CN103386262A - Polytetrafluoroethylene microporous membrane used for seawater desalination and preparation method thereof - Google Patents
Polytetrafluoroethylene microporous membrane used for seawater desalination and preparation method thereof Download PDFInfo
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- CN103386262A CN103386262A CN2013103096622A CN201310309662A CN103386262A CN 103386262 A CN103386262 A CN 103386262A CN 2013103096622 A CN2013103096622 A CN 2013103096622A CN 201310309662 A CN201310309662 A CN 201310309662A CN 103386262 A CN103386262 A CN 103386262A
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- desalinization
- longitudinal stretching
- microporous teflon
- teflon membran
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention discloses a polytetrafluoroethylene microporous membrane used for seawater desalination and a preparation method thereof. The method comprises steps of (1) mixing materials; (2) preparing blanks; (3) extruding; (4) rolling; (5) stretching longitudinally after ungreasing treatment; (6) stretching longitudinally after surface treatment; (7) sintering and solidifying after transversely stretching; and (8) performing a composite process. Compared with the prior art, the polytetrafluoroethylene microporous membrane used for seawater desalination membrane distillation technologies has an average pore size of 0.3 [mu]m, a porosity of 85%, a flux greater than 5 L/M2.H and good performances.
Description
Technical field
The invention belongs to the encapsulant technical field, more specifically relate to a kind of microporous teflon membran for desalinization and preparation method thereof.
Background technology
Polytetrafluoroethylene (PTFE) (referred to as PTFE) microporous barrier is rod, the band by the polytetrafluoroethylextruded extruded moulding, through being rolled into the semi-finished product of film, and after the stretching of the temperature below fusing point, thermal finalization, the porous article that obtains.
Poly tetrafluoroethylene has following micro-structural:
(1) PTFE microporous membrane configuration of surface is to have araneose microcellular structure.Form hole between microfibre, the microfibre orientation is substantially parallel with draw direction; The junction of fibre bundle is node, and it is to be tangled and be connected to form by many microfibres.
(2) the PTFE film belongs to asymmetric membrane, and the positive and negative pore size of film is variant.
(3) the cross section pore size of film is larger than its surperficial pore size, to pore size, difference is arranged also in length and breadth, and vertically micropore is greater than laterally.
(4) cross section of film is a kind of network structure, and the very complicated variations such as netted connection, hole edge cover, duct bending are arranged on the three-dimensional structure in hole, may form a passage by a plurality of micropores, and also likely a micropore is connected with a plurality of passages.
Microporous teflon membran is a kind of pliable and tough and whippy poromerics, and porosity is high, and even aperture distribution has the characteristic of permeable watertight, can be used as the ultra-clean filter membrane of sterilization filter membrane, electrolyte membrane, gas dialysis membrane, various solvents etc.Microporous teflon membran sticks on fabric can make anorak, ventilative tent, raincoat etc.
Obtain the process meaning desalinization of fresh water from seawater.Desalinization, namely utilize seawater desalination to produce fresh water, is the increment technique of increasing income that realizes the water resource utilization, can increase the fresh water total amount, and be not subjected to space-time and climatic effect, water quality is good, price is gradually reasonable, can ensure the stable water supplies such as coastal Drinking Water for Residents and Industrial Boiler moisturizing.
Method for desalting seawater used has seawater freezing process, electroosmose process, the way of distillation, hyperfiltration now, at present the hyperfiltration of application reverse osmosis membrane simple with its equipment, be easy to safeguard and the advantage of EM equipment module dominates the market rapidly, progressively replacing the way of distillation becomes most widely used method.Microporous teflon membran is used for desalinization will have effect preferably, but not yet has ripe technology can prepare the microporous teflon membran that is exclusively used in desalinization at present.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, a kind of microporous teflon membran for desalinization is provided.
Another object of the present invention is to provide the preparation method of this microporous teflon membran.
For achieving the above object, the present invention has taked following technical scheme:
A kind of preparation method of the microporous teflon membran for desalinization comprises following technical step:
(1) batch mixing;
(2) base;
(3) extrude;
(4) calendering;
(5) longitudinal stretching after ungrease treatment;
(6) longitudinal stretching after surface treatment;
(7) sintering curing after cross directional stretch;
(8) combination process.
In technique scheme, the batch mixing of described step (1) is for add the hydro carbons extrusion aid in teflon resin powder, and both are by weight for the ratio of 1:0.25～0.28, fully mixing, and under 50 ℃ standing 24 hours, the formation material.
In technique scheme, the base of described step (2) is for being pressed into material in advance the cylindrical base of Φ 120mm under 50 ℃.
In technique scheme, extruding as cylindrical base is placed on the pushing machine of step (3), be forced into the round bar of Φ 20～22mm under 55～60 ℃ of conditions.
In technique scheme, the calendering of step (4) is placed on calender for justifying bar, is rolled into the oil-containing base band under 70 ℃ of conditions, and thickness is 120～150 microns.
In technique scheme, after the ungrease treatment of step (5) longitudinal stretching be with the oil-containing base band 260～280 ℃ of lower degreasings, remove extrusion aid, and carry out longitudinal stretching for the first time, draw ratio is to become the degreasing base band after 3～4 times.
In technique scheme, after the surface treatment of step (6), longitudinal stretching, for carry out longitudinal stretching for the second time under 280～290 ℃, obtains the longitudinal stretching Ranvier's membrane.
In technique scheme, after the cross directional stretch of step (7), sintering curing is with the longitudinal stretching Ranvier's membrane, on film balance, laterally stretches under 120 ℃,, then 350 ℃ of sintering curings 50 seconds, obtains to prepare film thickness and be the polytetrafluoroethylene (PTFE) basis film of 20 microns.
In technique scheme, the combination process of step (8) is: again Ranvier's membrane is carried out compound without any medium again keeping on the impregnable basis of micropore, finally obtain the desalinization distillation technique film of 100～500 microns.
The preparation-obtained microporous teflon membran of technique scheme.
Compared with prior art, the microporous teflon membran that is used for desalinization film distillation technology use film of technique preparation of the present invention, the average aperture of its film is 0.3 micron, and porosity is 85%, and flow, greater than 5L/M2.H, has better performance.
The specific embodiment
The invention will be further described below in conjunction with specific embodiment, but the present invention's scope required for protection is not limited to the described scope of embodiment.
Embodiment 1
A kind of preparation method of the microporous teflon membran for desalinization comprises following technical step:
(1) batch mixing: add the ISOPARK of Exxon Mobil Corporation as the hydro carbons extrusion aid in the label that the Daikin chemical company is produced is the teflon resin powder of F106, both are by weight for the ratio of 1:0.25, fully mixing, under 50 ℃ standing 24 hours, form material;
(2) base: the cylindrical base that material is pressed in advance Φ 120mm under 50 ℃;
(3) extrude: cylindrical base is placed on the pushing machine, is forced into the round bar of Φ 22mm under 55 ℃ of conditions;
(4) calendering: will justify bar and be placed on calender, and be rolled into the oil-containing base band under 70 ℃ of conditions, thickness is 150 microns;
(5) longitudinal stretching after ungrease treatment: the oil-containing base band, 260 ℃ of lower degreasings, is removed extrusion aid, and carried out longitudinal stretching for the first time, and draw ratio is to become the degreasing base band after 4 times;
(6) longitudinal stretching after surface treatment: carry out longitudinal stretching for the second time under 280 ℃, obtain the longitudinal stretching Ranvier's membrane;
(7) sintering curing after cross directional stretch:, with the longitudinal stretching Ranvier's membrane, on film balance, laterally stretch under 120 ℃,, then 350 ℃ of sintering curings 50 seconds, obtain to prepare film thickness and be the polytetrafluoroethylene (PTFE) basis film of 20 microns.
(8) combination process: again Ranvier's membrane is carried out compound without any medium again keeping on the impregnable basis of micropore, finally obtain the desalinization distillation technique film of 100-500 micron.
Embodiment 2
A kind of preparation method of the microporous teflon membran for desalinization comprises following technical step:
(1) batch mixing: add the ISOPARK of Exxon Mobil Corporation as the hydro carbons extrusion aid in the label that du pont company is produced is the teflon resin powder of FD3309, both are by weight for the ratio of 1:0.28, fully mixing, under 50 ℃ standing 24 hours, form material;
(2) base: the cylindrical base that material is pressed in advance Φ 120mm under 50 ℃;
(3) extrude: cylindrical base is placed on the pushing machine, is forced into the round bar of Φ 20mm under 60 ℃ of conditions;
(4) calendering: will justify bar and be placed on calender, and be rolled into the oil-containing base band under 70 ℃ of conditions, thickness is 120 microns;
(5) longitudinal stretching after ungrease treatment: the oil-containing base band, 280 ℃ of lower degreasings, is removed extrusion aid, and carried out longitudinal stretching for the first time, and draw ratio is to become the degreasing base band after 3 times;
(6) longitudinal stretching after surface treatment: carry out longitudinal stretching for the second time under 290 ℃, obtain the longitudinal stretching Ranvier's membrane;
(7) sintering curing after cross directional stretch:, with the longitudinal stretching Ranvier's membrane, on film balance, laterally stretch under 120 ℃,, then 350 ℃ of sintering curings 50 seconds, obtain to prepare film thickness and be the polytetrafluoroethylene (PTFE) basis film of 20 microns;
(8) combination process: again Ranvier's membrane is carried out compound without any medium again keeping on the impregnable basis of micropore, finally obtain the desalinization distillation technique film of 100--500 micron.
In above-described embodiment, adopt the desalinization film distillation technology film microporous teflon membran of technique preparation of the present invention, the average aperture of its film is 0.3 micron, and porosity is 85%, and flow is greater than 5L/M2.H.
Claims (10)
1. a preparation method who is used for the microporous teflon membran of desalinization, is characterized in that, comprises the steps:
(1) batch mixing;
(2) base;
(3) extrude;
(4) calendering;
(5) longitudinal stretching after ungrease treatment;
(6) longitudinal stretching after surface treatment;
(7) sintering curing after cross directional stretch;
(8) combination process.
2. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: the batch mixing of described step (1) is for adding the hydro carbons extrusion aid in teflon resin powder, both are by weight for the ratio of 1:0.25～0.28, fully mixing, under 50 ℃ standing 24 hours, form material.
3. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1 is characterized in that: the base of described step (2) is for being pressed into material in advance the cylindrical base of Φ 120mm under 50 ℃.
4. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: extruding as cylindrical base is placed on the pushing machine of step (3) is forced into the round bar of Φ 20～22mm under 55～60 ℃ of conditions.
5. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: the calendering of step (4) is placed on calender for justifying bar, be rolled into the oil-containing base band under 70 ℃ of conditions, thickness is 120～150 microns.
6. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: after the ungrease treatment of step (5), longitudinal stretching is 260～280 ℃ of lower degreasings with the oil-containing base band, remove extrusion aid, and carrying out longitudinal stretching for the first time, draw ratio is to become the degreasing base band after 3～4 times.
7. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: after the surface treatment of step (6), longitudinal stretching, for carry out longitudinal stretching for the second time under 280～290 ℃, obtains the longitudinal stretching Ranvier's membrane.
8. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: after the cross directional stretch of step (7), sintering curing is with the longitudinal stretching Ranvier's membrane, on film balance, laterally stretch under 120 ℃, then 350 ℃ of sintering curings 50 seconds, obtain to prepare film thickness and be the polytetrafluoroethylene (PTFE) basis film of 20 microns.
9. the preparation method of a kind of microporous teflon membran for desalinization according to claim 1, it is characterized in that: the combination process of step (8) is: again Ranvier's membrane is carried out compound without any medium again keeping on the impregnable basis of micropore, finally obtain the desalinization distillation technique film of 100～500 microns.
10. the preparation-obtained microporous teflon membran of preparation method of a kind of microporous teflon membran for desalinization claimed in claim 1.
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| CN2013103096622A CN103386262A (en) | 2013-07-18 | 2013-07-18 | Polytetrafluoroethylene microporous membrane used for seawater desalination and preparation method thereof |
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| CN2013103096622A CN103386262A (en) | 2013-07-18 | 2013-07-18 | Polytetrafluoroethylene microporous membrane used for seawater desalination and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103937133A (en) * | 2014-04-02 | 2014-07-23 | 湖州森诺氟材料科技有限公司 | Individual black expanded polytetrafluoroethylene (e-PTFE) membrane used in electronics industry and preparation method thereof |
| CN109049909A (en) * | 2018-07-27 | 2018-12-21 | 湖州森诺氟材料科技有限公司 | The polytetrafluoroethylcomposite composite film and production technology of bacteriostasis, and deodorization |
| CN111672338A (en) * | 2020-05-18 | 2020-09-18 | 浙江格尔泰斯环保特材科技股份有限公司 | Preparation method of polytetrafluoroethylene microporous film with ultrahigh porosity |
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| US5209850A (en) * | 1992-06-19 | 1993-05-11 | W. L. Gore & Associates, Inc. | Hydrophilic membranes |
| CN100589869C (en) * | 2006-11-30 | 2010-02-17 | 中国人民解放军总后勤部军需装备研究所 | Method of processing polytetrafluoroethene nano-aperture filter membrane |
| CN102527248A (en) * | 2012-01-06 | 2012-07-04 | 湖州森诺氟材料科技有限公司 | Preparation method of photocatalytic antimicrobial polytetrafluoroethylene microporous membrane |
| CN102658038A (en) * | 2012-04-10 | 2012-09-12 | 杭州洁弗膜技术有限公司 | Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material |
-
2013
- 2013-07-18 CN CN2013103096622A patent/CN103386262A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5209850A (en) * | 1992-06-19 | 1993-05-11 | W. L. Gore & Associates, Inc. | Hydrophilic membranes |
| CN100589869C (en) * | 2006-11-30 | 2010-02-17 | 中国人民解放军总后勤部军需装备研究所 | Method of processing polytetrafluoroethene nano-aperture filter membrane |
| CN102527248A (en) * | 2012-01-06 | 2012-07-04 | 湖州森诺氟材料科技有限公司 | Preparation method of photocatalytic antimicrobial polytetrafluoroethylene microporous membrane |
| CN102658038A (en) * | 2012-04-10 | 2012-09-12 | 杭州洁弗膜技术有限公司 | Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103937133A (en) * | 2014-04-02 | 2014-07-23 | 湖州森诺氟材料科技有限公司 | Individual black expanded polytetrafluoroethylene (e-PTFE) membrane used in electronics industry and preparation method thereof |
| CN109049909A (en) * | 2018-07-27 | 2018-12-21 | 湖州森诺氟材料科技有限公司 | The polytetrafluoroethylcomposite composite film and production technology of bacteriostasis, and deodorization |
| CN111672338A (en) * | 2020-05-18 | 2020-09-18 | 浙江格尔泰斯环保特材科技股份有限公司 | Preparation method of polytetrafluoroethylene microporous film with ultrahigh porosity |
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