PVP K30  is known as one of the important excipients advocated internationally. It is also the most widely used K-value in Polyvinylpyrrolidone K-series products.

Polyvinylpyrrolidone, short for PVP with CAS 9003-39-8, is a white to milky white powder. Easily soluble in water, alcohol, amines and halogenated hydrocarbons, but insoluble in acetone, ether, etc. It has excellent solubility, biocompatibility, physiological inertness, film-forming properties, film protection ability and the ability to combine various organic and inorganic compounds, and is relatively stable to acids, salts and heat.

PVP K30 is widely used in the market due to its excellent characteristics. Like industry, pharma, cosmetic, battery, etc. Here we focus on its application for textile.

PVP K30  provides hydrophilic and lipophilic chemical properties and has found application as an excipient in some conventional, controlled and novel drug delivery systems due to its solubility, in various grades The availability provides functions such as film formation, complexation, solubilization, adhesion, stabilization, suspension, thickening and others. There is a lactam structure in the PVP K30 molecule, which has a strong binding force with hydroxyl, amino, and carboxyl groups. Dyes often contain these functional groups, so PVP has a strong affinity with general organic dyes. , sometimes this affinity even exceeds the binding force between dye and fiber. This property of PVP can be used to increase the affinity between some hydrophobic fibers and dyes, thereby improving the dyeability of such fibers.

‌The main applications of PVP K30 in textiles are as leveling agents, dye resists and cleaning agents. PVP K30 can increase the affinity between hydrophobic fibers and dyes, thereby improving the dyeability of the fibers and improving the adhesion of dyes on fabrics, resulting in textile dyes with uniform color, light and heat resistance and not easy to fade.

PVP K30 has a strong affinity with general organic dyes, especially with direct, reduced, and sulfurized dyes, and can improve the dyeability of many hydrophobic synthetic fibers. In the textile printing and dyeing industry, PVP K30 can increase the affinity between hydrophobic fibers and dyes, thereby improving the dyeability of the fibers; PVP K30 can also improve the hygroscopicity and sun protection properties of the fibers, and also utilize the differences in the binding ability of PVP K30 with different dyes. , can be used as a topical anti-stain agent and cleaning agent. In polymerization reactions, especially during emulsion polymerization or suspension polymerization, adding a small amount of PVP K30 can stabilize dispersion, thicken, control particle size, and improve certain properties of the polymer.

In the process of blending PVP K30, it is evenly distributed in the fiber, which can greatly reduce the color difference of the dyed fabric and improve the adhesion of the dye on the fabric. It can obtain textile dyeing products with uniform color, light and heat resistance and not easy to fade, which can play the role of leveling dyeing. The binding ability of PVP K30 to different dyes is sometimes different. By taking advantage of this property, when resist-dye printing polyamide fiber and polypropylene fiber, PVP K30 can be used as a local resist-dye to obtain printed fabrics with distinctive patterns and clear outlines. It plays an anti-fouling role. In the production process of printed fabrics, after printing, the fabric must be washed and desized to wash away the unfixed dye, used slurry and other printing and dyeing auxiliaries to obtain printed fabric products. In order to achieve the purpose of desizing It does not stain the pattern and ensures the quality of the product.

In detail, the application of PVP K30 in textile can be summed up into three parts:

• PVP K30has a strong affinity with general organic dyes, especially with direct, reduced, and sulfurized dyes, and can improve the dyeability of many hydrophobic synthetic fibers.
• PVP K30has strong binding ability with dyes, especially reducing, sulfurized, direct and developed dyes, and can be used as stripping agent, bleaching agent and color reducing agent.
• PVPK30 can be used as a cleaning agent during washing and desizing. It has excellent solubility and colloidal protection capabilities, and has strong complexing ability with dyes. During the cleaning process, it may effectively prevent white ground stains.

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