8 / 21
allied
academies
Notes:
Page 22
November 13-14, 2017 Paris, France
5
th
International Conference on
PLASMA CHEMISTRY AND
PLASMA PROCESSING
Journal of Biotechnology and Phytochemistry
Volume 1, Issue 2
Plasma Chemistry 2017
Polyester powder coating of wood and wood
composites with atmospheric pressure plasma jet
(AAPJ)
Robert Köhler
1
, Philipp Sauerbier
2
, Lars ten Bosch
1
, Holger Militz
2
and
Wolfgang Viöl
1,3
1
HAWK University of Applied Sciences and Arts, Germany
2
University of Gottingen, Germany
3
Fraunhofer Institute for Surface Engineering and Thin Films, Germany
Introduction:
Powder coating processes represent an alternative
to conventional coating methods. Especially, the possibility
of total omission of all kinds of additives comprising volatile
organic compounds or organic solvents renders this process
environmentally friendly. Furthermore, it omits the need for
special substrate properties such as electrical conductivity. The
electrical conductivity is particularly important for standard
powder coating processes, as the powder adheres to the substrate
due to different electric potential, is applied to the powder-
substrate-system. To charge a powder, commonly a corona
discharge is used and the powder is sprayed onto the grounded
substrate. In case of wood and wood composites, the limited
electrical conductivity constitutes a disadvantage. To coat a non-
conductive and porous substrate like the beforehand mentioned
ones a pre-heating or priming process using an electrically
conductive wet lacquer is usually necessary.
Materials & Methods:
In this study, an APPJ has used to
applicate a polyester powder (Interpon 610 MZ013GF; D50
≈ 50 μm) (Akzo Nobel Powder Coatings GmbH, Arnsberg,
Germany) to wooden and wood-like substrates. The powder
material is based on iso- and terephthalic acid and was deposited
using the effluent plasma zone of the source in use. The coating
substrates are European beech wood (Fagus sylvatica L.), Grand
fir (Abies grandis lindl) and medium density fiberboard (MDF).
After the plasma treatment, the coating was annealed in an oven
at 180°C for 10 min. The coated samples were examined via
X-ray photoelectron spectroscopy (XPS) and Fourier-transform
infrared spectroscopy (FTIR) to determine possible chemical
decomposition of the applied polyester during the plasma
coating process. In addition, the resulting layer thicknesses of
the samples were determined using laser scanning microscopy
(LSM). Adhesive strength investigations were carried out
using dolly test based on ASTM D 4541-02 and DIN EN ISO
4624:2016-08
Results:
The applied powder material exhibited no chemical
changes due to plasma process and the adhesive strength of the
layers met practical requirements of >1 MPa. The presented
atmospheric pressure plasma coating process for wood and
wood-based materials could represent an interesting alternative
to existing wood coating methods.
Biography
Robert Köhler is pursuing his PhD at University in Göttingen. His thesis is
concerned with “The weathering resistance and the catalytic degradation of
VOC`s of plasma particle-modified wood and wood materials”. Currently, he
is a research scientist at the project “PLaNaWood2- functionalization of wood
and wood materials” with financial support from the German Federal Ministry
of education and research. He has published one poster presentation and one
patent.
robert.koehler@hawk-hhg.deRobert Köhler et al., J Biot Phyt 2017