Nitrile recycled rubber is generally made of waste nitrile rubber and its products as raw materials, and is made by crushing, desulfurization, kneading, sheeting and other processes, retaining the basic performance characteristics of nitrile original rubber, large oil resistance coefficient, good wear resistance and heat resistance, which can replace some nitrile rubber production products and reduce raw material costs. Rubber oil seals are used in the E5LYY91 rotary shaft seals of various machines, the main function is to prevent lubricating oil leakage, requiring the rubber material to have good oil resistance, generally processed with nitrile rubber as the main raw material. Can nitrile recycled rubber be used as an option raw material for high-priced nitrile original rubber? What issues should be paid attention to during use?
1. Can nitrile recycled rubber produce rubber seals?
Nitrile recycled rubber can produce rubber oil seals.
Rubber oil seals require that the rubber used has good oil resistance, can effectively resist the erosion of mineral oil, lubricating oil and other media, maintain a good sealing effect under long-term contact with oil substances, and is not easy to swell. The oil seal will cause friction with the shaft or other components during operation, so the compound is required to have good wear resistance and extend the service life of the oil seal. When the oil seal is running, frictional heat will be generated, so it is also required that the compound has good heat resistance.
Nitrile recycled rubber has good oil resistance, wear resistance and heat resistance, which can meet the basic performance requirements of rubber oil seals, so it can be used in the production of rubber oil seals.
2. What are the advantages of nitrile recycled rubber in the production of rubber oil seals?
(1) Cost advantage
At present, the price of mainstream grades of nitrile rubber on the market is among 15,000 yuan/ton and 17,000 yuan/ton, and the price of nitrile recycled rubber is among 5,500 yuan/ton and 7,500 yuan/ton. The price of nitrile recycled rubber is much lower than that of nitrile rubber, and the use of nitrile recycled rubber in rubber oil seals can effectively reduce the cost of raw materials.
(2) Performance advantages
In addition to the basic performance characteristics of nitrile rubber, nitrile recycled rubber also has the characteristics of plasticity, good fluidity, small expansion and contraction during processing of unvulcanized rubber, and less heat generation in processing, which can not only ensure the performance of oil seals in the production of rubber oil seals, but also improve the performance of rubber processing technology, reduce production energy consumption, and further improve the shape and size accuracy of finished oil seals.
3. Tips for using nitrile recycled rubber for rubber oil seals
(1) According to the specific physical properties of rubber oil seals, select nitrile recycled rubber with appropriate indicators; It is recommended to choose nitrile recycled adhesive with high glue content, high fineness, and no impurities to further improve the oil resistance and shape dimensional accuracy of the finished oil seal.
(2) Reasonably control the proportion of nitrile recycled rubber in rubber seals, generally among 10% and 50%, depending on the performance requirements and production process of the seals.
(3) Strictly control the quality of rubber raw and auxiliary materials. When nitrile rubber/nitrile recycled rubber is used to produce rubber oil seals, the quality of the rubber materials and rubber accessories used needs to be inspected, and they can only be used after passing the test.
(4) Reasonably design the formula of nitrile recycled rubber oil seal, fully consider the use environment of nitrile oil seal and its requirements for oil resistance, heat aging resistance, wear resistance, etc., as well as the impact of adding recycled rubber on the hardness, tensile strength, tear elongation and other physical properties of the rubber material, reasonably design the formula and adjust the formula appropriately to balance the performance and cost of nitrile rubber oil seal.
(5) Strictly control the production process parameters, especially the compounding and vulcanization processes, to ensure the dimensional accuracy and surface quality of the oil seal.
75% oil-resistant nitrile recycled rubber is made of nitrile gloves as the main raw material after crushing, desulfurization, filtration and refining, the product has a large oil resistance coefficient, good elasticity, high fineness, no impurities, smooth and bright surface of the product, high plasticity, good wear resistance, good aging resistance, is an ideal raw material for partially replacing nitrile original rubber to produce rubber oil seals, which can reduce the raw material cost by about 30% and the production cost by about 10% on average.
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