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Novel light-wave absorbing carbon fiber composite material preparation method

A composite material, carbon fiber technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of complex process, limited application, expensive price, etc., and achieve the effect of simple process, good wave absorption effect, and simple preparation process

Inactive Publication Date: 2007-05-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although special carbon fiber has good microwave absorption performance, its high price and complicated process limit its application.

Method used

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  • Novel light-wave absorbing carbon fiber composite material preparation method
  • Novel light-wave absorbing carbon fiber composite material preparation method

Examples

Experimental program
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Effect test

example 1

[0017] Get 100 grams of viscose-based fiber, with 2000 milliliters of 10% (NH 4 ) 2 SO 4 Soak in solution, dry at room temperature, carbonize in air at 350-400°C; put the carbonized fiber into a rotary activation furnace, -2 Pa low vacuum, 900 ~ 950 ℃, pass water vapor into the activation furnace and keep it warm for 10 minutes, take out the carbon fiber, and obtain the activated carbon fiber with special-shaped cross-section and high specific surface area, and make the obtained activated carbon fiber into a length of 20 mm for later use .

[0018] Weigh 100g of E-44 (6101) type epoxy resin and 1.1g of activated short carbon fiber, and stir thoroughly after mixing. Weigh 50 g of low-molecular-weight polyamide, add it to the aforementioned mixture, and stir again until it is evenly mixed, and use this mixture as the wave-absorbing layer in the wave-absorbing plate. Pour an appropriate amount of the mixture into the mold so that the mixture can evenly cover the bottom and ev...

Embodiment 2

[0020] A composite material with a gradient distribution of carbon fiber content was prepared, in which the wave-absorbing layer was prepared in the form of layered casting, and the carbon fiber content of each layer decreased in turn. Using the same method as in Example 1, the short carbon fibers were fully mixed with epoxy resin and curing agent. A four-layer structure is adopted, and the content of short carbon fibers in each layer is 1%, 0.75%, 0.5% and 0.25%, respectively. Cast in layers in the mold, cure at 10MPa, 80°C for about three hours, and demould to obtain the gradient absorbing composite material.

Embodiment 3

[0022] Weigh 200g of E-44 type epoxy resin, mix it with 3g of active short carbon fiber and stir thoroughly. Weigh 100g of low-molecular-weight polyamide, add it to the original mixture, and stir again until the resin, curing agent and carbon wool are evenly mixed. Put this mixture into an appropriate mold, apply a pressure of about 10MPa, and cure it at 80°C for about three hours, and then demould to obtain a wave-absorbing composite material.

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Abstract

The invention discloses a novel light-wave absorbing carbon fiber composite material preparation method which comprises, subjecting cellulose viscose to carbonization and activation, obtaining active adhesive based carbon fiber, making the active carbon fiber to 5-50mm short carbon fiber, charging into bisphenol type A epoxy resin, mixing homogeneously, mixing with low-molecular-weight polyamide curing agent, finally agitating homogeneously and hot-setting.

Description

technical field [0001] The invention relates to a preparation method of a novel wave-absorbing material, which belongs to the preparation technology of the wave-absorbing material. Background technique [0002] Carbon fiber is one of the more commonly used fibers for absorbing materials. It has been reported in the literature at home and abroad that ordinary carbon fiber has strong reflectivity to electromagnetic waves, and its reflection attenuation effect is similar to that of aluminum alloy. In order to improve the microwave-absorbing performance of carbon fibers, the commonly used method is to modify carbon fibers to prepare special absorbing carbon fibers. This research is currently focused on carbon fibers with special-shaped cross-sections, low-temperature firing carbon fibers with a specific range of conductivity, and carbon fibers. Doping modification and surface modification. In previous studies, the inventors used a special arrangement method to improve the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/08C08J5/06C09K3/00
Inventor 师春生邹田春赵乃勤杜希文李家俊
Owner TIANJIN UNIV