Description:-
Degradation of various substrates from fungal
attack and consequent loss pose a paramount challenge to coating
technologists to develop ideal anti fungal paints having the
following characteristics;
a) The painted
surface should not induce microbial attack under the environmental
conditions.
b) There should not be formation
of internal metabolites or enzymes leading to surface deterioration.
Generally, mildew or moulds, belonging to
the family of fungi, need a food source of organic matter
such as celluloses, starches, proteins, fats, compounds of
nitrogen, phosphorus and sulphur for their existence and development.
The other main requirements are for a good source of water
(which is often substantiated in the form of condensation
of very high humidity), pH, oxygen and a moderate temperature.
Given optimum conditions growth can be very fast. It is noteworthy
to mention that fungal growth is greatly restricted beyond
pH 8.5. The infection of a painted surface by moulds manifests
itself in two ways. The growth may consist of mycelium, which
consists of fine filaments ( mycelial type ) or coloured spots
with spongy structure ( nodular type ) or a combination of
both. Microscopic examination is necessary to distinguish
fungal growth from dirt collection.
Our ideal anti - fungus & anti –
bacterial paint possess the following properties, namely;
Toxic to fungi but not to humans.
Does not discolour,
either , either during storage in the can or in the dried
film.
Does not accelerate
corrosion and form amalgamates with the container.
Remains stable
and active for 2 to 3 years.
Has a moderate
concentration and does not posses any objectionable odor.
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