초록 ▼

The present invention relates to a method for encapsulating an inorganic component in a wax, wherein the method comprises the following steps: i) subjecting the inorganic component to shearing forces such that deagglomeration of the inorganic component takes place, which step is carried out in the p

The present invention relates to a method for encapsulating an inorganic component in a wax, wherein the method comprises the following steps: i) subjecting the inorganic component to shearing forces such that deagglomeration of the inorganic component takes place, which step is carried out in the presence of the wax, with the wax functioning as a spacer to prevent reagglomeration, ii) subsequently increasing the temperature of the mixture from step i) to a value above the melting temperature of the wax, iii) quickly cooling the mixture obtained in step ii), and finally iv) reducing the solidified mixture from step iii) so as to obtain a wax comprising an inorganic component. The invention further relates to a wax particle obtained by the method and to the use of such wax particles in water-based protection systems.

대표청구항 ▼

The invention claim is: 1. A method for encapsulating an inorganic component in a wax, which comprises the following steps: i) subjecting an inorganic component to shearing forces such that deagglomeration of the inorganic component takes place, which subjecting is carried out in the presence of a

The invention claim is: 1. A method for encapsulating an inorganic component in a wax, which comprises the following steps: i) subjecting an inorganic component to shearing forces such that deagglomeration of the inorganic component takes place, which subjecting is carried out in the presence of a wax to form a mixture of the inorganic component and the wax, with the wax functioning as a spacer to prevent reagglomeration of the inorganic component, ii) subsequently increasing the temperature of the mixture from step i) to a value above the melting temperature of the wax, iii) quickly cooling outside the extruder the mixture obtained in step ii), and iv) reducing the solidified mixture from step iii) so as to obtain a wax comprising an inorganic component, wherein steps i)-ii) are carried out in an extruder, with the extruder comprising a cooled zone and a heated zone, in which cooled zone step i) is carried out. 2. The method according to claim 1, wherein a heated zone of the extruder comprises a temperature gradient with a starting temperature corresponding to room temperature and an end temperature corresponding to the temperature set in step ii). 3. The method according to claim 1 wherein the inorganic component is selected from the group of metal oxides, zinc white, sulfates, silicates, carbonates, silicas, and combinations thereof. 4. The method according to claim 3, wherein the inorganic component comprises barium sulfate. 5. The method according to claim 1 wherein the density of the inorganic component ranges from 2 to 4.49/cm3. 6. The method according to claim 1 wherein the wax is a synthetic wax, whether or not chemically modified, a semi-synthetic wax, a natural wax, or a combination thereof. 7. The method according to claim 1 wherein step i) is carried out in the presence of one or more additional components selected from the group of polymers and resins. 8. The method according claim 1 wherein after step iv), the reduced mixture is subjected to a micronisation treatment with air in an air jet mill, with a micronised wax particle being obtained. 9. The method according to claim 1 wherein the inorganic component comprises titanium dioxide. 10. The method according to claim 1 wherein the wax comprises a polyethylene wax, a polypropylene wax, a Fischer-Tropsch wax, whether or not chemically modified, an amide wax, a montane wax, bees wax, carnauba wax, or a combination thereof. 11. The method according to claim 1 wherein step i) is carried out in the presence of one or more additional components selected from the group of polytetrafluorethylene, polyurea polymers and ureaformaldehyde condensates. 12. A wax particle obtained by carrying out the method according to claim 1 wherein the amount of inorganic component ranges from 1 to 5% by volume, based on the volume of the obtained wax particle, which inorganic component is homogeneously distributed in the wax wherein the density of the wax particle thus obtained ranges from 1.0 to 1.4 g/cm3. 13. The wax particle according to claim 12, wherein the spacing between the inorganic components in the wax matrix varies between 0.5 and 2.5 μm. 14. A wax particle according to claim 12 wherein the size of the wax particle ranges from 1 to 50 μm. 15. A method for preparing a wax dispersion wherein the wax particle according to claim 12 is ground in the presence of one or more components selected from the group consisting of water, resins, solvents, cosolvents and additives so as to form the wax dispersion.