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As one of the most common areas of photocurable products, UV-curable inks have the advantages of fast curing speed, high production efficiency, low energy consumption, and no VOC emissions.
It is composed of oligomers, reactive diluents, photoinitiators and various A homogeneous mixture of various additives.
Green and environmental protection, as the biggest feature of UV inks, has been developed on a large scale in various printing industries.
Runao Chemical has successfully developed a high-adhesion resin-LuCure5220, which is a bifunctional polyester acrylate com" href="">coating online coatingol.
com .
testing method:
In the transparent varnish system, a single resin is used with a small amount of acrylate monomer and an appropriate amount of photoinitiator to test the performance difference;
In the color ink system, use a single resin with an appropriate combination of diluent and photoinitiator, and add four-color pigment powder, and grind into the corresponding ink system to investigate the curing speed, adhesion, fluidity, pigment wettability and other properties of the resin .
Through experiments, LuCure5220 has the following characteristics:
Adhesion
Adhesion refers to the bonding force between the ink layer and the substrate.
There are many factors that affect the adhesion of the ink, mainly including the pretreatment of the substrate, surface tension, viscosity, and the choice of oligomers and reactive diluents in the ink formulation.
Pigment wettability
LuCure 5220 not only has excellent adhesion, but also has good pigment wetting properties.
We have tested the pigment wettability and fluidity of the resin for the basic four colors.
The resin is not only inked during the three-roller grinding process.
Smooth and fluidity is also very good.
Flexibility
LuCure5220 is cured after rolling on the plastic film, and it breaks repeatedly without ink explosion.
As a two-functional polyester resin, the curing shrinkage is small, and it can be used in the field of bending resistance testing with extremely high requirements.
Tinting strength
Reasonable tinting strength is achieved by the proportion of pigments in the ink.
Insufficient or excessive pigment will have an impact.
Therefore, the best pigment ratio means that the ink can be smoothly transferred to the substrate and meet the color requirements and the control requirements of dot expansion.
