Interpretation of ultraviolet bactericidal effect

The long-term serious damage to the human body caused by ultraviolet radiation is more and more recognized by people, and the strengthening of protection against ultraviolet rays in the sun has also been paid attention to. With the widespread application of full UV protection window film, people are beginning to worry about whether the benefits of ultraviolet rays will also be shielded. The following is an explanation of the sterilization and disinfection effects of ultraviolet rays.

The sterilization and disinfection effect of ultraviolet light is related to the wavelength. The ultraviolet radiation that has the real sterilization and disinfection effect in sunlight is the UVC band (100-280nm). The ultraviolet wavelength in the range of 240-280nm can destroy and change the DNA (deoxyribonucleic acid) or DNA in bacteria and viruses. The molecular structure of RNA (ribonucleic acid) causes growth cell death and regenerative cell death, so that bacteria immediately die or cannot reproduce their offspring, thereby achieving the effect of sterilization and disinfection. This band coincides with the ultraviolet absorption and photochemical sensitivity range of deoxyribonucleic acid in the microbial cell nucleus, especially when the wavelength is 253.7, the bactericidal effect of ultraviolet rays is strong. However, most of the UVC in sunlight is absorbed and blocked by the ozone layer in the atmosphere, and it can hardly reach the ground. Therefore, for the sterilization and disinfection of ultraviolet rays, the method of artificial ultraviolet light (wavelength in the range of 240-280nm) is mainly used.

Most of the UVB ultraviolet rays in sunlight are absorbed by the ozone layer, and only 2% reaches the surface of the earth. UVB ultraviolet rays are largely absorbed by the skin epidermis and can no longer penetrate into the skin. It has an erythema effect on the human body. Short-term exposure can promote the metabolism of minerals and the formation of vitamin D in the body. Timely and appropriate amount of sunlight is good for health. 98% of the long-wave ultraviolet rays in sunlight UV-τmax band (wavelength 380nm～400nm) and UV-A band (wavelength 315nm～380nm) can penetrate the atmosphere to reach the surface of the earth, and have strong harmfulness. Ultraviolet rays have been determined to be more Diseases are related, such as wrinkles, sunburn, cataracts, skin cancer, visual damage and immune system damage. Therefore, the harmful effects of long-term exposure to ultraviolet rays in the sun are far greater than its beneficial effects.

Shanyudishan full protective skin film has excellent absorption and barrier properties to long-wave ultraviolet rays. The car glass or architectural glass is pasted with a skin care film, which can prevent 100% of long-wave ultraviolet rays from harming the human body and effectively protect human health.