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Brominated Polyether Polyol is a reaction-type brominated flame-retardant polyol, engineered for integration into polyurethane (PU) foams, coatings, and elastomers. Distinguished by its bromine content of ≈20–30% and hydroxyl functionality (2–3 OH groups per molecule), it covalently bonds with isocyanates during PU synthesis—ensuring permanent flame retardancy without migration or leaching. Unlike additive brominated flame retardants (e.g., decabromodiphenyl ethane), it eliminates “blooming” (surface whitening) and preserves PU’s mechanical properties (retaining >90% tensile strength). With a decomposition temperature >250℃ (higher than PU processing temperatures of 80–150℃) and low viscosity (≈5,000–8,000 mPa·s at 25℃), it integrates seamlessly into PU production. Compliant with RoHS 2.0 and REACH SVHC, it is widely used in automotive PU foam, building insulation foam, and flame-retardant coatings—where long-term fire safety and material durability are critical.
Brominated Polyether Polyol’s hydroxyl groups (-OH) react with isocyanates (e.g., MDI, TDI) during PU synthesis, becoming part of the PU polymer backbone. This covalent bonding ensures bromine remains trapped in the matrix—eliminating migration even after 1,000 hours of aging at 85℃/85% RH (ISO 815). For example, flexible PU foam made with this polyol retains UL94 HF-1 rating after 500 hours of water immersion, outperforming foam with additive flame retardants (which lose efficacy due to leaching). This permanence is critical for long-service-life products like automotive seat cushions (10+ year lifespan) and building insulation (20+ year lifespan).
Available in grades with bromine content of 20%, 25%, and 30%, it enables tailored flame-retardant performance for different PU applications:
• 20% bromine grade: Achieves UL94 HF-2 in flexible PU foam (addition level: 30–40%), ideal for cost-sensitive furniture foam.
• 25% bromine grade: Delivers UL94 HF-1 in flexible PU foam (addition level: 25–30%) and UL94 V-2 in rigid PU foam (addition level: 20–25%), suitable for automotive foam.
• 30% bromine grade: Provides UL94 V-0 in rigid PU foam (addition level: 15–20%), critical for building insulation and electronic encapsulation.
All grades release bromine radicals during combustion to interrupt the combustion chain, while the polyol’s ether backbone enhances char formation—reducing heat release rate (HRR) by 35–50% (ISO 5660-1) vs. non-flame-retardant PU.
With a viscosity of 5,000–8,000 mPa·s at 25℃ (lower than generic flame-retardant polyols) and compatibility with all major isocyanates (MDI, TDI, HDI), it mixes uniformly with PU formulations—no additional compatibilizers required. It does not alter PU’s gel time (10–30 minutes at 25℃) or foam expansion ratio, ensuring consistent production quality. For example, rigid PU insulation foam made with this polyol has a closed-cell content of >90% (vs. 85% with additive flame retardants), maintaining thermal conductivity of ≈0.022 W/(m·K)—critical for energy efficiency in buildings.
Unlike additive flame retardants that cause PU brittleness, Brominated Polyether Polyol preserves mechanical performance:
• Flexible PU foam (25% bromine grade, 28% addition) retains >92% tensile strength (≈180 kPa) and >88% elongation at break (≈300%)—ensuring comfort in automotive seats.
• Rigid PU foam (30% bromine grade, 18% addition) maintains >89% compressive strength (≈250 kPa) and >90% flexural strength (≈15 MPa)—suitable for structural insulation panels.
• PU elastomers (20% bromine grade, 35% addition) retain >91% shore A hardness (≈70) and >87% tear strength (≈30 kN/m)—ideal for industrial rollers and gaskets.
| Category | Specifications |
| Chemical Identifiers | CAS Number: 68937-41-7 (generic for brominated polyether polyols) |
| Molecular Formula: CₙH₂ₙ₋₂ₓBrₓOₘ (varies by bromine content; x = bromine substitution level) | |
| Hydroxyl Value: 30–50 mg KOH/g (2–3 OH groups per molecule) | |
| Bromine Content: ≈20% , ≈25% , ≈30% (by weight, X-ray fluorescence) | |
| Physical & Thermal Properties | Appearance: Pale yellow to amber viscous liquid (no sediment, high clarity) |
| Viscosity: 5,000–8,000 mPa·s at 25℃ (ASTM D445) | |
| Density: 1.25–1.35 g/cm³ at 25℃ (increases with bromine content) | |
| Decomposition Temperature: >250℃ (5% weight loss, TGA under N₂) | |
| Flash Point: >180℃ (closed cup, ASTM D93) | |
| Water Content: <0.1% (Karl Fischer titration) | |
| pH Value: 6.5–7.5 (neutral) |
• Recommended Addition Level: 30–40% (20% bromine, flexible PU foam); 25–30% (25% bromine, automotive PU); 15–20% (30% bromine, rigid PU foam)
• Compatible Isocyanates: MDI (4,4'-diphenylmethane diisocyanate), TDI (toluene diisocyanate), HDI (hexamethylene diisocyanate)
• Processing Temperature: 80–150℃ (PU foam/coating synthesis)
• Additives: Compatible with PU catalysts (e.g., dibutyltin dilaurate), surfactants, and blowing agents (e.g., pentane)
Brominated Polyether Polyol is widely used in automotive seat cushions, headrests, and armrests. Flexible PU foam (25% bromine grade, 28% addition) meets FMVSS 302 (horizontal burn test) and retains comfort (indentation force deflection ≈300 N)—critical for passenger comfort. For electric vehicle (EV) seats, it also reduces smoke emission by 40% (ASTM E662) during fires, protecting battery components and passengers. Automotive manufacturers (e.g., Tesla, Toyota) use this polyol to replace additive flame retardants, eliminating blooming and improving foam durability (reducing replacement costs by 15% over 100,000 km).
In building construction, it is used in rigid PU foam for exterior wall insulation, roof panels, and refrigeration insulation. Rigid foam (30% bromine grade, 18% addition) achieves GB/T 8624-2012 (B1 grade) and ASTM E84 (Class A fire rating), with a thermal conductivity of ≈0.022 W/(m·K)—reducing building energy consumption by 20–30%. For refrigeration (e.g., cold storage, refrigerators), it maintains insulation efficiency at -40℃ to 80℃ and resists moisture absorption (<0.5% weight gain after 24h immersion), ensuring long-term performance.
PU coatings for steel structures, wooden furniture, and electronic enclosures use Brominated Polyether Polyol for flame retardancy. Steel structure coatings (25% bromine grade, 25% addition) meet GB/T 14907-2018 (flame-retardant coatings) and have a pencil hardness of ≈2H—protecting against corrosion and fire. Wooden furniture coatings (20% bromine grade, 30% addition) achieve UL94 V-0 (1.6mm) and retain wood’s natural texture, complying with furniture fire standards (e.g., BS 6853). Electronic enclosure coatings (30% bromine grade, 20% addition) resist 150℃ heat and provide electrical insulation (volume resistivity >10¹⁴ Ω·cm).
PU elastomers for industrial rollers, conveyor belts, and gaskets use this polyol to balance flame retardancy and elasticity. Industrial rollers (20% bromine grade, 35% addition) meet UL94 V-2 and retain shore A hardness ≈70—withstanding wear (abrasion loss <0.1 mm³/1000 cycles) in factory conveyors. PU adhesives for electronic bonding (25% bromine grade, 28% addition) achieve UL94 V-0 and have a shear strength of ≈12 MPa (aluminum substrates)—suitable for bonding PCB components and EV battery modules.
It covalently bonds with isocyanates during PU synthesis, ensuring permanent flame retardancy without migration.
It is offered in 20%, 25%, and 30% bromine grades for tailored performance in flexible/rigid PU applications.
It is stable at PU processing temperatures of 80–150℃, integrating seamlessly into foam/coating synthesis.
Yes, the 30% bromine grade is used in rigid PU building insulation, achieving GB/T 8624-2012 B1 grade.
