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UV curing waterborne coating


UV curing waterborne coating

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  UV-curing water-based coatings combine the advantages of water-based coatings and photo-curing coatings, and have been rapidly developed in recent years, and are also one of the main development directions of light-curing coatings in the future. The advantage of UV-curable waterborne coatings is that oligomers with high molecular weight can be used to improve adhesion to certain substrates (such as metals) and improve other physical properties of cured films, unlike traditional UV coatings. The relative molecular mass of the oligomer is limited by the viscosity of the application; the viscosity of the system can be adjusted with water without diluting the monomer, so that the shrinkage caused by the active diluent monomer can be avoided; in this way, extremely thin can be obtained. Coating, and the equipment is easy to clean; after drying, the dry coating can be obtained before irradiation, which can be used for surface solidification of three-dimensional objects, and the coating that is dried before the irradiation reduces dust. Adsorption and repair of defects in the coating prior to curing. The disadvantage of this technology is that it must be dehydrated and dried before photocuring, the system has low gloss, poor solvent resistance and poor scratch resistance. In fact, the "water-based" system is not suitable for all fields, and the "water-based" system is not truly environmentally friendly, because it can dissolve or disperse in water when cleaning water-based inks or coatings. Removed, and compounds such as acrylics are very harmful to fish and other aquatic organisms.

  UV-curable water-based coatings are environmentally friendly and have a fast curing rate that meets the requirements of the times. In developed countries such as Europe and the United States, Hoechst, UCB, ICI, Zeneca, BASF and other companies have launched their photocurable waterborne coating products. The current technical deficiencies mainly include: the long-term stability of the coating water dispersion system needs to be improved, there are not many varieties of photoinitiators to choose from, most of which use traditional photoinitiators, and for pigment pigmented coatings, the choice is smaller, additional The dry water removal device has an adverse effect on the promotion and application of the technology. Therefore, it is imperative to continue to carry out basic research, to develop strengths and weaknesses, and to expand its application fields. It is still a top priority for the development of water-based light-curing coating technology. Y. b. Kinm et al. developed a polyurethane water-based coating with special properties by cationic electrodeposition. This method can greatly shorten the time of water evaporation in the coating, and solves the long process of water-based coating. Disadvantages.