UV absorber is a light stabilizer that can absorb the ultraviolet part of sunlight and fluorescent light sources without changing itself . Since sunlight contains a large amount of ultraviolet light that is harmful to colored objects, its wavelength is about 290-460 nanometers. These harmful ultraviolet light causes the color molecules to eventually decompose and fade through chemical oxidation-reduction (Redox reaction). Prevent harmful ultraviolet light. The ways in which light destroys color are both physical and chemical. Here we only briefly introduce chemical methods, that is, using ultraviolet absorbers to effectively prevent or weaken the color damage of protected objects.
UV absorbers should meet the following conditions
①Can strongly absorb ultraviolet rays (especially the wavelength of 290-400nm);
②Good thermal stability, will not change due to heat even during processing, and has low thermal volatility;
③Good chemical stability and no adverse reactions with material components in the product;
④Good miscibility, can be evenly dispersed in the material, no blooming, no bleeding;
⑤The absorber itself has good photochemical stability and does not decompose or discolor;
⑥Colorless, non-toxic, odorless;
⑦resistant to soaking and washing;
⑧Cheap and easy to obtain;
⑨Insoluble, or poorly soluble in water.
10. Ultraviolet absorbers can be divided into the following according to their chemical structure Several categories: salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amines.
BASF’s UV absorber TinuvinP is a light stabilizer for plastics and other organic substances,
Physical shape: white to light yellow powder
Content: 99%,
Molecular formula: C13H11N3O
Application industries: plastic industry, powder coating industry, coating and ink industry. Characteristics BASF light stabilizer UV-P is a light stabilizer for plastics and other organic substances. It can protect against degradation caused by ultraviolet light, thus slowing down the yellowing of plastics and the decline in mechanical properties.
Suitable for polyvinyl chloride, polystyrene, polyester and acrylic resins, vinyl and vinyl/acrylic polymers, polyurethane, polycarbonate and fiber acids ester. BASF UV Absorber P can be used together with antioxidants and other light stabilizers to increase the light and thermal stability of UV-P on plastics.
It protects against degradation caused by UV light, thereby slowing down the yellowing of plastics and the decline in mechanical properties. Its mechanism of operation is to selectively absorb ultraviolet light from sunlight and artificial light (the main cause of plastic degradation) and turn it into harmless heat energy. Recommended for PVC, polystyrene, polyester and acrylic resins, vinyl and vinyl/acrylic polymers, polyurethane, polycarbonate and fiber esters. TinuvinP can be used together with antioxidants and other light stabilizers to increase the light and thermal stability of TinuvinP to plastics.
BASFUV absorberTinuvin P will form highly colored complexes with iron or cobalt ions. In this case we recommend Tinuvin 320 or Tinuvin 327. Oxidizing and reducing agents during polymerization and curing do not affect the stability of TinuvinP. TinuvinP has good thermal stability and can be used for high-temperature processing of plastics such as polycarbonate under normal processing conditions.
BASF UV absorbers, light stabilizers: C81, 770, 622, 944, 326, 329, 791, UV-P, 783, 123, 292, 400 ,1130,328,384-2,900,5151,5060,477,479,3039,3035.
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