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Bisphenol A bis(diphenyl phosphate (BDP)
Chemical Name: Bisphenol-A bis(diphenyl phosphate) (BDP)
Cas No. : 5945-33-5
EINECS No.: 425-220-8
Molecular formula: (C₃₉H₃₄O₈P₂)
Molecular weight: 692.64
Basic Properties
Chemical Classification
Organophosphorus compound (C₃₉H₃₄O₈P₂)
Solubility
Soluble in Aromatic hydrocarbons (toluene, xylene), Halogenated solvents (dichloromethane), Ethers (THF), Esters (ethyl acetate). Insoluble in: Water (<0.01 g/L at 20°C), Aliphatic hydrocarbons (hexane).
Functional Features
Primary Advantages
- High-efficiency flame retardancy (UL94 V-0 achievable at 8–15 wt%)
- Excellent thermal stability (decomposition onset >300°C)
- Low volatility (vapor pressure <1×10⁻⁸ Pa at 25°C)
Secondary Benefits
- Maintains polymer mechanical properties (vs. brominated alternatives)
- Good electrical insulation properties
Limitations
- Requires anti-dripping agents (e.g., PTFE) for certain polymers
- May affect transparency in clear resins
Flame Retardant Mechanism
Triple-Action Protection
- Gas Phase: Releases PO· radicals to interrupt combustion chain reactions
- Condensed Phase: Promotes char formation (up to 30% weight retention at 600°C)
- Endothermic Decomposition: Absorbs 450–500 J/g during pyrolysis
Basic Specifications
| No. | Standards | Index | ||||
| 1 | Flashing Point(℃) | 330-340 | ||||
| 2 | Viscosity (40℃),mPa·s | 2200-2500 | ||||
| 3 | Freezing Point (℃) | 4-5 | ||||
| 4 | Acidity (mgKOH/g) | ＜0.2 | ||||
| 5 | Moisture content % | ＜0.1 | ||||
| 6 | Specific gravity (20℃) | 1.250-1.270 | ||||
Primary Applications
Engineering Plastics
Materials: PC/ABS, PPO-HIPS, PET/PBT blends
Processing
- Optimal loading: 10–18 wt%
- Processing temp: ≤280°C (short-term)
Performance
- UL94 V-0 at 1.6mm thickness (PC/ABS)
LOI improvement: +8–12 points
Electronics Encapsulation
Applications
- LED packaging materials
- Circuit board coatings
Benefits
- Low corrosion risk vs. halogenated systems
- CTI >400V
Transportation Materials
Compliance:
- EU 2019/1021 (POPs regulation)
- China GB/T 26572-2011
Formulation Tips
Synergistic Systems
- 3:1 ratio with melamine polyphosphate for enhanced charring
- 1–2% silicone additives for improved dispersion
Processing Notes
- Pre-dry polymers (<0.05% moisture) before compounding
- Recommend twin-screw extrusion for optimal dispersion
Package
- 200 kg stainless steel drums
1,000 kg IBC totes (nitrogen blanketed)
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