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Modified polybenzoxazole fiber and preparation method thereof

A benzobisoxazole and modified technology, applied in the field of material science, can solve problems such as uneven distribution and reduced mechanical properties of PBO, and achieve the effects of avoiding mutual slip, increasing adhesion, and improving interfacial shear strength.

Inactive Publication Date: 2009-02-04
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the above-mentioned technologies reduce the mechanical properties of PBO due to fiber damage or uneven distribution of modified components (such as carbon nanotubes) in PBO fibers.

Method used

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  • Modified polybenzoxazole fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] at P 2 o 5 In polyphosphoric acid (PPA) with a content of 83%, under nitrogen protection, add 4,6-diaminoresorcinol hydrochloride, terephthalic acid, 2,5-dihydroxyterephthalic acid under normal pressure stirring conditions Formic acid and 2,3,5,6-tetraaminopyridinium salt, the molar ratio of the four is controlled to be 1:1:0.15:0.05, the concentration of the monomer in the polyphosphoric acid solution is 6wt%; the temperature is controlled between 60~120°C remove hydrogen chloride, and then add P 2 o 5 , the P 2 o 5 The concentration was controlled to be 83wt%, reacted at 130°C for 3h, 150°C for 2h, and 180°C for 24h to obtain a PBO prepolymerization solution. Add the obtained PBO prepolymerization solution into a twin-screw extruder with a screw diameter of Φ25mm and an aspect ratio of 28. The processing technology is that the screw speed is 50 rpm, the temperature is 180°C, and the spinning speed is 100 m / min. After washing and drying Finally, PBO fibers are ob...

Embodiment 2

[0024] at P 2 o 5 Content is 83wt% in polyphosphoric acid (PPA), under nitrogen protection, change 4,6-diaminoresorcinol hydrochloride, terephthalic acid, 2,5-dihydroxyterephthalic acid under stirring condition The molar ratio of formic acid and 2,3,5,6-tetraaminopyridinium salt is 1:1:0.3:0.1, and the concentration of monomers in the polyphosphoric acid solution is 20wt%; kept at 120°C for 12h, after dehydrochlorination , adding P2O5, controlling the P2O5 concentration to 83wt%, reacting at 130°C for 3h, 150°C for 2h, and 180°C for 24h to obtain a PBO prepolymerization solution. Add the obtained PBO prepolymerization solution into a twin-screw extruder with a screw diameter of Φ25mm and an aspect ratio of 28. The processing technology is that the screw speed is 80 rpm, the temperature is 180°C, and the spinning speed is 130 m / min. After washing and drying Finally, PBO fibers are obtained.

[0025] According to GB / T 14337-93 method (test method for breaking strength and elo...

Embodiment 3

[0027]In the polyphosphoric acid (PPA) that P2O5 content is 83wt%, under nitrogen protection, change 4,6-diaminoresorcinol hydrochloride, terephthalic acid, 2,5-dihydroxy p- The molar ratio of phthalic acid and 2,3,5,6-tetraaminopyridinium salt is 1:1:0.45:0.15, and the concentration of monomer in the polyphosphoric acid solution is 16wt%; kept at 120°C for 12h, the After hydrogen chloride, add P2O5 concentration to 83wt%, react at 130°C for 3h, at 150°C for 2h, and at 180°C for 24h to obtain a PBO prepolymerization solution. Add the obtained PBO prepolymerization solution into a twin-screw extruder with a screw diameter of Φ25mm and an aspect ratio of 28. The processing technology is that the screw speed is 100 rpm, the temperature is 200°C, and the spinning speed is 160 m / min. After washing and drying Finally, PBO fibers are obtained.

[0028] According to GB / T 14337-93 method (test method for breaking strength and elongation at break of synthetic short fibers), the tensile...

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Abstract

The invention discloses modified PBO fiber and a preparation method thereof, which belongs to the field of material science. The preparation method of the modified PBO fiber comprises the following steps: under the protection of nitrogen and the condition of stirring at normal pressure, chemically calculated 4,6-DAR, TA and PPA are added in a prepolymer reactor, chlorine hydride is removed at 60 DEG C to 120 DEG C, P2O5 is supplemented after the chlorine hydride is fully removed, the concentration is controlled to be 82 weight percent to 84 weight percent, the reaction lasts for 3h at 130 DEG C, for 2h at 150 DEG C and for 24h at 180 DEG C, to obtain the PBO prepolymer solution; the obtained PBO prepolymer solution is added into a twin-screw extruder, to prepare the modified PBO fiber through a solution spinning process. The invention has the advantages that the introduction of hydrogen bonds between molecular chains in the fiber improves the mechanical property of the modified PBO fiber.

Description

technical field [0001] The invention relates to a modified polybenzobisoxazole fiber and a preparation method thereof, more specifically to a preparation method of a modified poly-p-phenylenebenzobisoxazole (PBO) fiber, and belongs to the field of material science. Background technique [0002] Benzobisoxazole polymers are a class of rigid polymers with benzobisoxazole groups in the main chain. The super conjugated rigid structure makes this kind of polymer have excellent thermal stability, mechanical properties and certain photoelectric properties. Among them, poly-p-phenylenebenzobisoxazole (referred to as PBO) is the most representative, and its structural formula is: [0003] [0004] PBO is a fully aromatic heterocyclic polymer with a perfect molecular structure. There are only two exocyclic single bonds at the phenyl group in the repeating structural unit, which cannot be rotated internally. The molecular chain is almost completely linear and rigid, so it can form ...

Claims

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Application Information

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IPC IPC(8): D01F6/78D01D5/06C08G73/22
Inventor 李从举
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY