Povidone K17/K25/K15/K30/K90/K60,N-Vinyl-2-Pyrrolidone,Povidone Iodine,Crospovidone

The lactam structure in PVP molecules has a strong binding force with hydroxyl, amino, carboxyl group. And dyes often contain these functional groups,so polyvinylpyrrolidone and the general organic dyes have a strong affinity. Sometimes this affinity even exceeds the dye and fiber binding force. That’s why polyvinylpyrrolidone also known as the LIQUID FIBER. During the process of synthetic fiber, add appropriate amount of povidone, the synthetic fibers can be evenly stained, as well as improving the coloring and dyeing depth. PVP chemicals can not only improve the dye ability of some fibers, but also its hygroscopicity, sunscreen and other properties, which can be quite effective for getting good quality and grade of synthetic fibers.

Before spinning, add 4% to 8% PVP to the molten polyamide, and then melt spinning in a low oxygen environment. The PVP  K value is between 30~70.and the residual monomer content requires less than 0.1%.If the K value is less than 30,since the low molecular weight PVP and polyamide complex ability is poor, there will be some PVP dissolved in water in the water treatment process and can’t obtaining a high hygroscopic fiber finally. On the other hand, if the molecular weight for PVP over 70, molten melt viscosity increases, will cause spinning difficulties, and affecting production efficiency. Larger for PVP molecular weight, harder the fiber will be. Then the synthetic fiber product will not reach the requirements of soft and comfortable standard. PVP-K60 can help improve polyester fiber moisture absorption to the highest rate. Up to 20% of the weight of the fiber itself. The influence as below:

In the printing and dyeing industry, polyvinylpyrrolidone widely used as a local anti-dye agent and net lotion.The research data shows, PVP and sodium aluminosilicate as the main component of the printing and dyeing industry net lotion,the washing ability is much better than the one without these two chemicals.Additional they  can prevent the transfer of color during the net wash or white stains.But since the viscosity for PVP K60 is between PVP-K30 and PVP-K90,while PVP K30 price is lower than PVP K60.Many of customers choose PVP-K30 polyvinylpyrrollidone.