UV is a kind of coating that can quickly cure into a film in a few seconds under the irradiation of ultraviolet (UV). UV coating is automatically rolled and sprayed on the furniture board through machinery and equipment. Under the irradiation of ultraviolet light, it promotes the decomposition of initiator, generates free radicals, triggers resin reaction, and instantly solidifies into a film without solvent volatilization. Therefore, it is more efficient, green and environmental friendly.
Under the general trend of hydration, Waterborne UV coatings are also successfully applied in wood, plastic, printing, daily chemical and other fields because of their environmental friendliness and construction friendliness. Raw materials play an important role. The continuous innovation of the performance, characteristics and application solutions of waterborne coatings promote the process of resin hydration.
1 epoxy acrylate / polyurethane acrylate composite system
Photosensitive oligomer is the main part of UV cured resin, which determines the basic properties of cured resin. All kinds of matrix resins have their irreplaceable advantages, but they will inevitably have defects. For example, epoxy resin based curing film has high hardness, good adhesion, high gloss and excellent chemical resistance, but it has the disadvantage of poor flexibility. Another example is that polyurethane based resin has excellent properties such as wear resistance and scratch resistance, but its weather resistance is insufficient. Researchers use blending or hybrid methods to combine the two, so as to make up for the deficiency of a single resin and develop a system with both excellent characteristics.
2 dendritic or hyperbranched system
Waterborne UV curable dendrimers or hyperbranched oligomers are a new kind of polymers with spherical or dendritic structure and no entanglement between molecular chains. Moreover, the highly branched polymer structure contains a large number of active end groups. These active end groups are modified to adjust the properties of the polymer and apply it to specific fields. Compared with linear polymers with the same molecular weight, hyperbranched oligomers have excellent properties such as low melting point, low viscosity, easy dissolution and high reactivity. They are ideal materials for waterborne light curing matrix resins. The water-based hyperbranched polyester composed of polyhydroxy functional aliphatic polyester as the core can reduce the dilution water and show a good viscosity reduction effect because of its good water solubility and low viscosity.
3 epoxy soybean oil acrylate
Epoxy soybean oil has the advantages of low cost, environmental protection, long molecular chain and moderate crosslinking density. It can significantly improve the flexibility and adhesion of the coating. In recent years, it has become a research hotspot in the field of coatings at home and abroad. Good achievements have been made in epoxy soybean oil acrylate and modified epoxy soybean oil acrylate UV free radical curing coatings in China. Cub company in the United States has carried out commercial production, such as ebercy860. The synthesis method of epoxy soybean oil acrylate is generally semi ester modification method, which is to esterificate epoxy soybean oil with acrylic acid.
Post time: May-25-2022