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La causa dell'ingiallimento della pellicola protettiva per vernice trasparente

(1) The Yellow resistance grade of the base material determines the Yellow resistance of the clear pellicola protettiva per vernici

At present, PVC, TPH material of invisible car clothing (paint protection film) has gradually withdrawn from the market, the base material from PVC to TPU transformation, is an important step out of the whole industry, greatly improving the Yellow resistance of invisible car clothing products. Although TPU material is the most popular material at present, there are also grades.

TPU can be classified into aliphatic TPU and aromatic TPU according to the type of isocyanate. Aromatic TPU belongs to common TPU, which is not resistant to yellowing or has poor yellowing resistance. Aliphatic TPU belongs to high-quality TPU, which is resistant to yellowing or even non yellowing, so the main difference between the two is the different grades of yellowing resistance. Of course, the most important characteristic of aliphatic TPU is its resistance to yellowing.

(2) The coating can further enhance the yellowing resistance of the car clothing. Now in the production of invisible car clothing (pellicola protettiva per vernice), manufacturers will add a layer of coating material to the substrate, which is equivalent to adding a layer of protection to the car clothing, further enhancing the Yellow resistance of the car clothing. The existence of the coating can effectively isolate the influence of air, ultraviolet, pollutants and other external factors, and effectively extend the service life of the car clothing. However, the stain resistance, penetration resistance, scratch resistance, thickness, adhesion and other factors of the coating will also have a certain degree of influence on the yellowing speed of the car clothing.