Factors affecting the curing and drying of water-based UV ink

There are many factors that affect the curing and drying of water-based UV inks. This article only discusses the main influencing factors. These factors have the following aspects:

1. The pre-drying of the water-based system has a great influence on the light curing. When it is not dried or is not completely dried, the curing speed is slow, and the gelation rate does not increase significantly with the extension of the exposure time. This is because, although water has a certain effect on inhibiting the polymerization inhibition of oxygen, it can only cure the surface of the ink film quickly and only achieve surface drying, but not solid drying. Because the system contains a lot of water, when the system is cured at a certain temperature, with the rapid evaporation of water on the surface of the ink film, the surface of the ink film quickly solidifies, and the water in the film layer is difficult to escape, and a large amount of water remains in the ink film. This prevents further curing of the ink film and reduces the curing speed. In addition, the ambient temperature during UV irradiation has a great influence on the curing of UV inks. The higher the temperature, the better the curability. Therefore, if pre-heating is applied, the curability of the ink will be enhanced and the adhesion will be better.

2. Effect of waterborne UV curing resin on light curing

Radical photocuring of water-based UV-curable resins requires that the resin molecules must bear unsaturated groups. Under the irradiation of ultraviolet light, the unsaturated groups in the molecules cross-link with each other, changing from a liquid coating to a solid coating Floor. The method of introducing acryloyl, methacryloyl, vinyl ether or allyl is usually adopted to make the synthetic resin have unsaturated groups, so that it can be cured under suitable conditions. Propionate is highly reactive due to its high reactivity And often used. For the free radical ultraviolet curing system, as the content of double bonds in the molecule increases, the cross-linking speed of the coating film will increase, and the curing speed will be accelerated. Moreover, resins with different structures have different effects on curing speed. The reactivity of various functional groups generally increases in the following order: vinyl ether <allyl <methacryloyl <acryloyl. Therefore, the introduction of acryloyl and methacryloyl groups is the main method, so that the resin has a faster curing speed.

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