Thermal insulation coatings are a class which begins to attract more
focus and priority in recent researches because of their importance and their
numerous applications in different civil and industrial fields. In this
research, the effect of nano alpha aluminum oxide (?-Al2O3) on the thermal
insulation of polymer based paint was investigated. The different weight
fractions of nano aluminum oxide ( 2%, 3%,4% and 5% wt. of polymer weight) were
added to the formulation which contained nano titanium dioxide and nano calcium
carbonate and poly vinyl acetate polymer solution . Dip coating technique was
used to coat all samples. The highest increase in insulation value (R-value)
was recorded for 4 %wt. sample where its improvement percentage reached to
24.42% compared with the sample which was contained no nano aluminum oxide
addition while the other samples showed varied values. The microscopic images
showed that 4% sample has well dispersed than others. The Knudsen diffusion
effect is the proposed mechanism explaining the insulation improvement. - Seemore at:.
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