Beatriz del Amo

The use of calcium resinate in the formulation of soluble matrix antifouling paints based on cuprous oxide

Abstract In a previous paper, the authors studied the changes produced in the film composition of antifouling paints based on WW rosin/chlorinated rubber during immersion in artificial sea water for different periods. The results obtained established that the free resinic acids were neutralized forming resinates and also that film dissolution took place fundamentally by solubilization of these resinates. Following these conclusions, antifouling paints based on calcium resinate, calcium resinate/chlorinated rubber and WW rosin/chlorinated rubber were formulated and made in a laboratory ball mill of 3.3-1 capacity. The experimental results of immersion raft trials (26 months) were statistically treated (factorial design 2×2×2×3×4, 96 samples prepared and tested in duplicate) and the conclusions then correlated with binder acid values obtained from laboratory analysis. The study showed the influence of composition variables (type of soluble resinous material, resinous material/chlorinated rubber ratio and binder content) and also the importance of some manufacturing variables (order of incorporation of the resinous material and toxicant, and cuprous oxide dispersion time) on the biocidal characteristics of the paints.

Estudio de las Propiedades Anticorrosivas del Benzoato de Hierro (III) en Pinturas Base Solvente

La accion inhibidora del benzoato de hierro en electrodos de acero SAE 1010 en contacto con una suspension acuosa fue estudiada mediante ensayos electroquimicos. Paralelamente, la eficiencia anticorrosiva de este producto incorporado a cubiertas organicas base solvente fue evaluada mediante ensayos de envejecimiento acelerado (camara de niebla salina y de humedad). La evolucion del comportamiento protector de la cubierta aplicada sobre paneles de acero pintados e inmersos en una solucion 0.5M de NaClO4 fue periodicamente monitoreada por espectroscopia de impedancia electroquimica. Los resultados obtenidos indican que las pinturas formuladas con benzoato ferrico presentan una capacidad anticorrosiva comparable a las formuladas con fosfato de cinc.