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Preparation method of micro/nano fiber aerogel composite filter material

A technology of nanofiber and composite filter material, which is applied in the field of textile materials, can solve the problems such as the need to improve the particle filtration efficiency, achieve the effects of improving filtration efficiency, protecting the environment, and solving secondary pollution

Active Publication Date: 2020-04-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after ultrasonic impregnation, nanofibers are mainly randomly distributed on the upper and lower surfaces of the substrate, and only some fibers are embedded in the substrate, and the filtration efficiency of particles below 0.5 μm needs to be improved

Method used

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  • Preparation method of micro/nano fiber aerogel composite filter material
  • Preparation method of micro/nano fiber aerogel composite filter material
  • Preparation method of micro/nano fiber aerogel composite filter material

Examples

Experimental program
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specific Embodiment approach

[0051] The preparation process of nano / micro fiber composite airgel filter material is as follows: figure 1 Shown: the preparation of the micro / nano high-temperature resistant fiber membrane, the preparation of the fiber dispersion, the freeze-drying of the substrate impregnated with the dispersion, and the reinforcement of the airgel composite filter material in sequence. The specific implementation is as follows:

[0052] A kind of micro / nano fiber airgel composite filter material, comprises following raw material:

[0053] P84 fiber; soluble polyimide (PI) powder; polyphenylene sulfide (PPS) needle-punched nonwoven substrate, 500g / m 2 ; N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), dioxane.

[0054] (1) Preparation of micro / nano fibers:

[0055] Using multi-needle electrospinning technology, the PI spinning solution with a concentration of 16% and the PI spinning solution with a concentration of 25% are spun side by side, and the number ratio of 16% PI / 25% P...

Embodiment 2

[0063] A kind of micro / nano fiber airgel composite filter material, comprises following raw material:

[0064] P84 fiber; soluble polyimide (PI) powder; polyphenylene sulfide (PPS) needle-punched nonwoven substrate, 500g / m 2 ; N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), dioxane.

[0065] (1) Preparation of micro / nano fibers:

[0066] Using multi-needle electrospinning technology, the PI spinning solution with a concentration of 10% and the PI spinning solution with a concentration of 25% are spun side by side, and the ratio of the number of 10% PI / 25% PI nozzles is 3:1. Among them, the PI spinning solution with a concentration of 10% is made of P84 fiber, and DMF is used as a spinning solution; the PI spinning solution with a concentration of 25% is made of soluble polyimide (PI) powder. Oxane:DMF=1:1 is the spinning solution. During the spinning process, the spinning voltage was 20 kV, the spinning distance was 20 cm, and the spinning flow rate was 1 mL / h. ...

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Abstract

The invention discloses a preparation method of a micro / nano fiber aerogel composite filter material, and belongs to the field of textile materials. The specific preparation method comprises the following steps: (1) preparing micro / nano fibers; (2) shearing and crushing the micro / nano fibers prepared in the step (1) to prepare a dispersion liquid; (3) impregnating a base material in the fiber dispersion liquid obtained in the step (2), carrying out freeze-drying molding, carrying out suction filtration on the base material and the fiber dispersion liquid by adopting a vacuum suction filtrationmethod to obtain a wet-state composite material, and performing freeze drying on the wet composite material to prepare an aerogel material; and (4) reinforcing the aerogel composite filter material obtained in the step (3) to obtain the micro / nano fiber aerogel composite filter material. According to the invention, the micro / nano fiber aerogel composite filter material with the continuous gradient structure is prepared by adopting a vacuum filtration method, is high in filtration efficiency, and is suitable for the fields of high-temperature flue gas filtration, oil / water, heat insulation, sound absorption, fiber reinforced composite materials and the like.

Description

technical field [0001] The invention relates to a preparation method of a micro / nano fiber airgel composite filter material, which belongs to the field of textile materials. Background technique [0002] The emission of industrial smoke and dust is one of the main causes of smog, especially the resulting fine particulate matter (PM2.5), which will increase the incidence of human respiratory diseases. Therefore, research and development of high-temperature flue gas filter materials that control dusty flue gas emissions in industrial furnaces and kilns and solve their key technologies are the research focus and hotspots in the field of environmental protection in my country. However, high-temperature flue gas filtration has higher requirements on the collection efficiency and service life of the filter material. Currently, needle-punched, spunlace or film-coated filter materials are mostly used. [0003] For example, Chinese patent CN105220364A discloses a non-woven material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16D01D5/00D01G1/04
CPCB01D39/1623B01D2239/10D01D5/0007D01D5/0023D01G1/04
Inventor 邓炳耀李大伟申莹刘庆生刘慧中
Owner JIANGNAN UNIV
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