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Preparation method of viscose high-temperature graphite carbon fibers

A technology of high-temperature graphite and viscose fiber, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc. It can solve the problem that the carbon content cannot reach 99% or even higher, it is difficult to adapt to the needs of modern technological production, and the performance of carbon fiber cannot reach the extreme, etc. problem, to achieve the effect of increasing carbonization application objects, increasing force, and high degree of carbonization

Active Publication Date: 2019-07-02
梁继选
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Limited by the existing production technology, the carbon content of carbon fiber materials currently on the market cannot reach 99% or higher, which leads to the inability to achieve the ultimate performance of carbon fiber, and it is difficult to meet the production needs of modern technology

Method used

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  • Preparation method of viscose high-temperature graphite carbon fibers
  • Preparation method of viscose high-temperature graphite carbon fibers
  • Preparation method of viscose high-temperature graphite carbon fibers

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preparation example Construction

[0029] The preparation method of viscose high-temperature graphite carbon fiber comprises the following steps:

[0030] (1) Soaking medicine: at room temperature, soak the viscose fiber in diammonium hydrogen phosphate or ammonium bromide dilute solution for not less than 24 hours; diammonium hydrogen phosphate is an activated flame retardant with a concentration of 6%. Efficient activation performance, energy particles form nano-scale micropores on the surface of viscose fibers to improve its adsorption capacity; ammonium bromide is a reinforced flame retardant with a concentration of 10%, which can increase the strength of carbonized fibers and improve their tensile strength Extensibility; what adopted in the embodiment is that concentration is 10% dilute ammonium bromide solution, viscose fiber is the 5cm wide fiber cloth that is woven by the carbon fiber bundle of 1.5dtex, diameter 20 μm, 1200 bundles, and viscose fiber is purchased from Japan OMIKENSHI company.

[0031] ...

Embodiment 1

[0037] At room temperature, soak the viscose fiber in a dilute ammonium bromide solution with a concentration of 10% for 24 hours; then, dry the viscose fiber naturally and control its humidity to 10%; then dry the viscose fiber after drying Low-temperature pre-curing, the temperature is controlled at 50°C, the pre-curing feed rate of viscose fiber is controlled at 1m / min, and the mixed gas protection of nitrogen and water vapor with a volume ratio of 1:1 is filled at the same time; then, the viscose fiber Carry out medium-temperature carbonization, the temperature is controlled within 400°C, and at the same time, the mixed gas of nitrogen and water vapor with a volume ratio of 1:1 is filled for protection; finally, the viscose fiber is subjected to high-temperature carbonization, the temperature is controlled at 2400°C, and argon gas is filled Protection, the time is 72h.

Embodiment 2

[0039] At room temperature, soak the viscose fiber in a dilute ammonium bromide solution with a concentration of 10% for 30 hours; then, dry the viscose fiber naturally and control its humidity to 10%; then dry the viscose fiber after drying Low temperature pre-curing, the temperature is controlled at 60°C, the pre-curing feed rate of viscose fiber is controlled at 1m / min, and at the same time, the mixed gas protection of nitrogen and water vapor with a volume ratio of 1:1 is filled; then, the viscose fiber Carry out medium-temperature carbonization, the temperature is controlled within 350°C, and at the same time, the mixed gas of nitrogen and water vapor with a volume ratio of 1:1 is filled for protection; finally, the high-temperature carbonization of viscose fibers is carried out, the temperature is controlled at 2400°C, and argon gas is filled Protection, the time is 72h.

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Abstract

The invention relates to a preparation method of viscose high-temperature graphite carbon fibers. The method comprises the following steps: (1) dipping into chemicals: dipping the viscose fibers intoa dilute solution of diammonium hydrogen phosphate or ammonium bromide for not less than 24h at room temperature, wherein the viscose fibers are cloth made of tows; (2) drying: introducing the viscosefibers, dipped into the chemicals, into a drying oven at 180 DEG C or enabling the viscose fibers to be naturally dried, and controlling the humidity not to exceed 10%; (3) carrying out step-by-stepcarbonization: enabling the dried viscose fibers to be sequentially subjected to the low-temperature precuring, medium-temperature carbonization and high-temperature carbonization to obtain the viscose high-temperature graphite carbon fibers. The preparation method provided by the invention can not only carbonize the viscose fiber tows, but also carbonize the cloth made of viscose fiber tows, thusincreasing the application targets of carbonization, and further promoting a carbonization process of the viscose fibers; furthermore, the carbon content of the obtained viscose high-temperature graphite carbon fibers is as high as 99.99%, and the degree of carbonization is high, so that the acting force between carbon atoms in the carbon fibers is further improved, and the performance of the carbon fibers is better maximized.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, in particular to a preparation method of viscose high-temperature graphite carbon fibers. Background technique [0002] Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fibers with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber, and undergoing carbonization and graphitization. Carbon fiber is "soft on the outside and rigid on the inside", lighter than metal aluminum, but stronger than steel, and has the characteristics of corrosion resistance and high modulus. It is an important material in national defense and civilian applications. It not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/16
CPCD01F9/16
Inventor 梁继选
Owner 梁继选
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