Electret nonwoven filter material with cavity structure and preparation method thereof

A filter material and electret technology, applied in the direction of non-woven fabrics, separation methods, filtration separation, etc., can solve the problems of easy loss of charge, prolong the static charge decay period of filter materials, and difficulty in guaranteeing coating fastness, etc., to achieve improved persistent effect

Active Publication Date: 2022-02-08
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 nonwoven filter material with cavity structure and preparation method thereof
  • Electret nonwoven filter material with cavity structure and preparation method thereof
  • Electret nonwoven filter 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 nonwoven filter material with a cavity structure and a preparation method thereof. The filter material includes an outer fiber tube and nanofiber filaments nested in the outer fiber tube. The outer fiber tube is composed of polyolefin fibers and electret material micro-nano particles loaded on the surface of the polyolefin fibers. The micro-nano particles of the electret material are loaded on the surface of the polyolefin fiber through the melt-blown airflow injection, and under the action of the airflow injection, the micro-nano particles of the electret material and the polyolefin fiber generate electret charges through friction. The nanofiber filaments are thermoplastic polyester filaments with a diameter less than or equal to 200nm. The present invention continuously forms electret charges through the friction between the polyolefin fiber tube loaded with electret material micro-nano particles with a low outer dielectric constant and the polyester nanofiber filament with a relatively high inner dielectric constant, so as to improve Static cling durability.

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 Patents(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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