Is UV glue good or not?

What is uv glue?

The term "UV glue" generally refers to a shadowless glue, also known as photosensitive or ultraviolet curable adhesive. UV glue require curing through exposure to ultraviolet light and can be used for bonding, painting, coating, and other applications. The abbreviation "UV" stands for Ultraviolet Rays, which are invisible electromagnetic radiation with wavelengths ranging from 110 to 400nm. The principle behind the shadowless curing of UV adhesives involves the absorption of ultraviolet light by photoinitiators or photosensitizers in the material, leading to the generation of active free radicals or cations that initiate polymerization and cross-linking reactions within seconds.

 

Shadowless glue gluing process: shadowless glue is also called ultraviolet glue, it must be through ultraviolet irradiation to the glue under the premise of curing, that is, the photosensitizer in shadowless glue and contact with ultraviolet light will bond with the monomer, theoretically without the irradiation of ultraviolet light source shadowless glue will almost never cure. The stronger the UV curing speed, the faster the general curing time ranges from 10-60 seconds. Shadowless adhesive must be illuminated by light to cure, so the shadowless adhesive used for bonding can generally only be bonded to two transparent objects or one of them must be transparent, so that ultraviolet light can pass through and irradiate onto the glue.

 

UV glue characteristics

1. Environmental protection/safety

No VOC volatiles, no pollution to the ambient air; adhesive ingredients are less restricted or prohibited in environmental regulations; no solvent, low flammability

2. Easy to use and improve production efficiency

The curing speed is fast and can be completed in a few seconds to tens of seconds, which is beneficial to automated production lines and improves labor productivity. After curing, it can be inspected and transported, saving space. Curing at room temperature saves energy, such as the production of 1g light-curing pressure-sensitive adhesive. The energy required is only 1% of the corresponding water-based adhesive and 4% of the solvent-based adhesive. It can be used for materials that are not suitable for high-temperature curing. The energy consumed by ultraviolet curing can save 90% compared with thermal curing resin. The curing equipment is simple and only requires lamps or conveyor belts. Space-saving; one-component system, no mixing required, easy to use.

3. Compatibility

Materials sensitive to temperature, solvents and moisture can be used.

Control the curing, the waiting time can be adjusted, the degree of curing can be adjusted. The glue can be applied repeatedly for multiple curings. the UV lamp can be easily installed in the existing production line without major changes.

4. Extremely wide range of application and good bonding effect

UV glue has a wide range of applications and has excellent bonding effects between plastics and various materials. It has high bonding strength and can break the plastic body without degumming through destruction tests. UV glue can be positioned in a few seconds, and reach high intensity in one minute;

It is completely transparent after curing, and the product will not yellow or whiten for a long time. Compared with traditional instant adhesive bonding, it has the advantages of environmental test resistance, no whitening, good flexibility, etc. It has excellent low temperature, high temperature and high humidity resistance.