Thermal stability of magnesium-rich primers based on glycidyl carbamate resins

Ravindran, Neena; Chattopadhyay, D. K.; Zakula, Autumn D.; Battocchi, Dante; Bierwagen, Gordon P.

doi:10.1016/j.polymdegradstab.2010.04.015

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…76 A study of the thermal stability of a magnesium rich primer system using the amine cured silane modified glycidyl carbamate resin as a binder system showed that the coatings had exceptionally high thermal stability and resulted in a significant amount of intact char residue after exposure to high temperatures. 77 In another study, a portion of the isocyanate groups in a glycidyl carbamate resin synthesis was replaced with an amino silane, resulting in a resin having both epoxy functional groups and silane groups. 78 Curing of the coatings was through amine curing agents as well as through the moisture-catalyzed sol-gel reaction.…”

Section: Hybrid Sol-gel Systemsmentioning

confidence: 99%

Glycidyl carbamate functional resins and their applications: a review

Webster

2020

Polymer International

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The glycidyl carbamate functional group consists of an epoxide adjacent to a carbamate or urethane. Glycidyl carbamate functional resins are compounds that have two or more glycidyl carbamate groups. Glycidyl carbamate resins can be cured through the epoxy groups with any of the typical curing agents currently used for epoxy systems such as amines, anhydrides or phenolics. An advantage of glycidyl carbamate resins is that the end user can use epoxy curing chemistry to form thermosets and obtain a polyurethane without having to handle isocyanates. This review surveys the peer-reviewed and patent literature on glycidyl carbamate functional resins and their applications. Glycidyl carbamate compositions have been explored for use in adhesives, sealants, elastomers and coatings. In most of the reported studies, glycidyl carbamate resins offer improved adhesion, flexibility and faster curing compared to conventional epoxy resin systems, making it an attractive alternative thermosetting polymer system.

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Section: Hybrid Sol-gel Systemsmentioning

confidence: 99%

Glycidyl carbamate functional resins and their applications: a review

Webster

2020

Polymer International

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“…While most Mg-rich primers have been formulated with either thermoplastic epoxy resins or thermosetting epoxy-amine systems, Ravindran et al reported employing a silane-modified glycidyl carbamate binder crosslinked with a polyamide or a polyamine as the continuous phase of their Mg-rich primer [53]. Trimethoxy aminosilane was reacted with hexamethylene diisocyanate-based biuret (10%, 15% and 20% silane modification) and the product was reacted with glycidol to synthesize the silane-modified binder.…”

Section: Performance and Mechanism Of Corrosion Protection By Mg-richmentioning

confidence: 99%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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Abstract:Magnesium is electrochemically the most active metal employed in common structural alloys of iron and aluminum. Mg is widely used as a sacrificial anode to provide cathodic protection of underground and undersea metallic structures, ships, submarines, bridges, decks, aircraft and ground transportation systems. Following the same principle of utilizing Mg characteristics in engineering advantages in a decade-long successful R&D effort, Mg powder is now employed in organic coatings (termed as Mg-rich primers) as a sacrificial anode pigment to protect aerospace grade aluminum alloys against corrosion. Mg-rich primers have performed very well on aluminum alloys when compared against the current chromate standard, but the carcinogenic chromate-based coatings/pretreatments are being widely used by the Department of Defense (DoD) to protect its infrastructure and fleets against corrosion damage. Factors such as reactivity of Mg particles in the coating matrix during exposure to aggressive corrosion environments, interaction of atmospheric gases with Mg particles and the impact of Mg dissolution, increases in pH and hydrogen gas liberation at coating-metal interface, and primer adhesion need to be considered for further development of Mg-rich primer technology.

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“…Apart from that, an essential advantage of GC resins is the presence of self-cross-linking reactions of epoxide groups toward the active hydrogens of the carbamate, and the secondary hydroxyl group derived from the ring-opening reaction of epoxide group. , The ring-opening reaction of an epoxide group would generate a secondary hydroxyl group, which reacts with other epoxide groups to produce a cross-linked network, thereby resulting in a high cross-linking density in the epoxy resin . Although GC resins provide excellent physical and chemical properties of epoxy thermosets, the preparation of GC resins typically requires an isocyanate reagent as a starting material to react with glycidol. − In addition, the use of isocyanate compounds is regarded as an environmental concern because most of the commercially available isocyanate reagents are produced from hazardous phosgene reagents.…”

Section: Introductionmentioning

confidence: 99%