Polyurethane Resin Particles
Overview
Polyurethane resin granules are thermoplastic or thermosetting polymer particles derived from the reaction of diisocyanates with polyols. They are prized for their tunable properties, including hardness, elasticity, and resistance to oils, solvents, and abrasion. These granules serve as raw materials for manufacturing polyurethane-based products, such as foams, coatings, and synthetic leather. Their adaptability makes them indispensable in industries ranging from automotive to footwear.
Physical and Chemical Properties
Polyurethane granules exhibit a density of 1.1–1.3 g/cm³ and melt at 120–200°C, depending on formulation. They are insoluble in water but dissolve in polar organic solvents like dimethylformamide (DMF). Key characteristics include high tensile strength, elongation at break (up to 600%), and resistance to ozone and UV radiation. Additives can enhance flame retardancy or conductivity for specialized applications.
Main Applications
In coatings, PU granules provide durable, flexible finishes for floors and automotive parts. They are also used in adhesives for bonding textiles and plastics. Elastomers made from these granules appear in seals, gaskets, and wheels. The construction sector utilizes them for waterproof membranes, while consumer goods include shoe soles and sporting equipment.
Safety and Storage
Store granules in sealed containers at <30°C and <60% humidity to prevent clumping. Avoid contact with strong acids/bases, which may degrade the material. While non-toxic, processing may generate dust requiring ventilation. Wear gloves and goggles to minimize skin/eye irritation. Follow local regulations for disposal.
B2B Procurement Guide
Specify technical parameters like Shore hardness (e.g., 70A–90A), melt flow index, and thermal stability (e.g., 150°C+). Request SDS and RoHS/REACH compliance certificates. Bulk orders (1+ metric tons) typically reduce costs by 10–20%. Verify supplier quality via third-party testing for consistency in particle size and purity.
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