Engineering Chemistry S Datta

PAINTS 473
Table 21.2: General formulations of paint are shown in the table
Constituents Class Types and Functions Example
Vehicle (i) Nonvolatile
solvent based.
Pigments
Extenders
or Inerts
(ii) Volatile i.e.,
low boiling
solvent based
(thinners)
Inorganic
or Organic
Oils and/or Resins (Film forming
materials protect the surface
from weathering), Driers (accelerate
the drying of film)
Additives in case of emulsion
paints are antibacterial, stabilising
surfactants and pH adjusters
Ketones
Esters
Aliphatics
Aromatics
(i) Opaque
(ii) Transparent
(iii) Special purpose
Diatomaceous earth etc.
Linseed oil, Tung oil,
Dehydrated castor oil,
Fish oils, casein, Acrylics.
Co, Mn, Zn, Pb, naphthenates.
Methyl ethyl ketone
(MEK).
Ethyl acetate, Amyl
acetate, Butyl acetate.
Naphtha and other
petroleum fractions.
Xylol, methylated naphthalene
White lead, white ZnO,
TiO 2
.
Lithopone, chromegreen,
zinc yellow.
White extender pigments
BaCO 3
. BaSO 4
.
China clay, talc, mica, etc.
Manufacturing of paints
The manufacture of paints involves only (i) mixing of the ingredients (ii) proper grinding
and lastly (iii) packing.
Tints and
Thinners
Resins
Feed Tank
Mixer
Tinting &
Thinning tank
Labelling
machine
Filling
machine
Oils
Belt conveyer
Weight
Pigments
Tank
Grinding mill
Hopper
Carton
Packaging
Shipping
Platform scale
Fig. 21.1 A flow diagram of mixing of a paint.