Polyimide nanofiber flocculus, preparation method and application thereof

A nanofiber and polyimide technology, which is applied in the field of air filtration and purification, can solve the problems of poor durability, weak electrospinning layer strength, easy peeling or damage, etc., and achieve high filtration efficiency and good air permeability , the effect of huge application prospects

Inactive Publication Date: 2015-11-04
JIANGXI ADVANCED NANOFIBER S&T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, research on electrospun nanofiber air filter materials mainly focuses on traditional filter media as the base cloth, and directly deposits nanofibers on the base cloth to form a composite filter material. The strength of the electrospun layer in the composite filter material is too weak. , easy to peel or break, poor durability

Method used

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  • Polyimide nanofiber flocculus, preparation method and application thereof
  • Polyimide nanofiber flocculus, preparation method and application thereof
  • Polyimide nanofiber flocculus, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: Preparation of pyromphthalic anhydride / diphenyl ether diamine / dimethyl benzidine diamine (PMDA / ODA / DMB) copolymerized polyimide nanofiber flakes

[0050] Preparation steps (1) Synthesis and electrospinning of spinning solution: take a certain amount of perphthalic anhydride (PMDA), diphenyl ether diamine (ODA) and dimethyl benzidine diamine in a molar ratio of 1:0.7:0.3 (DMB) and N,N-dimethylacetamide (DMAC), stirred in a polymerization reactor at 10°C for about 8 hours to obtain a polyamic acid solution, and added tetrahydrofuran to adjust the solid content of the solution to obtain a mass concentration of 18%. , tetrahydrofuran accounted for 45% of the total solvent content, absolute viscosity of 1.5Pa.s polyamic acid spinning solution. The polyamic acid spinning solution was electrospun in an electric field with an electric field strength of 30KV / m, and the nanofiber flakes were collected by a negatively charged, 1m wide, and 0.7m diameter seamless stai...

Embodiment 2

[0053] Embodiment 2: the preparation of pyrophthalic anhydride / biphenyl dianhydride / benzophenone dianhydride / diphenyl ether diamine (PMDA / BPDA / BTDA / ODA) copolymerized polyimide nanofiber flakes

[0054] Preparation steps (1) Synthesis and electrospinning of spinning solution: take a certain amount of pyrphthalic dianhydride (PMDA), biphenyl dianhydride (BPDA), benzophenone dianhydride ( BTDA), diphenyl ether diamine (ODA) and N,N-dimethylacetamide (DMAC), stirred in a polymerization reactor at 10°C for about 8 hours to obtain a polyamic acid solution, and added tetrahydrofuran to adjust the solidification of the solution. content, to obtain a polyamic acid spinning solution with a mass concentration of 20%, tetrahydrofuran accounting for 46% of the total solvent content, and an absolute viscosity of 1.8 Pa.s. The polyamic acid spinning solution was electrospun in an electric field with an electric field strength of 40KV / m, and the nanofiber flakes were collected by a negativel...

Embodiment 3

[0057] Embodiment 3: Physophthalic anhydride / triphenylene ether dianhydride / diphenoxybenzophenone diamine / diphenyl ether diamine (PMDA / HQDPA / BABP / ODA) copolymerized polyimide nanofiber flakes preparation of

[0058] Preparation steps (1) Synthesis and electrospinning of spinning solution: Take a certain amount of pyrphthalic anhydride (PMDA), triphenylene dianhydride (HQDPA), diphenoxy Benzophenone diamine (BABP), diphenyl ether diamine (ODA) and N,N-dimethylacetamide (DMAC), stirred in a polymerization reactor at 10°C for about 8 hours to obtain a polyamic acid solution , adding tetrahydrofuran to adjust the solid content of the solution to obtain a polyamic acid spinning solution with a mass concentration of 20%, tetrahydrofuran accounting for 50% of the total solvent content, and an absolute viscosity of 2.0 Pa.s. The polyamic acid spinning solution was electrospun in an electric field with an electric field strength of 50KV / m, and the nanofiber flakes were collected by a ...

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Abstract

The invention provides a polyimide nanofiber flocculus, a preparation method and application thereof. The structure of the polyimide nanofiber flocculus is described in the following formula (1). In the formula (1), R1 denotes dianhydride residues of aromatic-containing rings. R2 denotes diamine residues of romatic-containing rings. N is an integer larger than 100. The polyimide nanofiber flocculus provided by the invention is featured by being high in filtration efficiency, good in air permeability, permanent in flame retardance and endurable in high temperature and is less susceptible to deformation and has anti-bacteria, mould-proof and electrostatic adsorption functions and has an extensive application prospect in air filtrations fields such as high-temperature filtration, high-end filtration and sterile filtration.

Description

technical field [0001] The invention belongs to the application field of air filtration and purification, and relates to an air filter material and a preparation method thereof, in particular to a polyimide nanofiber flake material, a preparation method and an application thereof. Background technique [0002] With the development of modern industry, the requirements for the air purification system of the equipment are getting higher and higher. In order to achieve a high level of air cleanliness, the performance requirements for the filter materials used are also getting higher and higher. [0003] The electrospinning method can obtain nanofibers with a diameter of more than a dozen to submicron levels, and the fibers have the characteristics of large specific surface area and high porosity. At present, research on electrospun nanofiber air filter materials mainly focuses on traditional filter media as the base cloth, and directly deposits nanofibers on the base cloth to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4334D06C7/00C08G73/10B01D39/04
Inventor 欧阳文侯豪情王琦程楚云周小平
Owner JIANGXI ADVANCED NANOFIBER S&T CO LTD
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