Mesophase-pitch-based carbon fiber and preparation method thereof

Abstract

The invention discloses a mesophase-pitch-based carbon fiber and a preparation method thereof. The preparation method comprises the steps of conducting mesophase pitch polymerization, modification and visbreaking, conducting centrifugal spinning, conducting hot jetting drafting, conducting oxidation, carbonization and graphitization, and obtaining the mesophase-pitch-based carbon fiber. The diameter of the mesophase-pitch-based carbon fiber ranges from 120 nm to 2000 nm, the draw ratio is 500-20000: 1, the tensile strength is 1.5-4.0 GPa, the tensile modulus is 300-600 GPa, the electrical resistivity is less than 0.2 * 10 <-4> omega.cm, the thermal conductivity is 500-800 W / m.k, and the mesophase-pitch-based carbon fiber is low in fabrication cost and can be applied to fields such as static electricity resistance, heat dissipation, electromagnetic shielding and heat shielding.

Description

technical field

[0001] The invention relates to the technical field of preparation of carbon fiber heat insulation materials, in particular to a submicron discontinuous mesophase pitch-based carbon fiber and a preparation method thereof. Background technique

[0002] With the development of society, the improvement of people's living standards and the renewal of industrial technology, people's requirements for materials are getting higher and higher. Pitch carbon fibers, especially mesophase pitch carbon fibers, have the characteristics of excellent thermal conductivity, excellent mechanical properties, and high electrical conductivity. The cost makes the application of carbon fiber severely restricted.

[0003] At present, only three companies in the world, Mitsubishi Chemical of Japan, Japan Graphite, and Cytec of the United States, can produce mesophase pitch carbon fiber, with a total production capacity of less than 1,500 tons per year, far lower than that of polyacryl...