Nitrile rubber has the characteristics of excellent oil resistance, abrasion resistance, heat resistance, water resistance, air permeability resistance, and strong adhesion. It has a wide range of applications in the automotive, aviation, petroleum, and copy industries, including oil-resistant rubber products and wear-resistant products. , Foam products, flame retardant products, etc. Different nitrile rubber products are used in different environments. The nitrile rubber products that work in special occasions have more stringent requirements on the metal corrosion, resistance properties, flame retardancy, foaming performance, and abrasion resistance of the rubber. How to meet the special performance requirements of nitrile rubber products?
1. Metal corrosiveness
The basic idea to improve the metal corrosion of nitrile rubber products is to keep nitrile rubber products with good water resistance and no blooming. Choose nitrile rubber with better water resistance; use less or no sulfur in vulcanization system 2YLYY927, and use thiazole accelerator or thiuram accelerator; The resistance of nitrile rubber products to metal corrosion.
2. Copper corrosion
Improve the copper corrosion of nitrile rubber products and reduce the amount of sulfur compounds. In the vulcanization system, the influence of sulfur compounds is suppressed. Below 80℃, the amount of sulphur is reduced to less than 0.5 parts. Above 80℃, it is recommended to use propylene oxide for vulcanization. Tetramethylthiuram disulfide will also affect the nitrile rubber compound. The copper is corrosive. Adding an appropriate amount of imidazole is also prescribed to reduce copper corrosion. From the perspective of process operation, it is recommended to use two-stage vulcanization to improve the resistance of nitrile rubber to copper corrosion.
3. Water resistance
When the nitrile rubber products are in contact with water for a long time during the working process, the rubber product manufacturers should reduce the electrolyte in the rubber and control the water absorption. In actual production, to improve the water resistance of nitrile rubber, you can choose nitrile rubber with good water resistance; in the reinforcement and filling system of nitrile rubber products, try to avoid using carbon black and calcium carbonate with high water resistance; guarantee in the vulcanization system The rubber is fully vulcanized, and it is recommended to increase the amount of sulfur; in addition, the performance of zinc oxide decreases at high temperatures. This point requires special attention when improving the water resistance of nitrile.
In actual production, the metal corrosion resistance of nitrile rubber products is closely related to water resistance. By controlling the moisture absorption and other methods to improve the water resistance of the rubber compound, the metal corrosion resistance can also be improved. In addition, when nitrile rubber is vulcanized with sulfur, residual sulfur compounds can also cause corrosion, so the use of peroxide can significantly improve this problem. In the next issue, the editor will continue to share with you the methods to improve other special performance requirements of nitrile rubber products.
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