Nitrile reclaimed rubber has excellent oil resistance, good wear resistance, and heat resistance. It can be used alone or combined with nitrile rubber to produce various rubber products. When using nitrile reclaimed rubber to produce rubber products, reasonable formulation design can achieve the required performance while effectively reducing raw material costs. When designing the formula for nitrile reclaimed rubber products, to achieve a balance among cost control, processing stability, and finished product quality, the following issues must be considered.
1. Purpose of reasonably designing the formula for nitrile reclaimed rubber products
Designing the formulation for nitrile reclaimed rubber products essentially involves adding certain types and quantities of additives to the combined adhesive of nitrile reclaimed rubber or nitrile rubber/nitrile reclaimed rubber to achieve the required performance of the rubber product. The main objectives are as follows: (1) to meet or improve the performance of nitrile reclaimed rubber; (2) Improve the processing technology of nitrile reclaimed rubber to facilitate operation and meet the needs of large-scale production; (3) Without affecting or reducing performance impact, appropriately increase the amount of reclaimed rubber or use fillers to reduce production costs.
2. Issues that must be considered when designing the formulation of nitrile reclaimed rubber products
(1) Consider the compatibility of nitrile reclaimed rubber and rubber additives
When designing the formulation for nitrile reclaimed rubber products, it is essential to ensure that the additives and nitrile reclaimed rubber have good compatibility, and that the additives can remain in the nitrile reclaimed rubber for a long time, stably, and uniformly.
(2) Consider the migration and aging resistance of additives in nitrile reclaimed rubber products
When choosing additives for nitrile reclaimed rubber products, it is required that easily migrating components such as antioxidants and plasticizers in the formula must not exhibit significant volatilization, extraction, or migration during long-term use. Especially for nitrile reclaimed rubber products that require prolonged contact with mineral oil or use in high-temperature environments, the NBR vulcanization system, reinforcing fillers, and other additives must have good anti-aging properties.
(3) Consider the adaptability of the additives in nitrile reclaimed rubber products to processing conditions
When designing the formulation of nitrile reclaimed rubber products, the additives used must not decompose at processing temperatures, and are not easily volatile or sublimated. For example, the vulcanizing agent for reclaimed rubber must maintain stable chemical properties within the processing temperature range of the nitrile reclaimed rubber E6LYY119, avoiding premature decomposition, volatilization, or sublimation during mixing or vulcanization due to excessive temperature. Insufficient heat resistance of additives in nitrile reclaimed rubber formulations not only causes loss of active ingredients and reduced crosslinking efficiency but also leads to scorching of the compound, seriously affecting the production efficiency and yield of nitrile reclaimed rubber products.
(4) Consider the limitations of the use of nitrile reclaimed rubber products on additives
Nitrile reclaimed rubber products for different usage scenarios have certain requirements for the appearance, odor, pollution resistance, durability, electrical performance, weather resistance, and toxicity of additives. When designing reclaimed rubber product formulations, it is necessary to choose rubber additives that meet specific industry standards and environmental regulations while meeting the basic physical properties of the products.
(5) Consider the synergistic and antagonistic effects of additives in nitrile reclaimed rubber products
When producing rubber products mainly from nitrile reclaimed rubber, it is best for the compound to have synergistic effects among the compound and the additives, and among the additives themselves, avoiding antagonistic effects that weaken the original effects of each compound. For example, antioxidant D and WSP can both make a synergistic effect with antioxidant MB, resulting in better anti-aging effects; Ignoring the antagonistic effects among components may significantly weaken the effectiveness of certain additives; for example, peroxide vulcanization systems should avoid acidic or reactive functional group fillers.
When producing rubber products with nitrile reclaimed rubber, formulation design is the primary technical issue in reclaimed rubber processing applications. It is not only the main way to achieve the required performance of the product, but also the starting point and summary of reclaimed rubber processing and application technology. A reasonable formulation design for nitrile reclaimed rubber products ensures excellent performance, low processing and production costs for rubber materials, and achieves good economic and social benefits.
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