In the hot summer days, especially in hot weather, EPDM reclaimed rubber cannot maintain its “coolness” in high temperature environment. The physical indicators will decline linearly, including reclaimed rubber tensile strength, elongation at break, hardness, etc. The most intuitive performance is the hardness of EPDM reclaimed rubber: We can use the instrument to test out the summer EPDM reclaimed rubber “softens”. Why? What is the reason for the decrease in the hardness of EPDM reclaimed rubber in summer?
In summer, the hardness of EPDM reclaimed rubber is reduced. The main reason is that the summer temperature is too high, which results in the acceleration of the internal thermal movement of EPDM regenerated rubber molecules and the reduction of intermolecular forces. The hardness of reclaimed rubber naturally decreases.
In addition, during the storage process of EPDM reclaimed rubber, the accelerating agent and vulcanizing agent in the rubber compound will slowly decompose and release, which will also lead to the weakening of the interaction force among the EPDM rubber molecules. Yuan ethylene propylene reclaimed rubber hardness. The reduction of the hardness index of EPDM reclaimed rubber directly affects the performance of EPDM reclaimed rubber products. Therefore, in order to ensure product performance, manufacturers can make preventive measures in advance in the storage process to prevent the impact of changes in EPDM reclaimed rubber. Product performance, EPDM reclaimed rubber products that have undergone index changes, can be adjusted to make up for the performance impact of index changes on the product.
1 Storage: In the process of storing reclaimed rubber in summer, it is necessary to keep the environment of EPDM reclaimed rubber parking cool, dry and ventilated; if the temperature in the warehouse is too high, appropriate cooling measures should be taken, and the best temperature for reclaimed rubber storage in summer. Is 26 °C; summer EPDM reclaimed rubber storage should also pay attention to moisture, it is best to store off the floor.
2 Adjustment formula: The hardness of EPDM reclaimed rubber is directly related to the use performance of reclaimed rubber products. For example, the hardness directly affects the sealing performance of EPDM seals, and the higher the hardness is, the higher the EPDM reclaimed rubber production is. Sealing products better sealing effect; hot summer EPDM reclaimed rubber hardness has been reduced, so the high hardness of the reclaimed rubber products need to adjust the formula to increase the hardness of ethylene propylene recycled rubber products. The cross-linking density of the reclaimed rubber compound can be increased by reinforcing and plasticizing, or the rubber content of the reclaimed rubber product formulation can be increased, and the hardness stability of the EPDM reclaimed rubber product can be guaranteed as much as possible.
The EPDM reclaimed rubber is stored and used in different seasons, and the indicators will change. The rubber product manufacturers must pay attention to these changes and adjust the formula in time.
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