HT Fine Textile Chemical Auxiliary Agent

Color fastness, also known as color fastness or dyeing fastness, refers to the degree of fade of the dyeing fabric under the effect of external factors (such extrusion, friction, washing, rain, exposure, light, Saliva dripping, water stains, perspiration, etc.) in the use or processing process. Color fastness is a very important reference indicator for dye products. If color fastness is good, the textile is not easy to fade in the post-processing or use process; if color fastness is poor, textile will fade seriously, colored slightly, or stain, which will affect the appearance and cause a lot of inconveniences. The common questions of about color fastness   1. Color fastness to sunlight The parts of clothing like coat under sunlight will fade or discolor (usually the back and shoulder parts) while other parts don not, resulting in different parts of the product looks different so that the product cannot be used. 2. Color fastness to water cleaning, soaping, and dry cleaning...

I.  The choose of dye There is a great variety of reactive dye with different quality level. So the choose of qualified dye becomes important. 1. The choose of  bi-functional   reactive dyes  and multi-functional reactive dyes. S-triazine reactive dye react with fiber and produce ester bond, whose acid-resisting ability is bad. Vinyl sulfones dye react with fiber and produce ether bond, whose alkalic performance is bad. So we choose bi=functional reactive dyes, whose acid-resistance and alkali-resistance ability is good. 2. Choose the dye with proper substantivity If the substantivity of reactive dye is too high, it diffusion ability is bad. The dye will gather on the fabric surface and not extend to the inner of the fiber. The unfixed dye is more than expected, and difficult to wash. If the substantivity is too low, if will influence the degree of fixation. So the substantivity should be medium. And we can refer to the manufactures data to choose. 3. Choose...