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Method for preparing polyacrylonitrile, acrylonitrile copolymer and mixture material thereof

A technology of acrylonitrile copolymer and polyacrylonitrile, which is applied in the preparation of acrylonitrile copolymer and its blend materials, and in the field of polyacrylonitrile, which can solve the problems affecting the mechanical properties of products, low crosslink density, thermal stress defects, etc. , to achieve the effects of improved mechanical properties and temperature resistance, shorter use time, and higher cross-linking density

Inactive Publication Date: 2010-04-14
刘剑洪 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing pre-oxidation treatment of polyacrylonitrile (PAN) precursors is generally completed through temperature and time control in an air or oxygen atmosphere, requiring a heating furnace (heating device) to heat up, which takes a long time. Long, the crosslinking density is relatively small, and the thermal stress in the processing process is easy to cause defects, affecting the mechanical properties of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take commercially available polyacrylonitrile fiber precursors, and use an electron beam accelerator to irradiate and cross-link in He gas at room temperature, with an irradiation dose of 2MGy. The irradiated samples were kept at 130°C for 1 hour for thermal oxidation reaction to obtain polyacrylonitrile precursors with a high degree of crosslinking, which were used to prepare high-performance carbon fibers.

[0018] The physical properties of the materials prepared in this example are shown in Table 1.

Embodiment 2

[0020] Raw material composition (weight percentage): polyacrylonitrile 70%, acrylonitrile copolymer 25%, tris(trimethylol)propane methacrylate (TMPT) 5%.

[0021] Accurately weigh each component, use an extruder to blend polyacrylonitrile, acrylonitrile copolymer, and TMPT, and extrude.

[0022] At normal temperature, normal pressure, and air atmosphere, one or more radiation pretreatments are carried out with electron beams, and the cumulative radiation dose is 50kGy to obtain polyacrylonitrile and acrylonitrile copolymer mixture materials.

[0023] The physical properties of the materials prepared in this example are shown in Table 1.

Embodiment 3

[0025] Raw material composition (weight percentage): polyacrylonitrile oligomer 97%, tris(trimethylol)propane methacrylate (TMPT) 3%.

[0026] Accurately weigh each component, pour each component into the impregnation device, mix well, and heat to 50°C; immerse the pre-dried commercially available carbon fiber in the above liquid mixture, soak for 60 minutes, take it out, and drain the surface of the fiber liquid, ready to use.

[0027] Under the condition of He gas, the above-mentioned materials were irradiated and cross-linked, and γ-ray (Co60) was used to irradiate the cross-linking, the irradiation dose was 3kGy, and the irradiated samples were left for 48 hours.

[0028] The material after standing was irradiated and cross-linked again by γ-ray (Co60) in the air, kept at 200°C for 1 h, and thermal oxidation reaction was carried out to obtain cross-linked polyacrylonitrile reinforced carbon fiber pre-oxidized filaments.

[0029] The physical properties of the materials pr...

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PUM

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Abstract

The invention relates to a method for preparing polyacrylonitrile, an acrylonitrile copolymer and a mixture material thereof. One or multiple radiation cross linking is carried out from normal temperature to 135 DEG C under the condition of an inert atmosphere or air to obtain the crosslinking polyacrylonitrile, the acrylonitrile copolymer and the mixture material thereof with excellent mechanical performance and heat resistance. The crosslinking polyacrylonitrile, the acrylonitrile copolymer and the mixture thereof prepared by the method are applied to carbon materials, such as carbon fibers, carbon pipes, carbon films, carbon felt, carbon rods, and the like and a composite material thereof and can greatly improve the strength and the modulus of the materials, improve the heat resistance and have simple process.

Description

technical field [0001] The invention relates to a preparation method of a polymer material, in particular to a preparation method of polyacrylonitrile, acrylonitrile copolymer and blend materials thereof. Background technique [0002] Carbon materials have excellent comprehensive properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, thermal conductivity, radiation resistance, shock absorption, and noise reduction, and have been widely used in aerospace, etc. field. Polyacrylonitrile, acrylonitrile copolymers and their blends are precursors (prepolymers) for preparing carbon fibers, carbon tubes, carbon films, carbon rods and their composite materials. Polyacrylonitrile-based carbon fibers are prepared from polyacrylonitrile (PAN) precursors through three main stages of pre-oxidation, carbonization and graphitization. If high-quality PAN precursors ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08J3/24C08L33/20D01F11/06D01D10/00B29C71/04D06M15/31D06M101/40
Inventor 刘剑洪贵大勇徐坚
Owner 刘剑洪
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