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Tetramethyl orthosilicate is a colorless and transparent liquid with a unique odor that is easily hygroscopic. Molecular formula C4H12O4Si, CAS 681-84-5, insoluble in water, miscible with most organic solvents. Slightly soluble in benzene, ethanol, and ether. It is unstable in the presence of water and gradually decomposes into silicon oxide in the air. It is freely miscible with organic solvents and insoluble in water. Flammable. Toxic. Corrosion. It is one of the hazardous chemicals. If it is water, it will decompose into viscous silica. If there is an open flame, high temperature, or contact with oxidants, it can cause combustion. After heating, it will decompose into toxic gases, which have a strong irritant effect on the respiratory tract and eyes. Used for producing heat-resistant and chemically resistant coatings, organic silicon solvents, and adhesives for precision casting. It is also a widely used organic synthesis intermediate.
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Chemical Formula |
C4H12O4Si |
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Exact Mass |
152 |
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Molecular Weight |
152 |
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m/z |
152 (100.0%), 153 (5.1%), 153 (4.3%), 154 (3.3%) |
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Elemental Analysis |
C, 31.56; H, 7.95; O, 42.04; Si, 18.45 |
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Tetramethyl orthosilicate is an important silicon compound widely used in organic synthesis, coatings, glass, ceramics, and other fields. The specific steps are as follows:
The chemical equation for the reaction between sodium silicate and sulfuric acid to produce tetramethylsilicate oxygen and sodium sulfate is:
Na2SiO3 + H2SO4 → Na2SO4 + Si(CH3)4
In a dry reactor, add a certain amount of sodium silicate (Na2SiO3) and methanol. Ensure that sodium silicate is completely dissolved in methanol.
Slowly add a certain amount of sulfuric acid as a catalyst. Pay attention to controlling the rate of sulfuric acid addition to avoid excessive reaction.
Heat the reaction mixture to a certain temperature and maintain a constant temperature. This temperature should be sufficient to trigger the reaction, but it will not lead to the occurrence of other side reactions.
During the heating process, sodium silicate reacts with sulfuric acid to produce sodium sulfate and tetramethylsilicate oxygen. This reaction is reversible and the reaction equilibrium can be adjusted by controlling the reaction conditions (such as temperature and time).
After the reaction is completed, cool the reaction mixture to room temperature.
Separate the generated tetramethylsilicate oxygen through methods such as filtration or centrifugation.
Perform purity testing and property analysis on the separated products to ensure that the obtained products meet the requirements.
When synthesizing tetramethylsilicate oxygen in the laboratory, the following points need to be noted:
The purity of raw materials has a significant impact on the quality and yield of products, so it is necessary to ensure that the sodium silicate, methanol, and sulfuric acid used are all of high purity.
The reaction temperature and time are important factors affecting the reaction equilibrium, so it is necessary to control the heating rate and reaction time to obtain the best yield and purity.
Filtering and separation are key steps in obtaining high-purity products, so it is necessary to choose appropriate filtering methods and separation equipment to avoid product contamination and loss.
Another method for synthesizing tetramethylsilicate oxygen is to prepare tetramethylsilicate oxygen by reacting silane alcohol with alcohol.
The reaction equation between silane alcohol and alcohol:
R1R2SiOH + R3R4OH → R1R2Si(OR3) + OR4H
Among them, R1, R2, R3, R4 are organic groups, which can be alkyl, aryl, etc.
The hydrolysis reaction equation of tetramethylsilicate ester:
(CH3)4Si (OR3) → (CH3)4SiO + R3OH
Preparation of raw materials: Silanol, alcohol, catalyst (such as sulfuric acid or hydrochloric acid).
Mix silane alcohol with alcohol to ensure complete dissolution of silane alcohol in the alcohol.
Slowly add the catalyst and stir evenly.
React the reaction mixture at a certain temperature and pressure. During the reaction process, the hydroxyl group of silane alcohol undergoes esterification reaction with the alcohol to produce tetramethylsilicate ester.
Distill the reaction mixture to separate tetramethylsilicate ester.
The hydrolysis reaction of tetramethylsilicate ester yields tetramethylsilicate oxygen.
Tetramethyl orthosilicate (TMOS), with the chemical formula Si (OCH ∝) ₄, is a colorless and transparent liquid with an ester aroma, but it rapidly hydrolyzes and crosslinks when exposed to humid environments. As a key raw material in the field of organosilicon, the four hydrolyzable methoxysilane groups in its molecular structure endow it with unique reactivity, making it an irreplaceable "invisible champion" in high-tech fields such as high-temperature materials, electronic packaging, new energy, and building protection.
1. Aerospace and high-temperature materials
High temperature resistant coating: A composite material formed by the combination of TMOS and phenolic resin, which can withstand temperatures above 1000 ℃ and is widely used in extreme environments such as rocket engine nozzles and spacecraft insulation layers. For example, after using TMOS based coating on the outer shell of a certain type of spacecraft, the surface temperature decreased by 40% and the thermal protection efficiency increased by 60% in simulated space radiation experiments.
Ceramic precursor material: As a synthetic precursor for high-temperature silicate ceramics, TMOS decomposes at high temperatures to form a silica network structure, endowing ceramic materials with excellent mechanical strength and chemical stability. The ceramic components prepared have been used in key components such as aircraft engine turbine blades and nuclear reactor control rods.
2. Electronic, Electrical, and Semiconductor Packaging
Epoxy encapsulation modification: In semiconductor packaging, adding TMOS can reduce the water absorption rate of epoxy resin by 66% and improve its heat shock resistance. A certain chip manufacturer has increased the packaging yield rate from 91.8% to 98.5% by optimizing the TMOS content, saving over 10 million yuan in annual costs.
Chemical Vapor Deposition (CVD) process: TMOS serves as a silicon source and decomposes into amorphous silicon dioxide thin films during the CVD process, which are used to manufacture integrated circuit isolation layers, photoresist protective layers, etc. However, domestic 9N level electronic grade TMOS still relies on imports, resulting in a gap of 8.2% in the yield rate of domestic semiconductor equipment.
3. In the field of new energy
Lithium battery separator coating: Nano silica particles generated by tetramethyl orthosilicate hydrolysis can be uniformly coated on the surface of the separator, forming a dense porous structure. Experimental data shows that the thermal shrinkage rate of the membrane coated with TMOS is less than 1% at 250 ℃, while the untreated membrane has a shrinkage rate of 35%, significantly improving battery safety.
Photovoltaic film anti reflection: Introducing TMOS based nanomaterials into the encapsulation film of photovoltaic modules can increase solar transmittance by 2.3% and increase the annual power generation of a single module by about 15 degrees.
Emerging application scenarios: the "technological link" for cross industry innovation
1. Building Protection and Materials Science
Concrete anti-corrosion enhancement: The protective coating formed by the combination of TMOS and silicate solution can penetrate into the interior of concrete by more than 10mm, forming a dense silica network structure. In coastal corrosive environments, the service life of concrete structures treated with TMOS is extended to 30 years, which is three times that of traditional materials.
Aerogel thermal insulation material: the silica aerogel prepared by the sol gel method with TMOS as the silicon source has a thermal conductivity as low as 0.012W/(m · K), which is only 1/3 of the polystyrene board. The insulation board made of it has been applied in scenarios such as Arctic scientific research stations and ultra-low temperature cold storage.
2. Biomedical and tissue engineering
Bioactive glass: A bioactive glass prepared by high-temperature sintering of TMOS mixed with calcium salts and phosphates, which can promote bone cell adhesion and proliferation. Animal experiments have shown that the bone defect model implanted with TMOS based glass scaffolds can generate 40% more new bone within 4 weeks compared to traditional materials.
Drug controlled release carrier: mesoporous silica nanoparticles prepared by TMOS hydrolysis condensation reaction, with a specific surface area of 1000m ²/g, can load chemotherapy drug doxorubicin and achieve pH responsive release. Preclinical studies have confirmed that its tumor suppressive effect is 2.8 times higher than that of free drugs.
3. Consumer Electronics and Smart Materials
Flexible display packaging: TMOS based inorganic organic hybrid material, with high light transmittance (>92%) and low bending modulus (<1GPa), can meet the strict requirements of foldable screen phones for packaging layers. After using this material in the latest folding machine of a certain brand, the screen bending life has exceeded 500000 times.
Self repairing coating: By introducing dynamic covalent bonds, TMOS derivatives can be used to prepare coatings with scratch self-healing function. In simulated daily wear tests, scratches on the coating surface can completely disappear within 30 minutes, with a recovery rate of 98%.
1. Green synthesis process
Optimization of catalytic system: Traditional TMOS synthesis uses silicon tetrachloride method, which generates a large amount of HCl waste gas. The new molecular sieve catalyst can achieve direct esterification of methanol and silicon powder, with an atomic utilization rate increased to 95% and a reduction of 80% in exhaust emissions.
Closed loop recycling technology: A "hydrolysis regeneration" cycle system has been developed to address the irreversible hydrolysis characteristics of TMOS. By controlling the reaction conditions, the recovery rate of silicon element in the waste liquid can be increased to 90%, and the cost per ton of product can be reduced by 2000 yuan.
2. Development of high-performance materials
Gradient functional materials: By utilizing the copolymerization reaction of TMOS and organosilicon monomers, gradient materials with continuously changing thermal expansion coefficients can be prepared. This material has been used in spacecraft thermal protection systems, effectively solving the cracking problem caused by thermal stress in traditional materials.
3D Printing Resin: By regulating the hydrolysis rate of TMOS, a UV curable resin specifically designed for 3D printing has been developed. Its printing accuracy reaches 20 μ m, which can be used to manufacture high-precision devices such as microfluidic chips and optical lenses.
3. Interdisciplinary integration and innovation
Quantum dot encapsulation: Tetramethyl orthosilicate based silicon dioxide shell can effectively passivate surface defects of quantum dots, increasing fluorescence quantum yield to 85%. This technology has been applied to Mini LED backlight modules, with a color gamut coverage rate exceeding 120% of NTSC.
Neural interface material: TMOS derivatives are combined with conductive polymers to prepare a neural electrode coating that combines biocompatibility and conductivity. In primate experiments, the coating can stably record neural signals for more than 6 months, providing key material support for brain computer interface technology.
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