What role does hollow glass beads play in paint and coatings

Application of Hollow Glass Beads in Paint Coatings

Glass beads have the smallest specific surface area and low oil absorption rate, which can greatly reduce the use of other production components in coatings. The vitrified surface of glass microspheres is more resistant to chemical corrosion and has a reflective effect on light. Therefore, the coating has anti-fouling, anti-corrosion, anti-ultraviolet, anti-yellowing and anti-scratch effects. Tightly arranged hollow glass beads contain rarefied gases, and their thermal conductivity is low, so the coating has a very good thermal insulation effect. Hollow glass beads can effectively enhance the fluidity and leveling of the coating. Hollow glass microspheres contain gases which have good cold and heat shrinkage resistance, thus enhancing the elasticity of the coating and greatly reducing the cracking and shedding of the coating caused by thermal expansion and contraction. Under the premise of high filling content, the increase of the viscosity of the coating is not obvious, so the use of solvent can be reduced, which can reduce the emission of toxic gases in the use of the coating and effectively reduce VOC index.

Suggestions for use: The general addition amount is 10-20% of the total weight. The hollow glass beads are dispersed by mixing equipment with low speed and low shear force. Because the beads have good spherical fluidity and little friction between them, they are easy to disperse. They can be completely wet in a short time and evenly dispersed by slightly prolonging the mixing time. Hollow glass beads are chemically inert and non-toxic, but due to their extremely light weight, special attention should be paid to their addition. We suggest to adopt step-by-step addition method, that is, adding 1/2 of the remaining beads at a time, gradually, so as to avoid the floating of beads into the air and make the dispersion more complete.