Self-cleaning Glass
Source:     Author: bathroom-02    Publish time: 2013-11-08 17:58    269 Views
Self-cleaning glass is one kind of high light transmittance glass.

Self-cleaning glass is one kind of high light transmittance glass. The product adopts on line high temperature pyrolytic spraying process, spray thin film onto float glass surface. It is one kind of hydrophilic nano-structure film with photo catalytic activity. The product is of such as but not limited to: hydrophilicity, anti-mould, deodorization, degradation of organic dirt and harmful gas, purifying air. The above function can even be realized under low intensity ultra-violet ray, and the functions are all permanent.


Performance Features :
Hydrophilicity
Long term of photocatalysis:The photocatalysis of self-cleaning film can last long. It can show strong photocatalyzing effect under weak ultra-violet ray. Also works even on cloudy days or during the night.
Keep the same light transmittance of substrate sheet:The coating film has perfect visible light transmittance, the light transmittance of self-cleaning glass is the same as substrate sheet. It can keep eyeshot clear and bright.
Low visible light reflectance: The product has low visible light reflectance, normally it is 10%, sometimes it is lower than 8%.
Super long lifetime:The product can bear artificial aging, anti-alkali and anti-acid, anti-humid and heat circulation, anti-abrasion, the lifetime of it can last over 15 years. It lasts the lifetime of the glazing itself at normal conditions.
Low haze value:The haze value can be kept lower than 0.8%, the coating glass can be kept as clear as substrate.


Applicable Range:
Architecture glazing, curtain walls,Day lighting,Rearview mirror,Protection shell of solar battery,bathroom.


Self-cleaning glass is a specific type of glass with a surface which keeps itself free of dirt and grime through photocatalytic decomposition. A nanometer-scale coating of titanium dioxide on the outer surface of the glass introduces two mechanisms which give it the self-cleaning property. Harsh chemicals that are used to clean normal glass are usually washed off into the soil and contaminate it. The use of self cleaning glass eliminates this environmental hazard.


Dual Process


Self cleaning glass cleans itself in two stages. The first stage is called photo-catalysis which is the action of light on the surface of the glass to basically chomp away or eat the dirt on the surface. The next is a process known as hydrophilicity. This basically ensures that any water that falls on the surface forms sheets and washes away dirt uniformly. The glass spreads the water evenly over its surface, without forming droplets.


Working process of the Self Cleaning Glass


Self Cleaning Glass has a coating of titanium dioxide on its outer surface. Titanium dioxide is an inorganic pigment which is widely used in a several products: everything from sunscreen where it reflects away some of the sun’s UV rays through to toothpaste through to the whitener responsible for the white colour in white paint or even in paper.


Titanium dioxide is present as a very thin coating on the outside surface of the glass. It has a thickness of about 25mm. The action of sunlight on the titanium dioxide generates a species known as electrons and holes. These electrons and holes, along with a specific property of titanium dioxide migrate to the surface and start a process known as oxidation of any organic material which is present. Effectively, the titanium dioxide absorbs the UV component of sunlight and causes the degradation and break-down of any organic material, dust or debris which are on the surface of the glass – It converts them into carbon dioxide and water. One of the best features of this is that it works on the bottom of the dirt outwards and so loosens the dirt on the material coating by destroying the contact layer of the dirt and the glass.


Any rain water impacting the surface will form a very smooth sheet which washes down foreign particles uniformly. This happens through the action of sunlight on titanium that produces a surface which is highly hydrophilic, or water-loving. Water loves wetting the surface and the action of sunlight generates hydroxyl species on the surface effectively.


Everything that settles on self cleaning glass is washed down at the same rate, but this property primarily works on surfaces which have some form of slant. If the surface is perfectly horizontal then it would struggle because of a lack of gradient for the water to run off.


Only a small amount of sunlight is required to activate the coating, which ensures that self-cleaning property will function even on cloudy days. A simple rinse with water during dry spells will help keep the surface clean.


Performance


The performance of self-cleaning glass can vary depending on the environment and the location of the glass. The other factors in play are:


1. The type of dirt


2. The amount of dirt


3. Total exposure to light and rain


4. The incline of the installation


Optimum performance is obtained when the glass is installed in a vertical position, and receives maximum exposure to direct sunshine and rain.


Applications


Self cleaning glass is very effective in highly polluted areas. The areas of its application are as follows:


• Glazed facades, exterior shop fronts, displaywindows, overhead & atria glazing


• Conservatories,balconies, overhead glazing


• Windows & patio doors


Advantages


1. Less frequent cleaning – facade stays cleaner for longer


2. Much easier cleaning – less dirt and grime adheres to the glass


3. Save money – the cost of facade cleaning is reduced


4. Clear vision through the facade – even when it is raining


5. Neutrality and transparency is the same as that of normal glass


6. Less frequent use of detergents – saves the environment


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