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Method for preparing melt-blown polypropylene electret filter material

A melt-blown polypropylene and filter material technology, applied in the direction of filtration separation, separation methods, chemical instruments and methods, etc., can solve the problem that the stability of the uniform electret electric field cannot meet practical requirements, application limitations, and a single variety of filter materials and other problems to achieve the effect of reducing product loss, slow pressure loss and improving economic benefits

Inactive Publication Date: 2010-12-08
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

[0040] A preparation method for a melt-blown polypropylene electret filter material, comprising the steps of:

[0041] 1), polypropylene modification: melt the raw material polypropylene, mix it with 4wt% additives, control the melt index to 1200, and obtain modified polypropylene; the additives are modified rosin, stearate, ethylene dihard Fatty amide mix.

[0042] 2), Melt-blown preparation process:

[0043]a), select a spinneret with an aperture diameter of 0.3 microns and an aspect ratio of 15, and feed the modified polypropylene melt into the spinneret with a metering pump in a molten state;

[0044] b) Control the temperature of the extruder at 220°C, the temperature of the spinneret at 260°C, and the frequency of the metering pump at 25Hz, and then extrude the modified polypropylene melt from the spinneret hole.

[0045] c), use high-speed hot air to blow the melt extruded from the spinneret hole into ultra-fine fibers, make it fly to the condensed net curtain and coo...

Embodiment 2

[0049] A preparation method for a melt-blown polypropylene electret filter material, comprising the steps of:

[0050] 1), polypropylene modification: melt the raw material polypropylene, mix it with 3wt% additives, control the melt index to 1100, and obtain modified polypropylene; the additives are modified rosin, stearate, ethylene dihard Fatty amide mix.

[0051] 2), Melt-blown preparation process:

[0052] a), select a spinneret with an aperture diameter of 0.2 microns and an aspect ratio of 12, and feed the modified polypropylene melt into the spinneret with a metering pump in a molten state;

[0053] b) Control the temperature of the extruder at 230° C., the temperature of the spinneret at 270° C., and the frequency of the metering pump at 25 Hz, and then extrude the modified polypropylene melt from the spinneret hole.

[0054] c), use high-speed hot air to blow the melt extruded from the spinneret hole into ultra-fine fibers, make it fly to the condensed net curtain a...

Embodiment 3

[0058] A preparation method for a melt-blown polypropylene electret filter material, comprising the steps of:

[0059] 1), polypropylene modification: melt the raw material polypropylene, mix it with 4.5wt% additives, control the melt index to 1300, and obtain modified polypropylene; the additives are modified rosin, stearate, ethylene bismuth Stearamide blend.

[0060] 2), Melt-blown preparation process:

[0061] 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;

[0062] 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 then the modified polypropylene melt is extruded from the spinneret hole .

[0063] c), use high-speed hot air to blow the melt extruded from the spinneret hole into ultra-fine fibers, make i...

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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 in step (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 the method 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 method for preparing a meltblown polypropylene electret filter material, which belongs to the field of purification engineering and air filtration, and specifically includes modification of meltblown polypropylene raw materials, meltblown production process control and electret formation process control . technical background [0002] Ordinary air filter materials generally only rely on mechanical barriers, that is, through mechanisms such as inertial deposition, gravity deposition, and diffusion effects, to intercept the flowing dust in the gas to achieve the purpose of filtration. [0003] Electrets refer to dielectric materials that have the ability to store electric charges for a long time. Compared with traditional filter materials, electret air filter materials have a unique dust filtering mechanism. The electret filter material uses polarized electret fibers. There is an electrostatic field (usually with a voltage of...

Claims

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Application Information

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IPC IPC(8): B01D39/16
Inventor 陈钢进
Owner HANGZHOU DIANZI UNIV
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