Flame retardancy of modified alkyd resin

DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) has been widely used as effective flame retardants. In this study, a DOPO derivate was used as a reactant for the synthesis of a flame retarded alkyd resin.

Flame retardancy of modified alkyd resin. Source: Pixabay -

DHDOPO (6-((bis(2-hydroxyethyl) amino) methyl)-6H-dibe-nzo[c,e][1,2]oxaphosphinine-6-oxide) was synthesised from DOPO, paraformaldehyde, and diethanolamine.

Decreased PHRR and THR values

Thermogravimetric analysis (TGA) showed that DHDOPO had relatively high thermal stability and would not decompose at synthesis temperature of alkyd resin (ALK). The thermal stability and flame retardancy of ALKs were improved by introduction of DHDOPO. As the mass fraction of phosphorus in flame retarded alkyd resin (FR-ALK) increased the decomposition temperature, the char yield in TGA experiments, the fire residue, and time to ignition in cone calorimeter tests increased, and peak heat release rate (PHRR) and total heat release (THR) decreased. Compared with the non-flame retarded ALK the PHRR and THR values of FR-ALK containing 2.5 wt % phosphorus decreased, respectively, by 43.1% and 58.5%.

The study is published in: Applied Polymer Science, Volume 135, Issue 1, January 05, 2018.

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