The "Hidden Champion" Role of White Carbon Black in Coatings
Function positioning:
Thickening rheology control: the vapor phase white carbon black forms a gel network through hydrogen bonding, which increases the viscosity of water-based paint from 1000mPa · s to 5000mPa · s, preventing construction sagging.
Extinction and Whitening: The refractive index of amorphous white carbon black (1.457) is close to that of resin. Adding 5% can reduce the glossiness of varnish from 90% to 30%, meeting the requirements of matte coatings.
Anti settlement and anti water separation: In anti-corrosion coatings, white carbon black prevents filler settlement through steric hindrance effect, and the storage stability is extended from 3 months to 12 months.
Innovative applications:
Wind turbine blade adhesive: Hydrophobic modified gas-phase white carbon black developed by Total Chemical reduces the viscosity decay rate of epoxy resin from 40% to 5% in 7 days, solving the problem of large blade infusion.
Self cleaning coating: Japanese insecticide company modified the surface of white carbon black with fluorine to achieve a contact angle of 150 °. After application to building exterior walls, the amount of dust adhesion is reduced by 80%.