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Breathable microporous membrane filter material and preparation method thereof

A microporous membrane and air permeability technology, which is applied in the field of air permeability microporous membrane filter material and its preparation, can solve the problems of reducing the air permeability of the bag filter, easily adhering dust, reducing the filtering effect of the bag filter, etc. The effect of improving air permeability, improving air permeability and fastness

Pending Publication Date: 2022-07-15
SHANGHAI BG INDAL FABRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the film-coated filter material bonded with an adhesive is used in high-temperature industries such as thermal power generation and steel, the adhesive will melt and become a liquid that adheres to the surface of the bag filter when heated, making the surface of the bag filter easy to stick. Dust is attached, and after dust agglomerates, the air permeability of the bag filter is reduced, thereby reducing the filtering effect of the bag filter

Method used

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  • Breathable microporous membrane filter material and preparation method thereof
  • Breathable microporous membrane filter material and preparation method thereof
  • Breathable microporous membrane filter material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] An air-permeable microporous membrane filter material is formed by hot pressing and laminating a base material and a microporous membrane in sequence from bottom to top.

[0056] The base material is glass fiber needle felt, the thickness is 2.5-3.5mm, and the air permeability is 10-15m 3 / m 2 ·min, gram weight is 750g / m 2 .

[0057] The thickness of the microporous membrane is 10-16μm, and the air permeability is 70-130L / m 2 The width of the microporous membrane is 2500-2700mm, and the gram weight is 2-6g / m 2 .

[0058] The preparation steps of the above-mentioned breathable microporous membrane filter material are as follows:

[0059] After dipping the base material in the PTFE aqueous solution, the impregnated base material is obtained; then the microporous membrane is flattened on the impregnated base material for hot pressing and lamination, and then naturally dried to obtain the air permeable microporous membrane filter material ;

[0060] Wherein, the PTFE...

Embodiment 2-5

[0065] A breathable microporous membrane filter material, the difference from Example 1 is that the weight ratio of PTFE dispersion emulsion and water is different.

[0066] The weight ratio of the PTFE dispersion emulsion and water of Examples 2-5 is shown in the following table.

[0067]

[0068] The air permeability, fastness test and filtration resistance test were carried out on the air permeable microporous membrane filter materials obtained in the above examples 1-5, and the test results are shown in the following table.

[0069]

[0070]

[0071] It can be seen from the data analysis in the above table that the air permeability of the air permeability microporous membrane filter material obtained in Examples 1-5 of the present application is as high as 2.49-2.51m at 25°C / 2h. 3 / m 2 ·min, the air flow at 190℃ / 2h is as high as 2.46-2.47m 3 / m 2 ·min, the film fastness is 00.031-0.032MPa. After the fastness test, there is no film cracking and demoulding phenom...

Embodiment 6-8

[0073] A kind of air permeability microporous membrane filter material, the difference with embodiment 3 is, in the preparation step of air permeability microporous membrane filter material, hot pressing temperature is different.

[0074] The hot pressing temperatures of Examples 6-8 are shown in the table below.

[0075]

[0076] The air permeability, fastness test and filtration resistance test were carried out on the air permeability microporous membrane filter material obtained in the above Examples 6-8, and the test results are shown in the following table.

[0077]

[0078] From the analysis of the above table, it can be seen that the air permeability of the microporous membrane filter material obtained in Examples 6-8, the air permeability of 25°C / 2h, the air permeability of 190°C / 2h, the film fastness, and the filtration resistance are significantly higher. The air permeability of the microporous membrane filter material obtained in Example 3, the air permeabilit...

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Abstract

The invention relates to the technical field of industrial dust removal, in particular to an air-permeable microporous membrane filter material and a preparation method thereof. The preparation method of the air-permeable microporous membrane filter material comprises the following steps: dipping a base material in a PTFE (Polytetrafluoroethylene) aqueous solution to obtain a dipped base material; and paving the microporous membrane on the impregnated base material, and carrying out hot pressing and laminating to obtain the air-permeable microporous membrane filter material. In the hot-pressing lamination, the hot-pressing temperature is 350-380 DEG C, the pressure is 2-4 MPa, and the hot-pressing rice speed of the impregnated base material and microporous membrane is 5-10 m / min; the base material is impregnated with the PTFE aqueous solution, and then the impregnated base material and the microporous membrane are subjected to hot-pressing lamination under the conditions of the temperature and the pressure, so that the air-permeable microporous membrane filter material obtained by the invention not only can be prepared in safe steps and is environment-friendly, but also has the advantages of strong air permeability and high fastness when being used at high temperature.

Description

technical field [0001] The application relates to the technical field of industrial dust removal, and more particularly, to a gas-permeable microporous membrane filter material and a preparation method thereof. Background technique [0002] Bag filter, also known as filter filter, is a dry high-efficiency filter. It is a dust removal device that uses a bag filter material made of fiber woven fabric to capture solid particles in dust-laden gas. The bag filter can capture and filter the dust generated in thermal power generation, steel, coking, non-ferrous smelting and cement industries, which is beneficial to reduce environmental pollution. [0003] The bag filter is generally composed of a microporous membrane and a substrate. By laminating the microporous membrane and the substrate, a bag filter material with good filtering and intercepting effect on dust can be obtained. Currently, microporous membranes and substrates are usually bonded with adhesives. [0004] However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D67/00B01D61/14B01D46/54B01D46/02B01D39/08B32B37/06B32B37/10B32B33/00B32B3/24B32B27/34B32B27/06
CPCB01D69/10B01D69/12B01D67/0088B01D67/0095B01D61/147B01D46/543B01D46/02B01D39/083B32B37/06B32B37/10B32B33/00B32B3/266B32B27/34B32B27/06B01D2325/02B01D2323/50B01D2323/46
Inventor 刘书平
Owner SHANGHAI BG INDAL FABRIC