Overview
Linear hydroxy-terminated polyurethane is a reactive polymer characterized by terminal hydroxyl (-OH) groups along its chain. These groups enable crosslinking with isocyanates or other curing agents, making it valuable in thermosetting systems. The polymer's properties are adjustable by varying the polyol/isocyanate ratio and chain extenders. Industrially, it bridges the gap between conventional polyurethanes and specialty resins, offering a balance of mechanical strength and processability. Its synthesis typically involves reacting diisocyanates with diols, followed by termination with hydroxyl-rich compounds. Grades vary by molecular weight, hydroxyl functionality, and flexibility.
Physical and Chemical Properties
The material exhibits viscosity ranging from liquid to solid states, depending on molecular weight. Higher hydroxyl values increase reactivity but may reduce shelf life. Its glass transition temperature (Tg) is tunable from -50°C to 80°C, enabling applications from flexible elastomers to rigid coatings. Chemically, the hydroxyl groups participate in urethane formation, esterification, and etherification reactions. The polymer resists non-polar solvents but swells in polar organics. Thermal stability typically reaches 180-220°C before decomposition. Hydrolytic stability varies; aromatic-based versions outperform aliphatic ones in humid environments.
Main Applications
In coatings, it provides scratch resistance and chemical durability, especially for automotive clearcoats and industrial finishes. Adhesive formulations leverage its bonding strength for substrates like metals, plastics, and wood, often in two-component systems. Elastomers derived from this polymer appear in gaskets, rollers, and medical devices. Its compatibility with fillers (e.g., silica, carbon black) allows reinforcement for composite materials. Emerging uses include 3D printing resins and biodegradable variants for eco-friendly packaging.
Safety and Storage
While generally low-hazard, uncured material may cause mild skin irritation. Use PPE (gloves, goggles) during handling. Ensure adequate ventilation to avoid vapor accumulation, though volatility is typically low. Storage requires moisture-proof containers to prevent premature crosslinking. Steel or polyethylene drums are common. Shelf life is 6-12 months at <30°C; refrigerated storage extends this but may require warming before use. Incompatibilities include strong acids, bases, and oxidizers.
B2B Procurement Guide
Specify key parameters: hydroxyl value (mg KOH/g, commonly 50-200), viscosity (measured at 25°C), and acid number (<2 mg KOH/g preferred). For elastomers, request elongation-at-break and tensile strength data. Bulk purchases (drum or tote quantities) reduce costs by 15-30%. Verify supplier certifications (ISO 9001, REACH compliance). Sample testing is recommended to confirm compatibility with downstream formulations. Lead times vary from 2 weeks (standard grades) to 8 weeks (custom syntheses).
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