Foamed epoxy adhesive film, aramid fiber honeycomb sandwich panel, and preparation method of aramid fiber honeycomb sandwich panel

A technology of aramid honeycomb and epoxy glue, which is applied in the direction of chemical instruments and methods, layered products, weight reduction, etc. It can solve the problems of synchronous curing, low strength of foam materials, and many molding processes, so as to avoid manual investment , The weight can be adjusted to avoid damage

Active Publication Date: 2020-02-28
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, foaming materials are filled around the paper honeycomb sandwich panel, and a waterproof coating layer is provided on the surface, but the foaming material filled in the sandwich panel is polyurethane or polyester resin with low strength, and it cannot be compatible with the paper honeycomb sandwich panel. Simultaneous curing, more molding processes

Method used

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  • Foamed epoxy adhesive film, aramid fiber honeycomb sandwich panel, and preparation method of aramid fiber honeycomb sandwich panel
  • Foamed epoxy adhesive film, aramid fiber honeycomb sandwich panel, and preparation method of aramid fiber honeycomb sandwich panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Stir 100 parts of bisphenol A epoxy resin, 10 parts of dicyandiamide, 3 parts of azodicarbonamide, and 50 parts of N, N-dimethylformamide at 80 ° C, vacuum defoaming; Continuous and uniform coating of epoxy resin mixture at 220g / m 2 On the aramid felt (the mass ratio of aramid 1313 fiber to aramid 1414 fiber is 1.5:1); the aramid felt is pulled into the drying tunnel, and after baking at 120°C for 4 hours, a foamed epoxy film is obtained, and the foamed epoxy film is tested. Gram weight of the film. The compressive strength and bending strength of the aramid honeycomb sandwich panel made of aramid honeycomb sandwich panel after being cured for 4 hours under the condition of 180℃ / 0.2MPa are shown in Table 1 (Note: HB7736.2 is used for surface density) -2004 test, compressive strength is tested using GB1447-2005, bending strength is tested using GB1449-2005.).

Embodiment 2

[0041] Stir 100 parts of bisphenol F epoxy resin, 15 parts of 4,4-diaminodiphenyl sulfone, 7 parts of sodium bicarbonate, and 80 parts of N,N-dimethylformamide at 80°C, and vacuum defoam; Continuously and evenly coat the epoxy resin mixture at 330g / m on the film coating machine 2 On the aramid felt (the mass ratio of aramid 1313 fiber to aramid 1414 fiber is 1.2:1); the aramid felt is pulled into the drying tunnel, and after baking at 150°C for 4 hours, a foamed epoxy film is obtained, and the foamed epoxy film is tested. Gram weight of the film. The compressive strength and flexural strength of the aramid honeycomb sandwich panel made of foamed epoxy film after curing for 4 hours at 180°C / 0.2MPa are shown in Table 1.

Embodiment 3

[0043] Stir 100 parts of bisphenol F epoxy resin, 15 parts of 4,4-diaminodiphenylsulfone, 10 parts of n-pentane, and 100 parts of N, N-pyrrolidone at 80 ° C, vacuum defoaming; Continuous and uniform coating of epoxy resin mixture at 330g / m 2 On the aramid felt (the mass ratio of aramid 1313 fiber to aramid 1414 fiber is 1.2:1); the aramid felt is pulled into the drying tunnel, and after baking at 120°C for 4 hours, a foamed epoxy film is obtained, and the foamed epoxy film is tested. film. The compressive strength and flexural strength of the aramid honeycomb sandwich panel made of foamed epoxy film after curing for 4 hours at 180°C / 0.2MPa are shown in Table 1.

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Abstract

The invention discloses a foamed epoxy adhesive film, an aramid honeycomb sandwich panel and a preparation method of the aramid honeycomb sandwich panel. The preparation method comprises the followingsteps: mixing epoxy resin, a curing agent, a foaming agent and a solvent to obtain a foamed epoxy resin; uniformly coating an aramid fiber felt with the foamed epoxy resin; and drying the aramid fiber felt to remove the solvent to obtain the foamed epoxy adhesive film; and sealing the side edges of an aramid honeycomb core by using the foamed epoxy adhesive film, and then curing to prepare the aramid fiber honeycomb sandwich panel. The foamed epoxy adhesive film is reinforced by the aramid felt with a loose structure, the weight is light and adjustable, the weight of the aramid fiber honeycomb sandwich panel cannot be greatly increased, the aramid fiber felt is a three-dimensional reinforcement, a large number of benzene rings exist in the molecular structure, and the strength of the cured adhesive film is high; the foamed epoxy adhesive film is a medium-temperature curing system and can be trimmed after being synchronously cured with the aramid fiber honeycomb sandwich panel, and manual input caused by putty blade coating is avoided.

Description

technical field [0001] The invention relates to a foamed epoxy adhesive film for edge sealing of an aramid honeycomb sandwich panel, an aramid honeycomb sandwich panel and a preparation method thereof. Background technique [0002] Aramid honeycomb sandwich panels are widely used in load-bearing and secondary load-bearing structures in aviation, aerospace, and orbital fields due to their high strength, high stiffness, flame retardancy, sound insulation, and good environmental performance. The untreated aramid honeycomb sandwich panel is easy to absorb moisture in long-term humid environment, which will adversely affect the weight, size and interface bonding performance of the sandwich panel. At present, the edge banding technology of aramid honeycomb sandwich panels mostly adopts aluminum profile edge banding, scraping putty, and filling foam materials. [0003] Chinese patent CN103590532A discloses an edge-sealing structure and edge-sealing method of a honeycomb sandwich c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/10C08J9/08C08J9/14C08J5/18C08L63/00C08L77/10B32B3/12B32B27/34B32B27/02B32B27/06B32B3/08B32B33/00
CPCC08J9/0061C08J9/103C08J9/08C08J9/141C08J5/18B32B3/12B32B5/02B32B3/08B32B33/00C08J2363/00C08J2477/10C08J2203/02C08J2203/04C08J2203/14B32B2262/0269Y02T50/40
Inventor 贾金荣李赛吕保杰吴东森谢孔静裴海帆刘含茂程海涛
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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