What are the differences between various invisible car film TPU substrates（2）
2023-10-31
Characteristics of PU materials
PU material: In terms of performance, it is much better than TPH, and its tensile and softness have also been improved by one level compared to TPH. However, due to the unstable molecular structure, poor heat resistance, and weak resistance to corrosion, there are currently few factories producing and selling.
Characteristics of TPU materials
TPU material: Currently, the mainstream invisible car clothing in the industry uses TPU (Thermoplastic Polyurethanes) material as the substrate, with the Chinese name being thermoplastic polyurethane elastomer rubber. It is a polymer material formed by the reaction and polymerization of diisocyanate molecules such as diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI), as well as macromolecular polyols and low molecular polyols (chain extenders).
TPU material has excellent performance and recyclability, making it a mature and environmentally friendly material. Currently, it has been widely used in healthcare, electronics, industry, and sports. The emergence of TPU invisible car clothing has solved the usage problems of PVC car clothing. The hardness range of TPU material ranges from ShoreA 60 to ShoreD 80, and it has high elasticity within this range. TPU also maintains stability and flexibility in the temperature range of -40~120 ℃. Therefore, the invisible car vest made of TPU can effectively resist scratches caused by foreign objects and has the ability to repair after scratching.
By coating the surface of TPU substrate with a nano coating structure, it can effectively prevent pollution and corrosion, and protect the car paint from the erosion of bird droppings, oil stains, and acid rain. In addition to its performance advantages, the popularity of TPU invisible car clothing also benefits from its excellent performance in construction. Its softening characteristics at higher temperatures, combined with its strong toughness and stretchability, can easily achieve a seamless edging effect. However, there are also differences between aromatic and aliphatic TPU stealth car suits. The molecular structure of aromatic TPU materials is unstable, prone to yellowing and aging; The physical and chemical properties of aliphatic TPU materials are very stable, which can effectively solve the yellowing problem and have strong weather resistance.
Although the price of TPU invisible car clothing is higher than that of PU and TPH, it cannot achieve the user experience and service life of PU and TPH. Especially for invisible car jackets made of aliphatic TPU materials, their excellent transparency can increase the brightness of the paint surface by about 30%, and they can usually be used for 5-10 years, making them highly cost-effective.
Aliphatic thermoplastic polyurethane (TPU) is a new type of elastomer material, which has changed a series of problems such as low transparency, weak light stability and yellowing of traditional aromatic TPU. It is a product that can maintain its own color and transparency for a long time, and has good yellowing and aging resistance. The aliphatic TPU materials on the market include three types: polyester, polyether, and polycaprolactone. Only aliphatic TPU based on polycaprolactone is the correct choice for PPF application. It not only has the mechanical strength and high temperature resistance of polyester TPU, but also has the hydrolysis and low temperature resistance of polyether TPU, and it has long-term outdoor weather stability in color and mechanical properties.
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