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Porous polytetrafluoroethylene film and air filter filtration material

A technology of polytetrafluoroethylene and air filter, which is applied in the field of air filter material and polytetrafluoroethylene porous membrane, which can solve the problem of falling and achieve the effect of small and light weight

Active Publication Date: 2014-03-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Pressure loss and collection efficiency are important as the characteristics of air filter media. However, if one of these two characteristics increases, the other tends to decrease, and it is difficult to balance these two characteristics.

Method used

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  • Porous polytetrafluoroethylene film and air filter filtration material
  • Porous polytetrafluoroethylene film and air filter filtration material
  • Porous polytetrafluoroethylene film and air filter filtration material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] 19 parts by weight of a liquid lubricant (dodecane) were uniformly mixed with 100 parts by weight of PTFE fine powder ("Polyflon F-104" manufactured by Daikin Corporation, SSG2.171) to obtain a mixture. The mixture was then extruded into sheets using an extruder equipped with a fishtail die. The extruded PTFE sheet had a thickness of 1.5 mm and a width of 20 cm.

[0114] Furthermore, the PTFE sheet was rolled by passing between a pair of metal rolling rolls. The calendering was carried out while stretching the PTFE sheet in its longitudinal direction using a roll disposed downstream of the calendering rolls so that the length of the PTFE sheet in the width direction remained unchanged before and after calendering. The thickness of the rolled PTFE sheet was 200 μm.

[0115] Next, using a tenter, the rolled PTFE sheet was stretched 4 times in the width direction while containing a liquid lubricant. Then, the stretched PTFE sheet was kept at 150° C., and the liquid lubr...

Embodiment 2

[0121] A PTFE porous membrane was produced in the same manner as in Example 1 except that the stretch ratio in the longitudinal direction of the PTFE sheet after removal of the liquid lubricant was set to 14 times. Moreover, using this PTFE porous membrane, it carried out similarly to Example 1, and produced the air filter unit.

Embodiment 3

[0123] A PTFE porous membrane was produced in the same manner as in Example 2, except that the stretching temperature when stretching the PTFE sheet from which the liquid lubricant had been removed was 60° C. in the width direction. Moreover, using this PTFE porous membrane, it carried out similarly to Example 1, and produced the air filter unit.

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Abstract

Provided is a porous polytetrafluoroethylene (PTFE) film which has a PF value of 36 or more and a weight per unit area of 0.90 g / m2 or less. In this connection, the PF value is equal to {-log(PT(%) / 100) / (PL(Pa) / 9.8}*100. In the formula, PT (permeability) is determined by PT (%) = 100 - CE (%); CE (collection efficiency) is determined by the value that is measured using a dioctylphthalate having a particle diameter of 0.10-0.20 [mu]m at a permeation flow rate of 5.3 cm / second; and PL (pressure loss) is determined by the value that is measured at a permeation flow rate of 5.3 cm / second. This porous PTFE film is suitable as an air filter filtration material.

Description

technical field [0001] The present invention relates to a polytetrafluoroethylene (hereinafter referred to as "PTFE") porous membrane and an air filter material using the polytetrafluoroethylene porous membrane. Background technique [0002] In general, porous PTFE membranes are produced by extrusion molding a mixture obtained by mixing PTFE fine powder and a liquid lubricant as an extrusion aid, calendering the obtained molded body into a sheet, and obtaining The liquid lubricant is removed from the PTFE sheet, and the PTFE sheet from which the liquid lubricant is removed is stretched to make it porous (for example, Patent Document 1). It is well known that the thus obtained porous PTFE membrane has a porous structure composed of nodes (nodules) and fibrils (fibers). [0003] When used as a collection layer of an air filter medium, a porous PTFE membrane is usually bonded to an air-permeable support material such as nonwoven fabric in order to impart the necessary strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00B01D39/16B01D46/52B01D46/54B01D71/36C08J9/26
CPCB01D46/54B01D69/02B01D39/2068B01D71/36B01D46/521B01D67/0027B29C55/005B29K2027/18B29C55/14B29C55/18B01D39/1692
Inventor 森将明堀江百合岛谷俊一
Owner NITTO DENKO CORP
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