Overview
Polyurethane adipate is a polymer derived from adipic acid (hexanedioic acid) and diisocyanate monomers, forming a class of polyester-based polyurethanes. It is valued for its balanced mechanical properties and chemical resistance. The material is commonly produced through polycondensation reactions, where adipic acid reacts with glycols to form a prepolymer, which is then chain-extended with diisocyanates. This process allows customization of hardness, flexibility, and other performance characteristics.
Physical and Chemical Properties
The material exhibits excellent tensile strength (10-40 MPa) and elongation at break (300-600%), making it suitable for dynamic applications. Its ester groups provide better hydrolysis resistance compared to polyether-based polyurethanes. Thermal stability typically ranges from -40°C to 80°C, with some grades stable up to 120°C. The material shows good resistance to oils, greases, and mild chemicals, though strong acids/bases may degrade it.
Main Applications
Industrial applications dominate usage, including conveyor belts, hydraulic seals, and industrial rollers where abrasion resistance is critical. The automotive sector uses it for bushings and suspension components. In coatings, it provides durable finishes for flooring and marine equipment. Adhesive formulations leverage its flexibility and bonding strength for footwear and textile laminates. Emerging uses include 3D printing filaments for flexible prototypes.
Safety and Storage
While generally low-hazard, dust inhalation during machining should be avoided with proper ventilation. Uncured prepolymers may contain residual isocyanates requiring skin/eye protection. Store in original sealed containers to prevent moisture absorption, which can cause premature curing. Shelf life is typically 12 months when stored below 30°C with desiccants. Bulk storage tanks should use nitrogen blankets to minimize oxidation.
B2B Procurement Guide
Industrial buyers should specify: molecular weight (typically 1,000-3,000 g/mol), hydroxyl value (20-60 mg KOH/g), and acid value (<2 mg KOH/g). These parameters determine processing characteristics. Consider supplier certifications like ISO 9001 and REACH compliance. For coating applications, verify viscosity ranges (commonly 2,000-10,000 cP at 25°C). Bulk shipments (500kg+ drums) typically offer 15-20% cost savings versus small packages.
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