JP5037087B2 - 多孔質ptfe層の形成方法、ならびにこの形成方法により得られる多孔質ptfe層および成型品 - Google Patents
多孔質ptfe層の形成方法、ならびにこの形成方法により得られる多孔質ptfe層および成型品 Download PDFInfo
- Publication number
- JP5037087B2 JP5037087B2 JP2006295753A JP2006295753A JP5037087B2 JP 5037087 B2 JP5037087 B2 JP 5037087B2 JP 2006295753 A JP2006295753 A JP 2006295753A JP 2006295753 A JP2006295753 A JP 2006295753A JP 5037087 B2 JP5037087 B2 JP 5037087B2
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- Prior art keywords
- support
- ptfe
- porous ptfe
- film
- porous
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
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- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4329—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms the joint lines being transversal but non-orthogonal with respect to the axis of said tubular articles, i.e. being oblique
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/45—Joining of substantially the whole surface of the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/49—Internally supporting the, e.g. tubular, article during joining
- B29C66/496—Internally supporting the, e.g. tubular, article during joining using a support which remains in the joined object
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
- B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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- B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B29C66/90—Measuring or controlling the joining process
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- B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
- B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
- B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
- B29C66/91935—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined lower than said fusion temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C53/36—Bending and joining, e.g. for making hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29K2995/0037—Other properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Plasma & Fusion (AREA)
- Laminated Bodies (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
例えば、特許文献4には、熱可塑性樹脂チューブ(内層)の外周面に焼成または未焼成多孔質PTFE層(外層)を積層接着させた構造を有する複合チューブが開示されているが、層間接着の方法としては、加熱(好ましくはPTFEの融点以上)により内層と外層を一体的に熱融着させる方法や、内層と外層との間に接着剤層を介在させる方法が用いられている[0013]。
ィングした後、高温で加熱することにより、延伸膨張PTFE膜の上に延伸膨張を行っていない焼成多孔質PTFEの層が形成された多孔質複合材料を製造する方法が記載されている。より具体的には、軟鋼板に延伸膨張PTFE膜を巻いて覆い、これに未焼成PTFE粒子の分散液をスプレーコーティングした後、100℃で2時間、次いで280℃で0.5時間、最後に350℃で2時間加熱する製造方法が、実施例1に記載されている。
(1)1枚または2枚以上の未焼成多孔質ポリテトラフルオロエチレン(PTFE)フィルムと下記工程(2)における加熱条件に耐えうる支持体とを所定の方法で組み合わせる工程、および
(2)上記工程(1)の結果物を所定の条件で加熱する工程を有することを特徴とする。
1番目の態様は、支持体が板状である場合に、当該板状の支持体の片面に上記1枚または2枚以上の未焼成多孔質PTFEフィルムを積載し、当該PTFEフィルムの周縁の幅
1cm以上にわたる部分を当該支持体の裏側に回り込ませることにより、当該PTFEフィルムと板状の支持体とを組み合わせる工程である。
5番目の態様は、支持体が棒状である場合に、上記1枚または2枚以上の未焼成多孔質PTFEフィルムを当該棒状の支持体に巻き付けた後、当該PTFEフィルムおよび棒状の支持体を、熱可塑性樹脂繊維で縫い付けるか、またはバインダー樹脂で接着することにより、当該PTFEフィルムと板状の支持体とを組み合わせる工程である。
上述のような多孔質PTFE層の形成方法により、シワや変形がなく、未焼成多孔質PTFEフィルム同士が融着して固定化された(さらには所定の気体透過量等の好ましい物性を有する)多孔質PTFE層や、支持体と該支持体表面に形成されたそのような多孔質PTFE層とからなる成型品が得られる。
また、「多孔質PTFE層」は、1枚または2枚以上の未焼成多孔質PTFEフィルムからなる層を指し、本発明の所定の工程に従って処理することにより、これらのPTFEフィルム同士は「融着」した状態になる。本発明においてPTFEフィルムが「融着する」とは、未焼成PTFEを融点未満の温度で加熱することにより、PTFEフィルム同士が固定化され、実用上問題ない程度に剥離しなくなることであり、従来の、未焼成PTFEの融点以上の温度での加熱による、いわゆる溶融一体化とは区別された状態を意味する。
<未焼成多孔質PTFEフィルム>
本発明で用いる未焼成多孔質PTFEフィルムは特に限定されるものではなく、膜厚、孔形状、気孔率等の性状は適宜選択することが可能であり、各種延伸法により延伸されたものでもよい。未焼成多孔質PTFEフィルムは、一般的には、膜厚は30〜100μm程度であり、細孔直径は0.05〜30μm程度であり、気孔率は20〜95%程度であ
る。所定の性状を有する未焼成多孔質PTFEフィルムは、公知の方法により調製することが可能であり、商品として入手することも可能である。
本発明で用いる支持体は、本発明の形成方法の加熱工程(2)においてPTFEフィルムが収縮する際にシワや変形が起きないようにする役割を果たすと共に、支持体と多孔質PTFE層とからなる成型品に所定の物性や機能をもたらすものである。より詳細には、流体・固体が透過可能な孔・空隙を有し、金属・有機化合物・無機化合物のいずれかまたはこれらの複合物から構成され、使用条件に合う任意形状からなる支持体であるが、その材質や形状などの態様は、成型品の用途等に応じて適宜選択することができる。
おける好ましい支持体といえる。
本発明による積層多孔質フィルムの形成方法は、少なくとも、以下に述べるような工程(1)および工程(2)を有するが、所望によりその他の工程を組み合わせて行うことも可能である。
本発明の積層PTFE多孔質フィルムの形成方法では、まず、1枚または2枚以上の未焼成PTFEフィルムと支持体上とを所定の方法で組み合わせる工程が行われる。この工程は、主として、工程(2)の加熱の際にPTFEフィルムのスベリ(シワ発生の原因となる)を抑制することを目的として行われる工程である。かかる工程(1)としては、典型的には以下の5つの態様が挙げられる。1〜3番目は支持体が板状である場合について、4〜5番目は支持体が棒状である場合についてのものである。
体の片面に積載する、ii)ロ字型の金型を上記PTFEフィルムの上に設置する、iii)
「支持体/PTFEフィルム/金型」がずれないよう、さらに周部にガイドを設けてもよい、iv)「支持体/PTFEフィルム/金型」一体物の上下に金属板を設ける、v)上記ivで設けた金属板を、例えばC型クランプで締め付ける、という手段を採用することがで
きる(図2参照)。C型クランプ等締め付ける際の圧力は、通常0.01〜2.0kg/cm2であり、例えばFEPディスパージョンの融着補助とする(下記3番目の態様との組
み合わせ、詳細は後述)場合などには0.5〜2.0kg/cm2が好ましい。なお、この
2番目の態様を採用する場合は、装置、器具等を用いてPTFEフィルムと支持体との一部を圧着させたままの状態で、工程(2)における加熱処理を行う。
した後、当該PTFEフィルムおよび板状の支持体を、前述の「仮接着」で用いる手段と同様に、熱可塑性樹脂(好ましくは「ネオフロンTMEFEP」、FEP、PFA)からなる繊維で縫い付けるか、または、バインダー樹脂(好ましくはFEPまたはPFAを含有するもの)で接着するものである(図3参照)。このようにして、PTFEフィルム同士だけでなく板状の支持体とも固定化することによって、工程(2)でのスベリを抑制することが可能である。
さらに、本発明において、上記1,2,3番目の態様で示した手段を併用することはより好ましい。例えば、上記1番目および2番目の態様の手段を併用し、PTFEフィルムの周縁部を板状の支持体の裏側に回り込ませた上で、支持体のPTFEフィルムを積載した面の縁を圧着させると、より確実にスベリを防止しシワを抑制することが可能となる。
続いて、上記工程(1)の結果物(所定の方法により組み合わされた支持体および1枚または2枚以上のPTFEフィルム)を所定の温度で加熱する工程が行われる。この工程(2)による加熱は、PTFEフィルムを融着させると共に、PTFEフィルムの孔を調節する(ヒートセット)役割を果たす。
上で加熱すると収縮し、融着に寄与すると考えるが、加熱温度が低いと仮接着させた仮接着フィルム同士、あるいはPTFEフィルムと支持体との融着が弱くなる場合もあるので、加熱温度の下限に留意し、適切に調整する必要がある。
本発明では、上記工程(1)および(2)以外に、その他の工程を適宜設けることが可能である。
上述のような本発明の多孔質PTFE層の形成方法を用いることにより、板状または棒状の支持体上に1枚または2枚以上のPTFEフィルムからなる多孔質PTFE層を形成することができるとともに、そのような支持体と多孔質PTFE層とからなる成型品が得られる。
1枚の二軸延伸多孔質PTFEフィルム(YMT社製、サンプル品。厚さ30μm、寸法16cm×16cm。)をSUS板(厚さ1.5mm)の片面(表)に載せ、このPT
FEフィルムの四方の周縁部をSUS板の裏に折り返した後、表を上側にして電気炉にて250℃で1時間の熱処理を行った。熱処理後、多孔質PTFE層をSUS板から一旦分離して直径約23mmの円形に打ち抜き、別途同じ寸法に加工したSUSメッシュ板(厚さ250μm、周囲のみドーナツ状に非メッシュ部がある)と重ね合わせて成型品とした。上記の熱処理後のPTFEフィルムの表面にシワは形成されなかった。
実施例1に記載の方法において、二軸延伸多孔質PTFEフィルムの枚数を1枚から3枚に変更し、それ以外は同様にして成形品を得た。実施例1と同様、熱処理後のPTFEフィルムの表面にシワは形成されなかった。
実施例1に記載の方法において、二軸延伸多孔質PTFEフィルムの枚数を1枚から5枚に変更し、それ以外は同様にして成形品を得た。実施例1と同様、熱処理後のPTFEフィルムの表面にシワは形成されなかった。
1枚の二軸延伸多孔質PTFEフィルムをガラス製不織布(厚さ300μm、寸法15cm×15cm)の片面(表)に積載し、このPTFEフィルムの四方の周縁部1cmをガラス製不織布の裏に折り返した後、電気炉にて150℃で1時間の熱処理を行った。熱処理後、多孔質PTFE層とガラス製不織布を一緒に直径約23mmの円形に打ち抜き、成型品とした。上記の熱処理後のPTFEフィルムの表面にシワは形成されなかった(図6参照)。
実施例4に記載の方法において、二軸延伸多孔質PTFEフィルムの枚数を1枚から3枚に変更し、それ以外は同様にして成形品を得た。実施例4と同様、熱処理後のPTFEフィルムの表面にシワは形成されなかった。
1枚の二軸延伸多孔質PTFEフィルムをSUS棒に掛けて棒の両側に垂らし、加熱に対し自由に収縮できるような状態で電気炉内に設置し、250℃で1時間の熱処理を行った。熱処理後、多孔質PTFE層を直径約23mmの円形に打ち抜き、同じ寸法に打ち抜いたSUSメッシュ板と重ね合わせて成型品とした。上記の熱処理後のPTFEフィルムの表面にはシワが形成されていた(図7参照)。
比較例1に記載の方法において、二軸延伸多孔質PTFEフィルムの枚数を1枚から3枚に変更し、それ以外は同様にして成形品を得た。なお、比較例2により得られた多孔質PTFE層は融着していなかったので、フィルムを打ち抜いた後に重ね合わせたものを成型品に用いた。比較例1と同様、熱処理後のPTFEフィルムの表面にはシワが形成されていた。
実施例1〜5および比較例1〜2により得られた成形品を用いて、CO2の透過量を測
定した。結果は表1の通りである。
実施例5により得られた多孔質PTFE層を単独で直径約23mmの円形に打ち抜き、同じ寸法に打ち抜いたSUSメッシュ板と重ね合わせて成型品とし、種々の濃度のメタノール溶液について耐圧限界を評価した。試験は室温下で行い、メタノール溶液をCO2ガ
スにて加圧した。CO2ガスによる一定加圧条件下で、フィルム背面へメタノールが染み
出した圧力を耐圧限界とした。結果は表2の通りである。
1b…支持体(棒状)
2…PTFEフィルム
3…ロ字型金型
4…金属板
5…C字クランプ
6…ロ字型ガイド
10(点線部)…仮接着部分
Claims (9)
- (1)1枚または2枚以上の未焼成多孔質ポリテトラフルオロエチレン(PTFE)フィルムを、下記工程(2)における加熱条件に耐えうる板状の支持体の片面に積載し、当該PTFEフィルムの周縁の幅1cm以上にわたる部分を当該支持体の裏側に回り込ませることにより、当該PTFEフィルムと板状の支持体とを組み合わせる工程、および
(2)上記工程(1)の結果物を150℃以上、PTFEフィルムの融点未満の温度で5〜120分間加熱する工程を有することを特徴とする、多孔質PTFE層の形成方法。 - (1)あらかじめ、熱可塑性樹脂繊維で縫い付けられているか、またはバインダー樹脂で接着されている、2枚以上の未焼成多孔質PTFEフィルムを、下記工程(2)における加熱条件に耐えうる板状の支持体の片面に積載した後、部分的に圧着させることにより、当該PTFEフィルムと板状の支持体とを組み合わせる工程、および
(2)上記工程(1)の結果物を、用いた樹脂繊維またはバインダー樹脂の融点〜320℃の温度で10〜60分間加熱する工程を有することを特徴とする、多孔質PTFE層の形成方法。 - (1)1枚または2枚以上の未焼成多孔質PTFEフィルムを、下記工程(2)における加熱条件に耐えうる板状の支持体の片面に積載した後、当該PTFEフィルムおよび板状の支持体を、熱可塑性樹脂繊維で縫い付けるか、またはバインダー樹脂で接着することにより、当該PTFEフィルムと板状の支持体とを組み合わせる工程、および
前記工程(2)の加熱が、用いた樹脂繊維またはバインダー樹脂の融点〜320℃の温度で10〜60分間なされることを特徴とする、多孔質PTFE層の形成方法。 - (1)あらかじめ、熱可塑性樹脂繊維で縫い付けられているか、またはバインダー樹脂で接着されている、2枚以上の未焼成多孔質PTFEフィルムを、下記工程(2)における加熱条件に耐えうる棒状の支持体にスパイラル状に複数回巻き付けることにより、当該PTFEフィルムと棒状の支持体とを組み合わせる工程、および
(2)上記工程(1)の結果物を、用いた樹脂繊維またはバインダー樹脂の融点〜320℃の温度で10〜60分間加熱する工程を有することを特徴とする、多孔質PTFE層の形成方法。 - (1)1枚または2枚以上の未焼成多孔質PTFEフィルムを、下記工程(2)における加熱条件に耐えうる棒状の支持体に巻き付けた後、当該PTFEフィルムおよび棒状の支持体を、熱可塑性樹脂繊維で縫い付けるか、またはバインダー樹脂で接着することにより、当該PTFEフィルムと棒状の支持体とを組み合わせる工程、および
前記工程(2)の加熱が、用いた樹脂繊維またはバインダー樹脂の融点〜320℃の温度で10〜60分間なされることを特徴とする、多孔質PTFE層の形成方法。 - 前記繊維またはバインダー樹脂が、「ネオフロンTMEFEP」(ダイキン工業(株)製)、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体(FEP)、またはテトラフルオロエチレン−パーフルオロアルコキシエチレン共重合体(PFA)からなる繊維またはFEPまたはPFAを含有するバインダー樹脂であり、
前記工程(2)の加熱が、200〜320℃の温度で10〜60分間なされることを特徴とする、請求項2〜5のいずれかに記載の多孔質PTFE層の形成方法。 - 前記板状または棒状の支持体がメッシュ、不織繊維、組紐または織物からなることを特徴とする、請求項1〜6のいずれかに記載の多孔質PTFE層の形成方法。
- 請求項1〜7のいずれかに記載の方法により得られることを特徴とする多孔質PTFE層。
- 請求項1〜7のいずれかに記載の方法により得られることを特徴とする、支持体と当該支持体表面に形成された多孔質PTFE層とからなる成型品。
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TW96140529A TWI429535B (zh) | 2006-10-31 | 2007-10-29 | 多孔質ptfe層之形成方法,由該形成方法製得之多孔質ptfe層,及其成型品 |
US11/932,446 US7867351B2 (en) | 2006-10-31 | 2007-10-31 | Method for forming porous PTFE layer |
US12/764,131 US8202386B2 (en) | 2006-10-31 | 2010-04-21 | Method for forming porous PTFE layer, and porous PTFE layer and molded product that are obtained by the forming method |
US13/031,273 US8202384B2 (en) | 2006-10-31 | 2011-02-21 | Method for forming porous PTFE layer |
US13/031,271 US8029635B2 (en) | 2006-10-31 | 2011-02-21 | Method for forming porous PTFE layer |
US13/031,274 US8092629B2 (en) | 2006-10-31 | 2011-02-21 | Method for forming porous PTFE layer |
US13/031,275 US8202387B2 (en) | 2006-10-31 | 2011-02-21 | Method for forming porous PTFE layer |
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US20150111114A1 (en) | 2012-04-25 | 2015-04-23 | Hitachi Zosen Corporation | Functional porous material, metal-air battery, and method for manufacturing functional porous material |
US20140231340A1 (en) * | 2013-02-15 | 2014-08-21 | Pall Corporation | Composite including ptfe membrane |
US9605760B2 (en) * | 2013-08-16 | 2017-03-28 | Electro-Motive Diesel, Inc. | Pinion seal for traction motor gear case |
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