JP2008136908A - Water-repellent air-permeable material - Google Patents

Water-repellent air-permeable material Download PDF

Info

Publication number
JP2008136908A
JP2008136908A JP2006323803A JP2006323803A JP2008136908A JP 2008136908 A JP2008136908 A JP 2008136908A JP 2006323803 A JP2006323803 A JP 2006323803A JP 2006323803 A JP2006323803 A JP 2006323803A JP 2008136908 A JP2008136908 A JP 2008136908A
Authority
JP
Japan
Prior art keywords
average pore
porous membrane
ptfe porous
oil
ventilation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2006323803A
Other languages
Japanese (ja)
Inventor
Ei Sawa
映 佐波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to JP2006323803A priority Critical patent/JP2008136908A/en
Publication of JP2008136908A publication Critical patent/JP2008136908A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Laminated Bodies (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtering Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-permeable material having good oil repellency, water resistance and air permeability. <P>SOLUTION: The air-permeable material contains two polytetrafluoroethylene porous membranes of different average pore sizes, and the membrane of the larger average pore size alone is treated to impart oil repellency. Preferably, the membrane of the larger average pore size preferably has an average pore size of ≥1.0 μm, and that of the smaller average pore size has an average pore size of smaller than 1.0 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ポリテトラフルオロエチレン（以下、ＰＴＦＥという）多孔質膜を用いた通気材に関し、特に、撥油処理を施した通気材に関する。   The present invention relates to a ventilation material using a polytetrafluoroethylene (hereinafter referred to as PTFE) porous membrane, and more particularly to a ventilation material subjected to an oil repellent treatment.

自動車部品、家電製品、情報機器等の筐体に、通気性や通音性を持たせ、かつ水や塵埃の浸入を防止するために、防水通気材が使用されている。なかでも、ＰＴＦＥ多孔質膜を用いた防水通気材は、耐水性および防塵性が高いことから、広く用いられている。   Waterproof breathable materials are used in order to provide air permeability and sound permeability to casings of automobile parts, home appliances, information devices and the like, and to prevent water and dust from entering. Especially, the waterproof ventilation material using a PTFE porous membrane is widely used since it has high water resistance and dust resistance.

ＰＴＦＥ多孔質膜は、高い耐水性を有するものの、ケロシン、軽油などの有機炭化水素、低分子量アルコール、界面活性剤等の表面張力の小さな液体は浸透する。このことは、オイルが付着する可能性のある自動車用途、および洗剤等の界面活性剤が接触する可能性のある家庭用途においては、好ましくない場合がある。   Although the PTFE porous membrane has high water resistance, liquids with a small surface tension such as organic hydrocarbons such as kerosene and light oil, low molecular weight alcohols, surfactants and the like penetrate. This may not be desirable in automotive applications where oils may adhere and household applications where surfactants such as detergents may come into contact.

このような用途においては、ＰＴＦＥ多孔質膜に撥油処理を施す必要がある（例えば、特許文献１参照）。撥油処理は、ＰＴＦＥ多孔質膜に撥油剤を塗布するか、またはＰＴＦＥ多孔質膜を撥油剤に浸漬して行うのが一般的である。撥油剤は、主にアクリル系の主鎖に、フッ素で飽和した炭化水素側鎖（ペルフルオロアルキル基、以下Ｒｆ基ともいう）を有する構造をしている。ＰＴＦＥ多孔質膜を構成する−ＣＦ2−基は、大抵の物質よりも低い表面張力を有する。しかし、撥油剤は、側鎖のＲｆ基が結晶構造をとり、その先端のＣＦ3−基が膜表面で整列するので、通気材の表面張力をより低くする。その結果として、低表面張力の液体の浸透を阻止できるようになる。 In such applications, it is necessary to apply an oil repellent treatment to the PTFE porous membrane (see, for example, Patent Document 1). The oil repellent treatment is generally performed by applying an oil repellent to the PTFE porous membrane or immersing the PTFE porous membrane in the oil repellent. The oil repellent has a structure mainly having a hydrocarbon side chain (perfluoroalkyl group, hereinafter also referred to as Rf group) saturated with fluorine in an acrylic main chain. The —CF 2 — group constituting the PTFE porous membrane has a lower surface tension than most substances. However, in the oil repellent, the Rf group of the side chain takes a crystal structure, and the CF 3 -group at the tip thereof is aligned on the film surface, so that the surface tension of the air-permeable material is further lowered. As a result, the penetration of the low surface tension liquid can be prevented.

特開平０８−２０６４２２JP 08-206422

上記撥油処理は、ＰＴＦＥ多孔質膜の撥油性を高めるための有効な手法であるが、撥油剤の塗布により、通気材の通気量が低下するという問題がある。撥油剤は、ＰＴＦＥ多孔質膜の表面上に被膜を形成するものであり、その過程で細孔の閉塞を伴う。これにより、通気量の低下が起こり、この際、ＰＴＦＥ多孔質膜の細孔が小さいほど、細孔の閉塞度合いも大きくなる（すなわち通気量の低下が大きくなる）。   The oil repellency treatment is an effective technique for improving the oil repellency of the PTFE porous membrane, but there is a problem that the air permeability of the ventilation member is reduced by the application of the oil repellant. The oil repellent agent forms a film on the surface of the porous PTFE membrane, and is accompanied by pore clogging in the process. As a result, the air flow rate decreases, and at this time, the smaller the pores of the PTFE porous membrane, the greater the degree of blockage of the pores (that is, the decrease in the air flow rate increases).

撥油による通気量の低下を抑えるためには、平均孔径が大きいＰＴＦＥ多孔質膜を使用すればよい。しかし、平均孔径が大きいＰＴＦＥ多孔質膜は、耐水圧が低いという問題がある。耐水圧が低いＰＴＦＥ多孔質膜を通気材として筐体に使用すると、筐体内部に水が浸透しやすくなり、用途によって不適当な場合がある。通気量と耐水圧の確保は、通気材にとって重要な問題であり、優れた通気材は、この両者を高いレベルでバランスさせる必要がある。   In order to suppress a decrease in the air flow rate due to oil repellency, a PTFE porous membrane having a large average pore diameter may be used. However, the PTFE porous membrane having a large average pore diameter has a problem that the water pressure resistance is low. When a PTFE porous membrane having a low water pressure resistance is used as a ventilation material in a casing, water easily penetrates into the casing and may be inappropriate depending on the application. Ensuring airflow and water pressure resistance is an important issue for ventilation materials, and an excellent ventilation material needs to balance both at a high level.

そこで本発明は、撥油性、耐水性および通気性の全てが良好である通気材を提供することを目的とする。   Accordingly, an object of the present invention is to provide a ventilation material that is excellent in all of oil repellency, water resistance and air permeability.

本発明者らは、この問題を解決するために、撥油性と耐水性は異なる特性であり、通気材上の同一の面で両特性を発現させることは必ずしも必要ではないという知見を得、撥油性、耐水性および通気性の確保には、通気材を、平均孔径の異なるＰＴＦＥ多孔質膜の積層体とし、その片側のみに撥油処理を施すことが有効であることを見出した。   In order to solve this problem, the present inventors have obtained the knowledge that oil repellency and water resistance are different characteristics, and it is not always necessary to develop both characteristics on the same surface on the ventilation material. In order to ensure oiliness, water resistance and breathability, it has been found that it is effective to use a laminate of PTFE porous membranes having different average pore diameters and to provide an oil repellent treatment only on one side thereof.

すなわち本発明は、平均孔径の異なる２枚のＰＴＦＥ多孔質膜を含み、前記２枚のＰＴＦＥ多孔質膜のうち、平均孔径が大きい方のＰＴＦＥ多孔質膜のみに撥油処理が施されている撥油性通気材である。   That is, the present invention includes two PTFE porous membranes having different average pore diameters, and only the PTFE porous membrane having the larger average pore diameter among the two PTFE porous membranes is subjected to oil repellent treatment. Oil repellent breathable material.

前記２枚のＰＴＦＥ多孔質膜のうち、平均孔径が大きい方のＰＴＦＥ多孔質膜の平均孔径が、１．０μｍ以上であることが好ましく、一方、平均孔径が小さい方のＰＴＦＥ多孔質膜の平均孔径が、１．０μｍ未満であることが好ましい。   Of the two PTFE porous membranes, the average pore size of the PTFE porous membrane having the larger average pore size is preferably 1.0 μm or more, while the average of the PTFE porous membrane having the smaller average pore size is The pore diameter is preferably less than 1.0 μm.

本発明の通気材は、撥油性、耐水性および通気性の全てにおいて良好であり、自動車部品、家電製品、情報機器等の筐体に好適に用いることができる。特に、オイルが付着する可能性のある自動車用途、および洗剤等の界面活性剤が接触する可能性のある家庭用途においても、問題なく用いることができる。   The air-permeable material of the present invention is excellent in all of oil repellency, water resistance and air permeability, and can be suitably used for housings such as automobile parts, home appliances, and information equipment. In particular, it can be used without problems even in automobile applications where oil may adhere and household applications where surfactants such as detergents may come into contact.

本発明は、平均孔径の異なる２枚のＰＴＦＥ多孔質膜を少なくとも含み、前記２枚のＰＴＦＥ多孔質膜のうち、平均孔径が大きい方のＰＴＦＥ多孔質膜に撥油処理が施されている撥油性通気材である。   The present invention includes at least two PTFE porous membranes having different average pore diameters, and of the two PTFE porous membranes, the PTFE porous membrane having the larger average pore diameter is subjected to oil repellency treatment. It is an oil-based ventilation material.

従来の通気材では、ＰＴＦＥ多孔質膜に撥油処理を施した場合には、通気量が低下するという問題があり、通気量を確保しようと平均孔径が大きいＰＴＦＥ多孔質膜を用いると、耐水圧が低下するという問題があった。これに対し、本発明は、通気材を平均孔径の異なるＰＴＦＥ多孔質膜の積層体とし、平均孔径が大きい方のＰＴＦＥ多孔質膜に撥油処理を施して、撥油性と通気性を確保し、さらに、それよりも平均孔径が小さいＰＴＦＥ多孔質膜用いることによって耐水性および通気性を確保し、通気材全体として、撥油性、耐水性および通気性の全てを良好なものとしたものである。   In the conventional ventilation material, there is a problem that when the PTFE porous membrane is subjected to an oil repellency treatment, the amount of ventilation decreases, and when a PTFE porous membrane having a large average pore diameter is used in order to ensure the amount of ventilation, There was a problem that the water pressure decreased. In contrast, in the present invention, the ventilation material is a laminate of PTFE porous membranes having different average pore diameters, and the PTFE porous membrane having the larger average pore diameter is subjected to an oil repellency treatment to ensure oil repellency and air permeability. Furthermore, by using a PTFE porous membrane having an average pore size smaller than that, water resistance and air permeability are ensured, and the entire air-permeable material has good oil repellency, water resistance and air permeability. .

本発明の通気材には、通気性と耐水圧が高いことから、ＰＴＦＥ多孔質膜を用いる。ＰＴＦＥ多孔質膜としては、通気材に用いられている公知のＰＴＦＥ多孔質膜およびそれと同等以上の通気材としての特性（通気性、耐水性）を有するＰＴＦＥ多孔質膜を用いることができる。ＰＴＦＥ多孔質膜は、例えば、ＰＴＦＥファインパウダーからなるペースト押出物を延伸し、焼成して製造することができる。   A PTFE porous membrane is used for the air-permeable material of the present invention because of its high air permeability and high water pressure resistance. As the PTFE porous membrane, a known PTFE porous membrane used for a ventilation material and a PTFE porous membrane having characteristics (air permeability and water resistance) equivalent to or higher than that of the ventilation material can be used. The PTFE porous membrane can be produced, for example, by stretching and firing a paste extrudate made of PTFE fine powder.

平均孔径が大きい方のＰＴＦＥ多孔質膜に撥油処理が施されるが、撥油処理の方法には、特に制限がなく、ＰＴＦＥ多孔質膜に行われている撥油処理法と同様の方法を採用してよい。具体的には、撥油剤としては、フッ素系、シリコーン系等の撥油剤が多数市販されているが、ＰＴＦＥ多孔質膜を上回る撥油性能を発揮するためには、撥油剤を構成する化合物は、フッ素で飽和した炭化水素基（ペルフルオロアルキル基：Ｒｆ基）を側鎖に有する構造である必要がある。当該化合物については、主鎖構造が、ポリアクリレート構造、メタクリレート構造、シリコーン構造のものが市販されている。当該撥油剤は、適当な濃度に希釈して用いてもよい。ＰＴＦＥ多孔質膜に、撥油剤を塗布する方法としては、例えば、キスコーティング法、グラビア塗工法、スプレー塗工法等が挙げられる。また、撥油剤にＰＴＦＥ多孔質膜を浸漬させてもよい。   The PTFE porous membrane having the larger average pore diameter is subjected to oil repellency treatment, but the method of the oil repellency treatment is not particularly limited, and is the same method as the oil repellency treatment method performed on the PTFE porous membrane. May be adopted. Specifically, as the oil repellent, there are many commercially available oil repellents such as fluorine-based and silicone-based, but in order to exhibit oil repellent performance exceeding that of the PTFE porous film, the compound constituting the oil repellent is The structure needs to have a hydrocarbon group (perfluoroalkyl group: Rf group) saturated with fluorine in the side chain. As for the compound, those having a main chain structure of polyacrylate structure, methacrylate structure, and silicone structure are commercially available. The oil repellent may be used after diluted to an appropriate concentration. Examples of the method of applying an oil repellent to the PTFE porous membrane include a kiss coating method, a gravure coating method, and a spray coating method. Further, the PTFE porous membrane may be immersed in the oil repellent.

本発明において平均孔径とは、ＡＳＴＭ Ｆ３１６−８６に基づいて測定されるものであり、例えば、Ｐｏｒｏｕｓ Ｍａｔｅｒｉａｌ Ｉｎｃ．製の「Ｐｅｒｍ−Ｐｏｒｏｍｅｔｅｒ」を用いて測定することができる。   In the present invention, the average pore diameter is measured based on ASTM F316-86, and is described in, for example, Porous Material Inc. It can be measured using “Perm-Porometer”.

本発明において「平均孔径が大きい方のＰＴＦＥ多孔質膜のみに撥油処理が施される」とは、あくまでＰＴＦＥ多孔質膜の、通気、防水、撥油に関する部位に関してのことである。従って、原則的に、平均孔径が小さい方のＰＴＦＥ多孔質膜については、撥油処理を施さないが、平均孔径が小さい方のＰＴＦＥ多孔質膜について、通気材の使用態様に照らして、通気、防水および撥油に無関係の部位（例えば、筐体に嵌合できるよう、樹脂基材を取り付けた通気部材とした際に、樹脂基材に覆われて外気に露出しない部分：多孔質膜の側面など）に撥油処理が施されており、ＰＴＦＥ多孔質膜の通気、防水、撥油に関する部位には撥油処理が施されていないような場合も、平均孔径が大きい方のＰＴＦＥ多孔質膜のみに撥油処理が施されているとみなす。   In the present invention, “only the PTFE porous membrane having the larger average pore diameter is subjected to the oil repellency treatment” refers to a portion of the PTFE porous membrane relating to ventilation, waterproofing, and oil repellency. Therefore, in principle, the PTFE porous membrane having the smaller average pore diameter is not subjected to oil repellency treatment, but the PTFE porous membrane having the smaller average pore diameter is subjected to ventilation, in light of the use mode of the ventilation material, Parts that are unrelated to waterproofing and oil repellency (for example, a portion that is covered with a resin base material and is not exposed to the outside air when the resin base material is attached so that it can be fitted into a casing: the side of the porous membrane PTFE porous membrane having a larger average pore diameter even when the portion of the porous PTFE membrane that is subject to air repellent, water proofing and oil repellency is not subjected to oil repellency treatment. Only oil-repellent treatment is considered.

平均孔径が大きい方のＰＴＦＥ多孔質膜の平均孔径としては、通気性確保の観点から、１μｍ以上が好ましい。ただし、平均孔径が大きすぎると、撥油性が不十分となるおそれがあるため、平均孔径は３μｍ以下が好ましい。   The average pore diameter of the PTFE porous membrane having the larger average pore diameter is preferably 1 μm or more from the viewpoint of ensuring air permeability. However, if the average pore diameter is too large, the oil repellency may be insufficient, so the average pore diameter is preferably 3 μm or less.

平均孔径が大きい方のＰＴＦＥ多孔質膜の厚みは、５〜２００μｍが好ましく、１０〜１００μｍがより好ましい。   The thickness of the PTFE porous membrane having the larger average pore diameter is preferably 5 to 200 μm, more preferably 10 to 100 μm.

平均孔径が大きい方のＰＴＦＥ多孔質膜の通気量は、０．３〜１００秒／１００ｍｌが好ましく、０．５〜３０秒／１００ｍｌがより好ましい。なお、ここでいう通気量は、ＪＩＳ Ｐ８１１７（ガーレー法）により求められる値である。   The aeration rate of the PTFE porous membrane having the larger average pore diameter is preferably 0.3 to 100 seconds / 100 ml, and more preferably 0.5 to 30 seconds / 100 ml. In addition, the ventilation | gas_flowing quantity here is a value calculated | required by JISP8117 (Gurley method).

平均孔径が小さい方のＰＴＦＥ多孔質膜の平均孔径としては、耐水性確保の観点から、１μｍ未満が好ましく、０．５μｍ以下がより好ましい。ただし、平均孔径が小さすぎると、通気性が不十分となるおそれがあるので、平均孔径は０．０５μｍ以上が好ましい。   The average pore size of the PTFE porous membrane having the smaller average pore size is preferably less than 1 μm and more preferably 0.5 μm or less from the viewpoint of ensuring water resistance. However, if the average pore diameter is too small, the air permeability may be insufficient, so the average pore diameter is preferably 0.05 μm or more.

平均孔径が小さい方のＰＴＦＥ多孔質膜の厚みは、５〜２００μｍが好ましく、１０〜１００μｍが好ましい。   The thickness of the PTFE porous membrane having the smaller average pore diameter is preferably 5 to 200 μm, more preferably 10 to 100 μm.

平均孔径が小さい方のＰＴＦＥ多孔質膜の通気量は、５〜１０００秒／１００ｍｌが好ましく、１０〜５０秒／１００ｍｌがより好ましい。なお、ここでいう通気量は、ＪＩＳ Ｐ８１１７（ガーレー法）により求められる値である。   The aeration rate of the PTFE porous membrane having the smaller average pore diameter is preferably 5 to 1000 seconds / 100 ml, more preferably 10 to 50 seconds / 100 ml. In addition, the ventilation | gas_flowing quantity here is a value calculated | required by JISP8117 (Gurley method).

本発明の通気材は、ＰＴＦＥ多孔質膜を組み立て時および使用時のダメージから防護するために、支持体を有していても良い。支持体は、ＰＴＦＥ多孔質膜よりも高い強度を有するものであれば、その材質、形態等に制限はなく、材質の例としては、ポリオレフィン（例、ポリエチレン、ポリプロピレン）、ポリエステル、ポリアミド（脂肪族ポリアミドおよび芳香族ポリアミド）、およびこれらの複合材が挙げられ、形態の例としては、フェルト、不織布、織布、メッシュ（網目状シート）、その他の多孔質材料等が挙げられる。形態が不織布の場合は、これを構成する一部または全部の繊維が芯鞘構造の複合繊維であってもよく、この場合は、芯成分が鞘成分よりも融点が高くなるように、芯成分と鞘成分の材料を選択するとよい。   The air-permeable material of the present invention may have a support in order to protect the PTFE porous membrane from damage during assembly and use. As long as the support has higher strength than the PTFE porous membrane, the material, form, etc. are not limited. Examples of the material include polyolefin (eg, polyethylene, polypropylene), polyester, polyamide (aliphatic Polyamide and aromatic polyamide), and composite materials thereof, and examples of the form include felt, non-woven fabric, woven fabric, mesh (mesh-like sheet), and other porous materials. When the form is a non-woven fabric, some or all of the fibers constituting it may be a composite fiber having a core-sheath structure. In this case, the core component has a higher melting point than the sheath component. And the material of the sheath component may be selected.

本発明の通気材においては、平均孔径が大きい方のＰＴＦＥ多孔質膜の撥油処理された表面が、通気材の、平均孔径が大きい方のＰＴＦＥ多孔質膜側の表面として、外気に露出していることが好ましい。   In the ventilation material of the present invention, the oil repellent surface of the PTFE porous membrane having the larger average pore diameter is exposed to the outside air as the surface of the ventilation material on the side of the PTFE porous membrane having the larger average pore size. It is preferable.

本発明の通気材の厚みは、１０〜１０００μｍが好ましく、５０〜５００μｍが好ましい。   10-1000 micrometers is preferable and, as for the thickness of the ventilation material of this invention, 50-500 micrometers is preferable.

本発明の通気材の通気量は、５〜１０００秒／１００ｍｌが好ましく、１０〜５０秒／１００ｍｌがより好ましい。なお、ここでいう通気量は、ＪＩＳ Ｐ８１１７（ガーレー法）により求められる値である。   The ventilation rate of the ventilation material of the present invention is preferably 5 to 1000 seconds / 100 ml, more preferably 10 to 50 seconds / 100 ml. In addition, the ventilation | gas_flowing quantity here is a value calculated | required by JISP8117 (Gurley method).

本発明の通気材は、例えば、平均孔径の異なる２枚のＰＴＦＥ多孔質膜を用い、平均孔径が大きい方のＰＴＦＥ多孔質膜に上記撥油処理を施し、これを、平均孔径が小さいほうのＰＴＦＥ多孔質膜と積層し、さらに必要に応じて支持体を積層することによって製造することができる。また、平均孔径の異なる２枚のＰＴＦＥ多孔質膜、および必要に応じて支持体を積層し、通気材の平均孔径が大きい方のＰＴＦＥ多孔質膜側の表面に、撥油処理を施すことによっても製造することができる。積層の方法としては、例えば、圧着、接着剤による接着等が挙げられる。接着剤を用いる場合には、通気性を確保するためにＰＴＦＥ多孔質膜等の一部（特に周縁部）のみに接着剤を使用するなど、接着面積を適宜調整するとよい。   The air-permeable material of the present invention uses, for example, two PTFE porous membranes having different average pore diameters, and the PTFE porous membrane having the larger average pore diameter is subjected to the above oil repellency treatment. It can be manufactured by laminating with a PTFE porous membrane and further laminating a support as necessary. Also, by laminating two PTFE porous membranes having different average pore diameters and a support as required, and performing an oil-repellent treatment on the surface of the PTFE porous membrane side having the larger average pore diameter of the ventilation material Can also be manufactured. Examples of the lamination method include pressure bonding and adhesion with an adhesive. In the case of using an adhesive, the adhesive area may be appropriately adjusted, for example, by using an adhesive only for a part (particularly the peripheral portion) of the PTFE porous membrane or the like in order to ensure air permeability.

本発明の通気材の構成例を、図１および図２に示す。図１では、上層部材に、撥油処理された平均孔径が大きい方のＰＴＦＥ多孔質膜１を用い、下層部材に、撥油処理していない平均孔径が小さい方のＰＴＦＥ多孔質膜２を用いた積層体として、通気材が構成されている。ここで、上層とは、使用時に筐体の外側を向くように配置される層であり、水やオイルが付着する可能性のある側の層である。この層で、オイル等の筐体への侵入を阻止し、また、水および塵埃の侵入をいくらか阻止する。下層とは、使用時に筐体の内側を向くように配置される層である。この層で、筐体に水圧や空気圧が掛かった場合の筐体への水の侵入を阻止し、また、より微細な塵埃の侵入を阻止する。図２では、図１の積層体の下層側に、さらに補強目的の支持層として支持体３が積層されて、通気材が構成されている。   The structural example of the ventilation material of this invention is shown in FIG. 1 and FIG. In FIG. 1, a PTFE porous membrane 1 having a larger average pore diameter subjected to oil repellency treatment is used as an upper layer member, and a PTFE porous membrane 2 having a smaller average pore diameter not subjected to oil repellency treatment is used as a lower layer member. A ventilation member is configured as the laminated body. Here, the upper layer is a layer arranged so as to face the outside of the housing when in use, and is a layer on the side where water or oil may adhere. This layer prevents the entry of oil or the like into the housing, and somewhat prevents water and dust from entering. A lower layer is a layer arrange | positioned so that it may face the inner side of a housing | casing at the time of use. This layer prevents water from entering the housing when water pressure or air pressure is applied to the housing, and prevents finer dust from entering. In FIG. 2, a support 3 is further laminated as a support layer for reinforcement purposes on the lower layer side of the laminate of FIG. 1 to form a ventilation material.

本発明の通気材は、撥油性、耐水性および通気性の全てにおいて良好であり、常法に従い、自動車部品、家電製品、情報機器等の筐体に好適に用いることができる。このとき、撥油処理された平均孔径が大きい方のＰＴＦＥ多孔質膜が、筐体の外側を向くように使用するとよい。   The air-permeable material of the present invention is excellent in all of oil repellency, water resistance and air permeability, and can be suitably used for a casing of automobile parts, home appliances, information devices, etc. according to a conventional method. At this time, the PTFE porous membrane having the larger average pore diameter subjected to the oil repellent treatment may be used so as to face the outside of the casing.

以下、実施例および比較例を挙げて本発明を詳細に説明するが、本発明は、これら実施例に何ら制限されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not restrict | limited to these Examples at all.

（ＰＴＦＥ多孔質膜）
ＰＴＦＥ多孔質膜としては、日東電工株式会社より市販されている、表１に示した多孔質膜を使用した。本実施例中でいう通気量は、ＪＩＳ Ｐ８１１７（ガーレー法）によるものである。これは、一定圧力下で１００ｍｌの空気が流れるのに要する時間を示したものであり、値が小さいほど通気量が大きいことを示す。また、平均孔径は、ＡＳＴＭ Ｆ３１６−８６に準拠して、Ｐｏｒｏｕｓ Ｍａｔｅｒｉａｌ Ｉｎｃ．製Ｐｅｒｍ−Ｐｏｒｏｍｅｔｅｒを用いて測定した値である。 (PTFE porous membrane)
As the PTFE porous membrane, the porous membrane shown in Table 1 commercially available from Nitto Denko Corporation was used. The air flow rate in this example is based on JIS P8117 (Gurley method). This indicates the time required for 100 ml of air to flow under a constant pressure, and the smaller the value, the greater the air flow rate. In addition, the average pore diameter is measured according to Porous Material Inc. according to ASTM F316-86. It is the value measured using manufactured Perm-Porometer.

Figure 2008136908
Figure 2008136908

（実施例１）
まずブランクとして、上層部材にＮＴＦ１１３１を、下層部材にＮＴＦ１１２２を用いた積層品を、撥油処理せずに作製した。具体的には、上層部材と下層部材とをゴムロールを用いて圧着した（線圧１ｋｇ／ｃｍ2）。圧着後の通気量を測定したところ、２５秒／１００ｍｌであった。次に、同じ構成で、上層部材のみに撥油処理を施して、積層品を作製した。具体的には、撥油処理は、住友スリーエム株式会社製のフッ素系撥油剤ＦＣ−７２２を用い、これを同社製の希釈剤ＦＰ−５０６０で濃度２．０％に調整した処理液に、上層部材を浸漬した。上層部材を引き上げ、１２０℃の乾燥機で１分間乾燥した。撥油処理した上層部材と下層部材とを、ブランクと同じ条件で圧着した。圧着後の通気量を測定したところ、２８秒／１００ｍｌであった。 (Example 1)
First, as a blank, a laminated product using NTF 1131 as the upper layer member and NTF 1122 as the lower layer member was produced without oil-repellent treatment. Specifically, the upper layer member and the lower layer member were pressure-bonded using a rubber roll (linear pressure 1 kg / cm 2 ). The amount of air flow after pressure bonding was measured and found to be 25 seconds / 100 ml. Next, with the same configuration, only the upper layer member was subjected to oil repellency treatment to produce a laminated product. Specifically, the oil repellent treatment uses a fluorine-based oil repellent FC-722 made by Sumitomo 3M Co., Ltd., and this is adjusted to a concentration of 2.0% with a diluent FP-5060 made by the same company. The member was immersed. The upper layer member was pulled up and dried for 1 minute with a 120 ° C. dryer. The upper layer member and the lower layer member subjected to the oil repellent treatment were pressure-bonded under the same conditions as the blank. The amount of aeration after pressure bonding was measured and found to be 28 seconds / 100 ml.

（実施例２）
上層部材にＮＴＦ１１３３を、下層部材にＮＴＦ１１２２を用い、実施例１と同様の方法で、撥油処理していないブランクの通気材、および上層部材のみ撥油処理した実施例２の通気材を作製した。ブランクの通気材の通気量は、２２秒／１００ｍｌであり、実施例２の通気材の通気量は、２５秒／１００ｍｌであった。 (Example 2)
Using an NTF1133 for the upper layer member and NTF1122 for the lower layer member, a blank ventilation material not subjected to oil repellent treatment and a ventilation material of Example 2 in which only the upper layer member was subjected to oil repellent treatment were produced in the same manner as in Example 1. . The ventilation rate of the blank ventilation material was 22 seconds / 100 ml, and the ventilation rate of the ventilation material of Example 2 was 25 seconds / 100 ml.

（実施例３）
上層部材にＮＴＦ１０３３を、下層部材にＮＴＦ１１２２を用い、実施例１と同様の方法で、撥油処理していないブランクの通気材、および上層部材のみ撥油処理した実施例３の通気材を作製した。ブランクの通気材の通気量は、２３秒／１００ｍｌであり、実施例３の通気材の通気量は、２５秒／１００ｍｌであった。 (Example 3)
Using the NTF 1033 as the upper layer member and NTF 1122 as the lower layer member, a blank air-permeable material that was not oil-repellent treated and the air-permeable material of Example 3 in which only the upper-layer member was oil-repellent treated were produced in the same manner as in Example 1. . The ventilation rate of the blank ventilation material was 23 seconds / 100 ml, and the ventilation rate of the ventilation material of Example 3 was 25 seconds / 100 ml.

（比較例１）
通気材として１枚のＮＴＦ１１２２のみを用いた。実施例１と同様の撥油処理を行い、撥油処理前後で通気量を測定した。撥油処理していない通気材の通気量は、２１秒／１００ｍｌであり、撥油処理した通気材の通気量は、６０秒／１００ｍｌであった。 (Comparative Example 1)
Only one NTF1122 was used as a ventilation material. The same oil repellent treatment as in Example 1 was performed, and the air flow rate was measured before and after the oil repellent treatment. The ventilation rate of the breathable material not subjected to the oil-repellent treatment was 21 seconds / 100 ml, and the ventilation rate of the breathable material subjected to the oil-repellent treatment was 60 seconds / 100 ml.

（比較例２）
上層部材にＮＴＦ１１２５を、下層部材にＮＴＦ１１３１を用い、実施例１と同様の方法で、撥油処理していないブランクの通気材、および上層部材のみ撥油処理した比較例２の通気材を作製した。ブランクの通気材の通気量は、１５秒／１００ｍｌであり、比較例２の通気材の通気量は、６０秒／１００ｍｌであった。 (Comparative Example 2)
Using an NTF1125 for the upper layer member and NTF1131 for the lower layer member, a blank ventilation material not subjected to oil repellent treatment and a vent material of Comparative Example 2 in which only the upper layer member was subjected to oil repellent treatment were produced in the same manner as in Example 1. . The ventilation rate of the blank ventilation material was 15 seconds / 100 ml, and the ventilation rate of the ventilation material of Comparative Example 2 was 60 seconds / 100 ml.

（比較例３）
上層部材にＮＴＦ１０２６を、下層部材にＮＴＦ１１３１を用い、実施例１と同様の方法で、撥油処理していないブランクの通気材、および上層部材のみ撥油処理した比較例３の通気材を作製した。ブランクの通気材の通気量は、１３秒／１００ｍｌであり、比較例３の通気材の通気量は、３０秒／１００ｍｌであった。 (Comparative Example 3)
Using an NTF1026 for the upper layer member and NTF1131 for the lower layer member, a blank ventilation material not subjected to oil repellent treatment and a vent material of Comparative Example 3 in which only the upper layer member was subjected to oil repellent treatment were produced in the same manner as in Example 1. . The ventilation rate of the blank ventilation material was 13 seconds / 100 ml, and the ventilation rate of the ventilation material of Comparative Example 3 was 30 seconds / 100 ml.

以上の結果を表２にまとめる。表２より明らかなように、撥油処理を施す上層部材に平均孔径がより大きいＰＴＦＥ多孔質膜を用いた場合には、撥油後の通気量の低下を小さく抑えることが可能となる。また、各実施例の通気材は、上層部材に撥油処理が施されているために、撥油性が良好である。さらに、下層部材に、平均孔径が小さいＰＴＦＥ多孔質膜を用いているので、耐水性も良好である。   The above results are summarized in Table 2. As is apparent from Table 2, when a PTFE porous membrane having a larger average pore diameter is used for the upper layer member subjected to the oil repellent treatment, it is possible to suppress a decrease in the air flow rate after the oil repellent. In addition, the air-permeable material of each example has good oil repellency because the upper layer member is subjected to oil repellency treatment. Furthermore, since a PTFE porous membrane having a small average pore diameter is used for the lower layer member, the water resistance is also good.

Figure 2008136908
Figure 2008136908

本発明の通気材は、自動車部品、家電製品、情報機器等の筐体に好適に用いることができる。   The air-permeable material of the present invention can be suitably used for housings such as automobile parts, home appliances, and information equipment.

本発明の、２枚のＰＴＦＥ多孔質膜を用いた通気材の一例の断面図である。It is sectional drawing of an example of the ventilation material using two PTFE porous membranes of this invention. 本発明の、２枚のＰＴＦＥ多孔質膜および支持体を用いた通気材の一例の断面図である。It is sectional drawing of an example of the ventilation material using two PTFE porous membranes and a support body of this invention.

符号の説明Explanation of symbols

１ 上層側撥油処理済ＰＴＦＥ多孔質膜（平均孔径が大きい方のＰＴＦＥ多孔質膜）
２ 下層側非撥油処理ＰＴＦＥ多孔質膜（平均孔径が小さい方のＰＴＦＥ多孔質膜）
３ 支持体 1 Upper layer side oil-repellent treated PTFE porous membrane (PTFE porous membrane with larger average pore diameter)
2 Lower layer side non-oil-repellent treated PTFE porous membrane (PTFE porous membrane with smaller average pore diameter)
3 Support

Claims (3)

平均孔径の異なる２枚のポリテトラフルオロエチレン多孔質膜を含み、前記２枚のポリテトラフルオロエチレン多孔質膜のうち、平均孔径が大きい方のポリテトラフルオロエチレン多孔質膜のみに撥油処理が施されている撥油性通気材。   Oil-repellent treatment is performed only on the polytetrafluoroethylene porous membrane having the larger average pore diameter among the two polytetrafluoroethylene porous membranes, including two polytetrafluoroethylene porous membranes having different average pore sizes. Oil repellent breathable material. 前記平均孔径が大きい方のポリテトラフルオロエチレン多孔質膜の平均孔径が、１．０μｍ以上である請求項１に記載の通気材。   The ventilation material according to claim 1, wherein an average pore diameter of the polytetrafluoroethylene porous membrane having the larger average pore diameter is 1.0 µm or more. 前記２枚のポリテトラフルオロエチレン多孔質膜のうち、平均孔径が小さい方のポリテトラフルオロエチレン多孔質膜の平均孔径が、１．０μｍ未満である請求項１または２に記載の通気材。   The ventilation material according to claim 1 or 2, wherein the average pore size of the polytetrafluoroethylene porous membrane having the smaller average pore size among the two polytetrafluoroethylene porous membranes is less than 1.0 µm.
JP2006323803A 2006-11-30 2006-11-30 Water-repellent air-permeable material Pending JP2008136908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006323803A JP2008136908A (en) 2006-11-30 2006-11-30 Water-repellent air-permeable material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006323803A JP2008136908A (en) 2006-11-30 2006-11-30 Water-repellent air-permeable material

Publications (1)

Publication Number Publication Date
JP2008136908A true JP2008136908A (en) 2008-06-19

Family

ID=39598930

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006323803A Pending JP2008136908A (en) 2006-11-30 2006-11-30 Water-repellent air-permeable material

Country Status (1)

Country Link
JP (1) JP2008136908A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009137181A (en) * 2007-12-07 2009-06-25 Nitto Denko Corp Polytetrafluoroethylene porous film, manufacturing method of the same, and waterproof breathable filter
JP2012130885A (en) * 2010-12-22 2012-07-12 Asahi Glass Co Ltd Oil-repellent waterproof air-permeable filter and method for producing the same
JP2015509681A (en) * 2012-12-11 2015-03-30 アモグリーンテック カンパニー リミテッド Waterproof sound-permeable sheet and manufacturing method thereof
WO2015064380A1 (en) * 2013-10-29 2015-05-07 学校法人北里研究所 Tool for vitrifying cryopreservation of cells or tissue
WO2017038105A1 (en) * 2015-09-04 2017-03-09 日東電工株式会社 Method for cleaning portable electronic device, and method for inspecting and method for manufacturing film for functioning as waterproof ventilation film and/or waterproof sound-transmitting film

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009137181A (en) * 2007-12-07 2009-06-25 Nitto Denko Corp Polytetrafluoroethylene porous film, manufacturing method of the same, and waterproof breathable filter
JP2012130885A (en) * 2010-12-22 2012-07-12 Asahi Glass Co Ltd Oil-repellent waterproof air-permeable filter and method for producing the same
JP2015509681A (en) * 2012-12-11 2015-03-30 アモグリーンテック カンパニー リミテッド Waterproof sound-permeable sheet and manufacturing method thereof
WO2015064380A1 (en) * 2013-10-29 2015-05-07 学校法人北里研究所 Tool for vitrifying cryopreservation of cells or tissue
US10412958B2 (en) 2013-10-29 2019-09-17 School Juridical Person Kitasato Institute Device for cell or tissue cryopreservation by vitrification
WO2017038105A1 (en) * 2015-09-04 2017-03-09 日東電工株式会社 Method for cleaning portable electronic device, and method for inspecting and method for manufacturing film for functioning as waterproof ventilation film and/or waterproof sound-transmitting film

Similar Documents

Publication Publication Date Title
JP4680220B2 (en) Waterproof ventilation filter, waterproof ventilation member and housing
JP5866228B2 (en) Breathable filter with oil repellency
KR102241666B1 (en) Waterproof breathable filter and use thereof
KR101967934B1 (en) Waterproof air-permeable filter and uses thereof
JP6246481B2 (en) Breathable filter with adhesive layer with oil repellency
KR102021855B1 (en) Composite Membrane and Method of Making Composite Membrane
CN111065772B (en) Waterproof and breathable sheet and manufacturing method thereof
JP2008136908A (en) Water-repellent air-permeable material
TW201236741A (en) Oil-repellent waterproof air-permeable filter and method for producing same
US20120052266A1 (en) Oleophobic Membrane Including A Printed Patterned Layer of Particles and Method
WO2013150781A1 (en) Breathable sheet imparted with oil repellent properties
JP6037643B2 (en) Breathable film with oil repellency
JP2012057795A (en) Breathable gasket
JP2005169167A (en) Air filter filtering medium
KR102281760B1 (en) Porous fluorine resin composite membrane and method for prepararing the same
KR20200096953A (en) Internal pressure adjustment member and electronic parts for transport equipment
JP2005074855A (en) Moisture-permeable, water-proof composite film and moisture-permeable, water-proof composite sheet using the film
CN215040842U (en) Composite membrane based on PTFE porous membrane
JP2024063946A (en) Composite Membrane
KR20200088589A (en) Breathable Waterproof Sheet and articles comprising the same
JP2001197589A (en) Speaker edge and its manufacturing method