Film with oil-water separation tapered needle array having underwater oleophilic property on surface as well as preparation method and use of film

Abstract

The invention belongs to the technical field of function materials, and particularly relates to a film with an oil-water separation tapered needle array having an underwater oleophilic property on a surface as well as a preparation method and the use of the film. The preparation method of the film comprises the following steps of: taking a high-density polyethylene sheet as a substrate, carrying out arraying punching on the surface of the substrate by tapered stainless steel needles having ridge-shaped coarse structures on the surfaces obtained in a sanding way, shaping by polydimethylsiloxane, and building a tapered needle array which is made from the polydimethylsiloxane and has an oil-water separation action on the surface of a polydimethylsiloxane film. The surface of each tapered needle in the tapered needle array has the ridge-shaped coarse structure which has the submicron scale width and the nanoscale width and is along the axial direction of each tapered needle, and the distances among the adjacent tapered needles is micrometer scale, so that the film with the oil-water separation tapered needle array having the underwater oleophilic property on the surface, which can continuously carry out the oil-containing wastewater oil-water separation, is obtained.

Description

Technical field [0001] The invention belongs to the technical field of functional materials, and particularly relates to an oil-water separation tapered needle array membrane with underwater lipophilic properties on the surface, and a preparation method and application thereof. Background technique [0002] Oily wastewater is very harmful to the environment and life. With the development of the chemical industry and the petroleum industry, the discharge of oily wastewater into the environment has increased year by year, seriously endangering human health and safety; accidents such as crude oil leakage will also seriously threaten Ecological balance; therefore, how to find a cost-effective oil-water separation method has become a topic of widespread concern for researchers. [0003] CN1387932A, CN1721030A and CN101518695A separate oil-water separation nets with hydrophobic and lipophilic functions. Although these technical solutions have the effect of oil-water separation, they also...

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Problems solved by technology

[0003] In CN1387932A, CN1721030A and CN101518695A, oil-water separation nets with hydrophobic and lipophilic functions were separated respectively. Although these technical solutions all have the effect of oil-water separation, they also have obvious disadvantages, such as complicated process, use of fluorine-containing compounds, etc., but the most The important disadvantage is that in these oil-water separation methods, the oil-water mixture has been separated before separation. Even if these methods are not used, the oil-water mixture will automatically separate after a period of time. These oil-water separation methods It only speeds up the progress of this process; however, in practical applications, a large part of the oil droplets in oily wastewater are micron-sized oil droplets, and these tiny oil droplets will not be affected by phase separation and separation after standing for a long time. Layer effect, difficult to separate from water with existing methods

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