Excellent Environmental Resistance
TPU film performs well in terms of environmental resistance and can adapt to various complex environmental conditions. In terms of temperature resistance, it can maintain stable performance in a wide temperature range of -40℃ to 80℃. In low-temperature environments, the soft segments do not crystallize, avoiding brittle fracture of the material; in high-temperature environments, the hard segments do not melt, maintaining the structural strength of the material. This characteristic enables TPU film to be used in cold polar regions, such as making waterproof and breathable layers for polar expedition suits, and also to play a role in hot desert environments, such as heat insulation protective films in automobile engine compartments.
At the same time, TPU film has outstanding weather resistance. After 1000 hours of ultraviolet aging test, the attenuation rate of its tensile performance is only 10%-15%, which is much lower than that of PVC film (more than 50%). Moreover, it is not sensitive to humidity changes, and when used in an environment with a relative humidity of 90% for a long time, the performance fluctuation can be controlled within 5%. Therefore, TPU film is very suitable for outdoor building materials, such as sunshades and building membrane structures, which can resist the erosion of ultraviolet rays, wind, rain and humidity for a long time and maintain good performance and appearance.
Good Chemical Stability and Functional Diversity
TPU film has good resistance to common media such as water, oil, acid and alkali. After being soaked in water for 30 days, the tensile performance decreases by no more than 8%; after contact with engine oil, detergent, etc., there is no swelling or cracking, while PVC film is easy to swell when exposed to oil, and PE film will be eroded by organic solvents. Based on this characteristic, the surface of TPU film can be modified in various ways. For example, frosting treatment can improve skid resistance, which is used to make protective cases for electronic products; coating with an antibacterial layer can enhance hygiene performance, which is applied to the surface protection of medical equipment; compounding with a hydrophilic coating can improve air permeability, which is used to make fabrics for sportswear, etc. Moreover, these modification treatments basically do not affect the original mechanical properties of TPU film.
In addition, the barrier performance of TPU film can be adjusted as needed. By changing the density and microporous structure, it can be made into a highly breathable film for clothing and medical fields, allowing human skin to breathe freely, and also can produce a highly airtight film for inflatable products, waterproof packaging, etc., ensuring that gas or liquid will not leak. For example, in inflatable water park facilities, TPU high-airtightness film can ensure the stable inflation state of the facilities and provide a safe and reliable entertainment experience; in medical wound dressings, highly breathable TPU film can not only prevent bacterial invasion but also promote gas exchange during wound healing.