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Home  > Raw materials & technologies  > Applications  > Decorative coatings  > Pigments colour shoulder to shoulder

Wednesday, 18 September 2019
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Raw materials & technologies, Applications, Decorative coatings

Pigments colour shoulder to shoulder

Wednesday, 11 September 2013

A new technology for multicolour paints was investigated: Basically it encapsulates paint droplets what leads to a stable colour coexistance side-by-side.

Different pigments with different colours coexist next to each other in one solution

Source: Inna Felker/Fotolia

Different pigments with different colours coexist next to each other in one solution

Source: Inna Felker/Fotolia

Multicolor Paints (MCP) are already known for a long time. However, older technologies have been used with moderate success, only.
A current advanced multicolour technology will be presented at the European Coatings Conference "Facade coatings and plasters". It is based on a low VOC, water-in-water MCP formula, that benefits in several respects from the unique rheological action principle of a clay colloid dispersion. It utilizes the unique ability of a synthetic layered silicate (hectorite) to form concentrated low viscosity colloids and to encapsulate the paint droplets: stable paint droplets of different colour coexist side-by-side without the phases mixing within a single vessel.

A novel approach to multicolour technology

Anette Lork, Rockwood Additives, Germany presents that the formulation could be improved by a combination of synthetic layered silicate with organo-modified natural layered silicate in the colloidal continuous clay mineral phase, thus, optimizing stability and performance. This concept opens up new application opportunities, for example imitation granite finishes that closely match real stone. The MCP is designed for interior uses and spray application.

Attractive colour concepts

Increasing attention in stone effect-imitating MCP and attractive colour concepts required a re-formulation of the existing guide formula. Changes of raw materials in MCP formulations, as well as variations in small-scale production processes do have an impact on visual effects, e.g. droplet size and morphology and especially on multicolour paint stability.
High-resolution microscopic studies on freeze dried liquid MCP specimen are not only useful for visualizing paint droplet morphologies, they also provide access to a better understanding of the stabilising mechanisms of the clay mineral gel in the liquid MC paint structure.

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