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2007-01-25 08:00:00

What are the raw materials for producing carbon fiber? Perhaps the process is what?

Raw materials for carbon fiber production

Raw materials for carbon fiber production

Reinforcing materials: Reinforcing materials for winding molding, mainly various kinds of fiber yarns: eg alkali-free glass fiber yarn, medium alkali glass fiber yarn, carbon fiber yarn, high-strength glass fiber yarn, aramid fiber yarn and surface felt.

Resin matrix: Resin matrix refers to the glue system composed of resin and curing agent.

Filler: There are many types of fillers, which can improve some of the functions of the resin matrix after it is added.

Production Process:

(1) Preparation of raw silk, polyacrylonitrile and visco- collagen fibers are mainly produced by wet spinning, and pitch and phenolic raw fibers are produced by melt spinning. The preparation of high-performance PAN-based carbon fibers requires the use of high-purity, high-strength, and uniform-quality PAN precursors, and the comonomer used to prepare the precursors is itaconic acid. The preparation of anisotropic high-performance pitch-based carbon fibers requires the pretreatment of asphalt into mesophase, pre-mesophase (benzene-soluble anisotropic asphalt), and potential mesophase (quinoline-soluble anisotropic asphalt). As a viscose-based carbon fiber for ablative materials, the precursor thereof is required to contain no alkali metal ions.

(2) Pre-oxidation (polyacrylonitrile fiber 200 to 300 C), non-melting (asphalt 200 to 400 C) or heat treatment (viscose 240 C) to obtain heat-resistant and infusible fibers, no phenolic-based carbon fibers Process.

(3) Carbonization, the temperature of which is: 1000 to 1500C for polyacrylonitrile fiber, 1500 to 1700C for bitumen, and 400 to 2000C for viscose.

(4) Graphitization, polyacrylonitrile fiber 2500 to 3000 C, pitch 2500 to 2800 C, viscose fiber 3000 to 3200 C.

(5) Surface treatment, gas phase or liquid phase oxidation, etc., giving the fiber chemical activity to increase the affinity for the resin.

(6) Sizing treatment to prevent fiber damage and increase the affinity with the resin matrix. The resulting fibers have a variety of different cross-sectional structures.


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