Intermediate-phase asphalt stock with superior spinning performance and preparation method

Abstract

The invention relates to an intermediate-phase asphalt stock with superior spinning performance and a preparation method. The method comprises the following steps: performing a polymerization reaction on a naphthalene compound serving as a raw material in the presence of hydrogen fluoride and boron trifluoride serving as catalysts, wherein the using amount of the hydrogen fluoride is 0.5-15 times the mole number of the raw material, the using amount of the boron trifluoride is 0.2-1.0 time the mole number of the raw material, and the polymerization reaction temperature is 250-300 DEG C; after the polymerization reaction ends, removing HF-BF3 serving as a catalyst; distilling an obtained product under reduced pressure under the condition that the temperature is 400 DEG C and the pressure intensity is below 1KPa; and separating a low-boiling-point product out to obtain an intermediate-phase asphalt stock product. Compared with the prior art, intermediate-phase asphalt has the characteristics of superior spinning performance and small quantity of low molecular volatile matters in a spinning process. The preparation method contributes to long-term stable performance of spinning operation, is suitable for industrial production, and meanwhile contributes to the preparation of high-performance asphalt-based carbon fibers.

Description

technical field [0001] The invention relates to the field of carbon industry, in particular to a mesophase pitch raw material with excellent spinnability required for the manufacture of high-performance pitch-based carbon fibers and a preparation method. Background technique [0002] High-performance carbon fiber is light, has high strength and high elastic modulus, and plays a huge role as a high-value material in the fields of defense industry, aerospace, cutting-edge technology, pillar industry, and daily life. The demand for high-performance carbon fiber is increasing. The rate of greater than 10% has increased significantly year by year. [0003] According to the classification of raw materials used, carbon fiber can be divided into polyacrylonitrile-based (PAN) carbon fiber, pitch-based carbon fiber and viscose-based carbon fiber. At present, carbon fiber products are mainly the first two types, of which PAN-based carbon fiber accounts for about 70% and pitch-based ca...

AI Technical Summary

Problems solved by technology

Solid catalysts such as aluminum trichloride and alumina are difficult to separate from the reaction system, so there is a disadvantage that the catalyst is difficult to recycle and reuse. This not only increases the cost of carbon fiber manufacturing, but the more fatal disadvantage is that even if only a small amount remains in the pitch fiber The catalyst will also lead to a serious decrease in fiber strength in the subsequent pre-oxidation, carbonization, and graphitization projects

However, in these low softening point pitches, there are more volatile components with low boiling points, resulting in severe pressure fluctuations, unstable filaments and even broken filaments during the spinning process, which seriously affects the long-term stability of the spinning operation.

In addition, these volatile components will also pollute the filaments, and the residual pollutants will become one of the causes of surface defects in the final carbon fiber manufacturing, seriously affecting the strength of carbon fibers