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A high-efficiency filter material with gradient structure and its production method

A high-efficiency filtration, gradient structure technology, applied in separation methods, filtration separation, membrane filters, etc., can solve the problems of poor gradient filtration effect, too tight material, low filtration efficiency, etc., to achieve better filtration effect, ultra-fine The effect of uniform fiber layer and good connectivity

Active Publication Date: 2022-04-05
南通新绿叶非织造布有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been many researches on air filtration in recent years, they are still not perfect, such as woven fabrics, short-fiber spunlace nonwovens and impregnated composite filter materials. The cost is high, the overall pores are reduced after resin impregnation, and the filtration efficiency is low.
In addition, there are sea-island fiber nets, ordinary fiber nets, reinforced fabrics and ordinary fiber net gradient filter materials, which are compounded by acupuncture or spunlace. As a result, the materials are too compact and the gradient filtration effect is not good.

Method used

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  • A high-efficiency filter material with gradient structure and its production method

Examples

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example 1

[0027] A preparation process of a high-efficiency filter material with a gradient structure, comprising the following steps:

[0028] (1) Preparation of coarse mixed needle felt layer 1: Mix polyester fibers with a thickness of 2.5-3D and a length of 51mm with ES fibers at a ratio of 6:4, open and card to form a uniform fiber web, and feed it into the needle punching machine through Pre-needling and one needling to obtain a coarse mixed needle-punched felt layer 1 with a grammage of 100-150g / m²;

[0029] (2) Preparation of fine mixed needle-punched felt layer 2: Mix polyamide fibers with a thickness of 1.5-2D and a length of 38mm with ES fibers at a ratio of 6:4, open and card to form a uniform fiber web, and then enter the needle through the mesh curtain. In the punctured area, the fibers are kept perpendicular to the needles, and a fine mixed needle-punched felt layer 2 with a grammage of 60-80g / m² is obtained after two passes of needling;

[0030] (3) Preparation of micro-...

example 2

[0034] A preparation process of a high-efficiency filter material with a gradient structure, comprising the following steps:

[0035] (1) Preparation of coarse mixed needle felt layer 1: Mix polyphenylene sulfide fibers with a thickness of 2.5-3D and a length of 51mm with ES fibers at a ratio of 6:4, open and card to form a uniform fiber web, and feed it into the needle punched felt. The machine undergoes pre-needling and one needling to obtain a coarse mixed needle-punched felt layer 1 with a grammage of 100-150g / m²;

[0036] (2) Preparation of fine mixed needle-punched felt layer 2: Mix polyacrylonitrile fibers with a thickness of 1.5-2D and a length of 38mm with ES fibers at a ratio of 6:4, open and card to form a uniform fiber web, and then enter the In the needling area, the fibers are kept perpendicular to the needling needles, and a fine mixed needle-punched felt layer 2 with a grammage of 60-80g / m² is obtained after two passes of needling;

[0037] (3) Preparation of ...

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Abstract

The invention discloses a high-efficiency filter material with a gradient structure. The high-efficiency filter material with a gradient structure is composed of four filter layers with gradients and different apertures. The first filter layer is coarse mixed needle felt layer, the second filter layer is a fine mixed needle felt layer, the third filter layer is a fine non-woven fabric layer, and the fourth filter layer is a hollow electrospun ultrafine fiber layer; the first to fourth filter layers The pore size on the filter layer decreases gradually in a gradient. The invention takes environmental protection as the invention principle, and aims to improve the efficiency and strength of filter materials and enhance the connectivity of composite materials; it adopts non-woven acupuncture, wet-laid, hot air, and hollow electrospinning technology to ensure good mechanical strength and at the same time , the hollow microfiber layer is introduced, and the obtained high-efficiency filter material with gradient structure has good filtering effect, low filter resistance, and excellent mechanical properties. The materials are reinforced by self-bonding, and the connection is good. .

Description

technical field [0001] The invention relates to a high-efficiency filter material with a gradient structure, in particular to a high-efficiency filter material with a gradient structure and a production method thereof. Background technique [0002] As the problem of air pollution in the middle of the country has been paid more attention, there are higher requirements for the comprehensive indicators of filter materials. Most of the traditional medium air filter materials are made of needle-punched non-woven fabric, and a layer of microporous membrane is coated on the surface, so as to have a certain medium air filtration effect. However, after repeated use, the microporous membrane and needle-punched non-woven fabric The material connectivity between them is significantly reduced, and the microporous membrane is broken, and the overall performance is poor. At present, electrospinning and melt-blown nonwoven technologies have matured, and ultrafine fibers reach the micron or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/541D04H1/544D04H1/559D04H1/728D04H1/46D04H1/4382D04H1/4391D04H1/4374B01D39/16
CPCD04H1/541D04H1/544D04H1/559D04H1/728D04H1/46D04H1/4382D04H1/4391D04H1/4374B01D39/1607B01D2239/10B01D2239/0681
Inventor 李素英刘诺王洪云张海峰王小美
Owner 南通新绿叶非织造布有限公司