Transparent coatings with good flame retardancy

Researchers have presented a highly transparent acrylate epoxidised soybean oil based UV–curable silicone–modified coating with good thermal stability and flame retardancy.

Soy beans.
The study provides a new method for the preparation of biomass-derived macromolecular photoinitiators for UV-curable wood coatings. Image source: jcesar2015 - Pixabay (symbol image).

Thermal stability, flame retardancy and transparency are essential for UV–curable materials serving as package materials for some optical or electronics devices. In a new paper, acrylate epoxidised soybean oil (AESO) based UV–curable silicone modified coatings with good thermal stability, good flame retardancy, transmittance above 97% were fabricated by UV initiated thiol–ene reaction of AESO and thiol silicone resin.

Improved flame retardency

The thermal stability of the AESO–based UV–curable silicone–modified coatings was better than that of neat AESO–based UV–curable coatings reported previously, because the thermal initial decomposition temperature (Td5) of the former is in the range of 313–322 °C while that of the latter is only in the range of 214–283 °C. Cone calorimetry test denotes AESO–based UV–curable silicone–modified coatings possess good flame retardancy because the maximum value of the heat release rate (HRR) and CO release (CO Yield) for AESO–based UV–curable silicone–modified coatings are 450–550 kW/m2 and 0.02%–0.33%, respectively. The mechanism for the improvement of flame retardancy was studied by scanning electron microscope (SEM) analysis of the surface morphology of the chars after being burned.

The study has been published in Progress in Organic Coatings, Volume 165, April 2022.

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