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Polyimide nanofiber membrane as well as preparation method and application thereof

A nanofiber membrane and polyimide technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the problem of polyimide nanofiber membrane with large surface pore size and easy ion conduction. Through the diaphragm strength and other issues, to achieve the effect of reducing the diameter of nanofibers, good uniformity of film thickness, and uniform thickness

Inactive Publication Date: 2021-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the main technical problems to be solved by the present invention is that in the existing electrospinning technology, the surface pore size of the polyimide nanofiber membrane is large, the ions are easily conducted, and the strength of the diaphragm is low.

Method used

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  • Polyimide nanofiber membrane as well as preparation method and application thereof
  • Polyimide nanofiber membrane as well as preparation method and application thereof
  • Polyimide nanofiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Preparation of polyamic acid salt: Dissolve 4.05g of p-phenylenediamine (PDA) in 85g of N,N-dimethylacetamide (DMAc), at 25°C N 2 Stir under protection, after completely dissolving, add 10.95g of biphenyl tetraic acid dianhydride (BPDA), continue stirring for 1 hour after the addition, and obtain a polyamic acid (PAA) solution with a solid content of 15%. Add a certain amount of triethylamine to the PAA solution, the molar ratio of PAA and triethylamine is 1:2, and stir well for 2 hours to prepare a polyamic acid salt solution. The surface tension of the obtained solution is 28mN / m, and the apparent viscosity is 245Pa ·s.

[0043] 2. Preparation of spinning stock solution: slowly add the polyamic acid salt solution into 60 g of water, the surface tension of the mixed solution is 52 mN / m, and the apparent viscosity is 12 Pa·s.

[0044]3. Electrospinning: Using needleless electrospinning technology, add the above solution into the closed storage tank of the high-volta...

Embodiment 2

[0048] 1. Preparation of polyamic acid salt: Dissolve 2.70g of p-phenylenediamine (PDA) in 90g of N,N-dimethylacetamide (DMAc), at 25°C N 2 Stir under protection, and after complete dissolution, add 7.30 g of biphenyl tetraic acid dianhydride (BPDA), and continue stirring for 1 hour after the addition, to obtain a polyamic acid (PAA) solution with a solid content of 10%. Add a certain amount of triethylamine to the PAA solution, the molar ratio of PAA and triethylamine is 1:2, stir well for 2 hours to prepare a polyamic acid salt solution, the surface tension of the obtained solution is 22mN / m, and the apparent viscosity is 205Pa ·s.

[0049] 2. Preparation of spinning stock solution: slowly add the polyamic acid salt solution into 90 g of water, the surface tension of the mixed solution is 65 mN / m, and the apparent viscosity is 5 Pa·s.

[0050] The remaining steps are according to Example 1.

[0051] The obtained polyimide nanofibers had an average diameter of 6 nm, a diame...

Embodiment 3

[0053] 1. Preparation of polyamic acid salt: Dissolve 5.40g of p-phenylenediamine (PDA) in 80g of N,N-dimethylacetamide (DMAc), at 25°C N 2 Stir under protection, and after complete dissolution, add 14.60 g of biphenyl tetraic acid dianhydride (BPDA), and continue stirring for 1 hour after the addition, to obtain a polyamic acid (PAA) solution with a solid content of 20%. Add a certain amount of triethylamine to the PAA solution, the molar ratio of PAA and triethylamine is 1:2, stir well for 2 hours to prepare a polyamic acid salt solution, the surface tension of the obtained solution is 36mN / m, and the apparent viscosity is 280Pa ·s.

[0054] 2. Preparation of spinning stock solution: slowly add the polyamic acid salt solution into 40 g of water, the surface tension of the mixed solution is 41 mN / m, and the apparent viscosity is 20 Pa·s.

[0055] The remaining steps are according to Example 1.

[0056] The obtained polyimide nanofibers had an average diameter of 15 nm, a di...

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Abstract

The invention relates to a polyimide nanofiber membrane as well as a preparation method and application thereof. The problems of large surface aperture, easy ion conduction and low diaphragm strengthof the polyimide nanofiber membrane in the existing electrostatic spinning technology are solved. The preparation method of the polyimide nanofiber membrane comprises the following steps carrying outelectrostatic spinning on a polyamic acid salt solution to obtain a polyamic acid salt nanofiber membrane; and carrying out imidization on the polyamic acid salt nanofiber membrane to obtain the polyimide nanofiber membrane. The polyamic acid salt solution comprises a solvent and polyamic acid salt, the surface tension of the polyamic acid salt solution is 40-65 mN / m, and the apparent viscosity ofthe polyamic acid salt solution is 5-20 Pa.s, according to the technical scheme, the problems are better solved, and the method can be used for continuous production of polyimide nanofiber membranes.

Description

technical field [0001] The invention relates to a polyimide nanofiber membrane and its preparation method and application. Background technique [0002] As a high-performance engineering plastic, polyimide (PI) is widely used in aerospace, electrical insulation, atomic energy industry, In fields with harsh conditions such as national defense construction, environmental industry, protection industry, medical and health care, etc. [0003] Electrospinning technology is a simple and economical method to prepare fine fibers. The polyimide nanofibers prepared by electrospinning not only retain many excellent properties of polyimide materials, but also have a wide distribution of diameters, and the nanofiber membrane has a large specific surface area, many pores and small pore diameters, and has good properties. Filterability, adsorption, physical (heat, light, electromagnetic, etc.) properties and other advantages. Therefore, PI nanofiber membranes can be used in the field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4326D01F6/74C08G73/10
CPCD04H1/728D04H1/4326D01F6/74C08G73/1067
Inventor 陈雪张宏崔晶孙旭阳张培斌
Owner CHINA PETROLEUM & CHEM CORP
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