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Although Organosilane might seem like a confusing compound, it is actually quite
useful in many different situations. First of all, it is used in mixtures with
hydrogen peroxide. When the peroxide is mixed with an Organosilane quaternary
compound in an aqueous formulation, the mixture can be used to improve the way
that water and soil can be repelled from surfaces. This creates a coating
composition that is at the same time used for cleaning, as well as other
multifunctional coating purposes. Because of the unique properties that
Organosilanes have, they can repel water, dirt, and other substances away from
the item that they coat. Therefore, a mixture of Organosilane and hydrogen
peroxide can be applied to an item, and it will give the item a protective
coating that cannot be penetrated. There are many different surfaces that
benefit from being coated with the Organosilane mixture. These surfaces include
metal, plastic, glass, rubber, ceramic, porcelain, marble, cement, granite,
tile, silica, sand, appliances that have been enameled, polyester, polyurethane,
polyacrylic, resins that are melamine or phenoilic, siliceous, polycarbonate,
and wood, as well as painted surfaces. This is an incomplete list, as there are
many different surfaces that can benefit from being coated with the Organosilane
that is now used in many different situations.
(http://www.articlesbase.com/)
There
are many uses for Siloxane; all of this proves to be quite useful for the common
person. Siloxane, most of the time, is used in many different products like
cosmetics, deodorants, and defoamers. These are three of the main types of
products that contain Siloxane, and the Siloxane in them is used there because
of its natural bonding properties. There are also Siloxane components that are
found in products that repel water, such as those that coat windshields. Also,
Siloxane is found in food additives, and can be found in some soaps as well
.Therefore, Siloxane is something that is found in many different types of
products, occurring all over the
world. (http://www.articlesbase.com/)
Often
the silane is subjected to hydrolysis prior to the surface
treatment. Following hydrolysis, a reactive silanol
group is formed, which can condense with other silanol
groups, for example, those on the surface of siliceous
fillers, to form siloxane linkages. Stable condensation
products are also formed with other oxides such as those
of aluminum, zirconium, tin, titanium, and nickel. Less
stable bonds are formed with oxides of boron, iron,
and carbon. Alkali metal oxides and carbonate do not
form stable bonds with Si-O. Sufficient water for hydrolysis
may be available from atmospheric moisture, or on the
substrate surface. In some cases, it may be necessary
to add water to increase the degree of hydrolysis. The
most straightforward method of silylating a surface
with silane is from an alcohol solution. A two percent
silane solution can be prepared in the alcohol of choice
(methanol, ethanol, and isopropanol are typical choices).
The solution can be wiped, dipped, or sprayed onto the
surface. When dipping a large object, e.g., glass plates,
allow one to two minutes of submersion to allow silane
migration to the surface. After the surface dries, excess
material can be gently wiped, or briefly (alcohol) rinsed
off. Particles, e.g., pigments and fillers, can be silylated
by stirring them in a solution for two to three minutes
and then decanting the solution. The particles can then
be rinsed with alcohol. Cure of the silane layer is
for 5-10 min at 110°C or for 24 hr at ambient conditions.
There are three basic methods of utilizing silanes in
a coatings application: (1) surface treatment, which
includes particle (i.e.,pigments and fillers) treatment
formulated into primers, and water repellents; (2) additive
into paints, inks, and adhesives; and (3) reactive intermediate
for silicone resin synthesis and organic resin modification.
Each of these methods requires special consideration.(http://www.dowcorning.com/)
Silane applications include:
- Adhesion
Promoter
- Catalyst
- Coupling Agent
- Crosslinking Agent
- Curing Agent
- Dispersing
Agent
- Hydrophobic additive
- Hydrophobic surface treatment
- Moisture Scavenger
- Organosilicone intermediate
- Polyurethane Endcapper
- Reinforcer
- Silyl Building Blocks and Synthons
- Silylating
Agent
- Thermal
Stabilizer
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