| 摘要 |
A method of deinking printed paper comprises pulping the paper to form an aqueous slurry, adding a deinking additive to the paper, and removing detached ink by flotation, wherein the additive comprises an organo-modified siloxane comprising units of the formula: [R<SUP>1</SUP><SUB>a</SUB>Z<SUB>b</SUB>SiO<SUB>(4-a-b)/2</SUB>]<SUB>n </SUB>in which each R<SUP>1 </SUP>is independently selected from a hydrogen atom, an alkyl, aryl, alkenyl, aralkyl, alkaryl, alkoxy, alkanoyloxy, hydroxyl, ester or ether group; each Z is independently selected from an alkyl group substituted with an amine, amide, carboxyl, ester, or epoxy group, or a group -R<SUP>2</SUP>-(OC<SUB>P</SUB>H<SUB>2P</SUB>)<SUB>q </SUB>(OC<SUB>r</SUB>H<SUB>2r</SUB>)<SUB>s</SUB>-R<SUP>3</SUP>; n is an integer greater than 1; a and b are independently 0, 1, 2 or 3; R<SUP>2 </SUP>is an alkylene group or a direct bond; R<SUP>3 </SUP>is a group as defined for R<SUP>1 </SUP>or Z above; p and r are independently an integer from 1 to 6; q and s are independently 0 or an integer such that 1<=q+s>=400; and wherein each molecule of the organo-modified siloxane contains at least one group Z. |
