexible polyimide foa...

Embodiment 3

[0033] In a 50ml three-neck flask, add 15 grams of N,N-dimethylformamide and 10.9 grams of PMDA and add a magnet, connect the reflux condenser to feed cooling water, put it into an oil bath and heat and stir to 50°C. Heating was then stopped, and 3.2 grams of methyl alcohol and PMDA were dripped into a three-necked flask with a constant pressure dropping funnel for an esterification reaction at a rate of 2-3 milliliters per minute, so that the esterification reaction time was 2-3 hours. After the esterification reaction was complete and the solution became clear and transparent again, the electromagnetic stirrer stopped stirring, and the above solution was left to cool down to room temperature to obtain a nearly colorless carboxylate solution, which was stored away from light until use.

[0034] According to the recipe described in Example 1, the auxiliary agent mixed solution of the same quality was prepared.

[0035] 10 g of MDI-50 was added to the carboxylate solution, and ...

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PUM

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Abstract

The invention provides a method for preparing a flexible polyimide foam material with a regular cell structure. Firstly, polybasic aromatic anhydride and fatty alcohol are reacted to obtain polybasic aromatic anhydride derivative carboxylate solution, and then the carboxylate solution is mixed with a certain amount of isocyanate. The mixed solution is pre-polymerized at room temperature for a period of time, and then placed under vacuum to continue the polymerization reaction to obtain foam A material. Add a pre-prepared auxiliary agent mixture and a certain amount of isocyanate to the prepared foaming material A, and then carry out free foaming at room temperature to obtain a foam intermediate. The foam intermediate is cured at high temperature to obtain polyimide foam with good flexibility and regular cell structure. The flexible foam material prepared by the invention can realize three-dimensional 180° free folding without cracking; has excellent rebound performance, and can recover deformation quickly after the compression load is removed; and the cell structure is in a semi-closed cell state, uniform and regular.

Description

technical field [0001] The invention relates to a method for preparing a flexible polymer foam material, in particular to a new method for preparing a flexible polyimide foam material with a regular cell structure. Background technique [0002] Polyimide foam is a functional material with gas as the filling phase and polyimide as the matrix. The special physical and chemical structure makes it have excellent properties such as light weight, heat insulation, high and low temperature resistance, and flame retardancy. Therefore, compared with other foam materials, polyimide foam materials show obvious performance advantages and market competitiveness. The flexible polyimide foam material not only has the above-mentioned excellent properties of the polyimide foam material, but also exhibits excellent compliance, and can freely deform according to the shape of the laying carrier, which improves the practical application of this type of material. The flexibility of use reduces t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J9/08
Inventor 韩世辉孙高辉王文鹏刘连河魏浩王洪良
Owner HARBIN ENG UNIV
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