Asphalt-based composite carbon fiber and preparation method thereof

Abstract

The invention provided an asphalt-based composite carbon fiber and a preparation method thereof. The preparation method of the asphalt-based composite carbon fiber includes the following steps: heating metal tin and an nano-microporous glass powder, and uniformly dispersing the nano-microporous glass powder through the molten metal tin to obtain a metal tin composite liquid; spraying the metal composite liquid on the surface of asphalt spinning fibers when spinning isotropic spinnable asphalt, so that the metal tin and the nano-microporous glass are evenly wrapped on the surface of the asphaltfibers after condensation; and then, performing oxidization and carbonization on the asphalt fibers to obtain the asphalt-based composite carbon fibers coated with tin dioxide and nano-microporous glass on the surface. According to the invention, when the asphalt is spun into fibers, the surfaces of the fibers are coated with metal tin and the nano-microporous glass powder, which not only effectively prevents the hot-melt adhesion of the asphalt fibers, but also the micro-porous glass powder is breathable, so that the coated asphalt fibers are easy to oxidize and carbonize; and therefore, thedefects of the asphalt-based carbon fibers in all the time that the asphalt-based carbon fibers are easy for adhesion when forming fibers, the fibers are easy to deform, and the performance is low are solved.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a pitch-based composite carbon fiber and a preparation method. Background technique [0002] Carbon fiber has many excellent properties. Carbon fiber has high axial strength and modulus, specific heat and electrical conductivity between non-metal and metal, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, and Good fatigue, small thermal expansion coefficient and anisotropy, good corrosion resistance, good X-ray transparency, good electrical and thermal conductivity and electromagnetic shielding. [0003] Pitch-based carbon fiber is the second largest type of carbon fiber after PAN-based carbon fiber. Pitch-based carbon fiber Pitch-based carbon fiber is a special fiber with high carbon content obtained from pitch as raw material through refining, spinning, pre-oxidation, carbonization or graphitizat...

AI Technical Summary

Problems solved by technology

[0008] In view of the fact that the pitch fiber is a thermoplastic material in the preparation of carbon fiber by pitch spinning, it will soften and melt during carbonization, which will affect the shape of the fiber and the effect of the fiber. The present invention proposes a pitch-based composite carbon fiber and its preparation method. When forming fibers, the surface is coated with metal tin and nano-microporous glass powder, which can effectively prevent the hot-melt adhesion of pitch fibers and facilitate oxidation and carbonization.