Benzophenone-3 131-57-7

UV-9 UV absorber is a light yellow or white crystalline powder, also known as sunscreen agent No. 2, BP-3, suitable for polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, unsaturated polyester, ABS resin and cellulose resin and other plastics, with a maximum absorption wavelength range of 280-340 nanometers, and a general dosage of 0.1-1.5%. It has good thermal stability and does not decompose at 200°C. This product hardly absorbs visible light, so it is suitable for light-colored transparent products. This product can also be used in paints and synthetic rubber. It is a broad-spectrum UV absorber with the advantages of high absorption rate, non-toxicity, non-teratogenicity, good light and heat stability, etc. UV absorber UV-9 can absorb UV-A and UV-B at the same time. It is a Class I sunscreen approved by the US FDA and is used frequently in the United States and Europe. UV-9 is widely used in sunscreen creams, creams, honey, lotions, oils and other sunscreen cosmetics. It can also be used as an anti-discoloration agent for products that change color due to photosensitivity. In addition, because UV-9 has good compatibility with many plastics and resins, it is usually used in PVC and unsaturated polyesters. In the production process, mixed acid is used as a catalyst to condense trichloromethylbenzene and resorcinol in water to form the intermediate 2,4-dihydroxydiphenyl ketone. Then, under the action of a phase transfer catalyst, dimethyl sulfate is used to etherify the target product, UV absorber UV-9. Author: Meng Bo Liu Yuying Zhou Li Author unit: Shandong University of Technology, School of Chemical Engineering, Shandong, Zibo, 255049 Common UV absorbers Salicylate phenyl ester (ingredient: o-hydroxybenzoic acid phenyl ester), UV absorber UV-P (ingredient: o-hydroxybenzoic acid phenyl ester) UV absorber UV-O (ingredients: 2,4-dihydroxybenzophenone), UV absorber UV-9 (ingredients: 2-hydroxy-4-methoxybenzophenone), UV absorber UV-531 (ingredients: 2-hydroxy-4-octyloxybenzophenone), UV absorber UVP-327 (ingredients: 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole), UV absorber RMB (ingredients: monobenzoic acid resorcinol Ester), light stabilizer AM-101 (ingredients: 2,2'-thiobis(4-tert-octylphenoloxy)nickel), light stabilizer GW-540 (ingredients: tris(1,2,2,6,6-pentamethylpiperidinyl)phosphite), light stabilizer 744 (ingredients: 4-benzoyloxy-2,2,6,6-tetramethylpiperidine), light stabilizer HPT (ingredients: hexamethylphosphoric triamide) Storage UV absorber UV-9 is non-toxic, non-flammable, non-explosive, non-corrosive, and has good storage chemicalbook stability. UV absorber UV absorber is a light stabilizer that can absorb the ultraviolet part of sunlight and fluorescent light sources without changing itself. Protect plastics from photo-oxidative degradation caused by ultraviolet radiation, thereby greatly extending the service life of the product. Plastics and other polymer materials produce auto-oxidation reactions under sunlight and fluorescence due to the action of ultraviolet rays, resulting in degradation of polymers and deterioration of appearance and mechanical properties. After adding the ultraviolet absorber, it can selectively absorb this high-energy ultraviolet light, turning it into harmless energy and releasing or consuming it. Different types of polymers have different wavelengths of ultraviolet light that deteriorate them. Different ultraviolet absorbers can absorb ultraviolet light of different wavelengths. When using, ultraviolet absorbers should be selected according to the type of polymer. Ultraviolet absorbers should meet the following conditions: ① can strongly absorb ultraviolet light (especially wavelengths of 290-400nm); ② good thermal stability, even during processing, it will not change due to heat, and the thermal volatility is small; ③ good chemical stability, no adverse reaction with the material components in the product; ④ good miscibility, can be evenly dispersed in the material, no frost, no exudation; ⑤ the absorber itself has good photochemical stability, no decomposition, no discoloration; ⑥ colorless, non-toxic, odorless; ⑦ resistant to immersion; ⑧ cheap and easy to obtain. Ultraviolet absorbers can be divided into the following categories according to their chemical structure: salicylate, benzophenone, benzotriazole, substituted acrylonitrile, triazine and other categories. Ultraviolet absorbers are used in plastics, coatings, dyes, car windshields, cosmetics, drugs, sunscreens, etc. Chemical properties Pale yellow crystalline powder, easily soluble in organic solvents such as ethanol and acetone, insoluble in water Uses Used in plastics, chemical fibers, paints and petroleum products, especially suitable for light-colored transparent products Uses Can be used in paints and various plastic products, especially effective for polyvinyl chloride, polyester, acrylic acid, resin, polystyrene and light-colored transparent furniture, and is a good cosmetic additive. Dosage 0.1-0.5%. Uses Cu (II) gravimetric determination reagent Uses Ultraviolet absorber UV-9 is a broad-spectrum ultraviolet absorber with the advantages of high absorption rate, non-toxicity, non-teratogenicity, good light and heat stability, etc. It can absorb UV-A and UV-B at the same time. It is a Class I sunscreen approved by the US FDA. It is used frequently in the United States and Europe. It is widely used in sunscreen creams, creams, honey, lotions, oils and other sunscreen cosmetics. It can also be used as an anti-discoloration agent for products that change color due to photosensitivity. Uses: Benzophenone ultraviolet absorbers are excellent stabilizers for synthetic plastics such as polyethylene. The dosage is 0.5-1.5%. They can also be used in paints, pigments, coatings, refined white wax and daily cosmetics.