Nitrile reclaimed rubber has excellent oil resistance, good wear resistance and aging resistance, and can be used alone or combined with nitrile rubber, neoprene, etc. to produce oil-resistant and wear-resistant rubber products, effectively reducing the cost of raw materials. In actual production, nitrile reclaimed rubber can be used in the production of sealing products such as oil seals, O-rings, sealing strips, sealing gaskets, etc., and different varieties of sealing products have different rubber formula designs.
1. Key points of formula design of oil seal rubber for the production of nitrile reclaimed rubber
Oil seals are required to have good oil resistance, aging resistance, wear resistance, low compression set, and appropriate hardness (75±5). When using nitrile reclaimed rubber to produce oil seals, low-sulfur and high-promotion vulcanization systems, peroxide vulcanization systems, composite vulcanization systems, cadmium-magnesium vulcanization systems, etc., are mostly used to improve the heat aging resistance of nitrile reclaimed rubber. The use of reinforcing carbon black, or the combination of it with other carbon blacks, can improve the oil resistance, aging resistance, physical and mechanical properties, and compression set resistance of the compound. Appropriately increasing the amount of silica can improve the heat resistance of the rubber compound.
2. Key points of the formula design of O-ring rubber for the production of nitrile reclaimed rubber
O-ring requires the rubber used to have good tensile properties, tensile strength, good oil resistance, heat aging resistance, low compression set, and the O-ring rubber used for dynamic sealing also needs to have good wear resistance.
When using nitrile reclaimed rubber to produce O-ring rubber compounds, low-sulfur and high-promotion vulcanization systems or peroxide vulcanization systems can be used, and vulcanized rubber has good compression set resistance. Polyfunctional compounds can be used as co-crosslinkers for peroxides in high-hardness compounds. In the nitrile reclaimed rubber O-ring reinforcement filling system, the appropriate amount of spray carbon black E4LYY86 is used, and the compression and permanent deformation of vulcanized rubber is small and the heat generation is low. The high-hardness rubber compound can be used in combination with spray carbon black, high wear-resistant carbon black, groove carbon black, and fast-pressed carbon black, and the vulcanized rubber has small compression and permanent deformation and large elongation. The use of low molecular weight polyethylene as a processing aid can significantly improve the heat generation, scorching and extrusion performance of high hardness and medium hardness rubber of nitrile reclaimed rubber during processing.
3. Key points of the formula design of sealing strip rubber for the production of nitrile reclaimed rubber
Oil-resistant rubber sealing strips require the rubber used to have good oil resistance, abrasion resistance, heat resistance, aging resistance, as well as good elasticity, tensile strength and compression set resistance. When producing sealing strip rubber with nitrile reclaimed rubber, ordinary sulfur vulcanization system, semi-effective vulcanization system or peroxide vulcanization system can be used; The reinforcing filling system can be reinforced with carbon black N330, spray carbon black, light calcium and clay; Appropriate use of supporting compounding agents, such as ointment, polymer wax modified plastics, etc., the finished rubber material has good stiffness and small deformation.
In the production of rubber sealing products, the rational use of nitrile reclaimed rubber can not only ensure the good oil resistance and wear resistance of the product, but also effectively reduce the cost of raw materials and production energy consumption. Subsequently, Xiaobian will share with you the application skills of nitrile reclaimed rubber in other rubber sealing products.
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