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Moisture and opacity are the only reason coatings need titanium dioxide over CPVC.
modern fillers do more than just increase the volume of the coating. Experts from Hempel and Omea discussed the potential of the latest innovations and fillers to reduce dependence on titanium dioxide
china
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at least for titanium systems that exceed the volume concentration of critical pigments, the only reason titanium dioxide is needed is wet and opaque. Insufficient binders leave small air-filled holes after the coating is dried. Because of the greater the difference in refractive index between air and inorance fillers, the greater the opacity above the CPVC.
the use of
, however, this strategy has its drawbacks and limits its use. "If we introduce gaps in the coating film, we also introduce some uncertainties because of the huge interface differences between pigment surfaces and polymer surfaces," says Satntiago Arias of Filler Manufacturer Hempel. This improvement (introducing voids) is likely at the expense of some of the properties of the coating film. He added, "Depending on the type of coating you need, different types of fillers can partially replace titanium dioxide." To do this, you need to consider what the main characteristics of the coating are. "
generally speaking, particles similar to the fine particles of titanium dioxide do have opaque properties." When these ultra-fine inorganica fillers are dispersed under the presence of titanium dioxide, they help to avoid the optically invalid lumps of titanium dioxide. In this case, up to 20% of titanium dioxide can be replaced without losing its optical properties.
trend of fillers in these coatings is
Gysau expects that in addition to reducing reliance on titanium dioxide, the demand for more powerful inorganica fillers will increase. "There are many reasons for this, such as sustainability trends - costs and their volatility, availability and regulatory considerations, while regulation covers the environment, safety, health and sustainability," he explains. Satntiago Arias,
from Hempel, agrees, noting that "new fillers should be consistent with global environmental trends aimed at reducing VOCs, which also require high solid content, solvent-free or water-free properties in coatings." "