Polymerization Microencapsulation In Situ

We added to the microcapsule an in situ polymerization (coming only from the aqueous phase) to give the microcapsules additional properties requested by our customers.

How microencapsulation by In situ Polymerization works

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    1. Dispersion of the liquid to be encapsulated in water

    In a stirred tank, the liquid to be encapsulated is dispersed in water. The size of the droplets obtained is regulated by the speed of the stirrer.

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    2. Introduction of the monomers A and B into the solution

    Monomers which are small molecules are then introduced into the stirred tank, they will form a polymer by so-called polymerization chemical reactions.

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    3. Initiation of the polymerization process

    The polymerization reaction is initiated by PH changes (acids or bases are introduced) or / and temperature can be accelerated by the use of catalysts. The polymer formed is deposited around the drops which leads to encapsulation.

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    4. Stabilization of the polymer structure

    The polymer is then consolidated by changes in pH or temperature or the addition of additives (crosslinking). This leads to better isolation of the encapsulated asset.
    The finishing operations are then carried out, they consist in adjusting the acidity of the medium, as well as the viscosity.

Hard microcapsules very tight and chemically resistant, with a diameter of 1 to 100 μ, release of the asset by mechanical breakage of the envelope with adjustable brittleness, presentation in slurry or powder.

Discover all the fields of application microencapsulation works