JPH041653B2 - - Google Patents
Info
- Publication number
- JPH041653B2 JPH041653B2 JP59245606A JP24560684A JPH041653B2 JP H041653 B2 JPH041653 B2 JP H041653B2 JP 59245606 A JP59245606 A JP 59245606A JP 24560684 A JP24560684 A JP 24560684A JP H041653 B2 JPH041653 B2 JP H041653B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- hollow fiber
- wall surface
- ethylene
- vinyl acetate
- 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
- 239000012510 hollow fiber Substances 0.000 claims description 46
- 229920000098 polyolefin Polymers 0.000 claims description 23
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 19
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 34
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 239000012528 membrane Substances 0.000 description 9
- -1 polyethylene Polymers 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 238000007127 saponification reaction Methods 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229940117958 vinyl acetate Drugs 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- BPHHNXJPFPEJOF-UHFFFAOYSA-J chembl296966 Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]S(=O)(=O)C1=CC(S([O-])(=O)=O)=C(N)C2=C(O)C(N=NC3=CC=C(C=C3OC)C=3C=C(C(=CC=3)N=NC=3C(=C4C(N)=C(C=C(C4=CC=3)S([O-])(=O)=O)S([O-])(=O)=O)O)OC)=CC=C21 BPHHNXJPFPEJOF-UHFFFAOYSA-J 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000982 direct dye Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0093—Chemical modification
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Description
【発明の詳細な説明】
［技術分野］
本発明は多孔質ポリオレフイン中空糸の親水化
処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for hydrophilizing porous polyolefin hollow fibers.
［従来の技術］
純水製造や水中のロイド状物の濾過等に用いる
限外濾過膜や精密濾過膜としては種々の膜が知ら
れているが、その１つとしてポリオレフイン膜が
知られている。ポリオレフイン膜は耐薬品性に優
れる、溶融賦形法により膜を製造できる等の利点
から重用されており、本出願人も特公昭56−
52123号、特開昭57−42919号において孔径0.01〜
1μｍの微小空孔が中空糸の内壁面と外壁面との
間を連通する多孔質ポリオレフイン中空糸を提案
した。しかし、これは疎水性の多孔質ポリオレフ
イ中空糸であるので、使用前にアルコール等で一
時的に親水化してそのまま水と置換して用いる
が、使用中に気泡が混入したり、保管時に水を抜
いたりして多孔質ポリオレフイン中空糸表面を空
気と接触させて乾燥すると、濾過性が低下する問
題があり、この様な問題のない親水性多孔質ポリ
オレフイン中空糸の開発が強く要望されていた。[Prior Art] Various membranes are known as ultrafiltration membranes and precision filtration membranes used for pure water production, filtration of roid-like substances in water, etc., and polyolefin membranes are known as one of them. . Polyolefin membranes are widely used due to their excellent chemical resistance and the ability to manufacture membranes by melt-forming.
No. 52123 and JP-A No. 57-42919, the pore diameter is 0.01~
We proposed a porous polyolefin hollow fiber in which 1 μm micropores communicate between the inner and outer wall surfaces of the hollow fiber. However, since this is a hydrophobic porous polyolefin hollow fiber, it is used by temporarily making it hydrophilic with alcohol etc. and replacing it with water before use. If the surface of the porous polyolefin hollow fiber is brought into contact with air and dried by pulling out, there is a problem that the filtration performance decreases, and there has been a strong demand for the development of a hydrophilic porous polyolefin hollow fiber that does not have this problem.
［解決しようとする問題点］
本発明の目的は多孔質ポリオレフイン中空糸を
恒久的に親水化する処理方法及び親水化多孔質ポ
リオレフイン中空糸を提供することにある。[Problems to be Solved] An object of the present invention is to provide a treatment method for permanently making porous polyolefin hollow fibers hydrophilic, and to provide a hydrophilized porous polyolefin hollow fiber.
本発明の要旨は、中空糸内壁面より外壁面へつ
ながつた微小空孔を有するポリオレフイン中空糸
の微小空孔を形成している壁面の少なくとも１部
にエチレン−ビニルアセテート共重合体の鹸化物
からなる薄膜が保持されてなる親水化多孔質ポリ
オレフイン中空糸にあり、更に、前記ポリオレフ
イン中空糸の微小空孔を形成している壁面の少な
くとも１部にエチレン−ビニルアセテート共重合
体からなる薄膜を形成した後、該エチレン−ビニ
ルアセテート共重合体を鹸化することを特徴とす
る多孔質ポリオレフイン中空糸の親水化処理方法
にある。
The gist of the present invention is to provide at least a portion of the wall surface forming the micropores of a polyolefin hollow fiber having micropores connected from the inner wall surface of the hollow fiber to the outer wall surface from a saponified product of ethylene-vinyl acetate copolymer. A thin film made of ethylene-vinyl acetate copolymer is formed on at least a portion of the wall surface forming the micropores of the polyolefin hollow fiber. After that, the ethylene-vinyl acetate copolymer is saponified.
中空糸内壁面より外壁面へつながつた微小空孔
を有するポリオレフイン中空糸としては中空糸の
ほぼ長手方向に配列した多数のフイブリル相互間
に形成されている微小空孔が中空糸の内壁面と外
壁面との間を連通している多孔質中空糸であるこ
とが好ましい。このような中空糸は例えば特開昭
57−42919号に記載された方法により製造するこ
とができる。ポリオレフインとしてはポリエチレ
ン、ポリプロピレン、ポリ−４−メチルペンテ
ン、ポリテトラフルオロエチレン等を挙げること
ができる。 Polyolefin hollow fibers have micropores that connect from the inner wall surface to the outer wall surface of the hollow fiber. Preferably, the fibers are porous hollow fibers communicating with the wall surface. Such hollow fibers were developed by, for example,
It can be produced by the method described in No. 57-42919. Examples of the polyolefin include polyethylene, polypropylene, poly-4-methylpentene, polytetrafluoroethylene, and the like.
中空糸内壁面より外壁面へつながつた微小空孔
を有するポリオレフイン中空糸の微小空孔を形成
している壁面の少なくとも１部にエチレン−ビニ
ルアセテート共重合体からなる薄膜を形成して恒
久的に親水化されたポリオレフイン中空糸を得る
方法としては例えばエチレン−ビニルアセテート
共重合体を含有する溶液を多孔質ポリオレフイン
中空糸の微小空孔を形成している壁面の少なくと
も１部に付着された後、乾燥して溶剤を除去する
か、あるいは該エチレン−ビニルアセテート共重
合体の凝固剤溶液に浸漬し、急速凝固処理を行な
うことによつて水不溶性有機高分子の薄膜を形成
し、これを乾燥することにより得られる。該エチ
レン−ビニルアセテート共重合体のエチレン鎖は
多孔質ポリオレフイン中空糸に対し優れた親和性
を示すため、エチレン−ビニルアセテート共重合
体薄は多孔質ポリオレフイン中空糸膜の微細孔表
面に強固に付着する。但し、エチレン−ビニルア
セテート共重合体のエチレン含有率が多くなると
接着性は向上するが、親水性が低下するのでエチ
レン−ビニルアセテート共重合体のビニルアセテ
ートの含有率は20％重量以上であることが好まし
い。エチレン−ビニルアセテート共重合体を含有
する溶液のエチレン−ビニルアセテート共重合体
濃度は1.0〜5.0重量％であることが好ましい。1.0
重量％未満ではエチレン−ビニルアセテート共重
合体を鹸化処理後の親水性が充分得られないので
好ましくない。一方5.0重量％を越えるとポリエ
チレン中空糸の微細孔が閉塞し、濾過性が低下す
るので好ましくない。 A thin film made of ethylene-vinyl acetate copolymer is permanently formed on at least a part of the wall surface forming the micropores of a polyolefin hollow fiber having micropores connected from the inner wall surface of the hollow fiber to the outer wall surface. A method for obtaining hydrophilized polyolefin hollow fibers is, for example, by applying a solution containing an ethylene-vinyl acetate copolymer to at least part of the wall surface forming micropores of a porous polyolefin hollow fiber, Either by drying to remove the solvent, or by immersing the ethylene-vinyl acetate copolymer in a coagulant solution and performing a rapid coagulation process, a thin film of water-insoluble organic polymer is formed, and this is dried. It can be obtained by Since the ethylene chains of the ethylene-vinyl acetate copolymer exhibit excellent affinity for porous polyolefin hollow fibers, the ethylene-vinyl acetate copolymer thin film firmly adheres to the micropore surface of the porous polyolefin hollow fiber membrane. do. However, as the ethylene content of the ethylene-vinyl acetate copolymer increases, the adhesiveness improves, but the hydrophilicity decreases, so the vinyl acetate content of the ethylene-vinyl acetate copolymer must be 20% or more by weight. is preferred. The ethylene-vinyl acetate copolymer concentration of the solution containing the ethylene-vinyl acetate copolymer is preferably 1.0 to 5.0% by weight. 1.0
If it is less than % by weight, the ethylene-vinyl acetate copolymer will not have sufficient hydrophilicity after saponification treatment, which is not preferable. On the other hand, if it exceeds 5.0% by weight, the fine pores of the polyethylene hollow fibers will be clogged, resulting in a decrease in filtration performance, which is not preferable.
これらの水不溶性有機高分子薄膜は多孔質中空
糸の微小空孔を形成している壁面にできるだけ均
一にしかもその付着量を最小限度に留め、付着処
理による中空糸微細空孔の閉塞をできるだけ少な
くすることが好ましい。 These water-insoluble organic polymer thin films are applied as uniformly as possible to the wall surface forming the micropores of the porous hollow fiber, and the amount of adhesion is kept to a minimum, thereby minimizing the clogging of the hollow fiber micropores due to the adhesion treatment. It is preferable to do so.
鹸化処理を行なう方法としては水酸化ナトリウ
ム等のアルカリ水溶液中で一定時間加熱処理し、
ビニルアセテート部分のアセチル基を水酸基に添
加すればよく、アルカリ濃度、鹸化触媒や加熱条
件等の変更によつて鹸化度を適宜調整することが
できる。 The method of saponification treatment is to heat-treat for a certain period of time in an alkaline aqueous solution such as sodium hydroxide.
The acetyl group of the vinyl acetate moiety may be added to the hydroxyl group, and the degree of saponification can be adjusted as appropriate by changing the alkali concentration, saponification catalyst, heating conditions, etc.
実施例
以下、実施例によつて本発明を説明する。実施
例における共重合体の保持量は未処理の中空糸１
ｇに対する値であり、各実施例の鹸化処理時には
鹸化触媒として第四級アンモニウム塩を１ｇ／
の割合で添加した。EXAMPLES The present invention will be explained below with reference to Examples. The amount of copolymer retained in the examples is 1 for untreated hollow fibers.
The quaternary ammonium salt was used as a saponification catalyst at 1 g/g during the saponification treatment in each example.
It was added at a ratio of
実施例 １
エチレン−ビニルアセテート共重合体（組成比
55：45）３重量部をトルエン97重量部に溶解して
得た25℃の溶液中に中空糸のほぼ長手方向に配列
した多数のフイブリル相互間に形成されている微
小空孔が中空糸の内壁面と外壁面との間を連通し
ているポリエチレン多孔質中空糸（三菱レイヨン
(株)製、商品名EHF）を30秒間浸漬した後、真空
乾燥機により50℃で３時間乾燥して溶剤の除去を
行なつた。Example 1 Ethylene-vinyl acetate copolymer (composition ratio
55:45) In a solution at 25°C obtained by dissolving 3 parts by weight of toluene in 97 parts by weight of toluene, micropores formed between a large number of fibrils arranged approximately in the longitudinal direction of the hollow fibers. Polyethylene porous hollow fiber (Mitsubishi Rayon) connecting the inner wall surface and outer wall surface
Co., Ltd. (trade name: EHF) for 30 seconds, and then dried in a vacuum dryer at 50° C. for 3 hours to remove the solvent.
次に水酸化ナトリウム10ｇを１の水に溶解し
たアルカリ水溶液中に浸漬し、60℃で１時間鹸化
処理を行なつた後水洗、乾燥して親水性多孔質ポ
リエチレン中空糸を得た。 Next, the fibers were immersed in an alkaline aqueous solution in which 10 g of sodium hydroxide was dissolved in 1 water, saponified at 60° C. for 1 hour, washed with water, and dried to obtain hydrophilic porous polyethylene hollow fibers.
この中空糸100本をＵ字型に束ね、中空糸端部
を脂肪でハウジングに固定して中空色有効長10cm
の濾過モジユールを作成した。このモジユールに
0.4Kg／cm2といる低い水圧で濾過したところ優れ
た透水性を示した。 100 of these hollow fibers are bundled in a U-shape, and the ends of the hollow fibers are fixed to the housing with fat, and the effective length of the hollow fibers is 10 cm.
A filtration module was created. to this module
When filtered at a low water pressure of 0.4 Kg/cm 2 , it showed excellent water permeability.
さらに水圧１Kg／cm2で水を１時間濾過した後、
水抜き取り、50℃の真空乾燥機で20時間乾燥した
後、水を濾過して耐水圧、透水量を調べたところ
乾燥による性能の低下は見られなかつた。 After further filtering the water for 1 hour at a water pressure of 1Kg/ cm2 ,
After removing the water and drying it in a vacuum dryer at 50°C for 20 hours, the water was filtered and the water pressure resistance and water permeability were examined, and no deterioration in performance was observed due to drying.
比較例
親水化されていない実施例１で用いたと同様の
ポリエチエン中空糸を用い、実施例１と同様の濾
過モジユールを作成し、水を濾過しようとした
が、水圧３Kg／cm2下では水は前く濾過されなかつ
た。Comparative Example A filtration module similar to that used in Example 1 was created using polyethylene hollow fibers similar to those used in Example 1, which had not been made hydrophilic, and an attempt was made to filter water, but under a water pressure of 3 Kg/cm 2 , water was Previously unfiltered.
実施例 ２
エチレン−ビニラセテート共重合体（モル組成
比56.8：43.2）15ｇをアセトン１に溶して得た
25℃の溶液を用いその他の条件は実施例１と同様
にして浸付処理と熱風乾燥による溶剤除去を種実
質したところ共重合体の保持量は0.12ｇ／ｇであ
つた。Example 2 Obtained by dissolving 15 g of ethylene-vinylacetate copolymer (molar composition ratio 56.8:43.2) in 1 part of acetone.
Using a solution at 25° C., the other conditions were the same as in Example 1, including dipping treatment and hot air drying to remove the solvent, and the amount of copolymer retained was 0.12 g/g.
続いて中空糸を酸水化ナトリウム13ｇを１の
水に溶解したアルカリ水溶液中に浸漬して63℃で
1.5時間鹸化処理した後、水洗、中和処理、水洗、
乾燥して親水化多孔質ポリエチレン中空糸を得
た。 Next, the hollow fiber was immersed in an alkaline aqueous solution containing 13 g of sodium acid hydride dissolved in 1 part of water and heated at 63°C.
After saponification treatment for 1.5 hours, washing with water, neutralization treatment, washing with water,
After drying, hydrophilized porous polyethylene hollow fibers were obtained.
この中空糸に鹸化処理共重合体が0.084ｇ／ｇ
保持されており、直接染料（グイレクトスカイブ
ルー6B）で染色処理したところ微細孔表面の全
部がほぼ均一に染色された。又、この中空糸を75
℃のエタノール／水＝80／20（体積％）、１時間の
抽出処理を４回くり返して得られた抽出物をFT
−NMRで分析したとろエチレン量は568モル％、
ビニルアルコール量は41.0モル％であり、酢酸ビ
ニル量は2.2モル％であつた。 This hollow fiber contains 0.084g/g of saponified copolymer.
When dyed with a direct dye (GiRect Sky Blue 6B), the entire surface of the micropores was dyed almost uniformly. Also, this hollow fiber is 75
FT
-The amount of ethylene analyzed by NMR is 568 mol%,
The amount of vinyl alcohol was 41.0 mol%, and the amount of vinyl acetate was 2.2 mol%.
親水化多孔質ポリエチレン中空糸100本を用い
て有効膜面積70cm2の濾過モジユールを製作し、差
圧１Kg／cm2で水を透水したところ透水量は7.2
ml／cm2・minであつた。 A filtration module with an effective membrane area of 70 cm 2 was fabricated using 100 hydrophilized porous polyethylene hollow fibers, and when water was permeated at a differential pressure of 1 Kg/cm 2 , the water permeation amount was 7.2.
It was ml/cm 2 min.
１時間透水後、水を抜きとり真空乾燥機を用い
て50℃で24時間乾燥した後、再び透水量を測定し
たところ乾燥前と同様の透水量が得られた。 After water permeation for 1 hour, the water was removed and dried at 50°C for 24 hours using a vacuum dryer.The water permeation amount was measured again, and the same water permeation amount as before drying was obtained.
実施例 ３
浸漬処理時間を３分間とし、その他の条件は実
施例２と同様にして、エチレン−ビニルアセテー
ト共重合体が0.158ｇ／ｇ保持された中空糸を得
た。Example 3 The immersion treatment time was 3 minutes, and the other conditions were the same as in Example 2 to obtain a hollow fiber in which 0.158 g/g of ethylene-vinyl acetate copolymer was retained.
次にこの中空糸を水／エタノール（70／30体積
％）１と水酸化ナトリウム50ｇの溶液中に浸漬
し、70℃で５時間ケン化処理した後、実施例２と
同様にして水洗、中和処理、水洗、乾燥して鹸化
処理重合体が0.104ｇ／ｇ保持された中空糸を得
た。 Next, this hollow fiber was immersed in a solution of 1 water/ethanol (70/30 volume %) and 50 g of sodium hydroxide, saponified at 70°C for 5 hours, and washed with water in the same manner as in Example 2. A hollow fiber containing 0.104 g/g of the saponified polymer was obtained by washing with water, washing with water, and drying.
実施例２と同様にして抽出された抽出物中のエ
チレン量は56.8モル％、ビニルアルコール量は
42.4モル％、ビニルアセテート量は0.77モル％で
あつた。 The amount of ethylene in the extract extracted in the same manner as in Example 2 was 56.8 mol%, and the amount of vinyl alcohol was
The vinyl acetate content was 42.4 mol%, and the amount of vinyl acetate was 0.77 mol%.
又、実施例２と同様にして差圧１Kg／cm2で透水
したところ6.9ml／cm2・minであつた。透水と乾
燥をくり返しても透水性能の低下は認められなか
つた。 Further, when water was permeated at a differential pressure of 1 Kg/cm 2 in the same manner as in Example 2, the water permeation was 6.9 ml/cm 2 ·min. No decrease in water permeability was observed even after repeated water permeation and drying.
［発明の効果］
本発明の親水化された多孔質ポリオレフイン中
空糸は優れた親水性を有しており、エタノール等
による親水化前処理を行なわずとも良好な透水性
を示し、濾過中又は濾過後に膜が乾燥しても濾過
性能の低下はほとんど認められず、その実用的効
果は極めて大きい。[Effects of the Invention] The hydrophilized porous polyolefin hollow fibers of the present invention have excellent hydrophilicity and exhibit good water permeability even without pretreatment for hydrophilization with ethanol etc. Even after the membrane dries, there is almost no decrease in filtration performance, and its practical effects are extremely large.
Claims (1)
孔を有するポリオレフイン中空糸の微小空孔を形
成している壁面の少なくとも１部にエチレン−ビ
ニルアセテート共重合体の鹸化物からなる薄膜が
保持されてなる親水化多孔質ポリオレフイン通中
糸。 ２ 中空糸内壁面より外壁面へつながつた微小空
孔を有するポリオレフイン中空糸の微小空孔を形
成している壁面の少なくとも１部にエチレン−ビ
ニルアセテート共重合体からなる薄膜を形成した
後、該エチレン−ビニルアセテート共重合体を鹸
化することを特徴とする多孔質ポリオレフイン中
空糸の親水化処理方法。[Scope of Claims] 1. A saponified product of ethylene-vinyl acetate copolymer is added to at least a portion of the wall surface forming the micropores of a polyolefin hollow fiber having micropores connected from the inner wall surface to the outer wall surface of the hollow fiber. A hydrophilic porous polyolefin thread consisting of a thin film held therein. 2. After forming a thin film made of ethylene-vinyl acetate copolymer on at least part of the wall surface forming the micropores of the polyolefin hollow fiber having micropores connected from the inner wall surface of the hollow fiber to the outer wall surface, A method for making porous polyolefin hollow fibers hydrophilic, the method comprising saponifying an ethylene-vinyl acetate copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59245606A JPS61125408A (en) | 1984-11-20 | 1984-11-20 | Method for making porous polyolefin hollow yarn hydrophilic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59245606A JPS61125408A (en) | 1984-11-20 | 1984-11-20 | Method for making porous polyolefin hollow yarn hydrophilic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61125408A JPS61125408A (en) | 1986-06-13 |
| JPH041653B2 true JPH041653B2 (en) | 1992-01-13 |
Family
ID=17136211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59245606A Granted JPS61125408A (en) | 1984-11-20 | 1984-11-20 | Method for making porous polyolefin hollow yarn hydrophilic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61125408A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61161103A (en) * | 1985-01-10 | 1986-07-21 | Terumo Corp | Hydrophilic porous membrane and its preparation |
| JPS61271003A (en) * | 1985-05-27 | 1986-12-01 | Asahi Medical Co Ltd | Hydrophilic compound porous membrane and its preparation |
| JPH0696102B2 (en) * | 1990-03-08 | 1994-11-30 | 旭化成工業株式会社 | Condensate treatment method |
| US5232642A (en) * | 1991-02-08 | 1993-08-03 | Mitsubishi Rayon Co., Ltd. | Process of making porous polypropylene hollow fiber membrane of large pore diameter |
| JPH05212256A (en) * | 1992-02-07 | 1993-08-24 | Mitsubishi Rayon Co Ltd | Heat-resistant porous membrane, heat-resistant hydrophilic porous membrane and their production |
| CN102489184B (en) * | 2011-11-28 | 2013-11-20 | 北京碧水源膜科技有限公司 | Polyvinylidene difluoride hollow fiber micro-filtration membrane with permanent hydrophilicity, and preparation method thereof |
-
1984
- 1984-11-20 JP JP59245606A patent/JPS61125408A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61125408A (en) | 1986-06-13 |
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| EXPY | Cancellation because of completion of term |