Polyacrylonitrile pre-oxidation processing device and method

A pre-oxidation, polyacrylonitrile technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of reducing the quality of carbon fibers, and achieve the effect of improving quality and avoiding human damage.

Inactive Publication Date: 2019-03-05
屈江妮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 polyacrylonitr...

Method used

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  • Polyacrylonitrile pre-oxidation processing device and method
  • Polyacrylonitrile pre-oxidation processing device and method
  • Polyacrylonitrile pre-oxidation processing device and method

Examples

Experimental program
Comparison scheme
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 the 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) ...

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 discloses a polyacrylonitrile pre-oxidation processing device, and a method, and belongs to the technical field of carbon fiber preparation. According to the polyacrylonitrile pre-oxidation processing device, a mobile microwave heating furnace (2) is adopted, and the wire travelling speed of the microwave heating furnace (2) and the wire travelling speed of polyacrylonitrile fiber (4) are designed to be synchronous and controllable; air cross-ventilation is formed by the mobile microwave heating furnace and the mobile polyacrylonitrile fiber, so that reaction heat generated in side reaction is diminished preferably, and pre-oxidized fiber quality is improved; one side of the microwave heating furnace (2) is fixedly provided with a sand core funnel (3) with controllable titration speed, and the sand core funnel is used for titration of pre-oxidized fiber with an oxidizing agent solution, so that complex steps of immersion and taking out from an immersion solution are avoided, and man-made sabotage on original wire structures is avoided. Microwave heating principles are adopted for internal pre-oxidation of oxygen molecules in the oxidizing agent solution, the pre-oxidation degree is uniform from outside to inside, and skin and core effect is reduced.

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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IPC IPC(8): D01F9/32D01F9/22
CPCD01F9/22D01F9/32
Inventor 屈江妮
Owner 屈江妮
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