Polyimide/polyacrylonitrile blended fiber and preparation method thereof

A technology of blending fiber and polyacrylonitrile, which is applied in the direction of wet spinning, conjugated synthetic polymer rayon, heat treatment of rayon, etc., can solve the problems not involved in the blending of polyimide fiber materials, and achieve High heat resistance, expanded application field, and improved fracture strength

Active Publication Date: 2012-08-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies on polyimide blended fibers are also limited to the use of finished polyimide materials for blending modi

Method used

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  • Polyimide/polyacrylonitrile blended fiber and preparation method thereof
  • Polyimide/polyacrylonitrile blended fiber and preparation method thereof
  • Polyimide/polyacrylonitrile blended fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0038] Example 1:

[0039] Synthesis and blending of spinning solution: in a three-necked bottle, put. 4.4888g p-phenylenediamine (p-PDA) was dissolved in 61mL dimethyl sulfoxide (DMSO), and 12.2740g 3,3',4,4'-biphthalic dianhydride (BPDA) was added in batches, and the cumulative The feeding time is 0.5h, and stirring is continued for 4-5h at 20-25℃, until the apparent viscosity of the PAA solution increases and remains stable; 5.5g PAN is dissolved in 20mL DMSO, and N at 20-25℃ 2 protection, continue stirring for 2-3h until the powder is completely dissolved; N 2 Under the protection conditions, take 2 mL of PAN solution and add it to the PAA system, the mass fraction of PAN in the PAA / PAN blending component (excluding the solvent) is 3%, while mechanical stirring, the temperature of the blending process is controlled within the range of 40-60 ° C , the blending and stirring time is 30-60min, until the mixing is uniform, so as to obtain the spinning solution blending precur...

Example Embodiment

[0042] Example 2:

[0043] Synthesis and blending of spinning solution: in a three-necked flask, dissolve 11.2221gp-PDA in 100mL DMSO, add 30.8376g BPDA in batches, the cumulative feeding time is 1h, and finally add 52mL DMSO, under the condition of 20-25℃ Continue to stir for 5-6h until the apparent viscosity of the PAA solution increases and remains stable; dissolve 5.5g PAN in 20mL DMSO, under the condition of 20-25℃, N 2 protection, continue stirring for 2-3h until the powder is completely dissolved; N 2 The PAN solution was added to the PAA system under protective conditions, and the mass fraction of the PAA / PAN blending components (excluding the solvent) occupied by PAN was 12%. The mixing time is 30-60min, until the mixing is uniform, so as to obtain the spinning solution blending precursor II;

[0044] Preparation of polyamic acid / polyacrylonitrile spun fiber blend: the spinning solution blend precursor II is subjected to defoaming treatment, and the spun fiber is pr...

Example Embodiment

[0046] Example 3:

[0047] Synthesis and blending of spinning solution: in a three-necked bottle, dissolve 5.6110g p-PDA in 50mL DMSO, add 15.4187g BPDA in batches, the cumulative feeding time is 30min, and finally add 26mL DMSO at 20-25°C Continue stirring for 4-5h under the condition of PAA solution, until the apparent viscosity of the PAA solution increases and remains stable; 5.5g PAN is dissolved in 20mL DMSO, under the condition of 20-25℃, N 2 protection, continue stirring for 2-3h until the powder is completely dissolved; N 2 The PAN solution was added to the PAA system under protective conditions, and the mass fraction of the PAA / PAN blending components (excluding the solvent) occupied by PAN was 21%. The mixing time is 30-60min, until the mixing is uniform, so as to obtain the spinning solution blending precursor III;

[0048] Polyamic acid / polyacrylonitrile primary blend fiber preparation: the spinning solution blend precursor III is subjected to defoaming treatmen...

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Abstract

A polyimide/polyacrylonitrile blended fiber and a preparation method belong to the technical field of blended fibers. The preparation method includes respectively preparing PAA (poly acrylic acid) liquor and PAN (polyacrylonitrile) liquor; blending the PAN liquor with the mass ranging from 3% to 40% of that of total PAA/PAN blended components and the PAA liquor to obtain spinning liquid precursor; removing bubbles in a vacuum manner, realizing wet-method spinning to obtain a PAA/PAN as-formed blended fiber; and realizing heat treatment for the as-formed blended fiber, removing moisture and solvent, completing a pre-oxidation process for the PAN component in the blended fiber and an imide cyclization process for the poly acrylic acid in the blended fiber, and obtaining the PI (polyimide)/PAN fiber. By means of comparing performances of a single component and the blended fiber under identical treatment conditions, a blended system capable of keeping an excellent mechanical performance of the fiber is obtained, and an excellent economic benefit is realized as compared with a PI fiber.

Description

technical field [0001] The invention relates to a blended fiber of polyimide (PI) and polyacrylonitrile (PAN) and a preparation method thereof, belonging to the technical field of blended fibers. Background technique [0002] Polyimide (PI) fiber is one of the varieties of high-performance fibers. Because of its unique molecular chain structure and conjugation effect, the fiber exhibits many excellent properties, such as thermal stability, low temperature resistance, radiation resistance Illumination, dielectric properties, flame retardancy, etc. In addition, as a fiber material, PI fiber also has high-strength and high-modulus properties, especially in terms of modulus. [0003] In terms of preparation methods, wet method and dry-wet spinning can be used to prepare polyimide fibers. According to whether the spinning slurry is polyimide or polyamic acid, the preparation method of polyimide fiber can be divided into one-step method and two-step method. In one-step method, ...

Claims

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Application Information

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IPC IPC(8): D01F8/08D01F8/16C08G73/10D01D5/06D01D10/02
Inventor 武德珍赵昕齐胜利牛鸿庆韩恩林汪晓东
Owner BEIJING UNIV OF CHEM TECH
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