Effect of Magnesium Hydroxide on Flame Retardant Properties for Adhesive Materials by Solution Mixing Process

Abstract The objective of this research was to investigate the effect of magnesium hydroxide on the flame retardant properties of adhesive materials. The amount of magnesium hydroxide was varied from 2.5 to 10 phr. The adhesive preparation was performed by means of an aqueous filler dispersion technique. The dispersion of magnesium hydroxide in adhesive was observed by SEM images. The mechanical property of the adhesive joint was conducted by shear stress according to the ASTM D1002 standard. The flame retardant property of adhesives was measured in the horizontal burning testing method. The results revealed that the magnesium hydroxide formed agglomeration. For mechanical test, incorporation of magnesium hydroxide caused a cohesive failure in the substrate. The amount of magnesium hydroxide at 7.5 phr. possessed a maximum adhesive shear stress of 1,140 N. This was due to the magnesium hydroxide acting as reinforcing filler. The flame retardant properties of magnesium hydroxide increased with increasing magnesium hydroxide content. However, only adhesive with 10 phr was lower than 75 mm/min. The results can finally be concluded that the incorporated of magnesium hydroxide at 10.0 phr. remarkable improved the flame retardant properties of adhesive materials.