Metal-resin composite and preparation method

1. A metal-resin composite, comprising:

a metal substrate having a first surface and a second surface;

a porous resin layer formed on the first surface of the metal substrate;

a plastic layer formed on the porous resin layer; and

a pore passage;

wherein the pore passage passes through the porous resin layer and the first surface of the metal substrate and ends between the first surface and the second surface of the metal substrate, and the plastic layer fills in the pore passage to bond with the metal substrate.

2. The metal-resin composite of claim 1 , wherein the pore passage has a pore passage diameter of about 0.1 microns to about 20 microns, and extends into the metal substrate with a depth of about 5 microns to about 200 microns.

3. The metal-resin composite of claim 1 , wherein the metal substrate is made of aluminum, aluminum alloy, stainless steel, magnesium, or magnalium alloy.

4. The metal-resin composite of claim 1 , wherein the porous resin layer is formed by heating and curing an adhesive resin composition under vacuum, and the adhesive resin composition comprises an adhesive resin, a curing agent, a coupling agent and a solvent.

5. The metal-resin composite of claim 4 , wherein based on 100 weight parts of the adhesive resin, the curing agent has a content of about 5 weight parts to about 50 weight parts, the coupling agent has a content of about 0.3 weight parts to 18 weight parts, and the solvent has a content of about 5 weight parts to about 200 weight parts.

6. The metal-resin composite of claim 4 , wherein the adhesive resin is at least one selected from a group consisting of epoxy resin, urea resin, polysulfone resin and phenolic resin.

7. The metal-resin composite of claim 4 , wherein the curing agent is at least one selected from a group consisting of organic acid anhydride, dicyandiamide, amino resin and thermosetting acrylic resin.

8. The metal-resin composite of claim 4 , wherein the coupling agent is at least one selected from a group consisting of silane coupling agent, titanate coupling agent, bimetallic coupling agent, phosphate coupling agent, borate coupling agent and chrome complex.

9. The metal-resin composite of claim 4 , wherein the solvent is at least one selected from a group consisting of butyl acetate, ethyl acetate, ethyl alcohol, xylene, methyl isobutyl ketone and isopropanol.

10. The metal-resin composite of claim 1 , wherein the plastic layer is made of a resin composition, and a resin in the resin composite is at least one selected from a group consisting of polyolefin, polycarbonate, polyester, polyamide, polyaromatic ether, polyether imide, polyphenyl ether, polyphenylene sulfide, polyimide, polysulfone, polyether ketone and polyurethane.

11. A method of preparing a metal-resin composite, comprising:

forming a porous resin layer on a first surface of a metal substrate to obtain a metal substrate formed with a porous resin layer, wherein the metal substrate has the first surface and a second surface;

forming a pore passage by etching the metal substrate formed with the porous resin layer; and

forming a plastic layer on the porous resin layer;

wherein the pore passage passes through the porous resin layer and the first surface of the metal substrate and ends between the first surface and the second surface of the metal substrate, and the plastic layer fills in the pore passage to bond with the metal substrate.

12. The method of claim 11 , wherein forming the porous resin layer on the first surface of the metal substrate further comprises:

coating an adhesive resin composition on the metal substrate, and heating and curing the adhesive resin composition under vacuum to form the porous resin layer, wherein the adhesive resin composition comprises an adhesive resin, a curing agent, a coupling agent and a solvent.

13. The method of claim 12 , wherein based on 100 weight parts of the adhesive resin, the curing agent has a content of about 5 weight parts to about 50 weight parts, the coupling agent has a content of about 0.3 weight parts to 18 weight parts, and the solvent has a content of about 5 weight parts to about 200 weight parts.

14. The method of claim 12 , wherein the adhesive resin is at least one selected from a group consisting of epoxy resin, urea resin, polysulfone resin and phenolic resin.

15. The method of claim 12 , wherein the curing agent is at least one selected from a group consisting of organic acid anhydride, dicyandiamide, amino resin and thermosetting acrylic resin.

16. The method of claim 12 , wherein the coupling agent is at least one selected from a group consisting of silane coupling agent, titanate coupling agent, bimetallic coupling agent, phosphate coupling agent, borate coupling agent and chrome complex.

17. The method of claim 12 , wherein the solvent is at least one selected from a group consisting of butyl acetate, ethyl acetate, ethyl alcohol, xylene, methyl isobutyl ketone and isopropanol.

18. The method of claim 11 , wherein the pore passage has a pore passage diameter of about 0.1 microns to about 20 microns and extends into the metal substrate with a depth of about 5 microns to about 200 microns.

19. The method of claim 11 , wherein the metal substrate is made of aluminum, aluminum alloy, stainless steel, magnesium or magnalium alloy.

20. The method of claim 11 , wherein forming the plastic layer on the porous resin layer comprises injection molding a resin composition on the porous rein layer, and a resin in the resin composite is at least one selected from a group consisting of polyolefin, polycarbonate, polyester, polyamide, polyaromatic ether, polyether imide, polyphenyl ether, polyphenylene sulfide, polyimide, polysulfone, polyether ketone and polyurethane.