As a new car owner, when you want to paste an invisible car coat on your car, whether it is a car film store or a blogger Internet celebrity, you will emphasize that you should choose an invisible car coat made of TPU material to paste the invisible car coat.
You know why?
TPU, Chinese name for thermoplastic polyurethane elastomer rubber, is a polymer material formed by the joint reaction of diisocyanate molecules such as methylene diisocyanate (MDI) or toluene diisocyanate (TDI) and macromolecular polyols and low-molecular polyols (chain extenders).
TPU material has excellent performance and recyclability, is a mature environmental protection material, TPU material hardness range between ShoreA 60 ~ ShoreD 80, this hardness range has high elasticity. In addition, TPU can remain flexible in the temperature range of -40~120°C, which means that the invisible car clothing made of TPU can effectively resist scratches by external substances. What's more, the material is able to repair itself after being scratched, which greatly improves the service life and effectiveness of the invisible car clothing.
TPU is divided into aromatic TPU and aliphatic TPU, and aliphatic TPU has better performance in all aspects.
So is it just a matter of using aliphatic TPU?
1. Polyester type
Due to the presence of ester groups that are easy to hydrolyze, polyester TPU is susceptible to the invasion of water molecules and molecular chain breakage, and the acid generated by hydrolysis can catalyze the further hydrolysis of polyester, and the water resistance of polyester TPU is relatively poor and the cost is relatively low.
2. Polyether type
Polyether TPU, because the ether group of the soft segment is easier to rotate, has good compliance, superior low temperature performance, and there is no relatively easy hydrolyzable ester group in the polyether, and its hydrolysis resistance is better than that of polyether. However, the mechanical strength, oil resistance and heat resistance are relatively poor.
3. Polycaprolactone type
Polycaprolactone TPU is between polyester and polyether, with good comprehensive properties, excellent mechanical strength, oil resistance, chemical resistance, wear resistance and tear strength, good flexibility, superior low temperature performance, and there is no ester group that is relatively easy to hydrolyze, and its hydrolysis resistance is good.
Therefore, the water of the car coat is relatively deep, so we must confirm the material of the car coat with the merchant and verify it through various performance tests. Avoid stepping on the pit and spending money in vain.