Preparation method of multilayer-structure nano fiber composite membrane for filtering particulates in air

A nanofiber membrane and nanofiber technology, which is applied in the direction of dispersed particle filtration, fiber treatment, separation methods, etc., can solve the problems of reducing filtration performance, affecting the filtration efficiency of particle filtration membranes, and reducing filtration efficiency, so as to reduce filtration air resistance, High particle filtration efficiency, effect of improving blocking efficiency

Inactive Publication Date: 2017-03-29
东莞巨微新材料科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some insurmountable difficulties for nanofibrous membranes in current commercial applications
For example: (1) Inhomogeneity
The uneven distribution on the surface of the collection screen is a major obstacle affecting its use as an air filter material, because the thinner part of the fiber membrane has low air resistance, and the airflow tends to pass through the thinner part, reducing the filtration efficiency, and the nanofiber membrane If there are large pores in the middle and thin parts, the particles will pass through directly and the filtration performance will be reduced
(2) poor mechanical strength
The electrospun nanofiber filter membrane is very light and thin, with poor mechanical properties, especially after reaching a certain thickness, the cohesion between the fiber layers becomes poor, and the fiber layers are easy to separate
Especially in the filtration process, due to the influence of air pressure, the fiber membrane may break or the gap between the fibers may increase, which will affect the filtration efficiency of the particulate filter membrane and reduce the life of the filter membrane.

Method used

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  • Preparation method of multilayer-structure nano fiber composite membrane for filtering particulates in air
  • Preparation method of multilayer-structure nano fiber composite membrane for filtering particulates in air
  • Preparation method of multilayer-structure nano fiber composite membrane for filtering particulates in air

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Embodiment 1

[0035] A preparation method for a multi-layer structure nanofiber composite membrane used for filtering particulate matter in the air, comprising the following steps:

[0036] (1) In PP nonwoven fabric (weight is 30g / m 2 ) substrate is spun into the first nanofiber film layer——PAN nanofibers by electrospinning. The receiving device used in electrospinning is a drum-type receiving device. The drum speed is 30r / min and the voltage is 18KV. The distance from the nozzle to the receiving template is 12cm, the ambient temperature is 26°C, and the relative humidity is 40%;

[0037] (2) The upper surface of the first nanofiber film layer and the exposed surface of each nanofiber film layer are covered with PP filament nonwoven fabric by electrospinning to obtain semi-finished product I, and the nanofiber film protective layer Surface density is 20g / m 2 ;

[0038] (3) The semi-finished product I is impregnated, loaded with 5% granular activated carbon, the impregnation time is 10min...

Embodiment 2

[0043] A preparation method for a multi-layer structure nanofiber composite membrane used for filtering particulate matter in the air, comprising the following steps:

[0044] (1) The first nanofiber film layer and the second nanofiber film layer are sequentially spun into the woven fabric by electrospinning. The receiving device used in electrospinning is a drum receiving device, and the drum speed is 35r / min. , the voltage is 42KV, the distance from the needle to the receiving template is 11.2cm, the ambient temperature is 37°C, and the ambient relative humidity is 25%;

[0045] (2) The first nanofiber film layer is obtained by mixing PES with 3% TiO 2 Nano particle additives are prepared by electrospinning. Among them, TiO 2 The average diameter of the nanoparticles is 25 nm. The average fiber diameter is 350 nm. The second nanofibrous membrane layer is made of PVDF with 3% TiO 2 Nano particle additives are prepared by electrospinning. Among them, TiO 2 The average d...

Embodiment 3

[0051] A preparation method for a multi-layer structure nanofiber composite membrane used for filtering particulate matter in the air, comprising the following steps:

[0052] (1) at 20g / m 2 The PP filament non-woven fabric is spun into the first nanofiber film layer and the second nanofiber film layer sequentially by electrospinning. The receiving device used in electrospinning is a drum type receiving device, and the drum speed is 40r / min. , the voltage is 44KV, the distance from the needle to the receiving template is 11.5cm, the ambient temperature is 37°C, and the ambient relative humidity is 30%;

[0053] (3) The fabrication process of the first nanofiber film layer is prepared by electrospinning PVDF and 20% ZnO nanoparticle precursor additives, and subjecting the nanofiber film to 120° heat treatment. Wherein, the average diameter of the ZnO nanoparticles in the PVDF fiber is 20nm, and the average diameter of the fiber is 1.5um. The second nanofiber film layer is pre...

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Abstract

The invention relates to the technical field of manufacturing of fiber composite membranes, particularly a preparation method of a multilayer-structure nano fiber composite membrane for filtering particulates in air. The preparation method comprises the following steps: (1) sequentially spinning a first nano fiber membrane layer to nth nano fiber membrane layer onto a matrix by electrostatic spinning, wherein n is a whole number ranging from 1 to 50; (2) covering a nano fiber membrane protective layer on the upper surface of the nth nano fiber membrane layer and the exposed surfaces of all the nano fiber membrane layers to obtain a semifinished product; and (3) compounding the semifinished product to obtain the product. The method can enhance the uniformity and mechanical properties of the filter membrane, and can also enhance the barrier efficiency of the filter membrane for particulates and relatively lower the air drag.

Description

technical field [0001] The invention relates to the technical field of fiber composite membrane manufacturing, in particular to a method for preparing a multi-layer structure nanofiber composite membrane used for filtering particulate matter in the air. Background technique [0002] With the increasingly serious environmental pollution and the strengthening of people's environmental awareness, air quality has become the focus of global attention. People realize that air filtration should not only protect mechanical equipment but also protect people. Therefore, the application range of air filtration is more and more extensive. The largest application for air filtration is residential buildings, followed by commercial and industrial buildings. In addition, filter equipment is also commonly used in the following occasions: clean room, copying equipment, indoor air purifier, air conditioner, etc. Among them, the demand for residential areas is increasing due to the continuous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/15B32B37/06B32B37/10B32B27/02B32B27/12B32B27/20B32B33/00D01D5/00B01D46/54
CPCB32B37/15B01D46/543B01D46/546B32B5/02B32B5/26B32B27/12B32B27/20B32B33/00B32B37/06B32B37/10B32B2250/20B32B2262/02D01D5/0076
Inventor 陈柔羲程建华齐亮郑华生张鹏谢培镇
Owner 东莞巨微新材料科技有限公司
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