Di(2-Ethylhexyl) Phenyl Phosphite – CAS No. 3164-60-1
Product Overview
Di(2-Ethylhexyl) Phenyl Phosphite, chemically known as C₂₂H₃₉O₃P with CAS Number 3164-60-1, is a specialized organophosphorus compound functioning as a chelating agent, auxiliary antioxidant, and stabilizer in polymer processing. This colorless, transparent liquid demonstrates low volatility and excellent compatibility with PVC and synthetic resins, providing superior color suppression and enhanced light stability without altering viscosity significantly. With a typical purity ≥95%, it effectively sequesters metal ions to prevent degradation and discoloration during extrusion and molding, extending product lifespan in demanding environments. Its branched alkyl chains ensure hydrolytic stability, making it a preferred choice for high-performance formulations requiring thermal and oxidative resistance.
Key benefits of Di(2-Ethylhexyl) Phenyl Phosphite include:
- Chelation Efficiency: Binds trace metals to inhibit catalytic oxidation, reducing yellowing in clear PVC.
- Antioxidant Synergy: Boosts primary antioxidants like phenols for prolonged protection against heat aging.
- Color Preservation: Maintains optical clarity in films and sheets, ideal for packaging and agricultural applications.
- Low Acidity: Minimal acid value ensures compatibility with sensitive resins without corrosion risks.
- Versatile Processing: Stable at processing temperatures up to 200°C, supporting high-speed production.
Di(2-Ethylhexyl) Phenyl Phosphite is synthesized through transesterification of phenyl phosphite with 2-ethylhexanol, yielding a high-purity liquid that adheres to industrial standards for polymer additives.
Technical Specifications
| Property | Value/Description |
|---|---|
| Chemical Formula | C₂₂H₃₉O₃P |
| CAS Number | 3164-60-1 |
| Molecular Weight | 382.52 g/mol |
| Appearance | Colorless transparent liquid |
| Purity | ≥95% |
| Chroma (Pt-Co) | ≤50 |
| Density (at 25°C) | 0.940-0.960 g/cm³ |
| Refractive Index (nD25) | 1.4750-1.4830 |
| Acid Value (mg KOH/g) | ≤0.10 |
| Boiling Point | 415°C (predicted) |
| Flash Point | >150°C |
| Storage | Cool, dry place; nitrogen blanket |
Applications
Polymer Stabilization
- PVC Processing: Added at 0.2-0.5 phr to rigid and flexible PVC formulations for granules, transparent sheets, and pipes, preventing plate-out and maintaining clarity during calendering.
- Agricultural and Shrink Films: Enhances UV resistance in mulch and packaging films, extending outdoor durability by 20-30% through metal deactivation.
Synthetic Resins
- Polyolefins and ABS: Auxiliary stabilizer at 0.1-0.3% in compound liquid and paste systems, synergizing with hindered phenols to improve long-term heat stability.
- Adhesives and Coatings: Chelator in reactive hot-melt adhesives and solvent-based coatings, reducing discoloration from metal catalysts.
Why Choose Our Di(2-Ethylhexyl) Phenyl Phosphite?
Our Di(2-Ethylhexyl) Phenyl Phosphite is refined to achieve chroma <30 and acid value <0.05, minimizing impurities like free phenol (<0.1%) for exceptional performance and regulatory compliance. Processors report 15% better color retention in PVC extrudates and reduced additive migration. Available in industrial grades, packaged in 180kg galvanized barrels or 200kg drums, with bulk tanker options for high-volume needs and certifications for REACH and TSCA.
Frequently Asked Questions (FAQs)
What is Di(2-Ethylhexyl) Phenyl Phosphite?
It is an organophosphite with formula C₂₂H₃₉O₃P and CAS 3164-60-1, used as a chelating antioxidant. It’s a colorless liquid that stabilizes polymers by binding metals and suppressing oxidation in PVC and resins.
How is Di(2-Ethylhexyl) Phenyl Phosphite used in PVC stabilization?
Incorporate at 0.3-0.5 phr during compounding with Ca-Zn stabilizers; it chelates residual metals from pigments, preventing black spew and yellowing. Test in small batches for optimal synergy with primary antioxidants.
Is it safe for polymer applications?
Yes, it’s non-toxic and non-carcinogenic per OECD guidelines, with low volatility and no migration issues in food-contact PVC when used within limits, compliant with EU 10/2011 regulations.
What is the shelf life of Di(2-Ethylhexyl) Phenyl Phosphite?
Stored under nitrogen in cool, dry conditions (<30°C), it remains stable for 12-24 months, with minimal oxidation—monitor acid value periodically for extended storage.
Can Di(2-Ethylhexyl) Phenyl Phosphite be blended with other stabilizers?
It synergizes with phosphites like DOPi or phenolic antioxidants but avoid excess sulfur compounds to prevent hydrolysis; it’s compatible in most PVC lead-free systems after melt flow trials.
Does it affect resin clarity?
Its low chroma and high purity ensure no haze induction, actually enhancing initial whiteness and long-term transparency in clear PVC by inhibiting thermal degradation.
What packaging options are available for it?
We offer 180kg galvanized iron barrels, 200kg HDPE drums, and 20MT bulk tankers, all sealed with nitrogen to prevent contamination and suitable for international shipping.
For dosage optimization, compatibility testing, or custom blends, our polymer experts are available.
Contact Us
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