| Résumé : |
Achieving maximum performance with an aqueous topcoat is the goal of both the chemical supplier and the industrial finisher.Interestingly, each can play a critical role in the success or failure of a topcoat.This is because there are two key elements that directly affect performance: one is the topcoat design and the other is the topcoat application.The topcoat design is typically the responsability of the chemical manufacturer.The industrial finisher entrusts the supplier to carefully design the topcoat.Components of an aqueous topcoat that require optimization are: all aspects of the polymer(s), the coalescent package and the flow package.The chemical supplier, on the other hand, entrusts the finisher to optimize the topcoat application parameters such as: basecoat performance, topcoat film thickness,formulated topcoat co-binders,plating,drying time before testing,temperature of drying and use of crosslinkers. It is the study of these application parameters that may be of most interest to the industrial finisher yet possibly the least quantified by the supplier.In this paper, we explore the effect of each of these application parameters as it applies to one key variable-wet rub resistance.Wet rub is a highly sought after property and is appropriate for study because it is one that has been affected by the industry's switch from solvent to water systems. |
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Improving the performance of aqueous topcoats - Technical note in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 6 (06/1993)
