Abstract
This study presents the preparation and characterization of new organic-inorganic pigments based on aluminum-magnesium hydroxycarbonate (LH) and azo dyes. Solvent resistance studies, XRD, SEM, and TGA confirmed the successful formation of hybrid pigments, which were characterized in terms of their physicochemical properties. The new hybrid pigments were applied in acrylonitrile-butadiene (NBR) and ethylene-propylene (EPM) rubber composites and cured with sulfur and peroxide curing systems, respectively. The mechanical properties, dispersion quality, and flame-retardant properties of the NBR/hybrid and EPM/hybrid pigment composites were determined by dynamic mechanical analysis (DMA), SEM, and microscale combustion calorimetry (MCC). Complex experimental investigations revealed that the layered nature of hybrid pigments could improve the barrier ability and flame retardancy of elastomer composites. In comparison to unmodified aluminum-magnesium hydroxycarbonate, the modified LH dye structures contributed to significantly decrease the heat release rate and the total heat release of the NBR and EPM composites, offering a new approach to imparting low flammability to elastomer materials.
Highlights
Over the past few decades, organic dyes based on azo chromophore have been widely applied as coloring agents in textile and polymer technologies
We propose new hybrid pigments obtained by the precipitation of carboxylic azo dyes onto aluminum-magnesium hydroxycarbonate with an Al:Mg weight ratio of 70:30
This paper reported on the preparation of new organic-inorganic pigments through the precipitation of azo dyes onto an aluminum-magnesium hydroxycarbonate host
Summary
Over the past few decades, organic dyes based on azo chromophore have been widely applied as coloring agents in textile and polymer technologies. They owe their popularity primarily to the wide range of colors available and their relatively low price. In order to overcome these problems and provide long-life polymer products, organic dyes are often combined with different inorganic supports such as silica, titanium dioxide, or montmorillonite [1,2,3,4]. Hybrid pigments appear to be an attractive alternative to conventional coloring agents due to the promise of combining coloring ability with the functionality of polymer fillers.
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