Plastic-metal composite material and manufacturing method thereof

1. A manufacturing method of a plastic-metal composite material, wherein the composite material comprises a plastic and a metal, the method comprising:

S1. metal powder injection molding: subjecting a mixture of a metal powder and a binder to injection molding on an injection molding machine to form a metal structural member of a preset shape;

S2. metal structural member degreasing and sintering: subjecting the metal structural member to degreasing and sintering to remove the binder, so as to form 0.5-2 μm micron-sized micropores on a surface of the metal structural member;

S3. nanocrystallization of the micron-sized micropores: on the basis of the micron-sized micropores, forming 20-40 nm nano-sized micropores by etching with a chemical etching reagent; and

S4. injection molding with a mold: placing the metal structural member filled with a chemical reagent in an injection mold for injection molding and the plastic entering the nano-sized micropores.

2. The manufacturing method according to claim 1 , between Step S3 and Step S4, further comprising:

S300. reagent filling: filling the chemical reagent in the micropores on the surface of the metal structural member, to form a stable connection through a chemical reaction between the chemical reagent and the plastic.

3. The manufacturing method according to claim 1 , between Step S2 and Step S3, further comprising:

S200. cleaning: cleaning the metal structural member after degreasing and sintering to remove dirt and grease on the surface of the metal structural member.

4. The manufacturing method according to claim 1 , wherein the chemical reagent in Step S4 is one of an aqueous solution an organic solution, whose solute contains a functional group capable of forming a chemical bond through one of an esterification reaction, condensation polymerization, a substitution reaction and an addition reaction with the plastic.

5. The manufacturing method according to claim 4 , wherein components of the plastic comprise at least one of polyphenylene sulfide (PPS), polybutylene terapthaltate (PBT), and polyamide (PA), the solute is at least one of a small-molecule compound containing an amino functional group and an ester small-molecule compound, and the molecular weight of the small-molecule compound is less than 1,000, the molecular weight of the ester small-molecule compound is less than 1,000.

6. The manufacturing method according to claim 1 , wherein the metal is one of an aluminum alloy, a magnesium alloy, stainless steel, a zinc alloy and a titanium alloy.

7. The manufacturing method according to claim 2 , between Step S2 and Step S3, further comprising:

S200. cleaning: cleaning the metal structural member after degreasing and sintering to remove dirt and grease on the surface of the metal structural member.

8. The manufacturing method according to claim 4 , wherein components of the plastic comprise polycarbonate (PC), and the solute is a chemical crosslinking agent.

9. The manufacturing method according to claim 4 , wherein

the plastic is a plastic containing an amide structure, the solute is an alkene monomer compound, and the molecular weight of the alkene monomer compound is less than 1,000.