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The solution to the problem of residual adhesive of PET protective film: After using the protective film of PET, after uncovering the protective film of the surface of the object to be protected, residual pressure-sensitive adhesive is found on the protected surface and cannot be easily removed. The most difficult problem of residual glue in the production and use of protective film manufacturers. It not only destroys the appearance of the article, but also causes the pollution of the protected material. So why does the surface protective film have residual glue? There are usually three situations for residual glue: 1. Cohesive damage: both the protected surface and the substrate have pressure-sensitive adhesive, and the protective film coating surface loses luster; 2. Adhesive base damage: there are more rubber residues on the protected surface , The base material can be seen on the rubberized surface of the protective film; 3. Migration residue: There is a small amount of pressure-sensitive adhesive residue on the protected surface, and the gloss of the rubberized surface of the protective film remains good. The reasons for participation are more complicated. Different mechanisms have created the above three situations of residual glue. One of the more common reasons is that the peel strength of the protective film has changed after a period of time. After the protective film is attached to the protected material, It takes a period of time to be peeled off. The short one is only a few minutes, and the long one is more than 1 year, most of which are 3-12 months. During this period of time, the peel strength of the protective film tends to increase over time. Increase, usually fast first, then slow, and finally stabilize. When the peel strength rises to exceed the cohesive strength or the adhesion strength, cohesive failure or adhesion failure will occur, resulting in residual glue. Another reason is the aging of the PET protective film. The protective film is composed of a plastic substrate and a pressure-sensitive adhesive, both of which belong to high molecular polymers. The main aging mechanisms are heat aging and ultraviolet light aging. After the protective film is aged, the macromolecular chains that constitute the substrate and the pressure-sensitive adhesive are broken, the average molecular weight is reduced, and the cohesive strength is reduced accordingly, and then cohesive failure occurs. Compatibility with the surface material of the protected item is also an important factor causing residual glue. According to the principle of similarity and compatibility, substances with similar structures and properties are likely to be compatible. Over time, due to the compatibility phenomenon between the pressure-sensitive adhesive and the protected surface, the two gradually fuse, causing the peeling strength to increase, causing cohesive damage or sticky base damage; or some small molecules in the pressure-sensitive adhesive layer The substance is compatible with the protected surface and thus migrates from the pressure-sensitive adhesive to the protected surface, causing migration residue. For example, acrylic paint surface protective film, this is the occasion where the acrylic pressure-sensitive adhesive protective film is prone to residual glue. In addition, when the floor paint is not completely dry, sticking a protective film, the phenomenon of glue residue is also easy to occur. The stretching effect in the sheet bending process is easy to cause the damage of the sticky base during the stretching process, and this situation is also prone to residual glue. The protective film is also affected by temperature. In a low temperature environment or when the protective film is quickly removed, it is easy to cause cohesive damage and residual glue.