CN104759210A - Preparation method of high-performance PVDF (polyvinylidene fluoride) composite hollow fiber ultrafiltration membrane - Google Patents
Preparation method of high-performance PVDF (polyvinylidene fluoride) composite hollow fiber ultrafiltration membrane Download PDFInfo
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Abstract
The invention relates to the technical field of ultrafiltration membrane preparation and particularly relates to a preparation method of a high-performance PVDF (polyvinylidene fluoride) composite hollow fiber ultrafiltration membrane. The preparation method comprises the following steps: dissolving a high molecular material in a solvent, and adding an additive to prepare a membrane casting solution; preparing a hollow fiber membrane by tape casting; evaporating partial solvent in the membrane; immersing the membrane in a non-solvent liquid so as to gelate and cure the liquid-phase membrane in the liquid; and finally performing thermal treatment and pre-pressing treatment of the cured membrane to obtain the ultrafiltration membrane. The preparation method of the ultrafiltration membrane has simple steps and is low in cost and high in preparation speed; the using effect of the ultrafiltration membrane is good; in order to improve the water permeability and resolution capability of ultrafiltration membrane, certain polar groups can be introduced into the membrane forming material; when the ultrafiltration membrane is used for treating oily wastewater, concentration and separation are performed without the need of demulsification, and wastewater recycling can be realized so as to solve the problem of secondary pollution.
Description
Technical field
The present invention relates to optimal experimental design technical field, especially a kind of preparation method of high-performance PVDF composite hollow fibre milipore filter.
Background technology
Pvdf membrane and PVDF membrane (polyvinylidene fluoride) are a kind of solid supports conventional in immunoblotting.Pvdf membrane is hydrophobic, and membrane aperture varies, and along with the continuous reduction of membrane aperture, film is more firm to low-molecular-weight protein combination.The albumen being greater than 20000 selects the film of 0.45um, and the albumen being less than 20000 selects the film of 0.2um.Pvdf membrane needs pretreatment in use, is the positive charged group on activation film by the object of methyl alcohol process, makes its easier and electronegative protein combination.Pvdf membrane has higher mechanical strength, is the ideal solid phase support material in blotting.
Water treatment pvdf membrane, is divided into milipore filter and microfiltration membranes two kinds, is mainly used in the pre-treatment of sewage, desalinization etc., removes the impurity such as large molecule, bacterium, silt.
The commercial Application of milipore filter is very extensive, has become one of Novel chemical unit operations.For separating of, in concentrated, purifying biological goods, pharmaceutical products and food industry; Also for the terminal processing device in blood treatment, wastewater treatment and ultra-pure water preparation.Milipore filter is successfully utilized to carry out the concentrated purification of Chinese herbal medicine in China.Milipore filter is along with the progress of technology, and its screening function will be improved and strengthen, to the contribution of human society also by increasing.
The structure of milipore filter has symmetrical and asymmetric dividing.The former is isotropic, does not have cortex, and the hole on all directions is all the same, belongs to in-depth filtration; The latter has finer and close top layer and the bottom based on finger, and skin depth is 0.1 micron or less, and has the orderly micropore of arrangement, and underlayer thickness is 200 ~ 250 microns, belongs to both surface filtration.The milipore filter of industrial application is generally anisotropic membrane.The membrane material of milipore filter mainly contains the polyvinyl alcohol, modified acrylic polymer etc. of cellulose and its derivates, Merlon, polyvinyl chloride, Kynoar, polysulfones, polyacrylonitrile, polyamide, polysulfonamides, SPSF, interlinkage.
Milipore filter screening process, with the pressure differential of film both sides for driving force, take milipore filter as filter medium, under pressure, when stoste flows through film surface, the many tiny micropore that ultrafiltration membrane surface gathers only allows water and small-molecule substance pass through and become permeate, and the material that in stoste, volume is greater than film surface micropore footpath is then trapped within the liquid feeding side of film, become concentrate, thus realize the object of the purification to stoste, isolation and identification.The ultrafiltration membrane filaments tube wall of every meter long about there is the micropore of 6,000,000,000 0.01 micron, its aperture only allows the beneficial mineral matter in hydrone, water and trace element to pass through, and the volume of smallest bacteria is all more than 0.02 micron, therefore bacterium and the colloid, iron rust, suspension, silt, larger molecular organics etc. more much bigger than bacterium volume can be retained down by milipore filter, thus achieve purification process.
Preparation method's step of existing milipore filter is too complicated, and cost is too high, and the result of use of finished product is not very desirable.
Summary of the invention
In order to overcome existing deficiency, the invention provides a kind of preparation method of high-performance PVDF composite hollow fibre milipore filter.
The technical solution adopted for the present invention to solve the technical problems is: a kind of preparation method of high-performance PVDF composite hollow fibre milipore filter, is characterized in that, comprise the following steps:
(1) first macromolecular material is dissolved in solvent, adds additive, be made into casting solution;
(2) hollow fiber type is made by the tape casting;
(3) by solvent content evaporation in film;
(4) film is immersed in the liquid of non-solvent, the film of liquid phase just gel solidification in a liquid;
(5) finally the film of solidification is heat-treated and precompressed process, can milipore filter be obtained.
According to another embodiment of the invention, comprise hollow fiber type film further and adopt spin processes preparation.
According to another embodiment of the invention, the mixed liquor that solvent is DMAC and N-dimethylacetylamide is comprised further.
According to another embodiment of the invention, comprising additive is further phosphoglycerol.
According to another embodiment of the invention, comprising non-solvent is further water.
The invention has the beneficial effects as follows, this ultrafiltration membrane preparation method step is simple, cost is low, and the speed of preparation is fast, and result of use is good, in order to improve permeability rate and the resolution capability of milipore filter, some polar group can also be introduced in filmogen, adopt this ultrafiltration membrane treatment oily waste water, not only not need breakdown of emulsion to carry out concentrating and separating, and can waste water recycling be realized, solve secondary pollution problem.
Detailed description of the invention
A preparation method for high-performance PVDF composite hollow fibre milipore filter, comprises the following steps: be first dissolved in solvent by macromolecular material, add additive, be made into casting solution; Hollow fiber type is made by the tape casting; By solvent content evaporation in film; Film is immersed in the liquid of non-solvent, the film of liquid phase just gel solidification in a liquid; Finally heat-treat and precompressed process the film of solidification, can obtain milipore filter, hollow fiber type film adopts spin processes preparation, and solvent is the mixed liquor of DMAC and N-dimethylacetylamide, and additive is phosphoglycerol, and non-solvent is water.
Adopt the processing method of this milipore filter oily waste water:
The waste water of the industrial discharge such as chemical industry, metallurgy is the waste water containing oil emulsion mostly, and its water quality characteristics is that oil is in emulsified state, and pH value is in alkalescence, and COD is dense, can reach 11000-37000mg/L.Adopt the method process such as traditional Gravity Separation, electrolysis, chemical coagulation and solvent extraction, be not only difficult to obtain desirable effect, and easily produce secondary pollution, and increase the problems such as operating cost.Adopt microfiltration membranes or ultrafiltration membrane treatment oily waste water, not only do not need breakdown of emulsion to carry out concentrating and separating, and can waste water recycling be realized, solve secondary pollution problem.
After using the micro-filter technology of hollow-fibre membrane to carry out deep purifying process to oil field reinjection water, purify waste water middle suspended solids particle diameter < 0.8 μm, suspended solid amount < 0.5mg/L, single membrane module detergent power > 1.5t/h, result meets the requirement of oil field reuse completely through the oil field produced oil-polluted water of purified treatment.
Employing maximum diameter of hole is the Al of 0.35 μm
2o
3the TiO of/PVDF composite hollow fiber membrane and 0.39 μm
2/ PVDF composite hollow fiber membrane process oily waste water, clearance is respectively up to 92.42% and 91%.
More than illustrate just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skill in the art understand, when not departing from the spirit and scope that claims limit; many amendments, change or equivalence can be made, but all will fall within the scope of protection of the present invention.
Claims (5)
1. a preparation method for high-performance PVDF composite hollow fibre milipore filter, is characterized in that, comprises the following steps:
(1) first macromolecular material is dissolved in solvent, adds additive, be made into casting solution;
(2) hollow fiber type is made by the tape casting;
(3) by solvent content evaporation in film;
(4) film is immersed in the liquid of non-solvent, the film of liquid phase just gel solidification in a liquid;
(5) finally the film of solidification is heat-treated and precompressed process, can milipore filter be obtained.
2. the preparation method of high-performance PVDF composite hollow fibre milipore filter according to claim 1, is characterized in that, described hollow fiber type film adopts spin processes preparation.
3. the preparation method of high-performance PVDF composite hollow fibre milipore filter according to claim 1, is characterized in that, described solvent is the mixed liquor of DMAC and N-dimethylacetylamide.
4. the preparation method of high-performance PVDF composite hollow fibre milipore filter according to claim 1, is characterized in that, described additive is phosphoglycerol.
5. the preparation method of high-performance PVDF composite hollow fibre milipore filter according to claim 1, is characterized in that, described non-solvent is water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510143732.0A CN104759210A (en) | 2015-03-31 | 2015-03-31 | Preparation method of high-performance PVDF (polyvinylidene fluoride) composite hollow fiber ultrafiltration membrane |
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| CN201510143732.0A CN104759210A (en) | 2015-03-31 | 2015-03-31 | Preparation method of high-performance PVDF (polyvinylidene fluoride) composite hollow fiber ultrafiltration membrane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115400602A (en) * | 2022-09-05 | 2022-11-29 | 星达（泰州）膜科技有限公司 | Automatic production method of ultrafiltration membrane |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147848A (en) * | 2007-07-20 | 2008-03-26 | 天津工业大学 | Polyvinylidene fluoride film hydrophilically modified method |
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2015
- 2015-03-31 CN CN201510143732.0A patent/CN104759210A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147848A (en) * | 2007-07-20 | 2008-03-26 | 天津工业大学 | Polyvinylidene fluoride film hydrophilically modified method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115400602A (en) * | 2022-09-05 | 2022-11-29 | 星达（泰州）膜科技有限公司 | Automatic production method of ultrafiltration membrane |
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Application publication date: 20150708 |