An insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection

A technology of insulation, heat conduction and ablation resistance, which is applied in the direction of adhesives, adhesive additives, epoxy resin glue, etc., can solve the problems that it is difficult to meet the requirements of lightning protection, the effect of lightning protection is far different, and the mechanical properties of composite materials are reduced. Achieve the effects of improving lightning protection, good insulation, and preventing conduction

Active Publication Date: 2017-12-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

The first three schemes mainly add conductive particles to the composite material. However, the aggregates generated during the dispersion of nanoparticles will lead to a decrease in the mechanical properties of the composite material, and it is difficult to repair after being damaged by lightning impact. Therefore, the fourth scheme is more suitable for Practical application, but it is still in the research stage at present. The method of attaching the conductive film to the surface of the composite material in the research is: laying the conductive film directly on the surface of the carbon fiber composite material prepreg, and then co-curing the conductive film and the prepreg.
Moreover, since the conductivity of the nano-carbon material conductive film is only 10 3 -10 5 On the order of S / m, it is still far below the conductivity of copper (~6.2×10 7 S / m), its lightning protection effect is far from that of the copper lightning protection layer, and it is difficult to meet the requirements of lightning protection

Method used

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  • An insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection
  • An insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection
  • An insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection

Examples

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Effect test

Embodiment 1

[0064] This example is used to illustrate the formulation, preparation method and application of the insulating, heat-conducting and ablation-resistant adhesive of the present invention in the direction of lightning protection.

[0065] (1) Bisphenol A type pure epoxy resin E51 (Wuxi Lanxing Chemical Resin Factory) is heated to 60°C in order to remove possible crystallized resin and reduce the viscosity of the resin, add 35.5g particle size approx. Hexagonal boron nitride particles of 5 μm (Shanghai Shuitian Science and Technology Materials Co., Ltd., ST-N-003-4), stirred at 5000rpm in a high-speed mixer (DISPERMAT AE) for 1h, after stirring and mixing, the obtained mixture was passed through a three-roll mill (EXAKT 80E) grinding to obtain a uniformly dispersed masterbatch;

[0066] (2) At 50-80°C, mix the masterbatch obtained in step (1) with an acid anhydride curing agent HE600 (mixture of methyl hexahydrophthalic anhydride and N,N-dimethylbenzylamine, mass ratio 100:1) mi...

Embodiment 2-7

[0071] This example is used to illustrate the formulation, preparation method and application of the insulating, heat-conducting and ablation-resistant adhesive of the present invention in the direction of lightning protection.

[0072] Carbon fiber composite parts for lightning tests were prepared according to the method of Example 1. The conductive films used were all multi-walled carbon nanotube conductive films with a thickness of 70 μm. The difference was that the content of epoxy resin in the adhesive was changed. , the content of boron nitride, and the thickness of the adhesive, the formula of the adhesive, the properties after curing, and the lightning protection effect statistics of the composite parts are shown in Table 1. The test pieces described in Examples 2-6 only have a large surface The wall carbon nanotube conductive film is damaged, but the interior of the carbon fiber composite part is not damaged, and the lightning protection effect is better.

[0073] The...

Embodiment 8

[0077] This example is used to illustrate the formulation, preparation method and application of the insulating, heat-conducting and ablation-resistant adhesive of the present invention in the direction of lightning protection.

[0078] (1) Heating four-functional epoxy resin 4,4'-diaminodiphenylmethane epoxy resin (MY721, Huntsman) to 60°C to remove possible crystallized resin and reduce the viscosity of the resin, to 100g of the epoxy resin Add 26.9g of alumina nanoparticles with a particle size of about 30nm (Shanghai Shuitian Science and Technology Materials Co., Ltd., ST-O-005-1), stir in a high-speed mixer (DISPERMAT AE) at 5000rpm for 1h, and mix the obtained The mixture is ground by a three-roll mill (EXAKT80E) to obtain a uniformly dispersed masterbatch;

[0079] (2) At 80°C, mix the masterbatch obtained in step (1) with curing agent Aradur917 and accelerator DY 070 according to the stoichiometric ratio. Stir in a mixer at a speed of 2000rpm for 30min, and then remov...

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Abstract

The invention belongs to the technical field of lightning protection, and relates to an insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection. The adhesive is mainly prepared from the following raw materials: 20-100% but not including 100% of a mixture of high temperature resistant resin and curing agent, and 0-80% but not including 0% of insulating, heat-conducting and ablation-resistant inorganic filler. After curing, the electrical conductivity of the adhesive is in the range of 10‑8‑10‑20S / m, the DC breakdown voltage in air is in the range of 30‑300kV / mm, and the thermal conductivity is in the range of 0.2‑3.0W / (m· Within the range of K), the ablation resistance temperature is as high as 3000°C. When the insulating, heat-conducting and ablation-resistant adhesive of a certain thickness (30‑250 μm) is used to paste the conductive film on the surface of the continuous carbon fiber laminated composite material part, it can prevent the conduction of the current to the continuous carbon fiber laminated composite material part and improve the conductive film. lightning protection.

Description

technical field [0001] The invention relates to an insulating, heat-conducting, ablation-resistant adhesive and its application in lightning protection, which can be used to improve the lightning protection effect of conductive films on the surface of carbon fiber composite parts, and belongs to the technical field of lightning protection. Background technique [0002] Continuous carbon fiber reinforced resin matrix composites, due to their high specific strength and specific modulus, low density, good fatigue resistance and corrosion resistance, are increasingly used in the aerospace field and can partially replace traditional metals. Base structure material to reduce weight and save fuel. For example, in the "Dreamliner" Boeing 787, carbon fiber composite materials account for up to 50% by weight. However, the non-conductivity of the resin matrix makes the conductivity of carbon fiber composites 10% worse than that of traditional metal materials. 6 -10 7 This makes the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J11/04B32B27/04B32B19/04B32B15/04B32B7/12B32B37/02
Inventor 韩金华张晖张忠
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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