Synergistic effect of organically modified zinc aluminum layered double hydroxide in intumescent flame‐retarding polypropylene composites containing melamine phytate and dipentaerythritol

Abstract

In this article, an organically modified zinc aluminum layered double hydroxide (OLDH) was prepared by a facile and effective method. The aim for preparing and decorating LDH is to improve the dispersion of OLDH particles in polypropylene (PP). Fourier transform infrared (FTIR) spectra and X‐ray diffraction (XRD) spectra have verified the feasibility for preparing OLDH. In contrast with LDH, the hydrophobicity of OLDH was obviously changed after introduction of sodium dodecyl benzene sulfonate. Together with melamine phytate/dipentaerythritol (MPA/DPER), OLDH was introduced into PP by melt blending. Surprisingly, the synergistic effect of OLDH and MPA/DPER was obviously found in flame‐retarding PP. When the content of MPA/DPER and OLDH are 27 phr and 3 phr, the limiting oxygen index value of PP composites is 30.5% and samples can pass UL‐94 V‐0 rating. Thermogravimetric analysis demonstrates that the participation of OLDH can further enhance the thermal stability of PP/MPA/DPER. Moreover, the surface morphology and chemical structure of PP composites after combustion were systematically analyzed by optical photos, SEM, FTIR spectra, and X‐ray photoelectron spectroscopy spectra, respectively. The results reveal that the reinforcing effect of OLDH for char layers structure becomes the main reason for improving the flame retardancy of PP composites. Based on abovementioned analysis, a potential synergistic flame retardant mechanism was primarily proposed. POLYM. ENG. SCI., 59:2301–2312, 2019. © 2019 Society of Plastics Engineers

Synthesis, mechanical, and flammability properties of metal hydroxide reinforced polymer composites: A review

“…However, most polymers are easily flammable. [40][41][42] Burning of polymers depends on ignition, fire spread and heat release behavior. Each and every step of combustion Precipitation method According to scanning electron microscopy, the obtained magnesium hydroxide showed plate-like particles.…”

“…However, most polymers are easily flammable. [ 40–42 ] Burning of polymers depends on ignition, fire spread and heat release behavior. Each and every step of combustion requires enough amount of heat, fuel, and oxygen supplied into the system.…”

Potential Use of Melamine Phytate as a Flame-Retardant Additive in Chicken Feather-Containing Thermoplastic Polyurethane Biocomposites

“…Several different additives including biomolecules were used to enhance the flame retardant properties of TPU-based composites. , Biomolecules including phytic acid derivatives have been considered environmentally friendly flame retardant fillers in various polymeric materials. ,,, Phytic acid was used to modify boron nitride and silicon nitride, and the resulting modified compounds were used as flame-retardant additives in TPU. − Phytic acid has the ability to form complexes with organic cations including melamine via coordinative bonds and supramolecular interactions. , Melamine is classified in nitrogen-containing flame-retardant additives and is considered environmentally friendly due to the low evolution of smoke and low toxicity in the event of fire with the release of carbon dioxide, ammonia, and water . The flame retardant effect of melamine phytate (MPht) was investigated in polypropylene − and poly­(lactic acid) …”

Synergistic Flame Retardant Effect of Barium Phytate and Intumescent Flame Retardant for Epoxy Resin

“…Pa consists of six phosphate groups, which is beneficial to the electrochemical stripping and makes the system have high flame retardancy. The recent researches reveal that Pa has been used as a bio-based flame retardant due to its biodegradability, compatibility, high phosphorus content (28 wt%) and non-toxic properties, and is able to improve the flame retardancy of ethylene-vinyl acetate [ 34 ], polypropylene [ 35 , 36 , 37 ], polylactic acid [ 38 ], cotton fabrics [ 39 ], and epoxy resin. Jaime C.Grunlan et al first used Pa as a flame retardant [ 40 ].…”