CN101143305A - Priority dealcoholization PDMS/PVDF multi-layer compound film and preparation method thereof - Google Patents
Priority dealcoholization PDMS/PVDF multi-layer compound film and preparation method thereof Download PDFInfo
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- 239000004205 dimethyl polysiloxane Substances 0.000 title claims abstract description 40
- 235000013870 dimethyl polysiloxane Nutrition 0.000 title claims abstract description 40
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 title claims abstract description 40
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000002033 PVDF binder Substances 0.000 title claims description 32
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims description 32
- 150000001875 compounds Chemical class 0.000 title claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000007654 immersion Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 229920000728 polyester Polymers 0.000 claims abstract description 8
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 7
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims description 9
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 6
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 5
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- WFKAJVHLWXSISD-UHFFFAOYSA-N isobutyramide Chemical compound CC(C)C(N)=O WFKAJVHLWXSISD-UHFFFAOYSA-N 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- MEYZYGMYMLNUHJ-UHFFFAOYSA-N tunicamycin Natural products CC(C)CCCCCCCCCC=CC(=O)NC1C(O)C(O)C(CC(O)C2OC(C(O)C2O)N3C=CC(=O)NC3=O)OC1OC4OC(CO)C(O)C(O)C4NC(=O)C MEYZYGMYMLNUHJ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims 1
- 239000012528 membrane Substances 0.000 abstract description 27
- 238000000926 separation method Methods 0.000 abstract description 21
- 230000004907 flux Effects 0.000 abstract description 9
- 239000000243 solution Substances 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000007864 aqueous solution Substances 0.000 abstract description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 abstract description 2
- 238000005373 pervaporation Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 229920005573 silicon-containing polymer Polymers 0.000 abstract description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 1
- 238000010422 painting Methods 0.000 abstract 1
- 229920001296 polysiloxane Polymers 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 abstract 1
- 238000011426 transformation method Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000009738 saturating Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920000265 Polyparaphenylene Polymers 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920006147 copolyamide elastomer Polymers 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
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- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to an ethanol-permselective PDMS/PVDF multilayered composite membrane and the preparation method, which belongs to a pervaporation membrane separation field. The multilayered composite membrane is made based on the following processes: firstly, the PVDF porous basal membrane is prepared by a two-faced wiped film of kynoar polyvinylindene fluoride (PVDF) solution on the polyester non-woven fabric support layer using submersion and sedimentation transformation method; secondly, the membrane liquid, which contains dimethyl silicone polymer (PDMS), cross linking agent and catalyst, is prepared, and the PVDF porous basal membrane is immersed in the membrane liquid for 10s-1min. Each of two sides of the PVDF basal membrane are coated with a layer of silicone base by using immersion and painting method, and then the PVDF basal membrane is dried and cross linked, and so the multilayered composite membrane is made. The existing pure PDMS membrane has bad separability to ethanol aqueous solution, and the highest separation factor is 10.8 ([EtOH] equals to 8wt percent, 30 DGE C). The multilayered symmetrical composite membrane made of the invention has an excellent ethanol-permselective property to low concentration ethanol aqueous solution (5wt percent-30wt percent), and for the ethanol aqueous solution which has a concentration of 5wt percent, the separation factor alpha value equals to 15, and the permeation flux J equals to 450g/m<SUP>2</SUP>h, under the temperature of 60 DGE C.
Description
Technical field
The present invention relates to a kind of PDMS/PVDF multilayer complex films that can be used for evaporation alcohol permselective and preparation method thereof, belong to the infiltrating and vaporizing membrane separation field.
Background technology
Arrival along with global energy crisis and environmental crisis; force people to seek new forms of energy and replace non-renewable energy resources such as oil; wherein bio-ethanol fuel (alcohol biofuel) not only can replace traditional petroleum-based energy, and can significantly reduce the pollution of environment as a kind of clean energy resource.At present, developed countries such as American-European Japan in various degree with bio-ethanol instead of part oil, and be devoted to large-scale production bio-ethanol fuel to solve energy crisis.
Prepare in the ethanol process at biofermentation, increase (5~8wt%) along with concentration of alcohol in the fermentation tank, microbial fermentation bacterium poison deactivation, the fermentation reaction that generates ethanol there is inhibitory action [1], adopt the infiltration evaporation method on the spot the ethanol in the zymotic fluid to be separated, can avoid the inhibitory action of ethanol, improve the production capacity of fermentation tank, and can obtain high concentration ethanol reaction.Infiltration evaporation (Pervaporation) is as one of membrane separation technique new branch, demonstrate special advantages in the fields such as separation of the reluctant azeotropic mixture of traditional separation means (as the separation of second alcohol and water), nearly boiling point system: its separation is not limited by VLE, first separation degree height, implement simple, pollution-free, low energy consumption, can carry out coupling with traditional separation means such as rectifying, extraction, absorption, crystallizations, be easy to be coupled with chemical reaction, be applicable to various production scales, just becoming the up-and-coming youngster in the separation unit operation family.
At present, the typical case of the preferential alcohol permselective membrane material of macromolecule representative is dimethyl silicone polymer (PDMS), because it has higher fractional free volume, hydrophobicity is stronger, is typical hydrophobicity membrane material.PDMS is rubbery state, can make hollow-fibre membrane, and tubular membrane does not have the laminar film of support, supports laminar film etc.In 4.4 to 10.8 scopes, the separation factor difference is so big to be because the difference of initial film material, film-forming method and test condition (comprise and select layer thickness, supporting layer, crosslink density, feeding liquid concentration, operating temperature etc.) causes to currently reported pure PDMS film for the separation factor of ethanol water system.
People drop into great effort and are devoted to develop the macromolecule member material that preferential saturating pure performance is better than PDMS, but up to the present, the preferential alcohol permselective membrane material category of the separating property excellence of being developed is less, mainly contains silicone rubber membrane, fluoro-containing copolymer film, polypropylene screen and other modifying polymer film." a kind of osmotic evaporating and separating membrane of separating liquid mixture " (US5254251) discloses a kind of preparation method of double-layered compound film, selecting layer is the polyphenylene ether-polyamide block copolymer, the enhancing base layer is a silk screen, its matrix strength is higher, selectivity and permeation flux also improve a lot, but its production cost of polyphenylene ether-polyamide copolymer is higher, has limited its large-scale industrial application." with the method for separating aqueous solution of alcohol with polyvinylidene fluoride permeable vaporizing membrane " (CN1239012A) discloses a kind of method that adopts vinylidene to prepare preferential alcohol permselective membrane, but this diffusion barrier intensity is lower, voltage endurance capability is relatively poor, and diffusion barrier separating alcohol concentration limit has limited its commercial Application between 0.1wt%~20wt%." a kind of preparation method of priority dealcoholization diffusion barrier " (CN1640534A) discloses the method that a kind of method that adopts the concentrated emulsions polymerization prepares cyclosiloxane priority dealcoholization diffusion barrier, but polymer manufacture technology is comparatively complicated, and its separation system is limited in the ethanol water of 25vol%, and its permeation flux only is 36.2~100.3g/m
2H has limited it greatly in industrial application.
Summary of the invention
The objective of the invention is provides a kind of preparation method who can be used for the PDMS/PVDF multilayer complex films of preferential saturating alcohol at above-mentioned key technical problem.This multilayer complex films has been broken through the best separation factor 10.8 of pure PDMS film ([EtOH]=8wt%, 30 ℃), is the 5wt% ethanol water for concentration, and 60 ℃ it is from factor-alpha=15 down, and permeation flux is J=450g/m
2H, and production cost is lower, has better industrial application prospect.
Key of the present invention is to adopt preferential alcohol permselective membrane material PDMS cheap and easy to get, prepare and have the PDMS/PVDF/ nonwoven/composite membrane of PVDF/PDMS multilayer new construction, make this film break through the limit of the preferential saturating pure performance of pure PDMS film, have the saturating pure effect of infiltration evaporation of excellent performance, have the large-scale industrial application prospect.
A kind of PDMS/PVDF multilayer complex films that is used for priority dealcoholization, it is characterized in that: it is the multilayer complex films of symmetrical structure, middle for polyester non-woven fabric supporting layer, supporting layer both sides are 45 μ mPVDF porous counterdies, the counterdie outside is that two-layer 10-15 μ mPDMS selects layer.
A kind of preparation method who is used for the PDMS/PVDF multilayer complex films of priority dealcoholization is characterized in that, may further comprise the steps:
The preparation of step 1:PVDF porous counterdie
The preparation method of step 1:PVDF porous counterdie, PVDF is dissolved in organic solvent, and compound concentration is the PVDF solution of 15wt%, stirs under 70 ℃, filter, deaeration, at the direct knifing of a side of polyester non-woven fabric, water is coagulation bath, adopt the immersion precipitation phase inversion to obtain the 45 μ mPVDF porous counterdies that nonwoven supports, after treating that exchange of solvent thoroughly,, dry naturally with alcohol immersion counterdie 5min; Make 45 μ mPVDF porous counterdies with same method at the nonwoven opposite side then,, dry naturally through alcohol immersion 5min.
The preparation method of step 2:PDMS layer, it is characterized in that: with mass ratio is that 30: 2.5: 1 PDMS, crosslinking agent, catalyst dibutyl tin dilaurate is dissolved in the organic solvent, be mixed with the solution that percetage by weight is 15wt%~30wt%, stir, the PVDF counterdie that before gel does not take place nonwoven is supported places solution 10s~1min, take out the back and dry naturally, with crosslinked complete, thickness is 10~15 μ m.
Solvent described in the step 1 is characterized in that: N, dinethylformamide, N, N-dimethylacetylamide, triethyl phosphate, N-methyl adjoin in the pyrrolidone any one.
PDMS described in the step 2 is characterized in that: the viscosity of PDMS is 5000~50000.
Solvent described in the step 2 is characterized in that: any one in normal heptane, n-hexane, the oxolane.
Crosslinking agent described in the step 2 is characterized in that: any one in phenyltrimethoxysila,e, phenyl triethoxysilane, the ethyl orthosilicate.
The PDMS/PVDF multilayer complex films that the present invention is prepared, production technology is simpler, and production cost is lower, when being used for the preferential alcohol permselective membrane of ethanol water, for concentration is 5wt%~30wt% ethanol water, and temperature is in 40 ℃~80 ℃ scopes, and the permeation flux of film is 0.2~2.61kg/m
2H, separation factor is the highest can to reach 15 ([EtOH]=5wt%, 60 ℃).The present invention finds a kind of preparation method of PDMS/PVDF multilayer complex films, and has broken through the limit of the saturating pure performance of pure PDMS, obtains having the vaporize PDMS/PVDF composite membrane of pure performance of good penetration.
The specific embodiment
Technical scheme of the present invention is done the explanation in a step below in conjunction with specific embodiment: the polyester non-woven fabric described in the step 1, the whole polyester nonwoven of the model NAS-222 that can provide for Ao Long company.
Embodiment 1
1) 6gPVDF is dissolved in is made into the solution that concentration is 15wt% in the 34g triethyl phosphate (TEP), stir at 70 ℃, filter, deaeration is at the direct knifing of a side of polyester non-woven fabric, water is coagulation bath, adopt the immersion precipitation phase inversion to obtain the PVDF porous counterdie that nonwoven supports, thickness is 45 μ m, treat that exchange of solvent thoroughly after, with alcohol immersion counterdie 5min, dry naturally; Make the porous counterdie with same method in another survey of nonwoven then,, dry naturally through alcohol immersion 5min.
2) be that 50000 PDMS, 0.5g phenyltrimethoxysila,e, 0.2g catalyst dibutyl tin dilaurate are dissolved in the normal heptane with 6g viscosity, be mixed with the solution that concentration is 30wt%, stir, the PVDF counterdie that before gel does not take place nonwoven is supported places film liquid 10s, taking out the back dries naturally, with crosslinked complete, the thick 10 μ m of PDMS tunic.
Measure the preferential pure performance that resulting PDMS/PVDF multilayer complex films is the ethanol water of 5wt%~30wt% to concentration, the results are shown in Table 1 and table 2.
Under table 1 different temperatures, the preferential pure The performance test results ([EtOH]=5wt%) of example 1
Temperature (℃) | Absolute pressure behind the film (Pa) | Permeation flux (g/m 2h) | Separation factor |
40 | 200 | 211.4 | 8.7 |
50 | 200 | 329.5 | 12.2 |
60 | 200 | 452.2 | 15.0 |
70 | 200 | 589.2 | 11.1 |
80 | 200 | 887.9 | 7.0 |
Under the table 2 different ethanol concentration situation, the evaporation alcohol permselective The performance test results of example 1 (60 ℃ of temperature)
Concentration of alcohol (wt%) | Absolute pressure behind the film (Pa) | Permeation flux (g/m 2h) | Separation factor |
5 | 200 | 452.2 | 15.0 |
10 | 200 | 512.2 | 10.3 |
20 | 200 | 714.1 | 7.0 |
30 | 200 | 818.6 | 4.1 |
Example 2~4
Example 2~4 has been investigated the different film forming condition of PDMS/PVDF multilayer complex films and the relation of film properties, sees Table 3.Remaining condition is with embodiment 1.
The preparation condition of table 3 example 2~4 films and performance tabulation
Example number | 2 | 3 | 4 | |
PVDF porous counterdie | Solvent | The N-methyl pyrrolidone | N, the N-dimethylacetylamide | N, dinethylformamide |
Thickness (μ m) | 45 | 45 | 45 | |
PDMS selects layer | PDMS viscosity | 5000 | 10000 | 20000 |
Solution concentration | 30wt% | 15wt% | 15wt% | |
Crosslinking agent | Phenyl triethoxysilane [2.5wt%] | Ethyl orthosilicate [1.25wt%] | Phenyltrimethoxysila,e [2.5wt%] | |
Catalyst | Dibutyl tin dilaurate [1wt%] | Dibutyl tin dilaurate [0.5 wt%] | Dibutyl tin dilaurate [0.5 wt%] | |
Solvent | Normal heptane [66.5wt%] | N-hexane [83.25wt%] | Oxolane [83.25wt%] | |
Immersion time | 20s | 30s | 1min | |
Thickness (μ m) | 15 | 10 | 15 | |
Film properties | Probe temperature (℃) | 60 | 60 | 60 |
Absolute pressure behind the film (Pa) | 200 | 200 | 200 | |
Feeding liquid concentration (wt%) | 5 | 5 | 5 | |
Permeation flux (kg/m 2h) | 208.6 | 405.2 | 195.3 | |
Separation factor | 14.6 | 14.0 | 14.5 |
Its separation factor of PDMS/PVDF multilayer complex films is identical with example 1 with the Changing Pattern of temperature and concentration with permeation flux in the example 2~4.
Claims (6)
1. priority dealcoholization PDMS/PVDF multilayer complex films, it is characterized in that: it is the multilayer complex films of symmetrical structure, middle for polyester non-woven fabric supporting layer, supporting layer both sides are 45 μ m PVDF porous counterdies, the counterdie outside is that two-layer 10-15 μ m PDMS selects layer.
2. the preparation method of the PDMS/PVDF multilayer complex films of a priority dealcoholization is characterized in that, may further comprise the steps:
The preparation method of step 1:PVDF porous counterdie, PVDF is dissolved in organic solvent, and compound concentration is the PVDF solution of 15wt%, stirs under 70 ℃, filter, deaeration, at the direct knifing of a side of polyester non-woven fabric, water is coagulation bath, adopt the immersion precipitation phase inversion to obtain the 45 μ m PVDF porous counterdies that nonwoven supports, after treating that exchange of solvent thoroughly,, dry naturally with alcohol immersion counterdie 5min; Make 45 μ m PVDF porous counterdies with same method at the nonwoven opposite side then,, dry naturally through alcohol immersion 5min;
The preparation method of step 2:PDMS layer, it is characterized in that: with mass ratio is that 30: 2.5: 1 PDMS, crosslinking agent, catalyst dibutyl tin dilaurate is dissolved in the organic solvent, be mixed with the solution that the percentage by weight number is 15wt%~30wt%, stir, the PVDF counterdie that before gel does not take place nonwoven is supported places solution 10s~1min, take out the back and dry naturally, with crosslinked complete, it is 10~15 μ m that PDMS selects tunic thick.
3. according to the preparation method described in the claim 2, it is characterized in that: the solvent in the step 1 is N, dinethylformamide, N, the N-dimethylacetylamide, triethyl phosphate, in the N-methyl pyrrolidone any one.
4. according to the preparation method described in the claim 2, it is characterized in that: described PDMS layer viscosity is 5000-50000.
5. according to the preparation method described in the claim 2, it is characterized in that: solvent is any one in normal heptane, n-hexane, the oxolane in the step 2.
6. according to the preparation method described in the claim 2, it is characterized in that: described crosslinking agent is a kind of in phenyltrimethoxysila,e, phenyl triethoxysilane, ethyl orthosilicate, amine propyl-triethoxysilicane, the octyl group trimethoxy silane.
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CN102061095A (en) * | 2010-11-11 | 2011-05-18 | 暨南大学 | Hybrid film containing fluorosilicone/silicon rubber, and preparation method and application thereof |
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CN102921311A (en) * | 2012-10-30 | 2013-02-13 | 北京化工大学 | Preparation method of type-priority ethanol permeable membrane |
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CN103203190A (en) * | 2013-04-24 | 2013-07-17 | 清华大学 | Hydroxyl-terminated polybutadiene-silicone rubber crosslinked alcohol-permselective composite membrane and preparation method thereof |
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CN103566783A (en) * | 2013-11-13 | 2014-02-12 | 济南泰易膜科技有限公司 | Polydimethylsiloxane (PDMS)-base layer polyvinylidene fluoride (PVDF)-separating layer pervaporation membrane and preparation method thereof |
CN103657456A (en) * | 2013-12-18 | 2014-03-26 | 北京工商大学 | Preparation method of ethanol-permselective POSS (polyhedral oligomeric silsesquioxanes)/silicone rubber composite membrane |
CN103691325A (en) * | 2013-12-18 | 2014-04-02 | 北京工商大学 | Preparation method of ethanol permselective inorganic particles/PVDF (Polyvinylidene Fluoride) composite membrane |
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