Fluorine-based porous membrane and manufacturing method therefor

A porous membrane and fluororesin technology, applied in the field of fluororesin porous membrane, can solve the problems of performance degradation, insufficient air permeability, large size, etc., and achieve the goal of reducing water penetration, reducing porosity, and maintaining internal porosity and air permeability Effect

Pending Publication Date: 2020-04-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the air permeability of the porous film is increased, the size of the formed pores becomes larger, which tends to deteriorate the performance of preventing penetration of water
[0006] In addition, a PTFE multilayer film used as a porous film is well known in the art, but according to a previously known method, since an ordinary hot air system is used at the time of hot firing, the effect of preventing water penetration is relatively low relative to the air permeability is insufficient

Method used

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  • Fluorine-based porous membrane and manufacturing method therefor
  • Fluorine-based porous membrane and manufacturing method therefor
  • Fluorine-based porous membrane and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] [Example 1: Preparation of PTFE porous membrane]

[0073] 100 parts by weight of polytetrafluoroethylene powder (CD145E, AGC) was mixed with 22 parts by weight of a liquid lubricant (trade name: "Isopar H", Exxon Co.) to prepare a single-layer preform.

[0074] Then, the monolayer preform was extruded at a temperature of 50° C. at a rate of 50 mm / minute to produce a sheet with a thickness of about 300 μm. The sheet thus prepared was heated at a temperature of about 200° C. to completely dry the liquid lubricant.

[0075] After the drying step, the preform was uniaxially stretched under the conditions shown in Table 1 below.

[0076] Subsequently, the stretched preform was fired at a temperature of 360° C. for 10 seconds by using a heating roll to obtain a PTFE porous membrane.

Embodiment 2

[0077] [Example 2: Preparation of PTFE porous membrane]

[0078] 100 parts by weight of polytetrafluoroethylene powder (CD145E, AGC) was mixed with 26 parts by weight of a liquid lubricant (trade name: "Isopar H", Exxon Co.) to prepare a single-layer preform.

[0079] Then, the monolayer preform was extruded at a temperature of 50° C. at a rate of 50 mm / minute to produce a sheet with a thickness of about 300 μm. The sheet thus prepared was heated at a temperature of about 200° C. to completely dry the liquid lubricant.

[0080] After the drying step, the preform was uniaxially stretched under the conditions shown in Table 1 below.

[0081] Subsequently, the stretched preform was fired at a temperature of 360° C. for 10 seconds by using a heating roll to obtain a PTFE porous membrane.

Embodiment 3

[0082] [Example 3: Preparation of PTFE porous membrane]

[0083] 100 parts by weight of polytetrafluoroethylene powder (6J, ​​MDF) was mixed with 22 parts by weight of a liquid lubricant (trade name: "Isopar H", Exxon Co.) to prepare a single-layer preform.

[0084] Then, the monolayer preform was extruded at a temperature of 50° C. at a rate of 50 mm / minute to produce a sheet with a thickness of about 300 μm. The sheet thus prepared was heated at a temperature of about 200° C. to completely dry the liquid lubricant.

[0085] After the drying step, the preforms were uniaxially stretched under the conditions shown in Table 1 below.

[0086] Subsequently, the stretched preform was fired at a temperature of 360° C. for 10 seconds by using a heating roll to obtain a PTFE porous membrane.

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Abstract

The present invention relates to: a fluorine-based resin porous membrane in which the difference between the thickness ratio of nodes distributed on any one surface and the thickness ratio of nodes, which are the remainder, distributed on the other surface, is 5% or more on the basis of the total thickness of the fluorine-based resin porous membrane, which is 5-300 [mu]m; a manufacturing method therefor; and a vent filter comprising the fluorine-based resin porous membrane.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2017-0140284 filed with the Korean Intellectual Property Office on October 26, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a fluororesin porous membrane and a method for producing the same, and more particularly, to a fluororesin porous membrane, a method for producing the same, and a breather filter including the porous membrane that allows only the surface to have Reduced porosity and thus reduced water penetration while maintaining internal porosity and air permeability. Background technique [0004] The breather filter using a porous body is used for housings of various devices, and, for example, is mainly applied to electric parts of automobiles such as lamps, motors, various sensors, and pressure switches. Vent filters are also used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D67/00
CPCB01D71/32B01D67/0027B01D69/06B01D2323/42B01D2325/022B01D2325/38B01D2323/081B29C48/0018B29C48/91B01D39/1676B01D46/0001B01D46/543B01D2239/10B01D2239/1216B01D2239/1258B01D2279/35B29C55/06B29C55/08B29K2027/18C08J5/18C08J9/28C08J2201/03C08J2201/0502C08J2205/044C08J2327/18
Inventor 朴世晶尹景焕安秉寅刘韩率
Owner LG CHEM LTD
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