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H The field of functional coatings is broad
and versatile. Modern coatings provide
both protection and decoration and demonstrate antimicrobial, self-healing, easy-clean, self-stratifying or color switching
properties. Dr. Jamil Baghdachi, Eastern
Michigan University, focuses on the design
and formulation of eco-friendly coatings.
What makes a coating multi-functional?
Jamil Baghdachi: The standard definition of coatings as passive layers of either
protective or decorative materials is being
replaced by materials that combine protection, decoration, sensory and other stimuli-responsive functionalities all in one layer
of a coating. Antimicrobial, self-healing,
easy-clean, self-stratifying, color-switch-ing, corrosion-sensing, etc., are among
such coatings. Multifunctional coatings
provide equal or enhanced coating properties while still offering standard functionality. Understandably, a self-stratifying
coating that automatically separates into
two layers of primer and topcoat upon pro-
“Not only Protective
and Decorative”
MULTIFUNCTIONAL COATINGS HAVE BECOME POPULAR
cessing is more economical than conven-
tional coating.
How do you check the reliability of the
coating?
Jamil Baghdachi: Since multifunctional coatings share the majority of
coating ingredients and formulation
guidelines used in conventional coatings, standard test procedures apply without further modification. For
example, in the case of easy-clean
coatings, a simple user observation can
indicate this property, while the function and the efficacy of killing microorganisms is tested by standard test procedures used in hospitals, clinics and
educational institutions. It is anticipated that once multifunctional coatings
enter the mainstream, simpler property
evaluations will be developed.
What are the trends and deve-
lopments in multi-functional coatings?
Jamil Baghdachi: Among the most popular R&D topics currently pursued by both
academia and industry are still the most
well-known: superhydrophobic/hydrophil-ic, bioactive, self-healing, self-cleaning,
corrosion and durability-sensing, intumescent, and hybrid coatings. Areas such
as self-stratifying and corrosion-sensing
coatings, and those with sensory function-alities that have already shown their viability, are gradually evolving into commercial
products. Vigorous development in these
last categories is perhaps being influenced
by global interest in sustainability.
Jamil
Baghdachi,
Eastern
Michigan
University
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“New Systems are
Required”
VOC-FREE WATER-BASED COATINGS REQUIRE NEW MATERIALS
H Due to regulations and an increase in
consumer awareness, VOC-free water-based systems are demanded in all segments of the coatings industry. Charles
R. Hegedus, Ph.D., research associate at
Air Products, comments on challenges
and requirements in this area.
What are the major challenges in de-
veloping VOC-free, water-based paints
and coatings?
Charles R. Hegedus: VOC-free, water-based coatings require new polymer
systems and specialty additives to formulate coatings that will apply, wet the
substrate, dry and perform as desired.
Traditional coatings contained solvents
to help obtain many of these attributes.
Zero-VOC coatings must exhibit these
properties with polymers and specialty
additives, such as VOC-free and APE-free
superior wetting agents, coalescing surfactants, defoamers and dispersants.
What coatings segments are still domi-
nated by solvent-based products and
how can this be overcome?
Charles R. Hegedus: The main segments
utilizing solvent-based coatings are
higher-end, more demanding applications, such as industrial, aerospace, automotive (mainly clearcoats), marine, and
OEM. In order to displace these solvent-based coatings with zero-VOC systems,
new polymer systems are required. These
polymers have different properties, need
to be formulated differently and require
new co-ingredients, such as specialty
and multi-functional additives, to meet
the demands of these applications.
Where do you see the most promising
research in the field of water-based
coatings?
Charles R. Hegedus: In response to government regulations and societal demands, polymer and additives suppliers
have ramped up R&D of environmentally
friendly products that are zero-VOC, APE-free, sustainable (bio-based) and otherwise safe for people and the environment. This research has built on itself.
New polymers and application demands
have prompted new additives and formulations, all with the goal of having performance of older solvent systems but being
environmentally friendly.
Charles R.
Hegedus,
Air Products
