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Polyimide foam plastic and its preparation method

A technology of foam plastics and polyimide, which is applied in the direction of adhesives, etc., can solve the problems of poor overall uniformity of polyimide foam plastic foam and wide distribution of foam pore size, so as to achieve unaffected heat resistance and uniformity of cells Good, the effect of improving mechanical properties or flexibility properties

Active Publication Date: 2015-09-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the polyimide foam obtained by the above preparation method generally has the disadvantages of poor overall foam uniformity and wide foam pore size distribution.

Method used

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  • Polyimide foam plastic and its preparation method
  • Polyimide foam plastic and its preparation method
  • Polyimide foam plastic and its preparation method

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preparation example Construction

[0041] The invention discloses a preparation method of polyimide foam plastics, comprising the following steps:

[0042] 1a) Mix dianhydride and lower aliphatic alcohol and carry out esterification reaction to obtain diacid diester solution;

[0043] 1b) mixing the diacid diester solution obtained in step 1a) with polymerized monomer amine and polyamic acid powder to obtain a mixed solution;

[0044] 1c) Concentrating the mixed liquid obtained in the step 1b) followed by foaming and thermal imidization in order to obtain polyimide foam plastics.

[0045] In the present invention, in the preparation process of polyimide foam obtained by polymerization of dianhydride and diamine, polyamic acid powder is added in the preparation process of its foaming precursor, and polyamic acid powder is used as a foam nucleating agent to improve the polyimide foam. Cell uniformity of imide foam.

[0046] In the embodiment of the present invention, dianhydride and lower aliphatic alcohol are ...

Embodiment 1

[0124] Add 64.44g (0.20mol) of 4,4'-benzophenonetetracarboxylic dianhydride to 126g of methanol, heat to reflux for esterification reaction, and continue the reaction for 1 hour until the system is clear to obtain a diacid diester solution.

[0125] The temperature of the reaction system was lowered to room temperature, and 40.05 g (0.20 mol) of 4,4'-diaminodiphenyl ether was added, and the stirring reaction was continued for 1 hour to form a uniform mixed solution.

[0126] Concentrate the above mixed solution, then spread the obtained solid powder on an aluminum plate to form a 2mm powder layer, transfer it to an oven, and foam it at 160°C for 60 minutes to obtain a foamed polyimide intermediate brittle material, This brittle foam was pulverized to obtain polyamic acid powder.

[0127] Electron microscope analysis and infrared spectrum analysis are carried out to gained powder, and analysis result is as follows: figure 1 with figure 2 as shown, figure 1 It is an electron...

Embodiment 2

[0129] Add 29.42g (0.10mol) of 4,4'-biphenyltetracarboxylic dianhydride into 63g of methanol, heat to reflux for esterification reaction, and continue the reaction for 1 hour until the system is clear to obtain a diacid diester solution.

[0130] The temperature of the reaction system was lowered to room temperature, 20.02 g (0.10 mol) of 3,4'-diaminodiphenyl ether was added, and the stirring reaction was continued for 1 hour to form a uniform mixed solution.

[0131] Concentrate the above mixed solution, then spread the obtained solid powder on an aluminum plate to form a 2mm powder layer, transfer it to an oven, and foam it at 160°C for 60 minutes to obtain a foamed polyimide intermediate brittle material, This brittle foam was pulverized to obtain polyamic acid powder.

[0132] Electron microscope analysis and infrared spectrum analysis are carried out to gained powder, and analysis result is as follows: image 3 with Figure 4 as shown, image 3 It is an electron microg...

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Abstract

The invention provides a preparation method of polyimide foam plastic. The method comprises the steps as follows: firstly, after dianhydride is mixed with low-level aliphatic alcohol, an esterification reaction is performed, and a diacid diester solution is obtained; then the obtained diacid diester solution is mixed with polymerized monomer amine and polyamic acid powder to obtain a mixed solution; and finally, the obtained mixed solution is sequentially subjected to foaming and thermal imidization after concentration to obtain the polyimide foam plastic. The invention further provides the polyimide foam plastic and the preparation method thereof, and the method comprises the step that polyamic acid powder is added when dianhydride and isocyanate are used for preparing the polyimide foam plastic. According to the invention, the polyamide acid powder serves as a nucleating agent, so that a cell of an objected formed by foaming of polyimide is fine and smooth, that is, the size distribution of the cell is improved, the cell uniformity is better, then the flexibility performance and the like of the polyimide foam plastic are improved; meanwhile, the heat resistance is not influenced; and besides, the preparation method of the polyimide foam plastic is concise in processing, and low in energy consumption and production cost.

Description

technical field [0001] The invention relates to the technical field of polyimide, in particular to a polyimide foam plastic and a preparation method thereof. Background technique [0002] Polyimide is a polymer material with good heat resistance, radiation resistance, corrosion resistance and good mechanical properties and electrical properties. It is widely used in aerospace, military and electronics fields. Among them, polyimide foamed plastics are polyimide foamed plastics. This kind of foam not only maintains the temperature resistance of polyimide, but also has excellent high temperature barrier properties, noise reduction, impact resistance, dimensional stability and wave permeability. Moreover, polyimide foam plastics especially have good flame retardant performance, can be extinguished when away from the fire, no toxic gas and no smoke are produced during the combustion process, and can be used as heat insulation, sound insulation and flame retardant materials, such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C09J9/00C08L79/08
Inventor 郭海泉陈文慧杜志军邱雪鹏高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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