Overview
Tetrahydroxy polyurethane is a four-functional polyol compound belonging to the polyurethane family. As a reactive intermediate, it contains four hydroxyl (-OH) groups that participate in urethane formation reactions. This structure makes it particularly valuable in creating crosslinked polymer networks with enhanced mechanical and chemical resistance properties. The material is synthesized through controlled reactions between diisocyanates and polyols, followed by careful termination to preserve the hydroxyl functionality. Industrial grades may contain additives or be blended with other polyols to modify performance characteristics for specific applications.
Physical and Chemical Properties
The physical properties of tetrahydroxy polyurethane vary significantly based on molecular weight and backbone chemistry. Typical commercial products exhibit viscosities ranging from 1,000 to 50,000 mPa·s at 25°C. The hydroxyl value, a critical parameter for formulation calculations, usually falls between 50-300 mg KOH/g. Chemically, these compounds demonstrate excellent resistance to oils, greases, and many organic solvents once fully cured. Their reactivity with isocyanates follows standard polyurethane chemistry, with the tetrafunctionality enabling three-dimensional network formation. The glass transition temperature (Tg) can be tailored from -50°C to +80°C through proper selection of raw materials and chain extenders.
Main Applications
In coatings technology, tetrahydroxy polyurethane serves as a key component in high-performance polyurethane paints, particularly for automotive and industrial finishes. Its four reactive sites contribute to rapid curing and exceptional hardness while maintaining flexibility—a combination difficult to achieve with difunctional polyols. The adhesive industry utilizes this material in structural bonding applications where thermal and chemical resistance are paramount. When formulated with appropriate isocyanates, it produces adhesives with lap shear strengths exceeding 20 MPa. Additional uses include elastomer production (notably for rollers and seals) and as a modifier for other polymer systems to enhance toughness and abrasion resistance.
Safety and Storage
While not classified as highly hazardous, tetrahydroxy polyurethane requires careful handling due to potential skin and eye irritation. Appropriate personal protective equipment (gloves, goggles) should be worn during handling. The material is typically not volatile but may contain trace amounts of monomers that could present inhalation risks in poorly ventilated areas. Storage stability is excellent when protected from moisture—typically 12-24 months in original sealed containers under nitrogen. Bulk storage tanks should be equipped with molecular sieves or other drying systems to prevent reaction with atmospheric humidity, which can lead to viscosity increases and reduced reactivity.
B2B Procurement Guide
Industrial buyers should specify several key parameters when procuring tetrahydroxy polyurethane: hydroxyl value (with acceptable tolerance), viscosity at 25°C, water content (typically <0.1%), and acid value. For critical applications, request batch certificates of analysis that include color (APHA), functionality, and residual monomer content. Technical support from suppliers is particularly valuable for formulators developing new products. Consider suppliers who provide application testing data and can recommend compatible isocyanate crosslinkers. Packaging options range from 200kg drums for small-scale users to isotanks (1000kg+) for large volume consumers. Just-in-time delivery may be preferable to minimize storage duration.
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