C1h: Paints and Pigments

Pigments and paints play an important part in our modern lives. Our clothes, houses and our local environment are all made much more interesting and pleasing to the eye by the use of colour. 

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Name three ingredients in paint
Solvent, binding medium and pigment.
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What is the function of solvent in paint?
Thins the paint and makes it easier to spread.
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What is the function of binding medium in paint?
Sticks the pigment in the paint to the surface
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What is the function of pigment in paint?
The substance that gives the paint its colour
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What is dispersed in an oil?
The pigment
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What often dissolves in an oil?
A solvent
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Why is paint used?
to decorate surfaces or protect them from damage.
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What are thermochromic pigments sensitive to? Explain
They are sensitive to temperature. They change colour when they are heated up or cooled down.
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Give two uses of thermochromic pigments.
useful for indicating if the drink in a cup is hot, baby toys&spoons as a safety feature, mood rings, or if the water in a kettle is hot.
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What can phosphorescent pigments do?
Glow in the dark
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Give an example of a colloid?
A paint.
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What is a colloid?
Where the particles are mixed and dispersed with particles of a liquid but are not dissolved.
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Why won't the components of a colloid separate?
The components do not separate out because their particles are small enough not to settle at the bottom.
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How do most paints dry?
Paints are applied as a thin layer then the solvent evaporates.
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What are emulsion paints?
They are water-based
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How do emulsion paints dry?
Their solvent is water and they dry when the water evaporates.
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How do oil paints dry?
The pigments in oil paints are dispersed in oil,which may be dissolved in a solvent,which evaporates away when the paint dries.This leaves the pigment&oil behind.The oil oxidises to form a hard film.This happens cuz the oil reacts with oxygen in air
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What are phosphorescent pigments useful for?(2)
watching faces that glow in the dark. They may also be used in fire safety signs placed near fire extinguishers. In the event of a fire, the location of the fire extinguishers can be seen even if the lights fail.
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Why do phosphorescent pigments glow in the dark?
They are able to absorb light energy and store it. This stored energy is released as light energy over a period of time.
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What used to be used for glow-in-the-dark watch faces? Which is safer?
Radioactive paints. Phosphorescent pigments are safer because they're not radioactive.
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Other cards in this set

Card 2

Front

What is the function of solvent in paint?

Back

Thins the paint and makes it easier to spread.

Card 3

Front

What is the function of binding medium in paint?

Back

Preview of the front of card 3

Card 4

Front

What is the function of pigment in paint?

Back

Preview of the front of card 4

Card 5

Front

What is dispersed in an oil?

Back

Preview of the front of card 5
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