TWI466612B - Housing and method for making the same - Google Patents

Description

Housing and preparation method thereof

The invention relates to a housing, in particular to a housing applied to a portable electronic device and a preparation method thereof.

With the rapid development of electronic products, the use of mobile electronic devices such as mobile phones, MP3 players, personal digital assistants, and notebook computers has become very common. With the evolution of personalization and fashion trends, the demand for portable electronic devices with metallic appearance surface decoration has gradually increased.

In order to enhance the metal effect of the surface of the portable electronic device, in recent years, the metal wire drawing process has been used in the industry to surface the surface of the metal casing of some portable electronic devices. The metal wire drawing process is a surface treatment process in which a sand or a grinding wheel is used to draw a regular or irregular stripe on the surface of the material to make the surface of the material have a strong metallic texture. The brushed metal shell has a beautiful appearance, strong metal texture, and the surface is not easy to leave fingerprints, oil stains, etc., so the added value of the product can be greatly increased. The traditional metal wire drawing process can only be applied to metal casings (such as aluminum alloy, stainless steel, etc.). However, the metal casing has higher processing cost and longer time than the plastic casing. If the plastic casing is directly drawn After processing, it cannot be rendered metallic.

In view of the above, it is necessary to provide a housing having a lower cost and having a metal wire drawing effect and a method of preparing the same.

A housing for a portable electronic device comprising a base made of plastic. The shell is further formed with a primer coating, a strengthening coating, a wire drawing layer, a metallic color coating and a transparent protective layer from the surface of the base shell, and the drawing layer is formed by drawing on the reinforcing coating.

A method for preparing a casing comprises the steps of: forming a plastic base shell; applying a primer to the base shell to form a primer coating; applying a reinforced paint to the primer coating to form a strengthening coating; and strengthening the coating The layer is drawn on the layer to form a wire drawing layer; the metallic layer coating is coated on the drawing layer to form a metallic color coating; and the transparent coating is coated on the metallic color coating to form a transparent protective layer.

The wire drawing layer of the casing is formed on the bearing layer, and is coated on the wire drawing layer to form a metallic color coating, and the outermost transparent protective layer can make the surface of the casing have a better metal wire drawing effect, and The base shell is made of plastic, so the cost of the metal shell relative to the surface is relatively low.

10‧‧‧shell

13‧‧‧bearing layer

134‧‧‧Strengthen coating

17‧‧‧Metal color coating

11‧‧‧ base shell

132‧‧‧ Primer coating

15‧‧‧ drawing layer

19‧‧‧Transparent protective layer

1 is a schematic cross-sectional view of a casing according to an embodiment of the present invention.

The housing of the present invention and its preparation method will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1, a housing 10 according to an embodiment of the present invention is shown, which includes a base housing 11. A carrier layer 13, a wire drawing layer 15, and gold are sequentially formed outward from the surface of the base shell 11. The color coating layer 17 and the transparent protective layer 19 are provided.

The base shell 11 is made of plastic. In the present embodiment, the material forming the base shell 11 is one of acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC) and polyphenylene sulfide (PPS). Or a combination thereof.

The carrier layer 13 serves to improve the flatness and hardness of the surface of the base shell 11. The carrier layer 13 is composed of a primer coating 132 and a reinforced coating 134.

A primer coating 132 is formed on the base shell 11 and mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The primer coating 132 is mainly used to shield the defects of the surface of the base shell 11 and to enhance the adhesion between the base shell 11 and the reinforcing coating 134. The primer coating 132 has a thickness of from 25 microns to 50 microns.

The strengthening coating 134 is formed on the primer coating 132, which mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The reinforcing coating 134 can further improve the smoothness and hardness of the surface of the base shell 11 and can serve as a carrier for the drawing layer 15. The thickness of the reinforced coating 134 is from 15 microns to 80 microns.

The wire drawing layer 15 is formed on the reinforcing coating 134.

The metallic color coating 17 is formed on the drawing layer 15 and mainly comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, a cupric oxide nanoparticle, an acrylate copolymer, a propylene glycol methyl ether acetate, and Butyl ester. The color of the metallic color coating 17 may be silver or gold, which may give the entire casing 10 a strong metallic feel. The metallic color coating 17 has a thickness of from 2 micrometers to 7 micrometers.

The transparent protective layer 19 is formed on the metallic color coat layer 17, and mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a ceria, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The transparent protective layer 19 is mainly used to protect the metallic color coating 17 from being worn, and also to improve the gloss of the surface of the casing 10. The transparent protective layer 19 has a thickness of from 20 micrometers to 80 micrometers.

The base shell 11 of the present invention as a main structural portion of the casing 10 is made of a plastic which is easy to mold and relatively inexpensive, and is costly lower than the metal casing. Since the casing 10 is drawn on the carrier layer 13 to form the wire drawing layer 15, even if the surface of the base shell 11 is exposed to defects (for example, pits, cracks, etc. formed during injection molding), it can be covered by the carrier layer 13, thereby It is easy to increase the uniformity of the drawing texture of the drawing layer 15 and the depth of the drawing texture, and to improve the appearance of the base shell 11. In addition, since the metallic color coating layer 17 is formed on the drawing layer 15, the casing 10 is made to have a relatively strong metallic texture, and the appearance of the base casing 11 is further improved.

It can be understood that if the smoothness and hardness of the base shell 11 are good, the reinforcing coating 134 can also be omitted. The draw layer 15 is now formed directly over the primer coating 132.

Further, if the surface defects of the base shell 11 are small and the adhesion to the reinforcing coating layer 134 is strong, the primer coating layer 13 may be omitted. At this time, the wire drawing layer 15 is directly formed on the reinforcing coating layer 134.

A method of preparing the above described housing 10 includes the following steps:

In step 1, a plastic base case 11 is formed. In the present embodiment, the base case 11 is formed by injection molding.

Step 2, forming a bearing including the primer layer 132 and the reinforcing layer 134 on the base shell 11 Layer 13. The carrier layer 13 can be formed by first applying a primer on the base shell 11 and curing to form a primer coating layer 132; wherein the primer mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, and carbon black. , acrylate copolymer, propylene glycol methyl ether acetate and butyl ester; coating method can be hand or spray; curing temperature is 50 degrees to 100 degrees, curing time is 10 minutes to 30 minutes. Next, the lacquer coating is applied to the primer coating 132 to form a reinforced coating 134; wherein the reinforced lacquer mainly comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, and a propylene glycol methyl ether. Acetate and butyl ester; the coating method can be hand-coated or sprayed; the curing temperature is 50 degrees to 100 degrees, and the curing time is 10 minutes to 30 minutes.

Step 3, drawing on the bearing layer 13 to form the drawing layer 15; wherein the drawing process may be performed by a cloth wheel or a belt drawing, preferably a cloth wheel drawing; and in order to improve the uniformity of the texture of the drawing layer 15, a plurality of times may be performed. Light brushed lines deepen the brushed lines.

Step 4, coating a metallic paint on the drawing layer 15 and curing to form a metallic coating 17; wherein the metallic coating mainly comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, and a cupric oxide nanoparticle. , acrylate copolymer, propylene glycol methyl ether acetate and butyl ester; coating method can be hand or spray; curing temperature is 50 degrees to 100 degrees, curing time is 10 minutes to 30 minutes.

Step 5, applying a transparent lacquer on the metallic color coating layer 17 to form a transparent protective layer 19; wherein the transparent lacquer may mainly comprise an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a cerium oxide, an acrylate copolymer. Propylene glycol Ether acetate and butyl ester; the coating method can be hand coating or spraying; curing temperature is 50 degrees to 100 degrees, and curing time is 10 minutes to 30 minutes.

It can be understood that if the smoothness and hardness of the base shell 11 are better, the process of applying the reinforced lacquer to form the reinforced coating layer 134 in the step 2 can be omitted. At this time, the carrier layer 13 is formed by curing the base shell 11 after applying the primer. .

In addition, if the surface defect of the base shell 11 is small and the adhesion to the strengthening coating layer 134 is strong, the process of applying the primer to form the primer coating layer 132 in step 2 may be omitted. The base shell 11 is coated with a reinforced paint and cured.

Embodiment 1:

Injection molding a base shell with ABS-containing plastic; coating a primer mainly containing acrylic resin, polyester resin, epoxy resin, amino resin, carbon black, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester on the base shell Baking at 50~100 °C for 10~30 minutes, curing to form a primer coating with a film thickness of 25~50 microns; using a cloth wheel to draw a plurality of times on the primer coating to form a wire drawing layer; Applying a metallic paint containing acrylic resin, polyester resin, epoxy resin, amino resin, pigment, aluminum oxide nanoparticles, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester on the drawing layer, 50~100 Baking at a temperature of °C for 10~30 minutes, curing to form a metallic coating with a thickness of 2~7 microns; and coating the metallic coating with acrylic resin, polyester resin, epoxy resin, amino resin, Transparent varnish of cerium oxide, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester, baked at 50~100 °C for 10~30 minutes, solidified to form transparent protective layer with film thickness of 20~80 microns, forming case.

Embodiment 2:

The base shell is injection molded from a plastic containing PC; and the reinforced paint mainly containing acrylic resin, polyester resin, epoxy resin, amino resin, pigment, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester is coated on the base shell. Baking at 50~100 °C for 10~30 minutes, curing to form a strengthening coating with a thickness of 25~50 microns; using a cloth wheel to perform multiple drawing on the reinforced coating to form a drawing layer; on the drawing layer Coating a metallic paint containing acrylic resin, polyester resin, epoxy resin, amino resin, pigment, aluminum oxide nanoparticles, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester at a temperature of 50 to 100 ° C Baking for 10~30 minutes, curing to form a metallic coating with a thickness of 2~7 microns; and coating the metallic coating with acrylic resin, polyester resin, epoxy resin, amino resin, cerium oxide, The transparent lacquer of acrylate copolymer, propylene glycol methyl ether acetate and butyl ester is baked at 50~100 °C for 10~30 minutes, and cured to form a transparent protective layer with a film thickness of 20-80 microns to form a shell.

Embodiment 3:

The base shell is injection molded with ABS+PC; the base shell is coated with acrylic resin, polyester resin, epoxy resin, amino resin, carbon black, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester. The primer is baked at a temperature of 50 to 100 ° C for 10 to 30 minutes to form a primer coating having a film thickness of 25 to 50 μm; the primer coating is mainly composed of an acrylic resin, a polyester resin, and a ring. Oxygen resin, amino resin, pigment, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester reinforced paint, baked at 50~100 °C for 10~30 minutes, solidified to form a film thickness of 25~50 microns Reinforced coating; on the reinforced coating The drawing is performed by using a cloth wheel to form a drawing layer; the drawing layer is coated with an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an aluminum oxide nanoparticle, an acrylate copolymer, and a propylene glycol methyl ether acetate. Metallic coating of ester and butyl ester, baked at 50~100 °C for 10~30 minutes, solidified to form a metallic coating with a thickness of 2~7 microns; and coated with metallic resin on the metallic coating , transparent resin of polyester resin, epoxy resin, amino resin, cerium oxide, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester, baked at 50~100 °C for 10~30 minutes, solidified A transparent protective layer having a film thickness of 20 to 80 μm forms a shell.

Adhesion, hardness, Solvent Resistance, and Norman Abrasion tests were performed on the shells formed by the above process. The adhesion of the shell measured by the Baige test is 4B~5B; the hardness of the shell measured by the pencil hardness tester under the test conditions of 9.8 Newtons and 45 degrees of pencils is 1H~ 2H; In the solvent wiping test, the shell was repeatedly wiped 50 times according to the ASTM D4752 standard, and the endurance rating of the shell was 4; in the Norman abrasion resistance test, the shell was applied with a weight of 175 g. The body is ground, the surface of the casing is not exposed to the substrate, and the coating does not fall off.

It can be seen that the above-mentioned shell has high strength, hardness and wear resistance in addition to the strong metal wire drawing effect, and the above-mentioned casing also maintains a high preparation yield during the preparation process.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and This can limit the scope of patent application in this case. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧shell

13‧‧‧bearing layer

134‧‧‧Strengthen coating

17‧‧‧Metal color coating

11‧‧‧ base shell

132‧‧‧ Primer coating

15‧‧‧ drawing layer

19‧‧‧Transparent protective layer

Claims (11)

A casing is applied to a portable electronic device, which comprises a base made of plastic, and the improvement is that the casing is sequentially formed with a primer coating, a strengthening coating and a wire drawing layer from the surface of the base shell. a metallic color coating and a transparent protective layer formed by drawing the wire on the reinforced coating. The casing of claim 1, wherein the primer coating comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. . The casing of claim 2, wherein the reinforced coating layer comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The casing of claim 1, wherein the carrier layer comprises a reinforced coating layer formed on the surface of the base shell, the reinforced coating layer comprising an acrylic resin, a polyester resin, an epoxy resin, an amino resin, and a pigment. , acrylate copolymer, propylene glycol methyl ether acetate and butyl ester. The casing according to claim 1, wherein the metallic coating comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an aluminum oxide nanoparticle, an acrylate copolymer, and a propylene glycol. Ether acetate and butyl ester. The casing according to claim 1, wherein the transparent protective layer comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a ceria, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. . A method for preparing a casing comprises the steps of: forming a plastic base shell; applying a primer to the base shell to form a primer coating; applying a reinforced paint to the primer coating to form a strengthening coating; The reinforced coating layer is drawn to form a wire drawing layer; a metallic color coating is coated on the wire drawing layer to form a metallic color coating layer; and the transparent lacquer is coated on the metallic color coating layer to form a transparent protective layer. The method for preparing a casing according to claim 7, wherein the primer comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, a propylene glycol methyl ether acetate, and a butyl group. ester. The method for preparing a casing according to claim 7, wherein the reinforced paint comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. . The method for preparing a casing according to claim 7, wherein the metallic paint comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, a cupric oxide nanoparticle, an acrylate copolymer. , propylene glycol methyl ether acetate and butyl ester. The method for preparing a casing according to the seventh aspect of the invention, wherein the transparent lacquer comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a cerium oxide, an acrylate copolymer, and a propylene glycol methyl ether acetate. And butyl ester.