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Polyimide fiber thermal drafting furnace and method

A polyimide fiber and thermal drawing technology, which is applied in the thermal drawing furnace of polyimide fiber and the field of thermal drawing of polyimide fiber, can solve the problem that the mechanical properties of polyimide fiber cannot meet the requirements of use. lower problem

Active Publication Date: 2013-09-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this heat treatment furnace avoids the corrosion of the heating element by the exhaust gas, the mechanical properties of the obtained polyimide fiber are still low, which cannot meet the requirements of use.

Method used

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  • Polyimide fiber thermal drafting furnace and method
  • Polyimide fiber thermal drafting furnace and method
  • Polyimide fiber thermal drafting furnace and method

Examples

Experimental program
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Effect test

Embodiment 1

[0095] The polyimide precursor to be treated is hot-drawn in the hot-drawing furnace provided by the present invention, and drawn 2.0 times at 350°C under a nitrogen atmosphere (the oxygen content in the gas in the furnace is below 10ppm) to obtain polyimide Amine finished fibers.

[0096] The present invention carries out performance test on the obtained polyimide finished fiber, and the result shows that the breaking strength of the polyimide fiber obtained in this embodiment is 1.81GPa, the modulus is 15.65GPa, and the breaking elongation is 12.6%.

Embodiment 2

[0098] The polyimide fibrils to be treated are thermally drawn in the hot drawing furnace provided by the present invention, and stretched 2.8 times at 520°C under a nitrogen environment (the oxygen content in the gas in the furnace is below 10ppm), and the polyimide fibrils are obtained. Amine finished fibers.

Embodiment 3

[0104] The polyimide fibrils to be treated are thermally drawn in the hot drawing furnace provided by the invention, and drawn 2.5 times at 510°C in a nitrogen environment (the oxygen content in the gas in the furnace is below 10ppm), to obtain polyimide Imine finished fibers.

[0105] The present invention carries out the performance test of the finished fiber obtained, and the result shows that the breaking strength of the finished fiber obtained in this embodiment is 1.81GPa, the modulus is 18.95GPa, and the elongation at break is 9.32%.

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Abstract

Provided is a polyimide fiber thermal drafting furnace and method. The polyimide fiber thermal drafting furnace comprises a hearth, an S-shaped inertia gas pipeline, a heating device, a heat insulation layer, a furnace body and an annular gas stream pipeline. The hearth comprises an inner hearth and a thermal treatment cavity. The thermal treatment cavity is arranged in the inner hearth. The S-shaped inertia gas pipeline is arranged between the inner hearth and the treatment cavity, and a plurality of gas outlet holes are arranged on the S-shaped inertia gas pipeline. The heating device is arranged on an outer wall of the hearth. The heat insulation layer is arranged on the outside of the heating device. The furnace body is arranged on the outside of the heat insulation layer. The annular gas stream pipeline is arranged at two ports of the hearth. In the polyimide fiber thermal drafting furnace, oxygen content in hearth gas can be lower than 10ppm, an inertia gas atmosphere in the hearth is guaranteed, polyimide fiber can not be subjected to oxygenolysis in a thermal drafting process, and the mechanical performance of the polyimide fiber is improved.

Description

technical field [0001] The invention relates to the technical field of polyimide, in particular to a polyimide fiber thermal drawing furnace and a polyimide fiber thermal drawing method. Background technique [0002] With the development of science and technology, various high-tech fibers are playing an increasingly important role in national economic and social development. Polyimide fiber has become one of the important varieties of high-tech fibers due to its excellent properties such as radiation resistance, high temperature resistance, high strength and high modulus. [0003] In the prior art, a two-step method is often used to prepare polyimide fibers. The specific process is to synthesize polyamic acid first, then remove the solvent from the polyamic acid solution, and obtain polyimide after dehydration and cyclization. In the process of preparing polyimide fibers by the two-step method, the imidized fibers need to be drawn and heat-set at high temperature to obtain ...

Claims

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Application Information

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IPC IPC(8): D02J1/22D02J13/00
Inventor 李国民邱雪鹏刘芳芳吕晚香代学民高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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