Polyvinyl pyrrolidone(PVP), Dye-affinitive stripping and leveling agent, Washing-off agent for textile printing
RTPVP is colorless liquid-yellowish. It is nonionic and its solubility does not change with the presence of acids, bases and salts in the water. In addition, the use of common agents and detergents does not have any effect on its performance.
• As a stripper for dyeing with straight, vat, sulfur and reactive dyes
• In order to clarify the degree of dyeing and printing with direct dyes
• Enhancement of synthetic fiber dye ability
• Avoid creating a stain in the washing stage with direct and reactive dyes
• As a monolithic cellulose cloth in direct and vat dyes
The function of this product is based on the inherent desire of PVP to absorb anionic dyes.
Poly vinyl pyrrolidone, due to its chemical structure (the presence of a lactam ring), can form a complex with many molecules containing functional groups such as hydroxyl, carboxylic and amine.
Since, under certain conditions, the strength of the complex formed is greater than the bond strength of color and fiber molecules; PVP is referred to as "liquid fiber".
This PVP feature can enhance the hydrophobic synthetic fiber viscosity. So that by adding 5-10% PVP to the polyurethane nitrile spinning solution, the viscosity of the produced polyacryl-nitrile fibers increases considerably.
PVP applies a strong reatarding effect on cotton fabrics. In fact, PVP forms the complex with direct dyes and prevents the accumulation of dye molecules on the fabric surface. For example, adding 1% by weight of PVP to nylon 6 and nylon 66 with acidic paint or metal-colored paint can have the best effect. In addition to cationic paint polyester fabrics, the addition of 2% by weight of PVP not only improves the dye and brilliance of fabrics, but also improves the resistance of sunlight fastness from 2 to 8, and provides anti-static properties increases. Polypropylene and cellulose combined fabrics with PVP presence as a monolithic make the texture color and luster evenness and acceptable dye fastness.
Typically, in the finishing process, since cationic auxiliary materials and anionic fluorescent dispersions are incompatible, they cannot be used simultaneously. In this case, if about 1-2% PVP is added to the bath, it can process the fabric with the simultaneous presence of softener or antistatic, fluorescent bleach and resin finisher.
This product is similar to the German company BASF named Albigen A.