REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Effect of IF-WS₂ nanoparticles addition on physical-mechanical and rheological properties and on chemical resistance of polyurethane paint

DRAGANA S. LAZIĆ

Military Technical Institute, Belgrade, lazicdragana85@gmail.com

Danica M. Simić

Military Technical Institute, Belgrade, simic_danica@yahoo.com

ALEKSANDRA D. SAMOLOV

Military Technical Institute, Belgrade, aleksandrasamolov@gmail.com

Abstract:  In this paper a possibility of improving properties of protective coatings by adding nanoparticles of IF-WS₂ is examined. Nanoparticles were added to a standard polyurethane paint for military camouflage protection, in a concentration of 1 wt.%, and dispersed in paint by ultrasonic irradiation. After the homogenization on the magnetic stirrer the paints were applied to standard steel plates, and dried, for examinations of physical-mechanical properties and on chemical resistance. The following physical-mechanical properties were compared for paint without and with IF-WS₂ nanoparticles: hardness, flexibility, elasticity, abrasion resistance and stickness. Camouflage properties were also examined - IR reflection and colorimetry. Also, resistances to salt water and agressive media were observed. The effect of adding IF-WS₂ on rheological properties of the two examined paints has been examined using Dynamic Mechanical Analysis (DMA), observing viscosity as the function of the shear rate.

Keywords: polymeric coating, polyurethane paint, tungsten disulfide, nanoparticles.