Polyurethane[4]
Overview
Polyurethane (PU) is a synthetic polymer composed of organic units linked by urethane (carbamate) bonds. It is produced via reaction between diisocyanates and polyols, yielding materials with tunable properties ranging from rigid foams to flexible elastomers. Developed in the 1930s, PU has become integral to industries like construction, automotive, and textiles due to its adaptability and performance. PU exists in thermoset (cross-linked) and thermoplastic forms, with variants including foams (open/closed-cell), coatings, adhesives, and fibers. Its versatility stems from the ability to modify raw materials (e.g., polyester vs. polyether polyols) and processing methods (e.g., spray, casting).
Physical and Chemical Properties
PU exhibits exceptional mechanical properties, including high tensile strength (up to 50 MPa for elastomers), elongation (100–1,000%), and resistance to oils, solvents, and ozone. Rigid foams provide low thermal conductivity (0.02–0.03 W/m·K), making them ideal for insulation. Chemical resistance varies by formulation. Polyester-based PU resists hydrocarbons but hydrolyzes in water, while polyether-based types withstand moisture better. PU degrades at temperatures above 200°C, releasing toxic gases like hydrogen cyanide, necessitating careful handling during fabrication.
Main Applications
Construction: PU foam is widely used for wall insulation, roofing, and sealants due to its thermal efficiency and adhesion. Automotive: Flexible foams seat cushions, while elastomers make durable bushings and tires. Consumer Goods: Footwear midsoles, synthetic leather (e.g., faux suede), and furniture upholstery leverage PU’s comfort and aesthetics. Industrial: Coatings protect pipelines, and adhesives bond laminates in aerospace. Medical-grade PU is biocompatible for catheters and wound dressings.
Safety and Storage
Pre-polymer components (isocyanates) are hazardous, causing respiratory irritation and skin sensitization. Use NIOSH-approved respirators and gloves during handling. Store isocyanates in sealed containers under dry nitrogen to prevent moisture-induced polymerization. Finished PU products are generally inert but may emit volatile organic compounds (VOCs) during curing. Ensure adequate ventilation in workspaces. Dispose of waste via incineration or approved recycling (e.g., regrinding for filler).
B2B Procurement Guide
Key specifications include density (for foams), Shore hardness (for elastomers), and flame-retardant ratings (e.g., UL94). For coatings, consider viscosity and curing time. Bulk buyers should audit suppliers for ISO 9001 certification and batch consistency. Prices fluctuate with petrochemical feedstock costs. Flexible foam is typically $3–$6/kg, while specialty grades (e.g., medical) exceed $15/kg. MOQs vary; some manufacturers offer custom formulations for orders above 1 ton.
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