| abstract |
The invention provides a fluorene photoinitiator, a preparation method thereof, a photocuring composition containing the fluorene photoinitiator and application of the fluorene photoinitiator in the field of photocuring. The fluorene photoinitiator has a structure shown as a formula (I), wherein R 3 Selected from photoactive groups. Introducing a benzophenone alkyl substituent group on the position of the No. 9 carbon atom of the fluorene structure, wherein fragments formed by the initiator still have higher stability and photocuring effect after initiation reaction; simultaneous photoactive radicals R 3 The introduction of the photoinitiator can improve the absorption efficiency of the photoinitiator to light, and is further beneficial to improving the sensitivity of the photoinitiator. In addition, the photoinitiator has the characteristics of difficult migration and excellent yellowing resistance because of large weight and light color, and therefore, the photoinitiator also has the advantages of almost no VOC discharge, low odor and excellent yellowing resistance. |