Abstract
The flame retardancy of waterborne intumescent coatings for plywood has been investigated. Different concentrations (1%, 3%, 5%, and 10%) of organoclay (Cloisite 15A) were added to a hybrid (etherified melamine formaldehyde and polyvinyl acetate) resin to generate coatings. The CO and CO2 emissions from the coatings during combustion were determined. An intumescent coating containing organoclay exhibited superior flame-retardant properties than does the pure hybrid resin. By comparing the performance of intumescent coatings prepared using organoclay and unmodified clay, it has been demonstrated that coatings contain the modified clay that have better flame-retardant properties. The presence of organoclay in the coating promotes the formation of an ideal char layer during combustion when the concentration is 3%. Intumescent coatings containing organoclay undergo combustion with lower CO emissions, but greater CO2 emission. 13C, 27Al, and 31P solid-state nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy were used to determine the chemical structure of the char layers to determine the mechanism underlying char formed upon combustion and delineate the process of char degradation. Based on the observed flammability and CO/CO2 emission, intumescent coatings containing 3% or 5% organoclay display a greater reduction in flammability than do coatings containing higher concentrations of the organoclay.
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Abbreviations
- BR:
-
Binder resin
- CS:
-
Carbonizing substance
- FPS:
-
Foam producing substance
- DA:
-
Dehydrating agent
- FR2:
-
Flame retardant without organoclay
- FRmt :
-
Flame retardant with 5% montmorillonite without modification
- FRoc1:
-
Flame retardant with 1% Cloisite 15A
- FRoc3:
-
Flame retardant with 3% Cloisite 15A
- FRoc5:
-
Flame retardant with 5% Cloisite 15A
- FRoc10:
-
Flame retardant with 10% Cloisite 15A
- THR:
-
Total heat release
- Time to PHRR:
-
Time to peak heat release rate
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Acknowledgments
Financial support (MOST 108-2811-E-002-542 and 108-2221-E-002-052) from Ministry of Science and Technology of Taiwan is acknowledged.
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Chuang, CS., Wu, KC. & Sheen, HJ. Waterborne etherified MF and PVAc hybrid resin containing nanoclay as intumescent flame-retardant plywood coatings. J Coat Technol Res 20, 843–856 (2023). https://doi.org/10.1007/s11998-021-00607-5
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DOI: https://doi.org/10.1007/s11998-021-00607-5