Introduction
PVC (polyvinyl chloride), a key commodity plastic, is widely used in building materials, pipes, and electrical cables. Stearic acid and its metal salts play a critical role in PVC processing.
Mechanism of action of calcium stearate
1. Thermal stabilization
Calcium stearate absorbs HCl released during PVC decomposition, inhibiting autocatalytic degradation.
2. Lubrication
Improves PVC melt flow, reduces processing torque, and boosts production efficiency.
3. Synergy
Used in combination with zinc stearate to achieve synergistic effects and enhance overall performance.
Recipe Suggestions
PVC Pipe Formulation
PVC 树脂：100 份
硬脂酸钙：0.8-1.2 份
硬脂酸锌：0.2-0.4 份
其他助剂：适量Important Notes
Excessive calcium stearate usage can compromise transparency.
Recommended ratio of zinc stearate is 3:1 to 4:1.
Mix thoroughly to avoid local over-concentration.
Conclusion
Proper use of calcium stearate can significantly enhance the thermal stability, processability, and surface quality of PVC products.