Organic-inorganic ultrafiltration composite membrane and preparation method thereof

Abstract

The invention relates to an organic-inorganic ultrafiltration composite membrane and a preparation method thereof. The organic-inorganic ultrafiltration composite membrane comprises the following components in parts by weight: 15-20 parts of polymer resin, silane functionalized graphene oxides, 75-90 parts of N-N dimethyl acetamide and 1-3 parts of polyvinyl pyrrolidone, wherein the silane functionalized graphene oxides account for 0.02%-2.0% of the polymer resin. According to the invention, a membrane preparation process is simple and easy to realize; the silane functionalized graphene oxides are well dispersed to polymeric matrix through ultrasonic and mechanical stirring; the silane functionalized graphene oxides can be well dispersed in the polymeric matrix due to superhigh combination property, superhigh specific surface and more surface long polymer chains between the silane functionalized graphene oxides and the polymeric matrix; in addition, abundant oxygen-containing functional groups positioned on the surfaces of the silane functionalized graphene oxides can well enhance the hydrophilicity of the ultrafiltration composite membrane so as to synergically improve the mechanical property and pollution resistant property of the ultrafiltration composite membrane.

Description

Technical field [0001] The invention belongs to the technical field of functional modification of ultrafiltration membranes, and particularly relates to a silane functionalized graphene oxide modified organic-inorganic ultrafiltration composite membrane and a preparation method thereof. Background technique [0002] As a kind of ultrafiltration membrane material with excellent comprehensive performance, organic polymer has good chemical stability, thermal stability and porosity, but because of its low surface energy and strong hydrophobicity, it is easy to cause surface pollution. Thus seriously affecting the performance of the product. In recent years, in view of the pollution problem of polymer ultrafiltration membranes, the research on its hydrophilic blending modification has gradually been active. The reported modified materials mainly include SiO 2 , Fe 2 O 3 , Al 2 O 3 , TiO 2 And low-dimensional carbon nanomaterials such as oxidized carbon nanotubes and inorganic material...

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Problems solved by technology

Although the use of these materials to modify the polymer ultrafiltration membrane can increase the permeation flux of the membrane and greatly improve the functional performance, however, these methods also have some shortcomings, mainly in: (1) The relationship between the modified material and the polymerization The weak interfacial bonding between the substrates increases the interface defects, resulting in a decrease in the mechanical strength of the modified ultrafiltration composite membrane; (2) due to the lack of abundant functional groups on the surface of the inorganic particles, the particles are prone to agglomeration, which affects the ultrafiltration composite membrane. The performance of the filter composite membrane

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