CHAPTER 1- INTRODUCTION
Ball Mill plays an important role in paint industry. The manufacture of pigmented paint involves the dispersion of the pigments into binder and solvent components. This is an important part in the manufacturing process of paints. For this purpose grinding devices like ball mill, bead mill, sand grinder, roll mill or high-speed grinders are used. Though compared to ball mill the other devices provide better dispersion, they require constant attention, semi-skilled labor, high power requirements and have low rate of production, making the ball mill an important and significant part of paint industry.
This report comprises of basic information related to paints, principles of grinding, the use of ball mill in paint industry, factors governing the efficiency of mill and various technological aspects regarding the use of ball mill in paint industry.
CHAPTER 2- PAINT
It is a coating consisting mainly of resin, a solvent, additives, and pigments. It made its earliest appearance about 30,000 years ago. Cave dwellers used crude paints to leave behind the graphic representations of their lives that even today decorate the walls of their ancient rock dwellings .
2.2 Components of paint
Paint comprises of various components. They are as follows: -
Pigments- Pigments are finely ground particles or powders that are dispersed in paints. They impart qualities such as color and opacity and influence properties such as gloss, film flow, and protective abilities. They can be categorized into two main types: - 1. Prime or hiding pigments- They provide whiteness and color. They are also a source of hiding capacity. Eg- TiO2. They also protect the substrate from the harmful effects of ultraviolet light. 2. Inert or extender pigments-Extender pigments or extenders provide bulk at relatively low cost. They impact many properties like sheen, scrub resistance, exterior color retention .
Binder- It is the actual film forming component of the paint. It imparts adhesion, binds the pigments together, and strongly influences properties such as gloss, exterior durability, flexibility, and toughness. Binders include synthetic or natural resins such as acrylics, polyurethanes, polyesters, melamine resins, epoxy or oils .
Solvent & Vehicle- Solvent is used to adjust the viscosity of the paint. Vehicle acts as a carrier for paint application. Usually solvent and vehile are same. The vehile or the solvent is volatile and does not become part of the paint film. It can also control flow and application properties. Its main function is as the carrier for the non volatile components. Eg- water, alcohols, ketones, esters, glycols and ethers .
Additives- They impart specific properties like pigment stability, anti-freeze properties and foam control .
Misc.- Fillers are used to thicken the film, support its structure and simply increase the volume of the paint. Eg-talc, lime. Catalysts, Thickeners, Stabilizers, Emulsifiers, Texturizers, Adhesion promoters, Flatteners (de-glossing agents) are also added .
2.3 Important characteristics of paint
The important characteristics of paint are as follows  :- 1. Hiding or covering power
2. Required color
3. Required sheen or gloss
4. Weather resistance
5. Dirt resistance
6. Blister resistance
7. Resistance to peeling
8. Anti-corrosive properties
9. Proper consistency or viscosity
11. Low cost
2.4 Paint Applications
The main purpose of use of paints is to protect products from environmental corrosion and to improve their consumer appeal. The various applications of paint are :- 1. Paints are used as protective coating for equipments and structures in industries. 2. Paints are used as marine coatings, mainly as coatings to protect new and existing commercial ships or offshore oil and gas rigs and equipments. 3. Paints are used for highway or traffic...
References: 7. Biblac V.C., Edgar W.S.: “PAINTS & WARNISH PRODUCTION MANUAL”, 1991, John Wiley and Sons, NY, pp 40-46, 132-137, 996-1004.
9. Handbook of grinding by Paul O Abbe, A division of Aaoron Engineered Process Equipment, Inc., 1994
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