[ UV coatings ]

In general, a coating material is a material that can be applied to the surface of an object to be coated and can form a firmly adhered coating film, which can be inorganic or organic. Organic polymer coatings are the main varieties of coatings. Paint is commonly known as paint. UV coating refers to an ultraviolet resin curing coating (Ultraviolet curing coating), which is a polymer resin coating which is rapidly crosslinked at room temperature by using ultraviolet light as a curing energy source.

UV coatings are mainly composed of five parts, which are based on UV-cured synthetic resins (also known as oligomers or prepolymers), adding specific reactive diluents (also known as reactive diluent monomers) and photoinitiators ( Also known as photosensitizers, solid fillers, and a variety of additives (auxiliaries).

1. UV-curable synthetic resin (or oligomer): including unsaturated polyester, polyester acrylate, polyether acrylate, alkyd acrylate, urethane acrylate, epoxy acrylate, etc., is the main body of the coating , determining the main properties of the cured coating;

2. UV-curable reactive diluent (monomer): The active monomer mainly adjusts the viscosity of the coating and participates in the curing reaction, which affects the performance of the coating. Reactive diluents are classified into two types: monofunctional and polyfunctional:

A; the monofunctional reactive diluent is mainly styrene, acrylic monoester, allyl ether and the like. Its main function is as a viscosity reducer, which also has a certain influence on the performance of the coating.

B: The polyfunctional reactive diluent has a bifunctional group, a trifunctional group, and a polyfunctional oxime. Its function is to increase the crosslink density of the coating film without increasing the viscosity of the system. Of course, the performance of the coating film can be partially changed by selecting different types of polyfunctional reactive diluents.

3. Photoinitiator: Photoinitiator is also called photosensitizer. The role of the photosensitizer is to absorb UV energy, initiate polymerization, generate free radicals under the excitation of near-ultraviolet light, which is sensitive to light and stable to heat. Including aryl carbonyl compounds, organic sulfur compounds, organic peroxides and the like.

4, solid filler: including pigments, matting powder, wear-resistant powder.

5. Additives (auxiliaries): Different additives play different roles, such as pigments, stabilizers, including leveling agents, defoamers, dispersants, organic solvents (adjusting viscosity light, Ze etc) and so on.