INCLUDE PIGMENT PAINT AND VARNISH

The paint and varnish industry is essentially a compound industry
And hence the coverage given here
Will be fairly brief.

The manufacturing of paints, varnishs, lacquers, and enamel, involved a few unit operations and no unit processes. Of course, the manufacturing of ingredients such as pigment and resins involved chemical reactions and therefore unit process. Synthetic resins are considered later in the text and only an titanium dioxide pigment will be considered in this chapter.

Although the chemical engineer's involvement in paint manufacturing process is not as extensive as in some other industries, the use of protective coatings for equipment and structures as of obvious importance to the chemical engineer.

The formation of protective coatings by paints varnish lacquers  and enamels involved the production of films of the order of one mil 1/1000 inch thick of surface. In general, the requirements for such surface coatings include the following.

1. Hiding power or covering power

2. color

3. Weather resistance

4. Washability

5. Glass

6. Anticorrosive properties

7. Consistency suited to application(by brushing dipping, spraying or roller coating)

8. Non-toxicity

9. Low cost