Why Does Silicone Migrate (Contaminate) the PSA Surface?


Transparent release film with different release force

In the structure of the release liner, silicone acts as a separation from the pressure-sensitive adhesive.

Silicone Oil Transfer

Silicone Oil Transfer

Depending on the degree of curing, there are always more or less silicone oil free radicals in the silicone oil coating layer, they can move freely and migrate to the surface of the silicone oil coating layer. The silicone oil transfer we often talk about is due to the migration of these silicone oil free radicals from the surface of the release coating layer to the pressure-sensitive adhesive, resin or other materials in contact with it, which adversely affects the performance of the pressure-sensitive adhesive and other materials.

  • Silicone Oil Transfer Is Caused By
    • Insufficient curing of silicone oil.
    • Excessive or insufficient surface treatment.
    • Excessive winding tension.
    • Non-reactive silicone polymers.

  • The Following Methods Can Reduce Silicone Oil Transfer
    • Enhanced curing level of silicone oil.
    • Make sure the surface energy of the coating is sufficient; the surface energy should not be too high.
    • Reduce winding tension.

    If the product cannot have any silicon migration, a non-silicon release liner or a fluorosilicone release liner can be used instead of the silicone release liner.

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