Due to the deteriorating global environment in which human beings are living, countries around the world have taken environmental protection to an extremely important position, and the printing and dyeing and post-treatment of various textile materials is a great source of pollution. Therefore, the coloring of the melt in the fiber is The trend of spinning, first, the use of cationic raw materials, and dyes due to the action of ions to make dyeing easier, reduce pollution, the second is to directly add a variety of masterbatch, so that the fiber is processed to color, reduce the dyeing process, color fast It is also highly used and is widely used in various fabrics.