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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
2
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
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.
OEC-3168 3/2014
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