What are the functions and applications of UV?
Time:25.04.2021Reading times:662
What is the effect of ultraviolet rays?
The function of ultraviolet rays mainly includes sterilization, health care, promoting the production of vitamins, decomposing fume and decomposing organic matter.
1. Sterilization. Ultraviolet sterilization, short wave ultraviolet rays have a strong destructive power on microorganisms. When ultraviolet rays in this band irradiate the bacteria, nuclear protein and DNA of cells absorb energy in this band strongly, and the chain between them is opened and broken, which causes bacteria to die. For example, the air and food are sterilized with ultraviolet mercury lamp or metal halide lamp.
2. Health care. The health care effect of ultraviolet rays on human body. After the ultraviolet radiation of 280-320 nm, it can cause the photochemical process and photoelectric reaction of skin body, and make the skin produce many active substances, thus playing a health and health role. The function of advanced nerve was regulated by ultraviolet irradiation, sleep was improved and blood pressure was reduced. Regular ultraviolet irradiation can enhance the phagocytosis of white blood cells and enhance the immune function of human.
3. Promote the production of vitamins. Sun exposure is a source of vitamin D. Another source of it is food. For example: ultraviolet rays in the sun are important factors in promoting the production of vitamin D in mushrooms. Whether it is the mushroom after picking or not picking, it has this function. So fresh mushroom should be sun dried, vitamin D effect is good.
4. Break down the smoke. The molecular chain of oil is changed by ultraviolet light. At the same time, the ultraviolet light reacts with oxygen in the air to produce ozone, which makes the oil molecules cold burning to generate carbon dioxide and water. The organic matter in the oil fume is photolysis and oxidation, and the odor is eliminated.
5. Decompose organic matter. A small amount of nano titanium dioxide powder is added (or coated) on the surface of building materials or household electrical materials to adsorb VOC (such as formaldehyde, benzene, toluene, ethanol, chloroform, etc.) and can be decomposed after ultraviolet irradiation.
What are the applications of ultraviolet rays?
1. Microelectronics industry UV light curing application: cell phone component assembly (camera lens, receiver, microphone, shell, LCD module, touch screen coating, etc.), hard disk head assembly (fixed gold wire, bearing, coil, chip bonding, etc.), DVD / digital camera (lens, lens bonding, circuit board reinforcement), motor and component assembly (wire, coil fixing, etc.), Fixed coil end, PTC / NTC component bonding, transformer core protection, semiconductor chip (moisture proof protective coating, crystal mask, crystal pollution test, UV tape exposure, crystal polishing inspection), sensor production (gas sensor, photoelectric sensor, optical fiber sensor, photoelectric encoder, etc.)
2. Leduv light curing application in PCB industry: fixed components (capacitance, inductance, various plug-ins, screws, chips, etc.), moisture-proof potting and core circuit, chip protection, anti-oxidation coating protection, circuit board type (angle) coating, ground wire, flying wire, coil fixing, wave peak welding through hole mask.
3. Photoresin hardening application: UV curing resin is mainly composed of oligomers, crosslinkers, diluents, photosensitizers and other specific additives. It is used to irradiate the polymer resin with ultraviolet light, which makes it cross-linked and solidify instantly. Under the irradiation of UVLED UV light curing machine, the curing time of UV curing resin does not take 10 seconds at all, and can be cured in 1.2 seconds, which is much faster than the traditional UV mercury light curing machine. At the same time, the heat is better than UV mercury lamp. By different composition of UV curing resin, products meeting different requirements and uses can be produced. At present, UV curing resin is mainly used for wood floor coating, plastic coating (such as PVC decorative board), photosensitive ink (such as plastic bag printing), electronic product coating (marking and circuit board printing), printing and polishing (such as paper, poker board light), metal parts (such as motorcycle parts) coating, optical fiber coating, photoresist and coating of precision parts, etc.
After the above description, people have a deep understanding of the role of ultraviolet and what are the applications of ultraviolet. In fact, people should know more about the existence of ultraviolet rays, only the existence of UV, then in the ordinary can better apply. UV applications will bring people different experiences, make life better, let people live more moist.
