Views: 73 Author: Best Electronic Adhesives Glue Manufacturer Publish Time: 2022-08-10 Origin: https://www.deepmaterialcn.com/
UV curing optical adhesives glue and their benefits for metal to plastic bonding in miniled and lcd industry
These UV-curing adhesives use UV (ultraviolet) light or other types of radiation sources to start the curing process and create permanent bonds without the need for heat. The visible light or UV polymerizes or cures a combination of oligomers or monomers within the adhesive. This type of adhesive is also called radcure or radiation curing adhesives because UV is a radiant energy source.
Another type of curable adhesive under this category is electron beam curable adhesive. The radiation or light sources used in the UV curing process include lasers, LEDs, pulsed xenon lamps, and medium pressure mercury lamps.
The UV curable adhesives consist of additives, photoinitiators, oligomers, monomers, and UV transparent fillers.
The photoinitiator generates some actions or free radicals once it is exposed to the light. This initiate crosslinking between the sites in the oligomers and the monomers.
Benefits associated with the UV curing optical adhesives
One of the greatest things about UV-curing optical adhesives is that they can cure rapidly without any heat. This means you save on energy and gain as far as productivity is concerned. This saving happens because the delays needed to effectively cure adhesives are eliminated. The thermally cured adhesives often take hours to complete the process, while the UV option can take minutes or even seconds. The ovens are very costly.
These adhesives may become 100% solids after curing. This is to say that all that adhesive can be converted to form a solid joint. Because of this, no solvents or water are released, which means safety for the environment and no flammable fumes. Also, The parts that are solvent or water solvent are kept safe.
UV curing optical adhesives are compatible with metal, glass, fabric, concrete, composite material, ceramic, wood, rubber, plastic, and paper.
Various chemical systems are used for the UV curing adhesive, most of which are polymer-based. The available choices include vinyl, styrene copolymer, silicone, polyester, epoxy polybutadiene, and acrylic.
The UV curing adhesives have greater issues as far as regulations and the environment are concerned. Some UV-curing optical adhesives also come with modifiers, like chopped fiber reinforcements, pigments, and fillers. Yet others with resins are solvent-based and use a volatile organic compound to alter their viscosity.
UV curing optical adhesives' physical and processing properties include the gap or spacing between the sealant or adhesive and the substrate. It also includes the gap fill and viscosity, a measurement of the adhesive flow resistance.
When you are picking a UV curing optical adhesive, you have to consider the cure time, curing or setting time is often needed to fully set or cure a bond system. In the UV curing optical adhesive, the cure time is very rapid. In other systems, time may vary, but this depends on the actual temperature.
Some UV-curing adhesives will bond as soon as UV light is applied. Others require some more time to fully set. The longer cure times are required when the curing temperatures are lower.
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