Application of Polyvinylpyrrolidone PVP in Textile Printing and Dyeing
Polyvinylpyrrolidone (PVP) has a lactam structure in its molecule, which has a strong binding force with hydroxyl, amino, and carboxyl groups, and dyes often contain these functional groups, so PVP has a strong affinity with general organic dyes, Sometimes this affinity even exceeds the binding force of dye and fiber, so PVP is called "liquid fiber". Using this property of PVP can increase the affinity between some hydrophobic fibers and dyes, thereby improving the dyeability of such fibers.
Industry application examples：
● Textile industry
Polyvinylpyrrolidone has a strong affinity with general organic dyes, especially with direct, reduced, and sulfurized dyes, which can improve the dyeability of many hydrophobic synthetic fibers.
● Printing and Dyeing Industry
Because polyvinylpyrrolidone has a strong binding ability with dyes, especially dyes such as reduction, vulcanization, direct and color development, it has been used as a stripping agent, bleaching agent, and color reducing agent very early, and it is constantly being used. Applications.
● Detergent Industry
In the textile printing and dyeing industry, after the fabric is printed, it must be washed (or soaped) for desizing. The purpose is to wash away the unfixed dyes and the used size and other printing and dyeing auxiliaries on the fabric to improve the colorfastness. The hand feeling is restored, and a strong printing material with bright and clear patterns is obtained. For this reason, a certain detergent should be used in the process of washing and desizing. Because PVP has excellent solubility and colloidal protection ability, it has a strong complexing ability with dyes. Under normal circumstances, this combination is irreversible. During the cleaning process, it may effectively prevent white staining.