Influence of Nano Alpha Aluminum Oxide (Α -Al2o3) on Thermal Properties of Nano Insulation Coating.

Abstract

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 (α-Al 2 O 3 ) 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.Copy Right, IJAR, 2016,. All rights reserved.