MikroCaps techniques

MikroCaps’ encapsulation techniques enable the encapsulation of various core materials with different polymer membranes, regardless of the industry. Depending on the properties of the core material and required characteristics of the encapsulated materials, MikroCaps uses different encapsulation techniques such as interfacial polymerisation, in-situ polymerisation, coacervation, spray drying, spray chilling and fluid bed coating.

The purpose of microencapsulation is usually defined by the permeability of the membrane, which is carefully selected to suit different systems and demands.

Slow release membrane – the core is released from the capsule over a longer period of time. The release time depends on the membrane type, the thickness and other characteristics and can vary from a few days to several months. The active ingredients can be water- or solvent-based and may be in a solid or liquid state. Applications with such a membrane include fragrances and flavours, fertilizers, pesticides, oils, and reactive chemicals.

Impermeable membrane – the core material is encapsulated inside the capsules, completely separated and protected against environmental effects. The purpose of such encapsulation is to ensure complete isolation from the environment. This solution is especially useful for phase change materials (PCM) that can be used in the textile and building industries. ane include fragrances and flavours, fertilizers, pesticides, oils, and reactive chemicals.

Smart membrane – the core is released in certain circumstances (due to mechanical forces, osmotic pressure, temperature increase…). One example is a microencapsulated fragrance that operates on the “scratch and sniff” principle, another example is the release of the active substance in the event of damage to the membrane shell (e.g., self-healing coatings), or situations where the active substance is not released before the system (e.g., coating) is finally applied.

MikroCaps technologies enable encapsulation of wide range of active materials

  • Organic-solvent-based or hydrophobic materials (both water non-miscible): The final product is a water-based dispersion with up to 45% capsules content (capsule size 5-50 µm). The water-based dispersion can be further dried to a powder form with up to 90% of active material (powder size 20-150 µm).
  • Water-based materials: The final product is a solvent-based dispersion with up to 45% capsules content (capsule size 5-50 µm).
  • Fine solid micron active materials: When using a process via emulsion formation the final product is a water-based dispersion of microcapsules (capsule size 5-50 µm). A water-based dispersion can be further dried to a powder form with up to 90% of active material (powder size 20-150 µm). When using a spray drying or spray chilling process a powder form with up to 60% of active material content (powder size 20-150 µm) is obtained.
  • Solid granulated material: By using a fluid bed coating 1-10 mm granules with up to 90% of active material are obtained.