| Résumé : |
Reactive hot melt (RHM) adhesives are solvent free, one-part solids at room temperature. These materials are heated to their molten state prior to use, then pumped and dispensed onto construction pieces in a hot and tacky state. When the assembled substrates cool back to ambient temperature, the bond strength builds up rapidly. The adhesives then start to react with moisture absorbed inside the assembled pieces to form a highly crosslinked network. The cured assemblies show significantly better heat resistance than assemblies glued with conventional one-part hot melt adhesives. However, in general, the initial strengths of conventional hot melt adhesives are better than that of reactive type materials.
In a commercial assembling process, manufacturing cost reductions through improved production rates are highly desirable. Therefore, increasing the curing rate while maintaining the melt stability of the RHMs has always been a desirable and challenging target. In this paper, a new technology is described that has enabled a series of fast cure reactive hot melt adhesives with excellent melt stability characteristics to be prepared and commercialized. |
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Fast cure reactive hot melt adhesives maintain melt stability in ADHESIVES AGE, Vol. 40, N° 2 (02/1997)
