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Preparing method of polyimide fiber

A technology of polyimide fiber and polyamic acid, applied in spinning solution preparation, wet spinning, drawing spinning, etc., can solve problems such as high toxicity

Inactive Publication Date: 2016-11-23
高海燕
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage is the use of phenolic solvents, which are highly toxic; the last is the two-step solution spinning, because the solubility of polyamic acid is better, so the two-step process solves the problem of solvent selection in the production process of polyamic acid fibers. sexual conundrum

Method used

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Embodiment Construction

[0019] In order to enable those skilled in the art to better understand the solution of the present invention, the content of the present invention will be further introduced in conjunction with specific embodiments, but it should be noted that the following specific embodiments are only for understanding the technology, and do not constitute rights. limit.

[0020] A kind of preparation method of polyimide fiber, its main steps comprise: a, the preparation of polyamic acid solution, utilize 2-(4-aminophenyl)-5-aminobenzimidazole (BIA), p-phenylenediamine (p-PDA) and 3,3',4,4'-biphenyltetracarboxylic anhydride (BPDA) were used to prepare BPDA / (p-PDA / BIA)(BPB) system ternary copolymerization polyamic acid. Because the technical scheme adopts two-step spinning, it is necessary to first synthesize the polyamic acid spinning solution. In addition, in the process of polyamic acid synthesis, by introducing 2-(4-aminophenyl)-5-aminobenzimidazole (BIA), BPDA / (p-PDA / BIA)(BPB) system t...

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Abstract

The invention discloses a preparing method of polyimide fiber. The preparing method includes the following steps that three raw materials including 2-(4-aminophenyl)-5-aminobenzimidazole (BIA), p-phenylenediamine (p-PDA) and 3,3',4,4'-biphenyl tetramethyl anhydride (BPDA) are used for preparing BPDA / (p-PDA / BIA)(BPB) system ternary polymerization polyamide acid; bubble removal is carried out on the prepared ternary polymerization polyamide acid, and two-step method wet spinning is adopted to prepare polyamide acid fiber; imidization is carried out on the polyamide acid fiber at the temperature of 450-500 DEG C for intramolecular dehydration; rolling and aftertreatment are carried out finally. The prepared polyimide fiber is excellent in mechanical performance and surface performance, and the method is simple and environmentally friendly.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to the field of polyimide fiber materials. Background technique [0002] Polyimide fiber not only has the characteristics of high strength and high modulus, but also has better thermo-oxidative stability, very strong acid corrosion resistance, excellent radiation resistance and flame retardancy compared with other high-performance fibers. It is very likely to be used in aerospace, atomic energy industry, space environment, rescue needs, high temperature, radioactivity, filtration of organic gases or liquids, fire blankets, fire-resistant and flame-retardant clothing and other fields. [0003] The preparation method of existing polyimide fiber generally has following several kinds: the one, melt spinning method, its advantage is that spinning machine equipment is mature, but because the synthetic thermoplastic polyimide molecular weight is not high, the obtained polyimide The mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78C08G73/10D01D5/06D01D1/10D01D5/12D01D1/02D01D10/02
CPCD01F6/78C08G73/1067D01D1/02D01D1/103D01D5/06D01D5/12D01D10/02
Inventor 高海燕
Owner 高海燕
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