WO2017050019A1 - 一种基于聚乙烯醇凝胶制备网络孔聚偏氟乙烯膜的方法 - Google Patents
一种基于聚乙烯醇凝胶制备网络孔聚偏氟乙烯膜的方法 Download PDFInfo
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- WO2017050019A1 WO2017050019A1 PCT/CN2016/092981 CN2016092981W WO2017050019A1 WO 2017050019 A1 WO2017050019 A1 WO 2017050019A1 CN 2016092981 W CN2016092981 W CN 2016092981W WO 2017050019 A1 WO2017050019 A1 WO 2017050019A1
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- WIPO (PCT)
- Prior art keywords
- film
- polyvinylidene fluoride
- polyvinyl alcohol
- pva
- preparing
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Classifications
-
- 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
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
-
- 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
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- 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
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/08—Specific temperatures applied
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/08—Specific temperatures applied
- B01D2323/082—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/15—Use of additives
- B01D2323/18—Pore-control agents or pore formers
Definitions
- the present invention relates to the field of preparation of polymer film products, and more particularly to a method for preparing a network pore polyvinylidene fluoride film based on a polyvinyl alcohol gel.
- Polyvinylidene fluoride is a thermoplastic fluorine-containing polymer film material with excellent weather resistance and chemical stability. It is not corroded by strong oxidants such as acid and alkali at room temperature, and has high Strength and wear resistance are widely used in industrial, municipal wastewater treatment, medicine, food, gas filtration, molecular transfer technology and other industrial fields, with broad development prospects and market application value.
- Polyvinylidene fluoride is mainly used for microfiltration and nanofiltration in the membrane field, and its preparation processes are mainly non-solvent induced phase separation (NIPS) and thermally induced phase separation (TIPS).
- NIPS non-solvent induced phase separation
- TIPS thermally induced phase separation
- the method utilizes solvent/non-solvent bi-directional diffusion mass transfer between the casting solution and the surrounding environment, so that the originally uniform stable solution becomes unstable, and a phase transition occurs. Phase separation, solidification into a film.
- Polyvinylidene fluoride membranes used in the market are mostly prepared by this method, but this method also has disadvantages, mainly in the formation of finger pores in the pore structure of the membrane, which reduces the mechanical strength and service life of the membrane.
- the thermally induced phase separation (TIPS) method mainly causes phase separation by cooling, forming a pore structure, and the prepared membrane has the advantages of high strength and uniform pore structure of the membrane pore structure, but the method requires high equipment and energy consumption. Larger, more difficult to prepare
- US Patent Nos. 5,022,990 and US 6,297,773 use polyvinylidene fluoride resin mixed with organic liquid and inorganic granules, and melted at a high temperature to form a hollow fiber membrane by molding, etc., to form a three-dimensional network structure, but the addition of inorganic granules It will reduce the mechanical strength of the film, and it is more difficult to extract inorganic pellets later.
- U.S. Patent No. 6,013,688 uses acetone as a solvent to prepare a polyvinylidene fluoride film with good penetration and high porosity by a non-solvent induced phase inversion method.
- the object of the present invention is to provide a polyvinyl alcohol (PVA) gel for preparing a network pore polyvinylidene fluoride (PVDF) film, which solves the problem that the non-solvent induced phase inversion method is easy to generate finger holes in the prior art.
- PVA polyvinyl alcohol
- PVDF network pore polyvinylidene fluoride
- the technical scheme adopted by the present invention is to control the formation conditions of a PVA gel, in which a gel is not formed in a uniform casting solution due to a masking agent (hydrogen bonding formed by masking a hydroxyl group and a solvent in PVA) and high temperature.
- a masking agent hydrogen bonding formed by masking a hydroxyl group and a solvent in PVA
- the PVA gel is formed due to the loss and cooling of the masking agent.
- the PVA three-dimensional network gel solidifies the lean and rich phase formed by the phase separation of the PVDF membrane, and forms an interpenetrating network with the rich phase. Structure, after the phase separation is completed, the PVA gel is removed by a post-treatment process, and finally a PVDF film having a network structure with good pore penetration is formed.
- the main steps include:
- a method for preparing a network pore polyvinylidene fluoride film based on a polyvinyl alcohol gel comprising:
- PVA, a masking agent and a solvent are mixed in a certain mass ratio: 0.5-5%, 1-8%, 30-60%, stirred, and uniformly dissolved by heating at 105 ° C to obtain a PVA solution;
- membrane A is subjected to a post-treatment process to remove the PVA gel to obtain a membrane B;
- PVA, a masking agent and a solvent are first mixed in a certain mass ratio, stirred, and uniformly dissolved by heating at 105 ° C to obtain a PVA solution for masking hydrogen bonds formed by hydroxyl groups and solvents in PVA.
- the effect of adding a masking agent helps to form a uniform casting solution.
- the degree of polymerization of the PVA in the step (1) is 300-2400, and the degree of alcoholysis is OHOO ⁇ .
- the degree of polymerization of the controlled PVA in the present invention is 300-2400, and the degree of alcoholysis is 70%-100%. Because of PVA polymerization Degree > 2400 will affect the mutual solubility of PVA and PVDF. PVA polymerization degree ⁇ 300 will result in insufficient cross-linking degree of PVA. It has been verified by many experiments that PVA of this specification is helpful to form a uniform casting solution. The surface aperture is uniform.
- the masking agent in the step (1) is lithium perchlorate, lithium chloride, lithium nitrate, zinc chloride.
- One or more of calcium chloride One or more of calcium chloride.
- the solvent in the step (1) is formamide, hydrazine, hydrazine-dimethylacetamide, hydrazine, hydrazine-dimethylformamide, hydrazine-methylpyrrolidone, dimethyl sulfoxide.
- the solvent in the step (1) is formamide, hydrazine, hydrazine-dimethylacetamide, hydrazine, hydrazine-dimethylformamide, hydrazine-methylpyrrolidone, dimethyl sulfoxide.
- the PVDF weight average molecular weight in the step (2) is 30-800,000 Daltons, and the intrinsic viscosity is 1.65-1.90.
- the pore forming agent in the step (2) is one of polyethylene glycol, hydroxymethyl cellulose, methyl acrylate, polyvinyl pyrrolidone, inorganic salt, glycerin, octanol Or several combinations.
- the solvent in the step (2) is triethyl phosphate, formamide, hydrazine, hydrazine-dimethylacetamide, hydrazine, hydrazine-dimethylformamide, hydrazine-methylpyrrolidone, One or several combinations of dimethyl sulfoxide.
- the gel bath in the step (3) is one or a combination of a pure hydrogel bath, an isopropyl alcohol/water mixed solution, and a solvent/water mixed solution.
- the post-treatment process in the step (4) is 40-100 ° C pure water immersion treatment 8-36h or 100-5000ppm 30-60 ° C sodium hypochlorite aqueous solution soaking treatment for 2-12h, or the above A combination of the two methods. Soaking with 40-100 ° C pure water is because PVA is easy to swell in water and thus removed; it is treated with 100-5000 ppm of 30-60 ° C sodium hypochlorite aqueous solution because sodium hypochlorite can oxidize PVA, destroy its structure and remove it.
- the sodium hypochlorite aqueous solution is a 30 ° C, 500 ppm sodium hypochlorite aqueous solution.
- the beneficial effects of the technical solution of the present invention are:
- the present invention provides a method for preparing a network pore polyvinylidene fluoride film based on a polyvinyl alcohol gel, and a series of structures are controllable by a simple and feasible method.
- the PVDF film has a cross-sectional structure of an asymmetric membrane with an ultra-thin skin layer and an interpenetrating network pore sub-layer structure, and the hole-to-hole penetration is good.
- the method is simple in operation, saves energy and reduces cost, and the prepared membrane has excellent penetrability between pores, large flux, high mechanical strength, and the like, and can be applied to municipal waste. Water treatment and industrial wastewater treatment.
- Example 1 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 1 of the present invention
- Example 2 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 2 of the present invention
- Example 3 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 3 of the present invention.
- Example 4 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 4 of the present invention.
- Example 5 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 5 of the present invention.
- Example 6 is a cross-sectional scanning electron microscope image of a PVDF film prepared in Example 6 of the present invention.
- the residence time in the air is 10S, then phase separation in a 20°C pure hydrogel bath, and solidified into a film; the obtained film is further immersed in hot water at 100 ° C for 8 hours; finally, the residual solvent is removed to obtain a network pore structure.
- Polyvinylidene fluoride membrane, pure water flux is 374 LMH (lbar, 25 ° C).
- the residence time is 30S, then placed at 30 ° C, phase separation in a pure hydrogel bath, and solidified into a film; the obtained film is further immersed in a 50 ° C NaCIO aqueous solution at 30 ° C for 8 h; finally immersed in pure water to remove residual solvent.
- the polyvinylidene fluoride film of the network pore structure has a pure water flux of 458 LMH (lbar, 25 ° C).
- the aqueous solution of NaCIO in this embodiment may also be 60 ° C, 100 ppm; or 30 ° C, 5000 ppm.
- the soaking day of the aqueous solution of NaCIO in this embodiment may also be 2 hours.
- the residence time is 30S, then phase separation in a 50 °C pure hydrogel bath, and solidified into a film; the obtained film is further immersed in hot water at 60 ° C for 24 h; finally, the residual solvent is removed to obtain a polyfluorinated fluorine of network pore structure.
- the ethylene film has a pure water flux of 547 L MH (lbar, 25. C).
- Phase separation, solidification into film the obtained film is first immersed in 40 ° C hot water for 36h, then immersed in 30 ° C, 500ppm NaClO for 12h; finally remove the residual solvent to obtain a network pore structure of polyvinylidene fluoride film, pure water flux is 682LMH (lbar, 25 ° C).
- the alcohol/hydrogel bath in this embodiment is an isopropanol/hydrogel bath, and other alcohol/hydrogel baths suitable for use in the present invention fall within the scope of the present invention.
- the PVA polymerization degree in the above Examples 1-6 is 300-2400, and the degree of alcoholysis is OHOO ⁇
- the PVDF weight average molecular weight in the above Examples 1-6 was from 30 to 800,000 Daltons, and the intrinsic viscosity was from 1.65 to 1.90.
- the masking agent is preferably lithium chloride, and other such as lithium perchlorate, lithium nitrate, zinc chloride, calcium chloride or a combination thereof are suitable for use in the present invention, and all fall within the present invention.
- lithium chloride and other such as lithium perchlorate, lithium nitrate, zinc chloride, calcium chloride or a combination thereof are suitable for use in the present invention, and all fall within the present invention. The scope of protection.
- the solvent in the above Examples 1-6 is preferably DMSO and DMF, and other such as formamide, hydrazine, hydrazine-dimethylacetamide, hydrazine-methylpyrrolidone, triethyl phosphate or a combination thereof are suitable for use.
- the present invention also falls within the scope of the present invention.
- the pore formers in the above Examples 1-6 are preferably polyvinylpyrrolidone and polyethylene glycol, and others such as hydroxymethylcellulose, methyl acrylate, inorganic salts, glycerol, and octanol are suitable for use in the present invention. Also falls within the scope of protection of the present invention.
- the gel bath in the above embodiments 1-6 is preferably a pure hydrogel bath, an isopropanol / water mixed solution, other alcohol / 7 mixed solution, a solvent / water mixed solution is also suitable for the present invention, also falls It is within the scope of protection of the present invention.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
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Priority Applications (1)
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US15/572,748 US10335741B2 (en) | 2015-09-21 | 2016-08-02 | Method for preparing the network-pore polyvinylidene fluoride membrane based on polyvinyl alcohol gel |
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CN201510605509.3A CN105126648B (zh) | 2015-09-21 | 2015-09-21 | 一种基于聚乙烯醇凝胶制备网络孔聚偏氟乙烯膜的方法 |
CN201510605509.3 | 2015-09-21 |
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PCT/CN2016/092981 WO2017050019A1 (zh) | 2015-09-21 | 2016-08-02 | 一种基于聚乙烯醇凝胶制备网络孔聚偏氟乙烯膜的方法 |
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CN (1) | CN105126648B (zh) |
WO (1) | WO2017050019A1 (zh) |
Cited By (3)
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CN108285202A (zh) * | 2018-04-10 | 2018-07-17 | 天津科技大学 | 一种利用包埋微生物凝胶的平板膜快速挂膜的方法及专用涂布装置 |
CN114053883A (zh) * | 2021-09-10 | 2022-02-18 | 北京赛诺膜技术有限公司 | 一种聚偏氟乙烯中空纤维膜及其制备方法 |
CN115025636A (zh) * | 2021-03-05 | 2022-09-09 | 中国石油化工股份有限公司 | 一种具有双连续高度贯通孔结构的聚合物超滤膜及其制备方法和应用 |
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CN108285202A (zh) * | 2018-04-10 | 2018-07-17 | 天津科技大学 | 一种利用包埋微生物凝胶的平板膜快速挂膜的方法及专用涂布装置 |
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CN115025636A (zh) * | 2021-03-05 | 2022-09-09 | 中国石油化工股份有限公司 | 一种具有双连续高度贯通孔结构的聚合物超滤膜及其制备方法和应用 |
CN115025636B (zh) * | 2021-03-05 | 2023-08-15 | 中国石油化工股份有限公司 | 一种具有双连续高度贯通孔结构的聚合物超滤膜及其制备方法和应用 |
CN114053883A (zh) * | 2021-09-10 | 2022-02-18 | 北京赛诺膜技术有限公司 | 一种聚偏氟乙烯中空纤维膜及其制备方法 |
CN114053883B (zh) * | 2021-09-10 | 2022-11-29 | 北京赛诺膜技术有限公司 | 一种聚偏氟乙烯中空纤维膜及其制备方法 |
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CN105126648B (zh) | 2018-03-09 |
US10335741B2 (en) | 2019-07-02 |
CN105126648A (zh) | 2015-12-09 |
US20180154314A1 (en) | 2018-06-07 |
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