Microbecide PCO Sealant Overviewmicrobecide.com/Reports/PCO_Sealant_Overview.pdf · Microbecide PCO Sealant Overview Microbecide PCO (Photocatalyic Oxidation) Sealant is a custom

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.

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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.


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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


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.


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 ● ●

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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

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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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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.


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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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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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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


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


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


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

[email protected].

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…


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.

3)

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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.


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Documents

Microbecide PCO Sealant Overviewmicrobecide.com/Reports/PCO_Sealant_Overview.pdf · Microbecide PCO Sealant Overview Microbecide PCO (Photocatalyic Oxidation) Sealant is a custom