Silicone oil usually refers to keep linear polysiloxane liquid state at room temperature.Generally divided into two categories, methyl silicone oil and modified silicone oil.The most commonly used silicone oil methyl silicone oil, also known as the common silicone oil, its organic linkers are all methyl silicone fluid has good chemical stability, insulation, hydrophobic performance is good.It is formed by dimethyl dichloride silane hydrolysis water was condensed ring body, at the beginning of the ring body through pyrolysis and distillation was low ring body, and then put the ring body, head agent, catalyst with tips can be a mixture of different degree of polymerization, the vacuum distillation to remove silicone oil can be obtained from the lower boiling.
Chinese name Silicone oil alias Annular polydimethylsiloxane melting point - 50 ℃ water soluble PRACTICALLY INSOLUBLE appearance Colorless, tasteless non-toxic volatile liquid applied senior damping oil, lubricating oil, shock-proof oil, insulating oil, defoaming agent foreign names Silicone oil chemical formula (CH3) 3 the sio n - [(CH3) 2 the sio] Si (CH3) 3 boiling point 101 ℃ density 0.963 flash point 300 ℃
A. Chemical properties
Silicone oil usually refers to keep linear polysiloxane liquid state at room temperature products, structured as follows: the type, R is alkyl, aryl, R 'for alkyl, aryl, hydrogen, carbon, functionality, and polyether chain, etc.;X alkenyl alkyl, aryl and chain, hydrogen and hydroxyl, alkoxy, acetoxyl group, carbon, chlorine v of functionality and polyether chain, etc.;N, m = 0, 1, 2, 3...
The most commonly used silicone oil, organic linkers are all methyl, methyl silicone oil.Organic groups can also adopt other organic linkers instead of part of the methyl group, some kind of performance and to improve the silicone oil for various purposes.Common other groups are hydrogen, ethyl, phenyl, chlorobenzene, propyl three fluorine, etc.In recent years, organic modified silicone oil has been developed rapidly, many have special performance of organic modified silicone oil.
Silicone oil by chemical structure to score ethyl methyl silicone oil, silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, dimethyl silicone oil, silicone oil methyl benzene group and methyl ethoxy silicone oil, methyl propyl three fluorine silicone oil, methyl vinyl silicone oil, methyl hydroxy ethyl hydrogen silicone oil, silicone oil, hydroxyl silicone oil containing hydrogen cyanide silicone oil, etc.;From the purpose, has the damping silicone oil, silicone oil diffusion pump, hydraulic oil, insulating oil, heat transfer oil, brake oil, etc.
Melting point: - 50 ℃
Boiling point: 101 ° C (lit.)
Fold the shoot rate: 1.403 to 1.406
Flash light point: 300 ℃
Water solubility: PRACTICALLY INSOLUBLE
Expansion coefficient (25-100 ℃) : 9.45 * 10-3 silicone oil
Silicone oil is usually colorless or pale yellow, odorless, non-toxic, volatile liquid.Silicone oil insoluble in water, methanol, alcohol and 2 - ethoxy ethanol, with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or miscibility of kerosene, slightly soluble in acetone, 4-dioxane, ethanol and butanol.It has very little vapor pressure, high flash point and burning point, low freezing point.With the number n of different chain segment, the increase of molecular weight, viscosity also increased, so the silicone oil can have a variety of different viscosity, from 0.65 mm stoke to millions of stoke duty.Available if you want to produce low viscosity of silicone oil, acid clay as a catalyst, and the paper under the temperature 180 ℃, or with sulfuric acid as catalyst, the paper under the low temperature, high viscosity silicone oil or dope available alkaline catalyst.
Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobic, physiological inertia and smaller surface tension, moreover also has low compressibility) viscosity-temperature coefficient, high resistance to some varieties have radiation resistant performance.
2 the application of silicone oil fields
Silicone oil has a very wide range of application scope.It not only as an aviation, cutting-edge technology and military technology department
Use of special material, but also used in departments of national economy, has expanded its scope of application: construction, electrical and electronic, textile, automobile, machinery, paper and leather, chemical light industry, metal, paint, medicine, medical and so on.
Silicone oil and its derivatives is mainly used for damping oil, dielectric oil, hydraulic oil, heat transfer oil, oil diffusion pump, defoaming agent, lubricant, hydrophobic
Additive agent, paint, polish, cosmetics and daily necessities additives, surfactants, particle and fiber treating agent, silicone, flocculating agent.
Silicone rubber is divided into room temperature vulcanized silicone rubber and high temperature vulcanization silicone rubber.The former is mainly used in: sealants, adhesives, conformal coatings, gasket, rubber foam,
Moulded parts, packaging materials, electrical insulation, glass assembly, medical implants, surgical auxiliary materials, molding material;The latter is mainly used in: steel tubes and
Hose, strip, wire and cable insulation materials, surgical auxiliary materials, flame retardant rubber pieces, penetrating sealing material, moulding parts, embossing roller, auto ignition
Cable and plug cover, extrusion parts, medical implants, laminated products, conductive rubber, fiber coating, foam rubber.
The main applications of silicon resin are: varnish, insulating paint, molding compounds, protective coating, encapsulation materials, joint coating, pressure sensitive adhesive, laminating resin and film
Agent, adhesive, masonry waterproofing agent.
Silane coupling agent is mainly used in paints, plastic rubber processing, adhesives.
Organic silicon can not only as a kind of basic materials, materials are widely used in some large industrial structure, and can be used as an aid agent or with other auxiliary materials
Material share or other materials to improve process performance.
3 silicone oil products and applications
Silicone oil has many special performance, such as temperature coefficient, high and low temperature resistance, oxidation resistance, high flash point, volatile small, good insulation, surface tension, the metal non-corrosive, non-toxic and so on.Due to these features, silicone oil to apply in many ways and has excellent effect.In all kinds of silicone oil, silicone fluid applied most widely, silicone oil is one of the most important species, followed by methyl phenyl silicone oil.Various functional silicone oil and modified silicone oil is mainly used for special purpose.
Properties: colorless, tasteless non-toxic volatile liquid.
Purpose: there are all sorts of different viscosity.Have higher heat resistance, water resistance, electrical insulation and low surface tension.Commonly used as a senior lubricating oil, shock-proof oil, insulating oil, defoaming agent, release agent, polishing agent, lubricating agent and vacuum oil diffusion pump, etc.;Emulsion can be used for automobile tires glazing, dashboard polishing, etc.With methyl silicone oil is most commonly used.After emulsion or modified in textile finishing smooth soft feel, daily care shampoo also adding emulsified silicone oil lubrication degree of hair.In addition, there are ethyl silicone oil, dimethyl silicone oil, containing acrylic silicone oil, polyether modified silicone oil (water soluble silicone oil), etc.
Preparation or source: the two functional groups and the functional groups of organic silicon monomer by hydrolytic condensation and oil.
Dimethyl silicone oil
XY - dimethyl silicone oil, chemical name polydimethylsiloxane, molecular formula is:
Dimethyl silicone oil is a kind of colorless transparent new synthetic polymer materials, has a variety of different viscosity (5 CPS ~ 8 million CPS), from easy to flow to the thick liquid of semi-solid material.This product has a special slide may just as well, softness, hydrophobic, good chemical stability, excellent electrical insulation and high and low temperature resistance.High flash point, low freezing point, and under - 50 ℃ ~ + 200 ℃, use for a long time, viscosity-temperature coefficient, compression ratio, low surface tension, hydrophobic good moisture resistance, heat coefficient of thermal conductivity is small.
Second, the technical indicators:
25 ° viscosity (Ccp) relative density refractive index of dielectric constant flash point (℃) surface tension dyn/cm
502.702700.950 ~ 0.9601.40120.9
1002.703000.960 ~ 0.9701.40221.0
3002.723000.965 ~ 0.9751.40320.1
5002.753000.965 ~ 0.9751.40321.1
10002.763000.965 ~ 0.9761.40421.2
20002.803000.970 ~ 0.9751.40421.2
Dimethyl silicone oil has a variety of excellent properties, so in industrial and agricultural production department, the defense industry, scientific research and medical and health departments and so on, all have extremely extensive application.It is widely used in electrical insulation, demoulding, defoaming and damping, shock, rolling, dustproof, waterproof, high and low moisture, etc.
1, the application of mechanical and electronic industry: dimethyl silicone oil is widely used in motor, electric appliance, electronic instrument as heat resistance, arc corona resistance, resistance to corrosion medium of electrical insulation, moistureproof, dustproof, it is used for transformer, capacitor, television scanning transformer of impregnant, etc.In all kinds of precision machinery, instrument and meter, used as a liquid shock, damping materials.Dimethyl silicone oil elimination performance is affected by temperature is small, more than for a strong mechanical shock and environmental temperature change is big occasions, using instrument, such as: aircraft, automotive instrument.Used for shock, damping and stability of the meter reading, but also can be used as liquid spring, and in the plane's landing gear.
2. As stripping agent: due to the product and not sticky rubber, plastic, metal, etc, and used for all kinds of rubber, plastic forming mold release agent, and used in precision casting.Parting is convenient, not only for it as a release agent and make products surface clean, smooth, texture clear.
3, as antifoaming agent: because this product surface tension is small, and insoluble in water, animal and plant oil and high boiling point in the mineral oil, good chemical stability, and non-toxic, used as a defoaming agent has been widely used in petroleum, chemical, medical, pharmaceutical, food processing, textile, printing and dyeing, paper making industries, as long as add 10-100 parts per million of silicone oil has good defoaming agent.
4. Do insulation, dust-proof, mouldproof coatings: in the surface dip coating a layer of glass, ceramics and dimethyl silicone oil, and in 250-300 ℃ after heat treatment, can form a layer of half a permanent waterproof, mouldproof, and insulation film.In the processing of insulation device, can improve the insulation performance of the device, with the processing of optical instruments, can prevent lens, prism mildew;In the processing of the bottle, can prolong the shelf life of the drug, do not make preparations for wall sticking loss;In the processing of the surface of the film, lubrication, reduce friction, extend the life of the film.A, as a lubricant: this product is suitable for the rubber, plastic bearing, gear lubricant.Can also be used as the steel at high temperature of steel rolling friction, or steel and other metal friction lubricant, but because of the methyl silicone oil lubrication performance at room temperature is not particularly good, in general, is not recommended as a lubricant between the metal under normal temperature.
5, as additive, this product can make many material additives, such as whitening agent can be used as paint, add a small amount of silicone oil into the paint, can make the paint film without package, not wrinkle increase the brightness, add a small amount of silicone oil into the ink, can improve the quality of printing, add a small amount of silicone oil to the polishing oils (such as car glazing oil), can increase the brightness, protective film, and has a good waterproof effect.
6, in the application of medical and health care:;Dimethyl silicone oil born without toxicity to human body, also not be fluid decomposition, so in the medical and health undertakings, has been widely used.Use its defoaming effect, make the oral gastric bowel bilges, elimination and pulmonary edema foam aerosol etc.Join the silicone oil in the ointment, can improve the drug penetration to the skin, improve the effectiveness.Silicone oil as base oil of some plasters agent to burn, dermatitis, bedsore have good curative effect, such as using silicone oil anticoagulant effect, its processing blood storage device surface are available, and extend the blood storage time, etc.
7, other aspects: this product has many USES in other ways.Such as: using its high flash point, odorless, colorless, transparent and non-toxic to human body features, such as in the steel, glass, ceramics and other industrial and scientific research, as heat transfer fluid in the oil bath or a thermostat.Can be done using its shear resistance performance is good, the hydraulic oil especially aviation hydraulic oil.With its rayon spinning processing, can eliminate static electricity, improve the quality of cocoons.On cosmetics add silicone oil can improve the skin moist and protection and so on.
4 the advantages of silicone oil
(1) glue temperature performance is the best in the liquid lubricant, in a wide temperature range viscosity changes little.Its solidifying point is less than the commonly - 50 ℃, some as high as 70 ℃, under low temperature storage for a long time, no change of its product appearance, viscosity, it is high temperature, low temperature, wide temperature range of base oil.
(2) the excellent thermal oxidation stability, such as thermal decomposition temperature > 300 ℃, the evaporation loss of small (150 ℃, 30 days, the evaporation loss is only 2%), oxidation test (200 ℃, 72 h), and the acid value, viscosity changes little.
(3) excellent electrical insulation, volume resistance at room temperature to 130 ℃ range does not change such as (but not water in oil).
(4) it is a kind of avirulent and low foaming ability and foam resistance strong oil, can be used for defoaming agent, etc.
(5) excellent shear stability, have to absorb vibration, to prevent the spread of the vibration function, as the noise energy consumption steady speed of damper medium effect is very significant.