Fire performance of piperazine phytate modified rigid polyurethane foam composites

Abstract

Using phytic acid (PA) and piperazine (Pi) as raw materials, piperazine phytate (PA‐Pi) was fabricated by simple ionic reaction. Furthermore, A series of rigid polyurethane foam/piperazine phytate (RPUF/PA‐Pi) composites were prepared by one‐step water‐blown technology. Thermogravimetric (TG) results showed that the addition of PA‐Pi improved the thermal stability of RPUF/PA‐Pi composites at high temperature. At 700°C, RPUF/PA‐Pi20 exhibited the highest carbon residue of 25.8 wt%. Cone calorimetry and smoke density tests suggested that PA‐Pi could reduce the heat and smoke release during combustion process of the composites, thus reducing their fire hazard. Thermogravimetric‐Fourier transform infrared spectroscopy (TG‐FTIR) indicated that PA‐Pi significantly inhibited the release of toxic gases (isocyanate compounds, aromatic compounds, CO and HCN) and flammable gases (hydrocarbons and esters) during the decomposition process of RPUF/PA‐Pi composites, effectively improving fire performance of the composites. Scanning electron microscope (SEM), Raman and Fourier transform infrared spectroscopy (FTIR) were used to characterize the carbon residue of RPUF/PA‐Pi composites. The results showed that PA‐Pi could promote the formation of dense carbon layer of composites and effectively prevented heat and mass transfer in the combustion process.

Preparation and Properties of Polyaniline Self-Healing Conductive Materials Based on Hydrogen Bonding and Electrostatic Interaction Forces

“…At 55 to 100 °C, this mass loss is due to the evaporation of residual water in the sample. 12 As the temperature increases, the cellulose starts oxidative thermal decomposition, 39 and the thermal decomposition of PA molecules forms unstable residues, 40 and the sample continues to lose weight. The temperature continued to increase, and the main chain of the polyaniline molecule started to decompose.…”

Facile Synthesis of Zinc‐Containing Mesoporous Silicate from Iron Tailings and Enhanced Fire Retardancy of Rigid Polyurethane Foam

“…Figure 2 displays thermal decomposition curves of FR-RPUF under an N 2 atmosphere, and the relevant data are summarized in Table S2 (Supporting Information). For pure RPUF, the pyrolysis process is divided into two stages: 200-330 °C for the hard segment degradation and 330-450 °C for the soft segment degradation (Figure 2a), [20,21] the T max−1 and T max-2 occur at 309 and 356 °C, respectively. Finally, it has a char residue of 16.6 wt% at 700 °C.…”

Surface Flame-Retardant Systems of Rigid Polyurethane Foams: An Overview

“…In addition, synthetic organic flame retardants containing phosphorus are rapidly developing due to their environmental friendliness, high flame-retardant efficiency, ease of modification, etc. [ 16 , 17 , 18 , 19 , 20 ]. Zhang et al [ 16 ] synthesized a flame retardant from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), benzaldehyde, and aniline; the limit oxygen index (LOI) of RPUF increased to 28.1% and the char residue increased from 6.1% to 15.3% in the cone calorimeter test.…”