Could you give us some fundamental guidelines on the formulation of fungicidal coatings systems which can be used in plants and buildings in the food industry ?
Coating systems for this type of application must produce films that are resistant to damp, organic acids and detergents and must show good adhesion to mineral surfaces. They must, of course, contain effective biocides to combat bacterial attack, mould formation and similiar symptoms.
Various kinds of binders can be used, such as cyclised rubber with added alkyd resin which acts as a plasticiser ( e.g. 16 parts Alpex CK 450, 12 parts aluminium alftalate, 33 parts white spirit and about 30 parts of pigment ). One could also use a composition based on vinyl chloride - vinyl acetate copolymer, formulated with chlorinated paraffins, butyl and ethylacetate as well as MEK.
A polyurethane coating compound could also be effective. As far as biocides are concerned, one will wish to avoid heavy metal compounds because of their toxicity and likely effect on the environment. Suitable alternatives include tetrachloroisophthalonitrile, 1,2-benzisothiazolin-3 and one of the disthiocarbamates