Бисфенол А бис (дифенилфосфат)

Description

Bisphenol A bis(diphenylphosphate), abbreviated BDP (also BADP, BAPP, BPADP) is a halogen-free organophosphorus flame retardant based on bisphenol A and diphenylphosphate. The molecule contains two phosphate moieties linked through a bisphenol-A bridge, which reduces volatility compared to monophosphate flame retardants and provides high thermal and hydrolytic stability when processing engineering plastics.

Identification

• CAS No: 5945-33-5
• Chemical formula: C39H34O8P2
• English name: Bisphenol A bis(diphenyl phosphate)
• Molecular Weight: 692.63
• Exact weight: 692.63
• EU number: 425-220-8
• DSSTox ID: DTXSID8052720
• PSA characteristic: 89.5
• XLogP3: 8.66

Physico-chemical properties

• Appearance: liquid
• Density: 1.3±0.1 g/cm3
• Boiling point: 679.6±48.0 °C at 760 mm Hg. Art.
• Flash point: 377.2±49.9°C
• Refractive index: 1.611
• Collision cross section: 246.33 Ų [M+H]+

Scope of application

Halogen-free flame retardant for structural thermoplastics: polycarbonate/ABS plastic (PC/ABS), polyphenylene oxide/polystyrene (PPO/HIPS) mixtures, as well as for electrical insulation of wires and cables. Serves as an alternative to decabromodiphenyl ether (Deca-BDE) in the housings of televisions, monitors and other consumer electronics, where halogen-free requirements are being tightened. Low volatility and resistance to hydrolysis allow it to withstand the high processing temperatures typical of engineering plastics.

Fire protection mechanism

Organophosphorus fire retardants of the BDP type act predominantly in the condensed phase: during combustion, phosphate groups decompose to form polyphosphoric acid, which catalyzes dehydration and charring of the polymer matrix. The resulting carbon layer slows down heat and mass transfer to the flame, reducing the burning rate and smoke emission. Some of the phosphorus-containing decomposition products also act in the gas phase, breaking chain radical combustion reactions - this explains the demand for BDP as a replacement for halogenated flame retardants, which work primarily due to radical inhibition in the gas phase.

GHS classification

Hazard Statement H413 (100% notice): May cause long-term harmful effects to aquatic life; Precautions P273 and P501. Aggregated information was obtained from 580 companies from 3 notifications, as well as separately from 138 companies from 3 notifications to the ECHA C&L register.

Storage and handling

As a liquid that is hazardous to the aquatic environment upon prolonged exposure, the product is stored in a closed container to prevent it from entering the soil and water bodies, and the discharge of residues and wash water into the sewer without treatment is avoided.

Positioning among fire retardants

BDP is an oligomeric phosphate flame retardant, along with resorcinol bis(diphenylphosphate) (RDP). Compared to monophosphates (triphenyl phosphate), it is less volatile and holds better in the polymer matrix during long-term use of the product, which reduces the migration of the fire retardant to the surface and its sweating (“blooming”).