Automotive paint protective film is a new type of high-performance environmental protection film, widely used in automotive beauty maintenance industry, is the general name of paint protective film (PPF). Glue, TPU base film, functional coating, release film constitute a complete paint protective film.
The base film of ppf film is usually thermoplastic polyurethane (TPU), which has the characteristics of wear resistance, self-healing, yellow resistance and ultraviolet resistance.
– The surface coating of ppf car can improve the ability of ppf envelope to resist ultraviolet aging and is not easy to discolor and yellow.
– The bonding layer of varnish protective film is generally made of high-performance acrylic pressure sensitive adhesive, the main function is to paste the paint film on the surface of the car paint, while ensuring convenient construction, lasting no dislocation, no residual glue when peeling, no damage to the paint.
The multilayer structure of PPF is formed by a coating process combining functional coating, TPU based film and pressure sensitive adhesive. The coating process can be divided into two processes: pressure sensitive bonding and functional coating:
1. Pressure sensitive adhesive coating
Usually the transfer coating method is used, the pressure sensitive adhesive is coated on the release film, cross-linked curing, and composite on the TPU film. The thickness of pressure sensitive adhesive, oven temperature, coating speed and coating defect control during coating process directly affect the coating performance of the whole vehicle.
2. Functional coating
Generally, the functional coating is applied on the other side of the TPU film by direct coating method. Coating thickness, appearance, curing and maturity are the main controlling factors in the coating process.
The above is the coating sequence used by most manufacturers, and some manufacturers will use the production process of coating functional paint and then coating pressure sensitive adhesive.
However, the completion of these two processes does not mean the end of the coating process, but also after 3 to 5 hours of second winding, automotive semi-finished coatings also need to be placed in the curing chamber, standing at 55 ° C for 12 to 24 hours, so that the glue and raw materials are fully bonded together, and the performance is more stable.https://beyondppfilm.com/
