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…….??????

WISH you…. Have a

COLOURFULL LIFECOLOURFULL LIFE

with HAPPINESS…