... what kind of world would we live in if paint did not exist?
and prices can vary from around £500 per tonne to £2500 per tonne. A formula will use a specific titanium dioxide. One cannot jump to the conclusion that one paint is better than another solely because it has a higher percentage of titanium dioxide. This is a common way that some athletic paint manufacturers market their paints, the customer must consider the paint as a whole. Sometimes a smaller proportion of a high performance titanium dioxide will out perform a higher percentage of a cheaper titanium dioxide. The commonly used extenders are China clay, calcium carbonate and talc. Each of these raw materials has its own combination of strengths and weaknesses (whiteness, pH, etc.) and manufacturers make their choices based on their perceptions of these properties. The largest volume manufacturer of athletic field marking paints (Fleet Line Markers Ltd) recognises that calcium carbonate and China Clay are both quality
extenders and chooses the optimum extender or combination of extenders to maximise the performance of their paints. There is considerable variation in quality within each family of extenders and likewise the cost exhibits similar variation. Larger manufacturers can therefore pass the benefits of bulk purchasing power on to the consumer without compromising the quality of product.
The binder (resin) used in these
products is generally some type of acrylic emulsion which combines good performance with moderate cost. Some are more sensitive to damage as a result of freezing or exposure to heat and produce paints that are more sensitive to storage conditions. Almost all resins used today are derived from oil and are to some extent tied to the fluctuations in the price of oil.
It is worth briefly mentioning two of the additive types often found in these paints. The rheology of the paint is
adjusted by the use of thickeners. These come in a bewildering range of chemical types, some of which are more suitable than others. It is a commonly held misconception that thick (viscous) paint represents better value than thin paint. It is possible to artificially boost the viscosity of a paint with relatively low levels of pigmentation to give the impression of better value for money. Our prehistoric ancestors, with their early paints, began the journey of development that still continues today. As paint producers we are always seeking to improve performance, value for money, innovate and comply with the legislative framework of modern society. Paint might be a tedious topic to most people, but just ask yourself what kind of world would we live in if paint did not exist?
Article written by the Chief Chemist, Fleet Linemarkers
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