Alkali-resistant polyimide fiber

A polyimide fiber, alkali-resistant technology, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve problems such as weak performance

Active Publication Date: 2014-04-09
JIANGSU XIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercialized P84 fibers and most polyimide fibers are weak in alkaline environment.

Method used

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  • Alkali-resistant polyimide fiber
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  • Alkali-resistant polyimide fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A: Using pyromellitic dianhydride and 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-5-aminobenzimidazole to synthesize polyamic acid (PAA) with a solid content of 10wt% Solution, the molar content of 2-(4-aminophenyl)-5-aminobenzimidazole in diamine is 5%. After filtering and vacuuming to remove air bubbles, the wet spinning process is used to spin and obtain alkali-resistant polyimide fiber;

[0029] B: The obtained alkali-resistant polyimide fiber and the commercialized P84 fiber were soaked in a 5wt% NaOH solution at room temperature for 10 hours, and then the two fibers were cleaned, dried, and the mechanical properties of the fibers were tested. The obtained The breaking strength retention rate of the fiber is as figure 2 shown. The surface SEM photos of alkali-resistant polyimide fiber and P84 fiber etched in 5wt% NaOH solution for 10 hours are as follows: image 3 shown.

[0030] C: The obtained alkali-resistant polyimide fiber and the commercialized P84 ...

Embodiment 2

[0035] A: Use pyromellitic dianhydride, 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-6-amino-4(3H)-quinazolinone to synthesize a solid content of 15wt % polyamic acid (PAA) solution, the molar content of 2-(4-aminophenyl)-6-amino-4(3H)-quinazolinone in diamine is 10%, filter and vacuumize to remove bubbles Finally, the wet spinning process is used to spin and obtain alkali-resistant polyimide fibers;

[0036] B: The obtained alkali-resistant polyimide fiber and the commercialized P84 fiber were soaked in a 5wt% NaOH solution at room temperature for 10 hours, and then the two fibers were cleaned, dried, and the mechanical properties of the fibers were tested. The obtained Fiber breaking strength retention.

[0037] C: The obtained alkali-resistant polyimide fiber and the commercialized P84 fiber add 20wt% H at room temperature 2 SO 4 After soaking in the solution for 120 hours, the two kinds of fibers were washed, dried, and the mechanical properties of the fibers were t...

Embodiment 3

[0042] A: Using 3,3',4,4'-diphenylmethyl ether tetra-acid dianhydride (ODPA) and 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-5-aminobenzene And imidazole and 2-(4-aminophenyl)-6-amino-4(3H)-quinazolone synthetic solid content is the polyamic acid (PAA) solution of 20wt%, 2-(4-aminophenyl )-5-aminobenzimidazole and 2-(4-aminophenyl)-6-amino-4(3H)-quinazolinone have a molar content of 8% in diamine respectively, filter and vacuum to remove bubbles Finally, the dry spinning process is used to spin and obtain alkali-resistant polyimide fibers;

[0043] B: The obtained alkali-resistant polyimide fiber and the commercialized P84 fiber were soaked in a 5wt% NaOH solution at room temperature for 10 hours, and then the two fibers were cleaned, dried, and the mechanical properties of the fibers were tested. The obtained Fiber breaking strength retention.

[0044] C: The obtained alkali-resistant polyimide fiber and the commercialized P84 fiber add 20wt% H at room temperature 2 S...

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Abstract

An alkali-resistant polyimide fiber is disclosed, and is prepared mainly as follows: adding one or two of two monomers of 2-(4-amino phenyl)-5-amino benzimidazole or 2-(4-amino benzene)-6-amino-4(3 H)-quinazolinone for copolymerization with other aromatic diamine and aromatic dianhydride for synthesis. Compared with P84 series polyimide fibers commonly used in a market, the environment-resistant performances of the alkali-resistant polyimide fiber in acidic environment influences, alkaline environment influences, organic solvent environment influences, uv (ultraviolet) irradiation influences and other aspects (especially the alkali-resistant performance) are greatly improved. The alkali-resistant polyimide fiber has the characteristics of high preparation efficiency, low raw material cost, low energy consumption and the like, and can be used for large-scale industrial production and replacement of the P84 series polyimide fibers.

Description

technical field [0001] The invention relates to an alkali-resistant polyimide fiber, which is mainly made by adding 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) or 2-(4-aminophenyl)-6- Amino-4(3H)-quinazolinone (AAQ) is a polyimide fiber prepared by copolymerization of any one or two of these two monomers with other aromatic diamines and aromatic dianhydrides. Compared with the P84 series polyimide fibers commonly used in the market, the fiber has greatly improved environmental resistance in terms of acidic environment influence, alkaline environment influence, organic solvent environment influence, ultraviolet radiation influence, etc., especially alkali resistance performance. The invention belongs to the technical field of polyimide fiber application. Background technique [0002] As a representative of high-performance fibers, polyimide (PI) fibers not only have the characteristics of high strength and high modulus, but also have multiple characteristics such as high an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78C08G73/10
Inventor 俞建刚
Owner JIANGSU XIANNUO NEW MATERIAL TECH
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