NEROX 510 Carbon Black Pigments for Industrial Coatings. Technical Information TI 1392

Transcription

1 NEROX 0 Carbon Black Pigments for Industrial Coatings Technical Information TI 92

2 Introduction For applications in the industrial coatings industry, there is growing demand for black pigments that provide higher and stable jetness. Such pigments also need to be highly stable in coating systems. Figure Typical oxygen-containing groups on the surface of an after-treated carbon black pigment Using a modified process, Orion Engineered Carbons has succeeded in developing the special Furnace Black NEROX 0, which is characterized by a medium primary particle size and a narrow primary particle size distribution. O O Lactone An innovative oxidation process makes it possible to create a relatively high density of oxygen-containing groups on the surface of the carbon black pigments (Figure ), together with a relatively weak acid strength. This results in a lower mill-base viscosity and a higher flocculation stability compared to conventional carbon blacks. OH OH Phenol NEROX 0 has a volatile content of approximately % at 90 C due to a special after-treatment process. This after-treatment leads to better wetting and dispersion properties, lower oil and binder adsorption, and consequently to better stability, higher gloss and lower viscosity in solvent-borne coatings. O OH Carboxyl Classification of NEROX 0 into existing NEROX and PRINTEX grades from Orion Engineered Carbons The NEROX 0 has a lower nitrogen surface area compared to the existing grades NEROX 00 and NEROX 600. The structure (measured by oil absorption number) of NEROX 0 is positioned between the low structure of NEROX 0 and the high structure of NEROX 00. Comparing the coloristic properties of NEROX 0 with NEROX 00, and NEROX 600 in a solvent-borne 2K acrylic PU system, we notice that the NEROX 0 shows the lowest jetness. The undertone of NEROX 0 is moderate bluish and lower compared to NEROX 00 and NEROX 600 (see Figure 2). Table Haze and gloss values of NEROX 0 in a solvent-borne 2K PU coating system (2.2 % total pigment concentration) gloss (60 ) NEROX 0 in 2K PU 84 haze NEROX 0 shows very similar jetness () and a slightly less blue undertone (lower value) compared to the carbon black pigment Mitsubishi MA 00 of the competitor Mitsubishi Chemical Corporation in a 2K acrylic PU system (Figure ). NEROX 0 has also high gloss and low haze values in the tested solvent-borne 2K PU coating system (see Table ). Figure 2 Coloristic values in a 2K PU solvent-borne coating system (2.2 % total carbon black pigment concentration). = 00 log[/y], = M C, M C = 00 {log[x n/x] log[z n/z]+log[y n/y]} NEROX 0 NEROX 00 NEROX 600 2K acrylic PU coating system Figure Coloristic values in a 2K PU solvent-borne coating system (2.2 % total carbon black pigment concentration) NEROX 0 Mitsubishi MA 00 2K acrylic PU coating system

3 2 Comparison of coloristic properties in selected binder formulations out of key markets NEROX 0 was developed mainly for industrial coatings, plastic coatings and wood coatings. To provide guideline formulations for NEROX 0 and recommend suitable dispersion additives, we selected several typical solvent-borne coating systems for these industries: a thermosetting acrylic / melamine stoving enamel (60 % solid content) for general industrial application, a 2K alkyd polyurethane system (0 % solid content) for wood coatings, and a thermoplastic acrylic system (0 % solid content) for plastic coatings. In Figure 4 to 6, jetness and undertone values of NEROX 0 are compared with those found for the competitor grade Mitsubishi MA 00 from Mitsubishi Chemical Corporation in the perspective binder systems. As regards to jetness, undertone, gloss, haze, and fineness of grind, it may be concluded that the coatings based on NEROX 0 are comparable with the coatings based on Mitsubishi MA 00. Figure Coloristic values of NEROX 0 and the competitor grade Mitsubishi MA 00 from Mitsubishi Chemical Corporation in a 2K alkyd polyurethane coating system. 2.4 % total carbon black pigment concentration NEROX 0 Mitsubishi MA 00 2K Alkyd PU coating system for wood coatings Figure 6 Coloristic values of NEROX 0 and the competitor grade Mitsubishi MA 00 from Mitsubishi Chemical Corporation in an acrylic coating system with EFKA 40 from BASF as dispersion additive..8 % total carbon black pigment concentration, 0 % additive (solid) related to carbon black pigment All guideline formulations are given in Chapter. Figure 4 Coloristic values of NEROX 0 and the competitor grade Mitsubishi MA 00 from Mitsubishi Chemical Corporation in an acrylate / melamine stoving enamel with Borchi Gen 04 from Borchers as dispersion additive. 2. % total carbon black pigment concentration, 0 % additive (solid) related to carbon black pigment NEROX 0 Mitsubishi MA 00 Thermoplastic acrylic coating system for plastic coatings NEROX 0 Mitsubishi MA 00 Acrylate/melamine stoving enamel for general industrial coatings

4 Tinting systems Figure Relative tinting strength values (non-rub-out area) of various carbon black pigments in a 2K PU solvent-borne tinting system. Ratio TiO 2:CBP = 00:. Figure 8 Stability (floating behavior) of different carbon black pigments in a 2K PUR tinting system. Left bar: G Y of the non-rub-out area, right bar: G Y of the rub-out area. Ratio TiO 2:CBP = 00: ; G Y = 00 log[ / Y] rel. tinting strength (%) NEROX 0 Mitsubishi NEROX 00 NEROX 600 MA 00 2K acrylic PU white blend G Y non-rub-out NEROX 0 Mitsubishi MA 00 rub-out NEROX 00 NEROX 600 In tinting systems NEROX 0 features high tinting strength and good stability behavior caused by the after-treatment of the carbon black pigment. Figure demonstrates the relative tinting strength of NEROX 0, Mitsubishi MA 00 from Mitsubishi Chemical Corporation, NEROX 00 and NEROX 600 in a 2K PU white blend. As a reference the relative tinting strength was set to 00 % for Mitsubishi MA 00. The tinting strengths of NEROX 0 and the competitor grade Mitsubishi MA 00 approximate each other closely. The stability of the carbon black pigments is illustrated in Figure 8, where the left bar shows the G Y value of the non-rub-out area, and the right bar indicates the G Y value of the rub-out area. The G Y value gives the grey color shade independent from the undertone. In the non-rub-out area, a separation between coarse TiO 2- pigments and fine carbon black pigments occurs in the case of bad stabilization. To illustrate the pigment separation a post-dispersion by thumb is made in the rub-out area in the wet coating film. Finally the grey shades of the rub-out area and the non-rub-out area are compared. The smaller the difference in grey shade, the better is the stabilization of the carbon black pigments in the coatings film. Figure 8 represents good pigment stability in the wet coating film. 4

5 4 Influence of dispersion time Figure 9 Influence of the dispersion time on the floating behavior and the relative tinting strength of NEROX 0 in an alkyd / melamine stoving enamel white blend. Ratio TiO 2:CBP = 00:. % min. 0 min. 4 min. dispersion time rel. tinting strength (%) g behavior (%) The influence of the dispersion time on the floating behavior and the development of the relative tinting strength of NEROX 0 in an alkyd / melamine white blend are shown in Figure 9. The optimal tinting strength can be obtained in the laboratory scale after a dispersion time of 4 minutes in a Skandex disperser. The floating behavior of the carbon black pigments in the white film also increases with increasing dispersion time. When dispersing the particles, the carbon black agglomerates are destroyed and these particles become finer. The size difference between TiO 2 pigments and carbon black particles increases. The bigger the size difference between white and black pigments, the higher is the floating tendency. Influence of the carbon black pigment loading on the mill-base viscosity Figure 0 Increase of mill-base viscosity with increasing carbon black pigment loading in alkyd / melamine stoving enamel. The -values of the let down stay on the same level when increasing the carbon black pigment loading of the mill-base. viscosity at 0/s [mpas] % 20% 0% 40% 0% amount Carbon Black Pigment related to alkyd binder solid NEROX 0 Mitsubishi MA 00 When the carbon black pigment loading in alkyd / melamine stoving enamel is increased from 0 % to 0% (carbon black pigment amount related to binder (solid)) in the mill-base, an increase in viscosity can be observed. Figure 0 presents the mill-base viscosities of NEROX 0 as dark blue bars and the mill-base viscosities of Mitsubishi MA 00 are shown as light blue bars. The mill-base viscosity of the competitive product is increasing faster, to up to 2900/s mpas, when the mill-base is loaded with 0% CBP related to binder (solid). With NEROX 0 it is possible to load the mill-base with a high content of carbon black pigment at an easy-to-handle mill-base viscosity. The values, as well as gloss, haze, and the fineness of grind are very stable in the tested range of pigment loading.

6 6 Conclusion Orion Engineered Carbons new carbon black pigment NEROX 0 rounds off the product range of Regular Color Furnace Black Pigments. The NEROX 0 is manufactured by means of an innovative after-treatment process that leads to better wetting and dispersion properties, as well as lower oil and binder adsorption of the pigment in solvent-borne coating systems. Coloristic measurements in masstone coating systems typically used for industrial coatings, plastic coatings, and wood coatings show values comparable to a competitor s product widely used in these markets. Guideline formulations with suitable dispersion additives are provided within this technical bulletin. In tinting systems NEROX 0 exhibits a high tinting strength and a good stability because of the modified surface that is created in the after-treatment process. The increase of relative tinting strength as a function of dispersion time is also presented. Based on the low mill-base viscosity, high pigment loadings are possible without degrading the coloristic properties of the coating. This opens the way to more cost-effective coating production. 6

7 Guideline formulations 2K acrylic PU system Degalan VP 4, 60 % solid, from Evonik Röhm GmbH % let down 64.8 % 6 % Butylacetate 98 % 2.6 % Degalan VP 4, 60 % solid, from Evonik Röhm GmbH. % carbon black pigment.6 % Thinner 22. % Desmodur N, % solid, from Bayer Material Science 6 % Alkyd / melamine stoving enamel Alkydal F0 SN, 60 % solid, from Bayer Material Science % let down 6.4 % 22 % Shellsol A 22. % Alkydal F0 SN, 60 % solid, from Bayer Material Science carbon black pigment 0. % Maprenal MF 800 / IB, % solid, from Ineos Melamines 6. % 24 % Thinner. % Acrylic / melamine stoving enamel % let down YP2428, 60 % solid, from YuanBang resin 6. % 8. % Xylene 2.4 % YP2428, 60 % solid, from YuanBang Resin 9 % Borchigen 04, 00 % solid, from Borchers.4 % Etermino , 60 % solid, from Eternal Chemical 22 % carbon black pigment. % Thinner 20. % 2K alkyd PU system Eterkyd 06-X-0, 0 % solid, from Eternal Chemical % let down 4. % 2. % Xylene 4. % Eterkyd 06-X-0, 0 % solid, from Eternal Chemical 9. % carbon black pigment.4 % Thinner 20. % Desmodur L, % solid, from Bayer Material Science 8. % Thermoplastic acrylic system ETERAC 9-TB-0, 0 % solid, from Eternal Chemical % let down.9 % 20 % Xylene. % ETERAC 9-TB-0, 0 % solid, from Eternal Chemical 6 % EFKA 40, 0 % solid, from BASF.4 % Thinner 24 % carbon black pigment 9 %

8 The Americas Orion Engineered Carbons LLC 40 Magnolia Cove Drive Suite 06 Kingwood, TX 4 USA Europe / Middle East / Africa Orion Engineered Carbons GmbH Hahnstrasse Frankfurt am Main Germany Asia / Pacific Orion Engineered Carbons Co., Ltd. Technology Center 94 Galsan -Dong, Bupyeong-gu Incheon 40-08, Korea phone fax pigmentblacks@orioncarbons.com phone fax phone fax All information and statements contained herein are believed to be accurate, but Orion Engineered Carbons LLC, its agents and/or affiliates make no warranty with respect thereto, including but not limited to any results to be obtained or the infringement of any proprietary right. Improper and unauthorized use or application of such information or statements or the material or systems described herein is at user s sole discretion and risk, and consequently user acknowledges that Orion Engineered Carbons LLC shall bear no responsibility or liability for same. Nothing herein shall be construed as a license of or recommendation for use which infringes any proprietary right. All sales are subject to Orion Engineered Carbons LLC s Standard Terms and Conditions of Sale, including but not limited to its Limited Warranty. 202 Orion Engineered Carbons LLC OEC-094/9-202