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UV-328 is a light stabilizer for a variety of plastics and other organic substrates. Its use is recommended for the stabilization of styrene homopolymers and copolymers , acrylic polymers, unsaturated polyesters , polyvinyl chloride , polyolefins , polyurethanes , polyacetals , polyvinyl butyral , elastomers and adhesives . [ 5 ]
This reduces the absorption of UV rays by the polymer matrix and hence reduces the rate of weathering. Phenolic benzotriazoles (e.g. UV-360, UV-328) and hydroxyphenyl-triazines (e.g. Bemotrizinol) are used to stabilise polycarbonates and acrylics, [25] oxanilides are used for polyamides and polyurethanes, while benzophenones are used for PVC.
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UV stabilizers, such as benzophenones, work by absorbing the UV radiation and preventing the formation of free radicals. Depending upon substitution, the UV absorption spectrum is changed to match the application. Concentrations normally range from 0.05% to 2%, with some applications up to 5%. Frequently, glass can be a better alternative to ...
2-(2-Hydroxyphenyl)-2H-benzotriazoles, also referred to as phenolic benzotriazoles, are an important class of UV absorbers [1] comprising the benzotriazole building block. Structure [ edit ]
4,4'-Dihydroxybenzophenone - used as a UV stabilizer in cosmetics and plastics; Dinitrobisphenol A - a proposed metabolite of BPA, which may show increased endocrine disrupting character; HPTE - a metabolite of the synthetic insecticide methoxychlor; Others. 2,2,4,4-Tetramethyl-1,3-cyclobutanediol - next generation BPA replacement
In industrial chemistry, a stabilizer or stabiliser is a chemical that is used to prevent degradation. [1] Above all, heat and light stabilizers are added to plastic and rubber materials because they ensure safe processing and protect products against aging and weathering.
UV filters were used to filter out shorter ultraviolet wavelengths while remaining transparent to visible light. However, the modern-day photographic film and digital cameras are less sensitive to UV wavelengths. UV filters are sometimes referred to as L37 or L39 filters, depending on the wavelengths of light they filter out.