Effect of zinc borate on the thermal degradation of ammonium polyphosphate

2007 ◽  
Vol 456 (2) ◽  
pp. 134-144 ◽  
Author(s):  
F. Samyn ◽  
S. Bourbigot ◽  
S. Duquesne ◽  
R. Delobel
Keyword(s):  
Thermal Degradation ◽  
Ammonium Polyphosphate ◽  
Zinc Borate

Flame retardancy of unsaturated polyester composites with modified ammonium polyphosphate, montmorillonite, and zinc borate

2018 ◽  
Vol 136 (11) ◽  
pp. 47180 ◽  
Author(s):  
Mengwei Jiang ◽  
Yunshu Zhang ◽  
Yuan Yu ◽  
Qingwu Zhang ◽  
Bujun Huang ◽  
...  
Keyword(s):  
Flame Retardancy ◽  
Unsaturated Polyester ◽  
Ammonium Polyphosphate ◽  
Zinc Borate ◽  
Polyester Composites

scholarly journals Density Effect on Flame Retardancy, Thermal Degradation, and Combustibility of Rigid Polyurethane Foam Modified by Expandable Graphite or Ammonium Polyphosphate

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 668 ◽  
Author(s):  
Yang ◽  
Liu ◽  
Jiang ◽  
Chen ◽  
Wan
Keyword(s):  
Weight Loss ◽  
Thermal Degradation ◽  
Heat Release ◽  
Polyurethane Foam ◽  
Apparent Density ◽  
Flame Retardancy ◽  
Ammonium Polyphosphate ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foam ◽  
Combustion Behaviors

The current study aims at comparatively investigating the effect of apparent density on flame retardancy, thermal degradation and combustion behaviors of rigid polyurethane foam (RPUF), RPUF/ expandable graphite (EG) and RPUF/ ammonium polyphosphate (APP). A series of RPUF, RPUF/EG and RPUF/APP samples with different apparent densities (30, 60 and 90 kg/m3) were prepared. The flame retardancy, thermal degradation, and combustion behaviors of each sample were investigated. Limiting oxygen index (LOI) results indicated that increasing apparent density was beneficial to the flame retardancy of all foam systems. The effect of apparent density on the enhancement of flame retardancy followed the sequence of RPUF < RPUF/APP < RPUF/EG. Thermogravimetric analysis (TGA) results showed that an increase in the apparent density can cause more weight loss in the first degradation stage and less weight loss in the second degradation stage for all foam systems. The combustion behaviors also showed significant differences. The samples with a higher apparent density showed a longer duration of heat release and higher total heat release (THR). The findings in this study demonstrated that apparent density played an important role in flame retardancy, thermal degradation, and combustion behaviors of RPUF, which must be paid more attention in the studies of flame-retardant RPUF.

scholarly journals Ammonium Polyphosphate Intercalated Layered Double Hydroxide and Zinc Borate as Highly Efficient Flame Retardant Nanofillers for Polypropylene

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1114 ◽  
Author(s):  
Yanshan Gao ◽  
Qiang Wang ◽  
Weiran Lin
Keyword(s):  
Flame Retardant ◽  
Ammonium Polyphosphate ◽  
Zinc Borate ◽  
Polypropylene Composites ◽  
Flame Retardant Property ◽  
Thermogravimetric Analyzer ◽  
Mixing Method ◽  
And Performance ◽  
Double Hydroxide ◽  
Double Hydroxides

We found in our previous study that layered double hydroxides (LDHs) which undergo aqueous miscible organic solvent treatment (AMOST) can tune the hydrophobicity surface of LDHs to be hydrophobic, and then the solvent mixing method can be used to prepare polymer/LDH nanocomposites. However, flame retardant property is not very high if LDHs are only used. In this present work, ammonium polyphosphate (APP) intercalated LDHs and zinc borate (ZB) was incorporated into a polypropylene (PP) matrix using the solvent mixing method. The structures, morphologies, and performance of the composites were characterized carefully. The peak heat release rate (PHRR) reduction of PP containing 10 and 20 wt % APP-LDH reached 27% and 55%, respectively, which increased up to 63% compared with PP/CO3-LDH. After incorporating 2 wt % ZB in the PP/APP-LDH system, the flame retardant property was further improved. Polypropylene composites with 20 wt % APP-LDH and 2 wt % ZB showed a 58% PHRR reduction. In addition, thermogravimetric analyzer (TGA) results indicated that the addition of APP-LDH and ZB improved the temperature at 50% weight loss (T50%) and the char formation of the materials significantly.

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