CN109603590A - Nano modification film formulation and preparation method thereof is blended in a kind of high throughput pollution-resistant - Google Patents
Nano modification film formulation and preparation method thereof is blended in a kind of high throughput pollution-resistant Download PDFInfo
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- CN109603590A CN109603590A CN201910007763.1A CN201910007763A CN109603590A CN 109603590 A CN109603590 A CN 109603590A CN 201910007763 A CN201910007763 A CN 201910007763A CN 109603590 A CN109603590 A CN 109603590A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/52—Polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
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Abstract
The present invention provides a kind of high-throughput pollution-resistants, and nano modification film formulation and preparation method thereof is blended, pass through the method for the blendings such as charged modifying agent, nano material and polymer material, film critical flux has been prepared within the scope of 50-70LMH, nano modification film is blended in the high-throughput pollution-resistant that practical membrane flux is 30-40LMH, and has successfully carried out practical application.The present invention not only meets the requirement of film properties and MBR film, while solving existing nano material diffusion problem in actual application.
Description
Technical field
The invention belongs to MBR technology fields, and in particular to it is a kind of high throughput pollution-resistant be blended nano modification film formulation and
Preparation method.
Background technique
Nanotechnology and nano material are that the subject of 21 century forefront represents, and water treatment technology is most to develop 21 century
The subject technology of potential quality, the two combination will bring the major transformation of water treatment field, and the trend of current this change is first
Step appears.According to investigation, it is modified to carry out surface by the doped nano-material into polymer film or to it, makes film with receiving
The characteristic of rice material, is the hot spot of current membrane material technical research.The nano material generallyd use includes: metal nanoparticle
(such as Al2O3、TiO2And zeolite) and antimicrobial nano material (nano silver and carbon nanotube), photocatalysis nano material (such as TiO2) etc..
Metal oxide nano-material is added into film can be improved the hydrophily of film, to achieve the purpose that reduce fouling membrane.
Nanotechnology has broad prospects in the application of water treatment field, and nano material has not available for conventional material
Property, revolutionary breakthrough certainly will be brought for water treatment field.
Currently, Application of micron in be blended membrane technology shortcoming be, 1. Nano type blending and modifying film formulations it is small
It has a try and tests the problem inconsistent with actual result；2. how to eliminate asking for negative effect brought by the property of nano material
Topic, such as the thermal property and optical property of nano material can make the service life reduction of membrane material；3. Nano type blending and modifying film exists
The post-processing problem of caused miniature pollutant after practical application.Thus, it is necessary to which further research film formulation is actually being answered
With it is middle the problem that, eliminate nano material be blend film bring adversely affect, further increase Nano type filter membrane
Overall performance, it is final to promote nano material that membrane technology is blended from theory to practical conversion, improve the extent of spreading amd application of membrane technology.
Summary of the invention
In view of the deficiencies of the prior art, nanometer is blended the object of the present invention is to provide a kind of high-throughput pollution-resistant to change
Property film formulation and preparation method thereof, specific technical solution is as follows:
A kind of high throughput pollution-resistant blending nano modification film formulation, the film formulation is by following raw materials according system in parts by weight
At:
The Kynoar 10-30 of different weight average molecular weight
Solvent 60-85
Pore-foaming agent 5-15
Charged modifying agent 1-10
Nano material 0.5-5
Organic polymer additive 0.5-5
Preferably, the weight average molecular weight of the Kynoar raw material is 45-55 ten thousand, in 55-65 ten thousand, 65-85 ten thousand, 85-100 ten thousand
It is one or two kinds of more than.
Preferably, the solvent is n,N-dimethylacetamide, N-Methyl pyrrolidone, dimethylformamide or dimethyl
One or more of sulfoxide.
Preferably, the pore-foaming agent is one in polyvinylpyrrolidone, polyethylene glycol, lithium chloride or Tween-80
Kind is two or more.
Preferably, the charged modifying agent is sulfonated polyether sulfone (SPES), sulfonated polyether ketone, phenolic polyether sulphone (PES-
C), one or more of polyamide-based and four amine groups type organics, charge coupling agent.
Preferably, the nano material is nano-TiO2, graphene, nanometer Al2O3Or nanometer ZrO2One of or two
Kind or more.
Preferably, the organic polymer additive is that hydrophilic organic polymers, sulfonated bodies, lipophilic-hydrophobic property are organic poly-
Close one of object, polyvinyl alcohol (PVA), polyvinyl butyral (PVB) or other hydrophilic small molecules organic matters or two
Kind or more.
Preferably, the index of the evaluated for film performance formula be film liquid viscosity, film contact angle, membrane aperture distribution, film it is critical
One of flux is several.
Preferably, the effect of the charge coupling agent is surface modified to inorganic nano type blend film, is reduced altogether
The surface energy of mixed film, avoids membrane surface polymer degradation or embrittlement, while making to be blended film surface with charge and anti-pollution
Metachromia.
The present invention has been prepared film and has been faced by the method for the blendings such as charged modifying agent, nano material and polymer material
For boundary's flux within the scope of 50-70LMH, nano modification film is blended in the high-throughput pollution-resistant that practical membrane flux is 30-40LMH, and
And practical application and marketing are successfully carried out.Suitable reference standard value is set in practical application, to performance formula
It tests and adjusts, after multiple actual tests and ratio adjustment, the final film formulation obtained for practical application, and meanwhile it is real
The property retention of Modified Membrane is consistent before and after border.
Preferably, the film formulation is made of following raw materials according in parts by weight:
The Kynoar 21 of different weight average molecular weight
Solvent 63
Pore-foaming agent 6
Charged modifying agent 4
Nano material 1
Organic polymer additive 5
Preferably,
The solvent is DMAC N,N' dimethyl acetamide；
The pore-foaming agent is polyvinylpyrrolidone and two kinds of polyethylene glycol；
The charged modifying agent is sulfonated polyether ketone and polyamide 1:2
The Kynoar is that weight average molecular weight is 45-55 ten thousand and 10,002 kinds of model compositions of 85-100, mixed proportion 1:3.
The ratio of the DMAC/PVDF content is 6.05.
The organic polymer additive is the mixture of sulfonation quasi polymer and polyvinyl butyral, and mixed proportion is
3:1。
Preferably, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, and joint uses
Nano-material modified and charged modifying agent improves the antifouling property of film, so that film contact angle is reduced to 30 ° -60 °, actual membrane operation
Period improves 1.5 times or more than existing film, and the Membrane cleaning period is 3-12 month (specifically related to management mode).With city
For city's sanitary sewage disposal, when film sub-critical pressure approaches the critical flux of the flat plate ultrafiltration membrane, transmembrane pressure increases width
Degree is lower than -20pa/min.
Preferably, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, passes through joint
Using the PVDF raw material of different weight average molecular weight, coupling effect is generated between membrane material, reaches equilibrium membrane flux and film is anti-
The purpose of pollution (or referred to as film water penetration and film hydrophily), the weight average molecular weight of the Kynoar raw material is 45-
550000, one of 55-65 ten thousand, 65-85 ten thousand, 85-100 ten thousand or two or more.Compared with existing film, mentioned in film real fluxes
Under conditions of high 10-30LMH, film contact angle (or the anti-pollution of film blocks up property) reduces 10-20 °.
Preferably, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, by using
The method that mathematical simulation is combined with actual tests is combined on the basis of Guerout-Elford-Ferry model
GaussAmp model in Asymptotic viscograph and statistics has found most suitable raw material dosing ratio and dosing side
Formula, so that the film product for having both superelevation membrane flux and the stifled performance of high anti-pollution be made.It is practical compared with the existing highest level using film
Operating flux improves 10-30LMH, and actual membrane contact angle is 50 ° -70 °, and bovine serum albumin rejection improves 20-30%.
The present invention also provides a kind of high-throughput pollution-resistants, and membrane preparation method is blended, which comprises the following steps:
1) solvent is divided into two parts, takes a small amount of solvent and nano material to mix according to the ratio of 1-20%, and utilize ultrasonic disperse
Equipment disperses 10-30min；
2) pore-foaming agent, charged modifying agent are successively dissolved in a solvent, solution temperature is 40-90 DEG C；By receiving after ultrasonic disperse
Rice material and Kynoar successively dissolve in a solvent, are uniformly mixed；
3) solution obtained is stirred into curing 20-50h, then high temperature deaeration 20-50h, the casting solution after obtaining deaeration；
4) by the casting solution at 5-20 DEG C, under the conditions of air humidity 5-20%, using mechanical knifing on non-woven fabrics.After knifing
Into coagulating bath film-forming, coagulating bath is made of pure water or pure water and ethyl alcohol 1:1-5:1.It is rinsed and is done with pure water after film forming
Only.Polyvinylidene fluoride flat film is made；
5) by the polyvinylidene fluoride flat diaphragm of preparation using 50-80 DEG C of drying, reaction time 2-10min.
Further, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, described for examining
Test the method for film formulation actual effect the following steps are included:
1) film liquid viscosity number is detected, checks whether consistent with lab scale film liquid viscosity, if not meeting, increases solvent dosage, directly
Until film liquid viscosity is consistent, while recording film liquid formula rate adjusted；If film liquid viscosity is consistent, carry out in next step.
2) film liquid striking is formed a film, then detects film thickness, film contact angle, membrane aperture distribution, will test result and lab scale
Comparative result, if the two error is in ± 5% range, then it is assumed that result is consistent, carries out in next step；Think if result is inconsistent
Actual tests failure, continues to test.
3) critical flux for detecting actual membrane, will test result and pilot run compares, if the two error is in ± 5% model
In enclosing, then it is assumed that result is consistent, actual tests success；Think that actual tests fail if result is inconsistent, continues to test.
4) after practical application success, the modification diaphragm of preparation is used for engineering pilot project, trial operation at least six moon, is examined
Examine the stability and using effect of Modified Membrane.
5) in engineering pilot project, the above are up to standard within 6 months for Modified Membrane stable operation.It is through practical film formulation adjusted
The film formulation finally adopted.
Preferably, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, and film uses when welding
One of sweat soldering or ultrasonic bonding.The welding temperature of film and the percentage composition of nano material are related, usual nanometer
The percentage composition of material is higher, and welding temperature is lower.The percentage composition of nano material and the contact angle of blend film and mechanical strength
Correlation further influences the resistance tocrocking and film robustness of film.
Preferably, nano modification film formulation and preparation method thereof is blended in a kind of high-throughput pollution-resistant, which is characterized in that receives
The thermal property and optical property of rice material to the adverse effect and nano modification film of blend film in actual use
The rear problem of miniature pollutant caused by diffusion problem and nano material are spread, passes through charged modifying agent and organic polymer
Object additive is balanced or eliminates.
For membrane modifying technology into practical application conversion process, key problem is that membrane material mixes constant-temperature enclosed reactor
Successful amplification and nanometer slurries ultrasonic disperse reaction kettle successful amplification.So based on successfully industrialization membrane material mixing
The amplification experience of constant-temperature enclosed reactor establishes effective practical methods, the development and practical conversion for membrane modifying technology to pass
It is important.Usual membrane material mixes the amplification of constant-temperature enclosed reactor, and there are two types of methods: experience amplification and mathematics Simulation scale-up step by step.
It is delivered although the mathematical simulation that membrane material mixes constant-temperature enclosed scaling -up has many documents, case history is less.
So in practical application still based on experience amplifying method step by step.Blending nano modification film formulation and its preparation in this patent
Method experienced lab scale research, pilot scale research, industrialization experimental study and engineering pilot project verifying etc. step by step experience amplification
Process finally realizes the practical application of membrane modifying technology.
The beneficial effect of technical solution of the present invention is:
1. the present invention solves the technical issues of high throughput in filter membrane material has both with resistance tocrocking, while realizing film and changing
Property conversion of the technology to practical application, joint acted synergistically on using the method for charged modifying agent and hydrophily blending and modifying agent
Blended membrane material successfully enhances membrane filtration characteristic, has been completed at the same time film surface modification.
2. the present invention provides the practical methods and path with actual production of Modified Membrane, it is determined that examine the practical effect of Modified Membrane
The reference standard value of fruit, makes film formulation realize real practical application, and achieves good economic benefit and social valence
Value.
3. the film formulation in the present invention not only meets the requirement of film properties and water process, while also meeting film liquid tank appearance
Requirement in terms of product, welding procedure, the service life of membrane module installation requirement and diaphragm.The present invention specifies membrane technology to reality
The critical issue that should be noted that in conversion process, while effectively measure is proposed, for further developing new special functional form
The popularization and application of membrane material and membrane technology are of great significance.
4. this invention removes nano material brings in blending type nano modification film to adversely affect, while solving in reality
Nano material diffusion problem present in the application process of border, so, nano material is promoted in the application of water treatment field, is helped
In push membrane technology and MBR technology in the engineer application of environment protection field.
5. the present invention provides for further exploitation features type membrane material with reference to method, while further having widened film
The application field of material.
The Modified Membrane membrane flux that film formulation provided by the invention and preparation method thereof obtains is 30-40LMH, actual motion week
Phase 3-12 month, film properties are excellent, and preparation cost is low, and practical application effect is good.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
A kind of GH Modified Membrane lab scale membrane aperture distribution of high-throughput pollution-resistant blend flat sheet membrane of Fig. 1.
A kind of GH Modified Membrane engineering amplification membrane aperture distribution of high-throughput pollution-resistant blend flat sheet membrane of Fig. 2.
Specific embodiment
The present invention is now illustrated with following embodiment, but is not intended to limit the scope of the invention.Hand used in embodiment
Section uses the means of this field routine unless otherwise instructed.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Nano modification film formulation and preparation method thereof is blended in a kind of high throughput pollution-resistant, includes the following steps:
1. preparing casting solution: taking 1g nano-TiO2It is dissolved in 50gN, in N- dimethyl acetamide (DMAC), utilizes ultrasonic disperse
1h, ultrasonic power 240W.Then it is Kynoar: solvent: pore-foaming agent: charged modifying agent according to weight ratio: nano material=
15:73:6:5:1 prepares casting solution.Pore-foaming agent is made of the polyvinylpyrrolidone that weight ratio is 1:1 and polyethylene glycol, charged
Modifying agent is sulfonated polyether ketone and polyamide, is dissolved in residual solvent respectively, and solution temperature is 80 DEG C；After ultrasonic disperse
Nano material and Kynoar are dissolved in residual solvent, are uniformly mixed；The weight average molecular weight of PVDF material is 450,000 and 65
Ten thousand two types, mixed proportion 1:1.
2. curing deaeration: solution obtained being stirred 48h at 70 DEG C, then high temperature deaeration 30h, the casting after obtaining deaeration
Film liquid.
3. knifing: by the casting solution under the conditions of 25 DEG C, air humidity 50%, being evenly applied to nothing using mechanical knifing
In woven fabric, enter coagulating bath film-forming immediately, coagulating bath is made of pure water and solvent.After film forming in pure water rinsed clean.
4. drying；Polyvinylidene fluoride flat film is dried at 70 DEG C, reaction time 3min.
The film contact angle for measuring PVDF plate membrane is 63 °, reduces about 24% than existing film product.Film pure water flux is
9200LMH, membrane aperture width range is 0.001-0.01 μm, but membrane aperture scatter chart is more dispersed, shows membrane aperture
The uniformity of distribution is poor, as shown in Figure 1.Practical membrane flux reaches 30-35LMH, and film bovine serum albumin rejection is 40%.
Embodiment 2
Other conditions are 550,000 and 850,000 two types, mixed proportion 1:1 with embodiment 1, the weight average molecular weight of PVDF material.
The pure water flux for measuring PVDF plate membrane is 12000LMH；Film contact angle is 65 °, and membrane porosity is than existing film product
25% is improved, membrane aperture width range is 0.015 μm；The GH Modified Membrane is applied in somewhere sanitary sewage disposal project, is adopted
Practical investigation is carried out with plate MBR reactor, measuring film critical flux is 60-65LMH, and the critical flux than existing film product mentions
It is high by about 50%；When the practical membrane flux of holding is 30-40LMH, the plate MBR reactor cleaning frequency be can reach 3-6 months, not sent out
Situation is blocked up in filming dirt.
Embodiment 3
Other conditions do not use charged modifying agent with embodiment 1.
The pure water flux for measuring PVDF plate membrane is 6024LMH；Film contact angle is 73 °, and membrane porosity is than existing film product
10% is improved, membrane aperture remains unchanged.
Embodiment 4
For other conditions with embodiment 1, the weight average molecular weight of PVDF material is 650,000 and only one seed type.
The pure water flux for measuring PVDF plate membrane is 5850LMH；Film contact angle is 70 °.
Embodiment 5
Nano modification film formulation and preparation method thereof is blended in a kind of high throughput pollution-resistant, which is characterized in that described for examining
The method of film formulation actual effect the following steps are included:
1) film liquid viscosity number is detected, checks whether consistent with lab scale film liquid viscosity, if not meeting, increases solvent dosage, directly
Until film liquid viscosity is consistent, while recording film liquid formula rate adjusted；If film liquid viscosity is consistent, carry out in next step.
2) film liquid striking is formed a film, then detects film thickness, film contact angle, membrane aperture distribution, will test result and lab scale
Comparative result, if the two error is in ± 5% range, then it is assumed that result is consistent, carries out in next step；Think if result is inconsistent
Actual tests failure, continues to test.
3) critical flux for detecting actual membrane, will test result and pilot run compares, if the two error is in ± 5% model
In enclosing, then it is assumed that result is consistent, actual tests success；Think that actual tests fail if result is inconsistent, continues to test.
4) after actual tests success, the modification diaphragm of preparation is used for engineering pilot project, trial operation at least six moon, is examined
Examine the stability and using effect of Modified Membrane.
5) in engineering pilot project, the above are up to standard within 6 months for Modified Membrane stable operation.Through practical film formulation adjusted
For the film formulation finally adopted.
The film liquid viscosity of Modified Membrane, film critical flux value and film contact angle values are respectively in practical application: 5000-
8000mpa.s, 50-70LMH and 60 ° -75 °.Meanwhile the membrane aperture width range of Modified Membrane is 0.001-0.01 μm, membrane aperture
Scatter chart integrated distribution shows that membrane aperture distribution is relatively uniform, and the resistance tocrocking of film is stronger, as shown in Figure 2.The Modified Membrane
Uptime in engineering pilot project is 10 months, and the Membrane cleaning period is greater than 3 months, and film real fluxes are 30-
35LMH, MBR effluent quality meet the level-one A standard in " urban wastewater treatment firm pollutant emission standard " GB18918-2002.
Embodiment 6
Nano modification film formulation and preparation method thereof is blended in a kind of high throughput pollution-resistant, which is characterized in that described for examining
The method of film formulation actual effect the following steps are included:
1) film liquid viscosity number is detected, checks whether consistent with lab scale film liquid viscosity, if not meeting, increases solvent dosage, directly
Until film liquid viscosity is consistent, while recording film liquid formula rate adjusted；If film liquid viscosity is consistent, carry out in next step.
2) film liquid striking is formed a film, then detects film thickness, film contact angle, membrane aperture distribution, will test result and lab scale
Comparative result, both discoveries error are greater than ± 5%, then it is assumed that actual tests failure continues to test.
Using the practical application effect of above method detection film formulation, the actual membrane flux range of Modified Membrane is 30-
The actual membrane contact angular region of 40LMH, the practical critical flux range 40-70LMH of Modified Membrane, Modified Membrane are 60-80LMH, are changed
The product qualification rate of property film is generally larger than 98%.Method for examining film formulation actual effect has ensured film formulation from theoretical skill
Successful transition of the art to practical application.
Above embodiment be only preferred embodiments of the present invention will be described, not to the scope of the present invention into
Row limits, and without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical side of the invention
The all variations and modifications that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (9)
1. nano modification film formulation is blended in a kind of high throughput pollution-resistant, which is characterized in that the film formulation is by parts by weight
Following raw materials according be made:
The Kynoar 10-30 of different weight average molecular weight
Solvent 60-85
Pore-foaming agent 5-15
Charged modifying agent 1-10
Nano material 0.5-5
Organic polymer additive 0.5-5.
2. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
The weight average molecular weight of Kynoar raw material is one of 45-55 ten thousand, 55-65 ten thousand, 65-85 ten thousand, 85-100 ten thousand or two kinds
More than.
3. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
Solvent is one or both of DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethylformamide or dimethyl sulfoxide
More than.
4. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
Pore-foaming agent is one or more of polyvinylpyrrolidone, polyethylene glycol, lithium chloride or Tween-80.
5. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
Charged modifying agent is sulfonated polyether sulfone (SPES), sulfonated polyether ketone, phenolic polyether sulphone (PES-C), polyamide-based and four amidos
One or more of group's type organic, charge coupling agent.
6. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
Nano material is nano-TiO2, graphene, nanometer Al2O3Or nanometer ZrO2One or more of.
7. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
Organic polymer additive be hydrophilic organic polymers, sulfonated bodies, lipophilic-hydrophobic property organic polymer, polyvinyl alcohol (
PVA), one or more of polyvinyl butyral (PVB) or other hydrophilic small molecules organic matters.
8. nano modification film formulation is blended in a kind of high-throughput pollution-resistant according to claim 1, which is characterized in that described
The effect of charge coupling agent is surface modified to inorganic nano type blend film, is reduced the surface energy of blend film, is avoided film
Piece surface polymer degradation or embrittlement, while making to be blended film surface with charge and resistance tocrocking.
9. nano modification film formulation preparation method is blended in a kind of high throughput pollution-resistant, which comprises the following steps:
1) solvent is divided into two parts, takes a small amount of solvent and nano material to mix according to the ratio of 1-20%, and utilize ultrasonic disperse
Equipment disperses 10-30min；
2) pore-foaming agent, charged modifying agent are successively dissolved in a solvent, solution temperature is 40-90 DEG C；By receiving after ultrasonic disperse
Rice material and Kynoar successively dissolve in a solvent, are uniformly mixed；
3) solution obtained is stirred into curing 20-50h, then high temperature deaeration 20-50h, the casting solution after obtaining deaeration；
4) casting solution is under the conditions of 5-20 DEG C, air humidity 5-20%, and using mechanical knifing on non-woven fabrics, knifing is laggard
Entering coagulating bath film-forming, coagulating bath is made of pure water or pure water and ethyl alcohol 1:1-5:1, pure water rinsed clean is used after film forming,
Polyvinylidene fluoride flat film is made；
5) by the polyvinylidene fluoride flat diaphragm of preparation using 50-80 DEG C of drying, reaction time 2-10min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110075725A (en) * | 2019-06-04 | 2019-08-02 | 武汉轻工大学 | A kind of preparation method of modified polyvinilidene fluoride film |
| CN110152504A (en) * | 2019-06-17 | 2019-08-23 | 沈阳工业大学 | The polyvinylidene fluoride film and preparation method and application of blending and modifying |
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Application publication date: 20190412 |