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Method and pre-oxidation furnace for regulating and controlling homogenization of carbon fiber pre-oxidized filaments

A technology of pre-oxidation furnace and pre-oxidation yarn, which is applied in the fields of fiber chemical characteristics, textiles and paper making, and can solve the problems of affecting the cyclization reaction inside the fiber, affecting the mechanical properties of carbon fiber, hindering oxygen diffusion, etc.

Pending Publication Date: 2020-02-28
HENAN YONGMEI CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional pre-oxidation process, as the cyclization reaction proceeds, the outer layer of the fiber forms a dense network trapezoidal structure, which hinders the diffusion of oxygen in the air to the inside of the fiber, so that the oxidation of the pre-oxidized silk skin is sufficient or even excessive, while the core However, insufficient pre-oxidation affects the cyclization reaction inside the fiber, hinders the transformation of the fiber core structure, causes the fiber core structure to be loose, and forms a skin-core structure
During the carbonization process, the loose core will form a cavity in the carbon fiber core, which becomes the breaking point of the carbon fiber when it is stretched, and affects the mechanical properties of the carbon fiber.

Method used

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  • Method and pre-oxidation furnace for regulating and controlling homogenization of carbon fiber pre-oxidized filaments

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Embodiment 1

[0060] This embodiment provides a carbon fiber, which uses figure 2 The pre-oxidation furnace 100 shown is prepared according to the following preparation method:

[0061] Put the 1m-long PAN original yarn 110 (tensile strength 500MPa) evenly on the original yarn hanger 112, hang a certain weight on the lower end of the PAN original yarn 110 as a drafting load 108 (0.08g / d), infrared The heating tube 111 selects a medium-wave infrared transmitter with a power of 5 KW, a length of 1.5 meters, and a peak wavelength of 2.7 μm, and the temperature is controlled by a thyristor and an infrared thermometer. The heating temperature gradient of PAN raw yarn 110 is 180℃, 200℃, 215℃, 230℃, 240℃, 250℃, 260℃, 270℃, 275℃, a total of 9 heating gradients, and the corresponding holding time is 10 minutes. The temperature rise rate between gradients is controlled at 1~5℃ / min, and the temperature difference is controlled at ±3℃. The temperature difference between the circulating air temperature i...

Embodiment 2

[0064] This embodiment provides a carbon fiber, the preparation method of which is roughly the same as that of Example 1, except that the drafting tension is 0.20 g / d, and the carbon fiber is finally obtained. A total of 3 sets of parallel samples were made, namely parallel sample 1, parallel sample 2, and parallel sample 3.

[0065] Table 2 The main performance indicators of carbon fiber under different pre-oxidation conditions

[0066]

[0067] In summary, the method for regulating the homogenization of carbon fiber pre-oxidized filaments and the pre-oxidizing furnace in the embodiments of the present invention use infrared heating inside the fiber, hot air heating the outer layer of the fiber, combined with the convection temperature control fiber outer layer, to ensure that oxygen flows into the fiber The permeation of the pre-oxygenated wire finally achieves the goal of regulating the homogenization of the pre-oxygenated wire.

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Abstract

The invention relates to the field of carbon fiber pre-oxidation, in particular to a method and pre-oxidation furnace for regulating and controlling homogenization of carbon fiber pre-oxidized filaments. The method for regulating and controlling the homogenization of the carbon fiber pre-oxidized filaments according to an embodiment of the invention includes drawing precursors to perform pre-oxidation; in the pre-oxidation process, the precursors are heated in an integrated heating mode of infrared heating and hot air heating, and heat is dissipated in a forced air convection mode. The pre-oxidation furnace for regulating and controlling the homogenization of the carbon fiber pre-oxidized filaments comprises a hearth for containing precursors, a drawing system for drawing the precursors, an infrared heating device for carrying out infrared heating on the precursors, an electric heating wire heating device for carrying out thermal heating on the precursors, and a ventilation system forforming convective air in the hearth. According to the method and pre-oxidation furnace for regulating and controlling the homogenization of the carbon fiber pre-oxidized filaments, the inside of fibers is heated by infrared, the outer layer of the fibers is heated by hot air, the outer layer of the fibers is subjected to convection temperature control so that the permeation of oxygen to the inside of the fibers is guaranteed, and the purpose of regulating and controlling the homogenization of the pre-oxidized filaments is finally achieved.

Description

Technical field [0001] The invention relates to the field of carbon fiber pre-oxidation, and in particular to a method for regulating and controlling the homogenization of carbon fiber pre-oxidation filaments and a pre-oxidation furnace. Background technique [0002] Carbon fiber refers to a high tensile strength and high tensile modulus fiber with a carbon content of more than 90%. It has many advantages such as low density, high temperature resistance, corrosion resistance, and fatigue resistance. It is widely used in weapons, aerospace, construction, Automobiles and ships, medical and industrial equipment, sports and leisure products, etc. At present, polyacrylonitrile fiber (PAN) is mainly used to prepare high-performance carbon fiber, that is, PAN-based carbon fiber. The production steps of carbon fiber generally include polymerization, spinning, pre-oxidation, carbonization, post-treatment and other steps. At present, the highest tensile strength of industrially produced ...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/32
CPCD01F9/22D01F9/328
Inventor 李志鹏王俊峰姚冬王永国李超吴海南
Owner HENAN YONGMEI CARBON FIBER
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