CN102162575A - Metal and plastic joint structure and manufacturing method thereof - Google Patents

Abstract

The invention discloses a metal and plastic joint structure and a manufacturing method thereof. The plastic attaching parts are arranged on one surface of the metal substrate, and the surfaces of the metal substrate and the plastic attaching parts are covered by a protective film through a film covering process.

Description

Metal and plastic joint structure and manufacturing method thereof

technical field

The present invention relates to a metal-plastic bonding structure and a manufacturing method, in particular to a structure and a manufacturing method for covering a metal substrate and a plastic attachment with a protective film.

Background technique

With the progress of the times and the development of the economy, people's requirements for life are no longer just for food and clothing, but more importantly, the convenience and beauty of all things in life. It not only requires innovation and change, but also requires beauty and lightness. Therefore, in the era of advanced technology, more and more product casings combining plastic and metal have emerged as the times require.

The product casing combined with metal and plastic has the advantages of light weight of plastic products and high strength of metal products, and after surface processing, the changes in appearance are more diverse and more textured.

Surface processing is nothing more than chemical surface treatment, physical surface treatment or a combination of physical and chemical surface processing. Among them, the chemical surface treatment includes chemical evaporation, electrochemical treatment (electroplating and anode), chemical formation, chemical plating and chemical etching effects and all the processes mixed with each other; or the physical surface treatment includes thermal evaporation, sputtering, sandblasting, Electroshock and all its intermixed processes can make the appearance of the article more beautiful through the aforementioned surface processing process.

However, its disadvantage is that the defect rate of the product casing combined with metal and plastic after surface processing is relatively high, because the surface treatment process requires the product casing combined with metal and plastic to be immersed in chemicals or detergents to form a layer on the surface of the product. Finished surface. Therefore, during the surface treatment process, chemicals or detergents will penetrate into the joint between metal and plastic, weakening the joint strength between metal and plastic, and the plastic and metal are easy to separate. The chance of damage to the metal or plastic surface for surface construction, both will lead to an increase in the defective rate, which will increase the production cost of the manufacturer.

Contents of the invention

In view of the above-mentioned existing technical problems, one object of the present invention is to provide a metal-plastic joint structure and its manufacturing method, so as to solve the problems caused by the infiltration of chemical agents or detergents during the surface processing of the metal-plastic joint product casing. The bonding surface of metal and plastic weakens the bonding strength of metal and plastic, and the plastic and metal are easy to separate, and the probability of damage to the side that does not undergo surface processing increases, resulting in an increase in defective rate and an increase in the production cost of the manufacturer.

According to the object of the present invention, a metal-plastic bonding structure is provided, which includes a metal substrate, at least one plastic attachment and a protective film. One side of the metal substrate is provided with a plurality of holes, each plastic attachment part is respectively attached to one side of the metal substrate with the plurality of holes, and a protective film is covered on each plastic attachment part and the surface of the metal substrate.

Wherein, the protective film is formed by light curing paint, oxygen-loving curing paint, metal protective paint or AB glue.

In addition, the present invention further proposes a metal-plastic joint manufacturing method. This method uses a surface roughening method to form a plurality of holes on one side of a metal substrate, and then uses a plastic injection molding process to form a plurality of holes in the metal substrate. Molten plastic is injected on one side of the metal substrate, and the molten plastic penetrates into a plurality of holes on the metal substrate, and solidifies to form at least one plastic attachment part fixed on the metal substrate, and finally, on the side of the metal substrate with each plastic attachment part, coating is carried out The film process makes the metal substrate and each plastic attachment part covered with a protective film.

Wherein, the surface roughening method is acid treatment, and the metal substrate is etched by acid treatment, so that a plurality of uneven concave holes are formed on the surface of the metal substrate, and the diameter of each hole is 1-250 nm.

Among them, the coating process is one of soaking forming method, coating forming method or spraying forming method, and the protective film is one of photocurable coating, oxygen-loving curing coating, metal protective paint or AB glue.

Wherein, at least one surface treatment is performed on the other side of the metal substrate, and the surface treatment is chemical surface treatment, physical surface treatment or a combination of physical and chemical surface treatment.

To sum up, according to the metal-plastic joint structure and the manufacturing method thereof of the present invention, it may have one or more of the following advantages:

(1) In the metal-plastic joint structure and its manufacturing method, the protective film is used to process the surface without weakening the joint strength between the metal substrate and the plastic attachment, so that the plastic attachment is not easy to detach from the metal substrate, effectively reducing the defective rate , thereby reducing the production cost of the manufacturer.

(2) The metal-plastic joint structure and its manufacturing method can reduce the chance of damage to the metal or plastic surface without surface construction through the protective film, thereby effectively reducing the defective rate of production, thereby reducing the production cost of the manufacturer.

Description of drawings

Fig. 1 is the schematic diagram of metal and plastic joint structure of the present invention;

Fig. 2 is the flow chart of the manufacturing method of metal and plastic joint of the present invention;

Fig. 3 is the schematic diagram of the first embodiment of the present invention;

FIG. 4 is a schematic diagram of the coating of the metal shell according to the first embodiment of the present invention.

[Description of main component symbols]

10: metal substrate;

11: metal shell;

101: hole;

20: Plastic attachments;

21: convex post;

22: convex rib;

30: protective film;

41: rough surface;

411: joint surface;

42: Finished surface; and

S10-S12: steps.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1 , which is a schematic diagram of the metal-plastic joint structure of the present invention. The figure includes a metal substrate 10 , at least one plastic attachment 20 and a protective film 30 . One side of the metal substrate 10 has a plurality of holes 101, and the metal substrate 10 can be iron, iron alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium or titanium alloy, and each plastic attachment 20 is attached to the metal The substrate 10 has a plurality of holes 101 on one side, and the protective film 30 is covered on the surface of each plastic attachment 20 and the metal substrate 10, and the protective film 30 can be photocurable coating, oxygen-loving curing coating, metal protective paint or AB glue formed.

Each plastic attachment 20 can be polycarbonate resin (PC), polyethylene (PE), polyether ether copper (PEEK), polyoxymethylene resin/polyoxymethylene resin (POM), polypropylene resin (PP), polypropylene Tetrafluoroethylene (PTFE), polyurethane (PU), polyvinyl chloride (PVC), unsaturated polyester (UP), propylene-butadiene-styrene copolymer (ABS) or polycarbonate resin- Propylene-butadiene-styrene copolymer (PC-ABS) material.

Please refer to FIG. 2 , which is a flow chart of the manufacturing method of the metal-plastic joint of the present invention. The manufacturing method for metal-plastic bonding shown in the figure includes the following steps:

Step S10 is to form a plurality of holes on one side of the metal substrate by a surface roughening method. In this step, the surface roughening method referred to is acid treatment, and the metal substrate is etched by acid treatment to form unevenness on the surface of the metal substrate. A plurality of concave holes, and the diameter of each hole is 1-250nm.

In this step, the material of the metal substrate is iron, iron alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium or titanium alloy, but not limited thereto.

Step S11 is that after the metal substrate is etched by the surface roughening method, a plurality of holes are formed on the surface, and then the molten plastic is injected on the side of the metal substrate with the plurality of holes by the plastic injection molding process, and the molten plastic penetrates into the plurality of holes After curing, at least one plastic attachment part is formed and fixed on the metal substrate.

The molten plastic material used in this step can be polycarbonate resin (PC), polyethylene (PE), polyether ether copper (PEEK), polyoxymethylene resin/polyoxymethylene resin (POM), polypropylene resin (PP), polytetrafluoroethylene (PTFE), polyurethane (PU), polyvinyl chloride (PVC), unsaturated polyester (UP), propylene-butadiene-styrene copolymer (ABS) Or polycarbonate resin-propylene-butadiene-styrene copolymer (PC-ABS), but not limited thereto.

When the molten plastic is shot on the metal substrate, a part of the molten plastic will penetrate into the holes of the metal substrate. When the plastic solidifies, a plastic attachment is formed on the surface of the metal substrate, and the bottom surface of the plastic attachment is embedded in the metal. In the hole of the substrate, the plastic attachment is fixed on the metal substrate.

After the plastic attachments are fixed on the metal substrate, step S12 is performed on the side of the metal substrate with the plastic attachments, and the film coating process is performed on the metal substrate and each plastic attachment, so that the protective film covers the metal substrate and each plastic attachment. On the attachment part, a metal-plastic joint structure as shown in FIG. 1 is formed.

The coating process described in step S12 can be one of soaking forming method, coating forming method or spraying forming method, and the protective film covered by it is photocurable coating, oxygen-loving curing coating, metal protective paint or AB glue. one, but not limited to.

The side of the metal base plate with holes is provided with an injection-molded plastic attachment, and the other side is subjected to a surface treatment. This surface treatment can be chemical surface treatment, physical surface treatment or a combination of physical and chemical surface treatment process, and the chemical surface treatment referred to here includes chemical evaporation, electrochemical treatment (electroplating and anode), chemical formation, chemical Electroplating and chemical etching effects and all their intermixing processes, and physical surface treatments including thermal evaporation, sputtering, sandblasting, electroshock and all their intermixing processes.

According to a metal-plastic joint structure and its manufacturing method of the present invention, when surface processing is performed, the surface of the metal substrate 10 and the plastic attachment 20 is covered by the protective film 30, so that the chemical agents or detergents used for surface processing , will not infiltrate the joint surface of the metal substrate 10 and each plastic attachment 20 (that is, the hole of the metal substrate), so the bonding strength between the metal substrate 10 and each plastic attachment 20 will not be weakened, and further make each plastic attachment 20 not Comes off easily.

Furthermore, because the protective film 30 is covered on the metal substrate 10 and the plastic attachment 20, when one side of the metal substrate 10 is surface-processed, the protective film 30 can protect the other side of the metal substrate 10 (that is, no surface processing is performed). The surface of the metal substrate 10 and the plastic attachment 20), so that the plastic attachment 20 and the metal substrate 10 will not be damaged by the chemical agents for surface processing, so the defective rate of production can be effectively reduced, and the manufacturer can reduce production. Cost of production.

Please refer to FIG. 3 , which is a schematic diagram of the first embodiment of the present invention. The metal shell 11 is the shell of an electronic product. The inner surface of the metal shell 11 is a rough surface 41 , and the outer surface is a surface-processed surface 42 .

The roughened surface 41 of the metal shell 11 is subjected to acid treatment, so that a plurality of uneven concave holes 101 are formed by acid etching on the roughened surface 41, and the metal shell 11 after the acid treatment is injected with plastic on the roughened surface 41. The forming method provides a plurality of protrusions 21 including screw holes and at least one rib 22 . The plastic molding method is to inject molten plastic on the roughened surface 11, and part of the molten plastic penetrates into the hole 101. When the molten plastic solidifies to form the convex post 21 and the convex rib 22, the hole 101 of the joint surface 411 is covered by the convex post 21 or The bottoms of the ribs 22 are filled, so that the bottom surfaces of the bosses 21 and the ribs 22 fit into the holes of the roughened surface 41 , and the bosses 21 and the ribs 22 are closely connected with the roughened surface 41 of the metal shell 11 . Among them, the material of the convex column 21 and the convex rib 22 can be polycarbonate resin (PC), polyethylene (PE), polyether ether copper (PEEK), polyoxymethylene resin/polyoxymethylene resin (POM), polypropylene resin (PP), polytetrafluoroethylene (PTFE), polyurethane (PU), polyvinyl chloride (PVC), unsaturated polyester (UP), propylene-butadiene-styrene copolymer (ABS) Or polycarbonate resin-propylene-butadiene-styrene copolymer (PC-ABS).

Please refer to FIG. 4 , which is a schematic diagram of the metal shell coating according to the first embodiment of the present invention. When the protrusions 21 and the ribs 22 are fixed on the roughened surface 41 , further coating processing must be performed. The metal shell 11 with the protruding posts 21 and the protruding ribs 22 is coated with a spray forming method, so that the roughened surface 11 and the protruding ribs 21 and protruding posts 22 on the roughened surface 11 are coated with a layer of protective film 30, and protected The material of the film 30 can be one of light-curing paint, oxygen-loving curing paint, metal protective paint or AB glue. At this time, the surface of the convex post 21, the surface of the convex rib 22, and the roughened surface 11 are not filled by molten plastic The periphery of the hole 101 and the bonding surface 411 are also covered with the protective film 30 .

When the surface processing surface 42 of the metal shell 11 is intended to be surface processed (for example: electroplating), because the protective film 30 is covered on the surface of the protrusion 21, the surface of the convex rib 22, and the roughened surface 11, the gaps that are not filled by the molten plastic The peripheral edge of the hole 101 and the joint surface 411, the chemical agent (such as: electroplating solution) used in surface processing will only act on the surface processing surface 42, and will not penetrate into the joint surface 411, thereby ensuring that the protrusions 21 and ribs 22 The adhesion to the roughened surface 41 will not be reduced. Furthermore, the protrusions 21 , ribs 22 and the roughened surface 41 are not damaged by the electroplating solution due to the protective effect of the protective film 30 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (9)

1. A metal and plastic joint structure, characterized in that it comprises: A metal substrate, one side of which has a plurality of holes; at least one plastic attachment, respectively attached to one surface of the metal substrate having the plurality of holes; and A protective film is covered on the surface of the at least one plastic attachment and the metal substrate. 2 . The metal-plastic bonding structure according to claim 1 , wherein the other surface of the metal substrate is a surface treatment surface, and the surface treatment surface is formed through surface processing. 3 . 3. The metal-plastic bonding structure according to claim 1, wherein the protective film is formed by photocurable paint, oxygen-loving curable paint, metal protective paint or AB glue. 4. A method of manufacturing metal and plastic joints, comprising the following steps: forming a plurality of holes on one side of a metal substrate by a surface roughening method; Molten plastic is injected on the side of the metal substrate having a plurality of holes by a plastic injection molding process, and the plastic penetrates into the plurality of holes and solidifies to form at least one plastic attachment fixed on the metal substrate; as well as On one side of the metal substrate with each of the plastic attachments, a film coating process is performed to cover the metal substrate and each of the plastic attachments with a protective film. 5. The manufacturing method of metal and plastic joint as claimed in claim 4, characterized in that, the surface roughening method is an acid treatment, and the acid treatment etches the metal substrate so that the surface of the metal substrate is not formed. A plurality of flat and concave holes, the diameter of each hole is 1-250nm. 6 . The method for manufacturing metal-plastic joints according to claim 4 , wherein the coating process is one of immersion forming, coating forming or spray forming. 7 . 7. The method for manufacturing metal-plastic joints according to claim 4, wherein the protective film is one of photocurable paint, oxygen-loving curable paint, metal protective paint or AB glue. 8 . The method for manufacturing a metal-plastic joint as claimed in claim 4 , wherein at least one surface treatment is performed on the other surface of the metal substrate. 9 . The method for manufacturing a metal-plastic joint according to claim 8 , wherein the surface processing is a chemical surface treatment, a physical surface treatment, or a combination of physical and chemical surface processing.

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