Waterborne UV coatings can be quickly cross-linked and cured under the action of photoinitiators and ultraviolet light. The biggest advantage of water-based resins is that the viscosity is controllable, clean, environmentally friendly, energy-saving and efficient, and the chemical structure of the prepolymer can be designed according to actual needs. However, this system still has shortcomings, such as the long-term stability of the coating water dispersion system needs to be improved, and the water absorption of the cured film needs to be improved. Some scholars have pointed out that the future water-based light curing technology will develop in the following aspects.
(1) Preparation of new oligomers: including low viscosity, high activity, high solid content, multifunctionality and hyperbranching.
(2) Develop new reactive diluents: including new acrylate reactive diluents, with high conversion rate, high reactivity and low volume shrinkage.
(3) Research on new curing systems: In order to overcome the defects of incomplete curing sometimes caused by limited UV light penetration, dual curing systems are used, such as free radical photocuring/cationic photocuring, free radical photocuring, thermal curing, free radical photocuring, and free radical photocuring. Based on photocuring/anaerobic curing, free radical photocuring/moisture curing, free radical photocuring/redox curing, etc., the synergistic effect of the two can be fully exerted, which promotes the further development of the application field of waterborne photocurable materials.
Post time: Sep-28-2022