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Antioxidant 168, also known as Tris(2,4-di-tert-butylphenyl) phosphite, is a phosphite-based antioxidant commonly used in the polymer and plastics industry. It is primarily used to stabilize various polymers, such as polypropylene, polyethylene, polyvinyl chloride (PVC), and other thermoplastic materials.
Chemical Formula: C42H63O3P
CAS Number: 31570-04-4
Appearance: It is typically a white to off-white powder or granule.
Function: It acts as a secondary antioxidant that decomposes hydroperoxides into non-radical, non-reactive products, thereby protecting polymers from thermal oxidation during processing and end-use.
Compatibility: It is often used in combination with primary antioxidants (like Antioxidant 1010 or Antioxidant 1076) to provide synergistic stabilization effects in polymers.
Antioxidant 168 is widely used in the plastics and polymer industry to enhance the stability and lifespan of various materials. Its main function is to prevent oxidative degradation, which can occur during processing at high temperatures or over time during the product's life cycle.
### Applications of Antioxidant 168:
1. **Polyolefins**:
- Used in polymers such as **polypropylene (PP)** and **polyethylene (PE)**, including low-density (LDPE), high-density (HDPE), and linear low-density (LLDPE) forms.
- Helps prevent thermal and oxidative degradation during processing and end use, ensuring durability and color stability.
2. **Engineering Plastics**:
- Applied in materials like **polycarbonate (PC)**, **polyamide (PA)**, **polybutylene terephthalate (PBT)**, and **acrylonitrile butadiene styrene (ABS)**.
- Protects these engineering plastics from degradation due to exposure to heat and light, maintaining their mechanical and physical properties.
3. **Elastomers and Rubbers**:
- Utilized in thermoplastic elastomers (TPEs), synthetic rubbers, and natural rubbers.
- Enhances the oxidation stability of rubbers used in automotive, industrial, and consumer products, such as seals, hoses, and gaskets.
4. **Adhesives, Coatings, and Sealants**:
- Incorporated into adhesives and coatings to protect against oxidation and thermal degradation.
- Improves the shelf life and performance of adhesives and coatings exposed to environmental factors.
5. **Polyurethane (PU) Foams**:
- Applied in flexible and rigid polyurethane foams to prevent yellowing and degradation caused by oxidative reactions.
- Commonly used in furniture, automotive seating, insulation materials, and packaging foams.
6. **Combination with Primary Antioxidants**:
- Often used in combination with **primary antioxidants** (such as Antioxidant 1010 or 1076) to provide **synergistic effects**.
- This combination enhances the overall stabilization by providing both immediate and long-term protection against oxidation.
7. **Fibers, Films, and Molded Parts**:
- Used in the production of films, fibers, and various molded parts to ensure thermal stability during processing and to extend the lifespan of the end product.
Overall, Antioxidant 168 is a versatile stabilizer that helps protect polymers from thermal and oxidative degradation, maintaining their appearance, mechanical properties, and durability.
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