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A chemical modification method and device for microwave and ultrasonic co-treatment of carbon fiber surface

A chemical modification and microwave ultrasonic technology, which is applied in ultrasonic/acoustic fiber treatment, fiber treatment, physical treatment, etc., can solve the problems of carbon fiber mechanical properties, single functional group, low reaction efficiency, etc., and achieve excellent treatment effect, The effect of low investment cost and simple operation

Inactive Publication Date: 2016-08-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical modification mainly includes (1) plasma treatment method, (2) anode electrolysis or electrodeposition treatment method, (3) high-energy radiation method, (4) surface oxidation treatment, etc. These methods have high treatment efficiency and can be used to a certain extent Improve the surface roughness of carbon fiber, increase the number of surface functional groups, and improve the wettability of carbon fiber surface, but there is a single functional group introduced, which has a great impact on the mechanical properties of carbon fiber
Chemical modification includes (1) surface graft modification, (2) coupling agent modification, etc. These methods can introduce specific functional groups to the surface of carbon fibers, which can react with the resin matrix, and the mechanical properties of carbon fibers after modification can be improved. , but there are problems of low reaction efficiency and low rate

Method used

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  • A chemical modification method and device for microwave and ultrasonic co-treatment of carbon fiber surface
  • A chemical modification method and device for microwave and ultrasonic co-treatment of carbon fiber surface
  • A chemical modification method and device for microwave and ultrasonic co-treatment of carbon fiber surface

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Experimental program
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Effect test

Embodiment 1

[0034] Step 1: Immerse carbon fiber (raw material is pitch fiber, form is prepreg) into acetone, ultrasonically disperse for 10h at 800W power, 40kHz frequency and 60°C temperature to remove the sizing agent in the carbon fiber, and then in Wash in deionized water for 12 hours, and finally vacuum-dry at 100°C and -0.1MPa vacuum for 4 hours to obtain carbon fibers after removing the sizing agent.

[0035] Step 2: Add the carbon fiber after removing the sizing agent in step 1 into concentrated nitric acid with a mass concentration of 69% at a mass ratio of 0.4:100, and ultrasonically treat it for 30 minutes at a power of 400W and a frequency of 40kHz. 100W microwave generator with a frequency of 2.45GHz irradiated for 40 minutes, then took out the carbon fiber and washed it with deionized water until the eluate was neutral, then dried the carbon fiber at 80°C and a vacuum of -0.1MPa for 4 hours, that is Acidified carbon fibers are obtained.

[0036] Step 3: Add the acidified ca...

Embodiment 2

[0038]Step 1: Soak the carbon fiber (the raw material is polypropylene base, in the form of fiber tow) in petroleum ether, ultrasonically disperse for 6 hours at a power of 600W, a frequency of 60kHz, and a temperature of 80°C to remove the sizing agent in the carbon fiber, and then Wash in deionized water for 10 hours, and finally vacuum-dry at 100°C and -0.1MPa vacuum for 4 hours to obtain carbon fibers after removing the sizing agent.

[0039] Step 2: Add the carbon fiber after removing the sizing agent in step 1 into concentrated nitric acid with a mass concentration of 63% at a mass ratio of 0.6:100, and ultrasonically treat it for 40 minutes at a power of 600W and a frequency of 80kHz. 200W microwave generator with a frequency of 2.45GHz irradiates for 40min, then take out the carbon fiber and wash it with deionized water until the eluate is neutral, then dry the carbon fiber at 80°C and vacuum degree of -0.1MPa for 4h, that is Acidified carbon fibers are obtained.

[0...

Embodiment 3

[0042] Step 1: Immerse carbon fiber (raw material is viscose yarn, in the form of fiber tow) in methanol, ultrasonically disperse for 3 hours at a power of 200W, a frequency of 80kHz, and a temperature of 80°C to remove the sizing agent in the carbon fiber, and then Wash in deionized water for 12 hours, and finally vacuum-dry at 100°C and -0.1MPa vacuum for 4 hours to obtain carbon fibers after removing the sizing agent.

[0043] Step 2: Add the carbon fiber after removing the sizing agent in step 1 into concentrated nitric acid with a mass concentration of 64% at a mass ratio of 1:100, and ultrasonically treat it for 40 minutes at a power of 400W and a frequency of 80kHz. A 300W microwave generator with a frequency of 10GHz irradiates microwaves for 20min, then takes out the carbon fiber and washes it with deionized water until the eluate is neutral, and then dries the carbon fiber at 80°C and a vacuum of -0.1MPa for 4h to obtain Acidified carbon fiber.

[0044] Step 3: Add ...

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Abstract

The invention discloses a chemical modification method and device for co-treating the surface of carbon fiber with microwave and ultrasonic. In the method, the carbon fiber is pretreated to remove the sizing agent in the carbon fiber; acidification treatment is carried out; the acidified carbon fiber is added to the chemical modification solution In the process, ultrasonic pre-dispersion, then adding reaction initiator, and carrying out microwave radiation, the chemical modification is completed. The device includes a water tank with a temperature control system, the water tank is provided with a cavity for chemical modification solution, the bottom of the water tank is provided with an ultrasonic generator, the upper part of the water tank is provided with a microwave-transmissible closing cover, and the upper part of the closing cover is provided There is a microwave generator. The invention has the advantages of low cost, simple operation, strong applicability, high efficiency, and excellent treatment effect. It can not only increase the surface roughness of carbon fibers, but also introduce specific reactive functional groups on the surface of carbon fibers, improve the wettability of carbon fiber surfaces, and increase the contact between carbon fibers and resins. The bonding strength improves the performance of carbon fiber composite materials.

Description

technical field [0001] The patent of the invention belongs to the technical field of carbon fiber surface modification, and relates to a chemical modification method and device for microwave ultrasonic co-treatment of carbon fiber surface. Background technique [0002] Carbon fiber is a fiber material with high specific strength and high specific modulus. It has a small thermal expansion coefficient, good low temperature resistance, and has a series of excellent properties such as fatigue resistance, creep resistance, and low friction coefficient. It is a resin-based material in recent years. The most important reinforcement material for composite materials. In recent years, research on carbon fiber has mainly focused on carbon fiber-reinforced resin-based composite materials. This composite material has a series of excellent properties such as high strength, high modulus, low density, and stable size. It has been widely used in aerospace, automobiles, and ships. , military...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/10D06M14/36D06M10/06D06M10/02
Inventor 段玉岗王奔李金键王宏晓
Owner XI AN JIAOTONG UNIV
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