Method for preparing melt-blown polypropylene electret filter material

A technology of melt-blown polypropylene and filter materials, which is applied in the direction of filtration separation, separation methods, chemical instruments and methods, etc., and can solve the practical requirements of application limitations, single types of filter materials, and uniform electret electric field stability and other problems to achieve the effects of slow pressure loss, improved economic benefits, and excellent filtration efficiency

Inactive Publication Date: 2012-03-21
HANGZHOU DIANZI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to technical problems, the polypropylene melt-blown nonwoven fabric filter material cannot meet the practical requirements in terms of product uniformity and electret electric field stability, and the variety of filter materials is single, and its application is still limited.

Method used

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  • Method for preparing melt-blown polypropylene electret filter material
  • Method for preparing melt-blown polypropylene electret filter material
  • Method for preparing melt-blown polypropylene electret filter material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of melt-blown polypropylene electret filter material, comprising the following steps:

[0037] 1) Modification of polypropylene: the raw polypropylene is melted, mixed with 4Wt% additives, and the melt index is controlled to 1200 to obtain modified polypropylene; the additives are modified rosin, stearate, ethylene distearate Amide blend.

[0038] 2) Meltblown preparation process:

[0039] a) Select a spinneret with an aperture diameter of 0.3 microns and an aspect ratio of 15, and in the molten state, feed the modified polypropylene melt into the spinneret with a metering pump;

[0040] b) The temperature of the extruder is controlled at 220°C, the temperature of the spinneret is controlled at 260°C, and the frequency of the metering pump is controlled at 25Hz, and the modified polypropylene melt is extruded from the spinneret hole.

[0041] c) Blow the melt extruded from the spinneret hole into ultra-fine fibers with high-speed hot air, make it fl...

Embodiment 2

[0045] A preparation method of melt-blown polypropylene electret filter material, comprising the following steps:

[0046] 1) Modification of polypropylene: the raw polypropylene is melted, mixed with 3Wt% additives, and the melt index is controlled to 1100 to obtain modified polypropylene; the additives are modified rosin, stearate, ethylene distearate Amide blend.

[0047] 2) Meltblown preparation process:

[0048] a) Select a spinneret with an aperture diameter of 0.2 microns and an aspect ratio of 12, and in the molten state, feed the modified polypropylene melt into the spinneret with a metering pump;

[0049] b) The temperature of the extruder is controlled at 230°C, the temperature of the spinneret is controlled at 270°C, and the frequency of the metering pump is controlled at 25Hz, and the modified polypropylene melt is extruded from the spinneret hole.

[0050] c) Blow the melt extruded from the spinneret hole into ultra-fine fibers with high-speed hot air, make it ...

Embodiment 3

[0054] A preparation method of melt-blown polypropylene electret filter material, comprising the following steps:

[0055] 1) Modification of polypropylene: the raw polypropylene is melted, mixed with 4.5Wt% additives, and the melt index is controlled to 1300 to obtain modified polypropylene; the additives are modified rosin, stearate, ethylene bihard Fatty amide blend.

[0056] 2) Meltblown preparation process:

[0057] a) Select a spinneret with an aperture diameter of 0.2 microns and an aspect ratio of 16, and feed the modified polypropylene melt into the spinneret with a metering pump in a molten state;

[0058] b) The temperature of the extruder is controlled at 210°C, the temperature of the spinneret is controlled at 250°C, the frequency of the metering pump is controlled at 25Hz, and the modified polypropylene melt is extruded from the spinneret hole.

[0059] c) Blow the melt extruded from the spinneret into ultra-fine fibers with high-speed hot air, make it fly to t...

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Abstract

The invention relates to a method for preparing a melt-blown polypropylene electret filter material. The method comprises the following steps of: 1) modification of polypropylene: melting the raw material, polypropylene, and mixing the melt with an additive to obtain modified polypropylene; 2) melt-blown preparation process: a) in a molten state, feeding the modified polypropylene melt into a spinneret plate by using a metering pump; b) extruding the modified polypropylene melt from a spinneret orifice; and c) blowing the melt extruded out from the spinneret orifice into ultrafine fibers by using high-speed hot air to make the fibers fly to a condenser net curtain to form a fiber net through cooling and bonding; and 3), preparation process of an electret: passing the fiber net obtained instep (2) through an electrode of a corona discharge device and obtaining the electret through the discharging of the electrode. The melt-blown electret high-efficiency filter material obtained by themethod has the advantages of very high electret charge stability, excellent filtering efficiency, very low pressure loss, long service life and optimal economic benefit.

Description

technical field [0001] The invention relates to a preparation method of a melt-blown polypropylene electret filter material, belonging to the fields of purification engineering and air filtration, and specifically includes modification of melt-blown polypropylene raw materials, melt-blown production process control and electret formation process control . technical background [0002] Ordinary air filter materials generally only rely on mechanical blocking, that is, through inertial deposition, gravity deposition, diffusion effect and other mechanisms, to intercept the flowing dust in the gas to achieve the purpose of filtration. [0003] Electret refers to a dielectric material that has the ability to store charge over a long period of time. Compared with traditional filter materials, electret air filter materials have a unique dust filtering mechanism. The electret filter material uses polarized electret fibers, and there is an electrostatic field (usually several hundre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/16
Inventor 陈钢进
Owner HANGZHOU DIANZI UNIV
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