Photopolymerizable
Triglycerides
Coatings
Derived
from
Epoxidized
Jürgen O. Metzger[a], Dietrich Bartmann, Horst Peters, Urs
Lübker[b], Alexandra Lott[c], Wieland Sack[d], Achim Diehlmann
and Günter Kreisel[e]
[a]
University of Oldenburg, D-26111 Oldenburg; [b] Dreisol
Coatings, D-32361 Pr. Oldendorf-Holzhausen; [c] Lott-Lacke
GmbH, D-33729 Bielefeld; [d] INNOFORM, D-49205
Hasbergen; [e] University of Jena, D-07743 Jena
Sustainable development had become the key ideal of the 20th
century. In the search for sustainable chemistry, considerable
importance is being attached to renewable raw materials which
exploit the synthetic capabilities of nature.[1]
Industrially, vegetable oil epoxides are currently used mainly as
PVC stabilizers. New applications have been opened by the
possiblility of photochemically initiated cationic curing.[2]
The processing of coatings is an important source of VOCs.
Until the early 1980s paints usually contained 50-70% of
organic solvents. Considerable efforts have since been made to
reduce the solvent content of paints significantly and abandon
use of solvents with the highest hazard potential.
Radiation-curable systems are totally solvent free. Thus, there is
no solvent recovery problem and no pollution. However, most
radiation-curable systems are based on acrylates.
Recently, we could show that epoxidized linseed oil which is
commercially available can be cured using cationic
photoinitiators to give high quality coatings.[3] Life cycle
analysis of coatings based on acrylates compared to epoxidized
vegetable oils revealed an important ecological advantage of the
latter.
1
2
3
U. Biermann, W. Friedt, S. Lang, W. Lühs, G.
Machmüller, J.O. Metzger, M. Rüsch gen. Klaas, H.J.
Schäfer, M.P. Schneider, Angew. Chem. Int. Ed. 2000,
39, 2206-2224.
J.V. Crivello, R. Narayan, Chem. Mater. 1992, 4, 692699.
J.O. Metzger, Chemosphere 2000, 43, 83-87.