Graphene Oxide Nanosheets Decorated with MgAlCr-Layered Double Hydroxide Nanosheets as Flame Retardant Coatings for Steel

Abstract

Epoxy (EP)-based intumescent flame retardant (IFR) coatings were widely applied for protection of steel substrates during fire. Nevertheless, the intumescent coating required some optimization due to inferior compactness and poor antioxidation of its carbon residue. In this work, novel inorganic nano-GO/MgAlCr-LDHs were synthesized and employed for enhancing the flame retardation of traditional intumescent coatings containing ammonium polyphosphate (APP), pentaerythritol (PER), and melamine (MEL). The X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy analysis results showed that nano-GO/MgAlCr-LDHs were successfully synthesized, and the X-ray power spectroscopy (XPS) spectra further indicated that there were some interactions between GO nanosheets and MgAlCr-LDH nanosheets in GO/MgAlCr-LDHs. The thermogravimetric analysis (TGA) results indicated that nano-GO/MgAlCr-LDHs could effectively perfect the thermal stability and char formation of IFR coatings with a maximum pyrolysis temperature (T max ) of 385.9 °C and the highest char residue of 34.6 wt % in air. The microscale combustion calorimeter (MCC) data revealed a 51.7% decline in the peak heat release rate (pHRR) and a 29.7% reduction in the total heat release (THR) compared with those of neat EP coatings when introducing nano-GO/MgAlCr-LDHs into the coatings. Finally, the analysis of char confirmed that the flame retardant mechanism was divided into condensed phase and gas phase mechanisms.

Rapid Preparation of Flame-Retardant Coatings Using Polyurethane Emulsion Mixed with Inorganic Fillers

“…The DIFS method can meet such needs in electrical appliances. Materials with good flame retardant effects can be obtained in the existing research on flame retardant materials [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], but conventional coating preparation methods are still adopted. Herein, this article focused on the use of DIFS method.…”

“…Steel structure houses, metal cables, electric and instrument enclosures, and other metal materials have certain fire-protection needs [ 3 , 4 ]. Flame-retardant coatings can greatly improve the fire resistance of steel structures and prolong the time for which they remain rigid in fires and other high-temperature environments [ 5 ]. Additionally, the flame-retardant coating can considerably reduce the risk of heat accumulation and fire in cables and electric and instrument enclosures under extreme working conditions [ 6 ].…”

Phosphorus grafted chitosan functionalized graphene oxide-based nanocomposite as a novel flame-retardant material for textile and wood

“…GO has been explored as an additive in various polymer systems as an FR material due to its slower combustion process, sluggish ignition, and reduction in the rate of heat release. 20,21 As new and smart coating materials for flame retardancy in combustible materials such as polymers and textiles, graphene and its composites, 22 biopolymers, 23 commercial binder, and graphite have been used in conjunction with ammonium phosphate (AP), N -[3-(trimethoxysilyl)propyl]-ethylene diamine (TMSD), and TiO 2 nanoparticles (TiO 2 NPs). 24 Some research groups used ultrafast, reusable, and weather resistant fire warning materials such as Ti 3 C 2 TxMXene, 25 whereas other fire-resistant materials include polydimethylsiloxane foam composite, 26 clay/graphene oxide nanoribbons, 27 l -ascorbic acid and silane co-functionalized with GO, 28 SiRF nanocomposites containing an ultralow content of GONR, 29 and water-based hybrid APP/GO/TFTS coatings on polyurethane (PU) foam.…”

Improved Pyrolysis Performance of a Cyclic Phosphate‐Melamine Intumescent Fire‐Retardant Coating System Using Ceria as an Additive

“…Although steel itself is nonflammable, it has good thermal conductivity because it is a metal variant. During a fire, steel can quickly reach its critical temperature, and its endurance sharply decreases [2] . When the temperature of steel under fire exceeds about 500 °C, the material twists and collapses [3] .…”

“…During a fire, steel can quickly reach its critical temperature, and its endurance sharply decreases. [2] When the temperature of steel under fire exceeds about 500 °C, the material twists and collapses. [3] The low failure temperature of steel and the fire protection of metal components are important.…”