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Novel fire resistant polyimide foam and method of producing the same

A technology of polyimide and high temperature resistance, which is applied in the field of novel high temperature resistant polyimide foam and its preparation, can solve problems such as inability to meet requirements, and achieve the effects of improving heat resistance and simple preparation process

Active Publication Date: 2009-04-08
SHENZHEN HIFUTURE ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this foam still cannot meet the requirements of some special high-temperature fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a one-necked flask, 5.884g (0.02mol) a-BPDA was added to 36g methanol, followed by 0.3g 2-ethyl-4-methylimidazole, and heated at reflux at 70°C for 2h to obtain 2,3,3',4 '-biphenyl dioic acid diester (a-BPDE) in methanol, which was then cooled to room temperature. Dissolve 1.946g (0.018mol) of p-phenylenediamine (p-PDA) in 20g of methanol, add it to the methanol solution of a-BPDE cooled to room temperature, and react under magnetic stirring for 6 to 8 hours, then add 0.773g (0.004mol) 4-phenylacetylene aniline (4-PEA) capping, after reacting for 3 hours to 4 hours, add 0.086g polymethylsiloxane, and add 16.421g methanol, adjust the solid content of the precursor solution to 10 wt%, continue to react for 1 to 2 hours to obtain a precursor solution, then dry and grind at 70°C to obtain a polyimide foam precursor powder.

[0032] Put 1.3g of the above-mentioned precursor powder into a high-temperature resistant microporous breathable mold. The mold is in the shape of ...

Embodiment 2

[0034] Put 2.6g of the precursor powder prepared in Example 1 into a high-temperature-resistant microporous breathable mold. The mold is in the shape of a cube, and the cavity size is 50mm×50mm×13mm. Put the mold into a high-temperature heating furnace, and the room temperature rises. After reaching 360° C., keep warm for 1 hour, and obtain a high-temperature-resistant polyimide foam after cooling.

Embodiment 3

[0036] Put 5.2 g of the precursor powder prepared in Example 1 into a high-temperature-resistant microporous breathable mold. The mold is in the shape of a cube, and the cavity size is 50mm×50mm×13mm. Put the mold into a high-temperature heating furnace, and the room temperature rises. After reaching 360° C., keep warm for 1 hour, and obtain a high-temperature-resistant polyimide foam after cooling.

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PUM

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Abstract

The invention relates a novel high temperature resistant polyimide foam and the preparation process thereof is as follows: (1) firstly, 2, 3, 3', 4'-biphenyl tetracarboxylic dianhydride or 2, 3, 3', 4'-biphenyl tetracarboxylic dianhydride and another type of aromatic dianhydride are heated and refluxed in a fatty alcohol solution so as to change the tetracarboxylic dianhydride into diacid diester; (2) in accordance with a certain proportion, the obtained diacid diester is synthesized into a precursor solution with one type or more of aromatic diamine and a blocking agent of acetylenyl benzene and a certain quantity of foam stabilizer is added into the solution; (3) the solution is heated to remove tiny molecule volatile matter and obtain a polymide precursor powder; and (4) the precursor powder is filled into a mould to be frothed at high temperature and carries out imidization so as to obtain the polyimide foam. The density of the novel high temperature resistant polyimide foam is 10 kg / m<3> to 500 kg / m<3> and the vitrified transformation temperature is over 350 DEG C; and the foam is characterized by excellent high temperature resistance, low temperature resistance, mechanical properties and functions of anti flaming, heat insulation or noise reduction.

Description

technical field [0001] The invention relates to a novel high temperature resistant polyimide foam and a preparation method thereof. Background technique [0002] Compared with traditional foam materials such as polystyrene, polyethylene, and polyurethane foam, polyimide foam has excellent flame retardancy, outstanding high and low temperature resistance, and good dimensional stability. Therefore, polyimide foam material, as a member of the polyimide material family, has attracted widespread attention since the Dupont company began to develop it in the 1960s, and has developed rapidly. It has been widely used in aircraft, aerospace For example, some countries have used it as insulation material for low-temperature storage tanks of spacecraft, impact-absorbing pads for protective helmets, electromagnetic window wave-transmitting materials for radar radomes, and aircraft corridor structures. materials etc. [0003] The preparation method of polyimide foam material is more at ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08G73/12C08J9/00
Inventor 詹茂盛潘玲英王凯
Owner SHENZHEN HIFUTURE ELECTRIC
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