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Composite filtering material and preparation method thereof

A composite filtration and filtration layer technology, applied in filtration and separation, membrane filters, separation methods, etc., can solve problems such as unfavorable centrifugal spinning industrialization, discontinuous fiber filaments, etc., to improve the chance of collision and adhesion, increase the The effect of large specific surface area and nanopore volume, reducing resistance pressure drop

Active Publication Date: 2020-01-21
JIANGSU YIMAO FILTER MEDIA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the fibers prepared by centrifugal spinning are mainly collected in the form of circular collection at home and abroad, but this collection method is not conducive to the industrialization of centrifugal spinning, and the obtained fibers are discontinuous short filaments

Method used

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  • Composite filtering material and preparation method thereof
  • Composite filtering material and preparation method thereof
  • Composite filtering material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] see Figure 4-6 As shown, the invention provides a kind of preparation method of composite filter material, comprises the steps:

[0047] S1. Prepare a first polymer spinning solution with a predetermined concentration, pour it into a plane receiving centrifugal spinning device, and perform centrifugal spinning, and collect it in a collecting device to obtain a primary filter layer of non-woven fabric;

[0048] S2. Prepare a mixed organic solvent of dichloromethane / N,N-dimethylacetamide in a predetermined mass ratio, and then add titanium dioxide nanoparticles and second polymer particles respectively for stirring and ultrasonic treatment to obtain a polymer / titanium dioxide / organic solvent mixed spinning silk liquid; finally, the electrospinning process is used to prepare porous structure micro-nano fibers, which are collected and deposited on the surface of the non-woven primary filter layer to obtain the porous micro-nano fiber medium-effect filter layer;

[0049] S...

Embodiment 1

[0054] A preparation method of a composite filter material, comprising the steps of:

[0055] S1. Dissolve polyimide polymer particles in N,N-dimethylacetamide, prepare a polyimide spinning solution with a mass fraction of 25 wt%, inject it into a plane receiving centrifugal spinning device, and perform centrifugal spinning Silk, collected by the collection device to obtain the primary filter layer of non-woven fabric; wherein, during the centrifugal spinning process, the spinneret aperture is 0.41mm, the collection distance is 10cm, the spinning temperature is 80°C, and the spinning speed is 8000r / min.

[0056] S2. Prepare a mixed organic solvent of dichloromethane / N,N-dimethylacetamide (DCM / DMAC) with a mass ratio of 10:1, add titanium dioxide particles, stir thoroughly at room temperature with a constant temperature magnetic stirrer, and then perform ultrasonic treatment ; Then add polystyrene particles, fully stir until completely dissolved, and then ultrasonically treat, ...

Embodiment 2-10

[0063] The difference from Example 1 is: the mass fraction of polystyrene and titanium dioxide, the mass ratio of dichloromethane / N,N-dimethylacetamide (DCM / DMAC) and the difference in relative humidity, other steps are basically the same, I won't repeat them here.

[0064] Table 1 is the setting of the mass fraction of polystyrene and titanium dioxide, methylene chloride / N,N-dimethylacetamide (DCM / DMAC) mass ratio and relative humidity in Examples 1-10

[0065] Example polystyrene Titanium dioxide DCM / DMAC Relative humidity Example 1 10wt% 1.0wt% 10:1 45％ Example 2 5wt% 1.0wt% 10:1 45％ Example 3 20wt% 1.0wt% 10:1 45％ Example 4 7wt% 0.5wt% 10:1 45％ Example 5 7wt% 1.5wt% 10:1 45％ Example 6 7wt% 2.0wt% 10:1 45％ Example 7 7wt% 1.0wt% 8:1 45％ Example 8 7wt% 1.0wt% 12:1 45％ Example 9 7wt% 1.0wt% 10:1 30％ Example 10 7wt% 1.0wt% 10:1 55％

[0066] In Exam...

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Abstract

The invention provides a composite filtering material and a preparation method thereof. The composite filtering material is prepared by sequentially depositing and compounding fiber filtering layers from micron to submicron and then from micron to nanometer, and comprises a non-woven fabric primary-effect filter layer, a porous micro-nano fiber medium-effect filter layer, a cobweb nano fiber high-efficiency filter layer and a composite layer which is arranged between the adjacent filter layers and formed by fibers in the adjacent filter layers in an interpenetrating manner. The preparation method comprises the following steps: firstly, preparing the non-woven fabric primary-effect filter layer by using a plane receiving type centrifugal spinning process, and then sequentially receiving anddepositing the porous micro-nano fiber medium-effect filter layer and the cobweb nano fiber high-efficiency filter layer on the surface of the non-woven fabric primary-effect filter layer by using anelectrostatic spinning process to prepare the multi-stage structure composite filter material with the pore diameter changing along the thickness direction in a gradient manner. The composite filtering material not only has excellent air filtering performance, but also has photocatalysis and antibacterial performance.

Description

technical field [0001] The invention relates to the field of filter material preparation, in particular to a composite filter material and a preparation method thereof. Background technique [0002] Traditional filter materials have problems such as low filtering effect on fine and nano particles, difficulty in achieving high efficiency and low resistance. Electrospun nanofiber materials have the advantages of small fiber diameter, large specific surface area, small pore size, high porosity and good connectivity of pores inside the fiber membrane, which can effectively intercept tiny particles in the air and greatly improve the air quality of the fiber material. Filtration performance. At present, some studies have found that further refining the fiber diameter can significantly improve the air filtration performance of the material, but the fiber diameter is mostly above 100nm, which is difficult to further refine, which severely limits the substantial improvement of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B01D46/00D01D5/18D01D5/00D04H1/728D01D5/24D04H1/4382D01F1/10D01F6/74D01F6/56D01F6/94
CPCB01D39/14B01D46/0001B01D46/0027B01D46/0028B01D46/0036B01D2239/0407B01D2239/0442B01D2239/065B01D2239/10D01D5/003D01D5/0084D01D5/18D01D5/24D01F1/103D01F6/56D01F6/74D01F6/94D04H1/4382D04H1/728
Inventor 吴龙涛王亚飞宋宝祥刘欣邓波张小宇陈凯
Owner JIANGSU YIMAO FILTER MEDIA CO LTD
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