Can you suggest a protective paint for application to equipment used for producong fertilisers ?
Protective coatings for plants used to make fertilisers based on ammonium sulphate and nitrogen-based compounds generally (lactams) should exhibit resistance to organic as well as inorganic subtances in equal measure. Although, at first glance, this might appear to be rather too exacting a requirement which might, perhaps, restrict the choice of suitable product, there are, in fact, quite a number of such product on the market.
One of the most important factors is the type of binder used. The most widely used are epoxy resins and especially for linings, epoxy-tar compositions. Good result have also been obtained with vinyl resin based paints for which there is a wide range of formulations. Polyurethanes have also become popular in recent years, especially where coatings have to withstand severe mechanical stresses.
Pigments should also be sufficiently resistant to the conditions likely to be encounteres. Although the choice is not as wide, colour is not so important in this case. The most suitable pigments are those based on iron oxide as well as titanium dioxide. Fillers which help to protect against corrosion include talc and mica.