EPDM reclaimed rubber is made from EPDM die head rubber, unvulcanized EPDM rubber, or waste EPDM rubber products. It has excellent resistance to high and low temperatures, ozone resistance, and weather resistance. It can be used alone or combined with EPDM rubber to produce rubber sealing rings, reducing raw material costs. In actual production, why are more and more rubber sealing ring manufacturers starting to use EPDM reclaimed rubber? What issues should be noted during production?
1. Advantages of producing rubber sealing rings from EPDM reclaimed rubber
(1) Performance Advantages: EPDM reclaimed rubber retains the basic performance characteristics of EPDM rubber, including heat resistance, weather resistance, and ozone resistance. It meets the performance requirements of EPDM rubber sealing rings. The finished sealing rings have excellent sealing performance and long service life, widely used in automotive, construction, chemical, and other fields.
(2) Price advantage: EPDM reclaimed rubber is made from waste EPDM rubber and its products, and is much cheaper than EPDM base rubber. When fully or partially replacing EPDM rubber, raw material costs can be reduced by more than 20%.
(3) Processing advantages: Compared with EPDM base rubber, EPDM reclaimed rubber has better plasticity and flowability, unvulcanized rubber expands and shrinks less, and the finished product size is more stable. EPDM reclaimed rubber and EPDM base rubber can be used in any ratio. By adjusting the vulcanization system and reinforcing the filling system, it balances hardness, elasticity, and compression deformation, enabling the production of rubber sealing rings for different working conditions.
(4) Environmental and Economic Benefits: The raw materials for EPDM reclaimed rubber mainly come from discarded EPDM rubber products. Using it in reclaimed rubber production not only reduces production costs but also decreases environmental pollution and lessens the industry's dependence on new raw materials
2. Techniques for producing EPDM sealing rings with EPDM reclaimed rubber
(1) The proportion of recycled EPDM reclaimed rubber in the rubber sealing ring
When EPDM reclaimed rubber reclaimed rubber is used to produce rubber sealing rings, the reclaimed rubber dosage ratio is generally controlled at 30%-60%, and in sealing rings under harsh working conditions, the reclaimed rubber dosage ratio is appropriately reduced.
(2) Adjust the hardness of the EPDM reclaimed rubber sealing ring
Rubber sealing rings generate sealing stress through compression deformation, and if hardness is too low, air leakage is likely at high temperatures. When producing rubber sealing rings with EPDM reclaimed rubber, it is necessary to choose reclaimed rubber with appropriate hardness according to working conditions, and adjust the hardness of the rubber material through vulcanization and reinforcement and filling system designs.
(3) Reasonably design the formula for EPDM reclaimed rubber sealing rings
When producing rubber sealing rings mainly from EPDM reclaimed rubber, choosing a sulfur vulcanization system is relatively cost-effective and suitable for general-purpose sealing rings; EPDM reclaimed rubber with peroxide vulcanization has good heat resistance and low E6LYY62 of permanent compression set, making it suitable for producing high-performance rubber sealing rings. To further improve the mechanical strength and wear resistance of EPDM reclaimed rubber sealing rings, the amount of carbon black in the formulation can be appropriately increased. It should be noted that EPDM reclaimed rubber swells and fails when exposed to oily media, so it is not suitable for producing rubber sealing rings used in oily environments.
EPDM reclaimed rubber has excellent physical and chemical properties and is widely used in the production of sealing rings. When using EPDM reclaimed rubber to reduce the production cost of rubber sealing rings, choosing the appropriate reclaimed rubber formula and processing technology is crucial for improving the sealing performance, aging resistance, and mechanical strength of the sealing ring. When designing the formula for EPDM reclaimed rubber sealing rings, special attention must be paid to the type and amount of additives, as well as their compatibility with the reclaimed rubber, to ensure the overall performance of the final product.
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