Mesophase-pitch-based carbon fiber and preparation method thereof

A technology of mesophase pitch and pitch fiber, which is applied in the field of mesophase pitch-based carbon fiber and its preparation, can solve the problem of inability to prepare carbon fiber with high thermal conductivity, high electrical conductivity and high modulus performance, difficult graphitization of phenolic resin raw materials, affecting product performance, etc. problem, to achieve the effect of low production cost, improved drafting effect and reduced fire risk

Active Publication Date: 2016-01-20
ANHUI HONGCHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has no problem in principle, but there are great difficulties in specific technical details, especially changes in these details will greatly affect product performance
[0007] Scheme 3, adopts the technology of mixing phenolic resin and polyethylene and then melt-spinning to prepare ultra-fine carbon fibers. This technology also has great difficulties in drafting technology, and the obtained phenolic resin raw materials are difficult to graphitize, and cannot be prepared. Conductive, high modulus performance carbon fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method of the mesophase pitch-based carbon fiber of the present invention comprises:

[0030] Step S1, mesophase pitch polymerization: mixing coal tar pitch, petroleum pitch or aromatics synthetic pitch with C9 fraction, polystyrene, tetrahydronaphthalene, or ethylene tar pitch with a softening point 70% and softening point>220°C.

[0031]Step S2, modification and viscosity reduction: Put the mesophase pitch into a screw extruder, fully extrude and heat to a molten state, add a pitch reducer, and mix well to obtain a mixture, put the mixture into Put it into a shear mixer, and carry out ultrasonic shearing treatment under an inert atmosphere to obtain a softening point of 160-240°C and a viscosity (320°C, 600s -1 )<10000cp of the reduced viscosity spinning raw material.

[0032] In this step, the asphalt viscosity reducer is one or more mixtures of naphthalene, anthracene, triethanolamine, ethylene bis-stearamide, polyacrylamide, and polystyrene.

[00...

Embodiment 1

[0055] A preparation method for the preparation of mesophase pitch-based carbon fibers, comprising the steps of:

[0056] (1) Mesophase pitch polymerization: use coal tar pitch with QI0.03%, TI2%, ash content 25ppm, softening point 70°C, atomic molar ratio H / C of 0.68 and polystyrene in a mass ratio of 10:1 and heat to Thermal polymerization at 380°C for 6h, and at 380°C with 0.5m 3 / (h·kg) nitrogen purging treatment for 5 hours, the obtained mesophase pitch has a mesophase content of 80%, a softening point of 240°C, a thermal stability (380°C constant temperature for 30min under an inert atmosphere), a weight loss of 0.75%, and a viscosity (320°C, 600s -1 ) 14500cp.

[0057] (2) Modification and viscosity reduction: Put the mesophase pitch raw material obtained in step (1) into the screw extruder, fully extrude and heat to 260°C to form a molten state, and add naphthalene and mesophase pitch at the end of the screw extruder The mass ratio of naphthalene to naphthalene is 1...

Embodiment 2

[0065] A preparation method of mesophase pitch-based carbon fiber, comprising the steps of:

[0066] (1) Mesophase pitch polymerization: use petroleum pitch with QI0.02%, TI0.1%, ash content 25ppm, softening point 65°C, atomic molar ratio H / C of 0.71 and ethylene tar pitch with softening point 30°C by mass Mixing at a ratio of 10:4 and heating to 370°C for thermal polymerization for 10 hours, and flashing at 380°C with a vacuum atmosphere of 0.1 MPa to remove low-molecular products and unstable compounds to obtain an intermediate with a mesophase content of 85% and a softening point of 250°C Phase pitch, thermal stability (380°C constant temperature for 30min under inert atmosphere), weight loss 1.2%, viscosity (320°C, 600s -1 ) 12000cp.

[0067] (2) Modification and viscosity reduction: put the mesophase pitch raw material obtained in step 1 into the screw extruder, fully extrude and heat to 300°C to form a molten state, and add ethylene bishard amide at the end of the screw...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/145D01F9/15D01F9/155D01F9/32
Inventor 陈新华柳睿
Owner ANHUI HONGCHANG NEW MATERIAL CO LTD
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