Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 37

PAINT AND COATINGS MANUFACTURING: WATERBORNE PIGMENTS
disperse, and to keep in a stable dispersion. Now, there are
two parts to make a stable coloured paint: the first is to make
quality pigment concentrates. The second is to properly
incorporate those pigment concentrates in the finished
product. It is the task of the paint formulator to do the right
choices of surfactants, dispersants, rheology modifiers and
other ingredients to make sure the pigments will be properly
dispersed and stabilized in the final paint to avoid problems
like pigment flocculation, colour flotation, pigment settling,
colour rub up and others in the applied film.
Diane Langer (DL): With the appropriate application,
priming, and raw material selection, our customers require
more than one technology to apply the same colour to any
substrate for the exterior of the vehicle, and have it match.
With the emphasis on light-weighting, automakers are using
more alternative substrates such as engineered plastics, and
today's advancement in pre-treatment from BASF allows the
use of the same paint.
What pigments are best suited for water dispersion?
EM: In many cases, the pigments used in water dispersions
are the same as those used in solvent-based dispersions. In
other cases, pigment manufacturers give a special surface
treatment to certain pigments to facilitate their dispersion
in aqueous media. On the other hand, the paint formulator
must know the nature of the pigment surface-hydrophilic
vs. hydrophobic, acidic vs. basic-in order to choose the most
suitable surfactants and dispersants. The particle size of
the pigments and their surface area are other key factors to
take into account when determining the type and amount of
surfactants and dispersants to use to efficiently disperse a
specific pigment or to maintain the shelf stability of a wide
variety of pigment combinations.
Have there been any innovations in agitation or mixing
solutions that extend the period of suspension?
DL: From new dispersants to dispersant-free solutions, there
are new innovations on the market. As colour becomes more
complex-going from lighter in the flash to darker in the flop-
finer and tighter particle dispersions are necessary to enable
these colour design demands.
EM: Innovations in the field of grinding equipment have been
key to making the pigment dispersion process more efficient,
especially for organic pigments such as quinacridone-type
magentas and violets, phthalocyanine blues and greens,
organic reds, and other pigments considered difficult to grind
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May/June 2023
8/28/2014 4:20:56 PM
37

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Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023

Table of Contents for the Digital Edition of Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023

Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 1
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 2
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 3
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 4
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 5
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 6
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 7
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 8
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 9
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 10
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 11
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 12
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 13
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 14
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 15
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 16
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 17
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 18
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 19
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 20
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 21
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 22
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 23
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 24
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 25
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 26
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 27
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 28
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 29
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 30
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 31
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 32
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 33
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 34
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 35
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 36
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 37
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 38
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 39
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 40
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 41
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 42
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 43
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 44
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 45
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 46
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 47
Canadian Finishing & Coatings Manufacturing Magazine - May/June 2023 - 48
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