CN110819973A - External surface spraying process of external LDS antenna and chemical polishing solution thereof - Google Patents
External surface spraying process of external LDS antenna and chemical polishing solution thereof Download PDFInfo
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- CN110819973A CN110819973A CN201911088605.XA CN201911088605A CN110819973A CN 110819973 A CN110819973 A CN 110819973A CN 201911088605 A CN201911088605 A CN 201911088605A CN 110819973 A CN110819973 A CN 110819973A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/2006—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30
- C23C18/2026—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30 by radiant energy
- C23C18/204—Radiation, e.g. UV, laser
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/2006—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30
- C23C18/2046—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30 by chemical pretreatment
- C23C18/2073—Multistep pretreatment
- C23C18/2086—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2451/00—Type of carrier, type of coating (Multilayers)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- Metallurgy (AREA)
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Abstract
The invention discloses an external surface spraying process of an external LDS antenna, which is characterized in that chemical polishing treatment is added after a thick copper deposition step in a chemical plating process flow, an antenna bracket is subjected to the thick copper deposition treatment to obtain a first copper layer in an antenna area, the antenna bracket subjected to the thick copper deposition treatment is placed in chemical polishing liquid to be subjected to chemical polishing, the thickness and the surface roughness of the first copper layer are reduced in a mode of slightly etching copper molecules by the chemical polishing liquid, the phenomenon of unevenness of the external surface is further reduced, and then the external surface is directly subjected to paint spraying treatment.
Description
Technical Field
The invention belongs to the field of manufacturing of LDS antennas, and particularly relates to an external surface spraying process of an external LDS antenna and chemical polishing solution used by the external surface spraying process.
Background
The LDS antenna technology, i.e., the laser direct structuring technology, is widely used in mobile phone antennas and automotive electronic circuits. The antenna is most common at present, and due to the aesthetic appearance, the antenna is arranged on the inner side instead of the appearance surface after laser activation on the surface of the plastic part.
However, as the antenna becomes more sensitive, the antenna needs to be designed on the appearance surface of the plastic part directly after laser activation, and because the plastic part surface needs to be plated with a metal layer (copper layer, nickel layer, gold layer) after laser activation, the whole thickness of the plated layer is 10 to 20 micrometers, and as the paint spraying (other surface coatings such as ink) is performed with equal proportion of paint coating, uneven step printing can be generated on the plated layer area after the paint spraying (other surface coatings such as ink) is performed, which greatly affects the appearance surface of the product, and limits the application of the LDS antenna on the appearance surface to a certain extent.
At present, in the field of laser-activated post-chemical plating of metal circuits/antennas on the surface of a plastic part, such as in the process of manufacturing a mobile phone antenna, the conventional chemical plating is to place the plastic part to be activated into a metal salt and a soluble reducing solution for metal redox reaction, and metal ions are subjected to reduction deposition on the activated surface of the part, so that metals such as copper, nickel and the like are deposited in an activated area to complete circuit wiring.
For the LDS antenna, it is necessary to make an appearance surface, and the current practice in the industry is to, after the chemical plating process is completed, first apply some paint (ink and other surface coatings) on the bottom and spray some paint (ink and other surface coatings) on the metal layer, then apply layer treatment to the paint (ink and other surface coatings) that is higher above the metal layer in a grinding/polishing manner, and then spray the paint (ink and other surface coatings) without the problem of uneven appearance, as shown in fig. 1, the grinding process flow of the external surface spraying process of the existing external LDS antenna is: chemical plating → spraying paint for three times firstly → spraying paint for the first time and mechanical polishing → spraying paint for the fourth time → polishing the painted surface for the second time → spraying the final finish paint. The disadvantages of this method are many processes, long process time, low yield and high cost.
Disclosure of Invention
The invention aims to provide an external surface spraying process of an external LDS antenna and a chemical polishing solution used by the external LDS antenna, and provides a process scheme which can meet the appearance requirement and effectively reduce the cost.
In order to solve the problems, the technical scheme of the invention is as follows:
the external surface spraying process of the external LDS antenna comprises the following steps of sequentially carrying out laser activation, chemical plating and paint spraying on an antenna support, wherein the chemical plating process flow comprises the following steps: oil removal, pretreatment, first washing, ultrasonic cleaning, acid cleaning, copper triggering, thick copper deposition, chemical polishing, second washing, palladium activation, third washing, chemical nickel plating, fourth washing and drying, wherein,
and placing the antenna support subjected to the thick copper deposition treatment in a chemical polishing solution for chemical polishing, and reducing the thickness and the surface roughness of the first copper layer to obtain a second copper layer, wherein the chemical polishing temperature is 20-35 ℃, and the chemical polishing time is 0.5-3 min.
Preferably, the temperature of the chemical polishing is 25 ℃, and the time of the chemical polishing is 2 min.
Preferably, the antenna support is subjected to a number of cycles from the thick copper deposition step to the chemical polishing step.
Preferably, the chemical polishing solution in the chemical polishing step comprises hydrogen peroxide, sulfuric acid and water, and the concentration ratio of the hydrogen peroxide to the sulfuric acid is as follows: the concentration of the hydrogen peroxide is 10-20%, and the concentration of the sulfuric acid is 0.15-0.35%.
Preferably, the thickness of the second copper layer is 5-9 μm, and the roughness of the second copper layer is 0.8-2 μm.
Preferably, the laser activation step further includes edging the boundary of the antenna area of the antenna support with green light or ultraviolet laser.
Preferably, the laser activating step further comprises processing a through hole in an antenna area of the antenna support with a green or ultraviolet laser.
Preferably, the painting specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: and spraying finish paint on the primer, wherein the thickness of the finish paint is 8-30 mu m.
Preferably, the primer thickness is 24 μm and the topcoat thickness is 20 μm.
Preferably, the painting specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m;
s3: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-35 mu m.
Preferably, the primer thickness is 24 μm, the midcoat thickness is 20 μm, and the UV paint thickness is 30 μm.
Preferably, the painting specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m;
s3: spraying PU paint on the intermediate paint, wherein the thickness of the PU paint is 25-35 mu m;
s4: spraying finish paint on the PU paint, wherein the thickness of the finish paint is 20-30 mu m;
s5: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-35 mu m.
Preferably, the thickness of the primer is 24 μm, the thickness of the middle paint is 20 μm, the thickness of the PU paint is 30 μm, the thickness of the finish paint is 24 μm, and the thickness of the UV paint is 30 μm.
Based on the same inventive concept, the invention also provides a chemical polishing solution for the external surface spraying process of the external LDS antenna, wherein the chemical polishing solution comprises the following components in percentage by concentration: the concentration of the hydrogen peroxide is 10-20%, the concentration of the sulfuric acid is 0.15-0.35%, and the balance is water.
Based on the same inventive concept, the invention also provides an external surface spraying process of the external LDS antenna, which comprises the steps of sequentially carrying out laser activation on the antenna support, and processing the through holes by using green light or ultraviolet laser in the laser activation step.
Preferably, the laser activation step further includes edging the boundary of the antenna area of the antenna support with green light or ultraviolet laser.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) the invention provides an external surface spraying process of an external LDS antenna, which is characterized in that chemical polishing treatment is added after a thick copper deposition step in a chemical plating process flow, an antenna bracket is subjected to the thick copper deposition treatment to obtain a first copper layer in an antenna area, the antenna bracket subjected to the thick copper deposition treatment is placed in chemical polishing liquid to be subjected to chemical polishing, the thickness and the surface roughness of the first copper layer are reduced in a mode of slightly etching copper molecules by the chemical polishing liquid, the phenomenon of unevenness of the external surface is further reduced, and then the external surface is directly subjected to paint spraying treatment.
2) The invention provides an external surface spraying process of an external LDS antenna, wherein the laser activation step further comprises the step of adopting green light or ultraviolet laser to perform edge folding on the boundary of an antenna area of an antenna support, compared with the existing infrared laser, the defect that the boundary of a chemical plating metal layer is not clear due to the defects of overheating and vibration tolerance of +/-0.08 of the infrared laser can cause the defect that the filling of subsequent paint at the boundary is not good, and the problem that the boundary of the metal layer is not clear can be favorably improved by adopting the green light or ultraviolet laser to perform edge folding on the boundary of the antenna area of the antenna support.
3) The invention provides an external surface spraying process of an external LDS antenna, wherein the laser activation step further comprises the step of processing a through hole in an antenna area of an antenna bracket by adopting green light or ultraviolet laser, compared with infrared laser, the green light/ultraviolet laser has short wavelength, large optical storage density and small aggregated light spot, so that the through hole with smaller diameter can be processed, and meanwhile, the phenomenon that the edge of the hole is rolled up too much due to overburning of materials is avoided because the heat affected area of the green light/ultraviolet laser is small, so that the defect of unevenness of the material can be shielded more easily by subsequent spraying.
Drawings
Fig. 1 is a schematic view of a polishing process flow of an external surface spraying process of an external LDS antenna provided in the prior art;
fig. 2 is a flowchart of an external surface spraying process of an external LDS antenna according to an embodiment of the present invention;
FIGS. 3a to 3b are diagrams illustrating the effect of the prior art after laser perforation and painting by infrared laser;
FIGS. 4a to 4b are diagrams illustrating the effect of the laser perforation using the green/UV laser according to the embodiment of the present invention;
FIGS. 5a to 5c are three specific process flow diagrams of the painting step of FIG. 2;
fig. 6a to 6b are diagrams illustrating the effect of the antenna after chemical plating and painting according to the first embodiment of the invention.
Detailed Description
The external surface spraying process of the external LDS antenna provided by the present invention is further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.
Referring to fig. 2, fig. 2 is a flowchart of an external surface spraying process of an external LDS antenna according to an embodiment of the present invention, the present invention provides an external surface spraying process of an external LDS antenna, which sequentially performs laser activation, chemical plating and paint spraying on an antenna support, wherein the chemical plating process includes: oil removal, pretreatment, first washing, ultrasonic cleaning, acid cleaning, copper triggering, thick copper deposition, chemical polishing, second washing, palladium activation, third washing, chemical nickel plating, fourth washing and drying; and adding chemical polishing treatment after the thick copper deposition step, obtaining a first copper layer after the antenna support is subjected to the thick copper deposition treatment, placing the antenna support subjected to the thick copper deposition treatment in chemical polishing liquid for chemical polishing, reducing the thickness and the surface roughness of the first copper layer, and obtaining a second copper layer, wherein the chemical polishing temperature is 20-35 ℃, and the chemical polishing time is 0.5-3 min.
For the laser activation step, the existing laser activation process is to firstly scan the internal antenna area by adopting infrared laser and then scan a circle of boundary line by adopting the infrared laser, because the infrared light has the defects of overheating and shaking tolerance of +/-0.08, the boundary of a chemical plating metal layer is not clear, further, in the subsequent paint spraying step, the defect that the paint spraying (other surface coatings such as ink and the like) is not well filled at the boundary can be caused, and the attractiveness of the outer surface is influenced. The principle is that the wavelength of red light is 650-660 nm, the wavelength of green light is 532nm, the wavelength of purple light is 355-405 nm, and the optical storage density is inversely proportional to the quadratic power of the optical wavelength, so that the shortening of the wavelength is an effective way for improving the optical storage density, and compared with infrared light, the green light/purple light adopted by the invention can greatly improve the optical storage density; the green/violet light is shorter than the red wavelength, and the energy carried by the light beam is ranked as: the purple light is more than the green light and more than the red light, so the green light/purple light has smaller heat affected area than the red light, the metal layer boundary is easy to be clearly realized, the paint is easy to be filled in the boundary when the paint is sprayed, the polishing process is not needed, and the phenomenon that the visible concave-convex printing is not generated in the boundary of the chemical coating area after the paint is sprayed can be realized.
Meanwhile, when the through hole with two-side conduction function is processed in the antenna area by using infrared laser in the prior art, due to the side effect of overheating of infrared light, the material is easy to be over-burnt and turned too much, so that the problems of overlarge diameter and flanging of the through hole occur, the diameter of the through hole obtained by using infrared laser processing in the prior art is over phi 0.16mm, so that the subsequent paint spraying (other surface coatings such as ink and the like) step cannot cover the flanging defect, and the attractiveness of the outer surface is affected, as shown in fig. 3a to 3b, fig. 3a to 3b are product effect diagrams after laser perforation by using infrared laser and paint spraying in the prior art, as can be seen from fig. 3a, the through hole has obvious flanging phenomenon after laser perforation by using infrared laser, and as shown in an arrow in the diagram, as shown in fig. 3b, the through hole is not level after paint spraying, in the invention, the boundary of the antenna area of the antenna bracket is trimmed by green light or ultraviolet laser, so that the problem of unclear boundary of the metal layer can be effectively solved, meanwhile, the invention processes the through hole with two-sided conduction function on the antenna area by green light or ultraviolet laser, the diameter of the obtained through hole can be reduced to about phi 0.12mm, the flanging problem of the circumferential edge of the through hole is also well improved, as shown in fig. 4a to 4b, fig. 4a to 4b are product effect diagrams of the embodiment of the invention, which are obtained by performing laser perforation by green light/ultraviolet laser, and as shown in fig. 4a, after performing laser perforation by green light/ultraviolet laser, the through hole is also obviously uneven, as shown in fig. 4a, but after painting, as shown in fig. 4b, no trace of the through-hole was visible after painting, as indicated by the arrow in fig. 4 b. Compared with infrared laser, the green light/ultraviolet laser has the advantages that the wavelength is short, the optical storage density is high, the gathered light spot is small, the through hole with the smaller diameter can be processed, meanwhile, due to the fact that the green light/ultraviolet laser heat affected area is small, the phenomenon that the material is over-burnt and the edge of the hole is turned over too much can not be caused, and the defect of unevenness can be easily shielded by subsequent paint spraying.
For the chemical plating step, the chemical plating step is a key step of the process, the thickness of a copper layer obtained after chemical plating in the prior art is too thick, the surface roughness is too high, the paint piling effect can be amplified by subsequent paint spraying (ink and other surface coatings) in the prior art, the phenomenon of surface unevenness is more obvious, and the attractiveness of the outer surface is seriously affected, so the prior art needs to add a polishing process with complex process to polish a surface convex part, and the process has the disadvantages of multiple processes, long process time, low yield and high cost. The invention improves on the basis of the existing chemical plating process flow, chemical polishing treatment is added after the thick copper deposition step, a first copper layer is obtained after the antenna bracket is subjected to the thick copper deposition treatment, the antenna bracket subjected to the thick copper deposition treatment is placed in chemical polishing liquid for chemical polishing, and the chemical polishing liquid comprises the following components in percentage by concentration: the concentration of the hydrogen peroxide is 10 to 20 percent, and the concentration of the sulfuric acid is 0.15 to 0.35 percent. The method comprises the steps of reducing the thickness and the surface roughness of a first copper layer by means of microetching copper molecules with chemical polishing liquid to obtain a second copper layer, wherein the thickness of the first copper layer without chemical polishing treatment is generally 12-20 microns, the roughness is 3.0-5 microns, the thickness of the second copper layer after chemical polishing treatment is 5-9 microns, the roughness is 0.8-2 microns, the chemical polishing temperature is 20-35 ℃, preferably 25 ℃, and the chemical polishing time is 0.5-3 min, preferably 2 min. Preferably, in order to improve the quality of a product, the antenna bracket can be circulated from a thick copper deposition step to a chemical polishing step for a plurality of times according to needs.
In the paint spraying step, the paint spraying step is to perform spray coating treatment on the outer surface of the antenna, and is of great importance to the attractiveness of the outer surface of the antenna, a paint (such as ink and other surface coatings) with excellent filling performance and leveling performance is selected, so that the paint accumulation effect at the corner of a coating is quickly compensated, no obvious concave-convex appearance is generated after the paint (such as ink and other surface coatings) is sprayed in a chemical coating area, and compared with the existing process scheme of additionally polishing the coating, the cost can be greatly reduced. Referring to fig. 5a to 5c, fig. 5a to 5c are three specific process flow charts of the painting step of fig. 2, and the present invention provides three specific painting processes according to the requirements of customers for the appearance and the cost.
The first specific process flow of the paint spraying step is as follows:
s1: spraying a primer on the outer surface of the antenna bracket, wherein the thickness of the primer is 8-30 microns, and preferably 24 microns;
s2: and spraying a finish paint on the primer, wherein the thickness of the finish paint is 8-30 mu m, and preferably 20 mu m.
The second specific process flow of the paint spraying step is as follows:
s1: spraying a primer on the outer surface of the antenna bracket, wherein the thickness of the primer is 8-30 microns, and preferably 24 microns;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m, and preferably 20 mu m;
s3: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-30 mu m, and preferably 30 mu m.
The third specific process flow of the paint spraying step is as follows:
s1: spraying a primer on the outer surface of the antenna bracket, wherein the thickness of the primer is 8-30 microns, and preferably 24 microns;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m, and preferably 20 mu m;
s3: spraying PU paint on the intermediate paint, wherein the thickness of the PU paint is 25-35 mu m, and preferably 30 mu m;
s4: spraying finish paint on the PU paint, wherein the thickness of the finish paint is 20-30 mu m, and the optimal thickness is 24 mu m;
s5: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-30 mu m, and preferably 30 mu m.
In the invention, the paint used in the paint spraying step comprises black and white, namely, the antenna bracket comprises black or white after the paint spraying is finished.
Example one
In this embodiment, taking the bluetooth antenna and the WIFI antenna for the moving earphone mirror as an example, the external surface spraying process of the external LDS antenna provided in this embodiment is used to process the bluetooth antenna support and the WIFI antenna support, and the steps are as follows:
the first step is as follows: the laser activation step, firstly scanning an internal antenna area by adopting infrared laser, then adopting green light or ultraviolet laser to carry out edge folding on the boundary of the antenna area of the antenna bracket, and processing a through hole with two-side conduction effect on the antenna area;
the second step is that: and a chemical plating step, sequentially carrying out oil removal, pretreatment, first water washing, ultrasonic cleaning, acid washing, copper triggering and second water washing, carrying out thick copper deposition on an antenna area, checking and confirming the thickness of a copper layer through a first piece, then controlling the thickness of copper to be 5-9 microns by using chemical polishing treatment, if the thickness of the copper layer is not within 5-9 microns, circulating the thick copper deposition to the chemical polishing step for multiple times until the thickness of copper is controlled to be within 5-9 microns, wherein in the embodiment, the thick copper deposition to the chemical polishing step is circulated once, the thickness of copper can be within a specified range, nickel plating is carried out again, the thickness of nickel is 1-3 microns, and gold plating is carried out for 0.05 microns.
The third step: a paint spraying step, in which the antenna bracket after the chemical plating step is subjected to oil and dust removal treatment, and then is sequentially subjected to primer spraying, paint spraying, PU paint spraying, finish paint spraying and UV paint spraying, wherein the used paint can be white paint and black paint, namely the finally-obtained antenna bracket has two colors of black and white for users to select, in the embodiment, the paint is black paint, the finally-obtained antenna bracket is black, and no visual concave-convex mark exists on the outer surface of the finally-obtained antenna, as shown in FIGS. 6a to 6b, FIGS. 6a to 6b are product effect diagrams after antenna chemical plating and paint spraying of the first embodiment of the invention, the area indicated by the arrow in FIG. 6a is an antenna chemical plating area and a through hole in the chemical plating area, FIG. 6b is a through hole which is shielded after paint spraying, and the concave-convex mark cannot be seen by naked eyes, as indicated by the arrow in the diagram, the beauty of the product is improved.
Example two
Based on the same inventive concept, the invention also provides a chemical polishing solution for the external surface spraying process of the external LDS antenna, which comprises the following components in percentage by concentration: the concentration of hydrogen peroxide is 10-20%, the concentration of sulfuric acid is 0.15-0.35%, and the rest is water. The chemical plating step of the external surface spraying process of the external LDS antenna comprises the steps of placing an antenna support into chemical polishing liquid for chemical polishing treatment, specifically, obtaining a first copper layer in an antenna area of the antenna support after the antenna support is subjected to thick copper deposition treatment, placing the antenna support subjected to the thick copper deposition treatment into the chemical polishing liquid for chemical polishing, reducing the thickness and the surface roughness of the first copper layer in a mode of slightly etching copper molecules by the chemical polishing liquid, further reducing the phenomenon of uneven outer surface, and then directly performing paint spraying treatment on the outer surface.
EXAMPLE III
Based on the same inventive concept, the invention also provides an external surface spraying process of the external LDS antenna, which comprises the step of processing the through hole by laser, and processing the through hole by using green light or ultraviolet laser. Compared with infrared laser, the green light/ultraviolet laser has the advantages that the wavelength is short, the optical storage density is high, the gathered light spot is small, the through hole with the smaller diameter can be processed, meanwhile, due to the fact that the green light/ultraviolet laser heat affected area is small, the phenomenon that the material is over-burnt and the edge of the hole is turned over too much can not be caused, and the defect of unevenness can be easily shielded by subsequent paint spraying. Preferably, the laser activation step further includes edge folding the boundary of the antenna area of the antenna support by using green light or ultraviolet laser, and compared with the existing infrared laser, the defect that the boundary of the chemical plating metal layer is not clear due to the defects of overheating and vibration tolerance of +/-0.08 of the infrared laser can cause poor filling of the subsequent paint spraying at the boundary, and the problem that the boundary of the metal layer is not clear can be improved by edge folding the boundary of the antenna area of the antenna support by using green light or ultraviolet laser.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (16)
1. The utility model provides an external surface spraying process of external LDS antenna, carries out laser activation, chemical plating and spray paint with the antenna boom in proper order, its characterized in that, the process flow of chemical plating includes: oil removal, pretreatment, first washing, ultrasonic cleaning, acid cleaning, copper triggering, thick copper deposition, chemical polishing, second washing, palladium activation, third washing, chemical nickel plating, fourth washing and drying, wherein,
and placing the antenna support subjected to the thick copper deposition treatment in a chemical polishing solution for chemical polishing, and reducing the thickness and the surface roughness of the first copper layer to obtain a second copper layer, wherein the chemical polishing temperature is 20-35 ℃, and the chemical polishing time is 0.5-3 min.
2. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the temperature of the chemical polishing is 25 ℃ and the time of the chemical polishing is 2 min.
3. The external surface spraying process of claim 1, wherein the antenna support is cycled from the thick copper deposition step to the chemical polishing step several times.
4. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the chemical polishing solution in the chemical polishing step comprises hydrogen peroxide, sulfuric acid and water, and the concentration ratio of the hydrogen peroxide to the sulfuric acid is as follows: the concentration of the hydrogen peroxide is 10-20%, and the concentration of the sulfuric acid is 0.15-0.35%.
5. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the thickness of the second copper layer is 5-9 μm, and the roughness of the second copper layer is 0.8-2 μm.
6. The external surface spraying process of claim 1, wherein the laser activation step further comprises edging the boundary of the antenna area of the antenna holder with green or ultraviolet laser.
7. The external surface spraying process of claim 1, wherein the laser activation step further comprises machining through holes in the antenna area of the antenna holder with a green or ultraviolet laser.
8. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the paint spraying specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: and spraying finish paint on the primer, wherein the thickness of the finish paint is 8-30 mu m.
9. The external surface spraying process of the external LDS antenna as recited in claim 8, wherein the primer thickness is 24 μm and the topcoat thickness is 20 μm.
10. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the paint spraying specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m;
s3: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-35 mu m.
11. The external surface spraying process of claim 10, wherein the primer thickness is 24 μm, the middle paint thickness is 20 μm, and the UV paint thickness is 30 μm.
12. The external surface spraying process of the external LDS antenna as recited in claim 1, wherein the paint spraying specifically comprises the following steps:
s1: spraying a primer on the outer surface of the antenna support, wherein the thickness of the primer is 8-30 mu m;
s2: spraying a middle paint on the primer, wherein the thickness of the middle paint is 8-30 mu m;
s3: spraying PU paint on the intermediate paint, wherein the thickness of the PU paint is 25-35 mu m;
s4: spraying finish paint on the PU paint, wherein the thickness of the finish paint is 20-30 mu m;
s5: and spraying UV paint on the finish paint, wherein the thickness of the UV paint is 10-35 mu m.
13. The external surface spraying process of the external LDS antenna as recited in claim 12, wherein the primer thickness is 24 μm, the middle paint thickness is 20 μm, the PU paint thickness is 30 μm, the top paint thickness is 24 μm, and the UV paint thickness is 30 μm.
14. The chemical polishing solution for the external surface spraying process of the external LDS antenna is characterized by comprising the following components in percentage by concentration: the concentration of the hydrogen peroxide is 10-20%, the concentration of the sulfuric acid is 0.15-0.35%, and the balance is water.
15. The external surface spraying process of the external LDS antenna comprises the step of sequentially carrying out laser activation on an antenna support, and is characterized in that in the step of laser activation, a through hole is processed by using green light or ultraviolet laser.
16. The external surface spraying process of the external LDS antenna as set forth in claim 15, comprising laser activating the antenna support in sequence, wherein said laser activating step further comprises edging the boundary of the antenna area of said antenna support with green or ultraviolet laser.
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| CN112474235A (en) * | 2020-11-11 | 2021-03-12 | 昆山丰景拓电子有限公司 | Method for improving flatness of device surface spray coating in LDS (laser direct structuring) process |
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| CN113774384A (en) * | 2021-09-15 | 2021-12-10 | 上海莘芝光电科技有限公司东莞分公司 | Scheme for reducing three-dimensional line spraying cost through laser etching and chemical polishing |
| CN114465008A (en) * | 2022-02-15 | 2022-05-10 | 武汉大学 | Method for manufacturing antenna |
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| CN113774384A (en) * | 2021-09-15 | 2021-12-10 | 上海莘芝光电科技有限公司东莞分公司 | Scheme for reducing three-dimensional line spraying cost through laser etching and chemical polishing |
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