How can TPU granules maintain good impact resistance and avoid embrittlement in low-temperature environments?
Publish Time: 2026-03-31
In low-temperature environments, polymer materials often exhibit increased rigidity and decreased toughness, even leading to embrittlement and fracture. TPU granules, widely used in automotive parts, electronic components, and sporting goods, require high low-temperature impact resistance.1. Molecular structure design is key to resisting low-temperature embrittlementTPU consists of soft and hard segments, with the soft segments primarily determining the material's flexibility and low-temperature performance. In low-temperature environments, if the glass transition temperature of the soft segments is low, the material can still maintain a certain degree of molecular chain mobility, thus avoiding embrittlement. Therefore, selecting low-Tg polyether polyols as soft segment raw materials can significantly improve the low-temperature impact resistance of TPU. Simultaneously, rationally controlling the hard segment content to provide necessary strength without excessively restricting molecular chain movement is crucial for achieving a performance balance.2. Material type selection affects environmental adaptabilityIn practical applications, TPU is mainly divided into two categories: polyester and polyether. In comparison, polyether-based TPU exhibits superior low-temperature flexibility and hydrolysis resistance, making it suitable for cold or humid environments. Polyester-based TPU, while performing better in abrasion resistance and strength, is more prone to performance degradation at low temperatures. Therefore, selecting the appropriate material type based on the application environment is a key strategy to ensure TPU does not become brittle at low temperatures.3. Plasticization and Modification Technologies Enhance FlexibilityAdding appropriate plasticizers or employing blending modification techniques can further improve the low-temperature flexibility of TPU. For example, introducing elastomers or rubber components with excellent low-temperature performance can form a multiphase structure, absorbing more energy during impact and thus improving impact resistance. Furthermore, modification using nanofillers also helps improve the material's toughness and crack propagation resistance, making it less prone to breakage under low-temperature impact.4. Processing Optimization Reduces Internal DefectsDuring the processing of TPU products, defects such as internal stress, bubbles, or uneven crystallization can become crack initiation points at low temperatures. Therefore, during injection molding or extrusion, it is necessary to optimize temperature control, cooling rate, and mold design to ensure a uniform internal structure of the material. Simultaneously, releasing residual stress through appropriate post-processing can further improve the material's stability and impact resistance in low-temperature environments.5. Application Design and Structural Coordination are Equally ImportantBesides the material itself, the product's structural design also affects TPU's performance at low temperatures. For example, by adding rounded corners and avoiding sharp stress concentration areas, the impact of impact loads on localized areas can be reduced. At the same time, maintaining uniform thickness helps avoid the risk of fracture due to localized rigidity differences. Through synergistic optimization of material and structure, the reliability of TPU products in low-temperature environments can be further improved.In summary, TPU granules, through molecular structure design, material type selection, modification technology application, and processing and structural optimization, can maintain good impact resistance without becoming brittle in low-temperature environments. This multi-layered optimization strategy enables TPU to maintain excellent performance in harsh environments, meeting the needs of various fields for high-reliability materials.
