CN1060614A - A kind of preparation technology who strengthens milipore filter - Google Patents
A kind of preparation technology who strengthens milipore filter Download PDFInfo
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- CN1060614A CN1060614A CN 90108213 CN90108213A CN1060614A CN 1060614 A CN1060614 A CN 1060614A CN 90108213 CN90108213 CN 90108213 CN 90108213 A CN90108213 A CN 90108213A CN 1060614 A CN1060614 A CN 1060614A
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- supporter
- film
- filter paper
- casting solution
- strengthens
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Abstract
The invention belongs to membrane separation technique.
Though the making of existing cellulose-acetafolic has several different methods, but owing to become film-strength low, operation inconvenience.The objective of the invention is to increase the mechanical strength of film, water flux is greatly improved when guaranteeing that high rejection is arranged.Technology of the present invention is the cellulose acetate membrane material to be compounded in strengthen on the supporter.Make supporter with the filter paper that strengthens, adopt precipitation classification that pellicle and supporter are combined with each other.This enhancing film has intensity height, water flux is big, rejection is high and operating pressure is low advantage.This film can be used for concentrating urase and other macromolecular substances, also can be used for holding back and purifying drinking water of particulates such as various emulsions and bacterium.
Description
The invention belongs to membrane separation technique.
Enhancing film with the cellulose acetate material development has following several: the woollen blanket that soaked with thermosetting resin (1) prepares CA as supporter and strengthens film; (2) strengthen film with mylar as the CA that strengthens supporter; (3) CA-titanium compound film.In recent years, the present inventor must use big porous ultrafiltration membrane in the research that concentrates urase, but very low with the intensity of the big porous ultrafiltration membrane of cellulose acetate preparation, so operation is extremely inconvenient.The objective of the invention is to increase the mechanical strength of film, guaranteeing that film has under the precursor of high rejection simultaneously, water flux increases substantially.For this reason, when the system film, adopt the high-hydrophilic material as supporter, reinforcing agent and link material.And with precipitation classification link material strand two ends are separately fixed in pellicle and the supporter, make pellicle and supporter become firm integral body.Preparation process is as follows:
(1) preparation strengthens filter paper
Polyvinyl alcohol is dissolved, make the aqueous solution of 1-5%, filter paper is flooded in this aqueous solution, take out the back and in air, dry, promptly make enhancing filter paper.
(2) preparation casting solution
Be made into casting solution with the cellulose acetate of 6-17% and the link material of 1-6%.
(3) preparation gel media
First order gel media can water or the low molecular weight aliphatic alcohol solution of 10-15%, also can be with dissolving link material, but can not dissolve other reagent of cellulose acetate.Second level gel media is a water.
(4) system film
Enhancing filter paper (supporter) described in above-mentioned (1) is wetting in first order gel media, pave, inhale surperficial drop.Casting solution described in above-mentioned (2) is poured over supporter one end,, makes it be covered with supporter casting solution Yangjing.Filter paper and pellicle are put into second level gel media together, behind the gel strengthen milipore filter.
The enhancing film of the present invention's preparation has following advantage: (1) intensity height, it is convenient to use.The wet strength of this enhancing film is 12-70 a times of monofilm, and dry strength is 120-250 a times of monofilm.(2) water flux is big.The 2-3 that wet enhancing membrane flux is the wet monofilm of prescription together is more than 150 times of dried monofilm of filling a prescription together doubly.(3) rejection height.The enhancing film that the acetate fiber cellulose content is made at the casting solution more than 8% reaches more than 99% the rejection of urase; The enhancing film of acetate fiber cellulose content more than 7% reaches more than 99% the rejection of assorted bacterium in the water; The enhancing film of acetate fiber cellulose content more than 6% reaches more than 99% the rejection of emulsion particles such as polyvinyl acetate.(4) operating pressure is low.Because of this enhancing membrane structure is even, resistance is little, and good water permeability is so operating pressure only needs 0.5kg/cm
2About, usually at 0.1-0.7kg/cm
2Scope is just enough, and general milipore filter operating pressure is then at 1-10kg/cm
2In the scope.Because operating pressure is low, just so not harsh to the requirement of filter, except adopting the pressurization of machinery and Compressed Gas, also available negative pressure leaching.Because pressure is low, helps overcoming the concentration polarization phenomenon in the film separation process, also help safety in production.
Embodiment one
(1) preparation strengthens filter paper, preparation first order gel media and casting solution
Dissolve polyvinyl alcohol in the boiling water bath is made 2% the aqueous solution, and filter paper is flooded in this aqueous solution, take out the back in air, dry, standby.The ethanol water of preparation 10% is made first order gel media.Preparation contains cellulose acetate 8%, polyethylene glycol 1.5%, formamide 48%, adds the casting solution of acetone to 100%, and is standby after dissolving, the deaeration.
(2) system film
The filter paper that strengthened is wetting in first order gel media, be tiled on the glass plate, inhale the drop that goes to its surface unnecessary with dried filter paper.Casting solution is poured over supporter one end, casting solution Yangjing, makes it be covered with supporter with scraper.Again glass plate, filter paper and pellicle are put into water together, behind the gel strengthen milipore filter.
Claims (4)
1, a kind of preparation method who strengthens milipore filter, this method is the cellulose acetate membrane material to be compounded in strengthen on the supporter, it is characterized by and using the filter paper that strengthens through polyvinyl alcohol is supporter, adopts precipitation classification that pellicle and supporter are combined with each other, and preparation process is as follows:
(1) preparation strengthens filter paper
Polyvinyl alcohol is dissolved, make the aqueous solution of 1-5%, filter paper is flooded in this aqueous solution, take out the back and in air, dry, promptly make enhancing filter paper.
(2) preparation casting solution
Be mixed with casting solution with the cellulose acetate of 6-17% and the link material of 1-6%.
(3) system film
Enhancing filter paper (supporter) described in above-mentioned (1) is wetting in first order gel media, pave, inhale surperficial drop, casting solution described in above-mentioned (2) is poured over supporter one end, with casting solution Yangjing, make it be covered with supporter, filter paper and pellicle are put into second level gel media together, behind the gel strengthen milipore filter.
2, according to the film-forming method described in the claim 1, it is characterized by first order gel media can be the low molecular weight aliphatic alcohol solution of water or 10-15%, maybe can dissolve link material, but can not dissolve the reagent of cellulose acetate.Second level gel media is a water.
3,, it is characterized by the composition adjustment of casting solution and change and to make the enhancing microporous barrier or strengthen reverse osmosis membrane according to the film-forming method described in the claim 1.
4, according to the film-forming method described in the claim 1, it is characterized by described link material can be to be dissolved in casting solution, can be dissolved in the linear polymer of first order gel media again, or water soluble polymer, especially can be polyethylene glycol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108213 CN1028208C (en) | 1990-09-30 | 1990-09-30 | Preparation process of reinforced ultrafiltration membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108213 CN1028208C (en) | 1990-09-30 | 1990-09-30 | Preparation process of reinforced ultrafiltration membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060614A true CN1060614A (en) | 1992-04-29 |
| CN1028208C CN1028208C (en) | 1995-04-19 |
Family
ID=4880896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108213 Expired - Fee Related CN1028208C (en) | 1990-09-30 | 1990-09-30 | Preparation process of reinforced ultrafiltration membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028208C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059355C (en) * | 1995-01-24 | 2000-12-13 | 中国科学院大连化学物理研究所 | Membrane stack medium and casing of microporous affinity membrane separator for biological macromolecule purifying |
| CN113477099A (en) * | 2021-06-23 | 2021-10-08 | 湖北大学 | Preparation method of antifouling and wear-resistant composite membrane for emulsion separation |
-
1990
- 1990-09-30 CN CN 90108213 patent/CN1028208C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059355C (en) * | 1995-01-24 | 2000-12-13 | 中国科学院大连化学物理研究所 | Membrane stack medium and casing of microporous affinity membrane separator for biological macromolecule purifying |
| CN113477099A (en) * | 2021-06-23 | 2021-10-08 | 湖北大学 | Preparation method of antifouling and wear-resistant composite membrane for emulsion separation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1028208C (en) | 1995-04-19 |
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