CN102626593A - Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof - Google Patents
Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof Download PDFInfo
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- CN102626593A CN102626593A CN201210111120XA CN201210111120A CN102626593A CN 102626593 A CN102626593 A CN 102626593A CN 201210111120X A CN201210111120X A CN 201210111120XA CN 201210111120 A CN201210111120 A CN 201210111120A CN 102626593 A CN102626593 A CN 102626593A
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Abstract
The invention discloses a formula for an acid and alkali-resistant and anti-pollution ultrafiltration membrane and a preparation method thereof. The ultrafiltration membrane is formed by coating a membrane casting liquid consisting of polyvinylidene fluoride, a nano-cellulose crystal and a pore forming agent in a certain mass ratio on a high-strength non-woven fabric substrate and adopting a non-solvent induced phase separation (NIPS) method in a phase conversion method. Due to the presence of a high-strength non-woven fabric support layer, the mechanical strength of the membrane is enhanced. The nano-cellulose crystal contains a hydrophilic group, and an ultrafiltration membrane formed by coblending the nano-cellulose crystal with the polyvinylidene fluoride can be used for overcoming the defects of poor anti-pollution capability and poor hydrophilicity of a pure polyvinylidene fluoride ultrafiltration membrane. The ultrafiltration membrane is resistant to corrosion of acids and alkalis, has high chemical stability, high water flux, high trapping characteristic, high mechanical strength and anti-pollution performance. According to the formula, the acid and alkali corrosion resistance of the membrane is enhanced, and the service life of the ultrafiltration membrane is prolonged.
Description
Technical field
Patent of the present invention relates to prescription of a kind of acid and alkali-resistance antipollution ultrafiltration diaphragm and preparation method thereof; Utilization contains the not mixture film forming of isoplastic macromolecular compound; Improved the hydrophilic performance of unification compound film forming; And utilize the mechanical strength at the bottom of the nonwoven fabric base, improved the mechanical strength of milipore filter, the service life of therefore having improved milipore filter greatly.
Technical background
Membrane separation technique is a kind of novel substituting isolation technics.Along with the development of membrane technology, be applied in life and commercial production field more and more.According to the size of target separate substance, film is divided into micro-filtration membrane, milipore filter, NF membrane and reverse osmosis membrane.
Membrane separation technique is a kind of new separation technology, be meant under the impetus of outside energy or chemical potential difference, by the selection osmosis of film to solute in the mixture separate with solvent, separation process such as classification, purification, enrichment.Membrane separation technique is as a kind of high efficient separation technology of emerging substituted type; Be widely used in chemical industry, weaving, oil, food, medicine; Numerous areas such as environmental protection, electricity, light industry, bioengineering, energy project; Be considered to one of the most rising new and high technology in mid-term 20 end of the centurys to 21 century, even the development of membrane separation technique is called as " industrial revolution for the third time ".
As stated; The milipore filter isolation technics is big type of one in the membrane technology; Be to be motive force with pressure; Utilize the aperture, material surface chemical characteristic etc. of film to make solvent, little molecule solute see through film, and macromolecular substances such as colloid, protein, bacterium, virus are trapped, the separation process that concentrates, thereby realize separating of macromolecular substances and little molecular solvent.Milipore filter is in application process, owing to treat that separated object is different, therefore the working condition of operation also can be different accordingly, all can distinguish to some extent like pretreating process, sterilization technology, the cleaning of film.In order to tackle different membrane process conditions, also different in the practical application to the requirement that becomes membrane material.Milipore filter material commonly used has macromolecular materials such as polysulfones, polyether sulfone, Kynoar, polyacrylonitrile.
In above-mentioned multiple macromolecular material, Kynoar is a kind of important filmogen.The formed milipore filter of Kynoar has physics and chemical stability is good, and with respect to filmogens such as polysulfones, polyether sulfones, the characteristic of its resistance to chemical attack, especially acid-alkali-corrosive-resisting is particularly outstanding, and Kynoar also has the good advantage of film forming characteristics.But Kynoar is owing to itself have a more hydrophobicity group, therefore formed film hydrophobicity strong, when filtered water medium material, cause serious film to pollute easily, cause separative efficiency to descend.Shortcomings such as poor for the hydrophily that overcomes PVDF membrane material itself, easy pollution, people attempt using some physics or chemical method that it is carried out modification.As utilize Al
2O
3, SiO
2, ZrO
2Deng inorganic nano-particle or organic substance the polyvinylidene fluoride (PVDF) ultrafiltration membrane material is carried out study on the modification, the milipore filter of preparing through above method shows excellent serviceability.
The mechanical strength that strengthens milipore filter is particularly important in actual industrial production; Because mechanical strength has determined film, and by service life of film formed membrane module, in actual use; The inefficacy of a lot of film systems and membrane module is not because the inefficacy of film microcosmic strainability causes; But owing to mechanical damage occurs on the diaphragm macroscopic view, thereby causing the inefficacy of membrane module strainability, this point is particularly outstanding on hollow-fibre membrane reaches based on the membrane module of hollow-fibre membrane.Therefore the mechanical performance that improves diaphragm is particularly important to increasing film properties; Milipore filter of the present invention is on the nonwoven matrix, to be coated with casting solution; The mechanical strength of therefore telolemma is decided by the mechanical strength of nonwoven to a great extent, and the mechanical strength of nonwoven is far longer than the intensity of casting solution diaphragm that phase inversion forms.In addition in order to improve the hydrophily of milipore filter; The present invention uses the filler of nano cellulose crystal (nanocrystalline Cellulose) as the milipore filter modification; Nano cellulose crystal extracts formation through specific process from natural fiber, cellulose is one of the abundantest natural polymers of occurring in nature.And nano-cellulose (nanocrystalline cellulose NCC) also is called as the cellulose nanocrystal, is that a kind of diameter is 1～100nm, and length is tens plain to the rigid rod fiber of hundreds of nanometer.Compare with common non-nano cellulose; Because characteristics such as the high-purity of NCC, high-crystallinity, high Young's modulus, high strength; It has shown performances such as high Young's modulus and intensity on material is synthetic; It has lightweight, degradable, bio-compatible and the characteristic such as renewable of biomaterial in addition, makes it in high-performance composite materials, demonstrate great application prospect.A large amount of hydroxyls is contained on the surface of NCC, gives surperficial different characteristic thereby make its surface be easy to chemical modification.Can improve its dispersiveness in the hydrophobic base material through surface modification; Enlarged the range of application of nano-cellulose; Therefore the present invention utilizes the water-wet behavior of nano cellulose crystal to improve the hydrophilicity of polyvinylidene fluoride (PVDF) ultrafiltration membrane, improves the contamination resistance of film.
Summary of the invention
The purpose of this invention is to provide a kind of at the bottom of the high mechanical properties nonwoven interlining coating be high molecular milipore filter prescription of main film forming and preparation method thereof with Kynoar and nano cellulose crystal; This milipore filter has stronger contamination resistance, high water flux and holds back characteristic preferably, and the milipore filter that uses invention to produce has that mechanical strength height, separating property are good, the advantage of long service life.
Formula of casting composition of the present invention is the mixture of Kynoar, nano cellulose crystal, perforating agent, is dissolved into them in the solvent in order at a certain temperature.
The prescription of a kind of acid and alkali-resistance antipollution ultrafiltration diaphragm that the present invention proposes is characterized in that it is that casting solution is coated on the high strength non-woven fabric, and the mass percent of the formula of casting of coating is such as following:
Kynoar: 8～25%
Nano cellulose crystal: 1～10%
Perforating agent: 1～20%
Solvent: 51～87%.
In above-mentioned prescription, the composition of perforating agent is a kind of in lithium chloride (LiCl), polyvinylpyrrolidone (PVP), the polyethylene glycol (PEG) or their mixture.
In above-mentioned prescription, solvent is N, dinethylformamide, N, N-dimethylacetylamide or N-methyl pyrrolidone (NMP).
The preparation method of a kind of acid and alkali-resistance antipollution ultrafiltration diaphragm that the present invention proposes, it is characterized in that: this method comprises following step: 1) system pleurodiaphragmatic in terspace material is carried out preliminary treatment; 2) raw material is mixed the acquisition casting solution with organic solvent; 3) to the casting solution processing that outgases; 4) casting solution is coated on the nonwoven; 5) nonwoven of smearing casting solution is carried out air bath; 6) diaphragm after the air bath carries out coagulation bath; 7) bath of finalizing the design of the diaphragm behind the coagulation bath; Said casting solution Kynoar, nano cellulose crystal, the solution temperature when perforating agent is dissolved in solution are between 30～80 ℃; And drop into raw materials such as Kynoar, nano cellulose crystal, perforating agent successively in order, and fully stirring makes its dissolving.
In above-mentioned preparation method, fully the casting film solution after the dissolving need outgas in 40～100 ℃ of temperature and handle 4～8 hours.
In above-mentioned preparation method, casting solution in the speed that is coated with on the nonwoven between 1～8 meter per second.
In above-mentioned preparation method, behind the nonwoven coating casting solution at needs 10～45 ℃ of 20～120 seconds of hollow gas bath.
In above-mentioned preparation method, in 0～60 ℃ deionized water, be separated coagulation bath 15～30 hours of the diaphragm of accomplishing air bath.
In above-mentioned preparation method, the diaphragm of process inversion of phases need be finalized the design in 50～90 ℃ deionized water and bathed 10～120 minutes.
Kynoar/nano cellulose crystal the composite hyperfiltration membrane of the present invention's preparation has following advantage:
1, the Kynoar/nano cellulose crystal composite hyperfiltration membrane of the present invention's preparation; Through native cellulose polyvinylidene fluoride (PVDF) ultrafiltration membrane is carried out hydrophilically modifiedly, kept the characteristics such as high chemical stability and the erosion of anti-bacterium of polyvinylidene fluoride material, with respect to pure polyvinylidene fluoride (PVDF) ultrafiltration membrane; The present invention is keeping the albumen rejection to reach on 97% basis; It is nearly 40% that the milipore filter water flux improves, and intensity improves a nearly one magnitude, has improved the serviceability of film.
2, the milipore filter of the present invention's preparation has overcome the defective that the polyvinylidene fluoride (PVDF) ultrafiltration membrane hydrophily is poor, be prone to cause the film pollution because cellulosic molecule contains groups such as hydrophilic hydroxyl, significantly improves the hydrophily of milipore filter, and contact angle is less than 50 degree.
3, the milipore filter of the present invention's preparation has stronger contamination resistance and antibacterial ability, because the existence of nonwoven improves mechanical strength greatly, has prolonged the service life of milipore filter.
The specific embodiment
Embodiment 1:
1, get the raw materials ready according to following weight proportion:
2, preparation milipore filter:
1) raw material stoving:
More than several kinds of raw materials (except solvent) 105 ℃ hot-air oven dry handle subsequent use.
2) preparation Kynoar-nano cellulose crystal-LiCl mixed liquor
Kynoar after the oven dry is added in the solvent, and stirring is dissolved Kynoar fully, adds nano cellulose crystal then; Continue to stir and make its dissolving; Continue to add LiCl, stir, obtain Kynoar-nano cellulose crystal-LiCl mixed liquor.
3) the casting solution degassing
---nano cellulose crystal---LiCl mixed liquor places the double-layer vacuum bucket with Kynoar; Use vavuum pump that the vacuum barrel decompression vacuum pumping is outgased; At logical water or the oil of controlling temperature well of double-layer vacuum bucket interlayer; Regulate the viscosity of suitable temperature assurance mixed liquor, accomplish smoothly to guarantee the degassing.Recommendation vacuum is 0.09MPa, and bath temperature is 80 ℃, and the off line time is 6 hours.
4) coating milipore filter
1) casting solution of getting after the degassing places the knifing machine reservoir, and regulates scraper and nonwoven to suitable gap, recommends a 250um.
2) keep scraper motionless, the relative motion that remains a constant speed of the relative scraper of nonwoven, advisory speed is 5 meter per seconds.
3) nonwoven that has been coated with casting solution is at room temperature placed a period of time in air, carries out air bath, and the recommendation time is 45 seconds, and temperature is 25 ℃.
4) the nonwoven entering deionization of filming of accomplishing air bath carries out coagulation bath, and the deionized water temperature is recommended as 25 ℃, and the coagulation bath time is 24 hours.
5) milipore filter after coagulation bath is accomplished gets into the bath of finalizing the design in the high temperature deionized water, and the temperature of typing bath water remains on 65 ℃, and the recommendation time is 45 minutes.
The performance indications of the Kynoar composite hyperfiltration membrane of this examples preparation, testing result is seen table 1.
Embodiment 2:
1) get the raw materials ready according to following weight proportion:
The prescription of this examples preparation film and processing step are except formula of casting and instance 1 said prescription change to some extent, and all the other are identical with instance 1.
The performance indications of the Kynoar composite hyperfiltration membrane of this examples preparation, testing result is seen table 1.
Embodiment 3:
1) get the raw materials ready according to following weight proportion:
The prescription of this examples preparation film and processing step are except formula of casting and instance 1 said prescription change to some extent, and all the other are identical with instance 1.
The performance indications of the Kynoar composite hyperfiltration membrane of this examples preparation, testing result is seen table 1.
Embodiment 4:
1) get the raw materials ready according to following weight proportion:
The prescription of this examples preparation film and processing step are except formula of casting and instance 1 said prescription change to some extent, and all the other are identical with instance 1.
The performance indications of the Kynoar composite hyperfiltration membrane of this examples preparation, testing result is seen table 1.
Reference examples:
Except that casting solution does not add cellulose, blade coating on the glass plate, identical with instance 1.
Table 1 polyvinylidene fluoride nanometer cellulose crystal modification milipore filter performance test results
| Instance 1 | Instance 2 | Instance 3 | Instance 4 | Reference examples | |
| Water flux (L/ (mh)) | 530 | 580 | 540 | 610 | 420 |
| Rejection (%) | 99.2 | 98.9 | 98.5 | 98.9 | 94.3 |
| Porosity (%) | 35.6 | 41.2 | 42.0 | 39.7 | 29.7 |
| Average pore size (nm) | 11.2 | 11.4 | 12.1 | 10.4 | 11.8 |
| Tensile strength (MPa) | 9.6 | 9.3 | 9.7 | 9.3 | 1.3 |
| Hydrophilic angle (degree) | 47 | 46 | 46 | 49 | 87 |
Testing result through table 1 can be known: the Kynoar/nano cellulose crystal composite hyperfiltration membrane (embodiment 1～4) of the present invention's preparation has higher water flux with respect to the milipore filter for preparing in the reference examples, and the water flux of polyvinylidene fluoride nanometer cellulose crystal composite hyperfiltration membrane is reaching 610L/ (mh); Have the excellent protein cutoff performance simultaneously, and protein (cow's serum BSA, 6.7w) rejection reaches more than 98%; Tensile strength is high, reaches more than the 9MPa; Hydrophilicity is good, and contact angle is less than 49 °.
Find out relatively that comprehensively polyvinylidene fluoride nanometer cellulose crystal composite hyperfiltration membrane in contrast to simple Kynoar volume milipore filter and has characteristics such as serviceability excellence, life-span length.
Claims (9)
1. the prescription of an acid and alkali-resistance antipollution ultrafiltration diaphragm is characterized in that it is that casting solution is coated on the high strength non-woven fabric, and the mass percent of the formula of casting of coating is such as following:
Kynoar: 8～25%
Nano cellulose crystal: 1～10%
Perforating agent: 1～20%
Solvent: 51～87%.
2. prescription as claimed in claim 1 is characterized in that: the composition of perforating agent is a kind of in lithium chloride (LiCl), polyvinylpyrrolidone (PVP), the polyethylene glycol (PEG) or their mixture.
3. prescription as claimed in claim 1 is characterized in that solvent is N, dinethylformamide, N, N-dimethylacetylamide or N-methyl pyrrolidone (NMP).
4. the preparation method of an acid and alkali-resistance antipollution ultrafiltration diaphragm, it is characterized in that: this method comprises following step: 1) system pleurodiaphragmatic in terspace material is carried out preliminary treatment; 2) raw material is mixed the acquisition casting solution with organic solvent; 3) to the casting solution processing that outgases; 4) casting solution is coated on the nonwoven; 5) nonwoven of smearing casting solution is carried out air bath; 6) diaphragm after the air bath carries out coagulation bath; 7) bath of finalizing the design of the diaphragm behind the coagulation bath; Said casting solution Kynoar, nano cellulose crystal, the solution temperature when perforating agent is dissolved in solution are between 30～80 ℃; And drop into raw materials such as Kynoar, nano cellulose crystal, perforating agent successively in order, and fully stirring makes its dissolving.
5. preparation method as claimed in claim 4 is characterized in that, fully the casting film solution after the dissolving need outgas in 40～100 ℃ of temperature and handle 4～8 hours.
6. preparation method as claimed in claim 4 is characterized in that: casting solution in the speed that is coated with on the nonwoven between 1～8 meter per second.
7. preparation method as claimed in claim 4 is characterized in that: behind the nonwoven coating casting solution at needs 10～45 ℃ of 20～120 seconds of hollow gas bath.
8. preparation method as claimed in claim 4 is characterized in that: in 0～60 ℃ deionized water, be separated coagulation bath 15～30 hours of the diaphragm of accomplishing air bath.
9. preparation method as claimed in claim 4 is characterized in that: need in 50～90 ℃ deionized water, finalize the design through the diaphragm of inversion of phases and bathe 10～120 minutes.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174304A (en) * | 2014-09-12 | 2014-12-03 | 天津工业大学 | Preparation method for anti-pollution PVDF (polyvinylidene fluoride) separation film |
| CN106345316A (en) * | 2016-10-13 | 2017-01-25 | 潍坊学院 | Anti-sour corrosion micro-pore filter membrane |
| CN106582313A (en) * | 2017-02-22 | 2017-04-26 | 广东斯乐普环保技术股份有限公司 | Double-layer alkali-resisting separation membrane support material and preparing method thereof |
| CN108654395A (en) * | 2018-05-16 | 2018-10-16 | 南京帝膜净水材料开发有限公司 | A kind of formula and preparation method thereof of preparation of anti-fouling ultrafiltration membrane piece |
| CN109647228A (en) * | 2018-12-26 | 2019-04-19 | 天津大学 | The polychloroethylene blended ultrafiltration membrane of lignin-and preparation method |
| CN112206661A (en) * | 2020-11-03 | 2021-01-12 | 波塞冬(江苏)新材料科技有限公司 | Polyvinylidene fluoride-based nano composite ultrafiltration membrane and preparation method thereof |
| CN112791604A (en) * | 2021-01-27 | 2021-05-14 | 泉州师范学院(石狮)生态智能织物工程技术研究院 | Bamboo raw powder/modified polyvinylidene fluoride composite membrane and preparation method and application thereof |
| CN115093055A (en) * | 2022-07-14 | 2022-09-23 | 重庆海通环保科技有限公司 | Reverse osmosis membrane coating and reverse osmosis membrane body suitable for strong acid solution |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430082B1 (en) * | 1989-11-30 | 1996-06-19 | Millipore Corporation | Porous membrane formed from an interpenetrating polymer network having hydrophilic surface |
| CN1621140A (en) * | 2004-10-12 | 2005-06-01 | 浙江大学 | Method for preparing polyvinylidene fluoride flat plate microporous compound film |
| CN101703897A (en) * | 2009-11-13 | 2010-05-12 | 中钢集团武汉安全环保研究院有限公司 | Preparation method of polyvinylidene fluoride (PVDF) ultrafiltration membrane with improved permeability |
| CN101711952A (en) * | 2009-12-22 | 2010-05-26 | 济南大学 | Polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilcity and preparation method thereof |
| CN102179189A (en) * | 2011-04-01 | 2011-09-14 | 河北科技大学 | Preparation method of pollution-resisting polyvinylidene fluoride ultrafiltration membrane |
-
2012
- 2012-04-13 CN CN201210111120.XA patent/CN102626593B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430082B1 (en) * | 1989-11-30 | 1996-06-19 | Millipore Corporation | Porous membrane formed from an interpenetrating polymer network having hydrophilic surface |
| CN1621140A (en) * | 2004-10-12 | 2005-06-01 | 浙江大学 | Method for preparing polyvinylidene fluoride flat plate microporous compound film |
| CN101703897A (en) * | 2009-11-13 | 2010-05-12 | 中钢集团武汉安全环保研究院有限公司 | Preparation method of polyvinylidene fluoride (PVDF) ultrafiltration membrane with improved permeability |
| CN101711952A (en) * | 2009-12-22 | 2010-05-26 | 济南大学 | Polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilcity and preparation method thereof |
| CN102179189A (en) * | 2011-04-01 | 2011-09-14 | 河北科技大学 | Preparation method of pollution-resisting polyvinylidene fluoride ultrafiltration membrane |
Non-Patent Citations (1)
| Title |
|---|
| 白浩龙等1: "聚偏氟乙烯/纳米纤维素复合超滤膜的研究", 《现代化工》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174304A (en) * | 2014-09-12 | 2014-12-03 | 天津工业大学 | Preparation method for anti-pollution PVDF (polyvinylidene fluoride) separation film |
| CN106345316A (en) * | 2016-10-13 | 2017-01-25 | 潍坊学院 | Anti-sour corrosion micro-pore filter membrane |
| CN106345316B (en) * | 2016-10-13 | 2017-10-13 | 潍坊学院 | A kind of miillpore filter of acid-resisting corrosion |
| CN106582313A (en) * | 2017-02-22 | 2017-04-26 | 广东斯乐普环保技术股份有限公司 | Double-layer alkali-resisting separation membrane support material and preparing method thereof |
| CN108654395A (en) * | 2018-05-16 | 2018-10-16 | 南京帝膜净水材料开发有限公司 | A kind of formula and preparation method thereof of preparation of anti-fouling ultrafiltration membrane piece |
| CN109647228A (en) * | 2018-12-26 | 2019-04-19 | 天津大学 | The polychloroethylene blended ultrafiltration membrane of lignin-and preparation method |
| CN112206661A (en) * | 2020-11-03 | 2021-01-12 | 波塞冬(江苏)新材料科技有限公司 | Polyvinylidene fluoride-based nano composite ultrafiltration membrane and preparation method thereof |
| CN112791604A (en) * | 2021-01-27 | 2021-05-14 | 泉州师范学院(石狮)生态智能织物工程技术研究院 | Bamboo raw powder/modified polyvinylidene fluoride composite membrane and preparation method and application thereof |
| CN115093055A (en) * | 2022-07-14 | 2022-09-23 | 重庆海通环保科技有限公司 | Reverse osmosis membrane coating and reverse osmosis membrane body suitable for strong acid solution |
| CN115093055B (en) * | 2022-07-14 | 2023-10-31 | 重庆海通环保科技有限公司 | Reverse osmosis membrane coating and reverse osmosis membrane body suitable for strong acid solution |
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