Characteristics and principle of photoinitiator TPO

What are the characteristics of the photoinitiator TPO? The ideal photoinitiator TPO should have the following advantages:

(1) Cheap, simple synthesis.

(2) The photoinitiator and its photolysis products should be non-toxic.

(3) Good stability, easy for long-term storage.

(4) The absorption spectrum of the photoinitiator should be consistent with the emission spectrum of the emitted light.

(5) Most photoinitiator molecules jump to singlet state after absorbing light. Jump to the triplet state of interline stimulation, so the interline jump efficiency of the agent needs to be improved.

(6) High start-up efficiency.

Our chemical raw materials products span photoinitiators, photninitiators, water treatment agents, pharmaceutical intermediates,pesticide intermediates and so on.

What is the principle of photoinitiator TPO?

The photoinitiator TPO molecule stimulates the ultraviolet (250~400 nm) or visible (400~800 nm singlet or triplet) region and undergoes single or bimolecular chemical interactions to produce active fragments that can initiate monomer polymerization. These active fragments can be cations, anions, etc. According to the mechanism of occurrence. Photoinitiator TPO can be divided into polymeric photoinitiator and cationic photoinitiator, which is widely used as a free radical polymerization photoinitiator.

1, free radical - cation mixed photoinitiator

The free radical system has high curing speed, but large shrinkage. Cationic light curing has small size, strong adhesion, the process is not blocked by oxygen, and the reaction is not easy to end. Strong "post-curing" ability. It is suitable for curing after film light, but the solidification speed is slow. By combining the advantages of the two, the hybrid system of the free machine and the yangson photoinitiator TPO can be combined together. The free machine aggregators can carry out ion aggregation, so as to play the advantages, avoid the disadvantages, and produce synergistic effect. More satisfactory results can be obtained when two or more photoinitiators are used together.

2, visible light initiator

Irgacure 784 and Titamao have good optical priming, storage stability and low toxicity. The absorption wavelength is extended to 500nm, and the absorption is larger in the visible region. The light used in acrylates is particularly effective at initiating polymerization hardening. In addition, the photobleaching effect of titanium causes the film to turn yellow. The exponent goes down. Moreover, the deep hardening is good, which is conducive to the complete hardening of thick film.