JPH0276724A - Polytetrafluoroethylene porous material and its manufacture and use - Google Patents
Polytetrafluoroethylene porous material and its manufacture and useInfo
- Publication number
- JPH0276724A JPH0276724A JP23047288A JP23047288A JPH0276724A JP H0276724 A JPH0276724 A JP H0276724A JP 23047288 A JP23047288 A JP 23047288A JP 23047288 A JP23047288 A JP 23047288A JP H0276724 A JPH0276724 A JP H0276724A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- sintered
- semi
- unsintered
- filter
- 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
Links
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 29
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 29
- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 14
- 239000011148 porous material Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000002844 melting Methods 0.000 abstract description 12
- 230000008018 melting Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000007720 emulsion polymerization reaction Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 238000000748 compression moulding Methods 0.000 abstract description 2
- 238000010557 suspension polymerization reaction Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 101000606535 Homo sapiens Receptor-type tyrosine-protein phosphatase epsilon Proteins 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 102100039665 Receptor-type tyrosine-protein phosphatase epsilon Human genes 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1692—Other shaped material, e.g. perforated or porous sheets
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、ポリテトラフルオロエチレン（以下、ｒＰＴ
ＦＥｊという）多孔質体及びその製法と用途に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to polytetrafluoroethylene (hereinafter referred to as rPT)
The present invention relates to a porous body (referred to as FEj) and its manufacturing method and uses.
［従来の技術］
従来の膨張ＰＴＦＥ多孔質体は、ソート又はチューブを
一軸又は二軸に膨張して得られたものであった。[Prior Art] Conventional expanded porous PTFE bodies were obtained by expanding a sort or a tube uniaxially or biaxially.
従来のンート状の膨張ＰＴＦＥ多孔質体をフィルターと
して使用する場合に、フィルター装置へ取り付けるため
のフランジ部分が多孔質で、あまりにも軟質であった。When using a conventional expanded PTFE porous material in the form of a filter, the flange portion for attachment to a filter device was porous and too soft.
したがって、フランジ部分のシールに注意が必要であり
、シートの取り付けが困難であった。Therefore, it was necessary to be careful about sealing the flange portion, making it difficult to attach the seat.
また、ガスセンサーなどにおいては、立体構造のフィル
ターが必要とされている。Furthermore, in gas sensors and the like, filters with three-dimensional structures are required.
［発明が解決しようとする課題］
本発明の目的は、フィルターとして使用でき、装置への
取り付けが容易であり、立体構造を有するＰＴＰＥ多孔
質体を提供することにある。[Problems to be Solved by the Invention] An object of the present invention is to provide a porous PTPE body that can be used as a filter, can be easily attached to a device, and has a three-dimensional structure.
［課題を解決するための手段］
本発明の目的は、未焼結又は半焼結のポリテトラフルオ
ロエチレンシートを立体的に膨張して得られた立体構造
のポリテトラフルオロエチレン多孔質体によって達成さ
れる。[Means for Solving the Problems] The object of the present invention is achieved by a polytetrafluoroethylene porous body having a three-dimensional structure obtained by three-dimensionally expanding an unsintered or semi-sintered polytetrafluoroethylene sheet. Ru.
ＰＴＰＥは、テトラフルオロエチレンのホモポリマーの
みならず、ヘキサフルオロプロピレン、パーフルオロ（
アルキルビニルエーテル）、モノクロロトリフルオロエ
チレンなどの共重合可能なモノマーを１モル％以下で含
有する共重合体をも包含する。PTPE is not only a homopolymer of tetrafluoroethylene, but also hexafluoropropylene, perfluoro(
It also includes copolymers containing 1 mol% or less of copolymerizable monomers such as alkyl vinyl ether) and monochlorotrifluoroethylene.
ＰＴＦＥシートは、グラファイト、コークス、カーホン
、ガラス、ポリイミド、芳香族ポリエステル系樹脂（例
えば、住友化学株式会社製「エコノール」等）、ンリカ
、酸化鉄、酸化チタン、硫酸バリウム、ブロンズなどの
充填材を含有してもよい。PTFE sheets contain fillers such as graphite, coke, carphone, glass, polyimide, aromatic polyester resin (e.g. "Econol" manufactured by Sumitomo Chemical Co., Ltd.), phosphoric acid, iron oxide, titanium oxide, barium sulfate, bronze, etc. May be contained.
ＰＴＦＥシートは以下のようにして製造することができ
る。乳化重合又は＠局重合によって得られたＰＴＦＥ粉
末をペースト押出成形又は圧縮成形して未焼結ＰＴＦＥ
ンートシーる。乳化重合によって得られた水性分散体の
塗膜から未焼結ＰＴＦＥンートシーてもよい。次いで、
未焼結物から成るシートを加熱することにより半焼結物
から成るシートを得ることができる。ＰＴＦＥンートシ
ーカレンダーがけしてらよい。A PTFE sheet can be manufactured as follows. Unsintered PTFE is produced by paste extrusion molding or compression molding of PTFE powder obtained by emulsion polymerization or local polymerization.
See the list. An unsintered PTFE sheet may be formed from a coating of an aqueous dispersion obtained by emulsion polymerization. Then,
A sheet of semi-sintered material can be obtained by heating a sheet of unsintered material. You can use a PTFE sheet calendar.
未焼結物は、比重（みかけ比重）ｈ月 ４〜２，１てあ
り、気孔率が０〜４０％である多孔質体である。The unsintered material is a porous material having a specific gravity (apparent specific gravity) of 4 to 2.1 h and a porosity of 0 to 40%.
半焼結物は、特開昭５９−１５２８２５号公報において
詳細に記載されているように、示差走査熱量計による結
晶融解曲線上で、３４５°Ｃ±５の温度に吸熱カーブを
持ち、未焼結物、半焼結物及び焼結物の融解熱量により
定義される結晶転化率が０．１０〜０８５であり、Ｘ線
回折により測定した結晶化度が８０〜９３％であること
を特徴とする。As described in detail in JP-A No. 59-152825, the semi-sintered material has an endothermic curve at a temperature of 345°C ± 5 on the crystal melting curve measured by differential scanning calorimeter, and is unsintered. The crystal conversion ratio defined by the heat of fusion of the solid, semi-sintered and sintered products is 0.10-085, and the degree of crystallinity measured by X-ray diffraction is 80-93%.
半焼結物は、未焼結物を焼結物の融点以上、好ましくは
焼結物の融点と未焼結物の融点の間の温度で、加熱する
ことにより製造できる。また、未焼結物を未焼結物の融
点よりも高い温度において、非常に短時間、例えば、３
６０°Ｃで２０秒以下加熱することによっても製造でき
る。A semi-sintered product can be produced by heating an unsintered product at a temperature equal to or higher than the melting point of the sintered product, preferably between the melting point of the sintered product and the melting point of the unsintered product. Additionally, the green material may be heated for a very short period of time, e.g.
It can also be produced by heating at 60°C for 20 seconds or less.
ＰＴＦＥンートシーシート面のどの方向に対しても均一
な機械的強度を有することが好ましい。It is preferable that the PTFE sheet has uniform mechanical strength in any direction on its surface.
シート面方向の引張強度は、最も高い引張強度が、最も
小さい引張強度の５倍以下であることが好ましい。５倍
を越えると、膨張時にシートが裂は易い。As for the tensile strength in the sheet surface direction, it is preferable that the highest tensile strength is 5 times or less the lowest tensile strength. If it exceeds 5 times, the sheet is likely to tear during expansion.
ＰＴＦＥソートを立体的に膨張することによって立体構
造のポリテトラフルオロエチレン多孔質体を製造する。A polytetrafluoroethylene porous body with a three-dimensional structure is produced by three-dimensionally expanding PTFE sort.
本明細書において「膨張」とは、延伸をも包含する。In this specification, "expansion" also includes stretching.
膨張は、通常、シートの中央部分全体に行う。Inflation is usually carried out over the entire central portion of the sheet.
しかし、シート面の少なくとも１つ以上の小部分をエン
ボス的に膨張させてもよい。これにより、シート面にエ
ンボス状に多数の多孔質部分を設けることができる。However, at least one or more small portions of the sheet surface may be expanded in an embossed manner. This allows a large number of embossed porous portions to be provided on the sheet surface.
膨張率は、表面積増大率が１００％以上になるようなも
のであることが好ましい。１００％以上でない場合に、
膨張部分全体の均一な多孔性が得られない。The expansion rate is preferably such that the surface area increase rate is 100% or more. If it is not 100% or more,
Uniform porosity throughout the expanded section is not achieved.
膨張温度は、１００℃以上で融点以下、さらに好ましく
は１００〜３２０℃であることが好ましい。融点以上で
は、ノートが破れることがある。The expansion temperature is preferably 100°C or higher and lower than the melting point, more preferably 100 to 320°C. Above the melting point, the notebook may tear.
１００℃以下では、膨張が局部的に生し易い。ノートが
未焼結体である場合に好ましい温度は２００〜３２０°
Ｃである。シートが半焼結体である場合に好ましい温度
は１００〜３２０°Ｃである。At temperatures below 100°C, expansion tends to occur locally. When the notebook is an unsintered body, the preferred temperature is 200 to 320°.
It is C. When the sheet is a semi-sintered body, the preferred temperature is 100 to 320°C.
膨張速度は、特に限定されるものではないが、通常、ソ
ート面に対して垂直方向の速度が０，１〜１ｏｏｏｏ％
／秒である。The expansion speed is not particularly limited, but usually the speed in the direction perpendicular to the sorting surface is 0.1 to 1oooo%.
/second.
シートの膨張していない部分は、未焼結シートの場合に
融点以上で焼結して無孔質にすることが好ましい。半焼
結シートの場合には必ずしも融点以上の焼結を必要とし
ない。In the case of a green sheet, the unexpanded portion of the sheet is preferably sintered at a temperature above the melting point to make it non-porous. In the case of semi-sintered sheets, sintering above the melting point is not necessarily required.
本発明の多孔質体は、立体構造のフィルターとして使用
できる。フィルターは、薬液、溶剤又はガス中の固体又
は液体を分離できる。フィルターの孔の寸法は、通常、
０．０５〜２０ミクロンである。The porous body of the present invention can be used as a three-dimensional filter. Filters can separate solids or liquids in chemical solutions, solvents, or gases. The pore dimensions of the filter are usually
It is 0.05 to 20 microns.
添付図面を参照して本発明を具体的に説明する。The present invention will be specifically described with reference to the accompanying drawings.
第１図は、本発明の多孔質体Ｉの斜視図である。FIG. 1 is a perspective view of a porous body I of the present invention.
第２図は、第１図の多孔質体１の断面図である。FIG. 2 is a sectional view of the porous body 1 shown in FIG.
多孔質体１において部分２は、膨張されていない部分で
あり、未焼結シートの場合に融点以上で加熱することに
よって無孔質となる。部分３は、膨張された部分であり
、多孔質である。この多孔質体は、立体構造のフィルタ
ーとして適している。In the porous body 1, the portion 2 is an unexpanded portion, and in the case of an unsintered sheet, becomes non-porous by heating above the melting point. Part 3 is an expanded part and is porous. This porous body is suitable as a three-dimensional filter.
第３図は、シート膨張用金具２１の側面図及び −シー
ト固定用金具３１の断面図である。円形シー）１１が、
２つのシート固定用金具３１の間に固定されている。FIG. 3 is a side view of the seat inflation fitting 21 and a sectional view of the seat fixing fitting 31. circular sea) 11,
It is fixed between two sheet fixing metal fittings 31.
第４図は、シート１１を膨張している状態を示す断面図
である。シート固定用金具３１に固定されたシート１１
が、シート膨張用金具２■によって膨張されている。FIG. 4 is a sectional view showing a state in which the sheet 11 is expanded. Seat 11 fixed to seat fixing fittings 31
is inflated by the seat inflation fitting 2■.
第５図は、第４図のシートから形成された多孔質体の断
面図である。多孔質体１１は、部分１２、部分１３及び
部分１４を有する。部分１３が膨張された部分であり、
部分１２及び部分１４は膨張されていない部分である。FIG. 5 is a cross-sectional view of a porous body formed from the sheet of FIG. 4. The porous body 11 has a portion 12 , a portion 13 , and a portion 14 . Part 13 is the expanded part,
Portions 12 and 14 are unexpanded portions.
［発明の効果］
本発明のＰＴＦＥ多孔質体をフィルターとして使用する
場合に、フィルターのフィルタ一部分以外の部分、すな
わち、フランツ部分を融点以上の焼結によっであるいは
半焼結体を使用することによって無孔質にすることがで
きる。フランジ部分の機械的強度が高いので、フィルタ
ーの装置への取り付けが容易である。[Effects of the Invention] When the PTFE porous body of the present invention is used as a filter, the part of the filter other than the filter part, that is, the Franz part, is sintered at a temperature higher than the melting point or by using a semi-sintered body. It can be made non-porous. Since the flange portion has high mechanical strength, it is easy to attach the filter to the device.
フィルターの濾過面積を大きくすることができるので、
濾過装置をコンパクトにすることができる。Since the filtration area of the filter can be increased,
The filter device can be made compact.
［実施例］ 以下に、本発明の実施例を示す。[Example] Examples of the present invention are shown below.
実施例１
ＰＴＦＥペースト押出用粉末（ダイキン工業株式会社製
Ｆ−１０４）１００部に押出助剤として炭化水素油（エ
ッソ石油製アイソパーＭ）２４部を加え、ンリンダー内
径１３０ｍｍ、押出金型ダイス内径１２ｍｍの押出機に
より丸棒のペースト押出を行い、これを７０℃に加熱し
たカレンダーロールにより２８ｍ／分の速度でカレンダ
ーがけしてフィルムとし、このフィルムを５０℃トリク
ロロエチレンに浸漬し、押出助剤を抽出除去した後、風
乾して未焼結シートを得た。シートの寸法及び物性を第
１表に示す。Example 1 24 parts of hydrocarbon oil (Isopar M, manufactured by Esso Oil) was added as an extrusion aid to 100 parts of PTFE paste extrusion powder (F-104, manufactured by Daikin Industries, Ltd.), and an extruder was prepared with an inner diameter of 130 mm and an extrusion mold die with an inner diameter of 12 mm. Extrude the paste into a round bar using an extruder, then calender it at a speed of 28 m/min using a calendar roll heated to 70°C to form a film.The film is immersed in trichlorethylene at 50°C to extract the extrusion aid. After removal, it was air-dried to obtain a green sheet. Table 1 shows the dimensions and physical properties of the sheet.
このシートを第３図に示すソート固定用金具３１てはさ
み、２５０℃の炉内に置き、シート温度か２５０℃に達
した後、第３図に示すノート膨張用金具２１を使用して
膨張を行った。第４図に示すようにシートを膨張させた
状態を維持しながら、炉温を３６０℃まで昇温し焼結を
行った後、膨張物を金型より取り出した。This sheet is held between the sorting fixing fittings 31 shown in Fig. 3 and placed in a furnace at 250°C, and after the sheet temperature reaches 250°C, it is expanded using the notebook expansion fitting 21 shown in Fig. 3. went. As shown in FIG. 4, while maintaining the expanded state of the sheet, the furnace temperature was raised to 360° C. to perform sintering, and then the expanded material was taken out from the mold.
第５図に示す立体構造物の多孔質体１１を得た。A porous body 11 having a three-dimensional structure shown in FIG. 5 was obtained.
多孔質体の深さρは２０＋＋＋＋ｎであった。また、Ｄ
、は１０ｍｍ、Ｄｔは３０ｍｍ５Ｉ）＋は５０ｍｍであ
った。多孔質体１１の膨張部１３の寸法及び物性を第２
表に示す。膨張していない部分１２の比重は２．１〜２
．２であった。多孔質体はフィルターとして充分な気孔
率を有していた。The depth ρ of the porous body was 20+++n. Also, D
, was 10 mm, Dt was 30 mm, and 5I)+ was 50 mm. The dimensions and physical properties of the expanded portion 13 of the porous body 11 are
Shown in the table. The specific gravity of the unexpanded portion 12 is 2.1 to 2.
．． It was 2. The porous body had sufficient porosity to serve as a filter.
実施例２
実施例Ｉと同様のソートを用い、実施例１と同様の手順
によって、深さＱが３０ｍｍである多孔質体を得た。多
孔質体の膨張部の寸法及び物性を第２表に示す。多孔質
体はフィルターとして充分の気孔率を有していた。Example 2 A porous body having a depth Q of 30 mm was obtained using the same sorting as in Example I and the same procedure as in Example 1. Table 2 shows the dimensions and physical properties of the expanded portion of the porous body. The porous body had sufficient porosity to serve as a filter.
実施例３
実施例１の未焼結シートを３３５℃で１分間熱処理する
ことによって、第１表に示す寸法及び物性を有する半焼
結シートを得た。なお、この半焼結シートの結晶転化率
は０．７１であった。この半焼結シートを使用し、膨張
後の３６０℃への昇温を行わない以外は実施例１と同様
の手順によって、多孔質体を得た。多孔質体の膨張部の
寸法及び物性を第２表に示す。多孔質体は、フィルター
として充分の気孔率を有していた。Example 3 The unsintered sheet of Example 1 was heat-treated at 335° C. for 1 minute to obtain a semi-sintered sheet having the dimensions and physical properties shown in Table 1. The crystal conversion rate of this semi-sintered sheet was 0.71. Using this semi-sintered sheet, a porous body was obtained in the same manner as in Example 1 except that the temperature was not raised to 360° C. after expansion. Table 2 shows the dimensions and physical properties of the expanded portion of the porous body. The porous body had sufficient porosity to serve as a filter.
第 １ 表
注・ ｌ）強度及び伸びは、ＪＩＳＫ−６３０１にした
がって、ダンベル状３号型で打ち抜いた試料を用いて引
張速度２００ｍｍ／分て測定した。Notes to Table 1 l) Strength and elongation were measured according to JISK-6301 using a sample punched out with a dumbbell type No. 3 at a tensile rate of 200 mm/min.
２）ＤＳＣ吸熱特性は、示差走査熱量計としてパーキン
−エル７ （Ｐ ｅｒｋｉｎ −Ｅ １ｍｅｒ）社製
ＤＳＣ−２型を用い、１０°Ｃ／分の加熱速度で測定し
た。2) DSC endothermic characteristics were measured using a Perkin-E 1mer DSC-2 model as a differential scanning calorimeter at a heating rate of 10°C/min.
第 ２ 表
注、１）気孔増大率−（膨張面比重−膨張後比重）÷膨
張面比重Ｘ １００
２）理論気孔率−（最大比重（２，２）−膨張及比重）
４最大比重×１００
３）表面積増大率−（膨張後表面績−膨張前表面積）÷
膨張面表面積ｘ １００Table 2 Note: 1) Pore increase rate - (Specific gravity on expanded surface - Specific gravity after expansion) ÷ Specific gravity on expanded surface X 100 2) Theoretical porosity - (Maximum specific gravity (2,2) - Expanded and specific gravity)
4 Maximum specific gravity x 100 3) Surface area increase rate - (Surface area after expansion - Surface area before expansion) ÷
Expanded surface area x 100
第１図は本発明の多孔質体の斜視図、
第２図は第１図の多孔質体の断面図、
第３図はシート膨張用金具及びソート固定用金具を示す
図、
第４図はシートの膨張状態を示す断面図、第５図は第４
図のシートから形成された多孔質体を示す断面図、
第６図は未焼結体のＤＳＣ曲線の一例を示す図、及び
第７図は半焼結体のＤＳＣ曲線の一例を示す図である。
１．１１・・・多孔質体。
特許出願人ダイキン工業株式会社Fig. 1 is a perspective view of the porous body of the present invention, Fig. 2 is a sectional view of the porous body of Fig. 1, Fig. 3 is a view showing a sheet expansion fitting and a sorting fixing fitting, and Fig. 4 is A sectional view showing the expanded state of the sheet, FIG.
6 is a cross-sectional view showing a porous body formed from the sheet shown in the figure; FIG. 6 is a diagram showing an example of a DSC curve of an unsintered body; and FIG. 7 is a diagram showing an example of a DSC curve of a semi-sintered body. . 1.11...Porous body. Patent applicant Daikin Industries, Ltd.
Claims (1)
ートを立体的に膨張して得られた立体構造のポリテトラ
フルオロエチレン多孔質体。 ２、未焼結又は半焼結のポリテトラフルオロエチレンシ
ートを立体的に膨張することから成る立体構造のポリテ
トラフルオロエチレン多孔質体の製法。 ３、特許請求の範囲第１項記載のポリテトラフルオロエ
チレン多孔質体から成るフィルター。[Claims] 1. A polytetrafluoroethylene porous body having a three-dimensional structure obtained by three-dimensionally expanding an unsintered or semi-sintered polytetrafluoroethylene sheet. 2. A method for producing a polytetrafluoroethylene porous body having a three-dimensional structure, which comprises three-dimensionally expanding an unsintered or semi-sintered polytetrafluoroethylene sheet. 3. A filter made of the polytetrafluoroethylene porous material according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23047288A JPH0276724A (en) | 1988-09-14 | 1988-09-14 | Polytetrafluoroethylene porous material and its manufacture and use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23047288A JPH0276724A (en) | 1988-09-14 | 1988-09-14 | Polytetrafluoroethylene porous material and its manufacture and use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0276724A true JPH0276724A (en) | 1990-03-16 |
Family
ID=16908356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23047288A Pending JPH0276724A (en) | 1988-09-14 | 1988-09-14 | Polytetrafluoroethylene porous material and its manufacture and use |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0276724A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04323007A (en) * | 1991-04-22 | 1992-11-12 | Japan Gore Tex Inc | Adsorbent |
| JP2011098326A (en) * | 2009-11-09 | 2011-05-19 | Kitagawa Ind Co Ltd | Vent filter and production method for vent filter |
-
1988
- 1988-09-14 JP JP23047288A patent/JPH0276724A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04323007A (en) * | 1991-04-22 | 1992-11-12 | Japan Gore Tex Inc | Adsorbent |
| JP2011098326A (en) * | 2009-11-09 | 2011-05-19 | Kitagawa Ind Co Ltd | Vent filter and production method for vent filter |
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