Overview

In coating technology, hydrophobic and hydrophilic angles are key indicators for evaluating the surface properties of coatings. These angles reflect the wetting behavior of water on the material surface, which directly influences their applications in waterproofing, self-cleaning, lubrication, and coating fields.

Definitions of Hydrophobic and Hydrophilic Angles
The hydrophobic angle, also known as the water contact angle (WCA), measures the angle formed by a water droplet on the coating surface. If the angle exceeds 90°, the coating is considered hydrophobic; if it surpasses 150°, it is classified as superhydrophobic. Conversely, hydrophilic angles are defined when the contact angle is less than 90°, and surfaces with angles close to 0° are termed superhydrophilic.

Principles of Hydrophobicity and Hydrophilicity
Hydrophobicity relies on the coating's low surface energy and micro-rough structures, which effectively reduce the contact area between water and the surface, causing water droplets to form spherical shapes and roll off. Hydrophilicity, on the other hand, is achieved through high surface energy and smooth surfaces that allow water to spread and wet the material effectively.

Application Scenarios

1. Hydrophobic Coating Applications

   • Waterproof Protection: Used on building materials and electronic devices to prevent moisture penetration.
   • Self-Cleaning Functionality: Applied to surfaces like glass and solar panels, where rolling water droplets remove dust and dirt.

2. Hydrophilic Coating Applications

   • Anti-Fog Treatment: Prevents water vapor from forming small droplets on surfaces such as windshields and mirrors.
   • Enhanced Wetting: Improves adhesion and coating performance in medical devices and painting industries.

Influencing Factors
The size of hydrophobic and hydrophilic angles is affected by the chemical composition, surface roughness of the coating material, and environmental conditions. Therefore, surface properties need to be tailored according to specific application requirements.

Conclusion
Hydrophobic and hydrophilic angles are crucial indicators of coating performance. Their design and optimization offer broader possibilities for technical applications across different fields. Adjusting surface properties can enable functions such as waterproofing, anti-fouling, and wetting enhancement.

Disclaimer
This article is based on publicly available information and is for reference and discussion purposes only. For specific technical support or application advice, please consult relevant professionals.