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Ultra-short electrospinning polyimide nanofiber and preparing method thereof

A technology of ultra-short polyimide and polyimide fibers, applied in the direction of single-component polyamide rayon, fiber processing, fiber chemical characteristics, etc., can solve the problem of poor length uniformity, insufficient diameter, and small fiber surface area and other problems, to achieve the effect of high degree of orientation, uniform ultra-short length and good dispersion.

Active Publication Date: 2019-08-09
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, electrospun polyimide nano-short fibers are all obtained by crushing non-oriented electrospun polyimide nanofiber mats or porous membranes, and their length uniformity is very poor, and the length difference is too large. The adhesion between fibers makes it difficult to disperse in any dispersant or resin, which seriously affects the mechanical properties of composite materials prepared with it, such as stress defects, stress concentration, and internal microcracks; On the other hand, the diameter of the current conventional short polyimide fibers is not fine enough, generally greater than 10.0 μm, the surface area of ​​the fibers is small, the interface interaction with the matrix resin in the composite material is weak, and the effect of strengthening and toughening is not significant

Method used

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  • Ultra-short electrospinning polyimide nanofiber and preparing method thereof
  • Ultra-short electrospinning polyimide nanofiber and preparing method thereof
  • Ultra-short electrospinning polyimide nanofiber and preparing method thereof

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preparation example Construction

[0024] In order to solve the above technical problems, the present invention provides a preparation method of ultra-short electrospun polyimide nanofibers. The preparation process includes:

[0025] (1) Preparation of polyamic acid solution;

[0026] (2) Electrospinning to form polyamic acid fiber felt;

[0027] (3) Cut the polyamic acid fiber felt into strips;

[0028] (4) Thermal drawing to form polyimide fiber;

[0029] (5) Cut to form ultra-short polyimide nanofibers.

[0030] In one embodiment, the raw materials prepared in the preparation process of the polyamic acid solution include tetraacid dianhydride monomer, diamine monomer, and polar solvent.

[0031] In one embodiment, the tetraacid dianhydride monomer is Where R 1 It is any one or a combination of the following groups:

[0032]

[0033]

[0034] Preferably, R 1 for

[0035] In one embodiment, the diamine monomer is H 2 N-R 2 -NH 2 , Where R 2 It is any one or a combination of the following groups:

[0036]

[0037] Preferabl...

Embodiment 1

[0060] Embodiment 1 of the present invention provides an ultrashort electrospun polyimide nanofiber, the preparation process of which includes:

[0061] (1) Preparation of polyamic acid solution;

[0062] (2) Electrospinning to form polyamic acid fiber felt;

[0063] (3) Cut the polyamic acid fiber felt into strips;

[0064] (4) Thermal drawing to form polyimide fiber;

[0065] (5) Cut to form ultra-short polyimide nanofibers;

[0066] The raw materials used in the preparation of the polyamic acid solution include tetraacid dianhydride monomer, diamine monomer and polar solvent. The molar ratio of tetraacid dianhydride monomer to diamine monomer is 1:1; tetraacid dianhydride The weight ratio of the total weight of the monomer and the diamine monomer to the polar solvent is 22:100;

[0067] Tetraacid dianhydride monomer is R 1 for

[0068] Diamine monomer is H 2 N-R 2 -NH 2 , R 2 for

[0069] The polar solvent is N,N-dimethylacetamide;

[0070] The preparation method of the polyamic acid ...

Embodiment 2

[0076] Embodiment 2 of the present invention provides an ultrashort electrospun polyimide nanofiber, the preparation process of which includes:

[0077] (1) Preparation of polyamic acid solution;

[0078] (2) Electrospinning to form polyamic acid fiber felt;

[0079] (3) Cut the polyamic acid fiber felt into strips;

[0080] (4) Thermal drawing to form polyimide fiber;

[0081] (5) Cut to form ultra-short polyimide nanofibers;

[0082] The raw materials used in the preparation process of the polyamic acid solution include tetraacid dianhydride monomer, diamine monomer and polar solvent. The molar ratio of tetraacid dianhydride monomer to diamine monomer is 1.2:1; tetraacid dianhydride The weight ratio of the total weight of the monomer and the diamine monomer to the polar solvent is 25:100;

[0083] Tetraacid dianhydride monomer is R 1 for

[0084] Diamine monomer is H 2 N-R 2 -NH 2 , R 2 for

[0085] The polar solvent is N,N-dimethylacetamide;

[0086] The preparation method of the poly...

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Abstract

The invention relates to the technical field of ultra-short fiber, in particular to an ultra-short electrospinning polyimide nanofiber and a preparing method thereof. The preparing method of the ultra-short electrospinning polyimide nanofiber includes the steps of preparing a polyamide acid solution, conducting electrostatic spinning to form polyamide acid fiber felt, slitting the polyamide acid fiber felt into strips, conducting heat drawing to form high-orientation polyimide nanofiber bundles, and conducting cutting to form the ultra-short electrospinning polyimide nanofiber, wherein the width of the strips obtained by slitting the polyamide acid fiber felt is 3-8 cm, and the length of the ultra-short electrospinning polyimide nanofiber obtained through cutting is 0.1-2.00 mm. The ultra-short nanofiber even in length distribution can be prepared, and the nanofiber is quite high in dispersity and has potential applicability for preparing carbon fiber composites and flexible honeycombmaterials.

Description

Technical field [0001] The present invention relates to the technical field of ultra-short fibers. More specifically, the present invention relates to an ultra-short electrospun polyimide nanofiber and a preparation method thereof. Background technique [0002] Polyimide fiber is an organic fiber that is currently used at a higher temperature. Compared with other high-performance fibers (such as aramid fiber and polyphenylene sulfide fiber), it has the advantages of heat resistance, aging resistance, oxidation resistance, UV resistance, and water absorption. It is more superior in other aspects. Therefore, polyimide fiber is widely used in environmental protection, aerospace, special and high-temperature insulation, civil textiles and other fields. Ultra-short polyimide fiber not only has the excellent properties of polyimide fiber, but more importantly, it is made into slurry coating liquid, or used as a filler for resin, rubber, etc., or as a special pulp The use of materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D06H7/00D06C3/00D01F6/74C08G73/10
CPCD04H1/728D06H7/00D06C3/00D01F6/74C08G73/1071D01F6/60D01D5/0038D01D10/02D04H1/4326
Inventor 侯豪情欧阳文程楚云王琦吕晓义
Owner JIANGXI XIAN CAI NANOFIBERS TECH
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