The Chemistry of Paint

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The Chemistry of Paint-Chemicals in paint industry

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Functions of Paints

  • Enhance the quality of natural and synthetic materials and serves as a barrier against harsh environmental conditions
  • Decorative paints:  Improve the appearance and safeguard builings and other objects
  • Industrial coatings: Applied in factories to finish manufactured goods such as cars

 

Components of Paints

  • Pigments: Provides colour and opacity

o   Titianium oxide: Used widely as an inorganic pigment to provide “luster” to the paint

o   Calcium carbonate: A form of inorganic pigment that is mixed with titanium dioxide to produce “matt” paint

o   Zinc Phosphate: Prevent corrosion of paints

  • Binder/Resin: Aids to keep the pigment in place

o   Acrylic polymers: Manufactured by passing a mixture of ethanoic acid vapour, ethene and oxygen over heated palladium(ll) and copper(ll) chlorides

o   Alkyd polymers: Manufactured by reacting a polyol such as propane-1,2,3-triol (glycerol) with a dibasic acid such as benzene-1,2-dicarboxylic (phthalic) anhydride and a drying oil (linseed or soybean oil)

o   Epoxy polymers: Manufactured by mixing 1-chloro-2,3-epoxypropane (produced from 3-chloropropene) and substituted phenols, such as bisphenol A

  • Extender: Pigments that are bigger in size which helps to improve improve bonding
  • Solvent/Thinner: To reduce the thickness of paints for a wide variety of uses
  • Additives: Change the properties of paints in order to suit different needs

o   Dispersants: Isolate and preserve pigment particles

o   Silicones: Enhance the ability to external conditions

o   Thixotropic Agents: Allows consistency in the quality of paint

o   Driers: Shorten the time for paint to dry

Many of these components can be bought from paint chemical traders and distributors such as Tradeasia International Pte Ltd. Tradeasia holds a very strong portfolio for paint chemicals. They are one the trusted titanium oxide supplier and calcium carbonate trader.

What makes a Good Paint?

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  • Ability to be used in a variety of applications
  • Good opacity
  • Paint dries very quickly
  • Protection against water and heat
  • Good colour stability against visible and ultraviolet rays

Future of Paints

  • Water-based gloss paints: Intensive R&D work has been put into develop water-based gloss paints that is greener and higher quality
  • High solids paints: Figuring how to improve the structure of the polymer used in paint with the objective to produce one that is of low viscosity and good furnishing
  • Powder coatings: It is commonly used in the form of sprays on objects like bicycles. However, powder coating is usually used at high temperature and thus more work is required to produce one that works at low temperature.

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You may like to browse through our product catalogue to find out more about pgments, binders and additives.

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