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Minimising rub-out in tinted interior wall paints
A recent Bachelor’s thesis focused on the development of a tintable interior wall paint with improved rub-out resistance. The study explored pigment stability and formulation strategies compatible with an existing tinting system.
A Bachelor’s thesis has investigated the formulation of a tintable interior wall paint, aiming to develop a new base product for the tinting system of einzA Farben. Until now, the company’s product was only available as a non-tintable white paint. The goal was to create a tintable equivalent matching the white version in terms of price segment and wet abrasion resistance class.
The central focus of the study was the rub-out effect – a common defect in tinted coatings, where uneven pigmentation occurs when the surface is rubbed while wet. Two particularly challenging tinting pastes were examined: one based on an organic pigment, the other on an inorganic pigment.
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Influence of Binder and Additives
Beyond pigment selection, the research analysed the impact of various formulation components, including binders, dispersing agents, wetting agents and rheology additives. These ingredients significantly affect pigment distribution and, consequently, the paint’s resistance to rub-out.
The findings show that optimising the additive package can substantially improve rub-out performance. Based on the results, a new formulation was proposed that meets the company’s requirements for a tintable paint base while remaining compatible with the existing tinting system.
Source: Müller, Yannik: Vermeidung von Rub-Out in einer abgetönten Innenwandfarbe (Avoiding Rub-Out in a Tinted Interior Wall Paint), Bachelor’s thesis, 05 Dec 2024, Hochschule Niederrhein. Supervisor: Prof. Dr. Matthias Schumacher.
