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Micrometer/nanometer fiber composite filtering material and preparation method thereof

A nanofiber and composite filtration technology, applied in filtration separation, membrane filter, separation method, etc., can solve the problems of loss of filtration effect, easy damage, high resistance, etc., achieve increased specific surface area, simple production process, and ensure stable size Effect

Pending Publication Date: 2019-01-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The documents of application numbers 201610784058.9 and 201510004903.1 respectively use multi-layer spunbonded nonwovens to sandwich the nanofiber membrane in the middle layer to form a "sandwich" sandwich structure. This structure better protects the nanofiber membrane, but due to the formation of a dense nanofiber membrane , so the air permeability is poor, the resistance and cost are high when used in gas filtration, and the nanofiber membrane is easy to break and lose the filtering effect
The document with the application number 200980148171.6 provides a production method for directly compounding the nanofiber membrane on the surface of the nonwoven material. Although the dimensional stability of the nanometer membrane is improved, the prepared composite material has problems such as easy peeling, easy damage, and large pressure difference. Defects, it is difficult to apply to filtration conditions with high gas flow rates

Method used

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  • Micrometer/nanometer fiber composite filtering material and preparation method thereof
  • Micrometer/nanometer fiber composite filtering material and preparation method thereof
  • Micrometer/nanometer fiber composite filtering material and preparation method thereof

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preparation example Construction

[0034] The present invention simultaneously provides a kind of preparation method (abbreviation method) of micro / nano fiber composite filter material, it is characterized in that the method comprises the following steps:

[0035] Step 1, preparing a uniform electrospinning solution with a mass concentration of 5-40%;

[0036] The electrospinning solution includes all solutions capable of forming nanofibers through electrospinning technology, specifically polyester solutions, polyvinyl chloride solutions, polyvinyl alcohol solutions, polyetherimide solutions, polyamide solutions, polyethylene oxide At least one of solution, polystyrene solution, polyacrylonitrile solution, polylactic acid solution, polyamic acid solution, polytetrafluoroethylene solution or polysulfone solution;

[0037] Step 2, making the micron-scale fiber into a single-layer fluffy micron fiber net, and transporting it to the mesh conveyor curtain;

[0038] The micron-scale fiber forming method adopts dry-l...

Embodiment 1

[0048] Step 1. Dissolve 30 g of dry polyacrylonitrile (PAN) powder in 200 ml of N,N-dimethylformamide solvent to prepare an electrospinning solution with a mass concentration of 15%, and stir it magnetically for 12 hours at room temperature;

[0049] Step 2. The polyacrylonitrile fibers with a fiber length of 51 mm and a diameter of 13 μm are mixed, opened, and carded into a web with a grammage of 10 g / m 2 Single-layer fluffy micron fiber net, and conveyed to the mesh conveyor curtain;

[0050] Step 3, start spinning, use the electrospinning liquid obtained in step 1, set the single-hole injection volume to 3ml / h, and evenly spray single or bundled PAN from 6 rows of 36 needle-type electrospinning nozzles The single-layer fluffy microfibrous web that step 2 obtains on the conveying screen of nanofibers forms a grammage of 10.25g / m 2 A single-layer micro / nano fiber composite network;

[0051] The spinning temperature is 25°C, the relative humidity is 45%, the spinning voltage...

Embodiment 2

[0063] Step 1. Dissolve 30 g of dry thermoplastic polyurethane particles in 200 ml of N,N-dimethylformamide solvent to prepare an electrospinning solution with a mass concentration of 15%, and stir it magnetically for 10 hours at room temperature.

[0064] Step 2. Polyester fibers with a fiber length of 38 mm and a diameter of 10 μm are mixed, opened, and carded into a grammage of 5 g / m 2 Single-layer fluffy micron fiber web, and conveyed to the mesh conveyor curtain with mesh.

[0065] Step 3, start spinning, use the electrospinning liquid obtained in step 1, set the single-hole injection volume to 1.2ml / h, and evenly spray a single or bundle from 3 rows of 18 needle-free electrospinning nozzles Polyurethane nanofibers are transported to the single-layer fluffy micron fiber web on the mesh curtain that step 2 obtains, forming a grammage of 5.05g / m 2 A single-layer micro / nano fiber composite network;

[0066] The spinning temperature is 30°C, the relative humidity is 45%, th...

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Abstract

The invention discloses a micrometer / nanometer fiber composite filtering material and a preparation method thereof. The material comprises nanometer fiber and a single-layer micrometer fiber net; andthe structure is as follows: single or bunchy nanometer fiber is distributed on the surface of the single-layer micrometer fiber net uniformly or is embedded in a fiber assembly gap of the single-layer micrometer fiber net uniformly. The method comprises the following steps: preparing electrostatic spinning liquid; preparing the single-layer micrometer fiber net from micron-sized fiber and conveying the single-layer micrometer fiber net to a net conveying curtain with meshes; starting to perform electrostatic spinning by using the electrostatic spinning liquid, jetting single or bunchy nanometer fiber on the single-layer micrometer fiber net uniformly from an electrostatic spinning nozzle to form a single-layer micrometer / nanometer fiber composite net; and forming a continuous multi-layerstructure composite fiber net by using the single-layer micrometer / nanometer fiber composite net by a cross lapping mode, and performing mechanical consolidation to obtain the micrometer / nanometer fiber composite filtering material. The method is simple in production process, high in controllability and easy in industrialization.

Description

technical field [0001] The invention relates to the field of air filter materials, in particular to a micro / nano fiber composite filter material and a preparation method thereof. Background technique [0002] With the increasing air pollution, people's health and life have been seriously threatened. As a protective measure, the filter material can effectively purify atmospheric smoke and dust pollution. At present, textile filter materials are the most widely used in the field of industrial filtration in my country, which have excellent filtration effects on particles with a particle size of micron and above. However, the filtration effect on particles below submicron is not good, and it is difficult or impossible to meet Practical filtration needs, and there are disadvantages such as large filtration resistance, poor air permeability, short service life and small dust holding capacity. Therefore, it is imperative to develop high-efficiency and low-resistance filter material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14D04H1/72
CPCB01D39/14B01D2239/10D04H1/728
Inventor 钱晓明刘永胜钱幺邹驰邓辉
Owner TIANJIN POLYTECHNIC UNIV
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