What is catalyst residue?

Catalyst residue refers to active or partially active catalyst particles remaining in polypropylene after polymerization.

🔹 Main Problems Caused by Catalyst Residue

1. Continuous oxidation reaction

Residual catalyst continues to trigger oxidation even after production.

2. Accelerated aging

It speeds up molecular chain degradation.

3. Color instability

Leads to yellowing and greying of PP fibers.

4. Reduced mechanical properties

Causes brittleness and strength loss over time.

🔹 How to solve catalyst residue problems

• Catalyst deactivation (passivation) system
• Antioxidant synergy system
• Stabilization of molecular structure
• Use of specialized masterbatch solutions

Conclusion

Catalyst residue is a hidden but critical issue in PP processing. Effective neutralization is key to improving product stability and quality consistency.

✅ Blog 3：How to improve PP UV resistance?

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How to Improve UV Resistance of Polypropylene (PP) Products

Intro

Polypropylene is widely used in outdoor applications, but it has relatively weak UV resistance. Without proper stabilization, PP products easily degrade under sunlight exposure.

🔹 Why PP has poor UV resistance

• Polymer chain sensitivity to UV radiation
• Lack of natural chromophores stability
• Photo-oxidation reaction under sunlight

🔹 Key methods to improve UV resistance

1. UV absorbers

Absorb harmful UV radiation and reduce energy impact on polymer chains.

2. Hindered Amine Light Stabilizers (HALS)

Provide long-term protection by inhibiting free radical degradation.

3. Antioxidant system

Prevents thermal-oxidative aging during processing and use.

4. Masterbatch formulation optimization

Balanced additive system ensures long-term stability.

🔹 Application scenarios

• Outdoor PP products
• Geotextiles
• Ropes and nets
• Agricultural materials
• Injection molded outdoor parts

Conclusion

Improving PP UV resistance requires a combination of UV absorbers, HALS, and antioxidant systems to ensure long-term durability in outdoor environments.