18001-60-0

Basic information

• Product Name: 1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE
• Synonyms: 1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE;Tetraethoxydimethyldisiloxa;Disiloxane, 1,1,3,3-tetraethoxy-1,3-dimethyl-;1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE 95%;1,1,3,3-Tetraethoxy-1,3-dimethylpropanedisiloxane;1,3-Dimethyl-1,1,3,3-tetraethoxypropanedisiloxane
• CAS NO: 18001-60-0
• Molecular Formula: C₁₀H₂₆O₅Si₂
• Molecular Weight: 282.48
• EINECS: 241-915-7
• Mol File: 18001-60-0.mol
• Article Data: 7

Chemical Properties

• Boiling Point: 205 °C
• Flash Point: 58°C
• Appearance: /
• Density: 0.953
• Vapor Pressure: 0.117mmHg at 25°C
• Refractive Index: 1.3912
• CAS DataBase Reference: 1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE(18001-60-0)
• EPA Substance Registry System: 1,1,3,3-TETRAETHOXY-1,3-DIMETHYLDISILOXANE(18001-60-0)

Safety Data

• Statements: 36/37/38
• Safety Statements: 26-36/37/39
• RIDADR: 1993
• TSCA: No
• Hazardous Substances Data: 18001-60-0(Hazardous Substances Data)

Usage

General Description

1,1,3,3-Tetraethoxy-1,3-dimethyldisiloxane, also known as Siloxanes and Silicones, is a chemical compound comprised of the elements silicon, oxygen, carbon, and hydrogen. This clear, colorless liquid is primarily used as a reagent, or compound used in chemical reactions, in the production of siloxane polymers. Siloxane polymers can have a wide variety of applications including sealants, adhesives, lubricants, and biomedical devices. 1,1,3,3-Tetraethoxy-1,3-dimethyldisiloxane is appreciated for its unique physical and chemical properties such as its thermal stability, flexibility and low toxicity. However, exposure in large quantities can be harmful to the eyes and skin, and can also potentially cause respiratory problems.

InChI:InChI=1/C10H26O5Si2/c1-7-11-16(5,12-8-2)15-17(6,13-9-3)14-10-4/h7-10H2,1-6H3

Upstream product

• 2031-67-6 Methyltriethoxysilan 
• 75-79-6 Methyltrichlorosilane 
• 124-38-9 carbon dioxide 
• 127177-29-1 sodium diethoxy(methyl)silanolate 
• 2031-62-1 diethoxymethylane 
• 64-17-5 ethanol 
• 220289-00-9 1,1,3,3-tetraisocyanato-1,3-dimethyldisiloxane 
• 107-46-0 Hexamethyldisiloxane 

Downstream Products

• 2031-67-6 Methyltriethoxysilan 

Relevant articles and documents

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Syntheses and properties of isocyanatodisiloxanes and their alkoxy- substituted derivatives

Isocyanatooligosiloxanes and their alkoxy derivatives were synthesized. The hydrolysis of triisocyanato(methyl)silane followed by distillation provided 1,1,3,3-tetraisocyanato-1,3-dimethyldisiloxane in good yield. The reaction of 1,1, 3,3-tetraisocyanato-1,3-dimethyldisiloxane with ethanol, isopropyl alcohol, and t-butyl alcohol proceeded selectively to afford partially alkoxy substituted isocyanatodimethyldisiloxanes, (RO)n(NCO)(4- n)Me2Si2O (R = Et, n = 1 - 4; R = Pr(i), n = 1 - 4; and R = Bu(t), n = 1 - 2). On the other hand, the hydrolysis of tetraisocyanatosilane provided a mixture of isocyanatooligosiloxanes. Hexaisocyanatodisiloxane was isolated by distillation from the reaction mixture with some impurities produced by the disproportionation of hexaisocyanatodisiloxane on heating. The reaction of hexaisocyanatodisiloxane with alcohols provided partially alkoxy-substituted isocyanatodisiloxanes, [(RO)(n)(NCO)(3-n)Si]2O (R = Et, n = 2-3; R = Pr(i), n = 1 - 3; and R = Bu(t), n = 1 - 2), selectively and in high yield.

Diffusion pump oil synthesis method

The invention relates to the chemical industry field, particularly to a diffusion pump oil synthesis method, which specifically comprises: (1) carrying out a hydrolysis reaction on methyl triethoxysilane to obtain 1,3-dimethyl-1,1,3,3-tetraethoxydisiloxane (short for compound B); (2) under a strong alkali condition, carrying out balanced telomerization on the compound B and a dimethyl ring body or methylphenyl ring body to obtain a compound D; (3) carrying out a sodium condensation reaction on the compound D, chlorobenzene and sodium to obtain the diffusion pump oil. According to the present invention, the reaction order is re-combined, and the method has advantages of low energy consumption and environmentally friendly process compared to the method in the prior art.