PVC Stabilizer Errors and Solution Methods

Stabilizer selection and dosage are critical in PVC production. Incorrect use of stabilizers can lead to problems such as discoloration, burning, plaque formation, odor and mechanical performance decrease.

1. Common Stabilization Problems

1) Yellowing / Discoloration

Reasons:

• Low dosage of stabilizer

• Incorrect Ca-Zn rate

• Long stay at high temperature

• Unsuitable lubricant

Solution:

• Optimize Ca-Zn or organic stabilizer dosage

• Lower process temperatures

• Revise lubricant system

2) Plaque Formation (Plate-out)

Reasons:

• Low heat stability

• Volatile component it is too much

• Lubricant incompatibility

Solution:

• Ca-Zn mixtures with higher stability

• Modified lubricant systems

• Low volatility plasticizers

3) Odor and Gas Outlet

Reasons:

• Incompatible plasticizer

• Insufficient stabilization

• Low purity raw materials

Solution:

• More stable systems such as DOTP / TOTM

• Stabilizers with low VOC levels

• Purer PVC resin

4. Loss of Mechanical Performance

• Excessive stabilizer → brittleness

• Incomplete stabilizer → softening, weakening

Conclusion

PVC stabilization problems can be easily eliminated with the right choice of stabilizer and process controls.