Although some dyes can produce bright colors, the water-soluble groups carried by the dyes make the wet processing fastness poor, causing fading phenomenon. It not only makes the appearance of the textile look old, but also the dye falling off will stain white or other colored fibers, causing color staining. In addition, although reactive dyes can form covalent bonds with cellulose fibers, if there are hydrolyzed dyes or insufficiently washed unfixed dyes during dyeing, the wet processing fastness will also decrease.
The fixing mechanism of color fixing agent that can improve wet processing fastness generally has the following functions
A precipitate insoluble in water is generated on the fabric, sealing the soluble groups, so that the dye on the fabric is not easily dissolved and falls off when encountering water, thus improving the wet processing fastness. However, these fixing agents may cause a change in the color and cause a decrease in sunfastness after fixing.
A mesh film is formed on the fabric to prevent dyeing from falling off.
Using the reactive groups in the molecules of the color fixing agent to crosslink with the reactive groups of the dye molecules and the hydroxyl groups in the cellulose molecules to improve the fixing effect of the dye on the fiber.
Using the molecular attraction between the fixing agent and the fiber to increase the fixing strength of the fixing agent, thereby improving the color fastness.
Methods for improving other color fastness with color fixing agent
Using the smoothing agent in the color fixing agent to reduce the friction coefficient on the fiber surface, thereby improving the rubbing fastness of dyed fabrics.
Introducing a UV absorber into the color fixing agent molecule, using the UV absorption group to absorb UV rays in sunlight to prevent UV rays from damaging the dyeing structure and improving sunfastness.
Using the chlorine resistance or itch resistance of some substances to prevent the attack of active chlorine on the diazo structure of reactive dyes, thereby improving the chlorine resistance and bleach resistance of reactive dyes.
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HT's main products include formaldehyde-free fixing agents, acidic fixing agents, composite refining enzymes, chelating agents (CT powder), heat sublimation fastness improvers, wet rubbing fastness improvers, soap agents, cold organic silicon softeners, ternary organic silicon softeners, bright lubricants, softeners, etc. Welcome to inquire.