What rubber seal is used to produce rubber seals? Today speaking about different rubber material
characteristics!
The rubber seals are different from the requirements of the environment and the situation.
The rubber oil seals are made of nitrile rubber, hydrogenated butyronitrile rubber,
Acrylic rubber and fluorine rubber, fluorosilicone rubber, perfluoro rubber, etc.
One, nitrile rubber
Production seals of very common materials, oil - resistant sealing products adopt butyronitrile rubber.
Nitrile rubber has excellent
properties of fuel oil and aromatic solvents. Ordinary requirements can be met and the cost is low.
2. Natural rubberCompared with most synthetic rubber, natural rubber has good comprehensive mechanical properties, cold
resistance, high resilience and wear resistance. Natural rubber is not resistant to mineral oil, but in
plants
Oil and alcohol are more stable.
3. Acrylate rubber
Acrylate rubber comprehensive performance is very
excellent, of heat oil resistant temperature can be as high as 180 ℃ to 200 ℃, widely used for high
temperature resistant, heat resistant oil products.
Acrylic rubber, known as the rubber of the car, is an
important material in the automobile industry, which is used in the manufacture of rubber oil seals, o-rings,
gaskets and rubber tubes.
Acrylate rubber also has many other excellent properties - ozone resistance,
flexure, weathering, good air tightness, rubber transparency and good adhesion.
The application of acrylate
rubber is quite extensive - sponge products, deep well exploration, and parts of the electrical industry are
substituted for silicone rubber and adhesive.
4. Fluoro rubber
Fluoro rubber (fluororubber) is a synthetic
polymer elastomer containing fluorine atoms on the carbon atom of the main chain or side chain.
The advantages
of fluoro rubber
In rubber seal material, its heat resistance (decomposition temperature is greater than 400
degrees Celsius), oil resistance (various fuel oil, hydraulic oil, lubricating oil, synthetic oil), solvent
resistance and climate resistance(it is best to be resistant to the line, ozone and radiation) and chemical
resistance. All the polyacrylonitrile rubber and polyurethane rubber can not be used in high temperature or
special working fluidIt can be used as the material of the sealing parts, not spontaneous combustion, non-
combustion, self-extinguishing of the fire, and good physical mechanical properties, it is the comprehensive
strength of all synthetic rubber
The best, commonly known as "rubber king", is one of the indispensable and
alternative basic materials for modern industry, especially high-tech fields.
The defect of fluoro rubber is
not easy to master, the price is higher, it is 20 times as high as nitrile rubber, it is cold, it has poor
water resistance, it is less elastic in normal temperature, and the market
It has been developed
The cold and
water-resistant fluorine rubber products, and the tolerance and drug resistance are better than the FFKM of
ordinary fluorine rubber, but are 10 times as high as fluorine rubber.
Application of fluorine rubber seal
Fluoroprene is widely used in defense, military, automotive and aerospace, aerospace and petroleum fields, and
fluoro-rubber oil seals are used in drilling machinery, refining equipment, and natural gas desulfurization
devicesIn addition, high temperature and high pressure oil and strong corrosive medium are also available. In
the chemical field, fluorine-rubber oil seals are used in pumps, pipe joints and equipment containers
Encapsulate inorganic acid, have chemical substances; In the military industry, fluorine rubber is mainly used
for aerospace, aviation and carrier rockets, satellites, fighter jets, oil seals for new tanks, and pipelines
The electric circuit sheath is one of the key materials that can not be replaced in the defense advanced
industry.
5. Hydrogenated butadiene rubberThe hydrogenated butyronitrile rubber is a synthetic polymer that
is saturated with the hydrogenation of the hydrocarbon chain of the nitrile rubber. This special hydrogenation
process reduces many butyronitrile rubber (NBR).
The double bond of the polymerized owner chain, therefore,
the hydrogenated nitrile rubber has a higher heat resistance and ozone resistance than the butyronitrile
rubberHeat, chemical resistance and mechanical properties.
As with butyronitrile rubber, the content of
acrylonitrile (ACN) is increased, and the effect of anti-petroleum base oil and fuel oil is enhanced, but its
low temperature performance is reduced. acrylonitrile
The content is usually somewhere between 18% and 50%.
The hydrogenated butadiene rubber has been used in many fields.
The hydrogenated butyronitrile rubber has been
used to replace the butyronitrile rubber with high temperature. Fluoro rubber is proved to have excellent oil
resistance and processing oil, and the test results are also shown
When placed in a modern oil well with a
small amount of amine corrosion inhibitor, it will rapidly age, and therefore has been replaced by
hydrogenated nitrile rubber. The advantages of hydrogenated nitrile rubber
Excellent heat resistance and oil
resistanceFive times more fuel - resistant and ozone - resistant than butadiene rubber
Good abrasion
resistanceThe disadvantages of hydrogenated nitrile rubber
Like the butyronitrile rubber, hydrogenated
butyronitrile rubber resistant to polar solvents. The hydrogenated butyronitrile rubber is a new type of
elastomer, which is formed by the catalytic hydrogenation of butyronitrile rubber. Hydrogenation increases its
coolingFlow (the deformation of the material resulting from the increase in the temperature or the loading of
the material). After hydrogenation reaction, due to the change of molecular structure, the elasticity of HNBR
decreased at low temperature.Vi. Fluoro silicone rubberFluorosilicone rubber, like silica gel, combines
trifluoropropyl, methyl and ethylene as side chains, but fluorosilicone rubber is treated with fluorination.
The mechanical and physical properties of fluorosilicone are similar to that of silicone
But the fluoro
silicone rubber is better than silica gel for fuel oil and mineral oil, but it is inferior to silica gel in
heat resistance. Fluorinated silicone rubber has excellent aviation fuel oil
, hydraulic oil, synthetic ester
lubricant, such as performance, can be in 204 ° C (400 ° F) long-term work under high temperature. Although
it is mostly used in aerospace, it is highly fuel resistant and high
The stability of temperature is superior,
fluorosilicone rubber is more and more commonly used in the manufacture of seals.
Advantages of fluoro silicone rubber:
Excellent high and low temperature resistance
Superior compression permanently deformability
Clean, smelly, tasteless
Disadvantages of fluoro silicone rubber:
Due to its low tensile tear resistance, low
wear resistance and high friction coefficient, fluorosilicone rubber is only recommended for static seals.
7. Perfluoro rubberThe high temperature of perfluoro rubber is superior to that of silicone rubber. It has good
chemical resistance, most oil and solvent, weather resistance and ozone resistance. This characteristic of
cold tolerance is relatively insignificant.
Advantages of full fluorine rubber:
Can heat to 200 ℃; Most oils
and solvents have the ability to resist, especially all acids, aliphatic hydrocarbons, aromatic hydrocarbons
and animal and vegetable oils. Compressive deformation
Sex is good;
Defects of perfluoroprene rubber:
The price of raw material sealing ring is high and the production process is difficult.
Application range of
perfluoro rubber:
The whole fluorine rubber seal products are widely used in high temperature, anti-ozone and
weather-resistance demanding sealing equipment and various high vacuum sealing processes. With the development
of industry,
Widely used in automobiles, electronics, aerospace, ships and other requirements of high
precision, high temperature resistance, high wear resistance, harsh conditions, military products use more.
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