Indigo denim wet rubbing fastness enhancement process and mechanism
As one of the most important and popular fabrics in the textile industry,denim is considered to be the most widely used fabric in the fashion industry;it is popular because of its high strength,distinct texture,moisture absorption and breathability,and beauty and comfort.In recent years,with the development of the textile industry and the improvement of textile technology,the competitiveness of denim apparel has been rising.It is predicted that the market value of denim fabrics worldwide will reach RMB 620 billion in 2025,which is a very broad market prospect.Indigo dyeing has disadvantages such as high initial dyeing rate and poor dye penetration,which leads to very poor wet rubbing fastness of indigo dyed denim fabrics,generally only level 1.This affects the quality of denim fabrics and seriously restricts the development of the industry.Therefore,the low wet rubbing fastness and poor quality of indigo denim have become a common problem in the industry,so it is of great significance to improve the quality of denim and the wet rubbing fastness of indigo denim.In this paper,we aimed to enhance the permeability of indigo dyes and improve the wet rubbing fastness of denim by strengthening the pretreatment process and regulating the state of indigo leuco.Based on this,we further explored the mechanisms and processes related to the influence of different fixing agent types and their molecular weights on enhancing the wet rubbing fastness.The experimental results show that the wet rubbing fastness of indigo-dyed denim can be enhanced to grade 3 by selecting polyurethane color fixing agent B with relatively large molecular weight and optimizing the pretreatment and dyeing process parameters.The optimized pretreatment process requires refining agent A of 10 g/L and caustic soda of 20 g/L at 95℃ for 30 min;the dyeing process requires an insurance powder of 18 g/L,urea sulfur dioxide of 1 g/L,caustic soda of 10 g/L,penetrant WET of 6 g/L;color fixing process requires color fixing agent B of 60 g/L at 160℃ for a baking time of 120 s.
indigo denimdyeing K/S valuefastness to wet rubbingpolyurethane color fixing agent
万方数据
维普
