Solid matter micro-encapsulated by an aminoplast and method for producing the same
AssigneeFraunhofer-Gesellschaft zur Forderung der Angewandten Forschubg E.V.
InventorsRudolf Nastke, Gerald Rafler
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Abstract
Micro-encapsulated particles of solid material are described and a quasi-continuous method for the production thereof, in particular those with a water-insoluble character or in a hydrophobised form taking into account in particular an ecologically and economically favourable recycling of the used media and the resultant smallest possible amount of waste products, such as waste water, polymer residues inter alia while simultaneously ensuring the coating even of exposed parts of the solid bodies, such as crystal tips, grooves and the like which, due to the hydrodynamic conditions at these points, can only be coated inadequately with standard methods.
Claims26
Particles of solid material micro-encapsulated by an aminoplast,
- characterised in that
- the aminoplast is the condensation product from partially etherified amino resin pre-condensates, of which at least one component has a high surface activity due to a co-condensation with an ethoxylated fatty amine with a KOH number between 80 and 140.
Particles of solid material according to one of the preceding claims,
- characterised in that
- the thickness of the micro-encapsulation on the entire particle is less than 300 nm.
Particles of solid material according to one of the preceding claims,
- characterised in that
- the surface of the particle is hydrophobised and/or a hydrophobisation agent is contained in the aminoplast.
Method for production of particles of solid material micro-encapsulated by aminoplasts,
- characterised in that
- a) the particles of solid material are introduced into a reaction vessel in which an acid-catalysed polycondensation occurring in aqueous phase is implemented by at least two amino resin pre-condensates, of which at least one has been modified due to co-condensation with an ethoxylated fatty amine with a KOH number between 80 and 140.
- b) a post-curing of the polymer is effected in a larger collection vessel with continuous removal option of the medium and
- c) the micro-encapsulated particles of solid material are separated from the original solution and are dried and
- d) the original solution is re-processed and re-supplied to the method.
Dependencies are inferred from the claim text.