Introduction to the material application of NBR.

  Resistant hydraulic oil rubber O-ring material is mainly dominated by NBR rubber material, NBR rubber hydraulic O-ring has good oil resistant properties and NBR Ding clear adhesive wear resistance, resistance to deformation is good. Because it is the price of NBR rubber material of rubber price lowest, so it is widely used.

Oil resistance usually refers to non polar oils, fuel oil, mineral oil and synthetic oil.

Nitrile rubber hydraulic O-ring ability most oils, especially in resistance to the paraffin oil, oil is divided into two, alkane and aromatic oils, paraffin oil is refers to the molecular structure for the chain, and the aromatic oil is refers to the molecular chain containing benzene ring structure of oil, such as common petrol, oil, diesel oil, peanut oil, soybean oil and belong to the alkane oil.The pine tar and coal tar oil and so on are aromatic oil.The is still relatively easy to understand, NBR rubber molecular chains containing CN (cyano) groups, polarity rubber, and a straight chain alkane oil molecular chain, no polar groups is non polar structure and aromatic oil containing benzene ring structure, but also showing a strong polarity, is the so-called "compatible" principle.

  NBR hydraulic O-ring with its excellent oil resistance and the oil resistance after polysulfide rubber, acrylate rubber and fluorine rubber, in addition to NBR hydraulic O-ring also has good abrasion resistance, aging resistance and air tightness, but resistant to ozone, electrical insulation and cold tolerance are poor, and conductive performance better.NBR hydraulic O-ring production process has the following characteristics:

1.Monomer propylene clear polarity strong, resulting in the polymerization process in the latex is not stable, the amount of propylene fine, the stability of the latex is worse.

2.Medium of alkaline or acid too strong or temperature is too high will cause a cyano hydrolysis polymerization, namely: acid production will destroy the emulsifier and as a result, the latex instability of one of the reasons.

3.Hydrolysis reaction intermediate amide and polymer chains in the cyano group at higher temperatures, may by the crosslinking reaction, so that product quality deterioration.

4.NBR hydraulic O type of butadiene and propylene fine polymerization rate is quite different (at 40 C, respectively, 0.02 and 0.3), therefore, the composition and distribution of monomer, the dependence on the conversion rate is relatively large.By way of batch addition of acrylonitrile can improve the distribution of cyano group.NBR rubber because of strong molecular chain reaction force, hardness, it is difficult to process more difficult, in which the polymerization temperature of 30 degrees Celsius is the most difficult to process, need to be pre plastic in the cold roll to operate.The industrial use of more effective way to regulate the molecular weight of the method and the polymerization temperature to 5 degrees Celsius, in order to reduce the side effects to improve its processing performance.On the other hand, NBR rubber through and a variety of rubber chloroprene rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber and so on and synthetic resin such as polyvinyl chloride, phenolic resin blend (see polymer blends) performance is improved.

   If hydraulic o ring only smear oil in procession of product, that’s ok choosing NBR. Our company is professional in product and sealing NBR o ring , and we have many kinds of sizes, stock, quality is great. NBR is oil resistance, corrosion resistance, under 100 degree if works for a long time.If the rubber must touch some chemical substances,etc. I suggest you choose VITON, but its price is higher than NBR. VITON is mainly chemical resistance, acid resistance, oil resistance, corrosion resistance, under 220 degree if uses it for a long time.If the chemical stability can not meet the requirements, the structure of rubber will change because of the chemical action of oily medium, so it also changes other physical property.: Performance of strength, deformation, hardness, elastic will be decreased., or loose all. Above all, oil resistance is the most important.