The synergistic defoaming mechanism of C-F and Si-O bonds in the molecular structure of fluorosilicone oil can be analyzed from the following multiple dimensions:

1. Molecular Structural Characteristics
‌Si-O Bond Stability‌
The Si-O bond energy is as high as 460.5 kJ/mol, endowing fluorosilicone oil with excellent heat resistance (-50°C to 180°C) and chemical inertness. Its low surface tension (approximately 20 dynes/cm) enables the molecules to quickly spread to the foam surface, disrupting the stability of the liquid film.
‌Shielding Effect of C-F Bonds‌
The short C-F bond length and the strong electron-withdrawing properties of the fluorine atom provide shielding protection for the Si-O backbone, enhancing solvent resistance while reducing intermolecular forces and improving fluidity.

2. Synergistic Defoaming Pathway
Surface Tension Control
The low surface tension dominated by Si-O bonds enables fluorosilicone oil to quickly penetrate the foam film. The hydrophobicity of C-F bonds further reduces local surface tension, creating a tension gradient that causes the film to rupture.
Membrane Elasticity Destruction
The rigid structure of C-F bonds inhibits the self-healing ability of the film, while synergistically accelerating film drainage and gas diffusion with the flexibility of Si-O bonds.
Chemical Adaptability
The combination of the acid and alkali resistance of Si-O bonds and the oil resistance of C-F bonds enables fluorosilicone oil to maintain its defoaming activity in complex systems.

3. Application Advantages
High Efficiency: Synergistic effects increase defoaming efficiency by 30%-50% compared to traditional silicone oils, allowing usage to be as low as 0.1-5 phr.
Broad Spectrum: Applicable to both water-based and oil-based systems, covering a wide range of applications, including coatings, textiles, and food.
This mechanism optimizes physical and chemical defoaming performance through molecular design, making it a highly efficient and environmentally friendly solution for modern industry.