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Preparation method of high-performance ultrafiltration membrane

An ultrafiltration membrane, a high-performance technology, applied in the field of membrane separation, can solve the problems of reducing the cut-off performance and membrane strength of the ultrafiltration membrane, and cannot significantly affect the permeation flux of the membrane, so as to facilitate the adjustment of the membrane surface pore size and the membrane surface pore size. Uniform distribution and reduced usage

Pending Publication Date: 2021-08-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the separation performance of the membrane is mainly related to the structure of the membrane surface porosity and surface pore size. The increase of the bulk porosity does not significantly affect the permeation flux of the membrane, and even reduces the retention performance and membrane strength of the ultrafiltration membrane.

Method used

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  • Preparation method of high-performance ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The sulfonated polysulfone (SPSf) of the PES of 4.2g, 0.8g (SPSf) is dissolved in the DMAC solvent of 20g and is formulated into casting solution (film-forming polymer accounts for 20wt% of casting solution gross mass), then to this casting solution Add 2.25g of H in 2 O (accounting for 9wt% of the total mass of the casting solution), 6g of PEG (accounting for 24wt% of the total mass of the casting solution), 0.0125g of CaCO with a particle size of 20nm 3 Particles (accounting for 0.05wt% of the total mass of the casting solution). Mix evenly at 70°C, stir mechanically for 8h and stand at 70°C for 24h and vacuum defoam to obtain a homogeneous casting solution. The scraped 200 μm liquid film was quickly immersed in an aqueous coagulation bath with a pH of 0.5 prepared by hydrochloric acid for phase inversion. After 5 minutes, the base film was taken out and placed in deionized water for storage. The pure water flux and BSA (1000ppm) rejection rate were tested at 0.1MPa...

Embodiment 2

[0035]The sulfonated polysulfone (SPSf) of the PES of 4.2g, 0.8g (SPSf) is dissolved in the DMAC solvent of 20g and is formulated into casting solution (film-forming polymer accounts for 20wt% of casting solution gross mass), then to this casting solution Add 6g of PEG (accounting for 24wt% of the total mass of the casting solution), 0.125g of CaCO with a particle size of 20nm 3 Particles (accounting for 0.5wt% of the total mass of the casting solution). Mix evenly at 25°C, stir mechanically for 8 hours, and stand at 25°C for 24 hours for vacuum defoaming to obtain a homogeneous casting solution. The scraped 100 μm membrane was quickly immersed in a coagulation bath of an aqueous solution with a pH of 2 prepared by hydrochloric acid for phase inversion. After 5 minutes, the basement membrane was taken out and placed in deionized water for storage. The pure water flux and BSA (1000ppm) rejection rate were tested at 0.1MPa, and the pore size and surface porosity were tested aft...

Embodiment 3

[0037] The PVDF of 3.0g is dissolved in the NMP solvent of 22.0g and is mixed with casting solution (film-forming polymer accounts for 12wt% in casting solution), then in this casting solution, add the methyl alcohol of 1.25g (accounting for casting solution total 5wt% of the mass), 6g of PEG (accounting for 24wt% of the total mass of the casting solution), 0.025g of MgCO with a particle size of 120nm 3 Particles (accounting for 0.1wt% of the total mass of the casting solution). Mix evenly at 50°C, mechanically stir for 8h and stand at 50°C for 24h to defoam to obtain a homogeneous casting solution. The film scraped to 300 μm was quickly immersed in an aqueous coagulation bath with a pH of 6 prepared by acetic acid for phase inversion. After 30 minutes, the base film was taken out and stored in deionized water. The pure water flux and BSA (1000ppm) rejection rate were tested at 0.1MPa, and the pore size and surface porosity were tested after the membrane was freeze-dried. The...

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Abstract

The invention relates to a preparation method of a high-performance ultrafiltration membrane, which comprises the following steps: (1) adding a certain amount of a membrane-forming polymer into a certain amount of a solvent, fully dissolving the membrane-forming polymer at 25-70 DEG C to obtain a membrane casting solution, and adding a pore-foaming agent into the membrane casting solution and fully dissolving the pore-foaming agent; dispersing nano foaming particles in a solvent, ultrasonically dispersing for 10-30 minutes, adding the nano foaming particles into the membrane casting solution, continuing to stir at 25-70 DEG C to form a uniform solution, and performing vacuum defoaming at 25-70 DEG C for 24 hours; (2) coating the surface of a supporting membrane with the membrane casting solution to form a liquid membrane with a certain thickness, and naturally evaporating the liquid membrane in an air atmosphere for 10-60 seconds; (3) immediately putting the liquid membrane into an acidic aqueous solution coagulating bath, carrying out phase conversion to form a membrane, and completing phase conversion to form the membrane after 1-5 minutes, so as to obtain an ultrafiltration membrane; and (4) putting the obtained ultrafiltration membrane into distilled water or glycerol for preservation.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a high-performance ultrafiltration membrane with high surface porosity. Background technique [0002] Ultrafiltration is a membrane separation technology between microfiltration and nanofiltration. The ultrafiltration membrane is generally composed of an ultra-thin skin layer with a certain microporous structure on the surface and a porous support layer, often with an asymmetric structure. The epidermis has a separation function, and the support layer is mostly a sponge or finger-like hole structure to provide mechanical strength. Common separation membranes include flat sheet membranes, hollow fiber membranes, and tubular membranes. Today's commercial ultrafiltration membranes have low surface porosity (<10%) and a large pore size distribution range, which cannot combine high permeability and high selectivity. Therefore, the preparation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/68B01D71/34
CPCB01D67/0002B01D67/0011B01D67/0013B01D71/34B01D71/68
Inventor 何本桥王升欢高蔓彤崔振宇李建新纪艳红赵瑞
Owner TIANJIN POLYTECHNIC UNIV
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