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Graphitized compound carbon fibers and preparation method thereof

A composite carbon fiber and graphitization technology, applied in fiber processing, fiber chemical characteristics, stretch spinning, etc., can solve the problems of immature electrospinning technology, high requirements for spinning solution preparation, and easy curing of thermosetting resins. Beneficial for continuous production, avoids spinning blockage problems, and reduces the chance of resin curing

Active Publication Date: 2016-01-13
ANHUI HONGCHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-molecular-weight linear polymers, thermoplastic phenolic resins, and thermosetting phenolic resins can also be used to prepare electrospinning solutions to make fibers, and then solidify and shape them. However, the difficulty of this preparation method lies in the high requirements for the preparation of spinning solutions. Electrospinning technology is not mature, resulting in poor reproducibility
[0007] In order to overcome the above difficulties, high-speed centrifugation can be used to prepare carbon nanofibers. Centrifugal spinning technology is a low-cost spinning method, but this spinning method can only process low-viscosity solutions or melts into submicron fibers. For high-viscosity liquids, due to the limited centrifugal force, it is difficult to reach below 2 microns, and the centrifugal spinning technology is generally used in the preparation process of thermoplastic phenolic resins. Applying the centrifugal spinning technology to the preparation process of thermosetting resins will easily lead to the easy production of thermosetting resins. Fatal problems such as curing and difficult cleaning of equipment

Method used

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Effect test

preparation example Construction

[0031] The preparation method of graphitized composite carbon fiber of the present invention, comprises the steps:

[0032] Step S1, step-by-step feeding and mixing: according to the mass ratio, take 5-300 parts of spinning pitch, 2-30 parts of aromatic viscosity reducer, 0.5-10 parts of high-temperature release agent, 100 parts of soluble thermosetting phenolic resin, 3-120 parts Soluble thermosetting phenolic resin solvent, mixed to obtain spinning raw materials.

[0033] Here, the property requirement of the soluble thermosetting phenolic resin is that when the heating temperature of the soluble thermosetting phenolic resin is 180° C., the curing time is >20s.

[0034] Optionally, the spinning pitch has a quinoline insoluble content QI<40%, an ash content<300ppm, and a softening point of 180-300°C. Optionally, the soluble thermosetting phenolic resin is an oil-soluble phenolic resin. Optionally, the aromatic hydrocarbon viscosity reducer is one or a mixture of naphthalene...

Embodiment 1

[0057] A method for preparing graphitized composite carbon fibers, comprising the steps of:

[0058] Step-by-step feeding and mixing: the quinoline insoluble content QI of the spinning pitch is 38%, the ash content is 280ppm, and the softening point is 285°C. The soluble thermosetting phenolic resin is a commercially available oil-soluble thermosetting phenolic resin, and the curing time at 180°C is 45s.

[0059] Three screw extruders are used, and the materials to be added are calculated according to the mass ratio. Take 100 parts of spinning pitch, 20 parts of naphthalene, and 5 parts of perfluoropolyether oil and add them to the first screw extruder, heat to 340 ° C to melt, and take 10 parts Add 1 part of soluble thermosetting phenolic resin and 6 parts of 100# solvent oil to the second screw extruder, heat to 140°C, and melt and extrude the melts of the first and second screw extruders from the die with a diameter of 1 mm The molten raw material in strip shape was obtain...

Embodiment 2

[0067] A preparation of graphitized composite carbon fiber, comprising the steps of:

[0068] Step-by-step feeding and mixing: the quinoline insoluble content QI of the spinning pitch is 5%, the ash content is 250ppm, and the softening point is 240°C. The soluble thermosetting phenolic resin is a commercially available oil-soluble thermosetting phenolic resin, and the curing time at 180°C is 25s.

[0069] Three screw extruders are used, and the materials to be added are calculated according to the mass ratio. Take 10 parts of spinning pitch, 2 parts of naphthalene, and 1 part of methyl silicone oil into the first screw extruder, heat to 260 ° C and melt, and take 100 parts of soluble Thermosetting phenolic resin and 80 parts of 100# solvent oil are added to the second screw extruder, heated to 50°C, and the melts of the first and second screw extruders are melted and extruded from the die with a diameter of 3 mm to obtain strips The melted raw materials were fed into the thir...

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Abstract

The invention discloses a preparation method of graphitized compound carbon fibers. The method comprises the following steps: charging materials by steps and mixing, centrifuging and spinning, spraying hot airflow, curing, carbonizing and graphitizing. The prepared graphitized compound carbon fibers have the characteristics that the average diameter is 0.5-4 microns, the average length is 0.1mm-120mm, the tensile strength is 0.7GPa-1.8GPa, the tensile modulus is 30GPa-80GPa, the heat conductivity is 1W / m.k-5W / m.k (radial) and the initial oxidization temperature is 500-650 DEG C. The graphitized compound carbon fibers have low manufacturing cost and can be widely applied to technical fields of heat preservation and heat insulation, activated adsorption, friction and the like.

Description

technical field [0001] The invention relates to the technical field of composite carbon fibers, in particular to a preparation method of a novel ultrafine non-graphitizable composite carbon fiber. Background technique [0002] With the development of society, the improvement of people's quality of life and the renewal of industrial technology, people's awareness of environmental protection is constantly increasing, and energy conservation and emission reduction are increasingly concerned. [0003] High-temperature insulation materials, whether they are used as anti-ablation materials in the aerospace field or industrial energy-saving and emission-reducing materials, have put forward more stringent requirements on the performance of materials. Phenolic-based carbon fiber is a carbon fiber prepared from phenolic resin, which is difficult to graphitize. It has thermal insulation and ablation resistance unmatched by other carbon fiber systems. It is the best carbon fiber for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/145D01F9/24D01F1/10D01D5/14D01D5/18
Inventor 陈新华柳睿
Owner ANHUI HONGCHANG NEW MATERIAL CO LTD
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