When you mention EPDM reclaimed rubber, you have to say it has excellent aging resistance. EPDM reclaimed rubber has good resistance to high temperature, low temperature, ozone, chemicals, etc. It has stronger ability to use and has longer service life in various special environments. So isn't EPDM reclaimed rubber do not need to add anti-aging agent when producing rubber products? What are the skills of EPDM reclaimed rubber products in designing anti-aging systems?
All of EPDM reclaimed rubber has good aging resistance, because it retains most of the internal molecular structure characteristics of EPDM rubber. The EPDM molecular chain is saturated, with only a very small amount of unsaturation. In the side chain, the formation of active free radicals is difficult. The oxidation and aging of EPDM reclaimed rubber mainly affect the side-base. Above these two points, EPDM reclaimed rubber has excellent oxidation and ozone resistance. performance. When EPDM recycled rubber is used to produce rubber products, antioxidants are generally used only for products that require particularly high heat and aging resistance.
1, the use of free radical scavengers
Under normal circumstances, EPDM reclaimed rubber products are added with anti-aging agents to improve the heat resistance of products, such as auto radiator hoses and plate heat exchanger hoses made of EPDM recycled rubber. While reducing the amount of sulfur or using peroxide as a vulcanizing agent, it is better to use an appropriate amount of free radical scavenger to improve the heat resistance of EPDM reclaimed rubber products.
The radical scavenger is a substance that can interact with living radicals to form stable free radicals or stable molecules, such as antioxidant RD, antioxidant BLE, antioxidant 264, etc., and can also be used together with a small amount of anti-aging synergist such as MB. , To further improve the heat resistance of EPDM recycled rubber products. In actual production, EPDM recycled rubber products vulcanized with sulfur vulcanization system are usually the most commonly used anti-aging agent RD and MB in combination with anti-aging system; EPDM rubber products vulcanized with peroxide as vulcanizing agent Among them, the free radical scavenger affects the vulcanization process of the reclaimed rubber. Therefore, quinoline anti-aging agents that have little effect on the vulcanization process are often used.
2, phenolic antioxidants
Phenolic antioxidants are non-polluting antioxidants, such as 2246, but its protective effect is not as good as amine antioxidants. Therefore, in the process of use, more than two antioxidants are selected to provide protective effects. C phenolic antioxidants are needed in recycled rubber products and export rubber products.
The use of EPDM reclaimed rubber instead of EPDM rubber products can significantly reduce the cost of raw materials. EPDM reclaimed rubber with high gel content and excellent aging resistance is an ideal choice for rubber product manufacturers. When using EPDM reclaimed rubber to produce rubber products, in order to ensure the service life of rubber products, rubber product manufacturers must be cautious when selecting anti-aging systems.
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