PAINTS.pptm - PAINTS A mixture of a pigment and a suitable...

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PAINTS: “A mixture of a pigment and a suitable liquid to form a closely adherent coating when spread on a surface in a thin layer” OR “A liquid substance used to decorate or to protect a surface is called Paint”
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HISTORY: Throughout the recorded history human have the desire to decorate their living space. The oldest known painting are approximately 40,000 years old. At that time people use to decorate their caves. As long age as 38,000 BC people used paint made from soot earth in animal fat to beautify the walls of their caves. After sometime people modified this evolutionary process.
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COMPOSITION: Paints are usually composed of : 1) Body or Bases: ) Forming the main body of a paint. ) Make the paint film harder and more resistant to abrasion. ) Reduce shrinkage and cracks on drying. Commonly used bases are Iron oxide, Zinc oxide and white lead etc.
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2) Pigment: These are materials which give the paint it color. In unmixed form pigment is simply a powder. Pigment are divided into categories: (i) Natural pigcentrements : These occur naturally such as in Rock etc. Also includes various clays,CaCo3 and Silica etc. (ii)Synthetic pigment : Which are Prepared in factories such as Phthalocynines.
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3) Vehicles: Oily liquid in which the body or bases and pigments are soluble. It make easy the paint to spread over the surface. The main purpose of the vehicles is to adjust the viscosity of the paint. It is volatile and doesn't become part of the paint film. It can also control the flow of paint.
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4) Thinner: The viscosity of paint is reduced by addition of solvent called Thinner Liquid. Increase fluidity. Making paint more smooth.
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