WELLCOME WELLCOME
WELLCOME
WELLCOME
MYSELFSHOSHI PRASAD SHIL
Id. 20121207020Dept. of APPLIED CHEMISTRY and CHEMICAL ENGINEERING
BSMRSTU.
OBJECTIVES
Coating consisting of – Pigments – a film former (binder) – a suspending medium or solvent
PAINT
Pigments consist of small particles of colored compounds.
Are derived from finely ground naturally occurring minerals: rocks and ores.
These not only give the paint its colour and finish, but also serve to protect the surface underneath from corrosion and weathering as well as helping to hold the paint together.
Egyptian Blue
It is one of the oldest man-made colors. Commonly found on wall paintings in
Egypt, Mesopotamia and Rome. Calcium copper silicate
Azurite was Used for Jewelry
Ultramarine Ultramarine, from
"across the sea", is the pigment from ground lapis lazuli, a semiprecious stone.
Lapis Lazuli
Beautiful jewelry is made from lapis lazuli.
Malachite
Malachite is also used for jewelry and pigment.
Gemstone Makeup Egyptian women put
ground malachite mixed with water on their eyelids (as well as soot around their eyes).
Cinnabar
Cinnabar is mercury sulfide and dangerous to inhale.
It was used for pigment and jewelry.
Vermilion Cinnabar Pigment
Cinnabar pigment applied to sculpture and to paper.
Burnt Sienna
Iron Oxidein clay
Reddish Brown
Lead White
Lead oxide Very opaque white
Lead White
Roman women used ground lead powder to make their faces look white.
Roman women wore a face cream made from tin oxide.
Chinese White
Zinc oxide is derived from smoke fumes. It has very fine particles. It was first introduced in 1840.
Vine Black
Carbon black
Iron or Prussian Blue The iron blues are the first of
the artificial pigments with a known history and an established date of first preparation.
The color was made by the Berlin colormaker in or around 1704.
Egg Tempera
Until the 15th century, egg yolk was used as the most common binder and medium for paints.
Egg tempera is prepared by mixing egg yolks with a slurry of artist's pigment in water.
Enough water is added to provide the proper consistency for painting.
“BINDS” the pigment and provides adhesion,integrity and toughness to the dry paint film.
serves to suspend the pigments and bind them to the surface of the object painted.
Examples are: beeswax, linseed oil, walnut oil, plaster, gum arabic and egg yolk.
Examples of BINDER Paint technology advanced very little
until this century. Even as recently as the 1960s 'drying oils' were the commonest paint binders.
Linseed oil, the most common example of a drying oil, will dry in 2 to 3 days while other oils, such as soya bean oil, may take up to 10 days.
PVCPVC Pigment volume (not weight) concentration
It use to determined the quality of paint
Functions of pigment and binder in paint
FILM FORMATION of latex paint occurswhen the paint is applied and the waterevaporates. During this process, the particles of pigment and binder come closer together.
As liquid evaporate, capillaryaction draws the binder particles togetherwith great force, causing them to fuse andbind the pigment into a continuous film.
Functions of pigmentFunctions of pigment The pigments are used in paint
formulation to carry out one or more of the following tasks:
i. to provide color, ii. to hide substrates and obliterate previous colors , iii. to improve the strength of the paint film, iv. to improve the adhesion of the paint film, v. to reduce gloss, vi. to reduce cost
Functions of pigments1. To protect the film by reflecting the destructive uv
ray2. To Provides surface protection and decoration. 3. They are non toxic and most of all chemically inert.4. to make paint hard and sensitive.5. To make surface attractive by providing unique
color.
FUCTIONS OF BINDER The binder is a very important
ingredient that affects almost all properties of the coating, especially the following…
adhesion and related properties like resistance to blistering, cracking and peeling
other key resistance properties like resistance to scrubbing, chalking and fading
application properties like flow, leveling and film build, and gloss development
FUNCTIONS OF PVC The pvc largely controls such factors as-
Gloss Reflectance Rheological properties Wash ability Durability
It also serves as the guide for reformulation work, using different pigment or vehicle combination and such is extremely useful to the pant formation.
Any Questions…….??????
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