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High surface activity pitch-based graphite fiber and preparation method thereof, and resin-based composite material prepared based on high surface activity pitch-based graphite fiber

A high surface activity, graphite fiber technology, applied in the direction of carbon fiber, fiber type, fiber treatment, etc., can solve the problem of low shear strength, etc., to improve the bonding ability, increase the interlayer shear strength, and increase the interlayer shear strength Effect

Inactive Publication Date: 2020-03-24
SHAANXI TIANCE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the pitch-based graphite fiber without surface treatment has a small interlaminar shear strength after being prepared into a resin-based composite material, and the interlaminar shear strength of the resin-based composite material is only 20MPa-30MPa

Method used

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  • High surface activity pitch-based graphite fiber and preparation method thereof, and resin-based composite material prepared based on high surface activity pitch-based graphite fiber
  • High surface activity pitch-based graphite fiber and preparation method thereof, and resin-based composite material prepared based on high surface activity pitch-based graphite fiber
  • High surface activity pitch-based graphite fiber and preparation method thereof, and resin-based composite material prepared based on high surface activity pitch-based graphite fiber

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Experimental program
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Effect test

Embodiment 1

[0041] Using mesophase pitch as raw material, 2K pitch-based precursors were prepared by melt spinning, and the fiber diameter (average value) was 20 μm. After the wire unwinding machine automatically unwinds the wire, it is processed by three-roller rollers without melting. The processing temperature is 240°C-300°C (drawing 1%), and the compressed air flow rate is 3m. 3 / h, the residence time of the fiber in the furnace is controlled at 1000s; the low-temperature carbonization treatment is carried out by passing through three rollers, the treatment temperature is 450°C-700°C (drawing -1.5%), and the residence time of the fiber in the furnace is controlled at 300s under nitrogen protection. High-temperature carbonization treatment is carried out on three-roll rollers at a temperature of 800°C to 1500°C (drawing 0.5%), and graphitization treatment is carried out on five-roll rollers at a treatment temperature of 2600°C (drawing 0.5%) under argon protection. The residence time i...

Embodiment 2

[0043]Using mesophase pitch as raw material, 2K pitch-based precursors were prepared by melt spinning, and the fiber diameter (average value) was 20 μm. After the wire unwinding machine automatically unwinds the wire, it is processed by three-roller rollers without melting. The processing temperature is 240°C-300°C (drawing 1%), and the compressed air flow rate is 3m. 3 / h, the residence time of the fiber in the furnace is controlled at 1000s; the low-temperature carbonization treatment is carried out by passing through three rollers, the treatment temperature is 450°C-700°C (drawing -1.5%), and the residence time of the fiber in the furnace is controlled at 300s under nitrogen protection. High-temperature carbonization treatment with three rollers at a temperature of 800°C to 1600°C (drawing 0.5%), graphitization at five rollers at a temperature of 2600°C (drawing 0.5%), under argon protection, the fiber The residence time in the furnace is controlled at 100s, and the passing...

Embodiment 3

[0045] Using mesophase pitch as raw material, 2K pitch-based precursors were prepared by melt spinning, and the fiber diameter (average value) was 20 μm. After the wire unwinding machine automatically unwinds the wire, it is processed by three-roller rollers without melting. The processing temperature is 240°C-300°C (drawing 1%), and the compressed air flow rate is 3m. 3 / h, the residence time of the fiber in the furnace is controlled at 1000s; the low-temperature carbonization treatment is carried out by passing through three rollers, the treatment temperature is 450°C-700°C (drawing -1.5%), and the residence time of the fiber in the furnace is controlled at 300s under nitrogen protection. High-temperature carbonization treatment with three rollers at a temperature of 800°C to 1600°C (drawing 0.5%), graphitization at five rollers at a temperature of 2600°C (drawing 0.5%), under argon protection, the fiber The residence time in the furnace is controlled at 100s, and the passin...

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Abstract

The invention discloses a high surface activity pitch-based graphite fiber and a preparation method thereof, and a resin-based composite material prepared based on the high surface activity pitch-based graphite fiber, and belongs to the technical field of preparation of carbon fibers. The preparation method comprises the steps of 1, using mesophase pitch as a raw material, and preparing pitch-based precursors with fiber diameters of 10 microns -30 microns via melt spinning; and 2, after winding the pitch-based precursors prepared in the step 1, sequentially performing active pay-off, non-melting treatment, low-temperature carbonizing treatment, high-temperature carbonizing treatment, graphitizing treatment, surface treatment (electrolysis), washing and drying, sizing and drying, and finalwinding, and thus acquiring pitch-based graphite fibers. According to the preparation method, via introduction of surface electrolysis and washing, under the condition that other performance of the pitch-based graphite fibers prepared according to the method are unvaried, the prepared resin-based composite material is greatly enhanced in interlaminar shear strength.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, and relates to a pitch-based graphite fiber with high surface activity, a preparation method thereof, and a resin-based composite material prepared based on the pitch-based graphite fiber. Background technique [0002] Pitch-based graphite fiber is a special fiber with a carbon content greater than 92% that is produced from petroleum pitch or coal pitch through refining, spinning, non-melting, carbonization or graphitization of pitch. It is a new material with excellent mechanical properties. It has excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity and thermal conductivity, and is an indispensable engineering material in the aerospace industry. [0003] However, the pitch-based graphite fiber without surface treatment has low interlaminar shear strength after being prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/76D06M15/55C08J5/06C08L63/00D06M101/40
CPCD06M11/76D06M15/55C08J5/06D06M2101/40D06M2200/40C08J2363/00
Inventor 康延涛高峰阁孙海成李文泉
Owner SHAANXI TIANCE NEW MATERIAL TECH
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