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A distinct benefit Lupasol® provides is its versatility in the vast substrate types it functions with, which are listed below.
Lupasol® also works well with acrylate monomers and oligomers, commonly used in UV-curable coatings, inks, and adhesives. The combination of substrates and compatibility with acrylates permits widespread usage across applications such as architectural coatings, industrial coatings, packaging inks, and electronic and automotive adhesives. The following sections provide data on the adhesion and film-formation improvements Lupasol®-based primers make in UV-curable systems.
In the study below, a four-micrometer thick UV-curable coating was applied to five different plastic and wood substrates prepared with and without a primer made using Lupasol® P. The coatings were compared for adhesion levels using the cross-hatch adhesion test and strapping tape, where adhesion was rated from 0 (indicating no removal) to 5 (indicating no adhesion). The results show a significant improvement in adhesion for the PP and PE plastic substrates and a substantial improvement for the wood substrates. The plastic substrate sample test results were particularly notable, as PP and PE are low–surface energy surfaces that are difficult to bond to.
To visually depict the performance improvements Lupasol® provides UV-curable systems, an aluminum panel was prepared with and without applying 1% and 10% Lupasol® P primers. The picture below was taken after a UV-curable coating was applied and cured. Here, Lupasol® provided drastic improvements in mitigating lateral shrinkage of the UV-cured film. Also of note, the relatively low 1% Lupasol® use rate practically achieves the same result as the 10% use rate. The improvement in adhesion and lateral shrinkage mitigation also helped improve the leveling of the coating on the aluminum.
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