Applications and requirements
2C self-leveling casting resins and adhesives
Low-viscosity epoxy resins are usually commercially available as 2C systems. These must be precisely mixed and dispensed in the specified mixing ratio according to the manufacturer's instructions and technical data sheet. As polyaddition adhesives, epoxies, like polyurethanes, are very sensitive to variations in the mixture.
In most cases, the A component corresponds to the epoxy resin. The B-component contains the hardener, which is often based on amines or thiols. The viscosity of the B-component is often significantly lower than that of the A-component.
After mixing resin and hardener, the reactive volume is subject to a time-limited processing time, since the chemical reaction of curing already starts from the first contact of resin and hardener and thus leads to a more or less rapid increase in viscosity. This time interval is referred to as the pot life.
One property of epoxy casting resins is the high exothermicity of the curing reaction, i.e. larger quantities of the reactive mixture can give off a considerable amount of heat during the crosslinking reaction. Especially in high-volume applications, this can lead to component damage. An appropriate potting strategy with sequential application can control this effect. We are happy to support you with process development in our laboratory.
With the material preparation system MPS (Material Preparation System), the material is permanently recirculated in the line system, tempered and prepared under vacuum without gas bubbles. Pressure sensor control at critical points of the preparation system guarantees seamless process control over every production cycle. In addition, the material preparation system can also be refilled during operation in order not to lose machine availability due to unnecessary downtimes during refilling.