Course

Unit 1 Introduction to Paints and Paint TechnologyGeneral introduction to paint industry – definition of paints, varnishes and lacquers their constitution and functions, general classification of surface coatings – decorative and protective coatings – paint industries in India.Unit 2 Pigments Dyes and ExtendersDefinition and classification of pigments and dyes – properties and evaluation of pigments such as crystal structure particle size and shape, refractive index and hiding power, oil absorption, colour, specific gravity and bulking value, UV and IR absorption, light fastness, resistance to heat water, alkali and acid, corrosion inhibition, toxicity, reducing power, tinting strength, flooding and floating, settling, volatile and water soluble matter, residue on sieve, bleeding – white pigments and coloured pigments – organic and inorganic pigments – industrial manufacture of pigments – special effect pigments – Extenders – use and functions of extenders – examples for extenders.Unit 3 Binding Media, Solvents and Additives in PaintsFundamentals of film formers, chemical structure of monomers, functionality and its determination, degree of polymerization and molecular weight, non-convertible and convertible film formers, linear, branched and cross linked film formers, homopolymers and copolymers – manufacture, chemistry and applications of alkyd resins, polyester resins, phenolic resins, amino resins, epoxy resins, polyamide resins, polyurethanes, silicone resins, vinyl and acrylic resins – emulsions – polystyrene and styrene-acrylic emulsions. Solvents, dryers, surfactants and other additives in paints.Unit 4 Paint Formulation, Manufacture and Application TechniquesPrinciples of paint formulation, formulation elements, mathematics & steps: PVC, CM, P/B ratio, sp gravity, etc; typical formulations of primers, undercoats and finish coats – steps in paint manufacturing, phenomenon of wetting, grinding and dispersion, important considerations in pigment dispersion and rheology – different milling and mixing techniques – factors affecting effectiveness of milling such as size, speed and type of mill; volume, composition, size and shape of grinding medium – mill base. Surface preparation techniques – physical and chemical surface treatment techniques – common application techniques – packaging technology.Unit 5 Colour Technology, Paint Properties and Quality Control in Paint IndustriesColour science and technology – light spectrum, primary and complementary colours, colour mixing, dimensions of colour and colour systems, colour measurements, computer colour matching – colour coding system – general properties of paints, classification of paint properties – adhesion and cohesion properties, factors affecting adhesion wetting power, optical properties; colour, gloss, hiding, etc., physical, chemical and mechanical properties of paint films – factors affecting coating properties – rheological properties – Newtonian and non-Newtonian liquids, thixotropy, factors affecting viscosity, objectives of paint testing – quality control procedures, standard specifications and test methods – tests on liquid paints density, dispersion, viscosity and consistency, wet opacity and dry hiding, spreading capacity and spreading rim, wet and dry rim thickness, drying time, etc. – tests of dried coatings, colour and colour fastness, light fastness, gloss, flexibility, adhesion impact test, hardness mar resistance, abrasion resistance water and moisture resistance; water vapour transmission, PAC and salt spray test resistance, resistance to chemicals and solvents, resistance to heat and fire, air permeability – evaluation of water based paints, biological effects on paint films. Analysis of paints and varnishes; volatile and nonvolatile matter pigment content, binder or solid vehicle content, water content, ash content, pigment binder and solvent analysis – ageing properties of coatings, weatherometery, natural outdoor durability test, accelerated outdoor weathering, artificial weathering tests, defects observed in paint film on exposure.

TEXTBOOKS1.Australian OCCA, Surface Coating Technology Volume 1, Chapman and Hall, 1974.2.W. M. Morgan, Outline of Paint Technology, John Wiley Sons, 1990.REFERENCES1.L. S. Pratt, Physics & Chemistry of Organic Pigments, Wiley, 1947.2.H.Y. Payne, Organic Coating Technology Vol, 1 & 11, John Wiley & Sons, 1954.