Preparation method of chopped carbon fiber composite material

A technology of chopped carbon fiber and carbon composite materials, which is applied in the field of preparation of carbon fiber composite materials, can solve the problems of serious waste liquid environmental pollution, large product performance differences, complex operation process, etc., and achieve simple process, short preparation cycle, and increase ratio The effect of surface area

Pending Publication Date: 2022-04-05
HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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Problems solved by technology

[0004] Patent 201910284823.4 introduces in detail a process for producing carbon-carbon composite panels by using offcuts. The recycling of offcuts is mainly achieved through prefabricated body weaving, offcut filling and hot pressing, but this method requires prefabricated body Compilation is time-consuming and labor-intensive, and the hot-pressing process is carried out by directly mixing powder resin and leftover materials, which will not only generate a lot of dust, but also cause uneven mixing of some materials, resulting in large differences in the performance of each batch of products
[0005] Patent 201180007837.3 introduces a method of using recycled carbon fiber to prepare molded parts from carbon materials, but it has been subjected to liquid-phase impregnation treatment during the preparation process, the operation process is complicated and the waste liquid generated is serious to the environment. The preparation process of parts will also generate a lot of dust, which has a great impact on the environment

Method used

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  • Preparation method of chopped carbon fiber composite material
  • Preparation method of chopped carbon fiber composite material
  • Preparation method of chopped carbon fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A certain amount of turning material of carbon / carbon composite material is taken, and a carbon fiber composite material is obtained through the following preparation process.

[0054] Step 1) Pre-processing of solid waste materials:

[0055] Crushing and screening→acid-base washing→drying→oxidation treatment→surface mechanical modification

[0056] Turning solid waste materials are firstly crushed and screened with a screen size of 50 mesh, and then the impurities generated during the collection process are removed by acid-base washing and surface activation is carried out. After washing, drying and surface oxidation treatment are carried out, and finally through mechanical modification. Do final treatment to obtain resin modified coated carbon powder and chopped carbon fiber powder;

[0057] Step 2) Wet mixing: put the recycled chopped carbon fiber, commercial chopped carbon fiber, thermosetting resin and dissolving agent into a mixer according to a certain ratio and...

Embodiment 2

[0073] According to the preparation method of a kind of chopped carbon fiber composite material in embodiment 1

[0074] In the first step, the pretreatment process of solid waste treatment is the same as that in Example 1.

[0075] In the second step, the proportion of recycled carbon fiber in the mixture is 60%, commercial chopped carbon fiber is 10%, modified suspension resin is 30%, and the mass ratio of resin to solvent is 1:2.5. The commercial carbon fiber used The average length is 12mm, the diameter is 0.5mm, the thermosetting resin used is phenolic resin, and the solvent used is methanol.

[0076] In the third step, the drying temperature is 140° C., and the holding time is 3 hours.

[0077] In the step 4, the specific process of cold pressing is as follows: when the pressing pressure is 8 MPa, keep the pressure for 2 minutes; when the pressing pressure is 15 MPa, keep the pressure for 2 minutes; when the pressing pressure is 200 MPa, keep the pressure for 1 minute. ...

Embodiment 3

[0083] According to the preparation method of a kind of chopped carbon fiber composite material in embodiment 1

[0084] In said step one, the pretreatment process of solid waste treatment is the same as that of Example 1;

[0085] In the second step, the proportion of pre-treated recycled carbon fiber in the mixture is 60%, commercial chopped carbon fiber is 5%, modified suspension resin is 35%, and the mass ratio of resin to solvent is 1:3. The average length of the commercial carbon fibers used is 12 mm, and the diameter is 0.5 mm. The thermosetting resin used is phenolic resin, and the solvent used is methanol.

[0086] In the third step, the drying temperature is 140° C., and the holding time is 3 hours.

[0087] In the step 4, the specific process of cold pressing is as follows: when the pressing pressure is 10 MPa, keep the pressure for 1 minute; when the pressing pressure is 20 MPa, keep the pressure for 1 minute; when the pressing pressure is 150 MPa, keep the pressu...

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Abstract

The invention mainly relates to a method for preparing a carbon fiber composite material by taking a turning material of a carbon/carbon composite material as a main raw material and commercial chopped carbon fibers as a reinforcing phase, mainly aiming at the problems of resource recovery and reutilization in the production process of the carbon/carbon composite material. According to the method, turning materials and leftover materials generated in the workpiece turning process serve as main raw materials, the raw materials are subjected to pretreatment modification, wet mixing, drying, cold press forming, heat treatment and the like, the carbon/carbon composite material with high mechanical performance is prepared, and the material has wide application in the photovoltaic field, the heat treatment field, the friction field and the like. According to the invention, the effective utilization of resources is realized, the production cost is reduced, the solid wastes generated in the production process are effectively reduced, and the problem of environmental pollution is also well improved.

Description

technical field [0001] The invention relates to a method for preparing a carbon fiber composite material mainly using turning materials and leftover materials of workpieces and using commercial chopped carbon fiber as a reinforcing phase. Background technique [0002] With the continuous improvement of the technical level and the continuous consumption of resources, people's requirements for the development of circular economy are becoming more and more urgent. In my country, tens of thousands of tons of carbon / carbon composite materials are produced every year, and a large amount of processing waste containing carbon fibers is also produced during the preparation process. If these carbon fiber composite materials are directly discarded, due to their high mechanical strength, heat resistance, excellent friction and good corrosion resistance, it is difficult to treat and utilize waste. The pollution of carbon fiber composite waste to the environment has caused extensive atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
Inventor 廖寄乔褚胜林滕向桂詹荣华王华李军
Owner HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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