| 摘要 |
<p>A deinking agent comprising a compound represented by the following general formula I is herein provided: R1O -(PO)m -(EO)n - (XO)k - R2 (I) (wherein R1 represents an alkyl or alkenyl group having 12 to 22 carbon atoms; R2 represents a hydrogen atom or an acyl group having 2 to 24 carbon atoms; PO, EO and XO represent a propylene oxide unit, an ethylene oxide unit and an alkylene oxide unit having not less than 3 cabon atoms, respectively; m = 1~8; n = ~40; and k is such a number that the number of total carbon atoms present in the polymerized XO unit ranges from 3 to 120; the PO and EO in Formula (I) being added through block-addition) ~ The use of the deinking agent in the deinking methods, in particular, the flotation method permits the preparation of high quality reclaimed pulp having high brightness and a low content of residual ink and also ensures stable operations for the methods.</p> |
