Functional additives that can inhibit or delay the aging of organic polymer materials under ultraviolet radiation are called stabilizers. Light stabilizers can be divided into ultraviolet shielding agents, absorbers, free radical extinguishers and peroxide decomposing agents according to their different working principles.
Ultraviolet shielding agents play a role in shielding ultraviolet rays by absorbing or reflecting ultraviolet rays. Typical varieties include carbon black, iron oxide red, rutile-type Chin white powder, etc.
The UV absorber preferentially absorbs the groups that are easy to be photooxidized in the polymer molecule, selectively and strongly absorbs ultraviolet rays, and converts them into harmless low-energy materials, such as phenylacetophenones, phenylpropanoids, and aromatic esters. class etc.
