Preparation method for surface ionization modified polysulfone ultrafiltration membrane

A polysulfone ultrafiltration membrane and ionization technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of increased water flux, reduced membrane flux, and power consumption of blended ultrafiltration membranes Advanced problems, to achieve the effect of reduced contact angle, long-lasting hydrophilicity, and simple operation method

Active Publication Date: 2012-10-31
ZHEJIANG UNIV
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Problems solved by technology

[0004] However, polysulfone material has strong hydrophobicity, and there are two key problems when it is used in the treatment of water media: one is the hydrophobicity of the membrane, so that water needs a higher pressure to pass through the membrane, and the power consumption is high; the other is that the membrane The hydrophobicity of the organic matter and colloid (such as protein) is easy to cause the adsorption of organic matter and colloid (such as protein) on the membrane surface and membrane pores, forming membrane fouling, resulting in a decrease in the flux of the membrane
They can effectively remove pollutants from liquids through the mechanism of electrostatic adsorption; however, since hydrophobic polymers are not compatible with modified polymers, this limits the degree of charge modification and limits the application of membranes in other ways ; Patent CN1110625A discloses a preparation method of polyacrylonitrile-polysulfone blended ultrafiltration membrane, compared with pure polyacrylonitrile membrane or polysulfone membrane, the water flux of the blended ultrafiltration membrane can be greatly increased

Method used

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  • Preparation method for surface ionization modified polysulfone ultrafiltration membrane
  • Preparation method for surface ionization modified polysulfone ultrafiltration membrane

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Embodiment 1

[0043] The weight average molecular weight is 2.5×10 5 The polysulfone (15wt%), the weight average molecular weight is 2×10 5 Polydimethylaminoethyl methacrylate-polysulfone-polydimethylaminoethyl methacrylate triblock copolymer (5wt%) blended with N,N-dimethylacetamide (80wt%), in Stir at 40°C for 36 hours, filter, vacuum degassing, and obtain the casting solution; the casting solution at 30°C passes through a hollow fiber spinning machine to obtain a polysulfone hollow fiber membrane, in which the internal coagulation bath is H 2 O, the temperature is 50°C; the external coagulation bath is H 2 O, the temperature is 40°C, and the dry section distance is 10cm; the obtained polysulfone hollow fiber membrane is immersed in a solution composed of 3-bromopropionic acid (30wt%) and ethanol (70wt%) at 30°C for surface quaternization Treatment, the reaction time is 24 hours; the obtained polysulfone ultrafiltration membrane is washed with 20° C. deionized water for 24 hours, and va...

Embodiment 2

[0045] The weight average molecular weight is 1.0×10 5 The polysulfone (20wt%), the weight average molecular weight is 2×10 4 Polydimethylaminoethyl methacrylate-polysulfone-polydimethylaminoethyl methacrylate triblock copolymer (10wt%) blended with N,N-dimethylformamide (70wt%), in Stir at 60°C for 24 hours, filter and vacuum defoam to obtain the casting solution; the casting solution at 40°C passes through a flat film forming machine with a scraper gap of 50 μm, and the coagulation bath is DMAC / H 2 O (30wt%) mixed solution, the exposure time is 5s, obtains polysulfone flat ultrafiltration membrane; The polysulfone flat ultrafiltration membrane that obtains is immersed in the solution that 5-bromovaleric acid (15wt%) and ethanol (85wt%) form The surface quaternization treatment was carried out at 50°C, and the reaction time was 36 hours; the obtained polysulfone ultrafiltration membrane was washed with 30°C deionized water for 24 hours, and vacuum-dried at 60°C for 8 hours t...

Embodiment 3

[0047] The weight average molecular weight is 5.0×10 5 The polysulfone (10wt%), the weight average molecular weight is 1×10 5 The polydimethylaminoethyl methacrylate-polysulfone-polydimethylaminoethyl methacrylate triblock copolymer (3wt%) was blended with N-methylpyrrolidone (87wt%) and stirred at 90°C For 20 hours, filter, vacuum degassing, and obtain the casting solution; the casting solution at 80°C passes through a flat film forming machine with a scraper gap of 150 μm, and the coagulation bath is H 2 O, and the exposure time was 30s to obtain a polysulfone flat ultrafiltration membrane; the obtained polysulfone flat ultrafiltration membrane was immersed in a solution composed of 3-bromovaleric acid (3wt%) and ethanol (97wt%) at 70 ° C. The surface is quaternized, and the reaction time is 72 hours; the obtained ultrafiltration membrane is washed with 50° C. deionized water for 12 hours, and vacuum-dried for 48 hours to obtain a surface ionized polysulfone ultrafiltration...

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Abstract

The invention discloses a preparation method for a surface ionization modified polysulfone ultrafiltration membrane. The preparation method comprises the following steps: 1) dissolving polysulfone, poly-2-(dimethylamino) ethyl methacrylate- polysulfone-2-(dimethylamino) ethyl methacrylate triblock copolymer into a solvent to obtain casting membrane solution; 2) leading the casting membrane solution to flow through a film forming machine, soaking in a coagulating bath to obtain polysulfone membrane; 3) soaking the polysulfone membrane in bromoacrtic solution to carry out surface quaternization treatment; and 4) cleaning and drying to obtain the surface ionization modified polysulfone ultrafiltration membrane. According to the invention, the polysulfone ultrafiltration membrane is prepared by carrying out solution mixing to poly-2-(dimethylamino) ethyl methacrylate-contained amphipathic block copolymer with polysulfone through an immersion sediment phase conversion method, the membrane surface has anion and cation after the surface quaternization treatment is carried out by the bromoacrtic solution, and the hydrophilcity and anti-pollution capability of the membrane are greatly improved. The preparation method is simple and convenient, mild in modification conditions, obvious in effect and the like, and can prepare high-hydrophilcity, large-flux and anti-pollution polysulfone ultrafiltration membrane.

Description

technical field [0001] The invention relates to a preparation method of a surface hydrophilized modified polysulfone ultrafiltration membrane, in particular to a preparation method of a surface ionized modified polysulfone ultrafiltration membrane. Background technique [0002] Membrane technology is a new type of high-efficiency separation technology, which has the advantages of energy saving, environmental friendliness, and high separation efficiency. It is widely used in water treatment, chemical separation, food and beverage purification, biomedicine, medical treatment and other fields. Membrane materials are the core of membrane technology. The properties of membrane materials directly affect the physical and chemical stability and separation performance of membranes. Commonly used polymer membrane materials mainly include modified cellulose, polyolefin, polysulfone, polyamide, and polycarbonate. , polyacrylonitriles, acrylic copolymers and fluoropolymers. [0003] Pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D69/08B01D69/06B01D67/00
Inventor 朱利平赵翌帆朱宝库徐又一
Owner ZHEJIANG UNIV
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