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Electret air filtering material

An air filter material and electret technology, which is applied in the fields of filtration and separation, chemical post-processing of rayon, chemical characteristics of fibers, etc., can solve the problems of short service life, low filtration efficiency, large pressure loss, etc., to reduce loss, reduce Economic loss, the effect of slow rise in pressure loss

Active Publication Date: 2008-02-20
TONGXIANG JIANMIN FILTER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional melt-blown process uses a set of spinnerets, which can only form a melt-blown non-woven fabric with a single wire diameter distribution, which has the defects of low filtration efficiency, large pressure loss, and short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of embodiment 1 electret air filter material

[0030] (1) Prepare the double-layer composite fiber that is made up of pre-filter layer and main filter layer earlier, wherein the fiber diameter of pre-filter layer is distributed in 3-10 micron; The fiber diameter of main filter layer is distributed in 1-5 micron; Double layer The composite fiber is made by the melt-blown process. The pre-filter layer and the main filter layer are extruded separately by double spinnerets. Double-layer composite fibers with different filament diameter distribution; the spinneret diameter of the pre-filter layer is 0.4 microns, and the aspect ratio is 8; the spinneret diameter of the main filter layer is 0.2 microns, and the aspect ratio is 13. The materials of the pre-filter layer and the main filter layer are selected from polypropylene.

[0031] (2) The product is obtained by injecting the double-layer composite fiber; using the corona discharge method to inject the elec...

Embodiment 2

[0032] The preparation of embodiment 2 electret air filter material

[0033] (1) first prepare the double-layer composite fiber that is made up of pre-filter layer and main filter layer, wherein the fiber diameter of pre-filter layer is distributed in 3-10 micron; The fiber diameter of main filter layer is distributed in 1-5 micron; The material of the main filter layer is selected from polypropylene, which is extruded through a spinneret with a diameter of 0.2 microns and an aspect ratio of 13; the pre-filter layer is made of polypropylene non-woven fabric prepared by a spunbond method. The filter layer and the pre-filter layer are compounded by thermal bonding.

[0034] (2) The product is obtained by injecting the double-layer composite fiber; the electrode is injected by electric breakdown polarization, and the positive electrode of the injection plate voltage is selected to be 20KV, and the negative electrode is selected to be 25KV.

Embodiment 3

[0035] The preparation of embodiment 3 electret air filter material

[0036] (1) Prepare the double-layer composite fiber that is made up of pre-filter layer and main filter layer earlier, wherein the fiber diameter of pre-filter layer is distributed in 3-10 micron; The fiber diameter of main filter layer is distributed in 1-5 micron; Double layer The composite fiber is made by the melt-blown process. The pre-filter layer and the main filter layer are extruded separately by double spinnerets. Double-layer composite fibers with different filament diameter distribution; the spinneret diameter of the pre-filter layer is 0.4 microns, and the aspect ratio is 8; the spinneret diameter of the main filter layer is 0.2 microns, and the aspect ratio is 13. The material of the main filter layer is selected from polypropylene, and the pre-filter layer is selected from polyethylene terephthalate.

[0037] (2) The product is obtained by injecting the double-layer composite fiber; using the...

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Abstract

The present invention relates to an electrets air filtering material. The present invention is made by the method as follows: (1) prepare a dual-layer composite fiber which consists of a pre-filtering layer and a main filtering layer, wherein the diameter of the fiber of the pre-filtering layer is distributed ranging three micrometer to ten micrometer, while the diameter of the fiber of the main filtering layer is distributed ranging one micrometer and five micrometer;(2) then electret the dual-layer composite fiber to form the product. The present invention has the advantages of extremely high electrets electric charge stability, prominent filtering efficiency, low pressure loss and long service life.

Description

(1) Technical field [0001] The invention relates to an electret air filter material. (2) Background technology [0002] The production process of melt-blown nonwovens is to first melt the polymer into a melt, send it into the extrusion cavity, and extrude it through a row of flat spinneret holes. The high-speed hot air flow is introduced by the pipe and ejected from the flat slits on the upper and lower sides of the spinneret at high speed. It disperses and breaks the unformed melt stream to form extremely fine irregular ultra-fine short fibers. It is then condensed on a perforated drum or screen to form a web, and finally the web is bonded to itself or thermally bonded to form a nonwoven. Meltblown nonwovens are mainly used as high-efficiency air filter materials, oil-absorbing felts, medical and sanitary products, etc., and are a kind of nonwovens with great development prospects. The traditional melt-blown process uses a set of spinnerets, which can only form a melt-blo...

Claims

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Application Information

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IPC IPC(8): B01D39/04B01D39/16D01F8/06D01F11/00B29C59/10B29C71/00
Inventor 陈钢进陈胜发
Owner TONGXIANG JIANMIN FILTER MATERIALS
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