Process for producing pitch-based carbon fibers

Details Process for producing pitch-based carbon fibers Process for producing pitch-based carbon fibers

1990-04-27

1991-10-29

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Filaments

264 82, 264 83, 26421111, 208 22, 208 39, 208 41, 4234477, 4234478, 423448, D01F 9155

Patent

active

050614134

ABSTRACT:
A pitch-based carbon fiber having a high strength is produced by (a) treating a heavy oil at a temperature of 370.degree. to 480.degree. C. and a pressure of 2 to 50 kg/cm.sup.2 ; (b) separating and removing insoluble solids from the heat-treated oil so that the insoluble solids content is not higher than 50 ppm; (c) subjecting the oil to thin film distillation at a temperature of 250.degree. to 450.degree. C., a pressure of not higher than 100 mm Hg and a film thickness of not larger than 5 mm; (d) heat-treating the resulting pitch at a temperature of 340.degree. to 450.degree. C. while passing an inert gas at atmospheric or reduced pressure to obtain an optically anisotropic pitch having a softening point of 260.degree. to 300.degree. C., a quinoline insolubles content of not higher than 40 wt % and an optically anisotropic phase content of 60 to 100 vol %; (e) melt-spinning said optically anesotropic pitch in a melt-spinning apparatus having a nozzle with a vertically longer molded product disposed therein, at a temperature of 280.degree. to 360.degree. C. and a spinning viscosity of 300 to 3,000 poise; (f) rendering the resulting pitch fiber infusible and (g) calcining the infusibilized fiber in an inert gas atmosphere, initially at a temperature of 650.degree. to 850.degree. C. and subsequently conducting calcination at a temperature of 1,200.degree. to 3,000.degree. C.

REFERENCES:
patent: 4005183 (1977-01-01), Singer
patent: 4209500 (1980-06-01), Chwastiak et al.
patent: 4469667 (1984-09-01), Uemura et al.
patent: 4575411 (1986-03-01), Uemura et al.
patent: 4620919 (1986-11-01), Uemura et al.
patent: 4717331 (1988-01-01), Maeda et al.
Carbon vol. 16 pp. 408-415 by Leonard S. Singer.
High Modulus Pitch-Based Carbon Fibers by H. F. Volk, presented at the Symposium on Carbon-Fiber-Reinforced Plastics, May 11-12, 1977.

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