Improve the performance of dry coating film by controlling the release of IPBC

Microbicides are necessary to prevent microorganisms from damaging many industrial coatings. There are two main uses for fungicides: (
a
) to prevent damage to wet products during storage and transport (in-tank protection),
(b)
to guarantee long-term coating performance (dry film protection)
1
.
, water-based and solvent-based coatings are susceptible to fungi and
/
or algae reproduction. The growth of microorganisms on dry film not only affects the appearance (color change) of the coating, but also its properties (biological corrosion). Fungi can penetrate the coating and cause the coating to crack, foam and adhesion to decline, thus also leading to decay or corrosion of the substrate below. On porous substrates such as plaster, cement and bricks, algae appear to multiply faster, sealing water inside. The freezing and melting of the water contained in it can cause the coating to crack or improve its passing performance, which can lead to coating damage. The presence of water also encourages the reproduction of other microorganisms, which in
2
. The ability of microorganisms to reproduce in a coating depends on several factors, including the moisture content of the surface, the presence of nutrients, the composition of the substrate and the composition of the coating
3
.
in order to achieve maximum efficiency, a fungicide is required at the coating interface. This makes it susceptible to leaching. Controlling the release of fungicides through closure ensures that the concentration of fungicides at the surface interface is always kept to a minimum, thus extending the life of the coating. In addition, controlling this release reduces the amount of fungicides released into the environment over time.
this article describes how to control the function of
IPBC
(
3-
iodine
-2-
propanoyl butyl amino acid) is released. The long-term protective effect of the surface can be guaranteed by mutual adsorption between the fungicide and the carrier
4,5
. This makes the fungicide more resistant to leaching. Closed
IPBC
released more slowly than
IPBC
, which can be measured using analytical and biological methods. Closed fungicides are also more resistant to the degradation of
/
in the environment. In addition, outdoor exposure tests
paint
a closed IBBC coating show enhanced protective effect on dry film.
experiment
paint film sample preparation
the closed and not closed
IPBC
in different amounts added to the paint sample. Prepare
3
thick paint film on scraped card paper for at least 24
hours
room temperature.
measurement
The
IPBC
which is present in the water filtered by the IP
BC
prepares a paint sample containing
10,000 ppmIPBC
as described above. Hang the paint film in
100 mL
water and stir continuously. The filtered water is collected at different intervals, and the concentration of the ipBC is analyzed by gas chromatography and ultraviolet visible
the
spectrometer. The
concentration

IPBC
was measured using the standard
IPBC
.
use
The X
-ray fluorescence spectrometer (
XRF
) quantitatively measures the
IPBC
in the paint film, prepare a paint sample containing
2,000 ppmIPBC
as described above, and leach at
1
liters per hour at different intervals. Samples are dried for
24
hours. Analysis
iodine content of
6 in the sample using the PANalytical Epsilon 5 X X
-ray fluorescence spectrometer
(XRF)

. The standard
IPBC
curve is drawn using
IPBC
at different concentrations and has been linear at concentrations of up to
4,000 ppm
in
IPBC
. Linear correlation is independent of the color paint formulation used to prepare the paint film. A baseline for each paint film is obtained before and after leaching.
can be used to
Y
prepare a paint sample containing
1,000 ppm IPBC
as described above. Place the sample in
QUV
unit
UVB
lamp for
24
hours. Use a 1-photonometer (
Konica Minolta
's
CM2500d) for
1
hours after removing the paint film from the
QUV
unit)
measure the yellow change index (
YI
) (
ASTM E313-10
the recommended method criteria for calculating the yellowness index and whiteness index by measuring the chroma coordinates of the instrument). After
QUV
exposure, the yellow change index (
YI
) of the
YI
of the sample treated with the fungicide minus the yellow change index (
YI
) of the untreated controlled sample was
obtained
.
Efficacy Study
Accelerated Fungal Trials
measured the efficacy of various fungicides on the paint film using
ASTM D 5590
(measuring the paint film and associated coating resistance to fungal damage with a four-week accelerated agar plate test). As described above, the preparation of the sample, the difference is added to the paint sample
IPBC
concentration of
500 ppm
. As described above, the paint sample was leached and inoculated with a mixture of black penicillin (
ATCC 6275)
, rope penicillin
(ATCC 11797)
, with a final concentration of
107
spores
/mL
. The plate is then hatched at a temperature
28
C
and relative humidity
85%
for
28
days. The growth rate of the painted sample surface fungus is rated at
0-4
, with "
0
" indicating no growth and
1
representing a small amount of growth
(< 10%)
The
2
indicates a
growth rate (10%-30%)
The
3
indicates moderate growth
(30%-60%)
The
4
indicates severe growth
(60%
to full coverage
)
.
outdoor test stand
prepare paint samples containing
3,000 ppm IPBC
(closed and unooled). Use western red pine as a base. Paint a primer on the smooth side of each plate and an aluminum paint on the back. Divide the plate into three equal parts
1
feet long. In the middle as a control, and then apply two antibacterial paint. On the left and right, two finishes treated with fungicides are applied. After drying, expose the plate
north at
90o angle.
results and discussions
the study used different ways to control the release of
ipBC
in the paint film. Place the paint film in water to collect leachate at different intervals. The concentration of the leaching ipBC is measured using
UV
photomeometer. Figure 1
1
the content of the ICBC
accumulated
leachate. The
of
IPBC (
IPBC CR
) results in a decrease in the amount of
IPBC
leached from the paint film. To measure the amount
of
IPBC
left on the coating surface,
studied non-destructive
X
-ray fluorescence (
XRF
) measurement methods. As shown
,
closed the
IPBC

, and the amount
of
IPBC
left in the paint film is high. The amount of
released
IPBC is also related to the inherent performance and composition of the paint. In this example
the
is higher than the amount of
IPBC
remaining in the
-color paint film.
also used microbiological tests to prove the
The IPBC
release of the device. The
test is performed using the
method of assTM D5590. In a four-week accelerated study,
the
the fungus on the sample after 28 days of incubation. As shown in Table
1
, a closed
IPBC
(
IPBC CR
) provides long-term protection (grade
0
) to the sample surface after leaching.
also experimented outdoors. Boards containing closed and
ipBC
are exposed on the test stand. In these studies, acrylic exterior paints were used that quickly turned bad. After
18
months of exposure, the extent of damage to the surface of the sample paint film was assessed. As
3
, samples containing closed fungicides show minimal damage.
to conduct additional tests to prove that it will
IPBC
, reducing the degree of yellowing when exposed to ultraviolet light. Exposure of paint samples containing
1,000 ppm
different fungicides to ultraviolet light (
B-
lamps,
24
hours). As
4
, two different color paint samples to be tested, the fungicide will be closed, after ultraviolet light exposure is not easy to yellow.
。