O-shaped rubber seals are widely used in hydraulic and pneumatic systems in various machinery, and play a good sealing role in static and reciprocating movements. In actual production, O-rings that need to be in contact with oil substances for a long time are generally processed with nitrile rubber as the main raw material; But the price of nitrile original rubber is very high, can it be mixed with reclaimed rubber? Which reclaimed rubber can be used in the production of nitrile oil-resistant O-rings?
1. Nitrile O-ring sealing ring is mixed with nitrile reclaimed rubber
Nitrile reclaimed rubber is made of waste nitrile rubber products as raw material desulfurization and regeneration, with the basic performance characteristics of nitrile rubber, good compatibility with nitrile rubber, large oil resistance coefficient, can be used alone or with nitrile rubber in any proportion to produce oil-resistant O-shaped rubber sealing ring, long-term contact with oil medium can maintain a good sealing effect, not easy to swell. Adjust the combined ratio of nitrile rubber and nitrile reclaimed rubber to meet the needs of more customers; Reduce costs and improve economic efficiency.
2. Nitrile O-ring sealing ring is mixed with natural reclaimed rubber
The combination of nitrile rubber and natural rubber can improve the processability, elasticity, tear resistance and low temperature resistance of nitrile rubber. As a low-cost option raw material for natural rubber, natural latex reclaimed rubber can be mixed into the O-ring formula with nitrile rubber 2SLYY1212 as the main material, and its effect is similar to that of natural rubber. When nitrile rubber is used together with natural rubber and natural reclaimed rubber to produce oil-resistant O-rings, it is necessary to reasonably control the mixing ratio of natural rubber or latex reclaimed rubber to better ensure the oil resistance of O-rings.
3. Nitrile O-ring sealing ring mixed with tire reclaimed rubber
Tire reclaimed rubber is a recycled rubber processed by sorting, cutting, crushing, sifting, desulfurization, refining and other processes of waste tires, and is the most widely used reclaimed rubber product on the market. The main components of tire reclaimed rubber are natural rubber, synthetic rubber (styrene-butadiene rubber, butadiene rubber, etc.) in carbon black, which can be mixed into the nitrile rubber O-ring formula in small amounts, effectively reducing the cost of raw materials and improving the wear resistance and aging resistance of the finished product.
When tire reclaimed rubber is mixed with nitrile O-ring formula, it is recommended to use ultra-fine tire reclaimed rubber produced by tires above 900, which has high fineness, good elasticity and small specific gravity, which is more beneficial to the finished product index of O-ring seals.
4. Nitrile rubber/nitrile reclaimed rubber is used to produce O-ring vulcanization formula
50 parts of nitrile rubber, 50 parts of nitrile reclaimed rubber, 4.5 parts of zinc oxide, 1.3 parts of stearic acid, 1.8 parts of antioxidant RD, 55 parts of silica, 8.5 parts, 0.8 parts of processing aid, 3.5 parts of silane coupling agent, 0.85 parts of accelerator DM, 2.65 parts of accelerator OTOS, 0.85 parts of vulcanizing agent TDTM, 0.85 parts of sulfur; total: 180.6 shares.
When using nitrile rubber as the main raw material to produce oil-resistant O-ring seals, rubber product manufacturers can also mix other varieties of reclaimed rubber, such as styrene-butadiene reclaimed rubber, EPDM reclaimed rubber, etc. In the future, Xiaobian will continue to discuss related issues with you, share the production formula of nitrile rubber/reclaimed rubber and use it to produce O-ring seals.
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