Introduction to the application of water-based polyurethane in PET film processing-technical knowledge

Introduction to the application of water-based polyurethane in PET film processing. Source: Protective film factory direct sales. Release time: 2019-03-04 Click: 2598 Due to the low surface energy of PET film, the use of PET film is limited. In order to improve the surface performance of PET film to improve printing The adaptability and the bonding force of the vacuum aluminized layer, corona treatment is usually used to increase the surface tension of the film. However, the corona method has problems such as timeliness, especially in a high temperature and high humidity environment, the tension of the film after the corona treatment is easily attenuated. However, the chemical coating method does not have such a problem, so it is favored by the printing industry and the aluminum plating industry. Usually water-based polyurethane emulsions can be used for processing. Water-based polyurethane applications are used for PET coatings. They have excellent adhesion to PET materials. They can be used as PET packaging ink connection adhesives, PET food packaging adhesives, and PET Packing aluminum foil connection adhesive and so on. In the Foshan Polyva Laboratory to test the adhesion of water-based polyurethane on PET film, to coat the surface of the PET film, first adjust the water-based polyurethane emulsion to a proper viscosity, and add leveling, wetting, defoaming and other related aids. After drying, the 3M tape cannot lift the water-based polyurethane film coated on the PET surface. It can be seen that the water-based polyurethane has excellent adhesion fastness to the PET surface.