Study on silk fabrics modified with reactive deep eutectic solvents and their dyeing properties
Dyeing wastewater pollution is one of the important bottlenecks that restrict the sustainable development of the textile industry.Promoting the development of green solvents and achieving efficient modification are an important pathway for the green transformation of the textile industry.Deep eutectic solvents(DES)have low cost,easy preparation,and good biodegradability,making them promising in extraction and catalysis fields,but there is limited attention to the functional application of DES components.In this study,a low eutectic solvent composed of betaine(Bet)and lactic acid(LA)was used as both the reaction solvent and reactant for the modification of silk fabrics.The effects of traditional heating and microwave heating on the reaction efficiency were compared,and the morphology,structure,and dyeing properties of the obtained samples were analyzed.The results showed that microwave heating significantly improved the reaction efficiency,and the modified fabric obtained in 15 seconds exhibited characteristic peaks of C=O and CH3—N+groups at 1,733 cm-1 and 1,475 cm-1 in the ATR-FTIR spectrum,as well as a new-CONH-peak at 1,650 cm-1.The XPS wide scan spectrum showed a shift and increased area of the C—N peak,as well as the appearance of the CH3—N+group signal peak,confirming the successful introduction of betaine from the DES into the silk fabric.The modified fabric showed a slight increase in surface roughness,an increase in crystallinity from 71.57％to 78.57％,and a 2.8％improvement in tensile strength.The surface charge of the fabric increased from-26.35 mV to 5.57 mV,resulting in a 58-fold increase in dye uptake on the fabric,with the dyeing K/S value increasing from 0.075 to 4.071.The optimal dyeing process was determined as follows:Na2 CO3 concentration of 2 g/L,dyeing temperature of 50℃,and dyeing time of 80 minutes.Furthermore,the study demonstrated that the breathability of the modified fabric remained relatively unchanged,while the moisture absorption increased from 268.37％to 335.12％.This study provides a new scientific basis for the modification of silk fabrics and the multifunctional application of low eutectic solvent components.
silk fabricdeep eutectic solventmicrowave heatingquaternary ammonium salt modificationdyeing performance
万方数据
维普
