Choosing the appropriate anti-oxidant masterbatch is crucial for ensuring the long-term durability, thermal stability, and performance of your plastic products. Here are the key factors to consider:
1. Understand the Polymer Type
Different polymers degrade differently under heat and oxidation.
- Polyethylene (PE) and Polypropylene (PP): Require primary antioxidants (e.g., hindered phenols) and secondary antioxidants (e.g., phosphites) to prevent thermal oxidation.
- Polystyrene (PS), PVC, and PET: May need specific stabilizers compatible with their chemical structure.
2. Assess Processing Conditions
High-temperature processing can accelerate polymer degradation:
- Injection molding and extrusion require antioxidants that can withstand high shear and temperatures.
- If processing involves prolonged heating or recycling, choose a masterbatch with strong thermal stability.
3. Define End-Use Requirements
Consider the product’s lifespan, environment, and exposure to oxygen, UV, or heat:
- Indoor use: Standard antioxidants may suffice.
- Outdoor or high UV exposure: Combine antioxidants with UV stabilizers.
- Food-contact or medical-grade plastics: Ensure masterbatch is compliant with regulations.
4. Check Compatibility with Carrier Resin
Anti-oxidant masterbatches are blended into the main polymer.
- Common carriers include PP, PE, or other compatible resins.
- Ensure the carrier does not negatively affect processing or final product properties.
5. Evaluate Concentration and Dosage
- Higher concentrations offer stronger protection but may impact cost and physical properties.
- Consult supplier guidelines for recommended dosage, typically expressed as a percentage of the total polymer weight.
6. Consider Regulatory and Safety Requirements
- Ensure compliance with local or international regulations, such as FDA, EU REACH, or RoHS, depending on application.
7. Supplier Expertise and Technical Support
- Work with suppliers who provide technical datasheets, processing guidance, and trials to optimize performance.
Summary:
The right anti-oxidant masterbatch depends on the polymer type, processing conditions, end-use environment, carrier compatibility, and regulatory requirements. Careful selection ensures improved thermal stability, oxidation resistance, and extended product lifespan.