Adhesive, it’s trivial name is glue, is a material that is capable of holding together solid material with a help of surface attachment. Therefore, adhesion is occurrence of bonding of surfaces. In my diploma thesis I studied different adhesives and their use. I mainly focused on viscosity of adhesives. Viscosity is a measure of the inhibition of moving layers of a liquid, on which it’s ability to stream depends. With a help of literature, I studied the effect of rubber’s molecular mass and resin content in rubber on viscosity of natural rubber. It was concluded that viscosity of adhesive increases with the increase of molecular mass of the rubber and the content of resins. From literature I searched data on soybean protein adhesive and it’s properties and effect of viscosity. It was concluded that adhesives with lower viscosity wet the surface better when applied, and the adhesion strength is affected by the pressure, which was applied during the adhesion process.
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