Professional Polymer Technology
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The performance of solvent-based adhesives is essential […]
The performance of solvent-based adhesives is essentially determined by the polymer system in the formulation. Picking out backing type will depend on the actual substrates and environmental resistance needed - temperature resistance, essential oil and plasticizer resistance, and so forth. Most solvent based glues contain flammable solvents which require proper precautions for safe handling. Additionally, many organic and natural solvents are controlled due to environmental concerns with emissions.
Within each type of solvent established adhesive, formulations are available to complement the application requirements of the task - wash, roll, bead or bow, spray. As soon as the adhesive is applied, solvent evaporates relatively quickly creating an increase in viscosity of the adhesive film. Bonds can be made immediately after adhesive application or after some solvent has evaporated but before the backing has dried to the point where it is going to no longer wet (open time). Waiting for some evaporation prior to bonding (set time) increases the first strength of the backing bond and allows devices to be processed more quickly.
The time windowpane for proper bonding is specified by the backing manufacturer. Coating both substrates and waiting until the adhesive sets before relationship typically provides the best initial bond strength with longest open time. In the event assembly and processing requires extending open time or very high initial power, the adhesive can be coated and dried then activated by spraying, scrubbing, or rolling with a light coat of solvent to develop surface add on the adhesive. Solvent based adhesives remain solucionable in organic and natural solvent after drying. This reduces the need for equipment maintenance and facilitates clean-up. Attention must be taken to follow manufacturers' tips for safe handling of solvents.
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