What is a UV absorber?
The sun creates a wide range of light frequencies, visible and invisible to people. One range of frequencies that can damage the skin and human materials is the ultraviolet (UV) light or light with frequencies higher than the visible purple range. Ultraviolet light can cause cancer in people with repeated long -term exposure and chemically degrade plastics and other materials. UV absorber can be added to sunscreen or produced products that absorb or reflect harmful UV light. Most ultraviolet light that reaches the Earth's surface is classified as UVA and all types can be harmful. UVA light has the longest frequency range and has been shown to penetrate further into human skin, which potentially causes the greatest damage. It was believed that UVA light was the primary cause of human skin cancer, but research at the end of the 20th century showed the relationship of UVB to Cancer development as well.
UV absorber can provide protection by one of the two ways. Solids, asIt is ubórová black, titanium dioxide and zinc oxide, reduce UV light either by absorbing in the case of carbon black, or reflecting them in the case of two oxides that are pure white. Suning creams, colors and some plastics use combinations of titanium or zinc oxides to ensure protection. Tires and rubber products can use carbon black to protect against light damage.
Organic chemicals may provide UV protection by chemically absorb UV radiation and heat generation. These materials do not affect the transparency or transmission of the material of the materials. They are commonly used in clean or translucent plastics, adhesive and pure koat colors. Organic absorbers not to respond chemically with materials that protect.
Another class of compounds used together with IS UV stabilizers. These chemicals are usually classified as defended amin stabilizersThe light (HAL) that chemically react with molecules made of UV responses with materials. HALS acts as harmful molecules that can attack and degrade plastics or other products. The UVS absorber and stabilizer can be added to the product formulation to ensure optimum protection.
Lead oxide has been used in colors as a dye and UV absorber for centuries until the research in the 20th century showed the relationship between lead color and disability in children. Most domestic colors now use titanium dioxide, mineral made of natural sand bearings, such as bleaching agent and UV protector. Calling oxides of the mineral oxides UV absorber is possible because they are reflectors that distract incoming light. However, the effect is the same and titanium dioxide is effective in reducing ultraviolet light damage.