Today's KNOWLEDGE Share : Tackifiers in Tire Manufacturing

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Today's KNOWLEDGE Share

Tackifiers in Tire Manufacturing

* Tack is considered the ability of two uncured rubber compound surfaces to adhere together. Because most synthetic rubbers are less tacky than natural rubber, it is often necessary to add tackifying substances. These substances should give rubber compounds sufficient tack that is maintained during storage and facilitate processing, in order that the components of a green tire will hold together until the curing process and prevent tearing during molding in the curing press.


* Changes in environmental conditions can dictate adjustments to the tackifier level. For instance, in hot summer months, you might need to decrease the tackifier to prevent the compound from becoming too sticky. Conversely, in cold months, it might be necessary to increase the tackifier to ensure sufficient adhesion is maintained. Therefore, tack properties must be optimized to avoid possible defects due to unsuitable tack levels.


* Tackifying resins generally have a softening range of 80°C to 110°C and should be incorporated early in the mixing cycle (masterbatch) to ensure proper dispersion.


* One of the preferred tackifier resins in tire manufacturing is phenol resin. General tackifying resins form weak Van der Waals forces, through which tackiness forms, whereas phenolic resins form stronger hydrogen bonds with the rubber surface so with lower loading , the compound achieves sufficient tack.


source : Ahmed Awad

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