ETHYL SILICATE

Sanmin wack te 40 is an ethyl silicate providing approximately 41% of silicon dioxide (silica) upon complete hydrolysis.

Sanmin W. te 40 contains many hydrolyzable ethoxy groups. For applications in which the inorganic SiO2 is to be used as a binder, Sanmin wack the 40 needs to be activated.

Hydrolysis of SANMIN Wack TE 40 induced by atmospheric humidity is too slow for most moisture curing applications. It must be activated by : 
- partial acid hydrolysis in an alcoholic co-solvent, for example by sulfuric acid
- catalysis, for example amines or titanates

Sanmin W. TE 40 is used for the precipitation of silica upon complete hydrolysis. The SiO2 coating firmly binds inorganic fillers and pigments and adheres well to different inorganic substrates like glass, ceramics or metall. Chemical and mechanical properties of the substrates can be improved by the thin SiO2 film, which is also highly heat-resistant.

• binder for zinc-rich anti-corrosion paints
• binder for refractory fillers (production of ceramic shells and cores)
• precision casting
• coating material for pigments and fibers
• liquid source of SiO2 as a (film-forming) binder - crosslinking agent, e.g. for silicone elastomers - sol-gel processes

Surface coatings based on ethyl silicate binders are categorised as inorganic coatings, whereas the conventional surface coatings which are mainly based on organic binders are referred to as organic coatings. Zinc-rich inorganic coatings based on ethyl silicate are quite successful for the protection of steel against corrosion under severe exposing conditions such as underground, marine atmosphere, industrial atmosphere, nuclear power plants, etc. These coatings provide unmatched corrosion protection to steel substrates exposed to high temperatures. Because of the formation of conductive matrix out of the binder after film curing, zinc-rich coatings based on ethyl silicate binder offer outstanding cathodic protection to steel structures. These coatings are mostly solvent-borne, but recently water-borne versions of the same have also been developed. However, the commercial success of water-borne systems is not yet well established.

Ethyl silicate (molecular formula: Si (OC2H5) 4) is a colorless liquid with special foul smell. It has the relative density being 0.933, the melting point being-77 ℃, the boiling point being 166.5 ℃, freezing point being-77 ℃, the viscosity being 0.00179Pa • s [0.0179P (20 ℃)] and the refractive index being 1.3837 (20 ℃). It is very stable in the absence of water while it is decomposed into ethanol and silicic acid and becomes cloudy in the moist air while be clarified later and has the silicic acid being precipitated. It is soluble in alcohol, ether and other organic solvents. It is toxic with strong irritation effect on the human eye and respiratory tract. The industry applies the reaction between silicon tetrachloride and anhydrous ethanol and further distillation to obtain ethyl silicate. 

Ethyl silicate is mainly applied to the manufacture of heat resistant and chemical resistant coatings and preparation of organic silicone solvent. It can also be applied to organic synthesis and used as the basic raw material for making advanced crystal, optical glass processing, binders and also the insulation materials of electronics industry.

Ethyl silicate is a kind of liquid silicate and can be used as the dissolving agent of mural painting. Ethyl silicate is a clear, thin liquid which is similar to volatile solvents on the surface. After careful addition of a small amount of alcohol and water, it will be hydrolyzed into the pure silica adhesive. Before drying, it will go through viscous, adhesive intermediate stage. Applying ethyl silicate paint to the surface which is absorbent or permeable can produce a counter effect against frescoes; ethyl silicate pigment has a better performance than frescoes in term of durability and vividness of the color. Pigment must be subject to reformulation every day to be kept being fresh. Once being added with the water, you have no way to stop the hydrolysis reaction. 

Ethyl silicate can be used as an insulating material for electronic industry, paint, zinc coating binders, optical glass treatment agents, coagulants, organic solvents and precision casting silicone adhesive, and the model box for manufacture of metal investment casting method. The completion of the hydrolysis of ethyl silicate produces fine silica powder for the manufacture of phosphors; it can be used in organic synthesis, preparation of soluble silicon, the preparation and regeneration of catalyst; it can also be used as the cross-linking agent and intermediate also for the production of silicone.

It can be used as the adhesive of paint and pigment; also used as the cross-linking agent of silicone rubber; the binder of ceramic materials and accurate casting.

For any query please feel free to contact us.

Michael 

WA +6285894436642 

michael@sanminglobe.com