Photostabilization of CMP Bleached Pulp by Various Inhibitors
Abstract
Photostabilization of Hardwood CMP pulp bleached with hydrogen peroxide in the presence of various additives including three ortho-hydroxy aromatic UV absorbers, hydroperoxide decomposer, hindered nitroxide and hindered phenolic antioxidant was studied. All treatments were applied as impregnation on the surface of CMP bleached testsheets. 2,4-dihydroxy benzophenone (DHB), Tinuvin 328 and Tinuvin 405 inhibited moderately light-induced yellowing of CMP bleached pulp. Hindered nitroxide (4-hydroxy TEMPO) and phenolic antioxidant (Irganox 1010) not only couldn’t stabilize CMP bleached pulp efficiently, but also intensified yellowing of the pulp. The hydroperoxide decomposer (Everfos 168) was also not found to be an effective inhibitor for CMP bleached pulp.
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