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Large tow polyacrylonitrile pre-oxidized fiber, large tow carbon fiber, and preparation methods of large tow polyacrylonitrile pre-oxidized fiber and large tow carbon fiber

A technology of polyacrylonitrile pre-oxidized yarn and polyacrylonitrile fiber, which is applied in fiber treatment, ultrasonic/sonic fiber treatment, textile and papermaking, etc., and can solve the problem of reducing heat release of large tow polyacrylonitrile fiber and pre-oxidized silk skin. The core structure is serious, reducing the pre-oxidation time and other problems, to achieve the effect of maintaining the degree of orientation, reducing the pre-oxidation time, and reducing curl

Inactive Publication Date: 2018-08-14
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the large heat release, large energy consumption, high reaction temperature and long reaction time in the preparation process of the existing large-tow polyacrylonitrile pre-oxidized yarn, and the pre-oxidized yarn sheath-core produced Defects such as severe structure, provide a large-tow polyacrylonitrile pre-oxidized yarn, large-tow carbon fiber and its preparation method
The preparation method of the present invention significantly reduces the heat release of the large-tow polyacrylonitrile fiber during the pre-oxidation process, reduces the pre-oxidation temperature, and reduces the Energy consumption, while introducing oxygen elements, solving the problem of oxygen diffusion, and reducing pre-oxidation time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of large tow polyacrylonitrile pre-oxidized silk is as follows:

[0037] (1) Large tow polyacrylonitrile fiber (with the sample of comparative example 1) is pre-wound on the reel and placed on the wire unwinding machine, passing through the front drafting device, the lower driving device of the bundle, the rear drafting device and Pre-oxidation furnace, after the electron accelerator is turned on, the electron beam energy is 0.5MeV, and each transmission device is turned on to draw large tow polyacrylonitrile fibers through the irradiation window of the electron beam accelerator for continuous irradiation reaction; the drafting speed is 10m / min, the speed ratio of the front drafting device, the lower beam transmission device and the rear drafting device is 1:1:0.98; the radiation absorbed dose rate is 0.3×10 5 Gy / s, the total radiation absorbed dose is 30kGy;

[0038] (2) The large tow polyacrylonitrile fiber after irradiation is pre-oxidized to...

Embodiment 2

[0042] The preparation method of large tow polyacrylonitrile preoxygenated silk is the same as embodiment 1, and the difference is only in:

[0043] The electron beam energy is 8.0MeV, and the radiation absorbed dose rate is 2×10 5 Gy / s, the drafting speed is 5m / min, the speed ratio of the front drafting device, the lower beam transmission device and the rear drafting device is 1:1:0.96, the total radiation absorption dose is 400kGy; 3 pre-oxidation temperature zones , the pre-oxidation temperature is 210°C, 240°C, 268°C, the pre-oxidation time is 35min, and the draft ratio in the pre-oxidation temperature range is 1:1.1:0.95.

[0044] The cyclization exothermic heat of the obtained polyacrylonitrile pre-oxidized yarn is 512.03J / g, and the density before pre-oxidation is 1.18g / cm -3 , the density after preoxidation is 1.35g / cm -3 .

[0045] Carry out carbonization treatment on the polyacrylonitrile pre-oxidized yarn: low-temperature carbonization temperature is 500-700°C, c...

Embodiment 3

[0047] The preparation method of large tow polyacrylonitrile preoxygenated silk is the same as embodiment 1, and the difference is only in:

[0048] The electron beam energy is 2.0MeV, and the radiation absorbed dose rate is 1×10 6 Gy / s, the drafting speed is 1m / min, the speed ratio of the front drafting device, the lower beam transmission device and the rear drafting device is 1:1:1, the total radiation absorption dose is 1000kGy; 5 pre-oxidation temperature zones , the pre-oxidation temperature is 205°C, 225°C, 240°C, 255°C, 270°C, the pre-oxidation time is 75min, and the draft ratio in the pre-oxidation temperature range is 1:1:1:1.1:0.98.

[0049] The cyclization exothermic heat of gained polyacrylonitrile preoxidation silk is 424.15J / g, and the density before preoxidation is 1.18g / cm -3 , the density after preoxidation is 1.38g / cm -3 .

[0050] Carry out carbonization treatment on the polyacrylonitrile pre-oxidized yarn: low-temperature carbonization temperature is 500...

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Abstract

The invention discloses large tow polyacrylonitrile pre-oxidized fiber, large tow carbon fiber, and preparation methods of the large tow polyacrylonitrile pre-oxidized fiber and the large tow carbon fiber. The preparation method of the large tow polyacrylonitrile pre-oxidized fiber comprises: 1, after an electron accelerator is turned on, carrying out a continuous irradiation reaction on large towpolyacrylonitrile fiber, wherein the irradiation absorption dose rate is 50-2*10<6> Gy / s, and the total irradiation absorption dose is 20-3000 kGy; and 2, carrying out pre-oxidation on the irradiatedlarge tow polyacrylonitrile fiber for 15-75 min at a temperature of 180-280 DEG C so as to obtain the large tow polyacrylonitrile pre-oxidized fiber, wherein the large tow polyacrylonitrile pre-oxidized fiber is carbonized to obtain the carbon fiber. According to the present invention, with the preparation method, the heat release during the pre-oxidation of the polyacrylonitrile fiber can be significantly reduced, the pre-oxidation temperature can be reduced, the energy consumption can be reduced, and the oxygen is introduced so as to solve the oxygen diffusion problem and reduce the pre-oxidation time; and the large tow polyacrylonitrile pre-oxidized fiber has advantages of high density and high strength, and the subsequently-prepared carbon fiber material has excellent performance.

Description

technical field [0001] The invention relates to a large tow polyacrylonitrile preoxidized yarn, a large tow carbon fiber and a preparation method thereof. Background technique [0002] Polyacrylonitrile fiber is a polymer fiber material widely used in the fields of clothing, decoration, construction and carbon fiber preparation. It is also the main raw material for the production of carbon fiber pre-oxidized yarn and carbon fiber. There are two types of polyacrylonitrile fibers used in the production of pre-oxidized silk and carbon fibers. The number of fibers per bundle is 24K to 540K (46000 to 540000 per bundle) called large tow polyacrylonitrile fibers. Each bundle of fibers The number of fibers is 1 to 24K, which is called small tow polyacrylonitrile fiber. Large-tow polyacrylonitrile fiber is the main raw material for preparing large-tow pre-oxidized yarn and large-tow carbon fiber. In addition to being used to produce large-tow carbon fibers, large-tow pre-oxidized y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M10/02D01F9/22
CPCD01F9/22D06M10/025
Inventor 张文礼吴国忠王谋华刘伟华张文发李诚
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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