JPH0474516A - Method for making hydrophobic porous membrane hydrophilic - Google Patents
Method for making hydrophobic porous membrane hydrophilicInfo
- Publication number
- JPH0474516A JPH0474516A JP18866890A JP18866890A JPH0474516A JP H0474516 A JPH0474516 A JP H0474516A JP 18866890 A JP18866890 A JP 18866890A JP 18866890 A JP18866890 A JP 18866890A JP H0474516 A JPH0474516 A JP H0474516A
- Authority
- JP
- Japan
- Prior art keywords
- ethanol
- membrane
- porous membrane
- hydrophilic
- hydrophobic porous
- 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
- 239000012528 membrane Substances 0.000 title claims abstract description 45
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 43
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000011187 glycerol Nutrition 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 2
- 238000007598 dipping method Methods 0.000 abstract 3
- -1 polytetrafluoroethylene Polymers 0.000 description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 101000744152 Naja oxiana Cytotoxin 2 Proteins 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
童粟上■肌朋分立
本発明は、疎水性多孔質膜、特に、多孔質ポリテトラフ
ルオロエチレン膜の親水化方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making a hydrophobic porous membrane, particularly a porous polytetrafluoroethylene membrane, hydrophilic.
従来ｑ技街
分離や濾過プロセスにおいて種々の多孔質膜が用いられ
ているが、なかでもポリテトラフルオロエチレンからな
る多孔質精密濾過膜は、耐薬品性、熱的特性、生物化学
的耐久性等にすぐれるところから、種々の工業分野にお
いて広く用いられている。Various porous membranes have been used in conventional separation and filtration processes, but among them, porous microfiltration membranes made of polytetrafluoroethylene have excellent chemical resistance, thermal properties, biochemical durability, etc. Due to its excellent properties, it is widely used in various industrial fields.
しかし、多孔質ポリテトラフルオロエチレン膜は、非常
に疎水性が強いために、そのままでは表面張力の高い液
体、特に水溶液を濾過することができない。そこで、従
来、多孔質ポリテトラフルオロエチレン膜にて水性液体
を濾過しようとするときは、その膜を予めアルコール等
の親水性有機溶剤で処理し、膜中の微細孔に含浸させた
後、この有機溶剤を水で置換することが行なわれている
。However, porous polytetrafluoroethylene membranes are extremely hydrophobic and cannot filter liquids with high surface tension, especially aqueous solutions, as they are. Conventionally, when attempting to filter aqueous liquids using a porous polytetrafluoroethylene membrane, the membrane is previously treated with a hydrophilic organic solvent such as alcohol to impregnate the micropores in the membrane. Replacement of organic solvents with water has been practiced.
しかし、このような方法によって、多孔質ポリテトラフ
ルオロエチレン膜を一旦、親水化しても、この膜をモジ
ュールに組み込むときに、上記アルコール等の親水性有
機溶剤が膜中の微細孔から漏出すれば、膜は、再び、当
初の疎水性に戻るので、水性液体の処理に用いることが
できない。However, even if a porous polytetrafluoroethylene membrane is once made hydrophilic by such a method, when the membrane is assembled into a module, if the hydrophilic organic solvent such as the alcohol leaks out from the fine pores in the membrane. , the membrane reverts back to its original hydrophobicity and cannot be used to treat aqueous liquids.
また、ポリテトラフルオロエチレン膜に何ら親水化処理
を行なわずにモジュールに組み込んだ後に、ポンプにて
アルコール等の溶剤を膜に循環させて、親水化すること
もできる。しかし、かかる方法によれば、多量の溶剤を
必要とするうえに、ポンプや周辺環境の防爆化を考慮し
た設備コストや作業スペースが必要である。Alternatively, after the polytetrafluoroethylene membrane is incorporated into a module without any hydrophilization treatment, a solvent such as alcohol may be circulated through the membrane using a pump to make it hydrophilic. However, such a method requires a large amount of solvent, and also requires equipment costs and work space in consideration of explosion-proofing of the pump and surrounding environment.
が ゛ しようとする課題
本発明者らは、疎水性多孔質膜、特に、ポリテトラフル
オロエチレン膜の親水化方法における上記した問題を解
決するために鋭意研究した結果、疎水性多孔質膜をエタ
ノールに浸漬し、親水化処理した後、グリセリンの水溶
液に浸漬し、エタノールと置換することによって、親水
化状態を半永久的に保持すると共に、エタノールで親水
化処理した直後とほぼ同じ程度の透水速度を有する親水
化膜を得ることができることを見出して、本発明に至っ
たものである。The present inventors have conducted extensive research to solve the above-mentioned problems in the method of making hydrophobic porous membranes, particularly polytetrafluoroethylene membranes, hydrophilic. By immersing it in an aqueous solution of glycerin and replacing it with ethanol, the hydrophilic state can be maintained semi-permanently, and the water permeation rate can be almost the same as that immediately after the hydrophilic treatment with ethanol. The present invention was achieved by discovering that it is possible to obtain a hydrophilized membrane having the following properties.
量 を”するための
本発明による疎水性多孔質膜の親水化方法は、疎水性多
孔質膜をエタノールに浸漬した後、グリセリンの水溶液
にて処理することを特徴とする。The method for hydrophilizing a hydrophobic porous membrane according to the present invention for increasing the amount of water is characterized by immersing the hydrophobic porous membrane in ethanol and then treating it with an aqueous solution of glycerin.
本発明において、疎水性多孔質膜は、平均孔径０．０１
〜１００μｍ、好ましくは０．１〜１０．ｃｚｍ。In the present invention, the hydrophobic porous membrane has an average pore diameter of 0.01
~100 μm, preferably 0.1-10. czm.
膜厚１００〜５００μｍ、好ましくは５０〜２００μｍ
、多孔度１〜９０％、好ましくは１０〜７０％の範囲に
あり、特に、ポリテトラフルオロエチレン多孔質膜が好
ましい。Film thickness 100-500 μm, preferably 50-200 μm
The porosity is in the range of 1 to 90%, preferably 10 to 70%, and polytetrafluoroethylene porous membranes are particularly preferred.
本発明の方法においては、先ず、このような疎水性多孔
質膜をエタノールに浸漬し、多孔質膜の有する微細孔に
エタノールを含浸させる。用いるエタノールは、９０重
量％以上の水溶液でもよい。In the method of the present invention, such a hydrophobic porous membrane is first immersed in ethanol to impregnate the micropores of the porous membrane with ethanol. The ethanol used may be a 90% by weight or more aqueous solution.
浸漬時間は、膜中の微細孔がエタノールによって含浸さ
れる時間であれば、特に限定されるものではないが、通
常、５〜３０秒間の範囲で十分である。The immersion time is not particularly limited as long as the micropores in the membrane are impregnated with ethanol, but a range of 5 to 30 seconds is usually sufficient.
次いで、本発明の方法によれば、このようにエタノール
を含浸させた多孔質膜をグリセリン水溶液に浸漬し、エ
タノールと置換させる。水溶液の濃度は２０〜４０重量
％の範囲が好適である。Next, according to the method of the present invention, the porous membrane thus impregnated with ethanol is immersed in an aqueous glycerin solution to replace the ethanol. The concentration of the aqueous solution is preferably in the range of 20 to 40% by weight.
多孔質膜のグリセリン水溶液への浸漬時間も、前記エタ
ノールがこれら水溶液によって実質的に置換されるに足
る時間であれば、特に限定されるものではないが、通常
、１〜ＩＯ時間の範囲で十分である。The immersion time of the porous membrane in the glycerin aqueous solution is not particularly limited as long as it is long enough for the ethanol to be substantially replaced by the aqueous solution, but a range of 1 to IO hours is usually sufficient. It is.
このように処理された多孔質膜は、親水性を有すること
は勿論、上記グリセリン水溶液が膜から漏出することが
防止され、モジュールに組み込む際にも、その親水性が
保持される。The porous membrane treated in this way not only has hydrophilic properties, but also prevents the aqueous glycerin solution from leaking out of the membrane, and maintains its hydrophilic properties even when incorporated into a module.
本発明において、モジュールの形状は、例えば、プレー
ト及びフレーム型、チューブラ−型、スパイラル型等で
あってよいが、これらに限定されるものではない。In the present invention, the shape of the module may be, for example, a plate and frame type, a tubular type, a spiral type, etc., but is not limited thereto.
主班例力果
このように、本発明の方法によれば、処理した疎水性多
孔質膜は、親水化状態を半永久的に保持すると共に、エ
タノールで親水化処理した直後とほぼ同じ程度の透水速
度を有する親水化膜を得ることができる。As described above, according to the method of the present invention, the treated hydrophobic porous membrane maintains its hydrophilic state semi-permanently, and has almost the same level of water permeability as immediately after being hydrophilized with ethanol. It is possible to obtain a hydrophilized membrane with high speed.
実巖拠
以下に実施例を挙げて本発明を説明するが、本発明はこ
れら実施例により何ら限定されるものではない。EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples in any way.
平均孔径０．２μｍの微細孔を有する多孔質ポリテトラ
フルオロエチレン膜を９９％エタノールに約１０秒間浸
漬した後、３０重量％のグリセリン水溶液に膜を約６時
間浸漬した。A porous polytetrafluoroethylene membrane having micropores with an average pore diameter of 0.2 μm was immersed in 99% ethanol for about 10 seconds, and then the membrane was immersed in a 30% by weight aqueous glycerin solution for about 6 hours.
グリセリン水溶液から取り出した後、大気中に膜を約１
か月装置し、これをプレート及びフレーム型モジュール
に組み込み、膜装置を製作した。After removing the film from the glycerin aqueous solution, about 1
A membrane device was manufactured by incorporating this into a plate and frame type module.
この膜装置において、透水速度は平均圧力０．４ ｋｇ
／ ｃｆの下に２．０８ｒｒｆ／ｎ（・時であった。In this membrane device, the water permeation rate is at an average pressure of 0.4 kg
/cf was 2.08rrf/n (・hr).
他方、上記多孔質ポリテトラフルオロエチレン膜を疎水
性のまま、モジュールに組み込み、ポンプで９９％エタ
ノールを１５分間、循環させた。On the other hand, the porous polytetrafluoroethylene membrane was assembled into a module while remaining hydrophobic, and 99% ethanol was circulated using a pump for 15 minutes.
このようにして親水化した膜の透水速度は、平均圧力０
．４ ｋｇ ／ ＣＴＩＩの下に１．８０ｒ１′？／ｍ
ｌ・時であった。The water permeation rate of the membrane made hydrophilic in this way is the average pressure of 0
．． 4 kg/1.80r1′ under CTII? /m
It was l.
Claims (1)
セリンの水溶液にて処理することを特徴とする疎水性多
孔質膜の親水化方法。(1) A method for making a hydrophobic porous membrane hydrophilic, which comprises immersing the hydrophobic porous membrane in ethanol and then treating it with an aqueous solution of glycerin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18866890A JPH0474516A (en) | 1990-07-16 | 1990-07-16 | Method for making hydrophobic porous membrane hydrophilic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18866890A JPH0474516A (en) | 1990-07-16 | 1990-07-16 | Method for making hydrophobic porous membrane hydrophilic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0474516A true JPH0474516A (en) | 1992-03-09 |
Family
ID=16227765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18866890A Pending JPH0474516A (en) | 1990-07-16 | 1990-07-16 | Method for making hydrophobic porous membrane hydrophilic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0474516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008221180A (en) * | 2007-03-15 | 2008-09-25 | Nitta Ind Corp | Sealing structure of air filter |
-
1990
- 1990-07-16 JP JP18866890A patent/JPH0474516A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008221180A (en) * | 2007-03-15 | 2008-09-25 | Nitta Ind Corp | Sealing structure of air filter |
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