What are photoinitiators and how much do people know about photoinitiators? Photoinitiators are a type of compound that can absorb energy at a certain wavelength in the ultraviolet (250-420nm) or visible (400-800nm) region, generate free radicals, cations, etc., and thus initiate monomer polymerization, crosslinking, and curing. However, the wavelengths absorbed by different photoinitiators are different.

The classification of photoinitiators can be mainly divided into two categories: free radicals and ionic types. Free radicals can be divided into Type I and Type II; Ionic types can be divided into cationic and anionic types. The photoinitiator is the starting point of the formulation, and its final use is influenced by performance requirements and the formulation system. There is only the most suitable photoinitiator, there is no best photoinitiator.

Photoinitiators are located upstream in the industrial chain. The raw materials in the UV curing industry chain are mainly basic chemical materials and specialized chemicals, with photoinitiators located upstream of the industry chain. The series of thiol compounds can be used as raw materials for photoinitiators, and are mainly used in the fields of medicine and pesticide manufacturing; Photoinitiators are applied in various fields such as photoresists and supporting chemicals, UV coatings, UV inks, etc., with terminal applications spanning electronic products, home decoration and building materials, medicine and medical treatment, etc.

There are various types of photoinitiators with a wide range of uses, so how should we choose them? Next, let me tell them how to choose several commonly encountered products.

Firstly, I would like to introduce photoinitiator 819, which can be used for colored UV cured plastic coatings. UV coatings, due to their excellent performance and efficient production, have been widely used on plastic shells of various electronic and household appliances products. However, the deep solidification of UV coatings after coloring is not good, resulting in poor film adhesion and poor dispersion and arrangement of pigments by UV resins, seriously affecting the appearance of the coatings, Therefore, the traditional construction process is to first apply solvent based colored primer for coloring, then apply UV varnish after baking to improve the various physical properties of the paint film surface.

Photoinitiator 184 is an efficient and yellowing resistant free radical (I) type solid photoinitiator with the advantages of long storage time, high initiation efficiency, and wide UV absorption range. It is mainly used for UV curing of unsaturated prepolymers (such as acrylic esters) together with single or multi functional vinyl monomers and oligomers, and is particularly suitable for coatings and inks that require high yellowing degree.

Photoinitiator TPO-L is a kind of liquid photoinitiator, which is used in the formulation system with low yellowness and low odor. It is commonly used in silk screen printing ink, Planographic printing printing ink, flexographic printing ink, photoresist, varnish, printing plate and other fields.

The photoinitiator TPO is mostly used in white systems, and can be used in UV curing coatings, printing inks, UV curing adhesives, Optical fiber coatings, photoresists, photopolymerization plates, stereolithographic resins, composites, tooth filleras, etc.

Photoinitiator 2959 is an efficient non yellowing photoinitiator with high activity, low odor, non yellowing, low volatility, insensitivity to oxygen polymerization, and high surface curing efficiency. Unique hydroxyl groups that are easily soluble in water-based coatings. Especially suitable for water-based acrylic esters and unsaturated polyesters. Photoinitiator 2959 is also an adhesive approved by the FDA certification system for non direct contact with food.

Benzophenone is a free radical photoinitiator mainly used in free radical UV curing systems such as coatings, inks, adhesives, etc. It is also an intermediate in organic pigments, pharmaceuticals, spices, and insecticides. This product is also a styrene polymerization inhibitor and fragrance fixative, which can give fragrance a sweet flavor, and is widely used in perfume and soap essence.

Products similar to photoinitiators are ultraviolet absorbers. Sometimes, people often cannot distinguish between the two. UV absorbers can replace photoinitiators. Because UV absorbers are the most widely used type of light stabilizer and can be compatible with or replace photoinitiators for use, and their effectiveness is also very good. Photoinitiators are specifically used for photocuring, for inks, coatings, and can also be used in industrial and electronic fields. UV absorbers have a relatively large range of uses, mainly used in cosmetics with high quality requirements. Meanwhile, the price of ultraviolet absorbers is relatively high, while photoinitiators are relatively low. People can choose corresponding products based on their own needs.

Unilong Industry Co., Ltd. is a professional initiator manufacturer. In addition to the products mentioned above,  also have the following similar products:

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