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Polyimide foam and preparation method thereof

A polyimide and foam technology, applied in the field of polymer materials, can solve the problems of complicated reaction and insufficient flexibility of foam, and achieve the effect of improving foam performance, increasing flexibility and low density

Inactive Publication Date: 2013-08-07
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

However, the added methanol and water promote foaming, which complicates the reaction with isocyanate, and the prepared foam is not flexible enough

Method used

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  • Polyimide foam and preparation method thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of polyimide foam, it is characterized in that, comprises:

[0030] A) diamine and dianhydride are reacted in a solvent to obtain a first solution;

[0031] mixing dianhydride, foaming agent, catalyst and surfactant in a solvent to obtain a second solution;

[0032] B) mixing the first solution and the second solution, adding polyphenylpolymethylene polyisocyanate solution, stirring and foaming to obtain a foam intermediate;

[0033] C) Imidating the foam intermediate to obtain polyimide foam.

[0034] In the present invention, diamine and dianhydride are first reacted in a solvent to obtain a first solution. The molar ratio of the diamine to the dianhydride is preferably 1:0.95-1.05; the solid content of the first solution is preferably 9%-11%. The reaction temperature is preferably 20°C-30°C, and the reaction time is preferably 5-8h.

[0035] In the present invention, the dianhydride in the first solution is pref...

Embodiment 1

[0056] Weigh 8.400g (0.042mol) of 4,4'-diaminodiphenyl ether and add it to 187g of N,N'-dimethylformamide solution. After stirring and dissolving, add 12.349g (0.042mol) of 4,4 '-biphenyltetracarboxylic dianhydride, stirred at room temperature for 7 hours to obtain a first solution with a solid content of 10%.

Embodiment 2

[0058] 124g of 4,4'-benzophenone tetracarboxylic dianhydride, 10g of methanol, 12g of deionized water, 17g of DC-193, 6.5g of PEG, 0.1g of triethanolamine and 0.1g of dibutyltin dilaurate were added to 120g of N, In the N'-dimethylformamide solution, stir and dissolve evenly at room temperature to obtain the second solution.

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Abstract

The invention provides a preparation method of polyimide foam. The method comprises the steps of reacting diamine with dianhydride in a solvent to obtain a first solution; mixing the dianhydride, a foaming agent, a catalyst and a surfactant in a solvent to obtain a second solution; mixing the first solution with the second solution, adding polyaryl polymethylene polyisocyanate dissolved in a solvent, stirring and foaming to obtain a foam intermediate; and carrying out imidization on the foam intermediate to obtain the polyimide foam. According to the invention, a novel polymer with a semi-interpenetrating network structure, which is formed by linear polyamide acid and crosslinked polyamide acid, is provided; due to the introduction of the linear polyamide acid, the defect that the crosslinked polyimide foam made from polyisocyanate and dianhydride is insufficient in flexibility is remedied; the foam property is improved through changing the body structure, so that the material flexibility is increased while the heat stability can be kept; and the polyimide foam obtained by adopting the preparation method provided by the invention is simple in process and low in density.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyimide foam and a preparation method thereof. Background technique [0002] Polyimide is a kind of polymer whose repeating unit is characterized by imide group, and it is one of the organic polymer materials with the best comprehensive performance. It has the characteristics of good heat resistance, radiation resistance, corrosion resistance, good mechanical properties and electrical properties, and has been widely used in aerospace, military and electronics fields. Polyimide foam not only maintains the high temperature resistance and flame retardancy of polyimide, but also has excellent high temperature barrier properties, noise reduction and wave transmission properties, as well as light weight, good flexibility and resilience, and convenient use. , can be used as thermal insulation materials in the fields of aircraft, spacecraft, weaponry, ships, high-speed tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J9/04C08L79/08
Inventor 陈文慧郭海泉董志鑫杜志军邱雪鹏高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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