Black PreparationsIt is generally known that pigment black powders have to be dispersed very extensively to achieve development of coloristic properties. Degussa is now able to offer a preparation in which the pigment black powder has been incorporated into an aldehyde resin matrix by a newly developed production process. The resulting pigment preparation is in granular form, providing an easy-to-handle, zero-VOC, dust-free preparation having excellent pigment stability. INXEL™ pigment preparations represent the next-generation pigment providing high quality and easy to-handle solutions to paint manufacturers, and they are designed for solvent-based and solvent-free coatings systems.
Technical Fundamentals of INXEL™ Pigment PreparationsDegussa pigment blacks are incorporated into an aldehyde-based binder using a proprietary production process. This resin is soluble in most commonly used solvents and has broad compatibility with many coating raw materials, such as:
- alkyd resins;
- cellulose nitrate;
- cellulose acetobutyrate;
- vinyl chloride copolymers;
- chlorinated rubber;
- melamine-formaldehyde resins;
- aromatic and aliphatic epoxy resins;
- hydrocarbon resins; and
- phthalate plasticizers.
In the following section, examples for the use of INXEL pigment preparations in different acrylic coatings systems are given. Relevant coating parameters achieved with these pigment preparations, like fineness of grind, are always similar to values obtained with powder pigments dispersed in the traditional way. Regarding the coloristic properties, INXEL pigment preparations showed significant improvement. In addition, excellent stabilization of the pigments was obtained in the coating systems evaluated.
INXEL Pigment Preparations in Acrylic SystemsIn high-performance coatings, acrylic resins are widely used in different coating formulations. In this test series hydroxyl functional acrylates were crosslinked with the aliphatic isocyanate Desmodur® N 75 (Bayer Material Science). To evaluate the properties of INXEL pigment preparations five commonly used acrylate resins were chosen, as shown in Table 1.
ConclusionINXEL pigment preparations show excellent compatibility in all acrylate resins that were evaluated. The jetness values were always comparable or even higher compared to the corresponding powder pigment. The strong blue undertone in masstone applications and very good rub-out performance in tint demonstrate the excellent stability of the pigment preparations. In addition to the acrylate resins, tests in alkyd and polyester systems were also conducted. Very positive results were obtained for these systems also. Meanwhile, various preparations based on Degussa pigment blacks can be offered in different jetness ranges. Step by step the color range will be widened.
This paper was presented at the Nürnberg Congress held during the European Coatings Show, Nürnberg, Germany, May, 2007 and organized by the Vincentz Network. See firstname.lastname@example.org.
Benefits of the new INXEL Pigment Preparations
The tests in acrylate, alkyd and polyester systems have shown the broad compatibility of INXEL pigment preparations in various coatings systems. Beside the significantly reduced dispersing time, INXEL pigment preparations have shown comparable or even better coloristic values and stability. To sum it up, INXEL pigment preparations provide the following benefits:
- Zero VOC;
- No need to grind pigments;
- Significant reduction in dispersion time;
- Excellent pigment stabilization providing very good color development;
- Absolutely dust-free handling;
- Very precise granule metering;
- Very good solubility in common solvents;
- Compatible with most binders for solvent-based systems.