Salt free dyeing properties of cotton fabrics grafted with ε-polylysine(ε-PL)

ABSTRACT

Cotton fabric was chemically modified with ε-Poly-L-lysine (ε-PL), which contains abundant imino groups and primary amino groups. ε-PL was grafted onto cotton fabric by a reaction between aldehyde groups of oxidized cellulose and amino groups of ε-PL. FT-IR of grafted cotton fabrics was researched and it demonstrated the covalent bonds combination between ε-PL and cellulose fibers. Zeta potential of cotton fabrics grafted with ε-PL was positive when pH was lower than 7.5. Dyeing properties of modified cotton fabrics were investigated. Exhaustion rate and fixation rate of reactive dyes on modified cotton fabrics with a salt-free dyeing process were higher than those of unmodified cotton fabrics with a conventional dyeing process. Compared with that of the unmodified cotton fabrics, the washing fastness, rubbing fastness, and leveling properties of the modified cotton fabrics were also good. The dyeing behavior of Procion Red H-E3B on modified cotton fabric was examined and found to follow a Langmuir-type adsorption curve. It is concluded that ε-PL could be used as a salt-free auxiliary in reactive dyeing on cotton fabrics.

摘要

用含有丰富亚氨基和伯氨基的ε-聚赖氨酸 (ε-PL) 对棉织物进行化学改性. 通过氧化纤维素的醛基与ε-PL的氨基反应, 将ε-PL接枝到棉织物上. 对接枝棉织物的红外光谱进行了研究, 证实了ε-PL与纤维素纤维之间存在共价键结合. 当pH值低于7.5时, ε-PL接枝棉织物的Zeta电位为正. 研究了改性棉织物的染色性能. 活性染料对改性棉织物无盐染色的上染率和固色率均高于未改性棉织物常规染色的上染率和固色率. 与未改性棉织物相比, 改性棉织物的洗涤牢度, 摩擦牢度和匀染性能均较好. 研究了改性棉织物对Procion红H-E3B的染色性能, 发现其染色性能符合Langmuir型吸附曲线. 结果表明, ε-PL可作为棉织物活性染料染色的无盐助剂.

KEYWORDS:

• Cotton fabrics
• dyeing properties
• modification
• ε-Poly-L-lysine
• reactive dyes
• salt-free dyeing

关键 字:

• 关键词: 棉织物
• 染色性能
• 修改
• ε-聚赖L-氨酸
• 活性染料
• 无盐染色