Preparation method of large-area super-hydrophobic flexible membrane

Abstract

The invention discloses a preparation method of a large-area super-hydrophobic flexible membrane, and relates to a highly-hydrophobic flexible membrane. Microchannel arrays are prepared on a silicon chip with a micromachining method; the silicon chip provided with the microchannel arrays is assembled in a mold bottom plate; a release agent and a PVDF (polyvinylidene fluoride) emulsion are sprayed on the surface of the silicon chip, a PDMS (polydimethylsiloxane) glue solution is poured into the mixture, and vacuumizing and procuring are performed; chemical grafting treatment is performed in the oxygen environment at the set temperature; after chemical grafting treatment is completed, the large-area super-hydrophobic flexible membrane is obtained through extraction from a mold. Through micro-molding, the microchannel arrays on the silicon chip are transferred to PVDF polymer with low surface energy, the super-hydrophobic flexible membrane with a general contact angle of 145 degrees is obtained, PVDF and PDMS composite layers are firmly combined through chemical grafting treatment, and the membrane has better mechanical strength. A randomly bent flexible membrane can be formed by the obtained membrane.

Description

technical field [0001] The invention belongs to the technical field of surface chemistry, and relates to a strong hydrophobic flexible film, in particular to a preparation method of a large-area strong hydrophobic flexible film with a micro-nano structure. Background technique [0002] A strongly hydrophobic surface refers to a surface whose contact angle with water is greater than 140° and the rolling angle is less than 10°. The surface of the lotus leaf has strong hydrophobic properties, and the contact angle and rolling angle of water droplets on the surface of the lotus leaf are 161.0±2.7° and 2°, respectively. Such a strong hydrophobicity makes the surface of the lotus leaf produce a self-cleaning effect. When the rain falls on the surface of the leaf, it will easily roll off, and at the same time take away the dirt to realize the self-cleaning of the surface. This self-cleaning function is called "lotus leaf effect". By imitating the lotus leaf effect, controlling re...

AI Technical Summary

Problems solved by technology

Silicon wafer is a rigid material, which is not easy to bend, which makes it difficult for the strong hydrophobic substrate made of silicon wafer to be suitable for industrial products such as aluminum-based, copper-based, and woven fabrics with curved surfaces.

[0007] There are many related technologies for preparing small-area strongly hydrophobic materials or films based on micro-processing technology, but the difficulty lies in whether similar strongly hydrophobic materials or films can be used in large areas, and whether they can be applied to industrial products with different substrates and shapes. Whether relevant technologies can be transferred to industrialization feasibly, related issues still need further research and exploration

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