PVC heat stabilizer
PVC (Polyvinyl Chloride) is susceptible to thermal degradation during processing and long-term exposure to heat. PVC heat stabilizers are additives specifically designed to prevent or minimize this degradation, ensuring the stability and integrity of PVC products. These stabilizers play a crucial role in maintaining the physical and mechanical properties of PVC materials when subjected to elevated temperatures.
PVC heat stabilizer functions by scavenging and neutralizing the acidic byproducts generated during PVC thermal processing, thereby preventing the breakdown of the polymer chain. They also inhibit the formation of hydrochloric acid, which is a key contributor to PVC degradation.
Functions and Characteristics
Specification
| Item | Specification | |
| item | unit | index |
| appearance | Colorless transparent liquid | |
| Chroma | Pt-Co number | ≤50 |
| Tin content | % | ≥19.0 |
| Relative density | (g/m3)20ºC | 1.17-1.19 |
| Refractive index | nD20 | 1.507-1.511 |
- Thermal Stability: PVC heat stabilizers are designed to impart thermal stability to PVC formulations, preventing degradation and maintaining the integrity of the polymer structure at elevated temperatures during processing and use.
- Acid Scavenging: One of the primary functions of heat stabilizers is to scavenge and neutralize acidic byproducts generated during the thermal degradation of PVC. This helps prevent the formation of hydrochloric acid, a major contributor to PVC degradation.
- Metal Content: Depending on the type, heat stabilizers may contain metals such as lead, calcium, zinc, tin, barium, or cadmium. Modern formulations often favor lead-free alternatives to address environmental and regulatory concerns.
- Environmental Compatibility: Eco-friendly PVC heat stabilizers, including calcium-zinc, organic-based, and other lead-free alternatives, are increasingly preferred due to their lower environmental impact and compliance with regulatory standards.
- Compatibility with PVC Formulations: Effective heat stabilizers should be compatible with PVC resins and other additives in the formulation. They should not negatively impact the processing characteristics or the final properties of the PVC product.
- Processability: Heat stabilizers should enhance the processability of PVC, ensuring smooth and efficient processing during extrusion, injection molding, or other manufacturing methods.
- Long-Term Stability: The stability provided by heat stabilizers should extend throughout the lifecycle of the PVC product, ensuring that it maintains its performance and structural integrity over an extended period.
- Resistance to External Factors: PVC products stabilized with heat stabilizers should demonstrate resistance to external factors such as weathering, UV radiation, and chemical exposure, ensuring long-term durability.
Major Applications
Regulatory Compliance:
PVC heat stabilizers must comply with relevant regulations and standards governing the use of additives in plastics, especially regarding the content of certain metals, such as lead and cadmium, to ensure product safety and environmental responsibility.
Application-Specific Performance:
Different PVC applications may require specific heat stabilizers tailored to the demands of the intended use, such as pipes, cables, profiles, or films. The characteristics of the stabilizer should align with the performance requirements of the application.
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Package
Packing In 225kgs /250kgs net plastic drum or 1000kgs/1200kgs IBC Tote.
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Storage
Keep tightly closed and store in cool and dry place. Avoid sunlight and heat.
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Period of validity
12 months.
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