Since the C-N-CO group of PVP is similar to the peptide bond of protein, it has good affinity with skin and hair, as well as protective and moisturizing effects, and can improve the efficacy and feel of cosmetics. For example, adding PVP to shaving cream can promote the softening of beards and increase lubrication, and adding PVP to hair dye can adjust the color of the hair dye and increase the durability of the color.
PVP has a dispersing, stabilizing and viscosity-increasing effect on hair dye creams, which can make the emulsified system evenly dispersed and stable, and can be placed for a long time without precipitation; adding PVP to shampoo can also stabilize the foam.
PVP has good film-forming properties and can form an elastic and shiny film on the hair. It is not easy to peel off and is very easy to wash, so it is widely used in hair cosmetics such as hair spray and mousse to play a film-forming and shaping role.