KR20090027317A - Composite of nonferrous metal and resin and making method for manufacturing the same - Google Patents

Abstract

Composite of resin and metal material for improving the cohesive property and a manufacturing method thereof are provided to simplify a manufacturing process by excluding an adhesive coating process. A manufacturing method of composite of resin and metal material comprises: a step of processing the shape of the metal material which forms a base layer(10); a step of removing the fatty oils and organic impurity from the metal material surface; a step of polishing the surface of the metal material; a step of removing the smut formed in the surface of metal material; a step of forming a porous film layer(40) had a plurality of air holes(41) in the surface of the metal material; a step of drying the metal material; a step of performing injection molding the metal material and the plastic; a step of coloring the surface of the metal material with the specific color; and a step of sealing the air holes of the porous film layer of the metal material.

Description

Composite of nonferrous metal and resin and making method for manufacturing the same

The present invention uses anodization to improve the adhesion of the resin by injection molding the plastic to the metal body, and to add various colors to the metal body. It relates to a complex of and a preparation method thereof.

The technology of integrating metal and resin is required in a wide range of fields such as mobile phones, automobiles, and industrial equipment. In particular, aluminum (Al) is used as a main material for aircraft, ships, and vehicles by using light properties. In addition, since oxidation does not occur well, it is used for food industry, tableware, etc., and is also used for paints, building materials and raw materials. In addition, it is very flexible, so it can be made very thin. Therefore, it is widely used for making kitchen foils, printing plates, high-quality packaging paper, communication equipment, semiconductors, electronics, electronic parts, and leisure products.

However, it is difficult to realize a precise shape in the aluminum itself, it is used by assembling other components by bonding a resin formed with a complex shape on the surface of the aluminum with an adhesive.

However, in the case of bonding using an adhesive, when used for a long time, the adhesive force is lowered, and aluminum and resin are separated, resulting in damage to the product.

And, in order to solve the problem using the adhesive as described above, the Republic of Korea Patent Application No. 10-2003-7011585 "a composite of aluminum alloy and resin and its manufacturing method" is published.

It is introduced a method of injection molding a specific resin of polybutylene terephthalate (PBT) series reacting with the amine chemicals, using the amine chemicals.

However, in the prior art as described above, the resins that can be attached to aluminum are limited to the specific products, that is, only the PBT series.

In addition, since additional processes such as immersion of aluminum in amine chemicals are performed, the manufacturing process has a complicated problem.

An object of the present invention is to solve the problems of the prior art as described above, by using anodization, the metal body is improved adhesion of the resin by injection molding the plastic to the pores formed in the porous film layer of the metal body It is to provide a composite of the resin and its preparation method.

It is another object of the present invention to provide a composite of a metal body and a resin and a method for manufacturing the same, which can realize various colors by coloring a porous coating layer.

Method for producing a composite of a metal body and a resin according to the present invention for achieving the above object comprises a shape processing step of processing the shape of the metal body forming the base layer; A degreasing step of removing the organic contaminants and the maintenance of the surface of the metal body in which the shape processing step is completed; Polishing polishing step of processing so that the surface of the metal body is completed the degreasing step is polished; A desmut step of removing a smut formed on the surface of the metal body in which the polishing step is completed; Anodizing to form a porous film layer having a plurality of pores on the surface of the metal body in which the disaste step is completed; A drying step of drying the metal body in which the anodization step is completed; An injection molding step of injection molding the plastic on at least one surface of at least one surface of the metal body in which the drying step is completed; A coloring step of adding color to the surface of the metal body in which the injection molding step is completed; It comprises a sealing step of sealing the porous film of the metal body is completed the coloring step.

In another aspect, a method for manufacturing a composite of a metal body and a resin according to the present invention includes a shape processing step of processing a shape of a metal body forming a base layer; A degreasing step of removing the organic contaminants and the maintenance of the surface of the metal body in which the shape processing step is completed; Polishing polishing step of processing so that the surface of the metal body is completed the degreasing step is polished; A desmut step of removing a smut formed on the surface of the metal body in which the polishing step is completed; Anodizing to form a porous film layer having a plurality of pores on the surface of the metal body in which the disaste step is completed; A coloring step of adding color to the surface of the metal body in which the anodization step is completed; A drying step of drying the metal body in which the coloring step is completed; An injection molding step of injection molding the plastic on at least one surface of at least one surface of the metal body in which the drying step is completed; It comprises a sealing step of sealing the pores of the porous coating layer of the metal body the injection molding step is completed.

The composite of the metal body and the resin according to the present invention includes a base layer formed of a metal body and forming a basic appearance; In a composite of a metal body and a resin, which is injection molded into plastic and comprises a resin layer bonded to at least one surface of the base layer, a porous coating layer having a plurality of pores is formed between the base layer and the resin layer, The resin layer is inserted into the pores, characterized in that coupled to the base layer integrally.

According to the manufacturing method of the composite of the metal body and the resin of the present invention as described above, since the plastic is injection molded and bonded to the pores of the porous film layer 40 generated by anodization, there is an advantage that the adhesion is improved.

In addition, since a separate process such as applying an adhesive is not required, the manufacturing method has a simple advantage.

Therefore, the mass production is possible, there is an advantage that the price competitiveness increases.

In addition, since the dye can penetrate the pores of the porous film layer produced by anodization, it is possible to implement a variety of colors, there is an advantage that the decorative properties are improved.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments within the scope of the same idea.

Hereinafter, a composite of a metal body and a resin and a manufacturing method thereof will be described with reference to FIGS. 1 to 4.

1 is a flowchart illustrating a method of manufacturing a composite of a metal body and a resin according to the spirit of the present invention in order. FIG. 2 is an enlarged perspective view of a part of the porous coating layer, which is a main component of the present invention. 3 is a perspective view illustrating one embodiment according to the spirit of the present invention, and FIG. 4 is an enlarged cross-sectional view of the cross-sectional view taken along line II ′ of FIG. 3.

The metal body applied in the present invention is aluminum (Al), magnesium (Mg), titanium (Ti), zinc (Zn), zirconium (Zr), hafnium (Hf) in which pores are formed by anodizing (anodizing method) , Tantalum (Ta), niobium (Nb), and one of the metal to form a porous coating layer by anodization will be found to be applicable to all, the following will be described as aluminum as an example.

First, a shape processing step S100 of processing a metal body having a predetermined thickness into a predetermined shape is performed. The shape processing step (S100) is a shape processing according to the product to which the composite of the metal body and the resin is applied, Figure 3 shows an example of the back cover of the mobile phone battery. That is, the metal body forms a base layer 10 that forms the overall appearance of the composite of the metal body and the resin, and is processed into a shape suitable for the product to be applied as shown in FIG.

Thereafter, a degreasing step (S200) of removing the organic contaminants and the maintenance of the surface of the metal body in which the shape processing step (S100) is completed is performed. The degreasing step (S200) is a process of removing the oil, fat, dust, fingerprints, etc. generated on the surface of the shape processing step (S100), or the metal body using an organic solvent.

When the degreasing step (S200) is completed, it goes through several washing process (S210). This washing process (S210) is a process of cleaning the organic solvent and impurities on the surface while going through the degreasing step (S200), which is processed at room temperature using general flowing water.

Then, when the degreasing step (S200), that is, the water washing process (S210) is completed, the polishing step (S300) is performed so that the surface of the metal body is polished. The polishing step (S300) is to revive the original luster of the metal body through the chemical polishing or electropolishing depending on the nature, purpose, cost of the metal body. For example, the polishing of ultra-high or high-purity aluminum phase reflection purpose is better in electropolishing, and the processing cost associated with the initial installation is less chemical polishing than electropolishing.

In general, chemical polishing uses dilute acid or concentrated acid containing an oxidizing agent, and electrolytic polishing is immersed in a current-flowing tank after the pretreatment (S100 ~ S210) to electrolyte the parts to the anode.

When the gloss polishing step (S300) is completed, through the washing process (S310) again, to remove the foreign matter generated in the polishing step (S300).

When the washing process (S310) is completed, the desmut step (S400) for removing the metal alloy component, that is, the smut (Smut) generated on the surface of the metal body in the step (S100 ~ S310) is Is carried out. This is easily removed by hand, for example, if a large number of alloying components in the aluminum material is generated a lot of matte and the color is also dark black, in the dismat step (S400) by using nitric acid (20 ~ 30%, capacity), Remove the salt on the surface of the sieve.

Then, when the dismat step (S400) is completed, and again through the washing process (S410), to remove the foreign matter generated in the dismat step (S400).

When the washing process (S410) is completed, the anodizing step (S500) is formed to form a porous film layer 40, a plurality of pores 41 are formed on the surface of the metal body as shown in FIG.

The anodization step (S500) is carried out by anodizing sulfuric acid (Sulfuric acid) method, specifically, the process described above in a bath containing an electrolyte consisting of 80% water and 20% sulfuric acid (S100) After immersing the metal body of which S410 is completed, it advances by applying a (+) electrode to a metal body, and applying a (-) electrode to a tank. In this case, the electrolyte solution is preferably maintained at a temperature (for example, 24 to 27 ℃) to the extent that the oxidation reaction can actively occur.

Substantially in the anodization step (S500), if the metal body, that is, aluminum is anodized in an acid solution such as sulfuric acid, chromic acid, phosphoric acid, etc., the porous surface of the plurality of pores 41 are formed on the surface of the aluminum as shown in FIG. An oxide film that is a coating layer 40 is formed.

The thickness of the porous coating layer 40 depends on factors such as electrolysis time, current density, and the like. The longer the electrolysis time and the higher the current density, the thicker the porous film layer 40 is. That is, the porous coating layer 40 is proportional to the amount of current, and when the temperature of the electrolytic solution is low during electrolysis, the growth of the oxide film is improved and the rigid porous coating layer 40 is formed, and when the temperature is low, the thin and soft porous coating layer ( 40) is formed.

In addition, the porous coating layer 40 is substantially high in hardness and has excellent characteristics in terms of wear resistance and aesthetic appearance. In addition, as the porous film layer 40 has a higher purity of aluminum, a beautiful and glossy film can be obtained, and the glossiness and beauty are dependent on the above-described steps (S100 to S410).

Then, when the anodization step (S500) is completed, the washing step (S510) again, the drying step (S600) to remove the foreign matter generated in the anodization step (S500) and then dry.

The drying step (S600) is to be carried out in the air at room temperature (about 20 ~ 30 ℃), so that the pores of the porous coating layer 40 is not blocked. In addition, the above-described step (S100 ~ S600) is performed in a clean room where fingerprints, organic matter, dirt, etc. are not generated.

Thereafter, an injection molding step (S700) of forming a resin layer 30 by injection molding plastic on at least one surface of the metal body in which the drying step (S600) is completed is performed.

The injection molding step (S700) is a process of forming a complex shape difficult to form a metal body, as shown in Figure 3, the plastic stock solution is inserted into the pores 41 of the porous film layer 40 formed in the above-described process, It is molded integrally with a metal body.

That is, as shown in FIG. 4, the lower surface of the resin layer 30 is inserted into the pores of the porous coating layer 40, so that the resin layer 30 is integrally bonded to the metal body, that is, the base layer 10. .

The plastic may be injection molded of any one of polyphenylene sulfide (PPS), polystyrene (PS), polycarbonate (PC), polyester (PET), polyethylene (PE), and polytetrafluoroethylene (PTFE). All kinds are applicable.

Then, when the injection molding step (S700) is completed, the coloring step (S800) for adding a color to the surface of the metal body of the non-injection molding is performed. In the coloring step (S800), a dye is infiltrated into the numerous pores 41 of the porous film layer 40 to form a predetermined color. In detail, when the dye is immersed in the dye solution mixed with a certain ratio of water, the dye penetrates only a part of the pores 41 (within 50% of the pore depth), and the metal body has a predetermined color.

On the other hand, the coloring step (S800) may be carried out earlier than the injection molding step (S700) described above. That is, after coloring the entire surface of the anodized metal body, and after performing the drying step (S600) it can be injection molded plastic on the surface of the colored metal body.

When the coloring step (S800) is completed, the sealing step (S900) for blocking the pores 41 of the porous film layer 40 is carried out. The sealing step (S900) is a process of blocking the remaining portion of the dye-infiltrated pores 41, to enhance the corrosion resistance of the porous coating layer 40, to prevent the discoloration or evaporation of the dye, the change of color even in long-term use To prevent.

The sealing step (S900) is carried out by mixing boric acid and nickel acetate in a predetermined ratio, and then immersing the metal body of the coloring step (S800) or injection molding step (S700) is completed for a predetermined time.

Through the above process (S100 ~ S900), the manufacturing process of the composite of the metal body and the resin as shown in Figure 3 is completed, and the composite of the metal body and the resin is completed with reference to Figures 3 to 4 Let's see.

The composite of the metal body and the resin includes a base layer 10 formed of a metal body to form a basic outline, and a resin layer 30 that is injection molded into plastic and bonded to at least one surface of the base layer 10. The porous film layer 40 having a plurality of pores 41 is formed between the base layer 10 and the resin layer 30, and the plastic is inserted into the pores 41 to form the base layer ( 10) and integrally combined.

Therefore, since the pores 41 are present innumerably in the base layer 10, the resin layer 30 is firmly attached to the base layer 10.

In addition, the porous film layer 40 in the portion where the resin layer 30 is not formed penetrates a dye having a predetermined color to induce aesthetics, thereby improving decorative properties, and the pores 41 in which the dye 42 penetrates are formed. It is blocked by the sealing material 44 to prevent discoloration or evaporation of the dye 42, so that it can be used almost semi permanently.

Such a composite of the metal body and the resin will be applicable to a variety of shapes depending on the product to be applied.

1 is a flowchart illustrating a method of manufacturing a composite of a metal body and a resin according to the spirit of the present invention in order.

Figure 2 is an enlarged perspective view of a portion of the porous coating layer of the main component of the present invention.

3 is a perspective view showing an embodiment according to the spirit of the present invention.

4 is an enlarged cross-sectional view of the II ′ of FIG. 3.

<Description of Symbols for Main Parts of Drawings>

10. Base layer 30. Resin layer

40. Porous coating layer 41. Pores

42. Dyes 44. Sealants

S100. Metal body shape processing step S200. Degreasing step

S300. Glossy polishing step S400. Dismat stage

S500. Anodization step S600. Drying stage

S700. Injection molding step S800. Coloring Step

S900. Sewing stage

Claims (7)

A shape processing step of processing the shape of the metal body forming the base layer; A degreasing step of removing the organic contaminants and the maintenance of the surface of the metal body in which the shape processing step is completed; Polishing polishing step of processing so that the surface of the metal body is completed the degreasing step is polished; A desmut step of removing a smut formed on the surface of the metal body in which the polishing step is completed; Anodizing to form a porous film layer having a plurality of pores on the surface of the metal body in which the disaste step is completed; A drying step of drying the metal body in which the anodization step is completed; An injection molding step of injection molding the plastic on at least one surface of at least one surface of the metal body in which the drying step is completed; A coloring step of adding color to the surface of the metal body in which the injection molding step is completed; Method for producing a composite of a metal body and a resin comprising a sealing step of sealing the pores of the porous coating layer of the metal body of the coloring step is completed. A shape processing step of processing the shape of the metal body forming the base layer; A degreasing step of removing the organic contaminants and the maintenance of the surface of the metal body in which the shape processing step is completed; Polishing polishing step of processing so that the surface of the metal body is completed the degreasing step is polished; A desmut step of removing a smut formed on the surface of the metal body in which the polishing step is completed; Anodizing to form a porous film layer having a plurality of pores on the surface of the metal body in which the disaste step is completed; A coloring step of adding color to the surface of the metal body in which the anodization step is completed; A drying step of drying the metal body in which the coloring step is completed; An injection molding step of injection molding the plastic on at least one surface of at least one surface of the metal body in which the drying step is completed; Method of manufacturing a composite of a metal body and a resin comprising a sealing step of sealing the pores of the porous film layer of the metal body of the injection molding step is completed. The method according to claim 1 or 2, In the injection molding step, the plastic is inserted into the pores is a composite manufacturing method of a metal body and a resin, characterized in that attached to the metal body integrally. The method according to claim 1 or 2, The metal body is aluminum (Al), magnesium (Mg), titanium (Ti), zinc (Zn), zirconium (Zr), hafnium (Hf), tantalum (Ta), niobium (pores are formed by anodization) Nb) any one of the composite material manufacturing method of the metal body and the resin. The method according to claim 1 or 2, The plastic is any one of polyphenylene sulfide (PPS), polystyrene (PS), polycarbonate (PC), polyester (PET), polyethylene (PE), polytetrafluoroethylene (PTFE) Method for producing a composite of resin with. The method according to claim 1 or 2, The drying step is a method for producing a composite of a metal body and a resin, characterized in that carried out at room temperature (Room Temperature). A base layer formed of a metal body to form a basic appearance; In the composite of a metal body and a resin which is injection molded into plastic and comprises a resin layer bonded to at least one surface of the base layer, A porous coating layer having a plurality of pores is formed between the base layer and the resin layer, wherein the resin layer is inserted into the pores and is integrally combined with the base layer.

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