Production and application properties of methyl silicone oil
Methyl silicone oil is the earliest commercially available silicone polymer. Because of its excellent oxidation resistance, shear resistance, low surface tension, hydrophobicity, defoaming and other properties, it is widely used in various sectors of the national economy, such as electrical, mechanical, coatings, medicine and so on.
In the production process of methyl silicone oil, the catalyst decomposition generates gases with irritating odor, and some of these gases are miscible in the system, which makes the silicone oil have an odor and the application is limited. Therefore, the production process of methyl silicone oil should try to eliminate the odor.
(Methyl silicone oil molecule)
Methyl silicone oil production process in a reactor, the entire production process, including the copolymerization reaction process, pumping low broken medium boiling process, insulation process and the finished product pumping and cooling process are low-boiling gas generated by the condenser (circulating water, condensing temperature of room temperature) condensation, non-condensable gas is led to the activated carbon absorber device for treatment and then discharged through the 15m exhaust pipe at high altitude.
Methyl silicone oils with different viscosities will be blended with each other. Since the flash of low-viscosity silicone oil is lower, the flash of the blended methyl silicone oil may be reduced. The chemical properties of methyl silicone oil are relatively stable, but the viscosity will change when it comes into contact with strong acid, strong alkali or metal aluminum, tin, etc. at high temperature.
Some tests have shown that between 90-120 ℃ using the program control temperature method and de-lowered and cooled to below 140 ℃, through the dry air bubbling method, can be obtained colorless, odorless and qualified indicators of methyl silicone oil, the average conversion rate increased from 65% to more than 80%.
201 Methyl silicone oil is a
What is dimethyl silicone oil?
201 Methyl silicone oil is a novel organosilicon synthetic material. It has the appearance of a colorless and transparent oily liquid. Its chemical composition is straight-chain polymethylsiloxane with the structural formula:
Due to the stability of the silicone-oxygen bond and the hydrophobicity of methyl, as well as the structural characteristics of the methylsiloxane ensemble polymerization, the methyl silicone oil has good heat resistance. High flash point, non-volatile, viscosity coefficient is small, while the compression force is large, surface tension is small, chemical stability, good electrical (insulation), and water and moisture resistance, non-toxic effect on living organisms (including humans). In order to make methyl silicone oil in other objects on the surface of the formation of thin films or made of rubber-like solid material, can be heated at high temperatures (250-300 ℃) or add the appropriate catalyst (generally with peroxide) for curing treatment. The use of methyl silicone oil temperature range of 50-180 ℃.
Methyl silicone oil of different viscosity, their physicochemical properties and characteristics of the parameters also have certain differences. There are 201-10, 201-50, 201-100, 201-350, 201-500, 201-800, 201-1000 and other grades according to the viscosity of the product. According to the user’s requirements, can also be made into other special viscosity specifications of the product.
Dimethyl silicone oil, also known as polydimethylsiloxane, is a hydrophobic silicone material with the appearance of colorless or light yellow liquid and its structural formula:
It has high transparency, light transmittance of 100% light transmittance, heat resistance, cold resistance, viscosity with temperature change is small, water resistance, small surface tension, with thermal conductivity, thermal conductivity of 0.134-0.159W/M*K, physiological inertia, good chemical stability. Electrical insulation and weather resistance, good hydrophobicity, and has a high shear resistance, can be used for a long time at -50 ℃ ~ 200 ℃. Today, we go into the strong chemical together, together to understand the dimethyl silicone oil in different fields of application!
Dimethicone oil
Application in skin care cosmetics
Dimethicone oil has been widely used in cosmetics, skin care products, care products, hair shampoo products, using the following:
Non-toxic, odorless, tasteless
01
It does not affect the appearance and aroma of the final products, and does not cause irritation and allergy to the skin;
It has very good sense of lightness of use and stretchability.
02
The use of medium-viscosity methyl silicone oil in a variety of skin care products can improve the stretchability of cosmetics on the skin, and play a protective effect on the skin;
Very good hydrophobicity and smoothness.
03
Silicone oil formulated hair care products such as hair oil, hair cream, mousse, etc., can make any temperature of the hair combed into the desired hairstyle, and can effectively prevent the external moisture infiltration or water evaporation imbalance;
Good resistance to ultraviolet radiation
04
It will not oxidize and deteriorate under ultraviolet rays and cause irritating effect on skin, and it will not be lost due to seawater bathing or sweating, so it can effectively prevent the harm of ultraviolet rays.
No irritation to skin, high safety to human body
05
It has certain effect on certain skin diseases, such as eczema neurodermatitis and occupational dermatitis with difficulty in sweating;
Have good gas permeability and anti-static elimination
06
Rubbed skin containing polysiloxane skin cream static electricity all eliminated, and there is obvious dustproof effect good breathability, even if the formation of silicone film on the skin does not affect the sweat discharge, hindering the skin breathing;
Chemical stability
07
With other cosmetic raw materials do not react, added silicone oil foundation cream, can protect the skin from pigments, solvents.
Dimethyl silicone oil
Applications in the automotive industry
Dimethicone oil’s viscosity-temperature properties, wide viscosity range, thermal stability, and high compressibility are widely used in the interior/exterior of automobiles, and typical examples of use are:
Brake fluid
Automobile brake fluid based on relatively low viscosity methyl silicone oil (20mPa-s).
Damping oil
Damping oils for automotive engine cooling fans have been practicalized to improve component performance, reduce drag and wear, and extend system life.
Tackifier
Can be used as glass fiber reinforcing materials, tackifiers, can improve the adhesion between glass fibers and resin, thus significantly improving the mechanical properties of reinforced plastics. Used in the production and maintenance of adhesive sealing materials for automotive windshield glass, door and window frames, rearview mirrors, exhaust pipes, and water-susceptible equipment.
Dimethyl silicone oil
Applications in the electromechanical industry
Dimethyl silicone oil transparent colorless, tasteless, odorless, non-toxic oily liquid. It has the characteristics of high flash point, low freezing point, good thermal stability, high and low temperature resistance. It is widely used as insulation, lubrication, shockproof, dustproof oil, dielectric fluid and heat carrier. Typical use cases are as follows:
Temperature resistance, arc corona resistance, corrosion resistance, moisture-proof, dust-proof, insulation
01
Used as impregnating agent for motors, electrical appliances, electronic instruments, transformers, capacitors, scanning transformers for TV sets, etc. ;Â
Anti-vibration, damping
02
Stabilizing instrument readings in a variety of precision machinery, instruments and gauges;
Anti-vibration
03
Mostly used for strong mechanical vibration and ambient temperature changes in the occasion, the use of instruments such as: aircraft, automobile instruments;
Liquid spring
04
Used in airplane landing devices
Dimethyl silicone oil
Application in the textile industry
Dimethicone oil is widely used in the production process of garment materials such as silk, leather, chiffon, nylon and cotton materials due to its non-toxicity, non-harmfulness, thermal stability and low coefficient of viscosity-temperature, and the use cases are as follows:
Textile & Garment
Used as softener, water-repellent agent, feel improver, chemical fiber spinneret lubrication, clothing pressure lining agent and defoamer, etc.;.
Leather Chemicals
Used as softener, water repellent agent, hand feeling agent, defoamer, brightener, etc.
Sewing thread oil
Prevent thread breakage, make sewing thread with good lubrication, anti-static, friction resistance and smoothness.
