Permanent hot-melt electret melt-blown filtering material preparing method

Abstract

The present invention relates to a method of producing a permanent hot-melting electret spurt filter material. The art project: Mix the high melt fat Isotactic polypropylene slice, the masterbatch and the function masterbatch, malt them in the screw extruder after mix them. Hot up and then feed into the die-head, the fiber that comes from the die-head get into the strong electric field. And keep in it until cool down. Meanwhile the hot air draws the fiber to become superfine fiber. And the superfine fiber is spurted onto the net curtain straightly after being cooled by the room temperature air which coming from the both side of the die head, and become the permanent hot-melting electret spurt filter material. The beneficial effect:: the filter efficiency of this material can reach 99.95%; and the capability target can not weaken because of the change of the environment. So it can be used in many fields, such as industry, agriculture, medical and so on.

Description

1. Technical field: [0001] The invention relates to a method for manufacturing an electret melt-blown filter material, in particular to a method for manufacturing a permanent hot-melt electret melt-blown filter material. 2. Background technology: [0002] Electret melt-blown filter material is one of the main materials in medical protection, especially during SARS and bird flu, this material has been widely promoted. Conventional electret melt-blown filter material processing methods include: 1. The formed melt-blown cloth passes through the discharge zone at a certain speed to complete the electret. 2. Add tourmaline particles to the isotactic polypropylene raw material with high melting index, and spin The wire completes the electret. The static electricity of No. 1 electret method is unstable, and the static electricity is prone to attenuation during use and transportation; due to the relatively large impact of the environment, the application field of this kind of elect...

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Problems solved by technology

The static electricity of No. 1 electret method is unstable, and the static electricity is prone to attenuation during use and transportation; due to the relatively large impact of the environment, the application field of this kind of electret product is subject to certain restrictions, such as the field with too much humidity: spray paint in industry , Pesticide spraying in agriculture; the No. 2 electret method is made by adding tourmaline masterbatch, although the particle size of this tourmaline can reach 0.5 microns, but because tourmaline is a solid material, after mixing with molten polypropylene It is easy to cause broken wires and form shot (crystal beads formed after broken wires, with pinholes around the large crystal beads) which will affect the efficiency of the final product. The filtration efficiency of products made by this electret method is difficult to exceed 99%.

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