Color Stability and Process Improvement Techniques in PVC Compounds

Color stability in PVC compounds; It depends on many factors such as stabilizer type, pigment compatibility, processing temperature and plasticizer selection. Color change, burning and surface defects are critical problems for manufacturers.

1. Factors Affecting Color Stability

• Stabilizer Selection

Ca-Zn → low yellowing
Organic stabilizer → high transparency

• Pigment Compatibility

Heat resistant pigments should be chosen.

• Plasticizer Compatibility

DOTP → low yellowing
DINP → medium
DOP → high risk of yellowing

2. Process Improvement Methods

• Lower process temperature

• Homogenous mixture in the extruder

• Lubricant optimization

• VOC reduction

• Stabilizer dosage update

3. Performance Enhancing Additions

• UV stabilizers

• Anti-plateout additives

• Heat resistance enhancers

Result

The color and performance of the compound can be easily controlled with the right additive combination.