UV glue (also known as shadowless glue, photosensitive glue, or UV-curable glue) is a type of adhesive that can only be cured through exposure to ultraviolet (UV) light. It can be used as a bonding agent, as well as a base material for paints, coatings, inks, and more. UV is an abbreviation of Ultraviolet Rays, referring to ultraviolet light. Ultraviolet light (UV) is invisible to the naked eye and is a segment of electromagnetic radiation beyond visible light, with wavelengths ranging from 10 to 400nm. The curing principle of UV glue is that the photoinitiator (or photosensitizer) in the UV-curable material absorbs UV light and generates active radicals or cations, triggering monomer polymerization and cross-linking chemical reactions, which transform the adhesive from a liquid to a solid state within seconds.
Universal products have a wide range of applications and excellent bonding effects with various materials, including plastics. They exhibit high bonding strength, achieving plastic body fracture without debonding through destructive testing. UV adhesive can be positioned in seconds and reach its maximum strength in one minute, greatly improving work efficiency. After curing, it is completely transparent, and the product remains yellow and non-whitening for a long time. Compared to traditional instant adhesive bonding, it has advantages such as environmental resistance, non-whitening, and good flexibility
Nowadays, UV adhesive has been successfully applied in many industrial assembly fields, especially in high-tech industries that require rapid assembly, such as LCD manufacturing, optical product manufacturing like cameras, optical disc manufacturing, watch manufacturing, buzzer and mobile phone button assembly, electronic circuit board manufacturing, and the manufacturing of electronic components in the optoelectronic information industry, such as the manufacturing of polarizing components.
Performance characteristics of UV adhesive:
1. Fast curing, controllable reaction; solvent-free, pollution-free; suitable for automated operations;
2. Wide range of bonding materials, high bonding strength, suitable for structural bonding, and wide application range;
3. Excellent optical performance; the glue is colorless and transparent, with a light transmittance of >90% after curing, thus it is known as shadowless glue;
4. Excellent weather resistance, no yellowing;
5. The disadvantage is that the adherend must be translucent on one side, and curing requires equipment;