Now a lot of foam sealing strips on the market are produced using EPDM reclaimed rubber, they are anti-aging, high and low temperature resistance, with good sealing performance, deeply loved by consumers. The use of EPDM reclaimed rubber production foam seal, EPDM reclaimed rubber quality, curing time, curing temperature settings will affect the performance of the product, in addition, EPDM foam sealing strip formulations of the curing system The design of the EPDM seal foam rate and cell volume great influence.
Reclaimed rubber products formulated in the curing system mainly include curing agent, accelerator, activator three parts, EPDM renewable foam production of sealed foam is the same; under normal circumstances, the use of EPDM reclaimed rubber production foam seal , Sulfur vulcanization system is usually used, the choice of accelerator CZ and accelerator TMTD as vulcanization accelerator, the amount of sulfur and accelerator directly affect the physical properties of EPDM foam adhesive tape, the degree of foam:
1, EPDM foam reclaimed foam foam density increases with the increase of sulfur content, foaming rate, shrinkage, cell volume fraction and the cell diameter decreases, the three yuan B C recycled rubber material hardness and compressive strength increased significantly.
2, the amount of promoter will also affect the foaming properties of EPDM recycled rubber foam seal, different types of promoters have different effects: the amount of CZ-accelerator in EPDM foam sealing strip increases Foam density and cell diameter decreased, foaming rate and cell volume fraction first decreased and then increased, rubber shrinkage first increased and then decreased, compressive strength and hardness first decreased and then increased; EPDM The density of reclaimed rubber foam will increase with the increase of TMTD, the foaming rate and cell volume fraction will decrease, the shrinkage rate and cell diameter will first increase and then decrease, and EPDM Material compressive strength increased slightly decreased.
Understanding of the vulcanization system design of EPDM foam reclaimed rubber foam sealing strip physical properties, foaming performance of the mechanism of the seal strip products to improve performance, prolong the service life of great significance.
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