| 摘要 |
<p>Describes flotation deinking of secondary fiber using a froth moderating agent, a composition of the froth moderating agent with flotation deinking chemicals, and reducing the amount of stickies in separated secondary fiber. The froth moderating agent is selected from the group consisting of: (a) nonionic surfactant material represented by the formula: R-C6H4O-(C2H4O)m- (C3H6O)n-(C4H8O)p-R1, wherein R is an aliphatic hydrocarbon group containing from about 5 to 20 carbon atoms, R1 is selected from the group consisting of chloro, C1-C3 alkyl, C1-C5 alkoxy and phenoxy, m, n, and p are each a number of between 0 and about 50, and the sum of m, n, and p is between about 1 and 50; (b) fatty acid esters of sorbitan; (c) certain alkoxylated fatty acid esters of sorbitan; (d) polypropylene glycol being at least 50 weight percent soluble in water; and (e) a combination of at least two of the materials selected from the group consisting of (a), (b), (c) and (d). Also described is the use of a froth controlling amount of nonionic surfactant material (a) alone or in combination with flotation deinking chemicals or other froth moderating agents in reducing the amount of stickies and enhancing the removal of electrostatic inks in the flotation deinking process.</p> |
