Effect of flaky graphite with different particle sizes on flame resistance of intumescent flame retardant coating

Results in Materials

Gongfan Tang¹  YaChao Wang²  JiangPing Zhao³  Yujiu Han³ 

[1]School of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, PR China

[2]Corresponding author. Xi’an of Shaan’Xi province in China, Yanta road 13, 11 mailbox, PR China.

[3]School of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, PR China

关键词: Graphite;    Intumescent flame retardant;    Coating;    Heat release rate;    Cone calorimeter;   

DOI  :  

来源: DOAJ

【 摘 要 】

The effect of particle size of flaky graphite (FG) on the flame resistance of intumescent flame retardant (IFR) coatings (polyester resin-ammonium polyphosphate-urea-pentaerythrite) is preliminarily studied by cone calorimeter (CC), XRD, and SEM, to seek appropriate FG in facilely preparing FG-containing IFR coatings. The results of CC determine that the doped FG1500 (with an average particle size of 1500 mesh) constitutes the highest flame-retarding efficiency, evidenced by the lowest peak heat release rate (p-HRR) of 23.5 ​kW ​m−2 at 409 ​s and the fire growth index (FGI) of 0.06 ​kW ​m−2 ​s−1, due to the formation of continuously laminar char residue. However, the finer FG particle (with average particle size less than 3000 mesh) exerts adverse fireproof property, evidenced by the loose and porous char residue, leading to the highest FGI of 0.25 ​kW ​m−2 ​s−1 for FG-containing sample S12000 with an average particle size of 12,000 mesh. It clarifies that the FG with an appropriate particle size is definitely conducive to improving the flame resistance of IFR coating, elucidates that the competition between candlewick effect and physical barrier predominates the flame-retarding mechanism of FG-containing IFR coating. It promotes the benign design of organic-inorganic hybrid IFR coatings.

【 授权许可】

Unknown