Aluminum powder coated with fluorine-based hydrocarbon polymer layer and preparation method therefor
The present invention relates to an aluminum powder coated with a fluorine-based hydrocarbon polymer layer, and a preparation method therefor. According to the present invention, the aluminum powder coated with a fluorine-based hydrocarbon polymer layer and a preparation method therefor enable the preparation of an aluminum powder coated with a fluorine-based hydrocarbon polymer layer, in which an additional oxidation reaction of the aluminum powder is achieved and fuel performance as a solid fuel is improved, by coating the fluorine-based hydrocarbon polymer layer on the surface of the powder.
1. An aluminum powder coated with a fluorine-based hydrocarbon polymer layer comprising an aluminum core; and a fluorine-based hydrocarbon polymer layer formed on the aluminum core, in which Al—F bonds are formed on a surface of the aluminum core by chemical reaction,
wherein the aluminum powder coated with the fluorine-based hydrocarbon polymer layer does not include aluminum oxide or includes aluminum oxide partially at a boundary between the aluminum core and the fluorine-based hydrocarbon polymer layer.
2. The aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 1 , wherein the aluminum core and the fluorine-based hydrocarbon polymer layer are in direct contact with each other.
3. The aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 1 , wherein a diameter of the aluminum core is 1 μm to 10 μm.
4. The aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 1 , wherein a thickness of the fluorine-based hydrocarbon polymer layer is 10 nm to 500 nm.
5. The aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 1 , wherein a polymer forming the fluorine-based hydrocarbon polymer layer is polyvinylidene fluoride (PVDF).
6. An underwater bonding material comprising the aluminum powder of claim 1 .
7. A diesel engine reactivity enhancing additive comprising the aluminum powder of claim 1 .
8. A solid fuel comprising the aluminum powder of claim 1 .
9. A powder material for the production of a three-dimensional structure comprising the aluminum powder of claim 1 .
10. A highly reactive material for welding comprising the aluminum powder of claim 1 .
11. A preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer of claim 1 , comprising the following steps:
eliminating the oxide film on the surface of the aluminum powder by a liquid phase process (step 1);
introducing a fluorine-based hydrocarbon polymer solution into a solution finished with step 1 above (step 2); and
recovering the aluminum powder coated with the fluorine-based hydrocarbon polymer layer on its surface (step 3).
12. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein a diameter of the aluminum powder particle of step 1 is 1 μm to 10 μm.
13. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein a solution used in the liquid phase process of step 1 is one or more solutions selected from the group consisting of a hydrofluoric acid solution, a nitric acid solution, a sulfuric acid solution, a citric acid solution, a maleic acid solution, an acetic acid solution, basic sodium hydroxide, basic potassium hydroxide and an aqueous ammonia solution.
14. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein the solvent used for the fluorine-based hydrocarbon polymer solution of step 2 is to inhibit the oxidation of aluminum powder.
15. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein the solvent used for the fluorine-based hydrocarbon polymer solution of step 2 is one or more solvents selected from the group consisting of N,N-dimethylforanamide (DMF, C 3 H 7 NO), dimethyl sulfoxide (DMSO) and tetrahydrofuran (THF).
16. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein the fluorine-based hydrocarbon polymer of step 2 is polyvinylidene fluoride (PVDF).
17. The preparation method of the aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 11 , wherein the step 3 additionally includes a step of heat-treating before recovering the aluminum powder coated with the fluorine-based hydrocarbon polymer layer.
18. The aluminum powder coated with a fluorine-based hydrocarbon polymer layer according to claim 1 , wherein one or more materials selected from the group consisting of aluminum hydroxide and aluminum fluoride are included at least partially between the aluminum core and the fluorine-based hydrocarbon polymer layer.