JPS6123217B2 - - Google Patents
Info
- Publication number
- JPS6123217B2 JPS6123217B2 JP10884181A JP10884181A JPS6123217B2 JP S6123217 B2 JPS6123217 B2 JP S6123217B2 JP 10884181 A JP10884181 A JP 10884181A JP 10884181 A JP10884181 A JP 10884181A JP S6123217 B2 JPS6123217 B2 JP S6123217B2
- Authority
- JP
- Japan
- Prior art keywords
- exchange membrane
- ion exchange
- cylindrical
- cylindrical body
- membrane
- 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.)
- Expired
Links
- 239000003014 ion exchange membrane Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 description 23
- 238000005341 cation exchange Methods 0.000 description 15
- 239000011521 glass Substances 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000005342 ion exchange Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Description
【発明の詳細な説明】
本発明は、イオン交換膜にフレアーを設ける方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for providing flare in an ion exchange membrane.
イオン交換膜は、各種装置に装着されて、不純
物の吸着、あるいは特定イオンのみを選択的に透
過せしめる分離等に広く応用されている。なかで
も、陽イオン交換膜は、クロルアルカリ電解の隔
膜として近年特に注目されているものである。装
置によつては、イオン交換膜が筒状体として用い
られることが多く、また、装置に装着される際に
筒状開口部にフレアーが設けられていると便利な
ことが多い。例えば、クロルアルカリ電解槽にお
いて電極形状がフインガー状である、いわゆるダ
イヤモンド槽あるいはグラノール槽の場合、これ
ら電極に陽イオン交換膜を装着する場合、陽イオ
ン交換膜の形状は筒状ないし片側開口の袋状であ
ることが必要で、なおかつ、筒状ないし袋状陽イ
オン交換膜の開口部にフレアーが設けられている
と電解槽への装着が便利である。これらの陽イオ
ン交換膜は、通常シート状で作られた陽イオン交
換膜を接合して筒状ないし袋状になされたもので
あるが、これの開口部に、さらにフレアーを接合
することは非常に困難である。 Ion exchange membranes are installed in various devices and are widely used for adsorption of impurities, separation of selectively passing only specific ions, and the like. Among these, cation exchange membranes have attracted particular attention in recent years as diaphragms for chloralkali electrolysis. Depending on the device, the ion exchange membrane is often used as a cylindrical body, and it is often convenient if the cylindrical opening is provided with a flare when installed in the device. For example, in the case of a chlor-alkali electrolytic cell with finger-shaped electrodes, so-called diamond cells or granulol cells, when a cation exchange membrane is attached to these electrodes, the shape of the cation exchange membrane is cylindrical or a bag with an opening on one side. In addition, if the opening of the cylindrical or bag-shaped cation exchange membrane is provided with a flare, it is convenient to attach it to the electrolytic cell. These cation exchange membranes are usually made from sheet-shaped cation exchange membranes joined together to form a cylindrical or bag-like shape, but it is extremely difficult to further join a flare to the opening of this membrane. It is difficult to
本発明等は、筒状ないし袋状陽イオン交換膜に
簡単な加工を施し、極めて簡便にフレアーを設け
ることについて鋭意検討を加えた結果、本発明に
至つたもので、本発明は、筒状イオン交換膜の少
なくとも内面に、該イオン交換膜と接し、かつ、
これより剛性の大きい変形可能な筒状体を配し
て、該イオン交換膜の筒状開口部より加熱された
テーパー付きの押しダイを圧入し、該開口部を外
方に押し広げることを特徴とするイオン交換膜に
フレアーを設ける方法を要旨とするものである。 The present invention was developed as a result of extensive research into the simple processing of cylindrical or bag-shaped cation exchange membranes to extremely easily provide flares. in contact with at least the inner surface of the ion exchange membrane, and
A deformable cylindrical body having greater rigidity than this is arranged, and a heated tapered push die is press-fitted from the cylindrical opening of the ion exchange membrane to push the opening outward. The gist of this paper is a method for providing flares in ion exchange membranes.
本発明に用いられるイオン交換膜としては、カ
ルボン酸基、スルホン酸基、ホスホン酸基等をイ
オン交換基とする炭化水素系膜、含フツ素系炭化
水素膜等が用いられうる。 As the ion exchange membrane used in the present invention, a hydrocarbon membrane having an ion exchange group such as a carboxylic acid group, a sulfonic acid group, or a phosphonic acid group, or a fluorine-containing hydrocarbon membrane can be used.
上記の内で、ハロゲン化アルカリ電解用のイオ
ン交換膜としては、カルボン酸基、スルホン酸
基、ホスホン酸基をイオン交換基とするパーフル
オロフツ化カーボン樹脂膜が好適である。 Among the above, perfluorophylated carbon resin membranes having carboxylic acid groups, sulfonic acid groups, and phosphonic acid groups as ion exchange groups are suitable as ion exchange membranes for halogenated alkali electrolysis.
さらに、本発明に用いられるイオン交換膜とし
ては、上記したよいなイオン交換膜の少なくとも
一方の面に電極として作用しないガス及び液透過
性の多孔質層を設けた加工膜も含むものである。 Furthermore, the ion exchange membrane used in the present invention also includes a processed membrane in which a porous layer permeable to gas and liquid that does not function as an electrode is provided on at least one surface of the above-mentioned ion exchange membrane.
本発明を添付図面をもとに説明する。 The present invention will be explained based on the accompanying drawings.
第１図は、フレアーを設ける前の筒状イオン交
換膜の見取図である。 FIG. 1 is a sketch of a cylindrical ion exchange membrane before providing flares.
第２図は、本発明方法を実施するための装置に
筒状イオン交換膜をセツトした状態の断面説明図
の１例である。 FIG. 2 is an example of a cross-sectional explanatory view of a state in which a cylindrical ion exchange membrane is set in an apparatus for carrying out the method of the present invention.
第１図に示す筒状イオン交換膜１は、シート状
陽イオン交換膜を接合法等により筒状に作製する
ことができる。 The cylindrical ion exchange membrane 1 shown in FIG. 1 can be produced by forming a sheet cation exchange membrane into a cylindrical shape by a bonding method or the like.
第２図において、１は筒状イオン交換膜、２は
筒状イオン交換膜の内面に接して配置された該イ
オン交換膜より剛性の大きい変形可能な筒状体で
ある。３は中子、４は外金型、５は上金型であ
る。上金型５は、さらにその下面に加熱装置を内
蔵したテーパー付きの押しダイ６が設けられてい
る。７は筒状イオン交換膜の外側に設けられた筒
状体２と同質の筒状体である。 In FIG. 2, 1 is a cylindrical ion exchange membrane, and 2 is a deformable cylindrical body that is more rigid than the ion exchange membrane and is placed in contact with the inner surface of the cylindrical ion exchange membrane. 3 is a core, 4 is an outer mold, and 5 is an upper mold. The upper mold 5 is further provided with a tapered push die 6 having a built-in heating device on its lower surface. 7 is a cylindrical body of the same quality as the cylindrical body 2 provided outside the cylindrical ion exchange membrane.
さて、第２図において押しダイをイオン交換膜
が軟化変形しうる程度に加熱して、これを筒状イ
オン交換膜の内面に挿入していくと、該イオン交
換膜の開口先端から順次軟化が起り、押しダイの
テーパー部により外方に押し広げられ変形してい
き、やがて、この押し広げられた部分がフレアー
を構成することになる。 Now, in Fig. 2, when the push die is heated to such an extent that the ion exchange membrane can be softened and deformed, and this is inserted into the inner surface of the cylindrical ion exchange membrane, the ion exchange membrane will gradually soften from the open end. Then, the tapered part of the push die pushes outward and deforms, and eventually, this pushed and spread part forms a flare.
この場合、該イオン交換膜の少なくとも内面に
は、これと接するように該イオン交換膜より剛性
の大きい変形可能な筒状体が配置されていること
が必要である。 In this case, it is necessary that a deformable cylindrical body having greater rigidity than the ion exchange membrane be disposed in contact with at least the inner surface of the ion exchange membrane.
イオン交換膜は通常、数100μの厚さのものが
多く用いられ、これらは自己支持性がなく、ま
た、上記操作の際に、開口上端部から変形する
時、過度の変形、即ち、イオン交換膜の内面が温
度が高いため、より多く伸びてできたフレアーが
円く反つたり、あるいは、波状になつたりする。 Ion exchange membranes are usually several hundred microns thick, and they do not have self-supporting properties, and when deformed from the upper end of the opening during the above operation, excessive deformation occurs, i.e., ion exchange Because the inner surface of the membrane is at a high temperature, it stretches more, causing the flare to curl or become wavy.
このため、筒状イオン交換膜の外側に、変形性
はあるが、イオン交換膜より剛性が大きく、上記
のイオン交換膜の過度の変形を防止することので
きる筒状体を配置することが必要である。 Therefore, it is necessary to place a cylindrical body outside the ion exchange membrane that is deformable but has greater rigidity than the ion exchange membrane and can prevent excessive deformation of the ion exchange membrane. It is.
この筒状体としては材質は、上述の如く、変形
しうるもので、イオン交換膜より剛性の大きなも
のであれば特に限定されることを要しないが、更
に好ましくは、金型との離型性のよいこと、ま
た、イオン交換膜と接着しにくいものであること
が望ましい。このような特性をもつものとして本
発明者等は検討の結果、ガラス繊維織物（ガラス
クロス）にポリテトラフルオロエチレンを含浸さ
せたものが、上述の諸性質を全て備えているもの
として最も好ましいことを見出した。 As mentioned above, the material for this cylindrical body is not particularly limited as long as it is deformable and has greater rigidity than the ion exchange membrane, but more preferably It is desirable that the material has good properties and that it does not easily adhere to the ion exchange membrane. As a result of study by the present inventors as a material having such characteristics, it was found that glass fiber fabric (glass cloth) impregnated with polytetrafluoroethylene is the most preferable material as it has all of the above-mentioned properties. I found out.
更にまた、このような筒状体は筒状イオン交換
膜の外面にも、これと接するように配置するのが
好ましい。内面に配するこの筒状体は中子に対す
る離型剤としての作用もする。 Furthermore, it is preferable that such a cylindrical body be disposed on the outer surface of the cylindrical ion exchange membrane so as to be in contact therewith. This cylindrical body placed on the inner surface also acts as a mold release agent for the core.
この内外２つの筒状体は、好ましくは、内側の
筒状体としては厚みの厚いものを用いるのがよ
い。その理由は、内側筒状体は押しダイの降下力
をイオン交換膜に対する押し広げ力に転換する役
目を有するため、外側筒状体より剛性の大きいこ
とが必要であることによる。 Of these two inner and outer cylindrical bodies, it is preferable to use a thicker inner cylindrical body. The reason for this is that the inner cylindrical body has the role of converting the downward force of the pushing die into a force for pushing and spreading the ion exchange membrane, and therefore needs to have greater rigidity than the outer cylindrical body.
また、フレアーの巾は、大きくすればする程フ
レアーの先端は厚みが薄くなるため、０〜20mm程
度に止めるのがよい。 Furthermore, the width of the flare should be kept at about 0 to 20 mm, since the wider it is, the thinner the tip of the flare becomes.
次に実施例により本発明を詳細に説明する。 Next, the present invention will be explained in detail with reference to Examples.
実施例 １
巾60mm、長さ890mm、高さ800mmの開口部断面
（60mm〜890mm）がほぼ長円形を有する、厚さ280
μの四弗化エチレンとCF2＝CFO
（CF2）3COOCH3の共重合体からなる陽イオン交
換膜筒状体に以下のようにしてフレアーを設け
た。Example 1 An opening with a width of 60 mm, a length of 890 mm, and a height of 800 mm has an approximately oval cross section (60 mm to 890 mm) and a thickness of 280 mm.
μ of tetrafluoroethylene and CF 2 = CFO
A cylindrical cation exchange membrane made of a copolymer of (CF 2 ) 3 COOCH 3 was provided with a flare in the following manner.
上記筒状体陽イオン交換膜の外面に厚さ250μ
のフローグラス（ガラス繊維織物にポリテトラフ
ルオロエチレンを含浸させたもの）、内面に厚さ
350μのフローグラスを陽イオン交換膜と密着さ
せて第２図に示す如く、成形用金型にセツトし、
上金型のテーパー部を200℃に加熱して、筒状開
口部に挿入加圧して、15mmのフレアーのついた陽
イオン交換膜筒状体を成形した。 The outer surface of the cylindrical body cation exchange membrane has a thickness of 250μ
flow glass (woven glass fiber impregnated with polytetrafluoroethylene), with a thickness on the inner surface
A 350μ flow glass was brought into close contact with the cation exchange membrane and set in a mold as shown in Figure 2.
The tapered part of the upper mold was heated to 200°C, and the upper mold was inserted into the cylindrical opening and pressurized to form a cation exchange membrane cylindrical body with a 15 mm flare.
フローグラスの上記開口の両端部に位置する個
所には、上部に深さ20mmの切込みを５〜10mm間隔
で予め設けておいたで、フローグラスはスムース
に広がり、また、金型からの離型及びフローグラ
スと陽イオン交換膜の分離もスムースになすこと
ができた。 Cuts with a depth of 20 mm were made in the upper part of the flow glass at both ends of the above opening at intervals of 5 to 10 mm, so that the flow glass could spread smoothly and could be easily released from the mold. Also, the flow glass and cation exchange membrane could be separated smoothly.
実施例 ２
実施例１の陽イオン交換膜筒状体の代りに以下
のようにして製作された多孔質層を設けた陽イオ
ン交換膜筒状体を用いた。Example 2 In place of the cation exchange membrane cylinder of Example 1, a cation exchange membrane cylinder provided with a porous layer manufactured as follows was used.
２重量％のメチルセルロース水溶液10部の増粘
剤に対して、粒径１μ以下のポリテトラフルオロ
エチレン（以下PTFEと記す）を7.0重量％含む
水分散液2.5部および粒径25μ以下の酸化チタン
粉末５部を混合し、予め充分混合した後、イソプ
ロピルアルコール２部およびシクロヘキサノール
１部を添加し、再混練してペーストを得た。 2.5 parts of an aqueous dispersion containing 7.0% by weight of polytetrafluoroethylene (hereinafter referred to as PTFE) with a particle size of 1μ or less and titanium oxide powder with a particle size of 25μ or less per 10 parts of a 2% by weight aqueous methylcellulose solution as a thickener. After mixing 5 parts thoroughly in advance, 2 parts of isopropyl alcohol and 1 part of cyclohexanol were added and kneaded again to obtain a paste.
該ペーストをメツシユ数200、厚さ60μのステ
ンレス製スクリーンでその下に厚さ８μのスクリ
ーンマスクを施した印刷板およびポリウレタン製
のスキージーを用いて、被印刷基材であるイオン
交換容量が1.43meq／ｇ乾燥樹脂、厚さ210μを
有するポリテトラフルオロエチレンとCF2＝CFO
（CF2）3COOCH3の共重合体からなるイオン交換
膜の一面に800mm×1900mmの大きさにスクリーン
印刷した。 The paste was applied to a printing plate with a mesh count of 200, a 60μ thick stainless steel screen with an 8μ thick screen mask underneath, and a polyurethane squeegee, so that the ion exchange capacity of the printing substrate was 1.43meq. /g dry resin, polytetrafluoroethylene with thickness 210μ and CF 2 =CFO
Screen printing was performed on one side of an ion exchange membrane made of a copolymer of (CF 2 ) 3 COOCH 3 to a size of 800 mm x 1900 mm.
イオン交換膜の一面に得られた印刷層を空気中
に乾燥し、ペーストを固化させた。一方、イオン
交換膜のもう一方の面に全く同様にして、25μ下
の粒径を有する酸化チタンをスクリーン印刷し
た。しかる後、温度140℃、成型圧力30Kg／cm2の
条件で印刷層をイオン膜に圧着後90℃、25重量％
の苛性ソーダ水溶液に浸漬して前記イオン膜を加
水分解すると共にメチルセルロースを溶出せしめ
た。 The resulting printed layer on one side of the ion exchange membrane was dried in air to solidify the paste. Meanwhile, titanium oxide having a particle size of 25 μm or less was screen printed on the other side of the ion exchange membrane in exactly the same manner. After that, the printed layer was pressed onto the ion membrane at a temperature of 140℃ and a molding pressure of 30Kg/ cm2 , and then 90℃ and 25% by weight.
The ionic membrane was immersed in an aqueous solution of caustic soda to hydrolyze it and elute methylcellulose.
該イオン交換膜上に得られた酸化チタン層は厚
さ20μ、多孔率70％を有し、酸化チタンが1.5
mg／cm2含まれていた。 The titanium oxide layer obtained on the ion exchange membrane has a thickness of 20μ and a porosity of 70%, with a titanium oxide layer of 1.5
Contained mg/ cm2 .
これを、800mmの辺同志を接合し、開口部断面
がほぼ60mm×890mm、高さが800mmの筒状体を得
た。 This was joined together on 800 mm sides to obtain a cylindrical body with an opening cross section of approximately 60 mm x 890 mm and a height of 800 mm.
この筒状体を実施例１と同様にしてフレアーを
設けた。 This cylindrical body was provided with a flare in the same manner as in Example 1.
結果は実施例１と同様、金型からの離型及びフ
ローグラスとの分離もスムースにでき、良好なフ
レアー付イオン交換膜筒状体が得られた。 The results were the same as in Example 1, where release from the mold and separation from the flow glass were smooth, and a good flared ion exchange membrane cylinder was obtained.
第１図はフレアーを設けるの筒状イオン交換膜
の見取図である。第２図は本発明方法を実施する
ための装置に筒状イオン交換膜をセツトした状態
の断面説明図である。
FIG. 1 is a sketch of a cylindrical ion exchange membrane provided with flares. FIG. 2 is an explanatory cross-sectional view of a cylindrical ion exchange membrane set in an apparatus for carrying out the method of the present invention.
Claims (1)
ン交換膜と接し、かつ、これより剛性の大きい変
形可能な筒状体を配して、該イオン交換膜の筒状
開口部より加熱されたテーパー付きの押しダイを
圧入し、該開口部を外方に押し広げることを特徴
とするイオン交換膜にフレアーを設ける方法。1. A deformable cylindrical body that is in contact with and has greater rigidity than the ion exchange membrane is disposed on at least the inner surface of the cylindrical ion exchange membrane, and is heated from the cylindrical opening of the ion exchange membrane. A method for providing a flare in an ion exchange membrane, characterized by press-fitting a tapered push die and pushing the opening outward.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10884181A JPS5811791A (en) | 1981-07-14 | 1981-07-14 | Method for providing flare on ion exchange film |
| EP82105932A EP0069940B1 (en) | 1981-07-14 | 1982-07-02 | Electrolytic cell |
| DE8282105932T DE3276010D1 (en) | 1981-07-14 | 1982-07-02 | Electrolytic cell |
| US06/397,177 US4537673A (en) | 1981-07-14 | 1982-07-12 | Electrolytic cell |
| CA000407133A CA1201680A (en) | 1981-07-14 | 1982-07-13 | Electrolytic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10884181A JPS5811791A (en) | 1981-07-14 | 1981-07-14 | Method for providing flare on ion exchange film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5811791A JPS5811791A (en) | 1983-01-22 |
| JPS6123217B2 true JPS6123217B2 (en) | 1986-06-04 |
Family
ID=14494927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10884181A Granted JPS5811791A (en) | 1981-07-14 | 1981-07-14 | Method for providing flare on ion exchange film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5811791A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60186537A (en) * | 1984-03-06 | 1985-09-24 | Toyo Soda Mfg Co Ltd | Tubular amphoteric ion exchange membrane and its production |
-
1981
- 1981-07-14 JP JP10884181A patent/JPS5811791A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5811791A (en) | 1983-01-22 |
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