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The researchers again tested organic and organic - inorganic fluorinated hybrid coatings as protective materials for clay bricks
in current work, standardized types of finish clay bricks are treated with two types of hydrophobic coatings.
source: Hoda Bogdan - stock.adobe.com.
the durability of brickwork, used as finished bricks, guardrails or chimneys is an important aspect of building maintenance
s
.
absorption and penetration caused by wind and rain, water flow and capillary rise can lead to serious damage and premature deterioration of porous clay bricks, and significantly increased thermal conductivity.
protective coatings for brickwork must provide enhanced hydrophobic properties without compromising moisture regulation and breathability of masonry.
Treatment of clay bricks with two hydrophobic coatings
In the current work, standard type of finished clay bricks are treated with two types of hydrophobic coatings, the hydrophobic coating is based on commercial perfluoropolyther lysosomes containing the end group of alkyl silane, respectively, with or without inorganic premeditated tetrythyl silane to produce intestogeneous silica nanoparticles.
the performance of the coating is evaluated by a variety of indicators, such as wetting delay, absorbent coefficient, degree of protection of capillary action, contact angle, roughness and gloss, as a function of coating volume.
the uncertainty analysis of the indicator is carried out.
the coating performance at a different exposure time than the true exposure time in place.
the amount of water absorbed by the PFPE coating has
the optimal amount of coating is established to maximize protection with the least amount of polymer.
results, a square meter of brick surface exposed to water for 2-4 hours can absorb about 7-8 liters of water.
very small amount of PFPE coating changes the brick surface/water interaction, halves the absorbed water (0.5-2 liters) and increases the protection to 80-100%.
after a longer exposure time, when brick samples are treated with an organic/inorganic nanostructure mixed with a PFPE coating, the reduction in water absorption is essentially higher.
the study was published last year:
Journal of Coatings Technology and Research January 2019, Volume 16, Issue 1, pp 81-92
.
