Encapsulated anti-ultraviolet agent and methods for preparing the same
The present disclosure provides an encapsulated particle for anti-UV radiation. The encapsulated particle includes a core comprising an anti-UV agent, and a shell at least partially enclosing the core and comprising a polymer. Due to the presence of the shell, the anti-UV agent can be released into surroundings at a controlled manner. The encapsulated particle can be incorporated into coatings or articles to extend their service life.
1. An encapsulated particle comprising:
a core comprising an anti-ultraviolet (UV) agent, wherein the anti-UV agent is zinc oxide and the core has a size between 30 nm and 20 μm; and
a first shell at least partially enclosing the core and comprising a first polymer, wherein the first polymer is a metal alginate, the first shell has a thickness between 160 μm and 2 mm; or
a core comprising an anti-UV agent wherein the anti-UV agent is (2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl))phenol) and the core has a size between 500 nm and 20 μm and
a first shell at least partially enclosing the core and comprising a first polymer, wherein the first polymer is poly(methyl methacrylate) and the first shell has a thickness between 160 μm and 2 mm.
2. The encapsulated particle of claim 1 further comprising a second shell enclosing at least partially the first shell and comprising a second polymer.
3. The encapsulated particle of claim 2 , wherein the second polymer is a polysaccharide, a gelatin, a polyacrylate, a polystyrene, a polyurethane, a chitosan, or a polyester.
4. The encapsulated particle of claim 2 , wherein the second shell has a thickness between 2 μm and 1000 μm.
5. The encapsulated particle of claim 2 further comprising a third shell enclosing at least partially the second shell and comprising a third polymer.
6. The encapsulated particle of claim 2 , wherein the anti-UV agent is zinc oxide, the core has a size between 30 nm and 500 nm, the first polymer is a metal alginate, the first shell has a thickness between 50 μm and 1 mm, the second polymer is chitosan, and the second shell has a thickness between 2 μm and 1000 μm.
7. A coating comprising:
a matrix; and
a plurality of encapsulated particles of claim 1 , wherein the plurality of encapsulated particles are present within the matrix.
8. The coating of claim 7 , wherein the matrix comprises a polymeric matrix.
9. The coating of claim 8 , wherein the polymeric matrix comprises a polyester.
10. The coating of claim 7 further comprising a dye.
11. An article comprising:
a matrix; and
a plurality of encapsulated particles of claim 1 , wherein the plurality of encapsulated particles are present within the matrix.
12. The article of claim 11 , wherein the matrix comprises a polymeric matrix.
13. The article of claim 12 , wherein the polymeric matrix comprises a polyester or a polypropylene.