Overview
Heat-resistant PBAT is a modified version of Polybutylene Adipate Terephthalate (PBAT), a biodegradable aliphatic-aromatic copolyester. It retains the flexibility and compostability of standard PBAT while offering improved performance at elevated temperatures. This material is particularly valuable in applications where biodegradable plastics are required to withstand higher processing or usage temperatures. The heat resistance is typically achieved through polymer blending or additive modification while maintaining compliance with industrial compostability standards.
Physical and Chemical Properties
The heat-resistant variant maintains PBAT's characteristic flexibility (elastic modulus ~50-100 MPa) while enhancing its thermal stability. Typical modifications increase the heat deflection temperature by 10-20°C compared to standard PBAT (which softens around 60-70°C). Chemical resistance remains similar to conventional PBAT - resistant to oils and weak acids but susceptible to strong bases. The material maintains good UV stability and weatherability, making it suitable for outdoor applications like agricultural films. The biodegradation rate in industrial composting conditions (58°C) typically exceeds 90% within 180 days.
Main Applications
Primary applications include hot-fill biodegradable packaging (e.g., soup pouches, coffee capsules) where standard PBAT would deform. The material is also used for agricultural mulch films in warmer climates, where soil temperatures may exceed 60°C. Other growing applications include disposable cutlery for hot foods and compostable tea bags. In injection molding, heat-resistant PBAT allows production of thicker-walled containers that retain shape when filled with warm liquids. The automotive industry is exploring it for temporary protective films during paint curing processes.
Safety and Storage
As a food-contact material, heat-resistant PBAT complies with FDA 21 CFR and EU 10/2011 regulations when using approved additives. Processing should maintain temperatures below 200°C to prevent thermal degradation and potential volatile emissions. Storage recommendations include keeping the material in original packaging at temperatures below 30°C with relative humidity under 60%. Prolonged exposure to moisture may cause hydrolysis before processing. Unlike some bioplastics, PBAT doesn't require refrigeration but benefits from nitrogen blanketing in bulk storage.
B2B Procurement Guide
When sourcing heat-resistant PBAT, verify the supplier's test data for thermal stability under your specific application conditions. Key specifications to request include melt flow index (MFI) at your processing temperature and heat deflection temperature (HDT) at 0.45MPa or 1.82MPa. For packaging applications, confirm migration testing results if contacting fatty or acidic foods. Bulk purchases (20+ metric tons) typically qualify for 5-10% discounts, but consider regional availability as shipping costs affect the total price. Some manufacturers offer technical support for processing parameter optimization at no additional cost.
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