A kind of heat treatment modification method of PBO fiber

A heat treatment modification, fiber technology, applied in the heat treatment modification of PBO fiber, the field of PBO fiber modification, can solve the problems of unreasonable heat treatment process, low fiber strength and modulus, etc., to eliminate adverse effects, fiber strength and High modulus, effect of improving crystallinity and orientation

Active Publication Date: 2017-07-04
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem of unreasonable heat treatment process in the production of PBO fiber in the prior art, resulting in low fiber strength and modulus, and provides a heat treatment modification method for PBO fiber, which can improve the strength and strength of PBO fiber. Modulus

Method used

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  • A kind of heat treatment modification method of PBO fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A heat treatment modification method of PBO fiber includes the following process steps:

[0035] A. Enter the heat treatment channel

[0036] The PBO fiber obtained by spinning is controlled to have a moisture content of 5%, and then enters the segmented heat treatment channel under an inert atmosphere; the segmented heat treatment channel includes a preheating section, a heat treatment section and a cooling section;

[0037] B. Preheating section

[0038] Put the PBO fiber into the preheating section first, and the temperature will gradually increase, and control the temperature of the preheating section to 100-550℃;

[0039] C. Heat treatment section

[0040] The PBO fiber after the preheating section enters the heat treatment section, and the temperature of the heat treatment section is controlled to be 550-630℃;

[0041] D, cooling section

[0042] The PBO fiber after the heat treatment section finally enters the cooling section, the temperature is gradually reduced, and the tem...

Embodiment 2

[0044] A heat treatment modification method of PBO fiber includes the following process steps:

[0045] A. Enter the heat treatment channel

[0046] The PBO fiber obtained by spinning is controlled to have a moisture content of 45%, and then enters the segmented heat treatment channel under an inert atmosphere; the segmented heat treatment channel includes a preheating section, a heat treatment section and a cooling section;

[0047] B. Preheating section

[0048] Put the PBO fiber into the preheating section first, and the temperature will gradually increase, and control the temperature of the preheating section to 100-550℃;

[0049] C. Heat treatment section

[0050] The PBO fiber after the preheating section enters the heat treatment section, and the temperature of the heat treatment section is controlled to be 550-630℃;

[0051] D, cooling section

[0052] The PBO fiber after the heat treatment section finally enters the cooling section, the temperature is gradually reduced, and the te...

Embodiment 3

[0054] A heat treatment modification method of PBO fiber includes the following process steps:

[0055] A. Enter the heat treatment channel

[0056] The PBO fiber obtained by spinning is controlled to have a moisture content of 25%, and then enters the segmented heat treatment channel under an inert atmosphere; the segmented heat treatment channel includes a preheating section, a heat treatment section and a cooling section;

[0057] B. Preheating section

[0058] Put the PBO fiber into the preheating section first, and the temperature will gradually increase, and control the temperature of the preheating section to 100-550℃;

[0059] C. Heat treatment section

[0060] The PBO fiber after the preheating section enters the heat treatment section, and the temperature of the heat treatment section is controlled to be 550-630℃;

[0061] D, cooling section

[0062] The PBO fiber after the heat treatment section finally enters the cooling section, the temperature is gradually reduced, and the te...

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Abstract

The invention relates to a thermal treatment modification method for PBO (Poly-p-phenylene ben-zobisthiazole) fibers, and belongs to the technical field of macromolecular fiber modification. The thermal treatment modification method for the PBO fibers comprises entering a thermal treatment channel, a preheating section, a thermal treatment section and a cooling section. According to the thermal treatment modification method, the PBO fibers enter the sectional type thermal treatment channel through a tension roller; the preheating section and the cooling section which are additionally arranged in the sectional type thermal treatment channel have an important role in improving the intensity and the modulus of the fibers; as water has a plastification effect, in a preheating process of the preheating section, movement of a molecule chain is facilitated, the mutual action between the specific moisture content and the preheating section is controlled, and the crystallizing degree and the orientation degree of the fibers in the thermal treatment section are improved; finally, due to the cooling section additionally arranged in the sectional type thermal treatment channel, the fibers subjected to thermal treatment can be effectively prevented from being directly exposed in the air, so that high-temperature thermo-oxidative degradation of the fibers in hot air is effectively reduced, and the intensity and the modulus of the treated fibers are greatly improved.

Description

Technical field [0001] The present invention relates to a modification method of PBO fiber, more specifically, the present invention relates to a heat treatment modification method of PBO fiber, belonging to the technical field of polymer fiber modification. Background technique [0002] PBO is the abbreviation of poly(p-phenylene benzodioxazole). PBO fiber is a high-performance fiber made by spinning PBO polymer. The tensile breaking strength is 5.8 GPa, the Young's modulus is 280 GPa, and it is thermally decomposed. The temperature is 650°C, 100°C higher than the aramid fiber, and the limiting oxygen index (LOI) is 68. It is known as the "super fiber of the 21st century" and can be used in the aerospace field, such as: spacecraft structural materials, space suits, Mars The balloon film of the detector, body armor, bullet-proof helmet, impact-resistant materials of the aircraft fuselage, and missile protection equipment. [0003] The domestic research on PBO polymerization first ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D10/02
Inventor 许伟严家策冉茂强范新年赵亮郭玲黄治川付兴伟胡娟
Owner CHINA BLUESTAR CHENGRAND CO LTD
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