Super-hydrophobic surface with high durability and low ice adhesion and preparation method thereof

Abstract

The invention relates to a super-hydrophobic surface with high durability and low ice adhesion and a preparation method thereof. The surface structure comprises a substrate, micron hillocks, nanowires and polymer connectors, the plurality of micron hills are periodically distributed on the surface of the substrate; a plurality of nanowires are arranged, the nanowires extend out of the surfaces of the micron hillocks, and a plurality of nanowires extend out of the surface of each micron hillock; and the polymer connectors are connected between the adjacent nanowires. In the surface structure, the gaps between the nanowires on the surface of the micron hills are smaller than those between the micron hills, and the polymer connectors are connected between the adjacent nanowires and show a net-shaped structure, so that lower ice adhesion strength can be obtained while the surface hydrophobicity is kept. Meanwhile, in the use process, after a melting and freezing cycle, the nanowires at the top end of the surface structure may be gradually broken and damaged, but the polymer connector can be stored, so that the durability of the surface structure can be effectively improved.

Description

Technical field [0001] The present invention relates to the field of superhydrophobic surface technology, in particular to a superhydrophobic surface with high durability and low ice adhesion and a preparation method thereof. Background [0002] Superhydrophobic surface is a kind of surface that is not easy to dip, and the contact angle of the surface water droplets is greater than 150 ° and the rolling angle is less than 10 °, which is an artificial non-water surface prepared by biomimetic study of the natural lotus leaf surface. Water droplets on superhydrophobic surfaces interact weakly with that surface and are extremely susceptible to rolling off the surface without adhering to or accumulating on the surface. The non-wetting characteristics of the superhydrophobic surface make it have great application value in the fields of self-cleaning, anti-icing, anti-fouling, and drag reduction. [0003] Icing is a common phenomenon in nature, often posing a serious threat to transmiss...

AI Technical Summary

Problems solved by technology

One is that the ice adhesion strength on the surface is still high, so that the ice layer on the surface cannot be separated from the surface in time. It will continue to nucleate and produce new ice on the surface of the ice layer, making the hydrophobic surface useless

The second is that the durability of the super-hydrophobic surface is poor. After mechanical wear, corrosion, fouling and multiple freezing and melting cycles, the hydrophobicity will decrease significantly, resulting in the loss of ice resistance on the surface. At this time, water droplets will be immersed in the micro-nano structure. Icing, causing the ice layer to be pinned in the micro-nano structure, but increasing the ice adhesion strength on the surface

At present, the number of icing and thawing cycles on superhydrophobic surfaces is generally low, generally less than ten times, and it is difficult to achieve a long-term anti-icing effect

The reason for the poor durability of superhydrophobic surfaces is that the micro-nanostructure itself is very fragile and easily damaged, and its low surface energy coating is also easily damaged.

There are some good methods such as laser preparation to improve the micro-nano structure, and the damage of low surface energy coating has become the main problem of low durability.

For example, when fluorosilane is used to modify the micro-nano structure, the fluorosilane is connected to the surface of the micro-nano structure through the hydroxyl group, and only a monomolecular layer can be formed, and the durability of the resulting superhydrophobic surface is poor.

That is to say, the traditional superhydrophobic surface still has the problem that it is difficult to balance low ice adhesion strength and good durability.

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