Addition flame-retardant behaviors of expandable graphite and [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester in rigid polyurethane foams

2015 ◽  
Vol 122 ◽  
pp. 36-43 ◽  
Author(s):  
Wang Xi ◽  
Lijun Qian ◽  
Yajun Chen ◽  
Jingyu Wang ◽  
Xinxin Liu
Keyword(s):  
Flame Retardant ◽  
Phosphonic Acid ◽  
Dimethyl Ester ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foams ◽  
Acid Dimethyl Ester

scholarly journals Flame Retardant Behavior of Ternary Synergistic Systems in Rigid Polyurethane Foams

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 207 ◽  
Author(s):  
Wang Xi ◽  
Lijun Qian ◽  
Linjie Li
Keyword(s):  
Flame Retardant ◽  
Mass Loss Rate ◽  
Dimethyl Ester ◽  
Ternary Systems ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foams ◽  
Char Layer ◽  
Index Value ◽  
Synergistic Flame Retardant

In order to explore flame retardant systems with higher efficiency in rigid polyurethane foams (RPUFs), aluminum hydroxide (ATH), [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester (BH) and expandable graphite (EG) were employed in RPUF for constructing ternary synergistic flame retardant systems. Compared with binary BH/EG systems and aluminum oxide (AO)/BH/EG, ATH/BH/EG with the same fractions in RPUFs demonstrated an increase in the limited oxygen index value, a decreased peak value of heat release rate, and a decreased mass loss rate. In particular, it inhibited smoke release. During combustion, ATH in ternary systems decomposed and released water, which captured the phosphorus-containing products from pyrolyzed BH to generate polyphosphate. The polyphosphate combined with AO from ATH and the expanded char layer from EG, forming a char layer with a better barrier effect. In ternary systems, ATH, BH, and EG can work together to generate an excellent condensed-phase synergistic flame retardant effect.

A facile strategy to fabricate microencapsulated expandable graphite as a flame-retardant for rigid polyurethane foams

2015 ◽  
Vol 132 (31) ◽  
pp. n/a-n/a ◽  
Author(s):  
Xiao-Liang Zhang ◽  
Hong-Ji Duan ◽  
Ding-Xiang Yan ◽  
Li-Quan Kang ◽  
Wei-Qin Zhang ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foams

Expandable Graphite For Halogen-Free Flame-Retardant of High-Density Rigid Polyurethane Foams

2005 ◽  
Vol 44 (7) ◽  
pp. 1323-1337 ◽  
Author(s):  
Lei Shi ◽  
Zhong-Ming Li ◽  
Ming-Bo Yang ◽  
Bo Yin ◽  
Qiu-Ming Zhou ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foams ◽  
High Density ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foams ◽  
Halogen Free

Preparation and Characterization of Excellent Flame Retarded Rigid Polyurethane Foams

2011 ◽  
Vol 374-377 ◽  
pp. 1563-1566
Author(s):  
An Zhen Zhang ◽  
Yi He Zhang
Keyword(s):  
Flame Retardant ◽  
Flame Retardants ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Dimethyl Methylphosphonate ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Foaming Process ◽  
Flame Retarded

Rigid polyurethane foams were excellent thermal insulation materials with widely used, which was highly flammable at the same time. In order to obtain safe application, flame retarded polyurethane foams were needed. In this paper, series flame retarded rigid polyurethane foams were prepared with loading different flame retardants such as ammonium polyphosphate, expandable graphite, red phosphorus, Tri (2-chloroethyl) phosphate and dimethyl methylphosphonate. The effects of flame retardants on the foaming-process and flame retardant property of the rigid polyurethane foams were investigated by otary viscometer and limiting oxygen index. The results showed that the combination of solid and liquid flame retardants was necessary to improve the flame retardant and different flame retardants played synergistic roles in rigid polyurethane foams. The limiting oxygen indexes of the foams could be up to 30wt% and 29.6% with 25wt% solid flame retardants and 10wt% liquid retardants, respectively.

Core-shell expandable graphite @ aluminum hydroxide as a flame-retardant for rigid polyurethane foams

2017 ◽  
Vol 146 ◽  
pp. 267-276 ◽  
Author(s):  
Yintao Wang ◽  
Feng Wang ◽  
Quanxiao Dong ◽  
Mingchen Xie ◽  
Peng Liu ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Aluminum Hydroxide ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Core Shell ◽  
Rigid Polyurethane Foams
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