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For the improvement of adhesion, we have previously introduced a bifunctional polyurethane resin FSP7126.
This resin has outstanding properties such as high reactivity, excellent adhesion, high solids and low viscosity, and good polishing properties.
It is widely used in inks.
, Roll coating varnish and other solvent-free systems.
However, this resin also has problems such as insufficient cross-linking, easy whitening in water, and large odor, which limits its use in some applications.
Recently, Runao Chemical Technology Center has specially developed an adhesion promoting resin-FSP7108 based on FSP7126, which mainly improves the boiling resistance, irritation and stability of the com" href="">coating online coatingol.
com .
Adhesion
The strength of adhesion is not only related to the surface state of the substrate, the composition of the surface material and the compactness of the material itself, but also the shrinkage stress, surface tension, crystallinity and volume of polar functional groups in the coating.
related.
Curing speed
Part of the reason for the poor adhesion may be related to the excessive shrinkage of the system.
In this case, we often add some low-functional resins or monomers to the system to reduce the shrinkage, but at the same time it will affect the overall reactivity In the actual measurement, whether in a mercury lamp or an LED system, FSP7108 can be surface-dried when the energy reaches 300mJ/cm², and the curing speed is very fast.
Polish
FSP7108 has excellent wettability and color development for pigments, strong colorability, bright paint film color, excellent pigment dispersion stability, no pigment precipitation or flocculation agglomeration, suitable for ink and other color additives.
Boil-resistant
Generally, resins with good adhesion to special substrates have low crosslinking density, and the paint film is easy to whitish after being tested for resistance to boiling water.
FSP7108 is matched with a small amount of high-end resin, sprayed and cured on conventional plastic substrates or TPA primer, and then tested in boiling water for 1 hour.
Flexibility
We use the coating bending test to test the flexibility of the resin.
We use different bending angles to bend the film with the cured coating to detect whether the coating is cracked or peeled off.
to sum up
In summary, urethane acrylate FSP7108 has high reactivity, excellent adhesion, good glossiness and flexibility, and has good boiling resistance, irritation and stability.
It is recommended as an adhesion promoting resin.
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