Nitrile rubber is produced by emulsion polymerization of butadiene and acrylonitrile. Nitrile rubber is mainly produced by low-temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. . Its disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical properties, and slightly lower elasticity. Nitrile rubber is mainly used in the manufacture of oil-resistant rubber products. 1) Introduction It is also called NBR. A synthetic rubber produced by the copolymerization of butadiene and acrylonitrile. It is a synthetic rubber with good oil resistance (especially alkane oil) and aging resistance. There are five types of acrylonitrile content (%) in nitrile rubber: 42-46, 36-41, 31-35, 25-30, and 18-24. The more acrylonitrile content, the better the oil resistance, but the cold resistance will decrease accordingly. It can be used for a long time in the air at 120°C or in the oil at 150°C. In addition, it also has good water resistance, air tightness and excellent bonding performance. Widely used in the production of various oil-resistant rubber products, various oil-resistant gaskets, gaskets, sleeves, flexible packaging, soft hoses, printing and dyeing rubber rollers, cable rubber materials, etc., and become indispensable in industries such as automobiles, aviation, petroleum, and copying elastic material.
1. Performance Nitrile rubber is also called butadiene-acrylonitrile rubber, referred to as NBR, with an average molecular weight of about 700,000. Off-white to light yellow massive or powdery solid, relative density 0.95-1.0. Nitrile rubber has excellent oil resistance, second only to polysulfide rubber and fluorine rubber, and has excellent wear resistance and air tightness. The disadvantage of nitrile rubber is that it is not resistant to ozone and aromatic, halogenated hydrocarbons, ketones and ester solvents, so it is not suitable for insulating materials. The heat resistance is better than that of styrene-butadiene rubber and neoprene, and it can work at 120°C for a long time. Air tightness is second only to butyl rubber. The performance of nitrile rubber is affected by the content of acrylonitrile. As the content of acrylonitrile increases, the tensile strength, heat resistance, oil resistance, air tightness and hardness increase, but the elasticity and cold resistance decrease. Nitrile rubber has poor ozone resistance and electrical insulation properties, but good water resistance.
2 Main uses Nitrile rubber is mainly used to make oil-resistant products, such as oil-resistant pipes, tapes, rubber diaphragms and large oil bags, etc. It is often used to make various oil-resistant molded products, such as O-rings, oil seals, leather cups, diaphragms, valves , bellows, rubber hose, seals, foam, etc., are also used to make rubber sheets and wear-resistant parts.
3 Tips for improving the performance of nitrile rubber Oil resistance: By increasing the content of acrylonitrile, its oil resistance can be improved, but the cold resistance will decrease accordingly. It can be used for a long time in the air at 120°C or in the oil at 150°C. In addition, it also has good water resistance, air tightness and excellent bonding performance. Widely used in the production of various oil-resistant rubber products, various oil-resistant gaskets, gaskets, sleeves, flexible packaging, soft hoses, printing and dyeing rubber rollers, cable rubber materials, etc., and become indispensable in industries such as automobiles, aviation, petroleum, and copying elastic material. Improved cold resistance and low temperature resistance: Nitrile rubber has poor cold resistance, and its cold resistance becomes worse with the increase of acrylonitrile content. By using nitrile rubber with different acrylonitrile content and adjusting the combination of different anti-aging agents, reinforcing agents and plasticizers, a cold-resistant nitrile rubber formula with good oil resistance and fatigue resistance can be obtained.
Post time: Jun-16-2023