Introduction of functional groups
In the preparation process of Waterborne UV coating, functional groups and polymer skeleton can be polymerized together through synthetic reaction. The commonly used functional groups are fluorine and siloxane. The addition of these functional groups can effectively reduce the surface tension of the cured film, facilitate the better adhesion between coating and coating, and increase the adhesion between paint film and substrate. In addition, due to the strong hydrophobicity of functional groups such as siloxane, the paint film also has a certain degree of hydrophobicity, which effectively improves the water-soluble performance of traditional materials and improves the water resistance and solvent resistance of the paint film.
Strengthening curing system
Generally, Waterborne UV coatings are difficult to cure, especially when used in colored systems or thick coatings. Moreover, due to the addition of photoinitiator, the Waterborne UV coating is easy to cure under ultraviolet irradiation. However, when the coating is used on more complex devices, the ultraviolet irradiation on the Waterborne UV coating is incomplete, which makes some coatings difficult to cure. Therefore, according to the current situation, researchers have developed a multi-layer curing system of Waterborne UV coatings, which effectively solves the limitations of Waterborne UV coatings and expands the application range of coatings.
Using hyperexpenditure system
Because there are many carboxyl groups in the Waterborne UV coating, the relative molecular weight of this group is large. Therefore, the viscosity of the Waterborne UV coating is relatively large, which reduces the solid content of the coating, which has an adverse impact on the paint film and reduces the gloss and water resistance of the paint film. Therefore, in order to improve this phenomenon, researchers have established a hyperbranched system in Waterborne UV coatings, improved the water resistance of the paint film through large functional groups, and used the structural characteristics of oligomers to reduce the viscosity of the system and improve the gloss of the paint film.
To sum up, due to the particularity of the constituent materials of Waterborne UV coatings, it has unique advantages compared with traditional coatings. Therefore, Waterborne UV coatings are widely used in wood and paper varnish. Due to the imperfect development of Waterborne UV coatings, researchers are still improving the performance of Waterborne UV coatings, adding functional groups to the coatings and establishing multi-layer curing system. In addition, The use of hyperbranched system in coatings is the future research direction of Waterborne UV coatings. Through continuous improvement of Waterborne UV coatings, they can have lower toxicity, greater hardness and more perfect gloss.
Post time: Jun-01-2022
