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14
Junho 2012
PAINT & PINTURA
coatings, they extend the life of the coatings applied and,
as a result, the assured durability on the substrate. Given
all of these requirements, the market for adhesion promo-
ters will continue to grow, as they have become indispensa-
ble to any formulation.
Adhesion promoters are extensively used in the most varied
of paints and coatings for plastics, auto parts, building
and construction, aerospace, leather goods and surface
protection. In other words, adhesion promoters are most
needed in coatings applied to special substrates, especially
plastics in general, glass and oiled metals, to name a few.
The silanes contained in their formulation interact with
the resins to produce an effect on the adhesion properties,
thereby improving the mechanical properties of coatings.
For the UV-curing segment specifically, adhesion is cur-
rently a major challenge since the raw materials generally
used are not harmful, which usually means that they do
not attack the substrate to promote adhesion, while drying
instantly, which creates significant difficulties for adhe-
sion, as the product is not allowed enough time to react
and stick to the substrate.
By virtue of the foregoing trend and difficulties, adhesion
promoters have been increasingly improved and consumed
in UV-curing systems. As challenges and new substrates
arise, so do new trends and new adhesion promoters desig-
ned to complement the action of standard monomers and
resins in adhering to the substrate.
Adhesion promoters hold a somewhat consolidated position
for applications on plastic and metal substrates, but a
really effective additive that acts on the substrate is yet
to be developed for UV-curing coatings on glass surfaces.
Standard products on the market, such as silanes, have no
time to react with the substrate due to their instant curing
properties. Therefore, formulating adhesion promoters
with outstanding adhesion performance on glass substra-
tes remains a major challenge.
Oils & Derivatives - Sustainable Extraction
Not only do oils and derivatives come from renewable, bio-
degradable sources, they also impart important properties
to paints and coatings, such as resilience, gloss, improved
hiding power, shorter curing times, film hardening, wea-
therability and good adhesion.
A significant part of all plant oils is used in the formula-
tion of resins that are used in paints. These resins can be
used in automotive OEM and refinish coatings, decorative
paints, printing inks, etc. The most common raw materials
in these resins are plant oils, such as tung nut oil, linseed
oil, palm oil, castor oil, babassu oil and pine oil, among
others, but, of all these, linseed oil is the most frequently
used in paint formulations.
Currently serving various purposes, oils and derivatives
impart high resilience, gloss, good curing performance and
durability to paints, which means that they play diverse
roles in paint formulations, as in the case of castor oil, for
example, which is used in the formulation of resins espe-
cially to shorten curing times. Soy lecithin, for its part, is
used as an emulsifying and homogenizing agent, while pine
oil helps to mitigate paint odor.
Oils act as binders in paints, such as linseed oil, for exam-
ple, which has high curing power and is used in larger
amounts in the formulation of resins. Linseed oil-based
paints are more impregnating than other synthetic paints
during application, are strong, resilient and tough due to
their high fatty acids content. In addition, their formula-
tion contains 50-percent linolenic acids, which enable self-
-oxidization and, as a result, deliver shorter curing times,
while allowing the paint to form a firm and resilient film.
In addition to all of the aforementioned properties, by
virtue of the global requirement for an environmentally
compliant model, a new trend arises among companies
towards replacing synthetic resins with more appropriate,
more sustainable plant oils. Accordingly, countless research
efforts are now being carried out to improve the use of oils
in the paint and coatings industry.
Events - 1st Steel Packaging Congress
The 1st Steel Packaging Congress held by the Brazilian
Steel Packaging Association, known for short as Abeaço, in
Portuguese, on April 25 and 26, during Expo Embala SP, in
São Paulo, exceeded all expectations, with 137 registered
attendees. “It was Abeaço’s goal to bring information to
the market for both steel can manufacturers and packers
that use steel cans as a packaging option, so as to upda-
te them on themes pertaining to technology, innovation
and the environment, all tied up with sustainability and
recycling practices,” says Abeaço’s executive manager Thais
Fagury.
To select the lectures for presentation at the congress,
Abeaço commissioned a survey with its members to learn
what their themes of interest were. “We succeeded in put-
ting together a lecture program based on those themes.
The lectures delivered during the congress covered such
themes as the steel market, the evolution in packaging
making, innovation, and steel can applications and life
cycle,” Thais adds.