COATINGS - Industrial Chemistry

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COATIN

GS

Fleurdeliz N. Plato

ChE - 4202


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COATINGSCoating is a covering that isapplied to the surface of an

object.

It increases the attractiveness

of the manufactured goods, aswell as the aesthetic appeal of

a community of homes and

their interior.


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Two

classificationsof coatings


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1. Architectural

CoatingsCoatings that are used tocover buildings, furniture,

wood, gypsum, wallboard, orplaster surfaces.


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VARNISHESA varnish is an unpigmented

colloidal dispersion or solutionof synthetic and/or natural

surfaces.


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OLEORESINOUS

VARNISHESA varnish made through a

solution of one or more naturalor synthetic resins in a drying oil

and a volatile solvent.


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WATER-THINNEDVARNISHES

It was developed due to the

pressure to reduce the amount ofair-polluting solvents invarnishes and paints.


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TWO

MINOR CLASSESOF VARNISHES


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1. Spirit Varnishes

Solutions of resins in volatile

solvents only, such as methanol,

alcohol, hydrocarbons, & ketones.

Example: Shellac


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ShellacA resinous material secreted by an

insect Kerria lacca, which is native toIndia.


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2. Japans

Japans are opaquevarnishes to which asphalt

has been added for color andluster.


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RESINS


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RESINS

It is a hydrocarbon secretion ofmany plants, particularly coniferous

trees.


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FOUR CATEGORIES

Rosins, which are resinous

products obtained from the pitch

of pine trees. Rosins are used invarnishes, adhesives, and various

compounds.

Oleoresins, which are natural

resins containing essential oils of

plants.


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Fossil resins, which are naturalresins from ancient trees thathave been chemically altered by

long exposure. Examples of fossilresins include amber and copal.

Gum resins, which are natural

mixtures of true gums and resinsincluding natural rubber, gutta

percha, gamboge, myrrh, and


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Industrial

Coatings


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Alkyd resins widely compatible with oilsand other resins and are used in paints andmoulds for casting.

Phenolics used to resist alcohols and foodacids, particularly in cans and containers.

Acrylics used in automotive topcoats andrepresent the current optimum combinationof price, durability, flexibility, andappearance.

Epoxies used on appliances, as linings,and for prime coats.

Urethanes strongly adherent to metal and

resist both chemical attack and abrasion.


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LACQUERS


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COATINGS - Industrial Chemistry