Paints and Pigments - Oil and Emulsion Paint

Clear information on the differences between oil and emulsion paint and how they dry. This includes simple diagrams and labels to help everyone understand how paint dries.

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  • Created by: Lucy3301
  • Created on: 03-02-16 16:50
Preview of Paints and Pigments - Oil and Emulsion Paint

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CHEMISTRY
Paints and Pigments
Properties of Paint
Quick drying
Stick to the wall
Nice colour
Easy to spread
Low smell
Low toxicity
Pigment Gives paint its colour.
Binding Medium Sticks the pigment in the paint to the surface.
Solvent Thins the paint making it easier to spread.
Colloid A mixture of tiny particles of one thing in another.
Why do we use paints?
1. To look attractive ­ the pigment gives the colour.
2. For protection ­ outside woodwork is painted, to protect the wood against the rain. The oil
sticks to the wood and forms a skin.
Oil Paint
The solvent evaporates.
The binding medium dries, forming a skin.
The skin sticks the pigment to the surface.
Emulsion Paint
The water evaporates.
The droplets of oil join together to make a continuous film.
The skin sticks the pigment to the surface.
Emulsion paint is a colloid because it has oil droplets in water. Each oil
droplet has solid particles in it. The solid does not separate because
they are very small.
C1
Year 10

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