A kind of preparation method and device of spinnable mesophase pitch

Abstract

The invention relates to a preparation method and device for spinnable mesophase pitch. The preparation method is based on the self-migration of asphalt as a mixture of different molecular weights under the action of heat to realize the polymerization of different components in different temperature regions, thereby narrowing the molecular weight distribution. The device includes a vertical tube reactor, and the reaction chamber inside the vertical tube reactor is in the shape of a hollow cylinder, and the length-to-diameter ratio of the hollow part is 10-40:1. The preparation method is as follows: the cavity is subjected to segmental temperature control and inert atmosphere protection, the asphalt is continuously fed from the top of the cavity and continuously discharged from the bottom of the cavity to carry out gradient non-isothermal polymerization to obtain Spinning mesophase pitch; the mesophase morphology of the spinnable mesophase pitch is wide-area streamlined, the mesophase content is greater than 90%, and the ratio of the mole number of the highest molecular weight in the molecule to the sum of the mole numbers of all molecular weights is greater than 80mol %. The invention realizes dynamic separation of mesophase pitch components and gradient non-isothermal polymerization, and improves its spinnability.

Description

A kind of preparation method and device of spinnable mesophase pitch technical field The invention belongs to novel carbon material technical field, relate to a kind of preparation device and method of spinnable mesophase pitch. Background technique Mesophase pitch is a nematic thermotropic liquid crystalline substance formed by the accumulation of large planar condensed ring aromatic hydrocarbon molecules. Refractive properties are generally obtained by thermal polycondensation of petroleum pitch, coal pitch, petroleum residue, etc., or by pure aromatic hydrocarbons under the action of catalysts. Prepared by catalytic polycondensation. Mesophase pitch improves the performance of the product due to its suitability for forming a highly anisotropic graphite-like structure. Therefore, it has become an excellent precursor for the preparation of ultra-high modulus and ultra-high thermal conductivity carbon fibers. The mesophase pitch-based carbon fiber prepared by taking...

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Problems solved by technology

However, this method also has the disadvantages of low yield and incapable of continuous production.

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