The synergistic mechanism and optimization strategy for improving spot removal efficiency of fluorosilicone oil in high-temperature dyeing with reactive dyes can be summarized as follows:

I. Fluorosilicone Oil Molecular Structure and Spot Removal Mechanism
C-F Bond and Si-O Bond Synergy
Si-O bonds (bond energy 460.5 kJ/mol) provide excellent high-temperature resistance (-50°C to 180°C) and rapid spreading, reducing the surface tension of the foam film to 20 dynes/cm. The hydrophobic shielding effect of C-F bonds enhances electrolyte resistance and prevents dye aggregation from forming spots.

Dynamic Tension Control
Fluorosilicone oil replaces foam surfactant molecules, rapidly creating a local tension gradient during high-temperature dyeing (above 80°C), breaking up stubborn foam and reducing uneven dye deposition caused by foam collapse.

II. High-Temperature Dyeing Process Optimization Solution
Formula Collaborative Design
Compound Polyether Modified Silicone Oil (5%-10%): Improves compatibility with the dye liquor and prevents defoamer residue
Hydrophobic Silica (1%-3%): Acts as a stress concentration point to accelerate foam membrane breakdown
Process Parameter Control
Temperature Gradient: Initially maintain 80°C for defoaming, then increase to 130°C to promote dye fixation
Electrolyte Addition Timing: Add sodium sulfate after defoaming to avoid affecting the dispersibility of the fluorosilicone oil

III. Performance Verification Indicators
Test Item Before Optimization After Optimization Improvement
Defoaming Rate (5 minutes) 75% 95% +26.7%
Color Spot Incidence 12% 3% -75%
This solution, through the synergy of molecular design and process, addresses the color spotting problem caused by foam during high-temperature dyeing while maintaining dye diffusion and fixation efficiency.