Convective and radiant (IR) curing of bulk and waterborne epoxy coatings as thin layers. Part II: Infrared curing

Abstract

In the first part of this paper, a method for studying the curing of 100‐μm‐thick epoxy‐based layers on steel substrates was described. In this second part, we extend our study to radiative (infrared) heating conditions. A simple waterborne epoxy reactive system based on a diglycidylether of bisphenol‐A prepolymer and a polyether triamine was used. The chemical kinetics during infrared heating were studied with the reaction kinetics recorded during convective heating. A second order autocatalytic model described the data. The curing mode had no significant influence on the heating kinetics but the heating rate had a significant influence on the curing kinetics. Higher heating rates can be achieved by infrared heating conditions compared with convective heating. The gelation phenomenon was changed for infrared conditions. Microdielectrometry can be used to record in situ the extent of reaction of the epoxy reactive system for thin layers during radiant heating.

Synthesis, characterization, and performance evaluation of hard, anticorrosive coating materials derived from diglycidyl ether of bisphenol A acrylates and methacrylates

“…Epoxy resins are an important class of thermosetting polymers that are chiefly used as adhesives, laminates, boards, molds for casting, and composite materials in the aerospace and aircraft industries 1–4. In addition to these applications, these resins find substantial application in high‐performance surface coatings 5, 6. Coatings from epoxies have been found to show marked resistance to chemicals and corrosive environments.…”

Synthesis of ultraviolet curable bisphenol‐based epoxy acrylates and comparative study on its physico‐chemical properties

“…Bruker Advance 400 Hz was used to perform 13 C-NMR spectroscopy on all the BEA resins. The sharp peaks and broad chemical shifts without overlapping help identify the type of carbon atom, thus confirming the backbone structure of the compound.…”

“…[8][9][10][11] Additionally, these resins have found considerable development in the field of high-performance surface coatings owing to their resistance to chemicals and corrosive environments. 12,13 These benefits from epoxy lead to the development of hybrid epoxy acrylate photosensitive resin. Acrylate functional monomers deliver outstanding performance in the external environment and generate quick reactivity.…”

The Effect of Oven-Heat Flux on Powder-Coating Issues of Sheet Molding Compound Panels

“…A mathematical model for the heating of powder-primer-coated automotive panels with simultaneous curing of the primer was considered on the basis of commonly practiced methods. − The main purpose of the model was to investigate whether the SMC panels are overheated in the plant ovens that are typically designed and optimized for sheet metal panels. The possibility of overheating of the SMC panels becomes more significant when high intensity IR heating is used to melt and cure the powder layer.…”