Ultraviolet absorbers are the most widely used type of light stabilizers. They are those that can absorb the ultraviolet part of sunlight or fluorescent sources without changing their structure. A class of substances. It can convert high-energy ultraviolet light energy into heat energy or release non-destructive longer light waves, thereby protecting materials from ultraviolet damage. According to their structure, they can be divided into salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, etc. The most commonly used in industry are benzophenones and benzotriazole. kind.
Let’s learn about the physical and chemical properties and uses of UV absorber UV-234 among benzotriazoles:
Ultraviolet absorber UV-234 It is in the form of light yellow powder. Soluble in organic solvents such as chloroform, methylene chloride, benzene, ethyl acetate, etc., slightly soluble in alcohols, and insoluble in water.
UV-234 is a hydroxybenzotriazole ultraviolet absorber that converts ultraviolet rays into heat energy through photochemical action. UV-234 has strong absorption in the ultraviolet region of 300 to 400nm, but very little absorption in the visible region. The maximum absorption peaks are 302nm (ε=17472l/mol.cm) and 343nm (ε=16128l/mol.cm).
UV-234 has good thermal stability and has good effects on polymers that need to be processed at high temperatures. Such as polycarbonate, polyester, polyacetal, polyamide, polyphenylene sulfide, aromatic copolymer, thermoplastic polyurethane, polyvinyl chloride, styrene, etc.
UV-234 has good compatibility with most polymers and low volatility, making it suitable for molds, films, sheets and fibers.
UV-234 is also suitable for high temperature resistant powder coatings, coil materials, etc. Protects materials from UV radiation.
In outdoor products, it can be used together with phenolic antioxidants and phosphite antioxidants.
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