International. In a study carried out by researchers at the Amirkabir University of Technology (Iran), the desirable color characteristics of cationic dyes and the good barrier properties of organoclays have been combined by the synthesis of hybrid dye and clay nano pigments.
Synthesis was performed by cation exchange of two cationic dyes (i.e. basic blue 9 and basic yellow 87) and commercial organocylets (Cloisite 15A, 20A and 30B). Different amounts of hybrid dye clay nano pigments (DCNPs) were then incorporated into an epoxy coating and their corrosion resistance behaviors were investigated.
The results showed that the degree of intercalation/exfoliation of dcNPs was greater than that of organoarcillas. In addition, DCNPs based on Cloisite 20A were found to have the best dispersion properties between the different nanoclays.
It was revealed that the corrosion resistance of coatings containing DCNP (based on Cloisite 20A) was superior compared to coatings containing only Cloisite 20A. Finally, the results demonstrated the technical feasibility of preparing colored epoxy coatings with superior corrosion resistance by incorporating DCNP (in the range of 1-5% by weight) in epoxy matrix.
Source: https://www.sciencedirect.com
