Electret non-woven filtering material with cavity structure, and preparation method thereof

A filter material and electret technology, applied in non-woven fabrics, filtration and separation, membrane filters, etc., can solve the problems of easy loss of charge, prolonging the decay period of electrostatic charge of filter materials, and difficult to guarantee coating fastness. Long-lasting effect

Active Publication Date: 2020-02-21
DONGGUAN YIMAO FILTER MEDIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned prior art also has the following defects: (1) during the needle punching process, friction between the fiber and the metal card clothing generates a large amount of electric charge, and the charge is easily lost during the needle punching process; (2) the emulsion impregnation method is used to form PTFE Coating layer, the coating fastness is difficult to guarantee; (3) It is difficult to extend the electrostatic charge decay period of the filter material to a greater extent only by relying on superhydrophobic properties

Method used

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  • Electret non-woven filtering material with cavity structure, and preparation method thereof
  • Electret non-woven filtering material with cavity structure, and preparation method thereof
  • Electret non-woven filtering material with cavity structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An electret nonwoven filter material with a cavity structure, which is composed of a polypropylene fiber tube loaded with polytetrafluoroethylene on the outer layer and polyethylene terephthalate nanofibers nested in the fiber tube. The average particle diameter of polytetrafluoroethylene is 300nm, and preparation method is as follows:

[0038] S1. Polypropylene is melted to obtain melt spinning raw material a, and thermodynamically incompatible polyethylene terephthalate and cellulose acetate butyrate are melt blended at a mass ratio of 1:9 to obtain melt spinning raw material b;

[0039] S2. The melt-spinning raw material a and the melt-spun raw material b described in step S1 are ejected from the dual-channel coaxial spinneret holes for melt spinning;

[0040] Wherein, the melt-spinning raw material a is ejected from the outer spinneret hole, and the melt-spun raw material b is ejected from the inner spinneret hole; the diameter of the inner spinneret hole of the dou...

Embodiment 2～7

[0048] Compared with Example 1, the electret nonwoven filter material with a cavity structure provided by Examples 2 to 7 differs in that the type of spinning raw material a is shown in Table 1, and the others are basically the same as in Example 1. Same, no more details here. Table 1 also shows the thickness, load capacity and filtration performance related parameters of the electret nonwoven filter materials prepared in Examples 2-7.

[0049] From the performance test results of the electret nonwoven filter materials prepared in Example 1 and Examples 2-7, it can be seen that when the preparation process parameters are basically unchanged, the loading capacity of polytetrafluoroethylene does not change much. When the thickness remains the same and only the type of polyolefin is changed, the static voltage and static voltage persistence of the filter material do not change much, so the interception efficiency and filtration resistance are not much different. From Example 1 a...

Embodiment 8～12

[0053] Compared with Example 1, the electret nonwoven filter material with cavity structure provided by Examples 8 to 12 differs in that the composition of the spinning raw material b is shown in Table 2, and the others are basically the same as in Example 1. Same, no more details here. The electret nonwoven filter materials prepared in Examples 8-12 all have a thickness of 0.8 mm.

[0054] From the performance test results of the electret nonwoven filter materials prepared in Example 1 and Examples 8-12, it can be seen that as the mass ratio of polyester and matrix increases, the diameter of the polyester fiber filaments in the inner layer increases gradually , the static voltage and static voltage persistence gradually decrease, resulting in a gradual decrease in the interception efficiency of the filter material, and a gradual increase in the filtration resistance. This is because when the matrix content decreases, the space occupied by the matrix decreases, and after solv...

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Abstract

The invention provides an electret non-woven filtering material with a cavity structure, and a preparation method thereof, wherein the filtering material comprises an outer-layer fiber tube and nanometer fiber yarns nested in the outer-layer fiber tube, the outer-layer fiber tube comprises polyolefin fibers and electret material micro-nano particles loaded on the surfaces of the polyolefin fibers,the electret material micro-nano particles are loaded on the surface of the polyolefin fiber through molten gas flow jetting, the electret material micro-nano particles and the polyolefin fiber generate electret charges through friction under the action of gas flow jetting, and the nanometer fiber yarns are thermoplastic polyester fiber yarns with a diameter of less than or equal to 200 nm. According to the invention, the electret charges are continuously formed under the friction action of the outer-layer electret material micro-nano particle loaded polyolefin fiber tube with a low dielectric constant and the inner-layer polyester nanometer fiber yarn with a high dielectric constant, so that the electrostatic adsorption durability is improved.

Description

technical field [0001] The invention belongs to the technical field of filter materials, and in particular relates to an electret non-woven filter material with a cavity structure and a preparation method thereof. Background technique [0002] With the improvement of living standards, people pay more and more attention to the index of PM2.5 (fine particles with a particle size below 2.5 microns) in the air. Suspended particles in the air can be inhaled, and after entering the human body, they can directly cause serious harm to the human respiratory tract, cardiovascular system and central nervous system, and may even cause lung and systemic inflammation, increase the risk of arteriosclerosis and hyperlipidemia, and cause arrhythmia , Elevated blood pressure and other symptoms. Therefore, how to remove these dusty gases has become an urgent problem to be solved. [0003] In recent years, electret filter material has become an important way to effectively prevent and control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B01D39/16D04H1/4382D01D5/34
CPCB01D39/14B01D39/1623D04H1/4382D01D5/34B01D2239/0618B01D2239/10B01D2239/0622B01D2239/0407B01D2239/0233B01D2239/04
Inventor 吴龙涛陈利军刘双全王亚飞宋宝祥
Owner DONGGUAN YIMAO FILTER MEDIA
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