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Polyimide fiber containing amido link structure and preparation method thereof

A polyimide fiber and amide-containing technology are applied in the field of polyimide fiber containing amide bond structure and its preparation, which can solve the problem of low mechanical properties of PMDA-ODA type polyimide fiber and achieve mechanical strength. The effect of improving and improving mechanical strength and tensile strength

Inactive Publication Date: 2010-05-19
SINOSELEN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned result shows that the mechanical property of the obtained PMDA-ODA type polyimide fiber is not high

Method used

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  • Polyimide fiber containing amido link structure and preparation method thereof
  • Polyimide fiber containing amido link structure and preparation method thereof
  • Polyimide fiber containing amido link structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of the polyimide fiber of embodiment one is as follows:

[0042] 1. Synthesis of polyamic acid solution: according to the molar ratio of PMDA:ODA:DABA=10:9:1, first add ODA and DABA two diamine monomers into the metered solvent N-methylpyrrolidone to make the total solution The solid content was 12wt%, and then stirred under the protection of nitrogen to dissolve all ODA and DABA, then added PMDA and stirred, and continued to react at 10°C for 15 hours in a nitrogen atmosphere to obtain a viscous polyamic acid homogeneous solution. Its intrinsic viscosity is 3.5dL / g.

[0043] 2. Polyamic acid fiber spinning: The obtained polyamic acid solution is filtered, defoamed, and polyamic acid fiber is obtained according to the conventional dry spray wet spinning process, wherein the number of spinneret holes used is 30~100 holes, and the pore size is 0.1 mm; the coagulation bath used is a mixture of ethanol and water (the weight ratio of ethanol and water...

Embodiment 2

[0048] The preparation method of the polyimide fiber of embodiment two is as follows:

[0049] Synthesis of polyamic acid solution: According to the molar ratio of PMDA:ODA:DABA=10:7:3, first add ODA and DABA two diamine monomers into the metered solvent N-methylpyrrolidone to make the total solid content 12wt%, then stirred under the protection of nitrogen to dissolve all ODA and DABA, then added PMDA and stirred, and continued to react at 10°C for 15 hours in a nitrogen atmosphere to obtain a viscous polyamic acid homogeneous solution. Its intrinsic viscosity is 2.83dL / g.

[0050] The subsequent polyamic acid fiber spinning and polyamic acid fiber imidization processes are exactly the same as those in Example 1, so they are omitted here.

[0051] The structural formula of the polyimide fiber obtained in this embodiment is as shown in Example 1, n in the formula: m=7: 3, its tensile strength is 1.2GPa, initial modulus is 76.5GPa, and elongation at break is 6.2 %; Its glass ...

Embodiment 3

[0053] The preparation method of the polyimide fiber of the present embodiment is as follows:

[0054] The synthesis of polyamic acid solution: press PMDA: ODA: DABA=10: 5: 5 molar ratio, first add ODA and DABA two kinds of diamine monomers in the solvent N-methylpyrrolidone of metering, make its solid content be 10 wt%, then stir under nitrogen protection to dissolve all ODA and DABA, then add PMDA and stir, make it continue to react at 40°C for 24 hours in a nitrogen atmosphere to obtain a viscous polyamic acid homogeneous solution. Its intrinsic viscosity is 2.55dL / g.

[0055] The subsequent polyamic acid fiber spinning and polyamic acid fiber imidization processes are exactly the same as those in Example 1, so they are omitted here.

[0056] The structural formula of the polyimide fiber obtained in this embodiment is as shown in Example 1, n in the formula: m=5: 5, its tensile strength is 1.58GPa, initial modulus is 86.7GPa, and elongation at break is 5.8 %; Its glass tr...

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Abstract

The invention relates to a polyimide fiber containing an amido link structure and a preparation method thereof. The polyimide fiber containing an amido link structure comprises the raw materials such as aromatic diamine and aromatic dianhydride which contain amido link structures and have the molar ratio of 1:1. The preparation method thereof comprises the following steps of: adding the aromatic diamine and the aromatic dianhydride which contain amido link structures into a solvent according to the molar ratio of 1:1, carrying out polyreaction, spinning obtained polyamic acid spinning solution according to the conventional wet or dry-jet wet process and obtaining the fiber after imidizating the obtained polyamic acid protofilament by adopting a heat imidization process. The obtained polyimide fiber has obviously-enhanced mechanical strength while maintaining other performances. The preparation method has easy control and can keep the cost at a lower level.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of polyimide fibers, and in particular relates to a polyimide fiber containing an amide bond structure and a preparation method thereof. Background technique [0002] Compared with other high-performance fibers, polyimide fiber (PI) is expected to be used in the atomic energy industry, space and It is widely used in very harsh environments in the fields of environment, rescue needs, aerospace, national defense construction, new buildings, high-speed vehicles, marine development, sports equipment, new energy, environmental industries and protective equipment. [0003] The preparation method of existing polyimide fiber generally has one-step method and two-step method technology, and its technological process is as attached figure 1 shown. [0004] One-step method is to use polyimide solution to directly spin to prepare polyimide fiber. Such as Chinese invention patent ZL 02112048.X, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/74D01D5/06C08G73/10
Inventor 侯庆华戴玲陈丹红
Owner SINOSELEN HI TECH
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