Good evening, I know that 2K adhesives harden through a reaction, but why do they ultimately stick and how do the cohesive and adhesive forces work?
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A distinction is made between the inner connection between the adhesive molecules and the adhesion between adhesive and substrate. The adhesion forces can be quite comparable. It is more important to the surface energy of the materials to be bonded and how well the adhesive adheres. In many 1-C adhesives, the curing process is triggered by the evaporation of a solvent, which can take a long time, or by a crosslinking which is caused by water molecules from the atmospheric humidity. As with silicone, or many mounting adhesives. This takes just until the adhesive is then cured by the full adhesive joint. Mostly 4 – 5 mm per day. At 2 -C adhesives, the initial state is liquid or pasty and a hardener is admixed, whereby the hardening process takes place in a short time in the entire adhesive volume. The range of strengths is enormous. A good mounting adhesive can have a tensile strength of 2-6 N/mm2. In reaction resins, such as epoxide, this can go up to over 65 N/mm2. They’re usually a little more brittle.
IdR better than 1K adhesive, depending on the application. However, one has to pay attention to the exact mixing ratio. Something too little or too much haerter quickly means a significant loss of quality. The molecular structure is then unclean.