Bio-based UV curable coatings are nowadays a new focal point for the researcher exploring alternate routes for replacing petro-synthetic products. For a purpose of using bio-based compounds, epoxidized soybean oil (ESO) was chosen due to the presence of epoxy groups. To synthesize UV curable formulation, epoxy groups further reacted with acrylic acid to form an acrylic double bond which is reactive under UV radiation. The reaction was propagated until the acid value become less than 15 mg KOH/g for the resulting product of acylated epoxy soybean oil (AESO). Pre and post-curing the resin, FTIR peak for C=C were analyzed for confirmed curing by calculating the cure percentage which was observed above 86%. With and without the DMPA photo initiator curing time was 6 min and 2.5 hours, respectively which is a significant improvement for the sake of reducing the curing time of the material. MEK rub tests were performed to see coating properties to understand crosslinking in the polymer matrix. To enhance mechanical and thermal properties, TiO2 and SiO2 fillers were added to the curing formulation. The coated materials were characterized by TGA, tensile, flexural, gel content, water contact angle and under different chemical environments. UV-curable epoxy-acrylates were successfully synthesized in one step reaction without any solvent and separation process.

Soyabean oil based acrylic acid for ultraviolet curable coatings and 3D printing

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