Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of tetraethyl orthosilicate cas 78-10-4 in China. Welcome to wholesale bulk high quality tetraethyl orthosilicate cas 78-10-4 for sale here from our factory. Good service and reasonable price are available.
Tetraethyl orthosilicate(TOSE), ethyl silicate at room temperature for colorless transparent liquid, has a special odor. It is stable in the absence of water and decomposes into ethanol and silicate in the presence of water. It becomes turbid in the moist air, insoluble in water, soluble in ethanol, and slightly soluble in organic solvents such as benzene and ether. Toxic, strong irritation to human eyes and respiratory tract. It was prepared by distillation after the action of silicon tetrachloride and anhydrous ethanol. It can be used to prepare heat resistant and chemical corrosion resistant coatings and silicone solvents, as well as basic raw materials for organic synthesis, preparation of advanced crystals, optical glass treatment agents, binders, insulation materials for the electronic industry.
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Chemical Formula |
C8H20O4Si |
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Exact Mass |
208.11 |
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Molecular Weight |
208.33 |
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m/z |
208.11 (100.0%), 209.12 (8.7%), 209.11 (5.1%), 210.11 (3.3%) |
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Elemental Analysis |
C, 46.12; H, 9.68; O, 30.72; Si, 13.48 |
Tetraethyl orthosilicate is an important organic silicon compound widely used in various industrial fields. Below is a systematic summary of their applications in the fields of electronics industry, coatings and coatings, precision casting, optical glass processing, organic synthesis and materials science, cultural heritage protection, and other areas.
1. Insulating material
It is mainly used as an insulation material in the electronics industry, and its excellent electrical insulation performance makes it a key material for manufacturing electronic components and integrated circuit packaging. Through the sol gel method, ethyl silicate can form high-purity and low defect silicon dioxide film, which can be used as the passivation layer on the chip surface to prevent the external environment from eroding the chip, and improve the stability and life of the device.
2. Packaging material
In semiconductor packaging, as a precursor, silica gel is generated through hydrolysis condensation reaction to fill the gap between the chip and the packaging body and form a dense protective layer.
This material not only has good insulation properties, but also effectively blocks water vapor and ion migration, improving packaging reliability.
3. High frequency insulation application
With the development of 5G and 6G communication technologies, high-frequency electronic components have higher requirements for the dielectric properties of insulation materials. Ethyl silicate based silica materials have low dielectric constant and low dielectric loss, which can reduce energy loss during signal transmission and are suitable for the manufacturing of high-frequency circuits and microwave devices.
1. Chemical resistant coatings
It is the core raw material for manufacturing acid resistant, alkali resistant, and solvent resistant coatings. The hydrolysis product silica can form a three-dimensional network structure, enhancing the adhesion and chemical stability of the coating. In corrosive environments such as chemical equipment, storage tanks, and pipelines, ethyl silicate based coatings can effectively isolate medium erosion and extend equipment service life.
2. Heat-resistant coating
Traditional coatings are prone to decomposition and failure in high-temperature environments. The silica coating generated through condensation reaction has excellent heat resistance and can withstand high temperatures above 800 ℃ without performance degradation.
This material is widely used for the protection of high-temperature components such as aircraft engines, boilers, and combustion chambers.
2. Anti corrosion coating
In Japan, 90% of ethyl silicate is used to produce corrosion-resistant coatings such as zinc rich paint. Zinc powder reacts with ethyl silicate to form a dense zinc silicon composite film, which not only provides cathodic protection but also prevents the penetration of corrosive media through the barrier effect of silicon dioxide. It is suitable for long-term exposure to humid environments such as marine engineering, bridges, and steel structures.
1. Sand mold binder
In precision casting, as a sand mold binder, silica sand particles are firmly bonded through hydrolysis and condensation reactions to form a high-strength, low gas generation shell. This process can manufacture metal castings with complex shapes and high dimensional accuracy, which are widely used in the production of high-end components such as aircraft engine blades and turbine disks.
Investment casting model box
It can also be used to manufacture model boxes for investment casting. Its hydrolysate silica gel has good fluidity and formability, and can accurately duplicate model details.
After high-temperature sintering, the model box forms a high-purity, low expansion coefficient ceramic shell, providing reliable support for precision casting.
2. Metal surface treatment
Treating metal surfaces with ethyl silicate vapor can form a dense silicon dioxide film, improving the corrosion resistance and wear resistance of the metal. This technology is suitable for surface modification of materials such as stainless steel and aluminum alloy, extending the service life of components.
1. Improved transparency
When ethyl silicate is used to treat optical glass, its hydrolysis product silicon dioxide can fill the microcracks and pores on the glass surface, reduce light scattering, and significantly improve transmittance. The processed glass has a transmittance of over 92% and is suitable for high-precision optical instruments, lenses, display screens, etc.
2. Surface protection
Tetraethyl orthosilicate thin films have good chemical stability and mechanical strength, which can protect optical glass from scratches, corrosion, and contamination.
In high-end fields such as lasers and fiber optic communication, processing technology can effectively improve the reliability and service life of devices.
3. Anti reflective coating
Multi layer anti reflective coatings can be prepared by controlling the hydrolysis conditions of ethyl silicate. This coating utilizes the principle of light interference to reduce the reflected light on the glass surface and improve the transmittance efficiency. In fields such as solar cells and displays, anti reflective coatings can significantly improve the photoelectric conversion efficiency of devices.
1. Organic silicon solvent
It is an important intermediate in the synthesis of organosilicon, and various organosilicon compounds can be prepared through hydrolysis and condensation reactions, such as silicone oil, silicone rubber, silicone resin, etc. These materials have excellent properties such as high and low temperature resistance, electrical insulation, and ozone resistance, and are widely used in fields such as electronics, electrical engineering, construction, and automobiles.
2. Fluorescent powder manufacturing
The extremely fine silica powder produced after complete hydrolysis of ethyl silicate is a key raw material for manufacturing fluorescent powders. Silicon oxide, as a matrix material, can be doped with rare earth elements to form efficient luminescent centers. This fluorescent powder is suitable for lighting and display devices such as LEDs, fluorescent lamps, and displays.
3. Catalyst preparation and regeneration
It can be used as a catalyst carrier or precursor to prepare efficient catalysts by loading active components. For example, in the petrochemical industry, ethyl silicate based silica supports can improve the thermal stability and carbon deposition resistance of catalysts, extending their service life.
4. Biodegradable materials
In recent years, great potential has been demonstrated in the field of biodegradable materials. Through polymerization reaction, new materials such as polyhydroxyethyl silicate fibers can be prepared, which have the functions of drying, moisturizing, self-cleaning and degradation, and are suitable for medical dressings, environmentally friendly packaging and other fields.
1. Mural pigment dissolving agent
It can be used as a dissolver of mural paint. Its hydrolysate silica gel can penetrate into the paint layer to form a stable support structure and prevent the paint from falling off. This technology is suitable for the restoration and protection of ancient murals and cultural relics.
2. Durability improvement
Applying ethyl silicate pigment to an absorbent or permeable surface can create an effect that can compete with wet wall paintings. Its durability and color clarity surpass traditional frescoes, providing a new solution for cultural relic protection.
Other fields: Continuous expansion of diversified applications
1. Thermal insulation material
Fiber reinforced silica aerogel composites were prepared from ethyl silicate by sol-gel method and supercritical drying process. This material has an extremely low thermal conductivity and is suitable for insulation needs in fields such as aerospace and building energy conservation.
2. Flame retardant material
High efficiency flame retardant coatings can be prepared by compounding with epoxy resin, nano silica, and other materials. This coating can form a dense carbon layer at high temperatures, preventing the spread of flames, and is suitable for fire prevention treatment of flammable materials such as cables and textiles.
3. Hydrophobic and hydrophilic materials
Hydrophobically modified fiber reinforced SiC/SiO ₂ composite aerogel powder can be prepared by adjusting the pH value of ethyl silicate aqueous solution and adding a surface modifier. This material has both hydrophobic and hydrophilic properties, making it suitable for self-cleaning coatings, oil-water separation, and other fields.
We are the supplier of Tetraethyl Orthosilicate.
Remark: BLOOM TECH(Since 2008), ACHIEVE CHEM-TECH is the subsidiary of us.
The preparation process of ethyl silicate includes the following preparation processes:
(1) First, add the metered crude silicon tetrachloride and active metal catalyst into the reactor to add the ethanol solution into the high-level tank.
(2) Under a constant vacuum degree, gradually add Z alcohol to the reaction kettle, and then react quickly. Adjust the reaction speed by controlling the amount of ethanol added: slowly raise the temperature of the reaction kettle after all ethanol is added. HC1 produced during the reflux reaction is absorbed by water to produce by-product hydrochloric acid. After reflux for about 0.5-1 hour, the unreacted ethanol is heated and evaporated.
(3) After the reaction, cool to room temperature and remove the Z-alcohol by activated carbon decolorization distillation to collect the fraction at 160-180 ° C.
The detailed steps for the synthesis of ethyl silicate are as follows:
1, Prepare raw materials
Coarse silicon tetrachloride: This is the main reaction raw material and its purity needs to be ensured.
Active metal catalysts, such as aluminum, zinc, etc., are used to accelerate reactions.
Ethanol: used as a reaction solvent and reactant.
Water: used to absorb HCl produced in the reaction.
Activated carbon: used for decolorization and removal of impurities.
The detailed steps are as follows:
(1) Add the measured crude silicon tetrachloride and active metal catalyst to the reaction vessel and stir evenly.
(2) Add the ethanol solution to the high-level tank to ensure the concentration and purity of ethanol.
(3) Under a constant vacuum, gradually add the ethanol solution to the reactor while maintaining stirring. The addition rate of ethanol should be controlled appropriately to maintain a smooth reaction.
(4) After all ethanol is added, the mixture in the reactor begins to react rapidly. At this point, the reaction rate can be adjusted by controlling the temperature and stirring speed.
(5) As the reaction proceeds, the HCl gas produced is absorbed by water, producing a byproduct hydrochloric acid. Pay attention to timely drainage and keep the reaction system dry.
(6) After reflux reaction for about 0.5-1 hour, the unreacted ethanol is evaporated by heating to reduce the humidity of the system and improve the purity of ethyl silicate.
(7) After evaporation, cool to room temperature, and then remove Z-alcohols and other impurities through decolorization distillation using activated carbon. Pay attention to the amount of activated carbon and the decolorization temperature to ensure the purity of ethyl silicate.
(8) Finally, collect the fraction at 160-180 ℃, which is the product of ethyl silicate. Pay attention to controlling the temperature range of the fraction to ensure the purity of the product.
This synthesis method involves multiple chemical reactions, among which the following are several main chemical equations:
Reaction between silicon tetrachloride and ethanol:
SiCl4 + 2CH3CH2OH → Si(OC2H5)4 + 2HCl
The role of catalysts:
Metal catalysts such as Al and Zn can react with silicon tetrachloride to generate corresponding chlorides and ethyl silicate.
The generation of by-product hydrochloric acid:
H2O + HCl → HCl (aq)
Activated carbon decolorization distillation:
Activated carbon has adsorption properties, which can remove Z-alcohols and other impurities, and improve the purity of ethyl silicate. During the decolorization distillation process, tetraethyl orthosilicate is separated from other impurities.
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