Nitrile reclaimed rubber has excellent oil resistance. It can be used alone or in combination with nitrile rubber to produce various oil-resistant rubber products to suit different applications. In actual production, the setting of nitrile reclaimed rubber vulcanization system directly affects the oil resistance of vulcaniz The vulcanization system guarantees the oil resistance and service life of oil-resistant nitrile reclaimed rubber products.
1. The theoretical basis for the vulcanization system to improve the oil resistance of nitrile reclaimed rubber
As the crosslinking density of the rubber compound increases, the intermolecular force of the rubber increases, and the free volume in the network structure decreases. It has the characteristics of difficulty for oil to diffuse. Therefore, increasing the crosslinking density of the nitrile reclaimed rubber can significantly improve the oil resistance of the vulcanized rubber. sex. .
2. The effect of cross-linking bond type on the oil resistance of nitrile reclaimed rubber vulcanizate
When using nitrile reclaimed rubber to produce oil-resistant rubber products, the type of cross-linking bond affects the oil resistance of the reclaimed rubber is closely related to the type of oil and the temperature. Nitrile reclaimed rubber 2YLYY915 products used in oxidized fuels are recommended to be vulcanized with peroxide or semi-effective vulcanization system. The oil resistance of vulcanized rubber is better than that of sulfur vulcanized rubber. Nitrile reclaimed rubber products used in mineral oil at 150°C are recommended to be vulcanized with cadmium oxide and sulfur vulcanization system. Nitrile reclaimed rubber vulcanizate has relatively better heat-resistant oil aging performance.
It should be noted that the peroxide-cured nitrile reclaimed rubber vulcanizate has the highest stability at 40°C, and its oil resistance cannot reach the ideal value in oxidized fuel at 125°C.
3. How to cooperate with the vulcanization system and the reinforcement system to improve the oil resistance of nitrile
Carbon black and white carbon black are commonly used reinforcing fillers in oil-resistant nitrile reclaimed rubber products. In actual production, when nitrile reclaimed rubber chooses carbon black for reinforcement, it is recommended to choose cadmium oxide/sulfur vulcanization; when using semi-reinforced white carbon black to fill nitrile reclaimed rubber, it is recommended to use CdO/S donor + HVA ( M-phenylene dimaleimide) vulcanization.
To improve the oil resistance of nitrile reclaimed rubber products, it is not only necessary to select a suitable vulcanization system, but also to design a reinforcement filling system, a softening system, and an anti-aging system, etc., to reduce more raw material costs and production energy consumption while ensuring the oil resistance of the product.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits