Effect of ammonium polyphosphate/cobalt phytate system on flame retardancy and smoke & toxicity suppression of rigid polyurethane foam composites

Abstract

Rigid polyurethane foam/ammonium polyphosphate/cobalt phytate (RPUF/APP/PA-Co) composites were prepared by one-step water-blown method using ammonium polyphosphate (APP)/cobalt phytate (PA-Co) as a flame retardant system. The char residue of RPUF/APP/PA-Co increased significantly than that of RPUF, indicating that the thermal stability of composites was enhanced. Cone calorimetry and smoke density tests showed that when 40 phr APP and 10 phr PA-Co were added, the total heat release and smoke release of RPUF/APP40/PA-Co10 composite decreased significantly. TG-IR test confirmed that APP/PA-Co could significantly inhibit the release of flammable gases (hydrocarbons, esters) and toxic gases (aromatic compounds, isocyanate, CO, HCN,) of RPUF/APP/PA-Co composites and improve the fire resistance of composites. SEM-EDS, Raman spectra and FTIR were applied to investigate the char residues of composites. The results showed that APP/PA-Co loading was beneficial to the generation of dense char layer with high degree of graphitization and reducing the release of combustible substances and smoke of composites.

Synergy between manganese phytate and expandable graphite on thermal stability and combustion behavior of rigid polyurethane foam

“…In order to create rigid polyurethane foam/ammonium polyphosphate/cobalt phytate (RPUF/APP/PA‐Co) composites, Zhang et al employed ammonium polyphosphate (APP)/cobalt phytate (PA‐Co) as a flame retardant system. The findings demonstrated the value of APP/PA‐Co loading in producing a thick carbon layer with a high degree of graphitization, which lowered the release of combustibles and smoke from the composite 7 . Aluminum phytate (PA‐Al) and iron phytate (PA‐Fe), which were added to RPUF as flame retardants, were researched by Yang et al for their synthesis.…”

“…The findings demonstrated the value of APP/PA-Co loading in producing a thick carbon layer with a high degree of graphitization, which lowered the release of combustibles and smoke from the composite. 7 Aluminum phytate (PA-Al) and iron phytate (PA-Fe), which were added to RPUF as flame retardants, were researched by Yang et al for their synthesis. The findings showed that RPUF/PA-Fe30 had a much larger char residue than RPUF (12.4 wt %), with a value of 22.1 wt%.…”

Facile Construction of Inorganic Phosphorus/Boron-Layered Double Hydroxide Complexes for Highly Efficient Fire-Safety Epoxy Resin

“…Similar to other inorganic flame retardants, how to raise the efficiency of APP in flame-retardant EP composites attracts the researchers’ attention. Recently, inspired by synergistic charring catalysis effect, plenty of work on the incorporation of APP and metal elements has been done, for instance, APP and/or iron, zirconium, zinc, aluminum, cobalt, nickel elements, etc. Our previous work also illustrates that the iron-modified APP can both obviously decrease the heat release and diminish the smoke product of EP .…”

Facile Constructing Inorganic Phosphorus/boron-layered Double Hydroxide Complexes for Highly Efficient Fire-safety Epoxy Resin

“…Similar to other inorganic ame retardants, how to raise the e ciency of APP in ame retardant EP composites attracts the researchers' attention. Recently, inspired by synergistic charring catalysis effect, plenty of work on the incorporation of APP and metal elements has been done, for instance, APP and/or iron, [21] zirconium, [22] zinc, [23] aluminum, [24] cobalt, [25] nickel elements, [26] etc. Our previous work also illustrates that the iron-modi ed APP can both obviously decrease the heat release and diminish the smoke product of EP.…”