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World Changing Technologies Pte Ltd
Microbecide PCO Sealant Overview
Microbecide PCO (Photocatalyic Oxidation)
Sealant is a custom manufactured, self-cleaning,
photocatalyst surface treatment or coating.
Microbecide PCO Sealant uniquely combines
Titanium Dioxide (TiO2), Silicon Dioxide (SiO2) and
Ionic Silver (Ag+) to impart an active photocatalytic
oxidation function to a coated surface.
Generally, detergents reduce the surface tension
of water and the contact angle is lowered. When a
PCO Sealant coated surface is exposed to light,
the contact angle of the sealed surface with water
is reduced gradually. After enough exposure to
light, the sealed surface reaches super-
hydrophilicity. In other words, it does not repel
water at all, so water cannot exist in the shape of
a drop, but spreads flatly on the substrate. The
hydrophilic nature of the sealant, coupled with
gravity, enables pollutant particles to be swept
away following a water stream making the coated
surface self-cleaning.
Water drop
Non-PCO Sealant coated
Water drop
PCO Sealant coated
Figure-1
Difference between coated and non-coated surface
Non-PCO Sealant coated
Super HydrophilicityMicrobecide PCO Sealant imparts an active
photocatalytic oxidation function to a PCO
Sealant coated surface. The coated surface will
also exhibit super hydrophilicity features under
light irradiation. The contact angle of the surface
will be reduced to <10 degrees, which brings the
following benefits.
Water will not form a water drop on a surface
when its contact angle is <10°, it will form a
complete water film. The water will be in a flat
condition on the surface.
Generally, cleaning agents reduce the contact
angle of water on a surface. This is the
hydrophilicity feature. PCO Sealant simulates this
feature, so that a single water wash on the
surface can reach the same effect as a traditional
washing with detergent.
PCO Sealant coated
PCO Sealant coat on Aluminum panel
Washing or wiping the surace with only water, the
surface will be cleaned as after a traditional wash
with a cleaning agent.
PCO Selant promotes transpiration of coated
surfaces or objects. If a panel in the compressor
of an air condition is coated with PCO Sealant the
air conditioning system will show better efficiency.
If a building wall is coated with PCO Sealant, the
building will need less energy to cool down in
summer. The hydrophilic feature can keep the
water on the surface and the entire surface can
be covered with only a little water. This will prompt
its transpiration. The hydrophilicity also makes the
coated surfaces self cleaning, they wash clean in
rain.
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
Self-Cleaning Surfaces
Photocatalyic Oxidation (PCO)
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Organic pollutant
Inorganic pollutant
PCO Sealant coated surface
(In the presence of light, PCO Sealant will decompose the organic pollutants. Without the adhesion of organic pollutant, any remaining inorganic pollutant on the surface can be easily swept away.)
Broad-Spectrum Antibiosis and Anti-Mold There are 2 benefits of this feature.
i. PCO Sealant can prevent mold or moss, so it will keep marbleand granite buildings cleaner.
ii. Broad-spectrum antibiosis provides beneficial results notonly to the coated surface but to the surrounding air flowalso.
Anti-UV FeaturePCO Sealant can absorb UV and protect the coated surface.
UV light may make some colored surface fade. PCO Sealant
can protect the surface from UV damage.
Antistatic FeatureThe antistatic feature can resist static adsorption of
small dust such as ash, coal powder, smoke, etc.
PCO Sealant coated Non PCO Sealant coated
Organic Decomposition Feature. When PCO Sealant is exposed to light, it can decompose almost all the organic substance on the surface, which provides the following benefits.
When the PCO Sealant decomposes the
absorbed organic pollutant on the surface like oil,
it will make the surface cleaner, and after the oil is
decomposed, other inorganic pollutants will be
unlikely to stay on the surface. The surface can
be easily washed down by rain or other cleaning
methods.
The PCO Sealant can also purify the air around
the building. PCO Sealant will purify the NOx gas
generated by cars. When the building or road side
walls are coated, the surface is cleaned and the
surronding environment is greatly improved as
well.
PCO Sealant coated
(Organic and inorganic pollutants are strongly
adsorbed on the surface of the wall which is coated
with PCO Sealant.
Normal surface Antistatic surface
Tips: How to take advantage of the super-hydrophilic feature? The super-hydrophilic feature can provide the same effect as a detergent (reduce the contact angle of the surface).
Self-cleaning: If there is rain, the PCO Sealant provides a self-cleaning action after rain wash. The rain wash has the same
effect as a traditional wash on the surface with detergent.
Easy-cleaning: If there is no rain, simply wash the surface using water. A single water wash will have the same effect as a
traditional wash with detergent.
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
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Advanced Air Purification Solution – Microbecide PCO SealantObjective: Outdoor air purification (car and industry exhausts
purification)
Indoor air purification (Sick-house Syndrome, VOCs)
Air purification device and filter industry
Solution: PCO Sealant is a next generation of air purification
technology, which can treat air pollutions caused by
more than 85% kinds of harmful gases such as car
exhausts NOx, formaldehyde, benzene, VOCs. At
the presence of light, PCO Sealant produces
hydroxyl radicals and holes (h+), which react with
organic materials and harmful gases to produce
water and carbon dioxide. There is no extra pollution
in the whole purification process. PCO Sealant
reacts as a catalyst in the chemical reaction so that
its performance will continue for extended time and
it will never be consumed.
Features: Purify most air pollution include NOx and VOCs
100% mineralize harmful gas to H2O and CO2
Environmental-friendly, no extra pollution
Organic pollutant decomposition
Catalytic action mode, longtime performance
Odor control
Broad-spectrum antibiosis
Benefits:
Notes: 1 High Efficiency Particulate Air Filters 2 Electrostatic Filters 3 Ultraviolet
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
HEPA1 ES Filter2 Ozone UV3 Minus-Ion PCO Sealant
Mold Good Normal Good Good Normal Excellent
Germs Excellent Normal Good Good Normal Excellent
Virus Normal Normal Normal Normal Normal Excellent
Dust Mite Excellent Good Normal Normal Normal Normal
Toxicant Normal Normal Good Good Normal Excellent
Odor Normal Normal Good Normal Good Excellent
Smoke Good Good Good Normal Excellent Good
VOCs Normal Normal Good Good Normal Excellent
Allergen Good Good Good Normal Excellent Excellent
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Typical PCO Sealant Decomposition
NO3
Notes: 1. The above table show that the end product of PCO Sealant's photocatalytic reaction is
completely safe to humans and does not pose a secondary pollution risk.The mark ● means this component is available in the end product of relative reaction.2.
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
End Product Pollutant Source ChemicalReaction
H2O CO2N2,
- O2
Ammonia Urine, Garbage, Sweat, Smoke
2NH3+6OH→N2+6H20 ●2 ●
Acetaldehyde Garbage,
Smoke, etc. CH3CHO+6OH+O2→2CO2+5H2O ● ●
Acetic acid Garbage,
Smoke, etc. CH3COOH+4OH+O2→2CO2+4H2O ● ●
Methane Gas fuel,
Garbage, etc. CH4+4OH+O2→CO2+4H2O ● ●
Carbon monoxide Car exhaust, Smoke, etc.
CO+2OH→CO2+H2O ● ●
Nitrogen oxide Car exhaust, Smoke, etc.
2NO+4OH→N2+2O2+2H2O ● ● ●
Formaldehyde Binder, Resin,
Paint, etc. HCHO+4OH→CO2+3H2O ● ●
World Changing Technologies Pte Ltd
Next Generation Building Cleaning Solution – Microbecide PCO Sealant Objective: Buildings - self cleaning, protection and energy
saving. Roads - self-cleaning, protection and car exhaust purification
Solution: Microbecide PCO Sealant is a
combination of TiO2, SiO2 and Ag+ technology.
Just simply spraying PCO Sealant on the
building exterior surface will provide excellent
features to the building.
Also, PCO Sealant can be sprayed on roads
and road sides to provide self-cleaning & air
purification functions to the road. PCO Sealant
can keep the building or road in a very new
apperance and reduce cleaning & environment
protection costs and water consumption.
Features: ./ Super hydrophilicity ./ Organic pollutant decomposition
. / Broad-spectrum antibiosis and anti-mold
./ Anti-UV protection
./ Surface antistatic
./ Self-cleaning
./ Easy-cleaning
Benefits: Keep buildings looking new and clean
Protect the surface from dust, acid rain and air pollutant damage
Purify the air of pollutants near and on the surface (e.g. car
exhausts NOx, Formaldehyde, Benzene, VOCs)
Decompose organic pollutants on the surface (e.g. oil, graffiti)
Leave the surface without water stain after raining
Reduce energy consumption for cooling buildings in summer
Prevent mildew or alga growing
Absorb the UV from the sun and protect the surface from UV damage
Prevent electrostatic adsorption of pollutants
Y
Y
Y
Y
Y
Y
Y
Y
Y
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
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Example.1 Surface: Product:
Apply Method: Spray Organic pollutant decomposition
Marble PCO Sealant Period: 24 hours
Write “TEST 9/6” by orange pen on the marble without PCO Sealant coat on 9th June.
Write “TEST 9/6” by orange pen on the
marble coated with PCO Sealant on 9th June.
On 10th June, the graffito had infiltrated through the marble without PCO Sealant coat.
On 10th June, the graffito on the marble coated with PCO Sealant had been decomposed.
d © 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
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Example.2 Surface: Product:
Exterior wall self-cleaning Granite PCO Sealant
Apply Method: Spray Period: 3 months This picture shows a granite wall which is
old and dirty after years of weathering. The area divided by yellow adhesive tape is to be coated. (Photo #1 dated Dec. 14t)
Before PCO Sealant is applied to the
surface, pre-cleaning work is
necessary. The granite wall is washed
and cleaned of deposit stains and
pollutants. If possible, cleaning the
surface with suitable chemical solvent
is recommended. The left part of the
cleaned area was coated. (Photo #2 dated Dec. 14t)
After 3 months weathering, the wall coated shows obvious self-cleaning function. The right part without PCO Sealant becomes dirty and dark under the poor air condition of the metropolis. It will be close to the no cleaned area again after several months.
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
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Example.3 Surface: Product:
Exterior column self-cleaning Granolith PCO Sealant
Apply Method: Spray Period: 102 days
Day1: 40 years’ old granolithic column had been
cleaned with improper strong acidic cleaning
agent. The structure of granolithic covering had
been destroyed; air, dust & pollutants had been
retained on column base after raining as photo
1 dated 2005-7-18. Lower part of the stained
column base would be cleaned & sealed with
PCO Sealant. (Photo #1 dated Jul. 18th 2005)
Day1: Lower part of column base (below the
taped area) had been cleaned with cleansing
agent. Dirt & stain had been removed off the
stained area. PCO Sealant was applied to
the sealed area of column base. (Photo #2 dated Jul. 18th 2005)
Day 36: The unsealed area- upper part of the
column base was found dark & dirty while
the area sealed, (lower part of the column)
was found white & clean. (Photo #3 dated Aug. 25th 2005)
Day 102: The unsealed area became dark as a
result of contamination by air & organic
pollutants. Decomposition of pollutants & self-
cleaning test on granolithic covering works &
succeeds. (Photo #4 dated Oct. 29th 2005)
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Example.4 Surface: Product:
Apply Method: Spray Exterior aluminum self-cleaning
PVDF coated aluminum panel PCO Sealant Period: 5 months
This case is for a PVDF coated aluminum panel, it is new but easy to dirty. After
wash by commercial cleaning agent and water, the left part was coated with PCO
Sealant. This photo is taken at 5 months after coating.
The above photo is treated by monochrome digital photo technology, it can show the
dirty and difference between coated and non-coated part more clearly.
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Example.5 Surface: Product:
Exterior glass self-cleaning & hydrophilic Glass curtain facade PCO Sealant
Apply Method: Spray
The part with PCO Sealant shows hydrophilic feature, and has an
excellent transparent appearance.
d
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Suggested applications of super-hydrophilic technology
Tunnel lighting, Tunnel wall,
Clear soundproof wall
Traffic sign, Lightning, Soundproofed wall, Guardrail,
Decorative laminated panel and Reflector on a read
Road mirror
Cleaning easiness
Materials for a road Self Cleaning by a rainfall
Anti-fogging property
Window, Sash, Curtain wall, Painted steel plate,
Aluminum panel, Tile, Building stone, Crystallized
glass, Glass film
Materials for a tall
building Self Cleaning by rainfall
Self Cleaning by rainfall,
Preventing dewdrops forming Materials for agriculture Plastic and Glass greenhouse
Painting and Coating of vehicles, The outside of
windows, Headlights
The inside of windows, Glass film, Helmet visor
Side view mirror, Rearview mirror and Windshield of
a motorcycle, Side mirror film
Self Cleaning by rainfall
Materials for vehicles Anti-fogging property
Preventing dewdrops forming
Materials for medical
instruments and supplies Bio-compatibility Contact lens, Catheter
Paint All properties mentioned above Paint, Coat
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Tableware, Kitchenware
Spray of anti-fouling coat Spray of anti-fogging coat, Anti-fogging film
Cleaning easiness Daily necessities and
Self Cleaning by rainfall Consumer products
Anti-fogging property
Optical lens Materials for optical
Anti-fogging property instrument
Computer display
Upper glass of a solar cell, Insulator
Heat exchanger of an air conditioner, High-voltage cable
Cleaning easiness
Materials for an electric Self Cleaning by rainfall and electronic instrument
Preventing dewdrops forming
Showcase
Signboard, Fingerpost, Show window, The exterior of a store
Refrigerated showcase
Cleaning easiness
Materials for a store Self Cleaning by rainfall
Anti-fogging property
Parts of a Kitchen, a Bathroom and Interior
furnishings
Exterior tiles, Siding boards, Window, Sash, Screen
door, Gate door, Roof, Sun parlor, Handrail of a
verandah
Mirror of a Bathroom and a Dresser Toilet, Window, Bathroom
Cleaning easiness
Materials for a house Self Cleaning by a rainfall
Anti-fogging property Accelerated drying
Application Division Function
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1. Application OverviewElectrostatic spraying is the recommended application method for applying PCO Sealant. Other
methods include r ol l i ng , dipping and brushing. If you have any questions please contact us at
service@WCTinfo.com.
2. Electrostatic Sprayer Application Method
The electrostatic sprayer method is the most popular & recommended
application method for applying PCO Sealant. The electrostatic sprayer
produces super fine atomized particles that are sprayed onto the surface to
be treated. The electrostatic sprayer deposits a microscopic film of PCO
Sealant. Typical recommended surfaces to apply this method of application
are: Walls, paint surface, marble, granite, building, glass, ceiling, ceramic,
tile, carpet, paper and etc…
3. Rolling & Brushing Application Method
Rolling is a simple & easy method to apply PCO Sealant. PCO Sealant can be rolled or
brushed onto a surface such as a building's exterior wall. Rolling or brushing a coating onto a
surface wiill be more costly as the film will be much thicker and more PCO Sealant could be
used.
The typical objects suggested for this method include:
Walls, paint surfaces, granite, marble, tile, metal and
etc…
4. Dipping Application Method
The dipping method may be used in industrial application or small
subject treatment like bulbs. Dip the subject to be treated into PCO
Sealant directly and dry it under ambient temperature or heat it
below 200 Celsius degree.
Typical subjects suggested to apply this method are: Air filters, water
filters, key parts of air / water purification systems, bulbs,
fabrics, clothes, mops, rags, food containers such as plates, etc…
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
TiO2
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4. Spray Guidance
1. Before spraying
When using unfamiliar equipment or coatings, always test on a small area before treating the entire
surface.
2. Spray pattern
1) Apply PCO Sealant in an over-lapping spray-pattern to ensure an even
coverage of coating.2) The target surface should just barely glisten with the coating. Do not over-saturate the
surface; if you see runs or puddles it means you are wasting PCO Sealant. Check to make
sure the newly-coated surface is very slightly damp.
When you have coated an area by accident, wipe off the solution immediately. It is very
difficult to remove once it has begun to dry.
The optimal spraying distance from the target surface is about 1m (39 inches); a spraying
distance from the target surface of 0.9m to 1.2m (36 to 48 inches) provides the most even
coating. This gives the charged mist space to develop into a chaotic cloud that will be
attracted to the target surface.
Hold the spraygun at right angles to the target surface. Starting at the highest point and using
zig-zag horizontal strokes about 1 meter (3 ft.) wide, apply the PCO Sealant down to the
lowest point. Try to have each stroke overlap the previous stroke by about 50%.
Use vertical strokes if it suits the area better. Just make sure to work in a methodical pattern
and let your strokes overlap.
When moving to the next section, allow it to overlap the previous section by a few
centimeters. Do not leave a gap.
Unlike spray painting, you don’t have to stop the application on every return stroke. Just
engage the trigger lock and concentrate on the regular pattern of coating. Periodically check
to make sure the red light is illuminated on the spraygun.
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5. PCO Sealant Drying
There are two phases in the PCO Sealant protective film forming process, including the primary
drying and the final setting. Primary drying is a procession, by which the PCO Sealant
is preliminarily coagulated by evaporation of the dispersant. After primary drying, the PCO
Sealant is stabilized and can be activated by light.
Drying with heat can effectively lessen the drying time.
Once the PCO Sealant is final set it becomes a solid film which never dissolves.
For approximately two months after the finished application the hardness process will continue until it
reaches a stability of 2H to 5H (equivalent to a pencil lead).
In case of forced drying or heating, it should be conducted below 600°C. When the PCO
Sealant is heated to more than 800°C, the photocatalyst activity is decreased.
If an area is coated by accident, wipe off the excess solution immediately. It is very difficult
to remove the coating after it has dried completely.
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6. Safety Caution
• Refer to Material Safety Data Sheet (MSDS).
• Recommended gear such as gauze facemask and eye protection goggles should be worn during
the installation of PCO Sealant.
© 2011-2013 World Changing Technologies Pte Ltd All rights reserved Tel: (65) 6449 3928 Website: www. W CTinfo.com
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