Coating classification: photosensitizer

Core tip: Introduction: Photosensitizers, also known as photoinitiators or sensitizers, are a kind of compounds that can absorb certain wavelength of ultraviolet light and produce free radicals or ions Photosensitizer is an important component of radiation curing system, such as optical photoresist, photoresist, and light curing anaerobic adhesive It can be used to produce a fast curing and pollution-free green adhesive Conditions met: Choice: ① Efficiency of absorbing radiation The best photoinitiator should have a maximum extinction coefficient at a given light source wavelength In the system with pigment, the strong absorption wavelength of photosensitizer must be at the weak absorption wavelength of pigment In very Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Introduction: photosensitizer, also known as photoinitiator or sensitizer, is a kind of compound that can absorb certain wavelength of UV light and produce free radicals or ions Photosensitizer is an important component of radiation curing system, such as optical photoresist, photoresist, and light curing anaerobic adhesive It can be used to produce a fast curing and pollution-free green adhesive Meet the conditions: Select: ① the best photoinitiator with the best radiation absorption efficiency, under the given light source wavelength, its extinction coefficient should be the maximum value In the system with pigment, the strong absorption wavelength of photosensitizer must be at the weak absorption wavelength of pigment In many cases, mixing the two photoinitiators will have a better effect ② The effective conversion of the radiation energy of the ideal photoinitiator should not produce the side reactions of inactive radicals, but also avoid the components that may extinguish the photoinitiator ③ The diffusion ability of the active radicals is small, the radicals have high diffusion coefficient, but the large radicals are difficult to diffuse ④ The photoinitiator or synergist which is not sensitive to oxygen is used ⑤ Photoinduced cationic polymerization has the important advantages of industrial application, that is, they are not blocked by oxygen polymerization, and can be quickly completed in the air At present, the most industrial value is photoinduced cationic polymerization and copolymerization of epoxy resin The positive ion photoinitiators are diaryl iodonium salt, triaryl sulfonium salt, triaryl selenium salt, dialkylbenzoyl methylsulfonium salt and dialkyl hydroxyphenyl sulfonium salt, among which the most practical ones are diaryl iodonium salt (DPI) and triaryl sulfonium salt (TPS) Important photopolymerization system photosensitizers: coating house is specialized in coating, diatom mud, paint coating, coating process, news and coating of fireproof coating, diatom mud, paint coating, coating process, decoration knowledge and decoration effect map of fireproof coating,