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Advantages and disadvantages of rubber
- Jan 10, 2019 -

Natural rubber NR

(Natural Rubber) Made of rubber tree-collecting latex, a polymer of isoprene. 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, oil-resistant (resistant to vegetable oil), is the raw material for making tapes, hoses and rubber shoes, and is suitable for the production of shock-absorbing parts, products used in automotive brake oil, ethanol and other liquids with hydroxide.

SBR styrene SBR

(Styrene Butadiene Copolymer) Copolymer of butadiene and styrene, compared with natural rubber, uniform quality, less foreign matter, better wear resistance and aging resistance, but weak mechanical strength, can be mixed with natural rubber Used together. Advantages: low-cost non-oil resistant material, good water resistance, good elasticity below 70, and poor compression at high hardness. Disadvantages: It is not recommended to use strong acids, ozone, oils, oil esters and fats and most 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. Since the steric obstacle of methyl group has less movement than other polymers, it has less gas permeability and is more resistant to heat, sunlight and ozone. The electrical insulation is good; the resistance to the polar agent is large, and the general temperature range is minus 54-110 °C. Advantages: It is impervious to most general gases, has good resistance to sunlight and odor, and can be exposed to animal or vegetable oils or gasification chemicals. Disadvantages: Not recommended for use with petroleum solvents, coal kerosene and aromatic hydrogen. Inner tube, leather bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt, etc. for automobile tires.

Hydrogenated nitrile rubber HNBR

(Hydrogenate Nitrile) Hydrogenated nitrile rubber is a nitrile rubber which is partially hydrogenated to remove some double chains. After hydrogenation, its temperature resistance and weather resistance are much higher than that of general nitrile rubber. The oil resistance is similar to that of general nitrile rubber. The general operating temperature range is minus 25-150 °C. Advantages: It has better abrasion resistance than nitrile rubber, and has excellent properties of corrosion resistance, tensile strength, tear resistance and compression.

It is resistant to atmospheric conditions such as ozone and is generally suitable for use in laundry or dishwashing detergents. Disadvantages: It is not recommended for use in alcohol, ester or aromatic solutions. It is widely used in environmentally friendly refrigerants, seals in R134a systems, and automotive engine system seals.

Ethylene-propylene rubber EPDM

Ethylene propylene rubber is a copolymer of ethylene and propylene. Therefore, it is excellent in heat resistance, aging resistance, ozone resistance, and stability, but it cannot be sulfur-added. In order to solve this problem, a small amount of a double-stranded third component is introduced into the EP main chain, and sulfur can be added to form EPDM, and the temperature is generally 50-150 ° C under zero temperature. Excellent resistance to polar solvents such as alcohols and ketones: good weather resistance and ozone resistance, excellent water resistance and chemical resistance, alcohols and ketones, high temperature steam, gas With good impermeability. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals or parts for sanitary equipment seals in high temperature steam environments. Rubber parts in the brake (brake) system. Seals in radiators (car tanks).

Nitrile rubber NBR

(Nitrile Rubber) is a copolymer of acrylonitrile and butadiene with an acrylonitrile content of 18%-50%. The higher the acrylonitrile content, the better the resistance to fossil fuel hydrocarbon fuel oil, but the low temperature performance changes. Poor, the general operating temperature range is minus 25-100 °C. Nitrile rubber is one of the most commonly used rubbers for oil seals and O-rings. It has good oil, water, solvent and high pressure resistant properties.

Good compressibility, abrasion resistance and elongation.

Disadvantages: Not suitable for use in polar solvents such as ketones, ozone, nitrohydrocarbons, MEK and chloroform. Used in fuel tanks, oil tanks, and petroleum-based hydraulic oils, gasoline, water, silicone oils, diesters. It is a rubber part used in a fluid medium such as lubricating oil, especially a sealing part. It can be said that it is the most widely used and lowest cost rubber seal.

Neoprene CR

(Neoprene, Polychloroprene) is a polymer of chlorobutene monomers. The rubber after vulcanization has good elastic wear resistance, is not afraid of direct sunlight, has good weather resistance, is not afraid of intense distortion, is not afraid of refrigerant, is resistant to dilute acid and silicon ester-based lubricating oil, but is not resistant to phosphate ester hydraulic system. oil. It is easy to crystallize and harden at low temperature, and has poor storage stability. It has a large expansion amount in mineral oil with low aniline point, and the general temperature range is -50~150 °C. Advantages: good elasticity and good compression deformation, the formula does not contain sulfur, so it is very easy to make, with anti-animal and vegetable oil properties, not due to neutral chemicals, fat, grease, various oils, solvents Affects physical properties and has anti-combustion properties.

Disadvantages: It is not recommended to use R12 refrigerant seals, rubber parts or seals on household appliances, among the chemicals of strong acids, nitrohydrocarbons, esters, chloroforms and ketones. Suitable for making all kinds of parts that are in direct contact with the atmosphere, sunlight and ozone. Suitable for all kinds of rubber and chemical resistant rubber products.

Synthetic rubber composition: Synthetic rubber is a polymer obtained by polymerizing diolefins and olefins as a raw material of petroleum and natural gas.

The polymer of rubber has broken through the process of monomer polymerization. The world's leading rubber factory has begun to use higher strength rubber, which is made of ultra-high polymer, and the cost is quite low.