UV Coating for wood finishing
Ultra violet cured coating (UV coating) is the other answer for the requirement of paint product which is more environmental friendly. The UV coating is very less in releasing the "expensive and pollutant" solvents. It also require little energy for drying and produce a very strong film layer. The ultra violet cured coating drying very fast, he need only few minute to be dry and produce hard coating. The curing reaction stimulated and catalyzed with ultraviolet radiation. The reaction mechanism is quite complex, but it can be simply described as follow:
The coating contains a polymerized resin that will do the polymerization reaction with an energy ignition. When the coating is irradiated with the ultraviolet light with certain intensity, then free radicals that will accelerate polymerization reaction are generated. The polymerization is curing the coating to make a hard and strong film layer.
There are 3 components required for the formation of film layers, polymerized resin, photo initiator and ultraviolet light. The resin is the material that will polymerize to create a layer of film. Photo initiator is a substance that absorbs radiation from the environment into the resin to initiate polymerization reactions, with photo initiator spurred by free radicals is so fast and then formed to begin the drying reaction. The ultra violet light is the energy that a needed to initiate the reaction.
The resin material that used to make UV coating is usually oil free unsaturated polyester or acrylic. And the initiator is benzoin used for polyester and acetophenones for the acrylic. The UV coating will produce the hard and strong film coating in the finishing.
The advantages of UV coating
With less solvent releasing, this coating is also very friendly to the environment.
While disadvantage of this coating are:
The coating contains a polymerized resin that will do the polymerization reaction with an energy ignition. When the coating is irradiated with the ultraviolet light with certain intensity, then free radicals that will accelerate polymerization reaction are generated. The polymerization is curing the coating to make a hard and strong film layer.
Roller coater for UV coating application
There are 3 components required for the formation of film layers, polymerized resin, photo initiator and ultraviolet light. The resin is the material that will polymerize to create a layer of film. Photo initiator is a substance that absorbs radiation from the environment into the resin to initiate polymerization reactions, with photo initiator spurred by free radicals is so fast and then formed to begin the drying reaction. The ultra violet light is the energy that a needed to initiate the reaction.
The resin material that used to make UV coating is usually oil free unsaturated polyester or acrylic. And the initiator is benzoin used for polyester and acetophenones for the acrylic. The UV coating will produce the hard and strong film coating in the finishing.
The advantages of UV coating
- The resulting film layer is very strong and hard, resistant to scratches and solvent.
- The drying process is very fast, and does not require high temperatures
- End at relatively low cost compare with another coating.
With less solvent releasing, this coating is also very friendly to the environment.
While disadvantage of this coating are:
- This coating requires a series of machines an automatic spray and ultra-violet lamp that is expensive.
- Its uses is limited to a flat product.
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