Synergistic effect of nano magnesium amino-tris-(methylenephosphonate) and expandable graphite on improving flame retardant, mechanical and thermal insulating properties of rigid polyurethane foam

2018 ◽  
Vol 219 ◽  
pp. 318-327 ◽  
Author(s):  
Lei Liu ◽  
Zhengzhou Wang
Keyword(s):  
Synergistic Effect ◽  
Flame Retardant ◽  
Polyurethane Foam ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foam ◽  
Thermal Insulating ◽  
Insulating Properties

Dependence of flame-retardant properties on density of expandable graphite filled rigid polyurethane foam

2007 ◽  
Vol 104 (5) ◽  
pp. 3347-3355 ◽  
Author(s):  
Xiang-Cheng Bian ◽  
Jian-Hua Tang ◽  
Zhong-Ming Li ◽  
Zhong-Yuan Lu ◽  
Ai Lu
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foam ◽  
Flame Retardant Properties

scholarly journals Enhanced Fire Safety of Rigid Polyurethane Foam via Synergistic Effect of Phosphorus/Nitrogen Compounds and Expandable Graphite

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4741
Author(s):  
Chuan Liu ◽  
Ping Zhang ◽  
Yongqian Shi ◽  
Xiaohui Rao ◽  
Suncheng Cai ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Polyurethane Foam ◽  
Fire Safety ◽  
Fire Hazard ◽  
Expandable Graphite ◽  
Nitrogen Compounds ◽  
Rigid Polyurethane Foam ◽  
Gaseous Products ◽  
The Matrix ◽  
Physical Barriers

In order to explore highly efficient flame-retardant rigid polyurethane foam (RPUF), phosphorus/nitrogen compounds and expandable graphite (EG) were successfully incorporated into RPUF by a free one-spot method. The combustion results showed that the fire safety of the RPUF samples was remarkably improved by the addition of phosphoric/nitrogen compounds and EG. With the incorporation of 22.4 wt.% phosphorus/nitrogen compounds and 3.2 wt.% EG, the RPUF composites achieved UL-94 V-0 rating. Besides, the total heat release and total smoke release of RPUF composites were reduced by 29.6% and 32.4% respectively, compared to those of the pure RPUF sample. PO• and PO2• together with nonflammable gaseous products were evolved from phosphoric/nitrogen compounds in the gas phase, which quenched the flammable free radicals in the matrix and diluted the concentration of combustible gaseous products generated from PRUF during combustion. The compact char residues which acted as excellent physical barriers were formed by catalysis of EG and phosphoric/nitrogen compounds in the condense phase. The fire hazard of RPUF was significantly reduced by the synergistic effect of phosphorus-nitrogen compounds and EG. This work provides a promising strategy to enhance the fire safety of RPUF.

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