Transparent fire retardant coatings
During the study, a series of organophosphate-grafted nano-TiO2 was synthesised and then applied in amino resin to obtain multifunctional transparent fire-retardant coatings with superior fire resistance, antibacterial and anti-aging properties. Transparency analysis reveals that the addition of nano-TiO2 slightly decreases the light transmittance of the resulting MTiPPBs coatings, which is still remained a high level of transparency. The results of fire tests show that the presence of nano-TiO2 exhibits well synergistic effect on strengthening the smoke suppression property and fire resistance of the MTiPPBs coatings.
Durable fire-resistant and smoke suppression effects
When the weight ratio of PPB and nano-TiO2 is 99.7:0.3, the obtained MTiPPB3 coating shows a 69.5% decrement in smoke density rating and an 83.3% decrement in flame spread rating in comparison to MTiPPB0 coating without nano-TiO2. The accelerated aging test reveals that the presence of nano-TiO2 can minimise the blistering, powdering, and cracking phenomena of the multifunctional coatings, thus displaying durable fire-resistant and smoke suppression effects. Meanwhile, the addition of nano-TiO2 greatly enhances the antibacterial activity of the multifunctional coatings, and MTiPPB3 coating obtains a 45.6% improvement in antibacterial activity index against Escherichia coli compared to MTiPPB0 coating without nano-TiO2.
The study has been published in Progress in Organic Coatings, Volume 169, August 2022.