YuChun
Email : info3@greentpu.com
Add:No. 11, Wentang North Road, Wenzhou Road, Dongcheng Dist., Dongguan, Guangdong, China
(Old address:No. 232, Wentang North Road, Wenzhou Road, Dongcheng Dist., Dongguan, Guangdong, China)
Is TPU membrane prone to aging and cracking in the sun?
In outdoor application scenarios, whether the TPU membrane will age and crack due to sunlight is a common concern for users. This phenomenon is closely related to the molecular structure, type and environmental factors of the TPU membrane.
From a molecular perspective, high-energy photons in ultraviolet rays are the "culprit" that causes TPU membrane aging. The molecular chain of aromatic TPU membranes contains a benzene ring structure, and ultraviolet rays can easily destroy the chemical bonds near the benzene ring and trigger an oxidative degradation reaction. Data shows that the untreated aromatic TPU membrane may drop by 30%-40% when exposed to the sun outdoors for 3 months, and the surface may turn yellow and harden, and even crack in severe cases. In contrast, the aliphatic TPU membrane does not contain benzene rings, has a more stable structure, significantly improved UV resistance, and can reach 4-5 yellowing resistance levels (up to 5). Even if exposed to sunlight for a long time, it can maintain flexibility and physical properties better.
Environmental factors will also accelerate TPU membrane aging. High temperatures will aggravate the thermal movement of the molecular chains and accelerate their degradation rate; in high humidity environments, polyester TPUs may also undergo hydrolysis reactions, further weakening the performance of the membrane. In addition, pollutants in the air and chemical substances in industrial waste gas may react chemically with the TPU membrane, accelerating the aging process.
However, the weather resistance of the TPU film can be effectively improved through technical means. Adding ultraviolet absorbers, antioxidants and other additives during the production process can greatly enhance the anti-aging ability of the film material; using co-extrusion technology to combine the surface layer with the functional layer with good weather resistance can also protect the internal materials. For example, specially treated outdoor TPU membranes can extend their service life to 5-8 years. At the same time, standardized use and maintenance is also crucial. Avoiding the TPU membrane contact with sharp objects and regularly cleaning surface contaminants can all help delay aging.
The risk of aging and cracking of TPU membranes in the sun varies by type. Aromatic TPU membranes should be used with caution in long-term outdoor scenarios, while aliphatic TPU membranes and specially treated products can maintain good performance in the sun and meet a variety of application needs.

YuChun
Email : info3@greentpu.com
Add:No. 11, Wentang North Road, Wenzhou Road, Dongcheng Dist., Dongguan, Guangdong, China
(Old address:No. 232, Wentang North Road, Wenzhou Road, Dongcheng Dist., Dongguan, Guangdong, China)
· Sample thickness, width to write clearly.
· Sample color and surface effect to be noted.
· Sample hardness and special requirements Please note.
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