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Surface modification method of polyacrylonitrile-based carbon fiber

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile-based carbon, which is applied in the field of preparation of polyacrylonitrile-based carbon fiber, and can solve the problem that the interlayer shear strength and fiber tensile strength of carbon fiber composite materials cannot meet the requirements at the same time, and the process is complicated. problem, to achieve the effect of increased interlayer shear strength, simple process and good uniformity

Inactive Publication Date: 2013-10-23
SURREY HI TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for surface modification of polyacrylonitrile-based carbon fibers to solve the problem that the interlaminar shear strength and fiber tensile strength of carbon fiber composite materials after the existing method cannot meet the requirements at the same time, and the process is complicated technical problem

Method used

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  • Surface modification method of polyacrylonitrile-based carbon fiber
  • Surface modification method of polyacrylonitrile-based carbon fiber
  • Surface modification method of polyacrylonitrile-based carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Control the wire-feeding speed of 50 strands of 1K carbon fiber to 3m / min, and use a dielectric barrier discharge plasma generator to conduct plasma treatment on the carbon fiber at the outlet of the high-temperature carbonization furnace under atmospheric pressure and argon gas. The discharge power of the dielectric barrier discharge plasma generating device is 1500W, and then the carbon fiber after the plasma treatment is atomized with a maleic anhydride solution. The mass percentage concentration of the maleic anhydride solution is 2%, and the pump supply rate is 0.05L / min. The pressure of purified compressed air is 0.4Mpa. After the surface modification of the polyacrylonitrile-based carbon fiber is completed, it is directly sent to the sizing, drying and winding process to obtain the finished carbon fiber, which is compounded with the resin matrix epoxy E-51 to form a carbon fiber composite material, and the interlayer shear is measured. strength value.

Embodiment 2

[0031] Control the wire-feeding speed of 50 strands of 1K carbon fiber to 3.5m / min, and use a dielectric barrier discharge plasma generator to conduct plasma treatment on the carbon fiber at the outlet of the high-temperature carbonization furnace under atmospheric pressure and argon gas. The discharge power of the dielectric barrier discharge plasma generating device is 3000W, and then the carbon fiber after plasma treatment is atomized with maleic anhydride solution. The mass percentage concentration of maleic anhydride solution is 2.5%, and the pump supply rate is 0.1L / min. The pressure of purified compressed air is 0.5Mpa. After the surface modification of the polyacrylonitrile-based carbon fiber is completed, it is directly sent to the sizing, drying and winding process to obtain the finished carbon fiber, which is compounded with the resin matrix epoxy E-51 to form a carbon fiber composite material, and the interlayer shear is measured. strength value.

Embodiment 3

[0033] Control the wire-feeding speed of 50 strands of 1K carbon fiber to 3.5m / min, and use a dielectric barrier discharge plasma generator to conduct plasma treatment on the carbon fiber at the outlet of the high-temperature carbonization furnace under atmospheric pressure and argon gas. The discharge power of the dielectric barrier discharge plasma generating device is 3000W, and then the carbon fiber after the plasma treatment is subjected to atomization treatment of a mixed solution of methyl acrylate and acrylamide. The mass percentage concentration of the mixed solution is 2.5%, methyl acrylate: propylene Amide=1:1 (molar ratio), the pump supply rate is 0.1L / min, and the pressure of purified compressed air is 0.5Mpa. After the surface modification of polyacrylonitrile-based carbon fiber is completed, it is directly sent to the sizing, drying and winding process to obtain the finished carbon fiber, which is compounded with resin matrix epoxy E-51 to form a carbon fiber com...

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Abstract

The invention relates to a surface modification method of polyacrylonitrile-based carbon fiber. The surface modification method comprises the following steps of: performing plasma treatment on the polyacrylonitrile-based carbon fiber in an inert gas atmosphere; and further performing atomization treatment on the carbon fiber after plasma treatment through a grafting solution. The method disclosed by the invention has the advantages that as for the carbon fiber after the treatment according to the invention, the surface energy is increased, the wettability is improved, the treatment uniformity is good, the mechanical properties are less damaged, and the interlaminar shear strength value of a carbon fiber composite material is improved. The method disclosed by the invention has the advantages of simplicity and convenience in operation and control, simple process steps and online continuous treatment.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile-based carbon fibers, in particular to a method for surface modification of polyacrylonitrile-based carbon fibers. Background technique [0002] Carbon fiber is an inorganic polymer fiber with a carbon content of more than 90%. It is made by carbonizing various organic fibers in an inert gas at high temperature. It has the inherent characteristics of carbon graphite materials and has the softness and flexibility of textile fibers. Processability, is a new generation of reinforcing fibers. Carbon fiber not only has a series of excellent properties such as high specific strength and specific modulus, high electrical conductivity, low thermal expansion coefficient, high temperature resistance, corrosion resistance, and creep resistance, it is widely used in cutting-edge fields such as aerospace, national defense and military, as well as transportation, civil engineering, etc. Construction, ...

Claims

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Application Information

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IPC IPC(8): D01F11/16D01F11/14C08J5/06C08L63/00C08K9/04C08K7/06
Inventor 徐绍魁
Owner SURREY HI TECH INC
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