Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather
Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather
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DOI：
10.1111/cote.12692
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Shufen Zhang
中科院分区：
文献类型：
--
作者：
Dexiang Li;Wei Ma;Bingtao Tang;Shufen Zhang
Ultrafine polyamide/polyurethane synthetic leather (UP/PSL), with a highly.natural leather-like appearance and touch, is widely used in many leather.commodities. Generally, acid dyes, which are mostly used for dyeing UP/PSL,.exhibit poor colour fastness. While, reactive dyes are well-known for their.good colour fastness. However, reactive dyes are not used to dye UP/PSL.because they are water-soluble and cannot stain the polyurethane (PU) in.UP/PSL. In this study, five low water-soluble reactive dyes with good affinity.for both polyamide (PA) and PU were synthesised and characterised using.ultraviolet-visible and infrared spectroscopy, and mass spectrometry. All lowwater-.soluble reactive dyes were monoazo dyes with only one sulfonic group.and two different functional groups. The reactive dyes were used to dye.UP/PSL at 98C and fixed at 90C with 7-azatridecane-1,13-diamine as a crosslinking.agent. For comparison, Eriofast Red-2B (ER-2B) was used to dye.UP/PSL using a special dyeing procedure. ER-2B showed severe issues related.to low utilisation and uneven dyeing, whereas the five low water-soluble reactive.dyes exhibited better performance than ER-2B. Both the exhaustion and.fixation of dyes 1 and 4 exceeded 90.0% when the dosage was less than 3.0%.owf (on weight of fabric). In addition, they exhibited good levelling. The washing.fastness of the five reactive dyes was excellent and higher than grade.4. The dry rubbing fastness was higher than grade 3-4. Therefore, UP/PSL can.be satisfactorily dyed using the reactive dyes with a solubility of less than.1.0 g/L and meet the requirements of daily life applications.
