Technical
Deep black with Nuosperse FX 7500W Aqueous carbon black pigment concentrates are often challenging for the formulators. By the selection of suitable dispersing agents, the colour acceptance, pigment stability as well as the viscosities during production and storage can be optimised.
A
lso graying of the resulting coatings formulated with black colourant is often an issue, which can be avoided by a proper stabilisation of the pigments using the right dispersants. NUOSPERSE® FX 7500W is a polymeric dispersing agent for aqueous industrial applications which fulfils these requirements. Due to various anchoring groups within the polymeric molecule structure, NUOSPERSE® FX 7500W can be used to properly disperse and stabilise all inorganic and organic pigments besides carbon black. Unwanted flocculation of the dispersed pigments has been avoided by sterical hinderance. This typically results in pigment pastes of high stability, a wide binder compatibility and the ability to be used in highly glossy systems. The addition of a carbon black based colourants into a transparent base coating displays the benefits with NUOSPERSE® FX 7500W. In comparison to a commercially available market reference grade, a much deeper black and higher gloss can be obtained.
FW200
Figure 2. White acrylic coating equipped with 3% black colourant. Figure 1: Transparent acrylic coating equipped with 3% black colourant after storage of eight months (Left: NUOSPERSE® FX 7500W; Right: Market reference) In case a white coating has been equipped with a carbon black based colourant utilising NUOSPERSE® FX 7500W, also a very deep black is the result (Figure 2). It is additionally to be observed that the sample with NUOSPERSE® FX 7500W is clearly outperforming the tested market reference dispersant. Figure 2: White acrylic coating equipped with 3% black colourant. c
Monarch 1300
Monarch 1400
Emperor 2000
Raven 5000 Ultra II
Figure 1. Transparent acrylic coating equipped with 3% black colourant after storage of eight months (Left: NUOSPERSE® FX 7500W; Right: Market reference) In the case of a white coatings being equipped
21 | Coatings SA
