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Full-polyimide foam honeycomb and manufacturing method thereof

A technology of all-polyimide and polyimide honeycomb paper, which is applied in the direction of textiles and papermaking, can solve the problems of reduced service life of aramid paper honeycomb core, and achieve the advantages of increasing strength, maintaining rigidity, and outstanding compressive performance Effect

Inactive Publication Date: 2016-03-02
CHANGCHUN HIPOLYKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in extreme weather, the service life of the aramid paper honeycomb core will be reduced

Method used

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  • Full-polyimide foam honeycomb and manufacturing method thereof

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preparation example Construction

[0030] The present invention also provides a kind of preparation method of polyimide foam honeycomb, it is characterized in that, comprises the following steps:

[0031] A) after polyimide paper is processed, obtain polyimide paper honeycomb core;

[0032] B) adding the polyimide foam precursor into the honeycomb holes of the polyimide paper honeycomb core obtained in the above step A), and heating and foaming to obtain a polyimide foam honeycomb.

[0033] In the present invention, polyimide paper is first processed to obtain a polyimide paper honeycomb core; the present invention has no special restrictions on the processing, and the polyimide paper is molded with the process known to those skilled in the art. The process is enough. In order to improve the characteristics of the polyimide foam honeycomb, the present invention preferably includes the steps of gluing, hot pressing, stretching, dipping, shaping and slicing.

[0034] The steps of gluing, hot pressing and stretch...

Embodiment 1

[0043] First, the surface of the polyimide paper is coated with polyimide glue, and then multi-layers are stacked according to the shape of the honeycomb core, then preheated at 80°C for 50 minutes, and then gelled at 130°C for 100 minutes, and finally Cured at 240°C for 4 hours under the condition of hot pressing pressure of 6MPa. The above-mentioned hot-pressed polyimide paper was stretched by a stretching machine at a stretching speed of 12 mm / min, and then dried in an oven at 300° C. for 40 minutes to obtain a polyimide paper with a honeycomb structure.

[0044] Then, the polyimide paper with honeycomb structure obtained in the above steps is dipped in a dipping machine, and the dipping solution is composed of 10 wt% polyimide resin and dimethylacetamide. After dipping, preheat in an oven at 75°C for 30 minutes, then dry at 130°C for 100 minutes, gel at 210°C for 3 hours, and finally cure at 370°C for 4 hours, then cut into slices to obtain a side length of 6mm and a size ...

Embodiment 2

[0049] First, the surface of the polyimide paper is coated with polyimide glue, and then multi-layers are stacked according to the shape of the honeycomb core, then preheated at 75°C for 40 minutes, and then gelled at 135°C for 120 minutes, and finally Curing at 200°C for 3 hours under the condition of hot pressing pressure of 7MPa. The hot-pressed polyimide paper was stretched with a stretching machine at a stretching speed of 10 mm / min, and then dried in an oven at 320° C. for 30 minutes to obtain a polyimide paper with a honeycomb structure.

[0050] Then, the polyimide paper with honeycomb structure obtained in the above steps is dipped in a dipping machine, and the dipping solution is composed of 30 wt% polyimide resin and dimethylacetamide. After dipping, preheat in an oven at 90°C for 40 minutes, then dry at 140°C for 90 minutes, gel at 240°C for 2 hours, and finally cure at 370°C for 5 hours, then cut into slices to obtain a side length of 6mm and a size of 50*50*10mm ...

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Abstract

The invention provides a full-polyimide foam honeycomb, formed by a polyimide paper honeycomb core and polyimide foam filled in honeycomb holes. Compared with the prior art, the material of the honeycomb core of the polyimide foam honeycomb is made of polyimide paper, foam material is polyimide, polyimide foam precursor is filled in the polyimide paper honeycomb core to form a full-polyimide structure, so as to fully develop advantage performance of the polyimide. The polyimide foam precursor is used to foam in situ in the honeycomb holes, special dimension relations and quality proportion are adjusted, and the polyimide foam precursor preferably combines with the honeycomb, and effectively keeps rigidity, flatness, and strength of the honeycomb core, so that integrated material of the foam honeycomb is light, and compressive property is outstanding. Under the condition of not improving integrated density of the material, strength of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of pulp molding technology, in particular to an all-polyimide foam honeycomb and a preparation method thereof. Background technique [0002] In recent years, pulp molded products have gradually replaced plastic molded products and foam molded products. Pulp molding is a three-dimensional papermaking technology. In the traditional sense, pulp molding uses waste paper as raw material, and then according to different uses, it is molded into various shapes of model products by special molds on the molding machine, which are used as Packaging liners for food, precision devices, glass, ceramic products, handicrafts, etc., so as to play a certain buffer protection performance. At present, most of the pulp molded products produced in my country are used as tableware and packaging materials, and the pulp raw materials are mostly waste paper, discarded wood and plant fibers, etc., so the products produced have always...

Claims

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Application Information

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IPC IPC(8): D21J5/00B29C44/18B29C44/34B29B11/14
CPCD21J5/00B29B11/14B29C44/186B29C44/34B29K2079/08B29C49/071B29C2949/0715
Inventor 谭红艳杨诚刘斌付饶于暴韩京成吕晓义
Owner CHANGCHUN HIPOLYKING
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