Overview
Synthetic Polyester Polyol is a polymer containing multiple hydroxyl (-OH) groups, synthesized via polycondensation of dicarboxylic acids (e.g., adipic acid) and diols (e.g., ethylene glycol). It serves as a foundational component in polyurethane systems, offering tailored properties like flexibility, durability, and chemical resistance. Industrially, it is classified by hydroxyl value (mg KOH/g) and molecular weight, which determine reactivity and end-use performance. Its versatility makes it indispensable in sectors ranging from automotive to construction.
Physical and Chemical Properties
The material's viscosity ranges from 500 to 10,000 mPa·s at 25°C, depending on molecular weight. Its hydroxyl value (typically 50-300 mg KOH/g) directly influences crosslinking density in polyurethanes. Thermal stability is moderate, with decomposition starting around 200°C. Key chemical traits include ester group hydrolysis sensitivity under acidic/basic conditions and reactivity with isocyanates to form urethane linkages. Its hydrophobicity limits water absorption, enhancing durability in humid environments.
Main Applications
In flexible polyurethane foams, polyester polyols provide superior load-bearing and resilience compared to polyether variants. They are preferred for high-performance coatings due to excellent adhesion and abrasion resistance. Elastomers derived from these polyols exhibit exceptional oil and fuel resistance, making them ideal for gaskets and industrial hoses. In adhesives, they improve bonding strength and flexibility, especially in shoe manufacturing and automotive assembly.
Safety and Storage
While generally low-hazard, molten polyester polyol can cause thermal burns. Ensure adequate ventilation during processing to avoid vapor accumulation. Use nitrile gloves and goggles to prevent skin/eye contact. Storage requires moisture-proof packaging (e.g., nitrogen-blanketed drums) to prevent hydrolysis. Shelf life is typically 6-12 months at <30°C. Incompatible with strong oxidizers; keep away from open flames.
B2B Procurement Guide
Buyers should specify technical parameters: hydroxyl value (±5% tolerance), acid value (<2 mg KOH/g), and viscosity at 25°C. Bulk purchases (≥1 ton) often attract 10-15% discounts. Verify supplier certifications (e.g., ISO 9001) and request SDS documentation. For export, confirm compliance with REACH or other regional regulations. Sample testing is recommended to ensure compatibility with existing formulations.
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