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10
Maio 2013
PAINT & PINTURA
In the afternoon, D’Altomare covered the theme “Formu-
lating High-Performance Coatings and Resins” through Fer-
nando Guirau, of its Coatings and Resins technical devel-
opment department. “How can you produce differentiated,
high-performance coatings and resins?” This question was
answered by a lecture on the impact of the use of acrylic,
epoxy and alkyd resin modifiers, as well as cutting-edge
surface additives, dispersants and concentrated dryers,
which also showed how these raw materials enable the de-
velopment of formulations that meet market requirements
like greater flexibility, strength and durability, always mak-
ing the lowest possible impact on the environment.
The final lecture, on the theme “Reverse Logistics,” was de-
livered by Thaís Fagury, executive manager at the Brazilian
Steel Packaging Association (known for short in Portuguese
as Abeaço).
The forum was closed by Agnelo Editora’s draw for a tablet
among attendees from paint companies and a cocktail
party.
Corrosion Inhibitors - Expansion of Eco-
Friendly Products
Corrosion inhibitors in paint formulations have become
indispensable for protecting coating films from corro-
sion and imparting greater weatherability and humidity
resistance. In addition, technological advances focus on
environmentally friendly products formulated without any
heavy metals.
The demand for corrosion inhibitors has been increasing
in volume and tends to be even more so over the next few
years due to the new investments that are being made
in several Brazilian markets, especially the construction
and automotive industries, as well as the growing trend
towards replacing solvent-based paints with water-based
formulations.
Applicable to all kinds of paints and coatings, corrosion
inhibitors are primarily used to protect coating films from
corrosion and impart greater weatherability and humidity
resistance. In addition to these properties, manufacturers
are now focusing their efforts on the development of eco-
-friendly technologies, i.e. heavy metal-free products that
provide superior performance compared to traditional
corrosion inhibitors.
A corrosion inhibitor can be described as a material that
weakens the aggressive nature of corrosion by reacting in
the metal-metal solution or the coating-metal interface.
“Accordingly, the ideal corrosion inhibitor must be effec-
tive with any pH levels, reactive on the metal surface to
deliver a product with lower solubility than a non-reactive
inhibitor, have a solubility low enough to ensure that it
will not be eliminated from the coating due to environmen-
tal exposure, capable of forming a film in the substrate-
-coating interface that will not reduce the adhesion of
the coating to the substrate, and act as a both anodic and
cathodic inhibitor,” says Metachem’s business manager
Selena Mendonça.
There are three ways of reducing or preventing rust with
corrosion inhibitors: setting up a barrier to minimize the
permeability of oxygen and water through the metal sur-
face —this is the primary function of paints and coatings;
neutralizing the metal surface before applying the coating
by using a protective treatment, such as phosphatization;
and incorporating corrosion inhibitors into the coating,
which will migrate to the interface and neutralize the
active sites on the metal surface. “The process stages at
which these products are used may vary depending on the
application and the choice of corrosion inhibitor pigments
or additives,” Selena concludes.
Carbon Blacks - Remarkable Properties
Carbon black manufacturers have been developing tech-
nologically advanced products to meet the paint industry’s
various needs and requirements.
Having important properties and regarded as the most
perfect black pigments in existence, carbon blacks provide
coloristic performance, UV protection and improved wea-
therability, while being easily dispersed in liquid water or
solvent-based systems, oils or electrostatic coatings.
The properties of carbon blacks are also essential to facili-
tating processability in paint formulations, reducing costs,
enhancing jetness and gloss, lowering pigment flocculation
and improving paint stability. In masstone, they provide a
strong, deep blue shade of black.
Notwithstanding all of these properties that make carbon
blacks important pigments, paint manufacturers are more
and more demanding and pushing for quality raw mate-
rials, so that they can produce innovative, high-quality
products according to the specifications for construction,
maritime, industrial and automotive coatings.
Accordingly, the required properties of carbon blacks can