Sustainable cardanol-based multifunctional carboxyl curing agents for epoxy coatings: Si–S synergism

High-performance epoxy coatings were prepared by crosslinking commercial diglycidyl ether of bisphenol-A with silicon–sulfur containing di- and tetra-functional carboxyl curing agents based on cardanol. The curing agents were synthesized and products were analyzed by chemical, spectroscopic, and chr...

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Bibliographic Details
Published in:JCT research 2020-09, Vol.17 (5), p.1217-1230
Main Authors: Wazarkar, Kunal, Sabnis, Anagha
Format: Article
Language:English
Subjects:
Bisphenol A
Chemistry and Materials Science
Chromatography
Contact angle
Corrosion and Coatings
Corrosion prevention
Crosslinking
Curing
Curing agents
Electrochemical impedance spectroscopy
Epoxy coatings
Epoxy resins
Flame retardants
Industrial Chemistry/Chemical Engineering
Low carbon steels
Materials Science
Optical properties
Performance evaluation
Polymer Sciences
Silicon
Sulfur
Surfaces and Interfaces
Synergistic effect
Synthetic products
Thin Films
Tribology
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Summary:High-performance epoxy coatings were prepared by crosslinking commercial diglycidyl ether of bisphenol-A with silicon–sulfur containing di- and tetra-functional carboxyl curing agents based on cardanol. The curing agents were synthesized and products were analyzed by chemical, spectroscopic, and chromatographic techniques. In the next part, coatings were formulated by varying the ratio of epoxy resin to curing agents on equivalent basis, such as 1:0.6, 1:0.8, and 1:1. The coatings were applied on mild steel panels and cured at 150°C for 30 min. The resultant coatings were evaluated for performance properties including mechanical, chemical, optical, thermal anticorrosive, and flame retardant properties. It was observed that with an increase in concentration of silicon–sulfur containing curing agents, water contact angles of the coatings substantially increased. Moreover, electrochemical impedance spectroscopy, Tafel analysis, and salt spray studies revealed that anticorrosive properties of the coatings improved with an increase in concentration of silicon and sulfur. In spite of synergistic effect of silicon–sulfur, only marginal improvement in flame retardant properties was observed. Graphic abstract
ISSN:1547-0091
1935-3804
2168-8028
DOI:10.1007/s11998-020-00341-4