Influence of melamine cyanurate and boehmite on flame retardancy of PA6

Preparation and property analysis of kaolin/melamine cyanurate/aluminum diethylphosphinate/recycled PET composites

“…When 15% MCA was added to R‐PET, the LOI of 15‐MCA/R‐PET composite was 26.4%, and the flame retardant reached UL94 3.2 mmV2 grade. This enhancement might be ascribed to MCA was decomposed by heat to produce non‐flammable gases 35 such as NH 3 , N 2 , NO 2 , CO 2 , and water vapor, which could dilute oxygen and flammable gases produced in the combustion process, 16 thus improved the flame retardant of R‐PET. When 15% ADP was added to R‐PET, the LOI of 15‐ADP/R‐PET composite was 30.2%, and the flame retardant reached UL94 3.2 mm V0 level.…”

“…It can be seen from Table 5 that when MCA was added to the 15‐ADP/R‐PET composite, the UL94 rating and LOI of MCA/ADP/R‐PET composite gradually increased, while the tensile strength, flexural strength and notched impact strength gradually decreased with the increased of MCA addition amount. The results was due to the non‐flammable gases such as NH 3 , NO 2 , CO 2 , and water vapor generated by the thermal decomposition of MCA dilute the oxygen and combustible gases, which improved the flame retardant of the composite in the gas phase, 16 so the overall flame retardant of the composite was improved. However, the compatibility between MCA and R‐PET was not good, and the effect of force transfer inside the material was poor, so that the mechanical properties of the composites decline 44 .…”

“…It can also be seen from the table that the tensile strength, flexural strength and notched impact strength of 15-MCA/R-PET or 15-ADP/R-PET composite were decreased relative to R-PET. The result might be attributed that the compatibility of MCA and ADP with polymer matrix was poor, 16,39 the interface link strength between MCA and R-PET (ADP and R-PET) was weak, and the transfer effect of force in the composite material was poor, so that the strength and toughness of the composite material decreased. In addition, the tensile and flexural strength of 15-Kaol/R-PET composite increased compared with R-PET, while the notched impact strength decreased.…”

“…Melamine cyanurate was a nitrogen-based flame retardant with the advantages of high nitrogen content, low toxicity, low smoke and high flame retardant efficiency, [11][12][13] which could be used to improve the flame retardancy of polymers. [14][15][16][17] As a typical phosphate-based flame retardant, aluminum diethylphosphonate (ADP) had the advantages of good thermal stability, high flame retardant efficiency, low smoke density and easy processing, [18][19][20] which let it become one of the research hotspots of phosphate-based flame retardants, and some research achievements had been made. [21][22][23] Layered silicate was a kind of clay mineral with lamellar structure, and the lamellar scale was nanoscale, 24,25 which addition to the polymer could improve the mechanical, thermal stability and flame retardant properties of the polymer.…”

“…Therefore, researchers had increased their research on halogen‐free flame retardants, 9,10 such as phosphorus, organosilicon and phosphorus–nitrogen flame retardants. Melamine cyanurate was a nitrogen‐based flame retardant with the advantages of high nitrogen content, low toxicity, low smoke and high flame retardant efficiency, 11–13 which could be used to improve the flame retardancy of polymers 14–17 . As a typical phosphate‐based flame retardant, aluminum diethylphosphonate (ADP) had the advantages of good thermal stability, high flame retardant efficiency, low smoke density and easy processing, 18–20 which let it become one of the research hotspots of phosphate‐based flame retardants, and some research achievements had been made 21–23 .…”