What is the selection principle of photoinitiator TPO?

The mineralogical and chemical properties of the photoinitiator TPO are very important to control the photoinitiation and photopolymerization process, which have the following properties: high extinction coefficient in the ultraviolet and near-ultraviolet region, and high free radical/ionon yield. Non-toxic, tasteless, no yellow degeneration, no volatile; Good mixing with resin, low migration, good storage stability, reasonable price.

According to the photolysis mechanism, photoinitiators TPO can be divided into two categories: free radical polymerization photoinitiators and cationic polymerization photoinitiators. Free malformed photoinitiators can be divided into split photoinitiators and hydrogen photoinitiators according to the mechanism of free radical generation.

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What is the selection principle of photoinitiator TPO? Let's take a brief look at it.

The photoinitiator with appropriate activity was selected according to the type of prepolymer and monomer. Good solubility and reactivity, less usage, high efficiency. To have a certain thermal stability, 85 below the decomposition, long-term storage stability. A combination of photoinitiators is preferable. Curing may be initiated at different wavelength ranges, so the curing speed is faster than that of a single photoinitiator. The photoinitiator was used with the amine promoter EDAB. Small smell, non-toxic, no environmental pollution. Cheap and easy to get, low cost.

Light curing system including UVG, UV coating, UV ink, etc., accept or absorb external energy, itself will undergo chemical changes, decomposition into free radicals or cations, causing polymerization reaction. All the substances that produce free radicals by light and cause further convergence are collectively called photoinitiators. Some monomers absorb photons after passing through the light, forming an excited state M*:M hvM*. The stimulated active molecules generate free radicals by uniform splitting: M *R R R ', resulting in monomer polymerization, resulting in polymer. Radiation curing technology is a new energy-saving and environmental protection technology of ultraviolet (UV), electron beam (EB), infrared, visible light, laser, chemical fluorescence and other radiation curing. Photoinitiator is one of the important components of photocuring adhesives and plays a decisive role in curing rate. The photoinitiator absorbs light energy after ultraviolet irradiation, splits into two active free radicals, produces the linkage polymerization of photosensitive resin and active diluent, makes the adhesive bond and cure, which is characterized by fast, environmental protection and energy saving.