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Photocatalyst self-cleaning nano-coating
About us
Sunlight Eco-tech Limited is a company that
provides customers with energy conversion systems and
solutions to improve energy efficiency. We offer clean
energy such as solar power generation, energy-saving
products making use of Photocatalyst self-cleaning
nano-coating technology, smart grids and green efficient
transportation.
Our goal is to make the most using the least:
To increase energy efficiency without increasing
cost. Making use of less resources and cause the least
damage in exchange for more energy supply and
efficiency.
Introduce to nanophotocatalyst
Photocatalyst is a general term for photocatalytic
photo-semiconductor materials represented by nano-
sized titanium dioxide. It is coated on the surface of the
substrate and generates strong catalytic degradation
under the action of ultraviolet light. It can effectively
degrade the toxic in the air. Harmful gas; it also has
super-hydrophilic properties. Spraying on the glass
surface can keep the glass clean and transparent for a
long time.
Nanophotocatalyst principleUnder the irradiation of light, nano-TiO2 will produce photocatalytic reaction similar to photosynthesis, producing free
hydroxyl groups and active oxygen with strong oxidizing ability. It has strong photo-oxidation and reduction function, and can
oxidize and decompose various organic compounds and parts. Inorganic substances, which can destroy bacterial cell membranes and
proteins that cure viruses, can kill bacteria and decompose organic pollutants, and decompose organic pollutants into non-
polluting water (H2O) and carbon dioxide (CO2), thus having strong sterilization and elimination. Stinky, anti-mildew, anti-
fouling and self-cleaning, purifying air function.
The photocatalyst is characterized in that the oxygen molecules and water molecules in the air are used to convert the
organic matter in contact with carbon dioxide and water, and the material that can not be changed by itself, but can promote
chemical reaction, is theoretically valid for a long period of time and has low maintenance cost. At the same time, titanium
dioxide itself is non-toxic and harmless. It is the safest and cleanest environmental purification material in the world. It is
widely used in the world
Sterilizing UV lamp
Photocatalyst absorbs ultraviolet light
Nano titanium dioxide photocatalyst
Bacterias and viruses being destroyed by OH
Bacteria, viruses and organic pollutants/allergens are broken down
carbon dioxide
Eventually decomposed into pollution-free water vapor and carbon dioxide
Germs, viruses and organic pollutants
Features and advantages
1. TiO2 is an environmentally friendly product.
It is a water-based coating. It has a volatile
organic pollutant content of less than 3g/L
and does not contain any heavy metals. It is
non-toxic and harmless and safe and reliable
for human body.
2. High dispersion of nanoparticles with an
average particle size of 5 nm
3. Under the photocatalysis, it can effectively
kill a variety of bacteria, the antibacterial rate
is as high as 99%, and can decompose and
harmlessly treat the toxins released by
bacteria or fungi; at the same time, it also
has the functions of deodorization and anti-
fouling.
CategoryVolatile organic
compounds
Microorganisms Deodor Smell Toxicity
Active charcoal
Moderate effect
No effectModerate effect
No smell Non-toxic
Air freshener
No use No useCovers
the smellArtificial
smellLow
toxicity
Formaldehyde trapping agent
Only works on formaldehyde
No use
Only works on removing the
smell of formaldehyde
SmellyLow
toxicity
Bactericide No use Effective No use SmellyRelatively
toxic
Ultra violet light (Orange) No use Effective No use No smell
Improper use can cause cancer
Oxygen anion
No use No useFresh smell but doesn’t last long
No smell Non-toxic
OzoneModerate effect
Effective when concentration is
>0.1ppmNo use
Smelly when concentration is
>0.15ppm
Long term use can cause cancer
Plant absorption
Little effect
No useModerate effect
Smells good Non-toxic
(TiO2)Decoposed
and removedKills 99% of
bacteriaStrong
deodorantNo smell Non-toxic
Comparison between our Production and other traditional air refreshers
Applications: Indoor, in-vehicle disinfection, formaldehyde removal
When the nano-sized titanium dioxide ultrafine particles are irradiated with ultraviolet light having a wavelength of 388 nm or less, the inside thereof is excited by the absorption of light energy to generate electron-hole pairs, that is, photo-generated carriers. Then it rapidly migrates to the surface thereof to activate the adsorbed oxygen and Moisture produces active free hydroxyl (.OH) and reactive oxygen (O), and when the contaminants and bacteria adsorb to their surface, chain degradation occurs.
Superhydrophilic principle
Super-hydrophilic means that water falls on the
surface of the material, and the contact angle of the
water droplets is less than 10°. From the appearance,
water does not form water droplets on the surface of
the material but water film. In addition, the super-
hydrophilic material has a much higher affinity with
water than with dust. Other dirty affinity, so in the
c a s e o f r a i n o r w a t e r f l u s h i n g , i t w i l l
preferentially combine with water, so that water can
penetrate under the dirt and separate the dirt from
the super-hydrophilic self-cleaning coating. In
addition, TiO2 itself has a photocatalytic effect,
which can effectively degrade the dirt, and is
especially suitable for the glass curtain wall of the
building.
Super-hydrophilic means that water falls on the surface of the material, and the contact angle of the water droplets is less than
10°. From the appearance, water does not form water droplets on the surface of the material but water film. In addition, the super-
hydrophilic material has a much higher affinity with water than with dust. Other dirty affinity, so in the case of rain or water flushing, it will
preferentially combine with water, so that water can penetrate under the dirt and separate the dirt from the super-hydrophilic self-
cleaning coating. In addition, TiO2 itself has a photocatalytic effect, which can effectively degrade the dirt, and is especially suitable for
the glass curtain wall of the building.
Superhydrophilic principle
Superhydrophilic θ(Contact angle)<10°
Features and advantages:
1. This is an environmentally friendly product. It is a water-based coating with less than 3g/L volatile organic pollutants and no heavy metals. It is non-toxic and harmless. It is safe and reliable for human body.
2. Excellent super-hydrophilic properties: contact angle <3°.
3. High dispersion of nanoparticles with an average particle size of 5 nm.
4. High transmittance: over 98% in the visible region.
5. Durable: Hardness is 8H; the nano-film can last up to 20 years after being tempered with glass.
Application range: increase the self-cleaning effect of photovoltaic panels
Dust Effect Outcome
Dust depositionTransmission rate
Efficiency Dust sizeAmount of sunlight received
Deposition thickness
Influence of dust on power generation efficiency of PV panels Traditional ways of cleaning PV panels
Comparison of PV modules coated with self-cleaning coatings and PV modules without self-cleaning coatings after two months of outdoor
In conclusion: Coated PV is 5% to 15% more efficient than uncoated PVThe coated PV surface does not turn yellow, which proves that the quality life is longer than that of the uncoated PV.
Coated PV panel Not coated
Application range: Increase the self-cleaning effect of photovoltaic panels
Outdoor glass curtain walls
need to be cleaned regularly. The
tradi t ional c leaning method is
usually manual cleaning. It not only
consumes a lot of manpower and
material resources, but also has
great hidden dangers in terms of
safety.
Applications: Glass curtain wall (super-hydrophilic properties)
With PolyU self-cleaning coating塗抹了理大自清潔塗料
Without PolyU self-cleaning coating沒有塗抹了理大自清潔塗料
Applications: Glass curtain wall (super-hydrophilic properties)
Finger imprint
Without self-cleaning coating With self-cleaning coating
Imprint removed
AFTER A DAY OF ILLUMINATION, THE FINGERPRINT OIL IS COMPLETELY DECOMPOSED
Our TiO2 coating Traditional automatic cleaning coating
CostLess than HKD12/m2 Less than HKD80 -
160/m2
Life-span 20 years 20 years
Production method
Factory (screen printing) / finished goods (spraying)
Can only be produced in factory
Production process
SimpleComplicated
Applications Solar photovoltaic, glass, aluminum, stainless steel
Glass, aluminum, stainless steel
Our TiO2 coating vs traditional automatic cleaning coating
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