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Scientists studied the flame retardant and smoke-suppressing properties of layered double hydroxide-enhanced transparent expansion flame retardant coatings.
A new series of layered dihydrobide (LDH)-modified phosphate (LPPBs) flame retardants are synthesized through the reactions of flexible phosphates (PBBs) and LDHs with different mass ratios, and then transformed infrared spectroscopy (FTIR) and
1
H MRI spectra (
1
H NMR) through Fourier.
will be obtained by the LPPB mixed with melamine formaldehyde resin to produce transparent flame retardant coatings for wood substrates
.
Based on the results of the X-ray diffraction (XRD) map and scanning electron microscopes, it is determined that coatings containing LDHs show a high degree of transparency even at high LDH levels due to the dispersion and complete peeling of LDHs in amino bodies. SEM) picture.
fire test shows that with the introduction of LDHs, with the increase of expansion coefficient, the weight loss of coating, carbonization index and flame spread level decreased significantly.
has excellent flame retardant
conical heat meter and flue gas density tests show that the introduction of LDH has greatly improved the flame retardant and smoke suppression of coatings due to the formation of denser, continuous and expanding carbon during combustion. The results of thermal weight analysis (TG) show that with the increase of LDH content, the thermal stability and residual weight of the coating gradually increase.
Carbon residue analysis shows that the introduction of LDHs into the coating helps to generate more phosphorus-rich crosslinking structures and aromatic structures in the condensation phase, resulting in denser, hotter and more stable carbon to prevent the release of heat and flue gas, thus demonstrating excellent flame retardant and smoke suppression properties.
the study has been published
The Journal of Coating Technology and Research, Volume 1. 17, 2020
.
.