The development of photocatalytically active paints is not easy,
since a key part of stable paint development is the creation of better barriers to the photocatalytic mineralisation process, so that
the polymer binder remains intact longer and the paint exhibits
an appreciable lifetime as a coated film. Thus, in the preparation
of a photocatalytic paint it is important to find a compromise
between maintaining a reasonable degree of photocatalytic activity and still retaining a good paint stability. Clearly, a high level
of photocatalytic activity in a paint will produce a low paint lifetime due to light-induced weathering and photo-chalking. On the
other hand there must be sufficient photocatalyst so as to achieve
a reasonable level of photo-induced self-cleaning.
Photocatalytic water-based facade acrylic paints contain typically three major components, namely: acrylic binder, pigment
and photocatalyst [6–8]. For example the photocatalyst coating
patented by Millenium Inorganic Chemical [8] consist of 5–40%
(by volume) of photocatalyst, styrene acrylic copolymer binder,
additional pigment (e. g. non-photocatalytic TiO2), calcium carbonate, solvent thickeners, dispersants, coalescents and antifogging
agents. The total amount of pigments (including photocatalytic
TiO2) is minimally 65% (by volume) [8]. This paper describes the
results of an investigation into the parameters which influence
the photocatalytic activity and stability of a water based paint with
an acrylic binder containing either TiO2 or ZnO as the photocatalyst
and the results are relevant to those working in the area of photocatalyst paint development.
The development of photocatalytically active paints is not easy,since a key part of stable paint development is the creation of better barriers to the photocatalytic mineralisation process, so thatthe polymer binder remains intact longer and the paint exhibitsan appreciable lifetime as a coated film. Thus, in the preparationof a photocatalytic paint it is important to find a compromisebetween maintaining a reasonable degree of photocatalytic activity and still retaining a good paint stability. Clearly, a high levelof photocatalytic activity in a paint will produce a low paint lifetime due to light-induced weathering and photo-chalking. On theother hand there must be sufficient photocatalyst so as to achievea reasonable level of photo-induced self-cleaning.Photocatalytic water-based facade acrylic paints contain typically three major components, namely: acrylic binder, pigmentand photocatalyst [6–8]. For example the photocatalyst coatingpatented by Millenium Inorganic Chemical [8] consist of 5–40%(by volume) of photocatalyst, styrene acrylic copolymer binder,additional pigment (e. g. non-photocatalytic TiO2), calcium carbonate, solvent thickeners, dispersants, coalescents and antifoggingagents. The total amount of pigments (including photocatalyticTiO2) is minimally 65% (by volume) [8]. This paper describes theresults of an investigation into the parameters which influencethe photocatalytic activity and stability of a water based paint withan acrylic binder containing either TiO2 or ZnO as the photocatalystand the results are relevant to those working in the area of photocatalyst paint development.
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