Summarize the types and structures of rubber materials

1) Natural rubber: Made from rubber tree latex, it is a polymer of isoprene. Has good abrasion resistance, high elasticity, tear strength and elongation. It is easy to age in the air, become sticky when heated, easily expand and dissolve in mineral oil or gasoline, and is resistant to alkali but not strong acid. Advantages: good elasticity, acid and alkali resistance. It is the raw material for making tapes, hoses, and rubber shoes, and is suitable for making shock-absorbing parts and products used in hydroxide-containing liquids such as automobile brake fluid and ethanol.
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2) Styrene butadiene rubber: Copolymer of butadiene and styrene. Compared with natural rubber, it has uniform quality, less foreign matter, better abrasion resistance and aging resistance, but weaker mechanical strength. Blended for use. Advantages: low cost non-oil resistant materials, good water resistance, good elasticity below 70, poor compression at high hardness, widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.

3) Butyl rubber: It is made by polymerizing isobutylene with a small amount of isoprene. Because the methyl steric molecules have less movement than other polymers, they have less gas permeability and resistance to heat, sunlight and ozone. Large, electrical insulation is good; resistance to polar capacitors is large, the general use temperature range is -54-110 ℃. Advantages: Impermeability to most general gases, good resistance to sunlight and odors, can be exposed to animal or vegetable oils or vaporizable chemicals. Inner tube, leather bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt, etc.
4) Hydrogenated butadiene rubber: Hydrogenated butadiene rubber is a part of the double chains in hydrogenated butadiene rubber after hydrogenation. After hydrogenation, its temperature resistance and weather resistance are much higher than ordinary butadiene rubber. similar. The general use temperature range is -25 ~ 150 ℃. Advantages: It has better abrasion resistance than nitrile rubber, has excellent characteristics of corrosion resistance, tensile resistance, tear resistance and compression, and has good resistance in atmospheric conditions such as ozone. It is generally suitable for laundry or washing Bowl of cleaning agent. Widely used in environmentally friendly refrigerant R134a system seals.
5) Ethylene-propylene rubber: It is made by copolymerizing ethylene and propylene, so it has excellent heat resistance, aging resistance, ozone resistance, and stability, but it cannot be sulfur-sulfurized. In order to solve this problem, a small amount of double-stranded third component is introduced into the EP main chain and sulfur can be added to form EPDM. The general use temperature is -50 ~ 150 ℃. Excellent resistance to polar solvents such as alcohols and ketones. Advantages: Good weather resistance and ozone resistance, excellent water resistance and chemical resistance, alcohols and ketones can be used, high temperature steam resistance, and good impermeability to gases. Seals or parts of sanitary equipment in high temperature water vapor environment. Rubber parts in a braking (braking) system. Seal in radiator (car water tank).
6) Butadiene rubber: It is made by copolymerizing acrylonitrile and butadiene. The content of acrylonitrile is from 18% to 50%. The higher the acrylonitrile content, the better the resistance to petrochemical hydrocarbon fuel oil. The performance deteriorates, and the general temperature range is -25 ~ 100 ℃. Butadiene rubber is one of the most commonly used rubbers for oil seals and O-rings. Advantages: Good oil resistance, water resistance, solvent resistance, high pressure oil resistance, good compressibility, abrasion resistance and elongation. Used to make fuel tanks, lubricating oil tanks, and rubber parts used in fluid media such as petroleum-based hydraulic oil, gasoline, water, silicone oil, and diester-based lubricants, especially seal parts. It can be said to be the most widely used and lowest cost rubber seal.
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7) Neoprene: 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 severe distortion. It is not afraid of refrigerants. It is resistant to dilute acid and silicone ester lubricants. oil. It is easy to crystallize and harden at low temperature, has poor storage stability, and has a large swelling amount in mineral oil with low aniline point. The general 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. With anti-animal and vegetable oil properties, it will not affect physical properties due to neutral chemicals, fats, oils, various oils and solvents, and has anti-flammability properties. Suitable for making a variety of parts that are in direct contact with the atmosphere, sunlight and ozone. Applicable to all kinds of flame-resistant and chemical-resistant rubber products.

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