Method of recovering carbon fibers by low-temperature microwave efficient treatment of carbon fiber composite material
A technology for recycling carbon fiber and composite materials, applied in the field of fiber composite materials, can solve the problems of pyrolysis gasification, easy carbonization of carbon fibers, and low oxygen content, etc., and achieve the effects of fast heating, energy saving, and high recovery efficiency
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[0038] Example 1
[0039] Such as figure 1 As shown, the low-temperature microwave efficient treatment of carbon fiber composite materials to recover carbon fibers, the specific steps are as follows: First, the waste carbon fiber composite materials (the carbon fiber form is short fiber, the matrix resin is epoxy resin, the size is 1.9×1.7×3cm) Enter the microwave heating device, enter oxygen (the oxygen intake is 4LPM), and feed the microwave with a frequency of 2450±50MHz until the temperature rises to 450°C, and low-temperature treatment for 0.1h to cause the resin organic matter to oxidize and decompose, and then naturally The temperature is lowered to below 200°C, and the solid product is taken out to be carbon fiber.
[0040] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into filamentous short carbon fibers, with a smooth and complete surface, and almost no resin residue.
Example Embodiment
[0041] Example 2
[0042] Such as figure 1 As shown, the low-temperature microwave high-efficiency treatment of carbon fiber composite materials to recycle carbon fibers, the specific steps are as follows: First, waste carbon fiber composite materials (the carbon fiber form is medium and long fiber, the matrix resin is epoxy resin, and the size is 5×5×2cm) Put in a microwave heating device, feed in oxygen (the oxygen feed is 0.5LPM), feed in microwaves with a frequency of 2450±50MHz, until the temperature rises to 450℃, low temperature treatment for 1 / 6h, so that the resin organics will undergo oxidation and decomposition reactions , And then naturally cool to the temperature below 200 ℃, take out the solid product is carbon fiber.
[0043] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into filamentous, filamentous medium-length carbon fibers, with a smooth and complete surface, basically no resin residue, and uniform sh...
Example Embodiment
[0044] Example 3
[0045] Such as figure 1 As shown, the low-temperature microwave high-efficiency treatment of carbon fiber composite materials to recover carbon fibers, the specific steps are as follows: First, waste carbon fiber composite materials (the carbon fiber form is medium and long fiber, the matrix resin is epoxy resin, the size is 15×10×2cm, Photo like figure 2 Shown) Put in a microwave heating device, feed in oxygen (the oxygen feed rate is 1.5LPM), feed in microwaves with a frequency of 915±50MHz, until the temperature rises to 450℃, low temperature treatment for 1 / 3h, so that resin organic matter Oxidation and decomposition reaction, and then the temperature is naturally cooled to below 200°C, and the solid product is taken out as carbon fiber.
[0046] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into filamentous carbon fiber with a filament length, as shown in the photo image 3 Shown from image 3 It...
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