Nitrile rubber has excellent oil resistance, wear resistance, heat resistance and strong adhesion. It is mainly used in the production of oil-resistant rubber products and wear-resistant parts. In actual production, the price of nitrile rubber is high. In order to further reduce costs, many manufacturers will mix reclaimed rubber in nitrile rubber products, mainly nitrile reclaimed rubber. Reasonable control of the production process of nitrile rubber products and adjustment of the coordination system can improve product quality and production efficiency and reduce production costs. The editor today mainly discusses with you the key points and precautions for the processing of nitrile rubber/reclaimed rubber products.
1. Key points of nitrile rubber/reclaimed rubber combined to produce rubber products
The processing performance of nitrile rubber is basically similar to that of natural rubber. When nitrile rubber and reclaimed rubber are used together to produce rubber products, the nitrile rubber can be fully masticated and then mixed with reclaimed rubber.
Under normal circumstances, it is recommended to use low temperature plasticizing for high temperature nitrile rubber and nitrile rubber with high Mooney viscosity value, and then mixing after reaching a certain plasticity. When nitrile rubber/reclaimed rubber 2ELYY323 is masticated, low temperature, small roll distance and small capacity must be selected, and segmented mastication is appropriate. When low-temperature nitrile rubber and reclaimed rubber are used together, they can be directly kneaded. The heat generated during kneading is large, and the rollers need to be fully cooled. The temperature of nitrile rubber/reclaimed rubber and calendering with rubber needs to be lowered appropriately.
2. Combined use of nitrile rubber/reclaimed rubber to produce rubber products with elements
When nitrile rubber is used in combination with nitrile reclaimed rubber or other reclaimed rubber to produce rubber products, the addition of reclaimed rubber can improve the processing properties of the rubber to a certain extent, especially fluidity, plasticity, product dimensional stability, etc. Nitrile-butadiene rubber can also be used in combination with natural rubber, styrene-butadiene rubber, cis-butadiene rubber, ethylene-propylene rubber, neoprene rubber, chlorobutyl rubber, polyethylene resin, phenolic resin, etc. cost.
The combination of nitrile rubber/reclaimed rubber needs to choose suitable plasticizers and softeners to improve the process performance of the rubber compound and the low temperature performance of the vulcanizate; adding an appropriate amount of liquid nitrile rubber can further improve the process performance of the rubber compound. The vulcanization system can be a sulfur-accelerator system, or a low-sulfur, no-sulfur vulcanization system, peroxide vulcanization. When nitrile rubber/reclaimed rubber is used to produce rubber products, it is recommended to choose spray carbon black for reinforcement, which has better process performance and physical properties of vulcanized rubber; it is recommended to use white carbon black, hard clay and other fillers for light-colored rubber products. To improve the ozone resistance of nitrile rubber/reclaimed rubber, an appropriate amount of polyvinyl chloride can be used together, or an antiozonant can be used.
When using nitrile rubber/reclaimed rubber to produce rubber products, you must pay attention to the content of acrylonitrile: in theory, the higher the content of acrylonitrile, the worse the cold resistance. content of rubber. The content of acrylonitrile in nitrile rubber/reclaimed rubber is controlled 15%-50%, otherwise the rubber compound is too hard. Although increasing the acrylonitrile content is beneficial to improve the strength and wear resistance of the nitrile rubber/reclaimed rubber combination, the elasticity will decrease. We will have the opportunity to discuss related issues with you later.
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