Color Stability and Process Improvement Techniques in PVC Compounds
Color stability in PVC compositions depends on many factors such as stabilizer type, pigment compatibility, process temperature and plasticizer selection. Color change, burning and surface defects are critical issues for manufacturers.
Color stability in PVC compositions depends on many factors such as stabilizer type, pigment compatibility, process temperature and plasticizer selection. Color change, burning and surface defects are critical issues for manufacturers.
1. Factors Affecting Color
Stability• Stabilizer Selection
Ca-Zn → low yellowing
Organic stabilizer → high transparency
• Pigment Compatibility
Heat-resistant pigments should be selected.
• Plasticizer Compatibility
DOTP → low yellowing
DINP → medium
DOP → high risk of yellowing
2. Process Improvement Methods
Lower process temperature
Homogeneous mixture in extruder
Lubricant optimization
VOC reduction
Stabilizer dosage update
3. Performance Enhancing Additions
UV stabilizers
Anti-plateout additives
Heat resistance developers
Conclusion
The color and performance of the compound can be easily controlled with the right combination of additives.
