The rubber railbearing pad has excellent elasticity and insulation, which can effectively buffer the high-speed vibration and impact generated when the train passes the rail, protect the roadbed and railbearings, and at the same time insulate the signal. In actual production, natural rubber, styrene-butadiene rubber, cis-butadiene rubber, neoprene rubber, nitrile rubber, etc. can be used to produce rubber railbearing pads; among them, nitrile rubber is mostly used for oil-resistant and cold-resistant railbearing pads, and nitrile is mixed in an appropriate amount. Reclaimed rubber can effectively reduce costs.
1. Application skills of nitrile reclaimed rubber in oil-resistant railbearing pads
In actual production, nitrile rubber can be used alone or in combination with an appropriate amount of styrene-butadiene rubber to produce oil-resistant railbearing pads, with excellent oil-resistant performance. Nitrile-butadiene reclaimed rubber retains the basic performance characteristics of nitrile-butadiene rubber, and can replace a part of nitrile-butadiene rubber and nitrile-butadiene rubber, nitrile-butadiene rubber/styrene-butadiene rubber to produce oil-resistant railbearing pads, effectively reducing the cost of raw materials.
When using nitrile rubber/nitrile reclaimed rubber combined rubber or nitrile rubber/styrene-butadiene rubber/nitrile reclaimed rubber combined rubber to produce oil-resistant railbearing pads, a sulfur-accelerator system can be used, it is recommended to choose insoluble sulfur, with accelerators TMTM, CDD, etc., appropriate amount of zinc oxide and stearic acid are added. The reinforced filling system can be reinforced with carbon black and filled with clay, in which carbon black N774 can endow the vulcanizate with high elasticity, low heat generation and good dynamic properties. It is recommended to use coumarone resin to soften oil-resistant railbearing pads containing nitrile reclaimed rubber, which has multiple functions of softening, tackifying and reinforcing. Combine chemical antioxidants and physical protective waxes to prolong the service life of oil-resistant railbearing pads.
2. Application skills of nitrile reclaimed rubber in oil-resistant and cold-resistant railbearing pads
The oil resistance and cold resistance of nitrile rubber are closely related to the content of acrylonitrile in the rubber. Generally, the higher the content of acrylonitrile, the better the oil resistance of nitrile rubber, and the corresponding decrease in cold resistance. When using nitrile rubber 2ELYY715 as the main raw material to produce oil-resistant and cold-resistant rubber railbearing pads, it is recommended to select nitrile rubber with appropriate acrylonitrile content; appropriate amount of nitrile-butadiene reclaimed rubber is used to reduce the raw material cost and production energy consumption of oil-resistant and cold-resistant railbearing pads.
When nitrile rubber/nitrile reclaimed rubber is used to produce oil-resistant and cold-resistant railbearing pads, a sulfur-accelerator system is generally used. Accelerators such as DM and TMTD can be used in combination, and zinc oxide and stearic acid can be added in an appropriate amount. In the reinforcing filling system, carbon black and silica can be used together. Carbon black N550 can give the rubber compound higher stiffness, high temperature resistance and good thermal conductivity. Silica can improve the tear resistance and heat resistance of the rubber compound. Aging. Nitrile rubber/reclaimed rubber oil-resistant and cold-resistant railbearing pad softening and plasticizing system is recommended to use cold-resistant plasticizers such as dioctyl sebacate, which has high plasticizing efficiency and low volatility, and vulcanized rubber has better cold resistance, heat resistance and electrical insulation. it is good. In oil-resistant and cold-resistant railbearing pads containing nitrile reclaimed rubber, two or more antioxidants are used together, such as MB/RD, which has better aging resistance.
When using nitrile reclaimed rubber to reduce the production cost of oil-resistant and cold-resistant rubber railbearing pads, rubber product manufacturers must mix reclaimed rubber in an appropriate amount on the premise of ensuring product quality, and reasonably adjust the formula of oil-resistant and cold-resistant railbearing pads. The editor will continue to discuss with you later. question.
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