A kind of polyacrylonitrile preoxidation treatment device and method

A technology of pre-oxidation treatment and polyacrylonitrile, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of carbon fiber quality reduction, achieve the effect of improving quality and avoiding man-made damage

Inactive Publication Date: 2016-02-10
JILIN UNIV
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  • Claims
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Problems solved by technology

[0003] In order to solve the problem in the prior art that the skin-core phenomenon occurs during the pre-oxidation process of polyacrylonitrile and lead to the reduction of carbon fiber quality, the present invention provides a polyacrylonitrile pre-oxidation treatment device and method

Method used

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  • A kind of polyacrylonitrile preoxidation treatment device and method
  • A kind of polyacrylonitrile preoxidation treatment device and method
  • A kind of polyacrylonitrile preoxidation treatment device and method

Examples

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Effect test

Embodiment 1

[0025] Preparations: follow figure 1 The polyacrylonitrile preoxidation treatment device assembled as shown; figure 1 Among them, 1 is a power traction mechanism, 2 is a microwave heating furnace, 3 is a sand-holding funnel, and 4 is polyacrylonitrile fiber.

[0026] Pre-oxidation treatment work:

[0027] (1) Turn on the microwave heating furnace 2 and set the heating temperature of the microwave heating furnace 2 to 200°C;

[0028] (2) Open the microwave heating furnace 2 to heat, move the microwave heating furnace 2 horizontally and open the sand-holding funnel 3, release the hydrogen peroxide solution in the sand-holding funnel 3 to drip the polyacrylonitrile fiber 4, and control the titration speed and The moving speed of microwave heating furnace 2 makes titration length just identical with the length of microwave heating furnace, and then reversely removes polyacrylonitrile fiber 4, and the whole process time of step (2) is controlled at about 50min;

[0029] (3) Rais...

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is that in step (3), the temperature in the furnace is set to 290°C.

Embodiment 3

[0037] The difference between this embodiment and Embodiments 1 and 2 is that the entire process time of step (2) is controlled within 60 minutes.

[0038] Except above embodiment, because the physical reaction of pre-oxidation treatment is carried out between 180~200 ℃, so the maximum temperature of step (1) heating can be set as 180~200 ℃; In the reaction, so it can be extended to 35 ~ 40min.

[0039] The result that embodiment 1 to embodiment 3 obtains carries out scanning electron microscope test (see Figure 2 to Figure 5 ), it was found that the polyacrylonitrile pre-oxidized wire obtained by the method of the present invention can hardly observe the skin-core structure, which proves that the method of the present invention can reduce the skin-core effect.

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Abstract

The invention relates to a polyacrylonitrile pre-oxidation treatment device and a polyacrylonitrile pre-oxidation treatment method, belonging to the technical field of preparing carbon fibers. A movable microwave heating furnace (2) is adopted, the wire traveling speeds of the movable microwave heating furnace (2) and polyacrylonitrile fiber (4) are synchronous and controllable, the movable heating furnace can form air convection together with moving polyacrylonitrile fiber, so that reaction heat caused by side effect can be taken away well, and the quality of pre-oxidized fibers is improved. A sand containing hopper (3) with controllable titration speed is fixed on one side of the microwave heating furnace (2), and used for titrating oxidant solution on the pre-oxidized fibers, thus omitting the complicated process of soaking, then taking out again and the like, and preventing the artificial destruction of a precursor structure. By adopting microwave heating principle, oxygen molecules in the oxidant solution take part in pre-oxidization reaction inside, the pre-oxidization degree can achieve consistency inside and outside as far as possible, thus achieving the purpose of reducing the skin-core effect.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and relates to a device and method for preoxidation treatment of polyacrylonitrile. Background technique [0002] Carbon fiber is an important new type of material today, and it has been widely used in national defense, military, aerospace and other civilian industries. At present, most carbon fibers are made of polyacrylonitrile (PAN) after pre-oxidation and carbonization. The conditions and technologies for the development of carbon fiber in my country have been significantly improved, but there are still many bottlenecks that have not yet been resolved. Among them, pre-oxidation is a crucial process in the production of PAN-based carbon fiber. In this process, the linear molecular chain of the precursor is gradually transformed into a heat-resistant trapezoidal structure. Factors such as temperature setting and draft setting in this process Not only the quality of carbon fib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/32D01F9/22
Inventor 高忠民赵瑞雪唐海通姚斌
Owner JILIN UNIV
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