DSAN Biomimetic Superhydrophobic and Oleophobic Coating
I.Basic Overview of Hydrophobic and Oleophobic Coatings
Based on the bionic superhydrophobic self-cleaning principle inspired by the"lotus leaf effect,"DSAN coating is achieved through the reactive modification of inorganic nanoparticles with low-surface-energy substances and the construction of micro-nano rough structures.It features multiple functions,including superhydrophobicity,ultra-self-cleaning,hydrophobic migration,delayed icing,and easy de-icing.This effectively prevents the formation of water films on equipment surfaces.Even in high-humidity environments,it maintains its superhydrophobic properties,ensuring that the surface lacks discharge channels caused by condensation.
II. Features of Hydrophobic and Oleophobic Coatings
1.Superhydrophobicity:Features a contact angle of≥160°and a sliding angle of＜2°.Water droplets easily roll off the surface,and the coating maintains its superhydrophobic state even after being immersed in water for over 60 days.
2.Superoleophobicity:Effectively prevents flashovers and dielectric breakdowns caused by oil stains such as bird droppings.
3.Ultra-Self-Cleaning:Resists dust accumulation with a self-cleaning rating of Level 1.In heavily polluted environments,accumulated ash rapidly shrinks upon contact with water,preventing the formation of dry zones that could trigger flashover discharges.
4.Excellent Superhydrophobicity in High-Humidity Environments:Maintains a contact angle of≥150°and a sliding angle of＜5°at 99%relative humidity,ensuring liquid droplets do not adhere to the substrate.It effectively prevents the formation of water films on surfaces.Regardless of environmental changes,as long as discharge channels caused by condensation are eliminated,the operational reliability of the equipment can be significantly enhanced.
5.Outstanding Adhesion:Achieves a Level 1 adhesion rating on glass,ceramics,stone,aluminum plates,and various conventional coatings.
6.Exceptional Weather Resistance:Incorporates fluorinated compounds,enabling the coating to delay icing,reduce ice accumulation,and facilitate easy de-icing in natural environments.Its resistance to UV aging far surpasses that of general materials.
III. Application Scope of Hydrophobic and Oleophobic Coatings
Power Grids: Transmission lines, power towers, various types of insulators, and insulating pillars/bushings.
Wind Power & New Energy: Wind turbine blades.
IV. Comparison of Hydrophobic and Oleophobic Coatings (as shown in the figure below)
V. Advantages of Hydrophobic and Oleophobic Coatings
1.Mitigates Partial Discharge: The superhydrophobic surface prevents localized partial discharges caused by water droplet distortion, which generate corrosive gases such as O3, NO, and NO2. This significantly reduces the corrosion of insulating materials and metals, thereby greatly enhancing the anti-pollution flashover capability of the external insulation in power grids. It effectively protects the grid against damage from pollution, condensation, freezing rain, and ice/snow disasters.
2.Bionic Anti-Rust Protection: By mimicking the microstructure of lotus leaves, the coating creates an air cushion that blocks direct contact between water and the substrate, making it highly difficult for the base material to rust.
3.Dense Primer Barrier: The dense primer layer effectively isolates oxygen from contacting the metal surface.
4.Strong Acid Resistance: Effectively resists the erosion caused by acid rain.
5.Excellent Salt Spray Resistance: Provides outstanding protection against high-salt coastal climates.
6.User-Friendly Application: Easy to apply and can be directly used on aging or existing equipment.
7.Comprehensive Dielectric & Corrosion Prevention: Effectively prevents dielectric breakdowns triggered by condensation, salt spray, bird droppings, ice disasters, and oil stains. It also prevents metal corrosion and stops "creepage" (tracking) on insulators.
VI. Application Cases of Hydrophobic and Oleophobic Coatings
Selibuya 110kV Substation, Xinjiang Jiangnan Power Supply Co., Ltd., State Grid: Anti-pollution flashover protection.
Qingshui 110kV Substation, Hengyang Power Supply Company, Hunan Electric Power Corporation: Protection against heavy pollution such as cement dust.
Jianli Power Supply Company, Hubei Electric Power Corporation: Prevention of bird droppings contamination.
Shanping 220kV Substation, Duyun Power Supply Bureau, Guizhou Electric Power Corporation: Anti-moss treatment.
A 10kV Distribution Network Line in a Coastal Area of Fujian Province.
Disconnector Insulators at Suidong Converter Station (±800kV).
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