Coating is a viscous suspension composed of pigments, oils, paints
(resins), solvents and drier, etc. It is coated on the surface of
the object by the oxidation of air and the volatilization of
solvents to form a tough coating film, which plays a decorative and
protective role on the object. The pigment in the paint not only
makes the paint film show different colors, to achieve beauty and
decoration, it can also enhance the mechanical strength and
adhesion of the paint film, and prevent the penetration of
ultraviolet light and moisture, so that the paint film itself
delays the aging effect and extends the service life.
White pigments are the most widely used pigments, white paint and
light-colored paint are used in it, so in the paint, the amount of
white pigments is much more than other pigments, and the white
pigments that can be used for paint are often zinc white, zinc
barium white and titanium dioxide. Due to the development of
coating industry varieties, synthetic resin coatings appear, its
polymerization degree is large, such as adding zinc white, because
zinc white has alkaline, and the function of drifting fatty acids
in the coating, and there is a tendency to thicken; If zinc barium
white is added, the weather resistance is poor. However, the use of
titanium dioxide can improve the above shortcomings, because the
particles of titanium dioxide are small and uniform, the
photochemical stability is high, the covering rate is more than two
times that of zinc white, zinc barium white, and the achromic power
is 5 to 6 times, so the amount of pigment in the entire paint can
be greatly reduced, and the paint color made is good and not easy
to yellow. And has heat resistance and acid resistance, sulfur
resistance, alkali resistance and other chemical stability,
especially rutile titanium dioxide, its structure is stable,
weather resistance is better than anatase, ultraviolet radiation
resistance, in the outdoor will not powder and other advantages, so
it is suitable for a variety of advanced ships, Bridges,
automobiles, buildings and other outdoor coatings with high weather
resistance. Anatase titanium dioxide is generally only used for
indoor coating. It can be seen that titanium dioxide has become an
essential white pigment in the production of coatings. About 60% of
the world's titanium dioxide is used in the production of various
coatings