is a group of materials commonly used in seals. The excellent characteristics of rubber materials can not only ensure that the sealing system works for a long time without leakage, but also can deal with different occasions and obtain a perfect sealing effect. seals are a kind of universal basic element in sealing devices, which play a very important role in the inherent contradiction between leakage and sealing. Solving the problems of leakage and sealing in the process of human conquest of nature has been promoting technological progress, an important way to prevent and reduce environmental pollution, rubber seals
seals are a type of rubber products widely used in sealing technology. Because rubber has a valuable elastic polymer material, it has a wide temperature range, and a small stress in different media will produce a large deformation. This deformation can provide contact pressure, compensate for the leakage gap, and achieve the purpose of sealing. Widespread attention. Common rubber sealing material classification machine application areas can be divided into natural rubber and synthetic rubber. Among them, the consumption of natural rubber accounts for 1/3, and the consumption of synthetic rubber accounts for 2/3. Usually what we call natural rubber refers to the natural latex collected from rubber trees, which is made of solid material through coagulation, drying and other processing procedures. Natural rubber is a natural polymer compound with polyisoprene as the main component. Its rubber hydrocarbon content is more than 90%, and it also contains a small amount of protein. Fatty acids, sugars and ash, etc. Natural rubber NR is made from latex collected from the rubber tree, which is a polymer of isoprene. Has good wear resistance, high elasticity, breaking strength and elongation. It is easy to age in the air, becomes sticky when heated, expands and dissolves easily in mineral oil or gasoline, and is resistant to alkali but not strong acid. Advantages: Good elasticity, acid and alkali resistance. Disadvantages of weather resistance are the raw materials for making tapes, hoses, and rubber seals shoes, and are suitable for shock absorption parts and brake fluids in automobiles. Products used in oxyhydrogen liquids such as ethanol. Compared with natural rubber, SBR is a copolymer of butadiene and styrene. Compared with natural rubber, it has uniform quality and less foreign matter, and has better wear resistance and aging resistance, but its mechanical strength is weaker. It can be used in combination with natural rubber. . Butyl rubber IIR is made of a polymer of isobutylene and a small amount of isoprene. It has good resistance to heat, sunlight and ozone. It has good electrical insulation; it has great resistance to polar solvents, is impermeable to most general gases, and is resistant to sunlight. And odor has good resistance to exposure to animal or vegetable oils or vaporized chemicals. It is not recommended to use it together with petroleum solvents, kerosene and aromatic hydrogen for inner tubes of automobile tires, leather bags, rubber grease, window frame rubber seals, steam hoses, heat-resistant conveyor belts, etc. Hydrogenated nitrile butadiene (HNBR) hydrogenated nitrile is more than nitrile rubber by removing part of the double chain after hydrogenation. After hydrogenation, the temperature resistance and weather resistance are much improved than that of general nitrile rubber, and the oil resistance is much higher than that of general nitrile. Oil resistance The property is similar to that of general nitrile. Compared with general nitrile rubber, hydrogenated nitrile has better anti-wear properties, and has excellent corrosion resistance, tension resistance, tear resistance, etc. Good resistance to ozone and atmospheric conditions, generally suitable for use in laundry or dishwashing detergents. Alcohols, lipids are not recommended. Hydrogenated nitrile is widely used in seals in environmentally friendly refrigerant R134a systems. sealing strip is one of the products with the fastest development and the fastest increasing demand in the domestic rubber industry this year. effect. The production process of rubber sealing strip mostly adopts continuous high-temperature extrusion, microwave vulcanization, hot air post-vulcanization process, and the vulcanization temperature can be as high as 300 ℃; some companies can flock, cut, and join online, with a high degree of automation; salt bath vulcanization uses nitrates There are new developments to replace nitrite. Company website: https://www.orksealing.com/
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