Method for preparing metal-polymer resin composite
The present disclosure relates to a method for preparing a metal-polymer resin composite with excellent bonding strength and bonding uniformity. The method includes a pretreatment step (S1) of etching a metal member, an electrolysis process step (S2) of forming an adhesive coating layer on a surface of the pretreated metal member, a drying step (S3) of drying the metal member with the adhesive coating layer formed on the surface, and an injection-molding process step (S4) of bonding a polymer resin to the dried metal member, and the electrolysis process is performed in an electrolyte solution containing a sulfur-containing compound and a metal chelate compound.
1 . A method for preparing a metal-polymer resin composite, the method comprising:
a pretreatment step (S1) of etching a metal member, which is one or more selected from a group consisting of copper, a copper clad, and a copper alloy;
an electrolysis process step (S2) of forming an adhesive coating layer on a surface of the pretreated metal member;
a drying step (S3) of drying the metal member with the adhesive coating layer formed on the surface; and
an injection-molding process step (S4) of bonding a polymer resin to the dried metal member,
wherein the electrolysis process is performed in an electrolyte solution containing a sulfur-containing compound and a metal chelate compound,
wherein the injection-molding process step (S4) is performed by preheating the metal member to an injection-molding temperature and then directly injection-molding the polymer resin onto the preheated metal member, and
wherein the electrolyte solution is prepared by mixing 5 g to 500 g of the sulfur-containing compound and 1 g to 100 g of the metal chelate compound for each 1 L of distilled water.
2 . The method of claim 1 , wherein the sulfur-containing compound is one or more selected from sulfuric acid, ammonium sulfate, and sodium sulfate.
3 . The method of claim 1 , wherein the metal chelate compound is one or more selected from a group consisting of copper ethylenediaminetetraacetate (EDTA-Cu), disodium copper ethylenediaminetetraacetate (EDTA-2NaCu), and diammonium copper ethylenediaminetetraacetate (EDTA-Cu(NH 4 ) 2 ).
4 . The method of claim 1 , wherein the electrolyte solution further contains one or more copper organic compounds selected from a group consisting of cupric chloride, copper (II) trifluoroacetate hydrate, cupric hydroxide, cupric carbonate, and copper oxide.
5 . The method of claim 1 , wherein the electrolysis process (S2) is performed by immersing the metal member in the electrolyte solution and performing electrolysis at a temperature in a range from 15° C. to 80° C. for 60 seconds to 3600 seconds at a constant voltage in a range from 0.1V to 50V.
6 . The method of claim 1 , wherein the pretreatment step (S1) is performed by sequentially performing a degreasing process step (S1-1), an etching process step (S1-2), and a desmut step (S1-3).
7 . The method of claim 6 , wherein the etching process step (S1-2) is performed by immersing the metal member in an etching solution at a temperature in a range from 15° C. to 80° C. for 30 seconds to 300 seconds.
8 . The method of claim 7 , wherein the etching solution is a mixed solution of 5 g to 500 g of strong acid and 5 g to 200 g of hydrogen peroxide for each 1 L of distilled water.
9 . The method of claim 6 , wherein the desmut step (S1-3) is performed via immersing the metal member in an alkaline aqueous solution; or via immersing the metal member in the alkaline aqueous solution and performing an ultrasonic treatment,
wherein the immersing is performed at a temperature in a range from 15° C. to 80° C. for 30 seconds to 300 seconds.
10 . The method of claim 9 , wherein the alkaline aqueous solution is a mixed solution of 5 g to 200 g of at least one selected from alkali metal hydroxide and alkaline earth metal hydroxide for each 1 L of distilled water.
11 . The method of claim 1 , wherein the metal member is washed with hot water before the drying in the drying step (S3).
12 . The method of claim 11 , wherein the hot water washing is performed using distilled water at a temperature in a range from 15° C. to 100° C.
13 . The method of claim 1 , wherein the polymer resin is one or more selected from a group consisting of polybutylene terephthalate, polyphenylene sulfide, polyphthalamide, polyethylene terephthalate, polycarbonate, polypropylene, polyimide, polyethylene, liquid crystal polymer, polyether ether ketone, polyaryl ether ketone, polyamide, polyamide6, and polyamide66.