Preparation and characterization of microencapsulated ammonium polyphosphate and its synergistic flame-retarded polyurethane rigid foams with expandable graphite

2013 ◽  
Vol 63 (1) ◽  
pp. 84-92 ◽  
Author(s):  
Zaihang Zheng ◽  
Juntao Yan ◽  
Huimin Sun ◽  
Zhiqiang Cheng ◽  
Wenjie Li ◽  
...  
Keyword(s):  
Ammonium Polyphosphate ◽  
Expandable Graphite ◽  
Flame Retarded ◽  
Rigid Foams ◽  
Microencapsulated Ammonium Polyphosphate

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.

Synthesis and Characterization of a Novel Polyhydroxy Triazine Charring Agent and Properties of its Flame Retarded Polyproylene

2013 ◽  
Vol 746 ◽  
pp. 23-27 ◽  
Author(s):  
Sun Liu ◽  
Yi Lun Tan ◽  
Si Chun Shao ◽  
Yin Yin Hui ◽  
Zhi Han Peng
Keyword(s):  
Weight Ratio ◽  
Fire Performance ◽  
Limiting Oxygen Index ◽  
Melamine Phosphate ◽  
Charring Agent ◽  
Flame Retarded ◽  
Ul 94 ◽  
Microencapsulated Ammonium Polyphosphate ◽  
Triglycidyl Isocyanurate

In this study, a novel polyhydroxy triazine charring agent (PT-CA) was synthesized through the solid-state reaction of triglycidyl isocyanurate (TGIC) and pentaerythritol. Meanwhile, the molecular structure of the chemical compound was determined by FTIR, elemental analysis and thermalgravimetric analysis (TG).Then it is combined with microencapsulated ammonium polyphosphate (MAPP) and melamine phosphate (MP) to impart flame retardance and dripping resistance for polypropylene (PP).The fire performance of treated PP was investigated by limiting oxygen index (LOI) and vertical burning test (UL-94).It has been found that the treated PP with the optimal flame retardant formulation of MAPP:MA:PTCA=18:6:6 (weight ratio, formulation 10) gives an LOI of 31.5 and UL-94 V-0 rating.

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