In order to improve the flame retardancy and crack resistance of coating, halloysite nanotubes (HNTs) were grafted with phosphorus-containing reactive agent (PRA) and then combined with waterborne amino resin (MF) to prepare transparent intumescent fire retardant coatings. The reaction mechanism was analyzed by Fourier transform infrared spectroscopy, nuclear magnetic resonance (1H NMR), X-ray crystallography and other analytical means. Thermogravimetric analysis, scanning electron microscope, and the cone calorimeter were used to explore the action mechanism of the halloysite nanotubes (HNTs) on coating expansion and carbon layer morphology. The results showed that HNTs could be grafted onto the PRA molecule chain through the reaction between Al—OH and P—OH, and PRA molecules could also penetrate the interlayers of HNTs. The grafting of HNTs did not have an adverse effect on the transparency of the coating. When the HNTs content was 5%, the residual char ratio at 800 ℃ increased by 43. 6%. The ignition time, AveHRR180 s, and THR300 s of wood with these coatings with 5%HNTs were extended by 38 seconds, and decreased by 66. 1% and 55. 6%, respectively. And no cracks generated in the coating.
LUO J M, HE J R, JIANG J R, et al.
. Study on the Preparation and Performance of Crack-resistant Waterborne Transparent Fire Retardant Coatings[J]. Paint & Coatings Industry, 2024
, 54(3)
: 32
-40
.
DOI: 10.12020/j.issn.0253-4312.2023-286
