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