By Gerd Habenicht
This handbook offers crucial details on profitable bonding. a variety of useful advices and important guidance are beneficial for the dealing with of adhesives. as a result of its didactically based content material, the booklet can also function a medium for education classes in bonding engineering. the fundamentals of this leading edge becoming a member of approach are defined in a pragmatic and simply comprehensible manner appropriate for the appliance in exchange and undefined.
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Additional info for Applied Adhesive Bonding: A Practical Guide for Flawless Results
Then, existing solvent residues evaporate through the adherends. Since the organic solvents used are combustible, special care has to be taken to keep these adhesives away from ignition sources during their processing. Furthermore, it has to be mentioned that vapors of organic solvents are usually heavier than air and sink to the bottom during evaporation, where they can “creep” so that even more distant ignition sources may cause an ignition. In general, bonding with solvent-based adhesives should be carried out under suitable exhaust units.
Hot-melt adhesives, for example, are applied as melt within a temperature range of approx. 120–240 °C. In the case of thermoset materials the depicted temperature dependence depends much on the crosslinked state. 6 Temperature dependence of the polymer state of thermoplastic and thermosets (diagrammatic). 3 Properties of Adhesive Layers 21 With continuously rising temperatures, a chemical decomposition of the polymers sets in, that is, the thermal decomposition of the molecule structures. This process is irreversible, which means it cannot be reversed by cooling down.
Processing occurs by mixing the components A and B. The accelerator contained in component A together with the hardener in component B trigger off the reaction. The user can choose between AB adhesives with different pot lives. Another possibility is the application of component A to one adherend and of component B to the other. After the ﬁxing of the adherends both components mix, which results in the curing of the adhesive layer. Alternatively, the components A and B can be applied one over the other in the form of two adhesive lines.
Applied Adhesive Bonding: A Practical Guide for Flawless Results by Gerd Habenicht