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the key materials properties that are required generally for hot melt

Views:4     Author:Site Editor     Publish Time: 2019-11-19      Origin:Site

This article first reviews the key materials properties that are required generally for hot melt  adhesives. The formulating principles and potential product possibilities available with EVA hot melt adhesives are then reviewed, and starting formulations are offered for specific  applications.  Key Material Properties Required for Hot Melt Adhesives  Hot melt adhesives facilitate fast production speeds because the adhesives set simply by  cooling from a molten liquid to a cohesive solid. Hot melts do not require processing time for  evaporation of solvents or water carrier or for a chemical reaction to occur. This also generally  results in lower energy and maintenance costs.  Hot melt formulations contain polymers to provide strength and hot tack, and tackifiers and oils or plasticizers to reduce melt viscosity, adjust glass transition temperature, and improve  wetting. Some formulations also contain waxes to speed setting and further reduce viscosity.  These additives are generally high concentrations (comparable to the base polymer) in hot  melt adhesive formulations. Fillers are also used to increase melt viscosity to reduce  excessive penetration into porous substrates and to modify cohesive properties. Antioxidants  are generally added to prevent thermal oxidation during processing and service. Additives  often consist of blends of two or more materials to optimize certain properties. A typical EVA  hot melt formulation for packaging is indicated in Table 2.


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