Highly efficient dispersion of conductive carbon black.

With the development of the trend of automotive lightweighting, the proportion of plastic parts used in vehicles will continue to increase.
Plastic parts in the vehicle application ratio continues to improve the
for automotive parts in the large bumper, to avoid the construction of coating process may produce color in unearemly, spot spots, stains, static electricity and other issues. The choice of automatic electrostitive spraying is to help stabilize the quality of coating, improve the production capacity of better choice, and in the paint consumption and labor costs also have a significant reduction in the cost of

.
automatic electrostectrical spraying
such as the use of automatic electrostectrical spraying process, primers must be conductive primers, paint to achieve electrostectrical spraying. Carbon-conducting materials such as conductive carbon black and graphite powder have low density, corrosion resistance and stable conductivity.
Although carbon black itself is a semiconductor material, can be called conductive carbon black needs to provide a lower resistivity of the coating, in order to add a small amount in the formula can efficiently achieve the desired conductivity.
conductive carbon black often has the following characteristics:
particles fine. There are many particles in the unit volume, which reduces the space after dispersion and increases the conductivity.
high-chain structure for high electrical conductivity. The branch chain structure may be damaged by grinding.
a pure surface. Surface oxides can act as a table activity, but they can affect electrical conductivity.
is porous and rough. It will be highly conductive, but difficult to wet than the area.
is not difficult to find, can significantly improve the conductive efficiency of carbon black are wetting, grinding, dispersion, stability is not conducive. Therefore, some efficient options are needed for wetting dispersants to help grind out shallower conductive primers. At the same time, as a primer will also be with inorder fillers, titanium white and so on as a co-grinding formula, so it is difficult to get efficient grinding and stable storage. Problems such as poor color display, deep bottom back thick, floating hair flowers and so on occur from time to time.
solve the problem of conductive power, but in the use of a new challenge! Is conductive carbon black really that high?
see how Created TEGO ® Dispers 673 can smooth out this difficulty!
efficient dispersion of conductive carbon black
we compare the performance of formulas that do not add any dispersants (blank), add market-used dispersants, and TEGO® Dispers 673 after grinding.
basic formula (carbon black SOP: 70%)
viscosity performance after grinding
storage stability performance
after 50 oC 2 weeks to observe storage stability: samples with TEGO® Dispers 673 were found to have no subsidy and whitening.
resistance to aging, corrosion resistance
in the resistance to aging, corrosion resistance will not add more negative effects: the figure above is a comparison of 1500 hours of salt spray experiments.
TEGO® Dispers 673 Applications at a Glance
For
hard-to-disperse organic pigments and carbon black
direct grinding system formulations or slurry concentrates
automotive bumpers, interior and exterior plastic parts, general industrial paint, patch paint, etc.
The two-part polyurethane, two-group epoxy, single-group polyamide
application advantages
enable carbon black grinding with high blackness
excellent color slurry stability
weather resistance and good QUV resistance
improve paint storage stability
.