Nitrile rubber has excellent oil resistance and can be used alone or in combination with nitrile rubber to produce oil resistant and wear-resistant rubber products, effectively reducing raw material costs; However, nitrile rubber and nitrile recycled rubber have poor cold resistance, and their application range is limited to some extent. After vulcanization, butadiene rubber has excellent cold resistance, wear resistance, and elasticity. Therefore, it can be combined with an appropriate amount of butadiene rubber to improve the comprehensive performance of the rubber material and expand its application range.
When using nitrile rubber and butadiene rubber together to produce rubber products, it is recommended to control the dosage of butadiene rubber at around 20 parts; When there are strict requirements for cold resistance, wear resistance, and fatigue resistance, and low requirements for oil resistance, the amount of butadiene rubber used can exceed 20 parts. With the increase of the proportion of butadiene rubber blend, the brittleness temperature and wear resistance of nitrile rubber/butadiene rubber blend are improved, while the tensile performance and tear strength decrease. The volume expansion rate of vulcanized rubber in oil medium increases, and the physical properties decrease after oil resistance test.
The preparation and formulation of nitrile rubber/butadiene rubber blends are directly related to their physical properties, especially the vulcanization system and reinforcement system.
In actual production, the mechanical properties and elasticity of vulcanized rubber with sulfonamide type accelerators are better when used in combination with nitrile rubber and cis-1,4-polybutadiene rubber. The mechanical properties of vulcanized rubber with thiazole type accelerators M and DM are lower than those with hyposulfonamide type accelerators; When using a combination of nitrile rubber and cis-1,4-polybutadiene rubber as accelerator, the rubber material is prone to scorching.
Carbon black is the most commonly used reinforcing filler in the production of rubber products. According to the manufacturing method, it can be divided into furnace carbon black, trough carbon black, drum carbon black, Contact process carbon black, pyrolysis carbon black, spray carbon black, etc. When using furnace method carbon black reinforcement for nitrile recycled rubber/cis-1,4-polybutadiene rubber composite, it can endow the composite with good process properties, mechanical properties, rebound resistance, wear resistance, and better overall performance; The processing performance of the rubber material using slot method carbon black is poor, while the mechanical performance of the rubber material using hot cracking method carbon black is low.
When using nitrile rubber as the main raw material to produce rubber products, a moderate amount of cis-1,4-polybutadiene rubber can further improve the cold resistance, wear resistance, and elasticity of the rubber material. In practical production, nitrile rubber and nitrile recycled rubber can also be used to improve the tear resistance of cis-1,4-polybutadiene rubber, such as in the production of automotive tires. In the future, the editor will continue to share with you the precautions for using nitrile recycled rubber to improve the comprehensive performance of polybutadiene rubber products.
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