Page 40 - Kutnar, Andreja, et al., eds., 2015. Proceedings of the 1st COST Action FP1307 International Conference - Life Cycle Assessment, EPDs, and modified wood. University of Primorska Press, Koper.

rovement
of
wood
properties
due
to
impregnation
of
wood

with
renewable
liquids
from
different
process
residues
of
native
origin

P.
Rademacher1,
P.
Pařil1,
J.
Baar1,
P.
Čermák1,
R.
Rousek1,
D.
Meier2,
G.
Koch2,
U.Schmitt2

1
Mendel
University/
Brno,
Dep.
of
Wood
Science
(CZ);
Peter.Rademacher@mendelu.cz

2
Thünen
Institute
of
Wood
Research,
Hamburg
(DE);
Dietrich.Meier@ti.bund.de

Keywords:
Wood
modification,
native
resources,
cell
wall
bulking,
volumetric
swelling,
durability

Introduction

Wood
modification
treatments
using
non-­‐toxic
components
are
becoming
more
prevalent
and

are
often
used
in
place
of
biocides
with
negative
environmental
effects.
However,
many

modification
processes
remain
dependant,
if
only
partly,
on
fossil
resources.
Wood
modification

processes,
based
on
renewably
sourced
solutions,
have
a
lesser
impact
on
the
environment
and

can
be
produced
in
a
sustainable
way
(Ermeydan
et
al.
2012).
The
following
investigations
show

first
screening
of
started
research
project,
carried
out
by
the
wood
research
group
of
Mendel

University,
Brno
(Rademacher
et
al.
2014).

Material
and
Methods

-­‐ Swelling
measurement:
10
samples
of
14
x
14
x
28
mm3
for
each
treatment

-­‐ Durability:
9
samples
of
5
x
10
x
30
mm3
(Bravery
Test)
for
each
treatment

-­‐ Production
of
liquid
residues
from
thermal
treatment
(TT)-­‐,
Hydro-­‐Thermal-­‐Carbonisation

(HTC)-­‐,
and
pyrolysis-­‐processes;
impregnation
to
increase
weight-­‐percent-­‐gain
(WPG)

-­‐ Impregnation
of
Beech
and
Poplar
sets
of
samples
using
vacuum
20
kPa/
1
hour
(EN
113)

-­‐ Concentrations:
Pyrolysis
1:10;
1:2,
original
(1:1
=
100%);
TT
and
HTC
concentrated
10:1

-­‐ Conditioning,
drying,
volume/weight,
leaching,
bulking
measurement
following
standards

-­‐ Durability
tests:
Bravery
Test;
fungi:
Trametes
versicolor,
decay
6
weeks
acc.
to
EN
113

-­‐ UMSP:
UV-­‐light
absorption
at
278nm,
using
Zeiss-­‐UMSP
80
(Koch
and
Grünwald
2004)

Results
and
Discussion

WPG
after
impregnation
was
about
5
%
to
8
%
in
case
of
hydrothermal
carbonisation
(HTC)
and

10
%
to
15
%
with
thermal
treatment
(TT)
residues.
Impregnation
with
pyrolysis
liquids
from

Beech
wood
powder
(liquefaction
under
heat
and
pressure)
produced
40
%
WPG
in
Beech
and

60
%
in
Poplar
(Fig.
1).
After
leaching,
high
amounts
of
TT
and
HTC
solution
were
washed
out,

whereas
Pyrolysis
liquids
stayed
with
25
%
to
40
%
remaining
in
the
wood.
Despite
higher
wash

out
rates
following
the
EN
84
leaching
test,
all
treatments
had
a
positive
effect
on
the
tested

properties.

28