Abstract
Inorganic extenders are important constituents of 2K thermosetting epoxy-amine coatings and their physical properties play an important role in the final properties of the organic coatings. The effects of extender particle size and loading (i.e., the amount of extender in component A or in the total formulation) on the glass transition temperature (Tg) of model epoxy-amine coatings were studied in this work with differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The obtained results show that the particle size and loading of feldspar particles (from 25 wt% to 70 wt%) do not influence the glass transition temperature of the model epoxy-amine coating significantly. In general, the smaller the particle size the lower the glass transition temperature of the coating but this depression in Tg seems negligible when seen relative to the change in extender particle size. Similar observations are reported for two model coatings having the same lamda (Λ) value but with silica of very different particle sizes (i.e., nanosilica and micron sized silica).
Highlights
Among thermosetting polymers, 70% of the market share is captured by epoxy resins and 60% of the globally produced epoxy resins is employed in the coatings industry due to their low shrinkage during cure, good adhesion with various substrates, excellent corrosion and chemical resistance, high strength and durability, and good compatibility with numerous commercially important materials
When using epoxy resin cured with piperidine and silica nanoparticles of 20 nm and 80 nm average diameter, the results reported by Liang et al [11] were similar to Dittanet et al [3]
Epoxy resin used in this work was Epokukdo YD-128 obtained from the Kukdo Chemical Co., Ltd., Korea, which is a liquid type standard epoxy resin derived from bisphenol-A with epoxy equivalent weight (EEW) of 187 g per equivalent (g·eq−1 )
Summary
70% of the market share is captured by epoxy resins (excluding polyurethanes) and 60% of the globally produced epoxy resins is employed in the coatings industry due to their low shrinkage during cure, good adhesion with various substrates, excellent corrosion and chemical resistance, high strength and durability, and good compatibility with numerous commercially important materials. Commercial epoxy coatings can be 1K or 2K (i.e., 1 component or 2 components, respectively, with K used as an abbreviation of the German word for component). In 2K epoxy coatings, generally, the component containing the epoxy resin (along with other additives like solvent(s), pigment(s), defoaming agent etc.) is termed as the Component A while the second component, termed as Component B, contains the hardener or curing agent. For liquid epoxy coatings intended to cure at ambient temperatures and below, amine functional curing agents are most widely used. The type of the epoxy resin and curing agent used along with the curing conditions can have a significant effect on the final properties of the coating [1,2]
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