紫外线辐照棉织物接枝壳聚糖改性及其性能分析

Grafting chitosan onto cotton fabric by UV-irradiation and analysis of its performance

以柠檬酸(CA)为交联剂,以磷酸二氢钠为催化剂,对紫外线辐照棉织物接枝壳聚糖(CS)。研究了柠檬酸的质量浓度和水浴处理时间对壳聚糖接枝率的影响,得出最佳处理条件:15 g/L CS,100 g/L CA,20 g/L磷酸二氢钠,70℃水浴下煮60 min,然后130℃干燥5 min,室温真空干燥24 h,壳聚糖接枝率为2.69%。对比了改性前后棉织物的染色性能、透湿透气性、折皱弹性和柔软性。结果表明:改性后棉织物的染料上染率为93.5%,较未处理的棉织物提高了20%,染色深度K/S值也提高了24%,而染色牢度没有改善;改性棉织物的透湿性能提高14%,但透气性能下降15%;改性棉织物的折皱弹性均有提高,其中急弹性回复角提高26.3%,缓弹性回复角提高14.7%;改性棉织物的柔软性略有下降。总体来说,接枝壳聚糖改性棉织物的整体性能有所提高。

Grafting chitosan（CS） onto cotton fabric by UV-irradiation was performed using citric acid（CA） as cross-linking agent and sodium dihydrogen phosphate as catalyst.The effect of concentration of CA and bathing time on the grafting percentage of CS was investigated.The optimum conditions were determined as follows： CS 15 g /L,CA 100 g /L,sodium dihydrogen phosphate 20 g /L,bathing for 60 min at 70 ℃,then curing at 130 ℃ for 5 min,and then vacuum drying at room temperature for 24 h.The grafting percentage of CS was 2.69%.The dyeing property,air and moisture permeability,crease recovery and softness of the treated and untreated cotton fabrics were discussed.The results showed that in comparison with the untreated fabric,the dye uptake rate of the treated fabric increased to 93.5%（20% higher than that of the untreated one）.The K/S value increased by 24% but color fastness remained the same.The moisture permeability increased by 14% but air permeability decreased by 15%.The crease recovery enhanced,therein the acute crease recovery increased by 26.3% and the slow one by 14.7%.The softness declined a little.In general,the overall performance of the chitosan modified cotton fabric has been enhanced.