Overview
Polyol raw materials are multifunctional alcohols containing multiple hydroxyl groups (-OH), serving as key precursors in polyurethane production. They are classified into polyether polyols (derived from ethylene/propylene oxides) and polyester polyols (from dicarboxylic acids and glycols). These compounds are industrially synthesized through polymerization or condensation reactions, with properties tailored for specific applications. Their reactivity with isocyanates forms the basis of polyurethane chemistry, making them indispensable in flexible/rigid foams, coatings, and adhesives.
Physical and Chemical Properties
Polyols exhibit viscosity ranging from 100 to 10,000 mPa·s at 25°C, depending on molecular weight and structure. Their hydroxyl values (mg KOH/g) determine crosslinking density in final products. Key chemical attributes include hygroscopicity (requiring moisture control during storage) and thermal stability up to 200°C. Most commercial polyols have low volatility and flash points above 150°C. Reactivity can be modified with catalysts like amines or tin compounds during polyurethane formation.
Main Applications
Over 70% of polyol production supplies polyurethane foam manufacturing, including mattress foams (flexible) and insulation panels (rigid). In coatings, they enhance durability and chemical resistance. Specialty applications include automotive seat cushions, shoe soles, and medical device components. Bio-based polyols from vegetable oils are gaining traction in sustainable material development, though petroleum-derived variants still dominate industrial use.
Safety and Storage
Polyols generally have low acute toxicity (LD50 >2000 mg/kg) but may cause mild skin/eye irritation. Containers should be nitrogen-purged to prevent moisture absorption. Recommended storage temperature is 15-30°C in carbon steel or polyethylene tanks. Shelf life typically exceeds 12 months when protected from oxidation. Spills should be contained with absorbent materials, not washed into waterways.
B2B Procurement Guide
Industrial buyers should specify: hydroxyl value (±5 mg KOH/g tolerance), acid value (<0.1 mg KOH/g), and water content (<0.1%). Bulk shipments often require heated tankers. Quality certifications like ISO 9001 and REACH compliance should be verified. Sample testing for color (APHA <100) and viscosity stability is recommended before large orders. Just-in-time delivery minimizes storage costs.
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