Raw Materials
The main raw materials used in the production process are pigments, solvents, resins, vegetable oils, varnishes, alkyds and polyvinyl acetate (PVA) emulsions.
For both large and small plants the main steps in paint manufacture are as follows.
I. Mixing and dispersion.
Pigments are usually added to the vehicle by blending the ingredients in a paste mixer. The paste that is formed consists of poorly mixed aggregates of pigment and vehicle; this paste is brought to a specified fineness and uniformity by using an appropriate mill. "Grinding" or shearing wets the individual pigment particles with the liquid vehicle and further reduces the size of the pigment aggregates. For emulsion paints, such as
Pigments are usually added to the vehicle by blending the ingredients in a paste mixer. The paste that is formed consists of poorly mixed aggregates of pigment and vehicle; this paste is brought to a specified fineness and uniformity by using an appropriate mill. "Grinding" or shearing wets the individual pigment particles with the liquid vehicle and further reduces the size of the pigment aggregates. For emulsion paints, such as
