Highly elastic oil-resistant rubber pads require good oil resistance and are ideal for use as seals, buffers or shock absorbers in environments subjected to pressure, vibration and shock. As a low-cost option raw material for nitrile original rubber, nitrile reclaimed rubber can be used alone or combined with nitrile rubber to produce high-elastic and oil-resistant rubber pads; Rational design of the formula can further optimize the quality of the finished product of the oil-resistant rubber pad while reducing costs.
1. Performance requirements of high-elastic oil-resistant rubber cushion blocks
(1) High elasticity: It can quickly restore its original shape and provide good cushioning and shock absorption effect.
(2) Oil resistance: It has good resistance to a variety of oils, and the rubber cushion block is not easy to swell or deform.
(3) Abrasion resistance: It has a long service life under friction conditions.
(4) Aging resistance: It can resist the influence of ultraviolet rays, ozone and chemicals, and maintain stable performance.
(5) Temperature resistance: keep the performance unchanged in a certain temperature range, usually the oil-resistant rubber pad block can be used in the temperature range of -30°C to 100°C.
2. Key points of vulcanization formula design for the production of high-elastic and oil-resistant rubber cushion blocks of nitrile reclaimed rubber
(1) Raw rubber system: the high-elastic oil-resistant rubber cushion needs to be quickly restored to its original state during use, and the rubber material is required to have good elasticity; Therefore, when choosing nitrile reclaimed rubber, it is recommended to choose reclaimed rubber products with high nitrile content, and if necessary, an appropriate amount of nitrile primary rubber can be added to improve the elasticity of oil-resistant rubber cushions, which can provide better cushioning and shock absorption effects when used.
(2) Vulcanization system: increasing the cross-linking density can improve the oil resistance of nitrile reclaimed rubber vulcanizing agent. In actual production, nitrile reclaimed rubber can be vulcanized with ordinary sulfur vulcanization system, semi-effective vulcanization system, peroxide vulcanization system, etc. When the nitrile reclaimed rubber oil-resistant rubber cushion works in oxidized fuel, it is recommended to use peroxide or semi-effective vulcanization system for vulcanization; Low-temperature oil-resistant rubber pads can be vulcanized with DCP and a small amount of sulfur.
(3) Filler system: Generally, the higher the activity of the filler (such as carbon black and silica) and the stronger the binding force among the rubber and the smaller the volume swelling of the vulcanized rubber. Appropriately increasing the amount of filler is helpful to improve the oil resistance of nitrile reclaimed rubber high-elastic oil-resistant rubber cushions.
(4) Softening system: When using nitrile reclaimed rubber as the main raw material to produce high-elastic and oil-resistant rubber cushion formula, it is recommended to choose a softening plasticizer with large molecular weight, low volatility and not easy to be extracted by oil, and it is best to choose low-molecular polymers, such as low-molecular weight polyethylene, oxidized polyethylene, coumarone, polyester plasticizers and liquid rubber. Softeners and plasticizers with high polarity and relative molecular weight are good for oil resistance, while esters are easy to be pumped out by fuel.
(5) Protection system: when producing high-elastic oil-resistant rubber cushion blocks with nitrile reclaimed rubber, it is necessary to consider the problem of thermal and oxidative aging, and the antioxidant in oil-resistant rubber is very important for its stability in oil, so it is recommended to choose an antioxidant with low solubility in oil, such as acrylamide phenolic antioxidant.
When using nitrile reclaimed rubber as the main raw material to produce high-elastic and oil-resistant rubber cushions, it is necessary not only to adjust the vulcanization formula of reclaimed rubber, but also to adjust the production process, and then continue to discuss related issues with you.
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