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Preparation method of continuous high-performance intermediate-phase asphalt-based carbon fiber

A technology of mesophase pitch and carbon fiber, applied in the field of pitch fiber, can solve the problems of complex process, low output, poor controllability, etc., and achieve the effects of good controllability, high yield and simple preparation method

Active Publication Date: 2016-08-24
湖南东映碳材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing continuous high-performance mesophase pitch-based carbon fiber preparation method has complicated process, poor controllability, low output, and continuous heat treatment equipment cannot meet actual needs, so the performance of the prepared mesophase pitch-based carbon fiber cannot be compared with foreign products.

Method used

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  • Preparation method of continuous high-performance intermediate-phase asphalt-based carbon fiber
  • Preparation method of continuous high-performance intermediate-phase asphalt-based carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, the spun continuous mesophase pitch-based carbon fiber precursors are regularly wound into a graphite crucible with micropores through a wire return mechanism; the graphite crucible with carbon fiber precursors is placed in a pre-oxidation furnace, and the While entering the air, the temperature in the pre-oxidation furnace is slowly raised to 280 °C at a rate of 1 °C / min, and the pre-oxidation is maintained at a constant temperature for 15 hours. The tar volatiles generated during the pre-oxidation process are discharged through the top of the furnace to be condensed and recycled; after the pre-oxidation is completed, the Vacuumize the pre-oxidation furnace, feed inert gas to keep the pre-oxidation furnace at normal pressure, continue to heat up the pre-oxidation furnace slowly at a rate of 1°C / min to 500°C, and keep constant temperature and low temperature for carbonization for 1h; continue to feed inert gas while pre-oxidation The furnace continues to heat up s...

Embodiment 2

[0022] First, the spun continuous mesophase pitch-based carbon fiber precursors are regularly wound into a graphite crucible with micropores through a wire return mechanism; the graphite crucible with carbon fiber precursors is placed in a pre-oxidation furnace, and the While entering the air, the temperature in the pre-oxidation furnace is slowly raised to 320 °C at a rate of 2 °C / min, and the pre-oxidation is maintained at a constant temperature for 6 hours. The tar volatiles generated during the pre-oxidation process are discharged through the top of the furnace to be condensed and recycled; after the pre-oxidation is completed, the Vacuumize the pre-oxidation furnace, feed inert gas to keep the pre-oxidation furnace at normal pressure, continue to heat up the pre-oxidation furnace slowly at a rate of 2°C / min to 500°C, and maintain a constant temperature and low temperature for carbonization for 1 hour; continue to feed inert gas while pre-oxidizing The furnace continues to ...

Embodiment 3

[0024] First, the spun continuous mesophase pitch-based carbon fiber precursors are regularly wound into a graphite crucible with micropores through a wire return mechanism; the graphite crucible with carbon fiber precursors is placed in a pre-oxidation furnace, and the While entering the air, the temperature in the pre-oxidation furnace is slowly raised to 300 °C at a rate of 2 °C / min, and the constant temperature pre-oxidation is maintained for 15 hours. The tar volatiles generated during the pre-oxidation process are discharged through the furnace top to be condensed and recycled; after the pre-oxidation is completed, the Vacuumize the pre-oxidation furnace, feed inert gas to keep the pre-oxidation furnace at normal pressure, continue to heat up the pre-oxidation furnace slowly at a rate of 5°C / min to 600°C, and keep constant temperature and low temperature for carbonization for 1 hour; continue to feed inert gas while pre-oxidation The furnace continues to heat up slowly at...

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Abstract

The invention discloses a preparation method of continuous high-performance intermediate-phase asphalt-based carbon fiber. The preparation method includes: winding spun carbon fiber precursor into a microporous graphite crucible through a garnett, disposing the graphite crucible in a pre-oxidation furnace, and feeding air to pre-oxidize the carbon fiber precursor in the pre-oxidation furnace; after pre-oxidation is finished, feeding inert gas, and performing low-temperature carbonization and high-temperature carbonization on pre-oxidized carbon fiber; cooling the pre-oxidation furnace to normal temperature, taking out the graphite crucible, and disposing the same in an intermittent high-temperature graphitizing furnace for graphitizing to obtain continuous high-strength high-modulus high-heat-conductivity asphalt-based carbon fiber. The preparation method is simple and high in controllability and yield, and the defect that a domestic continuous graphitizing furnace cannot be heated to higher than 2800 DEG C is overcome; tensile strength of the high-performance intermediate-phase asphalt-based carbon fiber is 2.2-3.5GPa, modulus of elasticity is 650-750GPa, and heat conductivity is 900-1050 W / m*K.

Description

technical field [0001] The invention relates to the technical field of pitch fibers, in particular to a preparation method of continuous high-performance mesophase pitch-based carbon fibers. Background technique [0002] In the 1960s, Japan invented the preparation process of pitch-based carbon fiber. Subsequently, the research on pitch-based carbon fiber has developed rapidly abroad. Although my country has achieved certain research results in this field, it has not yet formed a production capacity. The raw materials of pitch-based carbon fibers are relatively extensive, and by-products of coal and petroleum processing as well as synthetic pitch can be used as raw materials for pitch-based carbon fibers. my country is rich in coal resources, and the development prospect of spinning pitch prepared from coal tar pitch and synthetic pitch, a by-product of coal processing, is very optimistic. The existing continuous high-performance mesophase pitch-based carbon fiber preparat...

Claims

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Application Information

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IPC IPC(8): D01F9/145
CPCD01F9/145
Inventor 李轩科李保六叶崇张福全刘金水
Owner 湖南东映碳材料科技股份有限公司
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