Polyimide foam, and preparation method and application thereof

A technology of polyimide and bismaleimide, which is applied in the field of polymer materials, can solve the problems of foam heat resistance damage, low preparation efficiency, unfavorable industrial production, etc., achieve uniform cells, improve mechanical properties, Conducive to the effect of industrial production

Active Publication Date: 2019-06-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method often introduces too much aliphatic structure, which greatly damages the heat resistance of the foam. At the same time, the polyimide foam after chemical crosslinking needs to be kept under high temperature conditions ( >310°C), the post-curing temperature is higher, and a special mold is required, the preparation efficiency is very low, which is not conducive to industrial production

Method used

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  • Polyimide foam, and preparation method and application thereof
  • Polyimide foam, and preparation method and application thereof
  • Polyimide foam, and preparation method and application thereof

Examples

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preparation example Construction

[0044] According to a first aspect of the present invention, a kind of preparation method of polyimide foam is provided, comprising the following steps:

[0045] (A) providing the glue solution containing polyester ammonium salt oligomer, mixing the glue solution containing polyester ammonium salt oligomer with aromatic bismaleimide, and obtaining the foaming precursor after removing the solvent;

[0046] (B) Foaming the foaming precursor obtained in step (A), and then heat-treating to obtain a polyimide foam.

[0047] The source of the glue containing the polyester ammonium salt oligomer is not limited, and it can be prepared by a method commonly used by those skilled in the art. For example, the aromatic dianhydride is added into the mixed solvent of alcohol and ether, the aromatic dianhydride and the alcohol undergo esterification reaction, and then the aromatic diamine is added to obtain a glue solution containing polyester ammonium salt oligomer.

[0048] The types of ar...

Embodiment 1

[0083] A preparation method of polyimide foam, comprising the following steps:

[0084] (1) Provide glue containing polyester ammonium salt oligomer

[0085] Add 32.22g of 3,3',4,4'-benzophenonetetracarboxylic dianhydride (0.1mol) into a mixed solvent of 15g of methanol and 30g of tetrahydrofuran, under nitrogen protection, heat up to 60°C and reflux for 150min to obtain clarification After reducing the solution temperature to 30° C., 19.83 g of diaminodiphenylmethane (0.1 mol) was added, and the reaction was continued for 30 minutes to obtain a glue solution containing polyester ammonium salt oligomers.

[0086] (2) Preparation of foaming precursor

[0087] Add 5.7g of 4,4'-methylenebis(N-phenylmaleimide) to the glue containing polyester ammonium salt oligomer obtained in step (1), and continue to stir vigorously for 30min to obtain A homogeneous light brown transparent solution; the solution is concentrated and the foaming precursor is obtained after removing the solvent. ...

Embodiment 2-7

[0091] The difference between Examples 2-7 and Example 1 is that the amount of 4,4'-methylenebis(N-phenylmaleimide) in step (2) is different, as shown in Table 1 .

[0092] Table 1

[0093]

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Abstract

The invention provides a polyimide foam, and a preparation method and an application thereof, and belongs to the technical field of polymer materials. The preparation method of the polyimide foam comprises the following steps: uniformly mixing a glue solution containing a poly(ester-amine salt) oligomer with aromatic bismaleimide, and removing a solvent to obtain a foam precursor; and performing foaming, curing and heat treatment to obtain the polyimide foam. The crosslinking curing reaction of the aromatic bismaleimide and the imidation process of the polyimide in the method are carried out simultaneously, so the hybridization enhancement at the molecular scale is realized, an intertwined thermoplastic-thermosetting polymer chain network is formed, and the foam has good strength and toughness; the aromatic bismaleimide makes the cells of the obtained polyimide foam small and uniform, so mechanical properties of the polyimide foam are improved, and the heat resistance is kept; and theobtained polyimide foam has both good mechanical properties and good heat resistance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyimide foam and its preparation method and application. Background technique [0002] Polymer foam materials are widely used in construction, transportation, home furnishing, vehicles, insulating materials, packaging materials, electrical appliances, and sports facilities because of their light weight, good damping, high specific strength, heat insulation, sound absorption, and easy processing. , electronic products, chemical and textile industries, however, the biggest problem facing traditional polymer foams, such as polyethylene foam, polystyrene foam and polyurethane foam, is that they have low heat resistance and poor flame retardancy. The disadvantages limit the application of traditional polymer foams in extreme environments. [0003] As a high-performance foam, polyimide foam has excellent high and low temperature resistance (-200°C to 300°C), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/12C08J9/00
Inventor 王旭欧安平
Owner SICHUAN UNIV
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