What Are The Advantages And Disadvantages Of Rubber?
(Styrene Butadiene Copolymer) Compared with natural rubber, the copolymer of butadiene and styrene has uniform quality, less foreign matter, better abrasion resistance and aging resistance, but weaker mechanical strength. It can be blended with natural rubber Use together. Advantages: low-cost non-oil-resistant material, good water resistance, good elasticity with hardness below 70, and poor compressibility at high hardness. Disadvantages: It is not recommended to use strong acids, ozone, oils, oil esters and fats, and most of the hydrocarbons. It is widely used in tire industry, shoe industry, cloth industry and conveyor belt industry, etc.
2. Hydrogenated nitrile rubber HNBR
(Hydrogenate Nitrile) The hydrogenated nitrile rubber is hydrogenated to remove part of the double strands in the nitrile rubber. After hydrogenation, its temperature resistance and weather resistance are much higher than the general nitrile rubber, and the oil resistance is similar to that of the general nitrile rubber. The general use temperature range is minus 25-150 ℃. Advantages: It has better abrasion resistance than nitrile rubber, and has excellent corrosion resistance, tensile, tear and compression properties.
It has good resistance under atmospheric conditions such as ozone, and is generally suitable for detergents for laundry or dishwashing. Disadvantages: It is not recommended to be used in the air conditioning and refrigeration industry in alcohols, esters or aromatic solutions. It is widely used in environmentally friendly refrigerants, seals in R134a systems, and seals in automobile engine systems.
3. Nitrile rubber NBR
(Nitrile Rubber) is made by copolymerization of acrylonitrile and butadiene. The acrylonitrile content is 18%-50%. The higher the acrylonitrile content, the better the resistance to petrochemical hydrocarbon fuel oil, but the low temperature performance will change. Poor, the general use temperature range is minus 25-100 ℃. Nitrile rubber is currently one of the most commonly used rubbers for oil seals and O-rings. It has good oil resistance, water resistance, solvent resistance and high pressure oil resistance.
It has good compressibility, abrasion resistance and elongation.
Disadvantages: Not suitable for use in polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. ?Used to make fuel tanks, lubricating oil tanks and in petroleum hydraulic oil, gasoline, water, silicone oil, diester Rubber parts used in fluid media such as lubricating oil, especially sealing parts. It can be said to be the most versatile and lowest cost rubber seal at present.
4. Neoprene CR
(Neoprene, Polychloroprene) are polymerized from chloroprene monomer. The vulcanized rubber has good elasticity and abrasion resistance. It is not afraid of direct sunlight. It has particularly good weather resistance. It is not afraid of fierce distortion and refrigerant. It is resistant to dilute acid and silicone ester lubricants, but not resistant to phosphate hydraulic pressure. oil. It is easy to crystallize and harden at low temperature, has poor storage stability, and has a large expansion in mineral oil with low aniline point. The general use temperature range is -50~150 ℃. Advantages: good elasticity and good compression deformation. The formula does not contain sulfur, so it is very easy to make. It is resistant to animal and vegetable oils. It will not be affected by neutral chemicals, fats, greases, various oils, and solvents. Affects physical properties and has anti-flammability properties.
Disadvantages: It is not recommended to use strong acids, nitro hydrocarbons, esters, chloroform and ketones among the chemical substances resistant to R12 refrigerants, rubber parts or seals on household appliances. It is suitable for making all kinds of parts that directly contact the atmosphere, sunlight and ozone. Suitable for all kinds of flame-resistant and chemical-resistant rubber products.
Synthetic rubber composition: Synthetic rubber is a polymer made of petroleum and natural gas as raw materials, and diolefins and olefins as monomers.
The polymer of rubber has broken through the process of monomer polymerization, and the world's leading rubber factories have begun to use higher-strength rubber, which is made of ultra-polymer aggregates, and the cost is quite low.
5. Natural rubber NR
(Natural Rubber) It is made from rubber latex collected from rubber tree and is a polymer of isoprene. It has good wear resistance, high elasticity, tear strength and elongation. It is easy to age in the air, becomes sticky when exposed to heat, easily swells and dissolves in mineral oil or gasoline, and is resistant to alkali but not strong acid. Advantages: good elasticity, acid and alkali resistance. Disadvantages: not heat-resistant and oil-resistant (vegetable oil resistant). It is a raw material for making tapes, hoses, and rubber shoes.