Octamethylcyclotetrasiloxane
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Octamethylcyclotetrasiloxane
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CAS No:
556-67-2
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Formula:
C8H24O4Si4
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Chemical Name:
Octamethylcyclotetrasiloxane
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Synonyms:
Cyclotetrasiloxane,2,2,4,4,6,6,8,8-octamethyl-;Cyclotetrasiloxane,octamethyl-;2,2,4,4,6,6,8,8-Octamethylcyclotetrasiloxane;Octamethylcyclotetrasiloxane;NUC Silicone VS 7207;Union Carbide 7207;SF 1173;UC 7207;VS 7207;Cyclic dimethylsiloxane tetramer;KF 994;SH 344;Abil K 4;Octamethylcyclotetrasiloxanes;Silbione V 2;Dow Corning 244;Dow Corning 344;Volasil 244;DC 344;Mirasil CM 4;TSF 404;LS 8620;D 4;Dabco DC 5258;DC 5258;Tetracyclomethicone;Y 7175;NSC 345674;SH 244;Silbione 70045V2;DC 244;Dow Corning 244 Fluid;DWQ 110;DWQ 120;PMX 0110;XF 3803;YF 393;ZBH 270;SH 244 Fluid;SH 30;Additive 8030;2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane;L 6907;83874-62-8;104986-37-0;117563-66-3;1257661-59-8
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CAS No:
Description
It is milk-white viscous liquid and is non-volatile and odorless. It has a relative density of O.98~1.02. It is miscible with benzene, gasoline and other kinds of chlorinated hydrocarbons, aliphatic and aromatic hydrocarbons; it is not soluble in methanol, ethanol and water, but can be dispersed in water. It is Non-flammable, non-corrosive and is chemically stable. ADI: 0~1.5mg /start (FAO/WHO, 1994). viscous colourless liquid
Characteristics
40.46
-0.3272
Transparent colorless liquid
0.9558 g/cm3
17.5 °C
175 °C
33 °F
n20/D 1.377(lit.)
H2O: Insoluble
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container.
<5 mm Hg ( 25 °C)
>1 (vs air)
LD50 oral in rat: > 17gm/kg
Safety Information
UN 1993 3/PG 2
3
R11; R65; R48/23/24/25; R36/38; R46; R45
S16; S24/25; S62; S45; S36/37; S26; S53
JM9237000
F
Stable. Incompatible with strong oxidizing agents.
P273
H411
Octamethylcyclotetrasiloxane Use and Manufacturing
1. Polymethylsiloxane and fumed silica mixed roll into a silicone grease, then add polyoxyethylene alcohol, Tween 80 and deionized water and other emulsified.
2. Dimethyl dichlorosilane, water, solvent as raw materials, by hydrolysis, neutralization, fractionation to get octamethyl cyclotetrasiloxane. Octamethylcyclotetrasiloxane in the catalyst under the action of polymerization in the system.
3. There are two kinds of acid balance method and alkali balance method. Acid balance method is suitable for the production of low viscosity silicone oil with a kinematic viscosity of less than 500mm2 / s. The method is usually used as the catalyst in concentrated sulfuric acid, reacted at 50 ~ 50 ℃, then washed with acid, de-boiling, Finished product. The alkali balance law is suitable for the production of kinematic viscosity above 100mm2 / s, high viscosity silicone oil. It is also possible to synthesize methyl silicone oil by using the method of temperature control at 90 ~ 120 ℃ using dimethyl mixed ring and decamethyltetrasiloxane as raw materials and tetramethylammonium hydroxide as catalyst. The conversion rate can be increased from an average of 65% to 80% or more.
Polydimethylsiloxane (PDMS) belongs to a group of polymeric organosilicon compounds that are commonly referred to as silicones. PDMS is the most widely used silicon-based organic polymer, and is particularly known for its unusual rheological (or flow) properties. PDMS is optically clear, and, in general, inert, non-toxic, and non-flammable. It is also called dimethicone and is one of several types of silicone oil (polymerized siloxane). Its applications range from contact lenses and medical devices to elastomers; it is also present in shampoos (as dimethicone makes hair shiny and slippery), food (antifoaming agent), caulking, lubricants, kinetic sand, and heat-resistant tiles.
Computed Properties
Molecular Weight:296.61
Hydrogen Bond Acceptor Count:4
Exact Mass:296.07516538
Monoisotopic Mass:296.07516538
Topological Polar Surface Area:36.9
Heavy Atom Count:16
Complexity:197
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes
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