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Efficient electret filtration material and preparation method thereof

A high-efficiency filtration and electret technology, applied in filtration and separation, separation methods, dispersed particle filtration, etc., can solve problems such as poor filtration effect and weak electrostatic adsorption, and achieve improved service life, easy dust removal, and improved surface filtration. The effect of efficiency

Active Publication Date: 2014-03-26
中科瑞阳膜技术(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used fiber filter materials mainly rely on mechanical barriers such as Brownian diffusion, interception, inertial collision and direct interception. The electrostatic adsorption between filter materials and particles is very weak, so the filtering effect on particles with a particle size of less than 1m is very poor.

Method used

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  • Efficient electret filtration material and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a preparation method of an electret high-efficiency filter material, comprising the steps of:

[0032] ① forming a non-woven fabric layer; specifically, the non-woven fabric layer is mixed with 30-70wt% polyphenylene sulfide fiber and 30-70wt% polytetrafluoroethylene fiber, carded into a net, and laid and formed after acupuncture.

[0033] Among them, the polyphenylene sulfide fiber (PPS) has a linear density of 1.0-1.5D and a fiber length of 51-76mm, and the polytetrafluoroethylene fiber (PTFE) has a linear density of 1.0-1.5D and a fiber length of 48- 65mm. That is to say, the polyphenylene sulfide fiber and the polytetrafluoroethylene fiber all adopt superfine fiber, which can greatly improve the dust collection efficiency, and its average efficiency is raised from 95% to 99.9% (fine fiber) compared with the traditional structure electret fiber, improving It may be due to the increase in the random distribution rate of free space...

Embodiment 1

[0045] 1. Opening: The non-woven fabric layer is made of 70% polyphenylene sulfide fiber PPS and 30% polytetrafluoroethylene fiber PTFE. After mixing and opening, carding, laying and 5 times of acupuncture A nonwoven felt is formed. The polyphenylene sulfide fiber had a linear density of 1.5D and a fiber length of 60 mm, and the polytetrafluoroethylene fiber had a linear density of 1.0D and a fiber length of 51 mm. Due to the strong electrostatic effect of PTFE fiber, a non-ionic antistatic agent is added during the mixing process.

[0046] 2. Carding: Due to the high density of PTFE fibers, poor single fiber strength and small curl, titanium alloy card clothing is used in the carding process, and the speed of the carding machine is reduced to 750r / min.

[0047] 3. Laying net: small fiber cohesion force, small draft between the trolleys. The speed of the upper trolley is 33m / min, the speed of the laying trolley is 40m / min, and the speed of the lower trolley is 12m / min.

[0...

Embodiment 2

[0056] 1. Opening: The non-woven fabric layer is made of 50% polyphenylene sulfide fiber PPS and 50% polytetrafluoroethylene fiber PTFE as raw materials, after mixing and opening, carding, laying and 5 needle punches A nonwoven felt is formed. The polyphenylene sulfide fiber had a linear density of 1.0D and a fiber length of 51 mm, and the polytetrafluoroethylene fiber had a linear density of 1.0 and a fiber length of 51 mm. Due to the strong electrostatic effect of PTFE fiber, a non-ionic antistatic agent is added during the mixing process.

[0057] 2. Carding: Due to the high density of PTFE fibers, poor single fiber strength and small curl, titanium alloy card clothing is used in the carding process, and the speed of the carding machine is reduced to 700r / min.

[0058] 3. Laying net: small fiber cohesion force, small draft between the trolleys. The speed of the upper trolley is 30m / min, the speed of the laying trolley is 34m / min, and the speed of the lower trolley is 10m / ...

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Abstract

The invention discloses an efficient electret filtration material and a preparation method thereof. The efficient electret filtration material comprises a non-woven fabric layer and a charged coating being subjected to an electret treatment, wherein the coating is positioned on the outer surface of the non-woven fabric layer. The preparation method comprises: (1) forming a non-woven fabric layer; (2) molding a coating on the outer surface of the non-woven fabric layer in a foaming manner; and (3) carrying out an electret treatment on the coating to make the coating be the electret. The efficient electret filtration material has effects of high filtration precision, low filtration resistance, high filtration efficiency, easy ash cleaning and improved filtration material service life.

Description

technical field [0001] The invention relates to the field of filter materials, in particular to an electret high-efficiency filter material and a preparation method thereof. Background technique [0002] Due to the deteriorating environmental problems and the smog becoming more and more serious, PM2.5 has attracted the attention of various departments. According to statistics, in the first half of 2013, Beijing’s PM2.5 was as high as 950mg / m3 at some time, and the PM2.5 in 74 cities in China was 70mg / m3, which was 25mg / m3 as required by the World Health Organization. The smog in Beijing and other cities is serious, which is harmful to the environment. Serious pollution has seriously affected the quality of life of the people. Therefore, higher requirements are put forward for the filter pore size and filtration accuracy of the filter material. The particle size of the general needle-punched filter is 5-10um, and the particle size of the film-covered needle-punched filter is...

Claims

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Application Information

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IPC IPC(8): B01D39/14B01D46/10
Inventor 施纯秒杨泽林吴锐
Owner 中科瑞阳膜技术(北京)有限公司
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