松式碱处理对竹纤维直接染料染色性能的影响

采用不同浓度的烧碱溶液对天然竹纤维进行松弛处理，然后采用直接染料染色，讨论了烧碱处理对竹纤维染色性能的影响及原因。研究结果表明，在115～130g／L碱浓范围内，直接染料上染量增加的幅度最大；当碱浓高于160g／L后，上染量几乎不再增加。与棉纤维相比较，直接染料对竹纤维的平衡上染百分率低、染深性差、上染速度慢，采用190g／L以上浓度的烧碱处理，可使直接染料对竹纤维的平衡上染百分率、染深性和染色速度达到与碱处理棉纤维相同的水平。

Influence of slack caustic treatment on direct dyeing behaviours of natural bamboo fibers

Natural bamboo fibers were alkalized by caustic soda in slack state, and then subjected to direct dyeing. The influences of caustic treatment on the dyeing behaviours of bamboo fibers were investigated and the reasons for the change in their dyeability were discussed. The maximum increase in the uptake of direct dyes occurs for the bamboo fibers alkalized with the caustic soda solutions of the concentrations ranging between 115 g/L and 130 g/L, while the uptake almost keeps constant after the concentration of caustic soda solution is above 160g/L. The equilibrium exhaustion, substantivity, dyeability and building up properties of bamboo fibers are poorer than those of cotton fibers. These dyeing behaviours of bamboo fibers can be greatly increased to the comparable extents with those of cotton fibers if they are alkalized with the caustic soda solution of the concentration exceeding 190 g/L.