Synthesis and characterization of a novel modified expandable graphite and its application in rigid polyurethane foams

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.

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Synthesis and Characterization of Functionalized Calix[4]arene Derivatives and Preparation of Rigid Polyurethane Foams by the Incorporation of Calixarene

Macromolecular Symposia ◽

10.1002/masy.201600101 ◽

2017 ◽

Vol 373 (1) ◽

pp. 1600101 ◽

Cited By ~ 1

Author(s):

Maryam Sadat Mirmoeini ◽

Mir Mohammad Alavi Nikje ◽

Mona Rasouli-Saniabadi ◽

Saeed Taghvaei-Ganjali

Keyword(s):

Polyurethane Foams ◽

Synthesis And Characterization ◽

Rigid Polyurethane Foams

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Synthesis and characterization of rigid polyurethane foams from algae oil using biobased chain extenders

Polymer Bulletin ◽

10.1007/s00289-015-1514-1 ◽

2015 ◽

Vol 73 (3) ◽

pp. 727-741 ◽

Cited By ~ 17

Author(s):

Manisha S. Pawar ◽

Aparna S. Kadam ◽

Bhaskar S. Dawane ◽

Omprakash S. Yemul

Keyword(s):

Polyurethane Foams ◽

Synthesis And Characterization ◽

Rigid Polyurethane Foams ◽

Chain Extenders ◽

Algae Oil

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Synthesis and characterization of flame-retardant rigid polyurethane foams derived from gutter oil biodiesel

European Polymer Journal ◽

10.1016/j.eurpolymj.2021.110329 ◽

2021 ◽

Vol 147 ◽

pp. 110329

Author(s):

Guangxu Bo ◽

Xiaoling Xu ◽

Xiaoke Tian ◽

Jiao Wu ◽

Xin He ◽

...

Keyword(s):

Flame Retardant ◽

Polyurethane Foams ◽

Synthesis And Characterization ◽

Rigid Polyurethane Foams

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Preparation and Characterization of Soybean Oil-based Flame Retardant Rigid Polyurethane Foams Containing Phosphaphenanthrene Groups

Letters in Organic Chemistry ◽

10.2174/1570178617666200224104336 ◽

2020 ◽

Vol 17 (10) ◽

pp. 760-771

Author(s):

Qirui Gong ◽

Niangui Wang ◽

Kaibo Zhang ◽

Shizhao Huang ◽

Yuhan Wang

Keyword(s):

Soybean Oil ◽

Flame Retardant ◽

Chemical Structure ◽

Cell Structure ◽

Polyurethane Foams ◽

Limiting Oxygen Index ◽

Rigid Polyurethane Foams ◽

Degradation Activation Energy ◽

Ft Ir

A phosphaphenanthrene groups containing soybean oil based polyol (DSBP) was synthesized by epoxidized soybean oil (ESO) and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Soybean oil based polyol (HSBP) was synthesized by ESO and H2O. The chemical structure of DSBP and HSBP were characterized with FT-IR and 1H NMR. The corresponding rigid polyurethane foams (RPUFs) were prepared by mixing DSBP with HSBP. The results revealed apparent density and compression strength of RPUFs decreased with increasing the DSBP content. The cell structure of RPUFs was examined by scanning electron microscope (SEM) which displayed the cells as spherical or polyhedral. The thermal degradation and flame retardancy of RPUFs were investigated by thermogravimetric analysis, limiting oxygen index (LOI), and UL 94 vertical burning test. The degradation activation energy (Ea) of first degradation stage reduced from 80.05 kJ/mol to 37.84 kJ/mol with 80 wt% DSBP. The RUPF with 80 wt% DSBP achieved UL94 V-0 rating and LOI 28.3. The results showed that the flame retardant effect was mainly in both gas phase and condensed phase.

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