What is UV (ultraviolet) radiation?
Electromagnetic waves with wavelengths ranging from 10 to 380 nm.Wavelengths shorter than visible light and longer than X-rays.It stands for Ultraviolet and is broadly classified into UV-A, UV-B, and UV-C according to wavelength.UV-A, in the 315-380 nm wavelength range, is virtually unabsorbed by the atmosphere, so 99% of UV-A reaches the earth's surface.Because of its long wavelength, it penetrates deep into the skin, causing spots and freckles, and is used for UV curing and photochemical reactions.UV-B, in the wavelength range of 280-315 nm, is strongly absorbed by the ozone layer 20-50 km above the ground, and part of it reaches the earth's surface.It is absorbed on the surface of the skin, causing sunburn and other diseases such as skin cancer and cataracts.UV-C does not reach the earth's surface because it is strongly absorbed by atmospheric oxygen and ozone in the wavelength range of 200 to 280 nm.It is the most harmful type of ultraviolet light because of its short wavelength and high energy, which is absorbed by the DNA of living organisms. It is used for sterilization and decomposition of organic matter.
Where is UV (ultraviolet) light utilized?
UV (ultraviolet) irradiation can decompose and remove ultrafine contaminants from the surface of materials. This technology is also expected to lead to the expansion of applications for various materials because it can also modify resin surfaces.
What are the main applications of UV?
（Cleaning）Precision cleaning of LCD glass substrates and semiconductor electronic components,Others.
（modifying）Hydrophilic treatment of various materials, surface modification of resins such as engineering plastics before bonding,Others.
How does UV (ultraviolet) cleaning work?
Oxygen is decomposed by the powerful energy of 184.9nm, and "reactive oxygen species" or "ozone" with strong oxidizing power is generated. The generated ozone can also be decomposed at 253.7nm, creating an environment rich in reactive oxygen species, which are continually decomposed and combined within the range where radiation at 253.7nm and 184.9nm is possible.
What are reactive oxygen species?
The term refers to chemical species in which oxygen has become chemically active and is generally very unstable and exhibits strong oxidizing power.
How does UV surface modification work?
UV irradiation improves and enhances surface hydrophilicity by forming functional groups on the surface of resins such as plastics and rubbers. When a resin surface is directly irradiated with UV, most of the molecular bonds on the surface are broken. Active oxygen bonds are then formed on the surface of the material, which has become unstable due to the cleavage of bonds, forming functional groups such as COOH, COO, CO, OH, etc., and modifying the surface.