NBR has the excellent oil resistance. Succinic dilute monomers can be copolymerized into CIS, trans and 1,2 Shao based three different chain structure. The typical structure of NBR in trans accounted for about 78%. Due to the molecular chain structure of NBR with cyano, oil resistance (such as mineral oil resistant, liquid fuel, vegetable oil and solvent) is superior to natural rubber, chloroprene rubber and styrene butadiene rubber. And other rubber compared to NBR have more broad range of using temperature, its long-term use temperature 120oc and NBR with good resistance to low temperature performance, low glass transition temperature up to -55oC.
NBR resistance, good chemical stability, good processing performance, with propylene refining nitrile content in the structure. The relative density increases, the vulcanization rate and improve the tensile strength, but the rebound performance decline, cold resistance becomes poor. Because NBR cyano easy polarization and dielectric performance of the semiconductor, rubber.NBR according to the ACN content, divided into high, high, high, medium and low 5 acrylonitrile production. Divided into continuous and batch polymerization. Two kinds of continuous polymerization method is usually used for less variety mass production and production, low consumption. Batch polymerization method is suitable for many varieties and small batch production, polymerization sign the use of less quantity, high consumption of construction. So far, still do not see the trend of.[1] substitutes
Nitrile butadiene rubber (NBR) although has excellent physical and mechanical properties, processing properties, but long-term performance than fluoride like glue and propylene acid cool glue used in the sour gas and high temperature (150oC) environment, for the German company, Canadian and Japanese companies to develop a performance excellent hydrogenation Ding nitrile rubber (HNBR). In addition, the development of the ultra cold resistance and high purity of nitrile rubber and carboxyl nitrile rubber (XNBR).
NBR performance
Basic performance
Nitrile rubber (NBR) is light brown elastomer, molecular Chu: 70 million, due to the strong polar CN groups, so the aliphatic hydrocarbon oil and petrol has excellent stability. And according to ACN containing feel different division:
High two coal cyanide rubber ACN content of more than 43%
The high content of acrylonitrile rubber ACN 36%-42%
In Binglian high wax content 31%-35% rubber ACM
The content of ACN in the middle two of the rubber 25%-30%
Low propylene nitrile rubber content was less than 24% ACN
Because NBR is a polar unsaturated carbon chain rubber, its coordination and processing are similar to butadiene rubber, the general character of unsaturated rubber, but it also has some characteristics of ACN group polarity.
General performance
Thermal stability of nitrile rubber better, its heat resistance than natural rubber, butadiene rubber and styrene butadiene rubber (SBR), long-term use temperature reaches 100oC, 120oc can use 40 days. [1]
Ozone tolerance than CR, better than NR
The better physical and mechanical properties and wear resistance of rubber were given.
When the acrylonitrile butadiene rubber content is 39%, air tightness with IIR rubber, good air tightness
The general low temperature flexibility
The excellent antistatic performance
The use of polar lipids plasticizing effect is good
With the polar material has good compatibility, such as PVC, with acid resin, nylon
The package series is not good, self-adhesive low, mixing process a large amount of heat
Excellent oil resistance
Nitrile rubber (NBR) is oil resistance, physical and mechanical properties and resistance to chemicals and other comprehensive performance excellent, one of the most representative rubber, effective use of these characteristics to meet a variety of uses. In general rubber, NBR rubber resistance to benzene, petroleum based oils and non polar solvent properties far superior to that of NR, SBR, IIR and other non-polar rubber, is superior to the polarity of the Cr, but polar solvents of nitrile rubber and extremely resistant to oil and the performance is not good enough. Figure 1-1 shows the nitrile butadiene rubber (NBR) and other rubber in the resistant status of heat and oil resistant rubber materials.
Main use
NBR because of its oil resistance and excellent mechanical properties, widely used in the manufacture of various oil resistant rubber products, such as the 0 ring, washer, hose and fuel tank lining, printing roller, tank lining, insulating ground Sook plate, oil resistant soles, hard rubber parts, fabric coating, pipe thread protection layer, pump impeller and wire wrapping, adhesive film for food packaging, rubber gloves and other areas of.2014, NBR production country in the world has more than 30, the largest consumer in the field is the production of oil resistant hose products and flame retardant conveyor belt, FT consumption accounts for about NBR of the total consumption of 53%. laminated nylon and butyl chloride rubber (AM) as the inner and outer layers, which can prevent the production of new hose freon gas effusion; using HNBR as inner rubber, nylon 66 as a reinforcing layer, using CSM as the abduction made cars. Power steering relies, in 12 (under the rC pulse can bear 4 million times. In addition nitrile Rubber or car Asahi CVT belt, Zhong tire, automotive and aircraft fuel like other materials ideal. Nitrile rubber in China mainly used in military, automotive, aviation industry, the oil tank and oil resistant parts such as Sook, is also used to seal, belt, hose and plastic modified materials. The amount is increasing year by year. Almost all existing hose factory and sundry goods factory are more or less using the NBR. second application fields is nitrile rubber sealing rubber products, widely used in aerospace devices, transformers, liquefied petroleum gas pipeline, gas FCL cover falling film, car type 0 aspects including automotive sealing glue sealing check about the total volume of consumer products 50%. in China every year for the inspection of nitrile glue wire and cable products is about lOOOt. by dynamic vulcanization technology and the compatibilization technology can be made of NBR/PP, NBR/PS, NBR/PVC > NBR/PA, NBR/ACR, NBR/CSM, NBR/, EPDM, NBR/BR and other new Metallic materials, has good market before he.NBR using for high Shan plywood, printing rubber roller, mine fire resistant hydraulic hose, oil tank, Shan box, Sheng Shan sacrifice, resistant to oil and rubber shoes etc.. [1]
Limb Xingshan abroad, mainly used in aviation, automotive, printing, textile and machinery manufacturing industry. Due to the modified by NBR varieties development, expand the nitrile rubber application prospect. Summarized up the main Playing: manufacturing Rao box, fuel oil, oil cloth, oil seal, gas pipe, oil resistant rubber parts with and with Shan contact of a variety of products and so on. Nitrile rubber and PVC, cool acid resin has good compatibility, so often and resin blend materials modification. Welcome often use PVC to improve the processing performance and impact resistance performance; the use of hope formaldehyde resin to obtain Rao, materials, manufacturing asphalt mixing flow of materials.
Nitrile rubber is mainly used for production of oil products, such as the oil pipe, tape, rubber diaphragm and large oil sac, etc., commonly used in the production of various types of oil resistant molded products, such as O-ring, oil seal, cup, diaphragm, valve, corrugated pipe, hose, seal, foam, etc., and can also be used to make blankets and wear parts.