Post-treatment new process for aramid fibre III raw tow

Abstract

The aramid III fiber as a new kind of high-strength material has wide application. Aramid III liquid is prepared with the materials including p-phenlenediamine, terephthalyl chloride and 5(6)-amino-2-(3-aminophenyl) benzimidazole and through low temperature copolymerization in dimethyl acetamide solvent; and is produced into aramid III fiber through serial spinning steps. The present invention provides the post-treatment technological process to raise the strength of aramid III fiber from 1.5 GPa to 4.5 GPa. The post-treatment process includes the treatment in the apparatus comprising tensioner, oiling machine, heating furnace and winding machine with the tension controlled in 0.2-1.0 CN / tex, temperature inside the nitrogen protected furnace 320-500 deg.c, and heating time 0.5-5 min. The raw tow is heated under motion inside the furnace homogeneously.

Description

technical field [0001] The invention relates to a production process of high-strength, high-modulus fiber, specifically a post-treatment process of aramid fiber III raw tow. Background technique [0002] With the development of aerospace technology, higher and higher requirements are put forward for reinforcing fibers. In the past, the international research on aramid fiber mainly focused on the American Kevlar series. Its maximum strength only reached 3.4GPa, and its modulus was 120GPa, which was far from meeting the requirements of the aerospace sector for the minimum fiber strength of 4.2GPa. In the 1980s, Russia developed a kind of Apmoc fiber composed of ternary copolymerization, which is called aramid IH fiber in China. It is a kind of aramid-benzimidazole copolymerized fiber. Because of its strength reaches 4.0-5.0GPa and tensile modulus 130-148GPa, this excellent comprehensive performance has aroused great interest and attention from all over the world. It can not ...

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Problems solved by technology

The reason is that the production process of this process is not continuous. After filtering, degassing, spinning, precipitating, washing, and drying from the original solution, the raw silk is wound up on the silk drum, and the first step is completed to prepare aramid III. The second step of the process of raw silk is to put the aramid III raw silk tube into the heat treatment kettle for post-strengthening treatment. Since the raw silk bundle wound on the aramid III raw silk tube has a certain thickness, it is heated in the treatment kettle Uniformity is difficult to guarantee, especially in the multi-station filament tube in the heat treatment tank, the performance between the tube and the tube, between the inner and outer fiber bundles of a single tube, and between batches of fiber bundles produced in different tanks. There are large differences, which directly affect the improvement of product yield

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