CN103100307A - Characterization method of interface combination condition of enhancement type hollow fiber membrane - Google Patents
Characterization method of interface combination condition of enhancement type hollow fiber membrane Download PDFInfo
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- CN103100307A CN103100307A CN2013100694380A CN201310069438A CN103100307A CN 103100307 A CN103100307 A CN 103100307A CN 2013100694380 A CN2013100694380 A CN 2013100694380A CN 201310069438 A CN201310069438 A CN 201310069438A CN 103100307 A CN103100307 A CN 103100307A
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Abstract
The invention discloses a characterization method of the interface combination condition of an enhancement type hollow fiber membrane. The characterization method comprises the following steps of: (1) enhancement type membrane sample preparation: (1) preparing a polyvinylidene fluoride-based enhancement type hollow fiber membrane sample: firstly preparing a polyvinylidene fluoride-based coating solution and a polyacrylonitrile-based coating solution, and then respectively uniformly coating the polyvinylidene fluoride-based coating solution and the polyacrylonitrile-based coating solution on the surface of a melt-spun polyvinylidene fluoride hollow fiber-based membrane through spinnerets to prepare a homogeneous enhancement type polyvinylidene fluoride hollow fiber membrane sample and a heterogenous enhancement type polyvinylidene fluoride hollow fiber membrane sample; and (2) preparing a polyacrylonitrile-based enhancement type membrane sample by the same method adopted in the step (1); (2) ultrasonic experiment: respectively placing the membrane samples prepared in the step (1) into an ultrasonic cleaner under the same condition for the ultrasonic experiment; and (3) flux test: carrying out pure water flux test on the membrane samples subjected to the ultrasonic experiment in the step (2), and indirectly characterizing the interface combination condition of the enhancement type hollow fiber membrane through obtained pure water flux change data.
Description
Technical field
The present invention relates to the film quality detection technique, be specially a kind of characterizing method of enhancement type hollow fiber film interface bonding state.
Background technology
Kynoar (or polyacrylonitrile) hollow-fibre membrane is widely used in micro-filtration, ultra-filtration process with its good performance, its preparation method is mainly to adopt immersion precipitation at present, and the film of this wet method gained, intensity is lower, film silk disrepair phenomenon appears often in membrane bioreactor (MBR) use procedure of reality, make the film treatment effect descend, shorten service life, production cost increases, and therefore improving film-strength has become to adapt to Production requirement the problem that Pvdf Microporous Hollow Fiber Membrane is needed solution badly.
Chinese patent literature CN102068922A and CN102600733A disclose a kind of preparation method of homogeneity reinforced type polyvinylidene fluoride hollow fiber film, Chinese patent literature CN102580577A discloses a kind of preparation method of enhanced polyacrylonitrile hollow fiber membrane, above-mentioned patent has proposed better membrane preparation method for the deficiency of existing hollow-fibre membrane intensity in MBR uses, but all fails the enhancement type hollow fiber film interface is described in detail in conjunction with the aspect and characterizes.Enhancement type hollow fiber film has good mechanical property and the higher precision of holding back, but strengthen film in MBR uses to the requirement of interface bond strength greater than its demand to hot strength, so the quality of film surface coating layer and film matrix bonding state will directly affect the serviceability of enhancement type hollow fiber film.In order better to be used in practice, it is necessary that enhancing membrane interface bonding state is characterized.
(the D.Lian such as D.Lian, Y.Suga, G.Shou, and S.Kurihara.An UltrasonicTesting Method for Detecting Delamination of Sprayed Ceramic Coating.In:Proceedings of14th ITSC[C] .Japan, 1995.961～965) test the ceramic layer of coating and the bonding state between its matrix with ultrasonic wave detector, can obtain more reliable data, but the method equipment is complicated, and can only detect the material that separates diameter greater than 1mm.In the scope of applicant's retrieval, there is no at present the research report that direct sign homogeneity strengthens the membrane material interface bonding state.
Summary of the invention
For the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is, a kind of characterizing method of enhancement type hollow fiber film interface bonding state is provided, this characterizing method adopts the method for more ultrasonic rear homogeneity and heterogeneous enhancement type hollow fiber film variations of flux indirectly to characterize its interface bonding state, method is simple, easy operating, is suitable for the industrialization practical application.
The technical scheme that the present invention solve the technical problem is: design a kind of characterizing method of enhancement type hollow fiber film interface bonding state, this characterizing method adopts following steps:
(1) preparation enhancement mode membrane sample
1. prepare polyvinylidene fluoride enhancement type hollow fiber film sample
At first prepare polyvinylidene fluoride and polyacrylonitrile-radical coating liquid, then it evenly is coated on respectively melt-spun polyvinylidene fluoride hollow fiber membrane surface by spinning head, make homogeneity reinforced type polyvinylidene fluoride hollow fiber membrane sample and heterogeneous reinforced type polyvinylidene fluoride hollow fiber membrane sample, and gained doughnut membrane sample is soaked in ultrafiltration water under room temperature the test afterwards until 2 days;
2. prepare polyacrylonitrile-radical enhancement mode membrane sample
Preparation polyvinylidene fluoride and polyacrylonitrile-radical coating liquid, then it evenly is coated on respectively polyacrylonitrile fibre hollow braided tube by spinning head surperficial, make heterogeneous enhanced polyacrylonitrile hollow fiber membrane sample and homogeneity enhanced polyacrylonitrile hollow fiber membrane sample, and the gained hollow-fibre membrane is soaked in ultrafiltration water under room temperature the test afterwards until 2 days;
(2) Experimental Ultrasonic: obtained membrane sample in (1) is put into respectively ultrasonic cleaner under the same conditions carry out Experimental Ultrasonic;
(3) flux test: the membrane sample after Experimental Ultrasonic in (2) is carried out the pure water flux test, with resulting pure water flux delta data, indirectly characterize the bonding state at enhancement type hollow fiber film interface.
Compared with prior art, the characteristics of the characterizing method of enhancement type hollow fiber film interface bonding state of the present invention are: by the effect of research ultrasonic cleaning to the combination of enhancement mode membrane interface, simulate under actual water environment, cause the segregation phenomenon of coat and the matrix of enhancement mode film because of the shake of film silk, aeration or backwash.But characterizing method of the present invention is the interface bonding state of side light coat and matrix to a certain extent, and simple to operate, low for equipment requirements, is suitable for the industrialization practical application.
The specific embodiment
The present invention is further elaborated below in conjunction with specific embodiment.
The characterizing method (hereinafter to be referred as characterizing method) of the enhancement type hollow fiber film interface bonding state of the present invention's design, this characterizing method adopts following steps:
1. preparation membrane sample
(1) the preparation polyvinylidene fluoride strengthens membrane sample
Preparation polyvinylidene fluoride and polyacrylonitrile-radical coating liquid, then it evenly is coated on respectively melt-spun polyvinylidene fluoride hollow fiber membrane surface by spinning head, make homogeneity reinforced type polyvinylidene fluoride hollow fiber membrane sample and heterogeneous reinforced type polyvinylidene fluoride hollow fiber membrane sample, and gained doughnut membrane sample is soaked in ultrafiltration water under room temperature the test afterwards until 2 days; Described preparation polyvinylidene fluoride and polyacrylonitrile-radical coating liquid are prior art.
(2) preparation polyacrylonitrile-radical enhancement mode membrane sample
Preparation polyvinylidene fluoride and polyacrylonitrile-radical coating liquid (can together prepare with (1)), then it evenly is coated on respectively polyacrylonitrile fibre hollow braided tube by spinning head surperficial, make heterogeneous enhanced polyacrylonitrile hollow fiber membrane sample and homogeneity enhanced polyacrylonitrile hollow fiber membrane sample, and the gained hollow-fibre membrane is soaked in ultrafiltration water under room temperature the test afterwards until 2 days;
(3) preparation polyvinylidene fluoride flat film
Then preparation Kynoar casting solution is scraped above-mentioned casting solution and is made flat sheet membrane, and immerses immediately in ultrafiltration water under room temperature to be tested after 2 days.
2. Experimental Ultrasonic: obtained sample and polyvinylidene fluoride hollow fiber basement membrane in (1) are put into respectively the ultrasonic cleaner ultrasonic tesint under the same conditions;
3. flux test: ultrasonic rear gained film in 2 is carried out the pure water flux test, obtain its pure water flux delta data, indirectly characterize the situation of this enhancing membrane interface combination with these data.
Obviously, in the ultrasonic cleaning process, when different supersonic frequencies acts on different films, can produce different impacts to membrane structure, change thereby obtain different membrane fluxs.On the one hand, if supersonic frequency is too high, enhancement type hollow fiber film basement membrane and this body structure of coat be by serious destruction, and in the ultrasonic cleaning process, the situation of change of membrane interface junction can't clearly show by the variation of flux; On the other hand, if supersonic frequency is too low, can't destroy the combination at membrane interface place within the shorter testing time, make test process seem tediously long.Therefore, more suitable supersonic frequency can kept the integrally-built while of basement membrane and coat, effectively destroy the bonding state at interface, strengthen membrane flux sudden change (referring to table 1-3) is arranged thereby make, this sudden change can be used for indirectly judging the difference of this enhancing membrane interface bonding state.
In the ultrasonic cleaning process, when the different ultrasonic times of same frequency act on different films, can produce different impacts to membrane structure, change thereby obtain different membrane fluxs.The process of the increase of ultrasonic time is the process of film filament length phase shake in the actual water environment of simulation, and consider the factor possibility that membrane structure is destroyed: one, passive basement membrane (PVDF basement membrane) destroys; Two, the surface coating layer (casting solution) that plays crown_interception destroys; Three, the destruction of junction, interface.Therefore, to when strengthening film and carry out different ultrasonic times tests, to melt-spun PVDF basement membrane (or PAN braided tube) and PVDF(or PAN) coat also carries out same test, thereby determines the Causes for Mutation of flux.
The present invention does not address part and is applicable to prior art.
The below provides specific embodiments of the invention, but embodiment does not limit the protection domain of the present patent application claim.
Embodiment 1
Preparation homogeneity reinforced type polyvinylidene fluoride hollow fiber film: be 10% Kynoar with mass fraction be after 10% poly-methyl pyrrole alkane ketone K30 mixes with mass fraction, being dissolved in mass fraction is in 80% dimethylacetamide solvent, after the stirred in water bath of 70 ℃ were dissolved in 3 hours fully, obtain coating liquid 60 ℃ of vacuum drying oven deaerations.Then under identical spinning condition, it evenly is coated on respectively melt-spun polyvinylidene fluoride hollow fiber membrane surface by spinning head, makes homogeneity reinforced type polyvinylidene fluoride hollow fiber film.Be soaked in ultrafiltration water under room temperature the gained hollow-fibre membrane to be tested after 2 days.
Experimental Ultrasonic: homogeneity reinforced type polyvinylidene fluoride hollow fiber film is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic beginning, take out the multistage basement membrane at 0min, 10min, 20min, 30min, 60min, 90min, 120min and 180min time point respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this supersonic frequency effect, homogeneity reinforced type polyvinylidene fluoride hollow fiber film significantly increases at the 90min place, and it has shown that indirectly membrane interface this moment junction suffered destruction.
Embodiment 2
Prepare heterogeneous reinforced type polyvinylidene fluoride hollow fiber film: be 10% polyacrylonitrile with mass fraction be after 10% poly-methyl pyrrole alkane ketone K30 mixes with mass fraction, being dissolved in mass fraction is in 80% dimethylacetamide solvent, after the stirred in water bath of 70 ℃ were dissolved in 3 hours fully, obtain coating liquid 60 ℃ of vacuum drying oven deaerations.Then under identical spinning condition, it evenly is coated on respectively melt-spun polyvinylidene fluoride hollow fiber membrane surface by spinning head, makes heterogeneous reinforced type polyvinylidene fluoride hollow fiber film.Be soaked in ultrafiltration water under room temperature the gained hollow-fibre membrane to be tested after 2 days.
Experimental Ultrasonic: heterogeneous reinforced type polyvinylidene fluoride hollow fiber film is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic beginning, take out the multistage basement membrane at this above-mentioned time point of 0min, 10min, 20min, 30min, 60min, 90min, 120min and 180min respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this ultrasonication, heterogeneous reinforced type polyvinylidene fluoride hollow fiber film significantly increases at the 20min place, and it has shown that indirectly membrane interface this moment junction suffered destruction.
Embodiment 3
Preparation homogeneity enhanced polyacrylonitrile tunica fibrosa: be 10% polyacrylonitrile with mass fraction be after 7% poly-methyl pyrrole alkane ketone K30 mixes with mass fraction, being dissolved in mass fraction is in 83% dimethyl sulfoxide solvent, after the stirred in water bath of 70 ℃ were dissolved in 3 hours fully, obtain coating liquid 45 ℃ of vacuum drying oven deaerations.Then under identical spinning condition, it evenly is coated on respectively polyacrylonitrile fibre hollow braided tube by spinning head surperficial, makes the homogeneity enhanced polyacrylonitrile hollow fiber membrane.Be soaked in ultrafiltration water under room temperature the gained hollow-fibre membrane to be tested after 2 days.
Experimental Ultrasonic: the homogeneity enhanced polyacrylonitrile hollow fiber membrane is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic beginning, take out the multistage basement membrane at this above-mentioned time point of 0min, 5min, 10min, 15min, 20min, 30min, 40min, 50min, 60min and 90min respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this supersonic frequency effect, the homogeneity enhanced polyacrylonitrile hollow fiber membrane significantly increases at the 15min place, and it has shown that indirectly membrane interface this moment junction suffered destruction.
Embodiment 4
Prepare heterogeneous enhanced polyacrylonitrile tunica fibrosa: be 10% Kynoar with mass fraction be after 7% poly-methyl pyrrole alkane ketone K30 mixes with mass fraction, being dissolved in mass fraction is in 83% dimethyl sulfoxide solvent, after the stirred in water bath of 70 ℃ were dissolved in 3 hours fully, obtain coating liquid 45 ℃ of vacuum drying oven deaerations.Then under identical spinning condition, it evenly is coated on respectively polyacrylonitrile fibre hollow braided tube by spinning head surperficial, makes heterogeneous enhanced polyacrylonitrile hollow fiber membrane.Be soaked in ultrafiltration water under room temperature the gained hollow-fibre membrane to be tested after 2 days.
Experimental Ultrasonic: the homogeneity enhanced polyacrylonitrile hollow fiber membrane is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic beginning, take out the multistage basement membrane at this above-mentioned time point of 0min, 5min, 10min, 15min, 20min, 30min, 40min, 50min, 60min and 90min respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this supersonic frequency effect, the homogeneity enhanced polyacrylonitrile hollow fiber membrane significantly increases at the 10min place, and it has shown that indirectly membrane interface this moment junction suffered destruction.
The below provides concrete comparative example of the present invention, but comparative example does not limit the protection domain of the present patent application claim.
Comparative example 1
Preparation basement membrane: prepare Pvdf Microporous Hollow Fiber Membrane with melt spinning method, take it as the reinforcement basement membrane.
Experimental Ultrasonic: the Pvdf Microporous Hollow Fiber Membrane basement membrane is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic cleaning begins, take out the multistage basement membrane at 0min, 10min, 20min, 30min, 60min, 90min, 120min and 180min time point respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this supersonic frequency effect, Pvdf Microporous Hollow Fiber Membrane basement membrane variations of flux is little, and membrane structure is kept better.
Comparative example 2
Preparation flat sheet membrane: be 18% Kynoar with mass fraction be after 7% poly-methyl pyrrole alkane ketone K30 mixes with mass fraction, being dissolved in mass fraction is in 75% dimethylacetamide solvent, after the stirred in water bath of 70 ℃ were dissolved in 3 hours fully, obtain casting solution 70 ℃ of vacuum drying oven deaerations.Then above-mentioned casting solution is scraped and made flat sheet membrane, and immerse immediately in ultrafiltration water under room temperature to be tested after 2 days.
Experimental Ultrasonic: the polyvinylidene fluoride flat film is put into ultrasonic cleaner, supersonic frequency is 40KHz, after ultrasonic beginning, take out the multistage basement membrane at 0min, 10min, 20min, 30min, 60min, 90min, 120min and 180min time point respectively and be one group, to be tested.
Performance Detection: gained film pure water flux the results are shown in table 1.Result shows, under this supersonic frequency effect, the polyvinylidene fluoride flat membrane flux changes little, and membrane structure is kept preferably;
Comparative example 3
Described according to embodiment 2, in the constant situation of other conditions, change supersonic frequency into 60KHz.
Performance Detection: the gained membrane structure is destroyed, can not measure its effective variations of flux.
The actual test that the present invention has carried out water flux to all hollow-fibre membranes and the flat sheet membrane of embodiment 1-4 and comparative example 1-3 gained, test result is listed in table 1,2 and 3.Water flux in embodiment and comparative example calculates can be according to following formula (a).The formula of described calculating membrane flux (a) is:
In formula (a): J----pure water flux (L/m
2H);
V-----sees through liquid long-pending (L);
Effective area (the m of A-----film
2);
T-----obtains the V volume and sees through the required time (h) of liquid.
Table 1 embodiment 1 and 2 gained water flux data
Table 2 embodiment 3-4 gained water flux data
Table 3 comparative example 1-2 gained water flux data
Claims (1)
1. the characterizing method of an enhancement type hollow fiber film interface bonding state, this characterizing method adopts following steps:
(1) preparation enhancement mode membrane sample
1. prepare polyvinylidene fluoride enhancement type hollow fiber film sample
At first prepare polyvinylidene fluoride and polyacrylonitrile-radical coating liquid, then it evenly is coated on respectively melt-spun polyvinylidene fluoride hollow fiber membrane surface by spinning head, make homogeneity reinforced type polyvinylidene fluoride hollow fiber membrane sample and heterogeneous reinforced type polyvinylidene fluoride hollow fiber membrane sample, and gained doughnut membrane sample is soaked in ultrafiltration water under room temperature the test afterwards until 2 days;
2. prepare polyacrylonitrile-radical enhancement mode membrane sample
Preparation polyvinylidene fluoride and polyacrylonitrile-radical coating liquid, then it evenly is coated on respectively polyacrylonitrile fibre hollow braided tube by spinning head surperficial, make heterogeneous enhanced polyacrylonitrile hollow fiber membrane sample and homogeneity enhanced polyacrylonitrile hollow fiber membrane sample, and the gained hollow-fibre membrane is soaked in ultrafiltration water under room temperature the test afterwards until 2 days;
(2) Experimental Ultrasonic: obtained membrane sample in (1) is put into respectively ultrasonic cleaner under the same conditions carry out Experimental Ultrasonic;
(3) flux test: the membrane sample after Experimental Ultrasonic in (2) is carried out the pure water flux test, with resulting pure water flux delta data, indirectly characterize the bonding state at enhancement type hollow fiber film interface.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103432916A (en) * | 2013-09-03 | 2013-12-11 | 天津工业大学 | Preparation method of enhanced hollow polyvinylidene fluoride fiber membrane |
| CN104530642A (en) * | 2014-12-15 | 2015-04-22 | 天津工业大学 | Solution phase inversion-based modification method of homogeneous polyester fiber and composite material product prepared from homogeneous polyester fiber |
| CN104815563A (en) * | 2015-04-20 | 2015-08-05 | 天津工业大学 | Reinforced hollow fibrous membrane and preparation method thereof |
| EP3095508A1 (en) | 2015-04-20 | 2016-11-23 | Tianjin Polytechnic University | Method for preparing homogeneous braid-reinforced ppta hollow fiber membrane |
| CN107596928A (en) * | 2017-10-12 | 2018-01-19 | 天津工业大学 | A kind of enhanced PVDF hollow-fibre membranes of homo-fibers and preparation method thereof |
| CN107638812A (en) * | 2017-10-16 | 2018-01-30 | 苏州富淼膜科技有限公司 | A kind of method of testing of enhancement type hollow fiber film interface bond strength |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1231940A (en) * | 1998-04-16 | 1999-10-20 | 中国科学院大连化学物理研究所 | Missing yarn examination method for hollow fibre composite membrane separator |
| US6370943B1 (en) * | 1998-03-02 | 2002-04-16 | Suez-Lyonnaise Des Eaux | Process for monitoring the integrity of hollow fiber filtration modules |
| CN1596145A (en) * | 2001-11-30 | 2005-03-16 | 泰特勒拉瓦股权公司及金融股份有限公司 | A cleaning efficiency testing method and apparatus for a filter in a filtering system |
-
2013
- 2013-03-05 CN CN201310069438.0A patent/CN103100307B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370943B1 (en) * | 1998-03-02 | 2002-04-16 | Suez-Lyonnaise Des Eaux | Process for monitoring the integrity of hollow fiber filtration modules |
| CN1231940A (en) * | 1998-04-16 | 1999-10-20 | 中国科学院大连化学物理研究所 | Missing yarn examination method for hollow fibre composite membrane separator |
| CN1596145A (en) * | 2001-11-30 | 2005-03-16 | 泰特勒拉瓦股权公司及金融股份有限公司 | A cleaning efficiency testing method and apparatus for a filter in a filtering system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103432916A (en) * | 2013-09-03 | 2013-12-11 | 天津工业大学 | Preparation method of enhanced hollow polyvinylidene fluoride fiber membrane |
| CN103432916B (en) * | 2013-09-03 | 2015-04-29 | 天津工业大学 | Preparation method of enhanced hollow polyvinylidene fluoride fiber membrane |
| CN104530642A (en) * | 2014-12-15 | 2015-04-22 | 天津工业大学 | Solution phase inversion-based modification method of homogeneous polyester fiber and composite material product prepared from homogeneous polyester fiber |
| CN104815563A (en) * | 2015-04-20 | 2015-08-05 | 天津工业大学 | Reinforced hollow fibrous membrane and preparation method thereof |
| EP3095508A1 (en) | 2015-04-20 | 2016-11-23 | Tianjin Polytechnic University | Method for preparing homogeneous braid-reinforced ppta hollow fiber membrane |
| CN107596928A (en) * | 2017-10-12 | 2018-01-19 | 天津工业大学 | A kind of enhanced PVDF hollow-fibre membranes of homo-fibers and preparation method thereof |
| CN107638812A (en) * | 2017-10-16 | 2018-01-30 | 苏州富淼膜科技有限公司 | A kind of method of testing of enhancement type hollow fiber film interface bond strength |
| CN107638812B (en) * | 2017-10-16 | 2021-05-04 | 苏州富淼膜科技有限公司 | Method for testing interface bonding strength of enhanced hollow fiber membrane |
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