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Abstract
In this paper, we study the effect of Sodium Hexametaphosphate (SHMP) on the Nitrocellulose butanol wet for the emulsification and stability of the resulting colloid. Nitrocellulose wetted with butanol is used in lacquers for high-gloss automotive finishes and leather finishing and plays a pivotal role in diverse industries due to its unique glossing properties. We investigated the rheological properties of this Nitrocellulose-butanol wets with and without Sodium Hexametaphosphate at various temperatures. We performed multiple tests such as oscillatory rheometry, steady shear rheometry, and time sweep tests at various temperatures to understand these solutions' temperature characteristics, shelf-life, and stability with time. Furthermore, other tests evaluated the stability and performance of lacquer samples, with a focus on SHMP's impact. Zeta potential measurements indicated a notable enhancement in stability, attributed to SHMP's ability to augment electrostatic repulsion between particles and helps prevent the aggregation of nitrocellulose particles. Additionally, pH measurements demonstrated a decrease in acidity for samples containing SHMP, indicating its efficacy in curbing chemical reactions leading to increased acidity. Viscosity tests illustrated that lacquer samples with SHMP maintained consistent viscosity over time, while those without experienced significant decreases. The wet rub test affirmed SHMP's role in enhancing resistance to color transfer, indicative of superior film adhesion and performance in real-world settings. Furthermore, gloss evaluations highlighted SHMP's contribution to a shinier and more reflective surface, augmenting the overall appearance of the lacquer film. These findings underscore the critical significance of additives like SHMP in fortifying stability, durability, and aesthetic properties of lacquer coatings, holding promise for diverse applications across industries.
