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RadTech
UV/EB Technology Conference & Expo 2008
May 4-7, 2008
Lakeside Center at McCormick Place
Chicago, Illinois - United States of America
RENEWABLE RESOURCES / GREEN CHEMISTRY
Alkyd-derived Urethane
Acrylate Oligomers in UV Curable Coatings;
Synthesis and Properties
Anthony J. Tortorello, DSM Desotech, Inc.
Abstract:
As part of our continuing effort to control cost by reducing dependence
upon petrochemically derived raw materials, we have developed an oligomer
chemistry based, in part, on renewable resources. Naturally derived
oils were modified and incorporated into urethane acrylate oligomers
that can form a substantial part of a UV curable coating composition.
This report will discuss the synthesis of the oligomer and the resulting
physical properties. Dependence of both liquid and cured film properties
upon oil and oligomer structure will be presented.
Bio-based
Routes to UV Curable Materials
Dong Tian, Armstrong World Industries,
Inc.
Abstract: Global environmental concerns are driving reduction
of greenhouse gas emissions. Increasing demand for fossil fuel based
resources has caused escalation in the cost of chemicals. As a result
of these and other market pressures, companies increasingly are
developing products and manufacturing processes that are more environmentally
sustainable. This paper reviews progress in bio-based routes to
make UV-curable materials and describes a new alternative, sustainable
method of producing polyester polyols and acrylated polyester polyols.
Cationic
Photopolymerization Behavior of Epoxidized-Cardanol
Containing Coating Materials as a Func
zhigang chen, Center for Nanoscale Science
and Engineering, NDSU
Abstract: Cationic photopolymerization of epoxidized-cardanol
(ECD) containing, cationic UV curable coating materials was systematically
investigated using Real-Time FTIR (RTIR) as a function of relative
humidity. The hydrophobic, bio-renewable ECD was used as a "humidity
blocker" to mitigate the interference of ambient water with
cationic photopolymerization under higher humidity, and varied amounts
of oxetane and polyol are used as reactive diluents to enhance the
photopolymerization conversion. Higher and more consistent monomer
conversion was found for formulations containing optimized amounts
of ECD and hydroxyl-functional reactive diluents under different
relative humidity tested.
Floor
Coating Formulations Obtained from 100% Natural, Renewable
or Bio-based Materials
Jeffrey Ross, Armstrong
Abstract: A variety of raw materials are used in so-called
"greener" coating systems. This paper summarizes what
this means for several "green" categories, and how to
use these items to formulate floor coatings. Materials covered include:
seed, nut, grass and softwood products; bio-fuel waste; modified
small molecules; materials from enzyme catalyzed reactions; and
renewable inorganic fillers. Also reviewed are selected commercially
available "green" coating systems for flooring. Finally,
performance of selected model systems will be reported.
Synthesis
of Difuran Derivatives by Photolytic Coupling
for Use as Biorenewable Monomers
Chris Comer, University of Iowa
Abstract: Difuran derivatives were synthesized using 2-furfural,
furan, furfuryl alcohol, and 2-(2-furyl)-1,3-dioxolane by photochemical
coupling with 5-bromo-2-furfural in a flow-through system with an
anionic exchange column. The reactions were performed with various
UV light sources. The coupling of 5-bromo-2-furfural and furan produced
the highest yields. [2,2'-Bifuran]-5-carboxaldehyde will be used
to synthesize a methacrylated monomer which can be used to crosslink
photopolymerized polymers by Diels-Alder reaction. The physical
properties of these polymers will be analyzed.
Nano-structured Particles for GREEN Coatings
Maria Nargiello ,
Evonik Degussa Corporation
Abstract: The field of environmentally friendly coatings using GREEN chemistries has dramatically expanded over the last 10 years, as there is more global consciousness to reduce emissions. Many formulating strides have been made in the fields of water based, high solids, powder and radiation cure technologies to improve appearance, durability and overall performance. In all of these different types of coatings, nano-structured particles whether as a powder or in pre-dispersed form, plays a critical role to improve performance. Two of the most popular classes of particles, are based on SiO2 and Al2O3. Nano-structured particles based on SiO2 have been used for decades in numerous types of coating chemistries to enhance rheology of liquid systems with respect to thickening, anti-settling, anti-sag and suspension of pigments and fillers. Novel dispersions of such particles are introduced to water-based coatings to facilitate ease of handling, while promoting suspension of pigmented systems, without significant change to the systems viscosity. Structured modified technology creates particles which are used to enhance scratch resistance. Nano-structured particles based on both SiO2 and Al2O3 are used to enhance free flow behavior, fluidization, transfer efficiency and charging characteristics of powder based coatings. Particles based on Indium Tin Oxide have been optimized to achieve transparent conductivity and IR absorption. This paper will address how nano-structured particles based on SiO2, Al2O3, ITO are differentiated and modified to create specially tailored additives to enhance the performance of GREEN coatings. Performance attributes which will be addressed include rheology, free flow, scratch resistance, transparent UV and IR absorption and Conductivity.
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