Civil Engineering Reference
In-Depth Information
paint is very economical. When painting render and concrete flaking will occur,
if not with the first treatment, then with a later one. This is because of tensions
within the glue. Painting wet-on-wet avoids stains.
Emulsion paints are exclusively based on renewable raw materials and are
soluble in water. Production causes no problems and application of the paint
causes no health risks. Within buildings they do not create indoor climate
problems. They are washable and hygienic and do not cause electrostatic
charging.
The paints are relatively strong and difficult to remove to enable the re-use and
recycling of painted components. Painted products can be energy recycled in
normal incinerators and even composted. The addition of environmentally dam-
aging pigments causes problems which could reduce the otherwise good envi-
ronmental profile.
Recipes for emulsion paint
In all the paints described below, the pigment is mixed with linseed oil. The paints should
be applied directly after preparation.
Recipe 1: Animal glue/linseed oil paint
This paint is fairly strong, and can be used outside and inside, but is best used indoors.
Protein glue is mixed in the same way and portion as in glue paint recipe, p. 419, and 2.5
litres of boiled linseed oil are added.
Recipe 2: Flour paste-linseed oil/casein paint
For interior and exterior wood and masonry: 10 parts flour are mixed with 10 parts cold
water, then 50 parts boiling water, to form the glue. Linseed oil in 10-12 parts and 10 parts
skimmed milk are added, with colour pigment to a proportion of 15-40 per cent volume.
Recipe 3: Casein/linseed oil paint (casein oil tempera)
For interior and exterior wood: 10 parts sour milk is mixed with four parts linseed oil and
about four parts pigment. The paint has been said to last from five to 10 years exter-
nally.
Recipe 4: Egg/linseed oil paint (egg oil tempera)
For internal use on wood. It gives a hard shiny and easily cleanable surface. One part lin-
seed oil is mixed with one part fresh egg and one part water, pigments to a proportion of
15-40 per cent.
Stain
Stains are used on wood and do not contain added binders. There are two main
types of stain: chemical stain and water-based stain.
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