A kind of self-assembled hydrophilic polysulfone membrane and its preparation method and application

Abstract

The invention belongs to the technical field of polymer membrane materials, and discloses a self-assembled hydrophilic polysulfone membrane, and a making method and an application thereof The method concretely includes the following steps: 1, dissolving 1-10 parts by weight of a functional blending additive, 5-50 parts by weight of a pore forming agent and 10-100 parts by weight of polysulfone in 100-500 parts by weight of an organic solvent to obtain a membrane casing liquid; 2, dumping the membrane casting liquid onto a glass plate, and striking to uniformity; and 3, allowing the obtained glass plate to stand, immersing the glass plate in a solidification bath to form a membrane, putting the membrane in water for immersion, taking out, and carrying out vacuum drying to obtain a self-assembled hydrophilic polysulfone membrane. The membrane with the membrane surface and membrane pores distributed with hydrophilic functional groups is obtained through a phase transfer method by blending an amphiphilic binary brush with a membrane substrate. The addition of a small amount of the molecular brush in invention effectively improve the hydrophilic effect of the membrane without destroying the structure of the membrane substrate or influencing the use performances of the membrane; and the hydrophilic membrane has stable performances, and can be used in pure water penetration.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane materials, in particular to a self-assembled hydrophilic polysulfone membrane and its preparation method and application. Background technique [0002] Polysulfone (PSF for short) is a kind of thermoplastic resin containing aromatic rings and sulfone groups in the main molecular chain. Polysulfone membranes are resistant to common acids, alkalis, salts, hydrolysis, and aliphatic solvents, and have excellent chemical stability, thermal stability, and mechanical properties, so they are widely used in water treatment, chemical separation, and food Beverage purification, biomedicine and medical fields. [0003] However, due to the hydrophobicity of the polysulfone material, two problems will be encountered in the process of filtering and purifying the aqueous phase medium: First, during the use of the polysulfone filter membrane, due to the hydrophobicity, macromolecular substances such as p...

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Problems solved by technology

[0003] However, due to the hydrophobicity of the polysulfone material, two problems will be encountered in the process of filtering and purifying the aqueous phase medium: First, during the use of the polysulfone filter membrane, due to the hydrophobicity, macromolecular substances such as proteins will be irreversibly produced on the surface. The adsorption of the membrane reduces the permeability of the membrane by more than 30%, causing serious membrane fouling, and the flux can only recover about 70% after cleaning, which seriously limits the practical application of polysulfone membranes.

Second, in the process of filtering the water phase medium, it is necessary to apply a large pressure to make the water pass through the membrane, which increases the power consumption

However, due to the inability to form a strong force between titanium dioxide and polymer materials, the hydrophilicity of the membrane and the sustainability of use cannot be guaranteed.