A new flame retardant on the basis of diethylenetriamine copper(II) sulfate complex for combustibility suppressing of epoxy-amine composites

• Published in: Fire safety journal 2016-02, Vol.80, p.30-37
• Main Authors: Lavrenyuk, H., Kochubei, V., Mykhalichko, O., Mykhalichko, B.
• Format: Article
• Language: English
• Subjects: AMINES; Bisphenol A; COMBUSTION; COMPOSITES; Copper(II) chelate complex; DETA; EPOXIES; ETHYLENE; Fire protection; Flame retardant; Flame retardants; FLAMMABILITY; Modified epoxy-amine composites; PROPERTIES; Sulfates; Suppression of combustibility; Thermal properties
• ISSN: 0379-7112
• DOI: 10.1016/j.firesaf.2016.01.001

The crystals of diethylenetriamine copper(II) sulfate complex (flame retardant) denoted as DETA-CuSO4 have been obtained by direct interaction of solid copper(II) sulfate pentahydrate with diethylenetriamine – DETA (hardener of epoxy resins) and characterized by means of X-ray powder diffraction, infrared spectra (IR) and thermal gravimetric analysis (TGA). The results of TGA reveal that the thermal degradation of DETA-CuSO4 takes place at 290°С, while the maximal temperature of combustion gaseous products amounts to 520°С. DETA-CuSO4 has been used as flame retardant in epoxy-amine polymers (DGEBA/DETA). The thermal behavior and combustibility of modified epoxy-amine composites (DGEBA/DETA-CuSO4) have been investigated using TGA, method of “ceramic tube” (CT) as well as measurement of ignition point and self-ignition point. TGA data confirms that adding DETA-CuSO4 to DGEBA (bisphenol A diglycidyl ether) appreciably improve the thermic stability and anti-flammability of DGEBA/DETA-CuSO4, mainly, owing to chemically interlinking incombustible inorganic salt of copper(II) sulfate with polymeric framework of DGEBA/DETA. Results of CT measurement show that the maximal combustion temperature of gaseous products for DGEBA/DETA in comparison with DGEBA/DETA-CuSO4 goes down from 867°C to 640°C and weight loss decreases from 89.0wt% to 78.6wt%. [Display omitted] •A new flame retardant – diethylenetriamine copper(II) sulfate complex (DETA-CuSO4) has been synthesized.•The DETA-CuSO4 has been characterized by X-ray powder diffraction, IR spectra and TG analysis.•The DETA-CuSO4 has been used for combustibility suppressing of epoxy-amine composites (DGEBA/DETA-CuSO4).•The combustibility and thermal behavior of DGEBA/DETA-CuSO4 have been investigated by TG analysis, method of “ceramic tube” and measurement of ignition point and self-ignition point.