A radiation curable coating is a polymer that is cured by ultra-violet light or electron beam radiation. This coating can be applied to a variety of materials, including paints, adhesives, inks, and electronics. The high-intensity radiation curing process is used to crosslink a coating formulation. Its applications span the manufacturing of consumer electronics, household appliances, and packaging.
Conventional radiation-curable coating systems are composed of an acrylic diluting monomer, an oligomer, and a photocatalyst. While these systems have the characteristics of a Newtonian fluid, they are unable to be applied in thick layers or to non-horizontal surfaces. They also have a tendency to run before curing. This results in limited applications, such as coating three-dimensional objects. According to Coherent Market Insights the Radiation Curable Coating Market to Global Industry Insights, Trends, Outlook, and Opportunity Analysis, 2022-2028. A radiation-curable coating composition can include an antimicrobial agent that inhibits microbial, fungal, or bacterial growth. The antimicrobial agent is capable of migrating to the coated surface, and creates a concentration gradient that controls the growth of microorganisms on the coated surface. The antimicrobial agent can also provide wood surfaces with antimicrobial characteristics. Along with its antimicrobial properties, it is also free of volatile organic solvents, so it is safe to use in food and healthcare applications. Besides combining the unique properties of a hard scratch-resistant coating with the unique optical qualities of a radiation-curable coating, the new technology could also enable the development of more advanced materials for various end applications. Along with this, radiation curable coatings could also expand into new markets. This technology is an excellent alternative to traditional paints for a variety of end applications. The potential for new materials is enormous. Essentially, a radiation curable coating is composed of a mixture of monomers, accelerators, and secondary photoinitiators. This blend then includes a cross-linking agent that has two or more radiation curable functional groups. UV light is then applied to the coating. The cross-linking agent helps reduce the viscosity of the radiation curable coating. A radiation-curable coating should be cured for a maximum of 24 hours before use. The radiation curable coating is a thin film that has antimicrobial and anti-microbial properties. The coating is applied to a substrate in a microwave oven and cured with UV light. The radiation-curable coating also includes diluents, plasticizers, antioxidants, and colorants. During the process, the coating is exposed to an ultraviolet light source and inhibits the growth of bacteria, including Staphylococcus aureus and Klebsella pneumoniae. It is important to remember that there are two main types of radiation-curable coatings. Actinic-radiation curing uses a UV or visible light source to cure the resin system at high speed at room temperature. It is also important to note that both methods use a reducing amount of volatile organic compounds. While radiation-curable coatings are readily available, information regarding high-build, doming, and UV curing resins is scarce. Another method of curing coatings is by the use of actinic-radiation-curable polymers. These polymers are combined with another polymer such as two-component urethane, epoxy, and moisture-curing silylated resins. The actinic-radiation-curable polymer is used in doming compositions. In some cases, a second polymer is used to make the coating.
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