6. Coating Principles

6.2 Paints

Composition of Paints

There are basically four ingredients in paints.






The functions of the above ingredients are explained below.

Binders:  The function of a binder is to bind all the pigments together into a homogeneous film. The binder is basically a resin. The binder is also called 'vehicle'. Resins are non volatile. Examples include epoxy esters, chlorinated rubbers, acrylics, linylsy urethanes, etc.

Pigments:  Basically a pigment provides a decorative color and it protects the binders from the destructive effect of the sun rays on the binders. Examples: iron oxide (red), titanium dioxide (white), chrome yellow (yellow), lampblack (black).

Solvents:  The function of a solvent is to convert a solid binder into a homogeneous working fluid as many of the binders would be unworkable unless converted to liquid. Examples include aliphatic hydrocarbons, aromatic hydrocarbons, esters and alcohols.

Additives:  These are auxiliary products added to improve the technical properties of paints. Examples: