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Preparation method for teflon membrane-coated filtering material

A polytetrafluoroethylene membrane and polytetrafluoroethylene technology, which is applied in the field of industrial filter material preparation, can solve problems such as reduction, sintering and clogging of membrane-coated filter materials, and influence, and achieve a short process flow, low cost, and simple operation. Effect

Inactive Publication Date: 2015-10-28
LINGQI ENVIRONMENTAL PROTECTION EQUIP FACTORY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing commonly used polyester / polytetrafluoroethylene film-coated filter material preparation methods are all through the gluing process (CN 101362035A) or the coating sintering process (CN 201889128 U), but whether it is the gluing process or the coating sintering process, and the final film-coated filter material is significantly reduced due to factors such as the voids of the PTFE microporous membrane being blocked by adhesives or sintering clogging, which ultimately affects the filtration efficiency of the filter material

Method used

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  • Preparation method for teflon membrane-coated filtering material

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Effect test

Embodiment 1

[0027] This embodiment relates to a process flow of a preparation method of a polytetrafluoroethylene film-coated filter material such as figure 1 shown, including the following steps:

[0028] 1. After preheating the polytetrafluoroethylene microporous membrane at 105°C in a preheating oven for 15 minutes, use an ion fan to treat it with an ion air volume of 125 (cfm) for 15 minutes to remove the static electricity on the surface of the polytetrafluoroethylene microporous membrane; At the same time, the surface of the polyester spunbonded non-woven fabric is burned at 250°C to increase the specific surface area of ​​the non-woven fabric;

[0029] 2. Compound the polytetrafluoroethylene microporous membrane and polyester spunbond non-woven fabric pretreated in the above steps in a composite oven under a pressure of 0.05MPa at a temperature of 250°C and a composite roller speed of 0.8m / min. , to obtain the polytetrafluoroethylene membrane filter material precursor;

[0030] 3...

Embodiment 2

[0033] This embodiment relates to a process flow of a preparation method of a polytetrafluoroethylene film-coated filter material such as figure 1 shown, including the following steps:

[0034] 1. After preheating the polytetrafluoroethylene microporous membrane in a preheating oven at 65°C for 30 minutes, use an ion fan to treat it with an ion air volume of 45 (cfm) for 30 minutes to remove the static electricity on the surface of the polytetrafluoroethylene microporous membrane; At the same time, the surface of the polyester spunbonded non-woven fabric is burned at 500 ° C to increase the specific surface area of ​​the non-woven fabric;

[0035] 2. Compound the polytetrafluoroethylene microporous membrane and polyester spunbond non-woven fabric pretreated in the above steps in a composite oven under a pressure of 0.05 MPa at a temperature of 200°C and a composite roll speed of 0.8m / min. , to obtain the polytetrafluoroethylene membrane filter material precursor;

[0036] 3....

Embodiment 3

[0039] This embodiment relates to a process flow of a preparation method of a polytetrafluoroethylene film-coated filter material such as figure 1 shown, including the following steps:

[0040] 1. After preheating the polytetrafluoroethylene microporous membrane in a preheating oven at 80°C for 20 minutes, use an ion fan to treat it with an ion air volume of 360 (cfm) for 5 minutes to remove the static electricity on the surface of the polytetrafluoroethylene microporous membrane; At the same time, the surface of the polyester spunbonded non-woven fabric is burned at 480°C to increase the specific surface area of ​​the non-woven fabric;

[0041] 2. Compound the polytetrafluoroethylene microporous membrane and polyester spunbond non-woven fabric pretreated in the above steps in a composite oven under a pressure of 0.05MPa at a temperature of 150°C and a composite roller speed of 0.8m / min. , to obtain the polytetrafluoroethylene membrane filter material precursor;

[0042] 3. ...

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Abstract

The invention provides a preparation method for a teflon membrane-coated filtering material. The preparation method comprises the following steps: separately pretreating a teflon membrane and a terylene spunbonded non-woven fabric; compounding the pretreated teflon membrane and the pretreated terylene spunbonded non-woven fabric so as to obtain a teflon membrane-coated filtering material precursor; and subjecting the teflon membrane-coated filtering material precursor to heat setting so as to obtain the teflon membrane-coated filtering material. A pretreatment method for the teflon microporous membrane comprises a first step of preheating the teflon microporous membrane and a second step of removing static electricity on the surface of the teflon microporous membrane. The invention has the following advantages: the terylene filter material prepared through hot pressing and compounding realizes surface filtering and has improved filtering efficiency, dynamically reaching 99.9995%, which is close to zero discharge; and the membrane-coated filtering material produced by using hot pressing and compounding technology can realize high-efficiency, low-resistance and long-life effect.

Description

technical field [0001] The invention relates to a method for preparing an industrial filter material, in particular to a method for preparing a polytetrafluoroethylene-coated filter material. Background technique [0002] As a kind of dust removal equipment with high dust removal efficiency, the development prospect of bag filter is generally optimistic. Under the macro background of my country's "Twelfth Five-Year Plan" emission reduction, the bag filter industry has ushered in new business opportunities. According to the analysis of industry insiders, due to the high dust removal efficiency, the bag type dust collector will not cause secondary pollution, and it is easy to recycle dry materials. It is more and more widely used at home and abroad. The filter material is the "heart" of the bag filter, which accounts for 20-40% of the cost of the bag filter. In recent years, with the development of bag dust removal technology and industry, dust removal filter materials, espe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B32B27/02B32B27/08B32B27/16B32B37/06
Inventor 茅惠东陈观福寿顾根林庞敏周强陈璀君沈雅菲
Owner LINGQI ENVIRONMENTAL PROTECTION EQUIP FACTORY SHANGHAI
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