Effect of Additives on UV-activated Urethane Acrylate Polymerization Composite Coatings

Abstract

An increased demand for new and improved coating systems, for environmental & health & safety and performance reasons, have appeared during the recent decades. Currently, there is new interest in preparation of thin UV curable urethane acrylate (UA) composite coatings with short-term properties. Cellulose based additives: nitrocellulose, cellulose acetate butyrate, sucrose benzoate and silica were evaluated to determine their influence on unreacted composite characteristics (viscosity, pigment suspension stability) and characteristics of cured film (ultimate tensile strength, elongation at break, surface gloss, surface scratch resistance and film adhesion loss time). The most suitable additive content was found to provide required viscosity. All additives increase surface scratch resistance, but cellulose based additives increase surface gloss values and decrease the time of adhesion loss. Silica has great effect on the interaction between linear and hyperbranched urethane acrylates, which has crucial influence on the stability of uncured pigmented mixture samples.

Customizing ultraviolet curable polymer‐ink properties via reactive diluent modification and viscosity control

“…While these variations do impact mechanical performance, the effect is not particularly pronounced. This observed improvement aligns with previous studies that have reported enhanced mechanical strength in crosslinked acrylate polymers as the degree of crosslinking increases 32 …”

Evaluation of Reactive Diluent Impact on Stability of Systems Viscosity in UV-Curable Compositions

“…Traditional UV formulations do not contain solvents and are relatively viscous compared to solvent-borne formulations. That is because acrylate monomers are relatively weak solvents for the acrylated oligomers resins [4], but for this application solvents in tested concentration had too high decrease in viscosity. Remarkable decrease of solvent concentration could allow to achieve required characteristics, and would improve the coating adhesion, decreasing the shrinkage [7].…”

“…This has a positive effect on coating adhesion because UV-induced shrinkage will be reduced. The addition of IP should be checked in pigmented systems, to avoid pigment sedimentation [4].…”

“…UV-curing urethane acrylates have been used as compositions for different coatings [1,2], as dental restorative materials [3] and as natural nail coatings for medical and esthetical reasons [1,4].…”

Processing Technology Development for Organic Clay Suspension System

“…To overcome pigment sedimentation in gel polish systems, already small concentrations of silica (1 %.wt) can create thixotropic system and do not affect viscosity significantly [6,7].…”