Paints and Rheology

Rheology is the branch of science that examines the flow and spreading capability of liquids. The concept of rheology was first documented in the 17th century in "Theory of Elasticity," a book written by Robert Hooke to model the rheological properties of solids. Furthermore, rheology in the paints sector is fundamentally associated with viscosity, but this creates misunderstandings. Rheology is not always directly proportional to viscosity. Viscosity is the resistance a liquid exhibits to flow; rheology, on the other hand, relates to how a liquid behaves in terms of spreading capability. For example, one product may have a viscosity of 120 KU with high spreading capability, while another product may have a viscosity of 100 KU with weaker spreading capability. One might think that whichever product has lower viscosity will have better spreading capability, but this is an incorrect perception.

Rheology is a fundamental quality factor in paint that directly influences performance but receives insufficient attention. Specifically, paint with correct rheology can provide better spread, better coverage, better gloss, better coverage area, and better stability.

Of course, decorative products are applied with negative spread on their surfaces to achieve a decorative appearance, which is again directly related to the rheological properties of the products. Our products contain additives in powder and liquid form to regulate rheological behavior. In some formulations, products in both forms can be used, while in others, suitable solutions can be produced with only one of these products. We must first plan what rheological behavior we expect from the product, then determine suitable products and required quantities accordingly. For example, in products where we do not want spreading, such as decorative products and texture paints, we must provide ideal rheology with an additive that will not increase spreading. Rheology in paint does not interact only with rheology agents but with many inputs. For instance, a high-level dispersant or an over-used dispersant, or over-used talc also affects rheology and weakens the product's spreading capability. In fact, these products are not rheology agents, but they are inputs that directly affect rheology. If you wish to regulate rheological behavior related to your products, as Pınar Kimya we can produce significant solutions for you. Harun Reşit Zincir General Manager Pınar Kimya