| Résumé : |
Regression data analysis was used to compare two alphahydroxy ketone, 1-hydroxycyclohexyl phenyl ketone (HCPK) and 2-hydroxy-2-methyl-1phenyl-propan-1-one (HMPP) and two phosphine oxide, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide (TPO) and bis (2,6-dimethoxybenzoyl)2,4,4-trimethyl pentyl phosphine oxide (DMBAPO) photoinitiators in a thin coating application. Phosphine oxide is inherently more efficient, especially in white pigmented systems than alpha hydroxy ketone because of its stronger and broader absorption at longer wavelength. Due to molecular weight dilution effect, it is usually required to have a higher TPO concentration in a formulation than HCPK or HMPP to overcome oxygen inhibition. On the molecular level, however, DMBAPO is the most reactive photoinitiator among all of them. Data analysis also suggests that the number of initiating free radicals generated by DMBAPO is twice of that generated by HCPK or HMPP or TPO. This study also confirms that in thin coating applications the use of either nitrogen blanket or photoinitiator blend is a good method for increasing productivity and reducing formulation cost. |
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Accueil
Comparative study of photoinitiator curing efficiency using regression data analysis in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 886 (11/1998)
