Influence of Three Functional Monomers on Performance of UV Cured Polyurethane Pressure-sensitive Adhesive
The most important characteristic of UV cured pressure-sensitive adhesive(PSA)is its adhesion and cohesion to various objects,which are interdependent.A series of polyurethane pressure-sensitive adhesives with different molecular structures were prepared based on the correlation between the curing structure and properties of pressure-sensitive adhesives.The effects of functional monomers such as trimethylolpropane triacrylate(TMPTA),triallyl isocyanurate(TAIC),and tri[2-(acroxy)ethyl]isocyanurate(TAEI)on the thermal stability,adhesion performance,and cohesive strength of pressure-sensitive adhesive were studied through thermogravimetric analysis,differential scanning calorimetry,initial adhesion,peeling force,shear force,and rheological testing.The results indicate that all pressure-sensitive adhesives have good thermal stability and adhesion properties,with peel strengths of 220,260 and 228 N/m,respectively.Pressure sensitive adhesive(PU-S2)with a rigid heterocyclic structure has high cohesive strength,with a shear strength of 412.1 kPa.At the same time,the prepared pressure-sensitive adhesive also has a high gel content.Due to the difference of functional group reaction activity,the gel content of PU-S2 is lower than that of PU-S1 and PU-S3.
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