Method for coloring cellulose

A method for coloring of cellulose in a supercritical CO 2 medium by an uncharged hydrophobic dye， including at least the steps including of: (i) provision of cellulose fibers， (ii) placing the cellulose fibers in the presence of: a) an effective quantity of at least one uncharged mono organo-urea primer of formula R—NH—CO—NH2， where R represents a linear or branched， saturated or unsaturated， hydrocarbon chain possessing at least 3 carbon atoms， or a saturated or unsaturated cyclic hydrocarbon radical， which is bonded directly or via a methylene or ethylene group to a nitrogen atom， and if appropriate substituted under conditions conducive to the forming of a covalent carbamatic bond between the cellulose and the molecules of the organo-urea; and b) at least one hydrophobic dye in a supercritical CO2 medium， under conditions conducive to the immobilization of the dye on the fibers.

一种在超临界二氧化碳（supercritical CO₂）介质中利用不带电荷的疏水染料对纤维素进行着色的方法，其至少包含以下步骤：
(i) 制备纤维素纤维；
(ii) 将纤维素纤维置于包含以下两种组分的体系中：
a) 有效量的至少一种通式为R—NH—CO—NH₂的单有机脲预处理剂（mono organo-urea primer），其中R代表具有至少3个碳原子的直链或支链、饱和或不饱和烃链，或是可通过亚甲基或亚乙基直接键合至氮原子上、且可根据实际需求进行取代的饱和或不饱和环烃基；该体系需满足利于纤维素与有机脲分子之间形成共价氨基甲酸酯键的反应条件；
b) 超临界二氧化碳介质中的至少一种疏水染料，该体系需满足利于染料固着于纤维表面的反应条件。