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Focused. Innovative. Responsive. Carbon Black Pigment XPB 255 for solvent-borne 2K-high-solid systems Technical Information 1472

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Page 1: Carbon Black Pigment XPB 255 for solvent-borne 2K-high ... · PDF fileCarbon Black Pigment XPB 255 for solvent ... treatment enhances wetting and dispersion properties. ... By using

F o c u s e d. I n n o v a t i v e. R e s p o n s i v e .

Carbon Black Pigment XPB 255for solvent-borne 2K-high-solid systems

Technical Information 1472

Page 2: Carbon Black Pigment XPB 255 for solvent-borne 2K-high ... · PDF fileCarbon Black Pigment XPB 255 for solvent ... treatment enhances wetting and dispersion properties. ... By using

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Table 1Formulation, which was tested for this publication

Mill-base for 2k-high-solid coating system

Desmophen® NH 1420, 100%(from Bayer MaterialScience) 65.0 g

Methoxypropylacetate, MPA 7.4 g

Disperbyk® 163 (from BYK) 11.3 g

Carbon black pigment 16.3 g

Total 100.0 g

Let down for 2k-high-solid coating system

Mill-base 67.8 G

Desmodur® N 3600(from Bayer MaterialScience) 32.2 g

Total 100.0 g

Table 2Calculated values for the testing formulation

Ratio binder : Carbon black pigment 80 : 20

Ratio carbon black pigment: dispersion agent 100 : 70

Ratio binder : isocyanate (solid : solid) 100 : 73

Solid content of mill base 87.5%

Solid content of formulation 91.5%

Over the last decade, 2K-high-solid formulations have grown in popularity. One of the problems facing high-solids coatings is controlling viscosity increase, while maximizing jetness. Finer particle sized carbon black pigments, which are necessary for highest jetness, always resulted in a strong viscosity increase, because of the large surface area.

Orion Engineered Carbons has developed a new carbon black pigment that is able to further improve the viscosity behavior of a high jet carbon black pigment in a 2K-high solid formulation based on amino functional binder (Desmophen® NH 1420) and aliphatic polyisocyanate (Desmodur ® N 3600). The dispersion agent Disperbyk® 163 and methoxypropylacetate as dilution were used. The carbon black pigment XPB 255 can be characterized by a very small mean primary particle size anda narrow particle size distribution. This combination results invery high jetness and a deep blue undertone. Its special after-treatment enhances wetting and dispersion properties.

The testing formulation (see Table 1) used in this study was prepared by initially wetting the carbon black pigment with binder and solvent by means of a lab dissolver (Pendraulik LR 34, 5 min, at a peripheral speed of 8.4 m/s). Afterwards the mill base was dispersed with a standard lab shaker, (Lab disperser DAS 200 or BA S-20) for one hour using 550 g steel beads (2 mm diameter) as grinding media. After the grinding process all grindometer values of the coatings were less than 10μm.

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Figure 1Viscosity behavior of COLOUR BLACK FW 200 and XPB 255 after 24 h storage for deaeration of the coatings

XPB 255 COLOUR BLACK FW 200

70080 167 800 167 80

1000

1300

1600

1900

2200

Share rate [1/s]

Dyn

amic

vis

cosi

ty [m

Pas]

starting viscosity

finishing viscosity

Viscosity behavior

In Figure 1, the viscosity profiles of COLOUR BLACK FW 200 and XPB 255 are shown. The values were measured using a plate-cone viscometer at different shear-ratios (HAAKE Viscotester® VT 550). After 24 h storage time we measured among the largest shear force (highest shear rate) the lowest viscosity. Upon subsequent reduction of the shear rate, a slight increase in viscosity was observed. Compared to COLOUR BLACK FW 200, XPB 255 shows higher viscosity in the beginning but strong reduction during mechanical stress and less increase of viscosity after decreasing

the shear force again. This behavior provides the following benefits for the user:

• better storage stability

• less danger of sedimentation

• strong viscosity reduction during stirring

• easy adjustment of viscosity, because of less increase of viscosity after reducing mechanical stress

• higher mill base loading

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Gloss (20°) and haze

Beside the outstanding performance on jetness MY and undertone dM XPB 255 has also excellent values of gloss (20°) and haze in the tested formulation. The haze value of both carbon black pigments is at a very low level and shows the very good compatibility of COLOUR BLACK FW 200 and XPB 255 with the binders of our testing formulation. Gloss (20°) and haze were measured on a glass plate with haze-gloss-meter (haze-gloss, AG-4601) from BYK Gardner.

Jetness and undertone

The jetness MY and undertone dM of COLOUR BLACK FW 200 and XPB 255 on dried film were measured. These tests clearly showed the outstanding performance of XPB 255 in terms of jetness MY. XPB 255 has a jetness MY = 311. The high MY-values indicate a good dispersion level and a good stability of the carbon black pigment in this system again. Secondly a strong bluish undertone was observed, COLOUR BLACK FW 200 and XPB 255 showed values of dM > 12, which enhanced the impression of deep black color. Due to the positive influence of XPB 255 on the viscosity – not only in high solid systems – even a higher MY-value and dM-value can be achieved by increasing the carbon black pigment content.

Figure 3

MY

XPB 255

dM

M Y dM

COLOUR BLACK FW 200280

290

300

310

320

11

13

12

14

Jetness MY and undertone dM of COLOUR BLACK FW 200 and XPB 255

Figure 2

Glo

ss (2

0°)

XPB 255

Haz

e

gloss (20°) haze

COLOUR BLACK FW 20090

91

92

93

94

95

96

0

5

10

15

Comparison of gloss (20°) and haze of COLOUR BLACK FW 200and XPB 255

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Summary

Our evaluation clearly demonstrates the advantages of XPB 255. Highest jetness values MY can be achieved combined with a very strong bluish undertone dM. The biggest advantage of XPB 255 is the influence on the viscosity behavior. By using XPB 255 in a solvent-borne 2K-high-solid coating the storage stability can be improved without any additional ingredients. The risk for sedimentation is reduced. Stirring the coating after storage, a huge decrease of viscosity can be noticed and only a slight build up of viscosity was observed after reducing the shear force. Further benefit is the possibility of higher pigment loading in the mill base formulation, which reduces time, costs and waste material in the coatings production.

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OEC-3168 3/2014

The Americas

Orion Engineered Carbons LLC4501 Magnolia Cove DriveSuite 106Kingwood, TX 77345 USA

phone +1 832-445-3300fax +1 832-445-0250

[email protected] [email protected]

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Orion Engineered Carbons GmbHHahnstrasse 4960528 Frankfurt am MainGermany

phone +49 69 365054 100fax +49 69 365054 784

www.orioncarbons.com

[email protected]

Asia / Pacific

Orion Engineered Carbons Trading(Shanghai) Co., Ltd.Room 3701-3702,BM InterContinental Business Center100 Yutong Road, Shanghai 200070P. R. Chinaphone +86-21-61070966fax +86-21-6107-0967

All information and statements contained herein are believed to be accurate, but Orion Engineered Carbons LLC, its agents and/or af f iliates make no warranty withrespect 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 suchinformation 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.

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