Light curing material compositionread count [1291] release time：2021-12-17 17:02:00

Photocuring reaction systems usually consist of monomers, oligomers and initiators.

1.monomer

Monomers are also called reactive diluents. They have low viscosity and are similar to solvents. They can dilute and dissolve low polymers and photoinitiators. However, unlike solvents, their chemical structures contain active functional groups that can undergo photocuring reactions.

2.oligomer

Oligomers are photosensitive resins with relatively small molecular weights ranging from hundreds to thousands to tens of thousands. They also contain the same reactive functional groups as monomers and can participate in photocuring reactions. Because oligomers have a certain molecular weight, their viscosity is often large, and the material properties after curing are usually provided by them. There are two main categories of oligomers, namely acrylate resin and epoxy resin.

If there are only monomers and oligomers in the system, they are generally very stable and difficult to carry out photocuring reactions (except for electron beam curing). Photocuring reactions also require the initiation of photoinitiators.

3.photoinitiator

Photoinitiators are light-sensitive chemicals that can produce active species, such as free radicals or cationic active species, after receiving appropriate light, initiating the curing of monomers and oligomers. Usually, under light-proof conditions, the liquid photosensitive resin system is very stable and can be stored stably for half a year to a year or even longer, but a rapid curing reaction will occur once it is exposed to light. Since the average functionality of liquid photosensitive resin systems is usually greater than 1, so a cross-linked polymer network system is formed after curing, and the liquid photosensitive resin becomes a solid cross-linked polymer network.