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Polyimide fiber heat treatment method and heat treatment device

A technology of polyimide fiber and heat treatment method, applied in chemical post-treatment of synthetic polymer rayon filament, chemical characteristics of fiber, single-component synthetic polymer rayon, etc., can solve the problem of large thermal shock load and poor fiber performance , poor temperature uniformity, etc., to achieve the effect of good thermal stability, high monofilament strength and space saving

Active Publication Date: 2021-10-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that in the heat treatment method of polyimide fiber existing in the prior art, the problem of poor temperature uniformity and large thermal shock load causes poor performance of the fiber, and a heat treatment method of polyimide fiber is proposed , this method has the advantages of high spinning efficiency, good fiber monofilament strength and thermal stability

Method used

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  • Polyimide fiber heat treatment method and heat treatment device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The PAA primary fiber is placed on the wire feeder, and enters the stacked hot furnace at a speed of 10m / min for imidization treatment. The imidization process adopts the method of gradually increasing the temperature. The furnace has a length of 3m and a total of 5 floors. The first layer is 120°C, the second layer is 180°C, the third layer is 260°C, the fourth layer is 350°C, the fifth layer is 450°C, and the temperature uniformity is ±5°C. Nitrogen protection is used during the imidization process, and the oxygen content is not more than 100ppm.

[0027] Among them, the diameter of the heat roller is 80mm, and the surface temperature from low to high is 120°C, 180°C, 260°C, and 350°C, respectively, and the heat roll is also in a nitrogen environment. Each group of drafting rollers has an independent motor, and the fiber speed is 6m / min. A certain multiple of drafting is achieved through the speed difference between the front and rear drafting machines. The drafting ...

Embodiment 2

[0031] Put the PAA fiber on the wire feeder, and enter the stacked hot furnace at a speed of 30m / min for imidization treatment. The imidization process adopts a gradual temperature increase method. The furnace has a length of 6m and a total of 5 floors. The first layer is 120°C, the second layer is 180°C, the third layer is 260°C, the fourth layer is 350°C, the fifth layer is 450°C, and the temperature uniformity is ±5°C. Nitrogen protection is used during the imidization process, and the oxygen content is not more than 100ppm.

[0032] Among them, the diameter of the heat roller is 80mm, and the surface temperature from low to high is 120°C, 180°C, 260°C, and 350°C, respectively, and the heat roll is also in a nitrogen environment. Each group of drafting rollers has an independent motor, and the fiber speed is 6m / min. A certain multiple of drafting is achieved through the speed difference between the front and rear drafting machines. The drafting ratios from the first layer ...

Embodiment 3

[0035] Put the PAA fiber on the wire feeder and enter the stacked hot furnace at a speed of 50m / min for imidization treatment. The imidization process adopts a gradual temperature increase method. The furnace has a length of 10m and a total of 5 floors. The first layer is 120°C, the second layer is 180°C, the third layer is 260°C, the fourth layer is 350°C, the fifth layer is 500°C, and the temperature uniformity is ±5°C. Nitrogen protection is used during the imidization process, and the oxygen content is not more than 100ppm.

[0036] Among them, the diameter of the hot roller is 300mm, the surface temperature is 120°C, 180°C, 260°C, and 350°C from low to high, respectively, and the hot roller is also in a nitrogen environment. Each group of drafting rollers has an independent motor, and the fiber speed is 6m / min. A certain multiple of drafting is achieved through the speed difference between the front and rear drafting machines. The drafting ratios from the first layer to ...

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Abstract

The invention relates to a polyimide fiber heat treatment method and a heat treatment device, which mainly solve the problems of poor temperature uniformity and large thermal shock load in the polyimide fiber heat treatment method in the prior art, resulting in poor fiber performance. The present invention adopts a polyimide fiber heat treatment method, which is characterized in that the polyimide nascent fiber is imidized through a hot furnace containing multiple heating channels, and passed through a drafting machine before or / and after the heating channel Drawing is carried out to obtain polyimide fibers; wherein, the technical scheme in which the heating channels are stacked parallel to each other solves this problem better, and has the advantages of high spinning efficiency, good fiber monofilament strength and thermal stability , can be used in the industrial production of polyimide fibers.

Description

technical field [0001] The invention relates to a polyimide fiber heat treatment method and a heat treatment device Background technique [0002] As a kind of high-performance fiber, polyimide (PI) fiber has excellent properties such as high strength and high modulus, high and low temperature resistance, and radiation resistance, and can be widely used in aerospace, high temperature filtration, fire protection and other fields. At present, the two-step process has gradually become the mainstream direction of PI high-performance fiber development. After spinning polyamic acid solution, it is imidized at high temperature and drawn to obtain finished fibers. The polyamic acid primary fiber cyclization and high-temperature drawing technology involved in this play a crucial role in the performance of the final fiber. [0003] In relevant literature and patent reports, the conventional PI fiber heat treatment method is to place the tow in a hot box with different temperatures, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F11/08D01F6/74
CPCD01F6/74D01F11/08
Inventor 陈雪崔晶孙旭阳刘京妮
Owner CHINA PETROLEUM & CHEM CORP
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