Asphalt is a low-molecular-weight hydrocarbon compound mainly composed of condensed polycyclic aromatic hydrocarbon compounds, some of which contain a small amount of sulfur and oxygen. Asphalt has a characteristic that the carbon content is more than 70%, so it is often used to make carbon fiber. Carbon fibers made from pitch can be mainly divided into two types, one with lower mechanical properties and the other with particularly good tensile strength.In this article, I will tell you about manufacturingpitch-based carbon fiberbasic process flow.
The pitch base used to make carbon fibers needs to meet several conditions. First of all, the pitch fiber must have good spinning rheological properties and chemical activity, because after spinning, if the fiber is not melted, it needs to undergo chemical reaction. If the chemical activity of the pitch is too poor, it cannot be well completed. this step. It must then have the chemical structure, relative molecular mass and distribution required for the mechanical properties of the pitch fiber. In order to make qualified asphalt, its chemical composition must be continuously adjusted. In addition, pitch is in a molten state, unlike general polymers. It cannot be stretched after curing, the strength is not high, and it is relatively fragile. Therefore, when spinning, the diameter of the filament is required to be less than 15 μm, so as to improve the strength.
In order to prevent the pitch fiber from melting during carbonization, it must be treated without melting before carbonization. There are two methods, gas-phase oxidation and liquid-phase oxidation. Vapor-phase oxidation is carried out in oxidizing gases such as ozone and sulfur trioxide, while liquid-phase oxidation is carried out in oxidizing gases such as sulfuric acid and hydrochloric acid. In this way, more satisfactory pitch-based carbon fibers can be produced. Pitch-based carbon fiber is mostly used to make carbon fiber parts with high performance requirements, and has irreplaceable value in the market.
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