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Advantages and disadvantages of rubber
author: Publish in:2017/6/21 10:34:06 Click amount:

Natural rubber NR
(Natural Rubber) is made of rubber latex and is a polymer of isoprene. It has good abrasion resistance, high elasticity, breaking strength and elongation. Aging in the air, Sticky, easy to expand and dissolve in mineral oil or gasoline, alkali resistant but not resistant to strong acid. Advantages: good elasticity, acid and alkali. Disadvantages: not weather, not resistant to oil (resistant to vegetable oil) is the production of tape, hose, rubber shoes and raw materials, and for the production of shock absorber parts, in the car brake oil, ethanol and other products used in the liquid hydroxide.
SBR SBR
(Styrene Butadiene Copolymer) Butadiene and styrene copolymer, compared with natural rubber, uniform quality, less foreign body, with better wear resistance and aging resistance, but the mechanical strength is weak, with natural rubber Use. Advantages: low-cost non-oil resistant material, good water resistance, hardness of 70 or less with good elasticity, high hardness with poor compression, Disadvantages: do not recommend the use of strong acid, ozone, oil, oil and fat and large Part of the hydrocarbons. Widely used in the tire industry, footwear, cloth industry and conveyor belt industry.
Butyl rubber IIR
(Butyl Rubber) is a mixture of isobutylene and a small amount of isoprene, and the movement of the stereoscopic molecules of methylation is less than that of other polymers, so that the gas permeability is small and the resistance to heat, sunlight and ozone is large, Electrical insulation is good; the resistance of the polar agent, the general use of temperature range of -54-110 ° C. Advantages: most of the general gas is impermeable to the sun and smelly with good resistance can be exposed to Animal or vegetable oil or gasifiable chemicals. Disadvantages: It is not recommended to use the inner tire, bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt for automobile tires with petroleum solvent, kerosene and aromatic hydrogen.
Hydrogenated Butteratin HNBR
(Hydrogenate Nitrile) Hydrogenated Butteratin for Dingqing gum after hydrogenation to remove part of the double chain, after hydrogenation of its temperature resistance, weatherability than the general increase in a lot of NBR, oil resistance and general Dingqing plastic similar. General use temperature range of -25 ~ 150 ℃. Advantages: better than Dingqing plastic wear resistance, with excellent resistance to corrosion, tensile, tear resistance and compression characteristics
In the ozone and other atmospheric conditions with good resistance, generally applicable to laundry or dishwashing cleaning agent. Disadvantages: It is not recommended for use in alcohols, esters or aromatic solutions in the air-conditioning refrigeration industry, widely used in environmentally friendly refrigerant R134a system seals.
Automotive engine system seals.
Ethylene propylene rubber is made from copolymerized ethylene and propylene, so heat resistance, aging resistance, ozone resistance and stability are excellent, but can not be sulfur and sulfur. To solve this problem, in EP The main chain into a small amount of double-chain of the third component and can add sulfur as EPDM, the general use of the temperature of -50 ~ 150 ° C. Polar solvents such as alcohol, ketones and other excellent resistance: a good resistance And anti-ozone, with excellent water resistance and anti-character, can use alcohol and ketones, high temperature steam, the gas has a good impermeability. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals or parts of sanitary ware for high temperature water vapor. Brake (brake) system in the rubber parts. A seal in a radiator (car water tank).
NBR
(Nitrile Rubber) from acrylonitrile and butadiene copolymerization, acrylonitrile content from 18% to 50%, the higher the acrylonitrile content, the petrochemical oil hydrocarbon fuel oil resistance is better, but the low temperature performance Deterioration, the general use of the temperature range of -25 ~ 100 ℃. NBR is one of the most commonly used rubber for oil seals and O-rings. Advantages: Good resistance to oil, water resistance, solvent resistance and resistance to high pressure oil
With good compression, anti-wear and elongation.
Disadvantages: Not suitable for use in polar solvents such as ketones, ozone, nitrohydrocarbons, MEK and chloroform. For the production of fuel tanks, lubricating tanks and oil in the hydraulic system, gasoline, water, silicone oil, Lubricants and other fluid media used in the rubber parts, especially the sealing parts can be said to be the most widely used, the lowest cost rubber seals
Neoprene CR
(Neoprene, Polychloroprene) from chloroprene monomer polymerization made of vulcanized rubber elastic wear resistance, not afraid of direct sunlight, there is a particularly good weathering performance, not afraid of intense distortion, not afraid of refrigerant, Acid, resistant to silicone-based lubricating oil, but not resistant to phosphoric acid ester hydraulic oil. At low temperatures easy to crystallization, hardening, storage stability is poor, low in the mineral point of mineral oil in the expansion of large. General use temperature range of -50 ~ 150 ℃. Advantages: good elasticity and good compression deformation, the formula does not contain sulfur is very easy to produce. With anti-animal and vegetable oil characteristics, not because of neutral chemicals, fat, grease, a variety of oil, Solvent and affect the physical properties, with anti-burning properties
Disadvantages: It is not recommended to use strong acids, nitrohydrocarbons, esters, chloroform and ketone chemicals in the resistance of R12 refrigerant seals, household appliances on the rubber parts or seals. Suitable for the production of a variety of direct contact with the atmosphere, sunlight, ozone parts. Applicable to all kinds of fire-resistant, chemical-resistant rubber products.
Fluorine rubber FKM
Advantages and Disadvantages of Viton and Its Applicable Medium
Fluorocarbon is an elastomeric polymer having a fluorine atom attached to the carbon atom of the molecular main chain or side chain obtained by polymerization or polycondensation of the fluorine-containing monomer. Due to the different fluorine-containing monomers used in the manufacture, fluorine rubber has many varieties, large categories can be divided into fluorine-containing olefin copolymers and nitroso-based copolymer. Specifically, according to the chemical composition can be divided into fluorine-containing fluorine-like rubber, fluorosilicone rubber, nitroso fluorine rubber, fluorinated acrylic rubber, fluorinated nitrile rubber, fluorine-containing ether rubber. Fluorine rubber with high temperature, oil and resistance to a variety of chemical erosion characteristics, modern aviation, missiles, rockets, aerospace and other cutting-edge science and technology indispensable materials. With the automotive industry on the reliability, security and other requirements of the continuous improvement of the amount of fluorine rubber in the car also increased rapidly.
Temperature range: -45 ℃ ~ 204 ℃
Advantages: · Excellent chemical stability, resistance to most of the oil and solvents, especially the various acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils · Excellent high temperature resistance · Good aging resistance · Excellent vacuum performance · Excellent mechanical properties · Good electrical properties · Good permeability
Disadvantages:
· Not recommended for ketones, low molecular weight esters and nitro-containing compounds · Low temperature performance is poor · Radiation resistance is poor
Applicable media:
· Mineral oil, ASTM No. 1 oil IRM902 oil and 903 oil
· Non combustible HFD hydraulic oil
· Silicone oil and silicon ester
Mineral and vegetable oil, fat
· Aliphatic hydrocarbons (butane, propane, natural gas)
· Aromatic hydrocarbons (toluene, xylene)
· Chlorinated hydrocarbons (trichloroethane, carbon tetrachloride)
· Gasoline (including high alcohol)
· High vacuum
Not applicable Media:
· Ethylene glycol-based brake oil
Ammonia, amine, alkali
· Superheated water vapor
Low molecular weight organic acids (formic acid and acetic acid)




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