PVP has a good film-forming performance, soluble in water and insoluble in some organic solvents., Most of the material used for the pigment solvent is organic solvent.With the increase in molecular weight, the better film-forming ability it will be. PVP for surface treatment of organic pigments is generally PVP-K30, PVP-K90 or PVP VA64.
Available PVP surface treatment of the main pigments are: protective and decorative coatings, such as varnish, paint and etc. Aqueous dispersion system, printing, ink, fabric coloring and plastic color, latex and so on.PVP excellent dispersion properties can also be used for carbon black, phthalocyanine pigments, titanium dioxide and other pigment dispersion.
In the emulsion coating and the water-soluble resin coating, the coloring effect is lowered due to the poor dispersibility of the pigment and the aggregation and precipitation at the time of storage, an d lead to floating color and gloss difference phenomenon. Adding medium molecular weight PVP K30 can improve the color strength, eliminate the floating color, disperse and stabilize the pigment composition, improve the gloss, to avoid the flocculation of pigments. Styrene, methacrylate as the main body of the emulsion coating viscosity is often very low, resulting in poor water resistance coating, smearing too much fluid, the film thickness is not easy to control, and hardness is not enough, will fall off, so need to thicken, Adhesion treatment. By adding the right amount of PVP into this type of emulsion, after evaporation and concentration can increase its viscosity more than 10 times, get a high viscosity of the stable synthetic resin solution. Paint with PVP as a thickening agent has advantage in coating with no sagging, coating water resistance, harder film, do not fall off, stains and etc.
The transparent coating of paper containing PVP makes the printing ink drier on top of it, has good ink absorbability, does not dissolve in water, has good coagulation and diffusion. Besides PVP has important applications in other coatings, such as conductive coatings, electrode coatings, and leak-proof coatings. Such as the outside insulating layer of conductive material, after repeated hot, quenching, sun and rain, will be aging or rupture, or because of water leakage and cause electricity leakage. By adding PVP film (PVP K90) on the outside of the insulating layer, on one hand since PVP film is transparent have no influence on the original color, on the other hand PVP film is bonding with the insulating layer，it separate the insulation with heat ,hot and light. To avoid the electricity leakage by water leakage. And reduce the light and heat caused by the aging rate, extending the life of the wire, but also an appropriate increase in the hardness of the wire.
Also N-Vinylpyrrolidone plays a very important role in coating industry. Now pvpnvp is support the NVP annual demand for one of the TOP5 company in coating industry ,which is very famous from United States. They are very satisfy with our quality and service.
