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A kind of preparation method of polyimide paper honeycomb core

A technology of polyimide paper and honeycomb core, which is applied in papermaking, cardboard articles, textiles and papermaking, etc., can solve the problems of use and cannot be used as a wave-transmitting material, and can expand the field of use, reduce permeability, and facilitate operation. Effect

Active Publication Date: 2016-02-24
山东芳磊复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the service temperature of aluminum honeycomb is high, it cannot be used as a wave-transparent material

Method used

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  • A kind of preparation method of polyimide paper honeycomb core
  • A kind of preparation method of polyimide paper honeycomb core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown, a kind of preparation method of polyimide paper honeycomb core, the cell size of this polyimide paper honeycomb core is 2.75mm, and density is 72kg / m 3 , the preparation method specifically includes the following steps:

[0032] (1) Use the polyimide fiber paper with a thickness of 0.08mm as the raw material paper to apply the glue with the glue roller dipped in the core strip glue, then stack the multi-layer glued raw paper in staggered layers, and finally use hot pressing Machine hot pressing to make honeycomb stack. The core strip glue is a high temperature core strip glue with a viscosity of 20s / 50ml. When hot pressing, first preheat at 70°C-100°C for 30min-60min, then gel at 120°C-160°C for 90min-150min, and finally cure at 170°C-190°C for 2h-5h, and the hot pressing pressure is 5MPa-7MPa.

[0033] (2) After stretching the honeycomb stack with a stretching machine at a stretching speed of 5mm / min-25mm / min, it is formed as figure 2 The r...

Embodiment 2

[0040] Such as figure 1 Shown, a kind of preparation method of polyimide paper honeycomb core, the cell size of this polyimide paper honeycomb core is 1.83mm, and density is 32kg / m 3 , the difference between the preparation method and Example 1 is:

[0041] The thickness of polyimide paper is 0.04mm. The viscosity of the high-temperature core strip glue used in step (1) of the preparation method of this embodiment is 35s / 50ml, and the number of dipping times in step (3) is one time.

Embodiment 3

[0043] Such as figure 1 Shown, a kind of preparation method of polyimide paper honeycomb core, the cell size of this polyimide paper honeycomb core is 3.67mm, and density is 40kg / m 3 , the difference between the preparation method and Example 1 is:

[0044] The thickness of polyimide paper is 0.05mm. The viscosity of the high-temperature core strip glue used in step (1) of the preparation method of this embodiment is 40s / 50ml, and the number of dipping times in step (3) is two times.

[0045] It should be noted that in the preparation method of the present invention, the type of honeycomb cell formed in the stretching process is not limited to the regular hexagon in Examples 1-3, and may also be rectangular, rhombus or flexible honeycomb. In the dipping solution, the selection of the organic solvent is not limited to that described in the examples. The hot press, dipping machine and stretching machine can all be selected from the corresponding equipment commonly used in thi...

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Abstract

The present invention relates to a method for preparing a polyimide paper honeycomb core, comprising the following steps: (1) coating, laminating, and hot-pressing raw-material paper to fabricate piled honeycomb blocks; (2) stretching the honeycombs, and performing high-temperature setting, to fabricate white honeycomb blocks; (3) dipping and curing the honeycomb blocks; and (4) slicing the dipped and cured honeycombs, characterized in that: the raw-material paper is polyimide paper. Because the polyimide paper is made of polyimide fiber, the polyimide paper inherits good properties of the polyimide fiber, and therefore, the prepared polyimide paper honeycomb core has better heat resistance, better dielectric performance, less fume toxicity, and better mechanical properties than an existing aramid paper honeycomb core; the polyimide paper honeycomb core has low water absorption, an application range thereof is expanded, and a service life of the honeycomb in a special environment is improved. The method of the present invention can use existing devices for manufacturing an aramid paper honeycomb core, and it is unnecessary to add new instruments or devices; the process procedures basically remain the same, the operation is convenient, and the device cost is not increased.

Description

technical field [0001] The invention relates to a preparation method of a honeycomb core, in particular to a preparation method of a paper honeycomb core. Background technique [0002] The honeycomb core refers to the core sandwiched between two skins in the honeycomb panel, which has a honeycomb-shaped cell as a whole. It is obtained by superimposing, pasting, stretching, dipping and curing of multi-layer plates, and has very high strength and rigidity. Common paper honeycomb cores, metal honeycomb cores, etc., and paper honeycomb cores are usually made of aramid paper, which has lighter weight, higher strength, hardness, and better softness. However, on the one hand, the maximum use temperature of aramid paper is around 200°C, which limits the high temperature resistance of the finished honeycomb core. On the other hand, aramid paper itself has strong polarity and is easy to absorb water because it contains amide groups. After the paper honeycomb is made into paper honey...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B31D3/02
CPCB31D3/0223D21H13/26
Inventor 隋广忠穆举杰刘玉杨洪
Owner 山东芳磊复合材料有限公司
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