阅读说明：本技术 一种塑料件表面金属化处理方法 (Surface metallization treatment method for plastic part ) 是由 徐雷 张凯 谭冠南 于 2020-04-27 设计创作，主要内容包括：本申请实施例示出了一种塑料件表面金属化处理方法,所述处理方法对塑料件表面中的复杂表面和简单表面区分处理,复杂表面采用化镀铜、化镀镍和化镀金的方式,简单表面采用选择性电镀方式,既能使塑料件表面金属化效果好,又能节约处理时间,降低生产成本。在处理方法中包括退化学镍处理,这样可以避免复杂表面被电镀,影响塑料件金属化效果。(The embodiment of the application shows a plastic part surface metallization processing method, the processing method is used for processing a complex surface and a simple surface in the surface of the plastic part, the complex surface adopts a copper plating, nickel plating and gold plating mode, and the simple surface adopts a selective electroplating mode, so that the plastic part surface metallization effect is good, the processing time is saved, and the production cost is reduced. The treatment method comprises chemical nickel stripping treatment, so that the complicated surface can be prevented from being electroplated to influence the metallization effect of the plastic part.)

1. A method for metallizing a surface of a plastic part, the method comprising:

roughening the surface of the plastic part;

cleaning the plastic piece after the roughening treatment, and then sequentially carrying out pretreatment of palladium precipitation and glue dissolution and nickel plating;

carrying out chemical nickel plating on the plastic piece subjected to nickel plating pretreatment;

dividing the surface of the nickel-plated plastic part into a complex surface and a simple surface, and performing laser etching on the complex surface;

the simple surface comprises a simple surface body and a blocking line, the blocking line is arranged on the periphery of the simple surface body, and laser etching is carried out on the simple surface body;

pre-plating copper on the complex surface subjected to laser etching and the simple surface subjected to laser etching of the simple surface body;

carrying out chemical nickel stripping treatment on the complex surface subjected to the copper pre-plating by adopting an etching process;

sequentially carrying out chemical copper plating, chemical nickel plating and chemical gold plating on the complex surface;

and selectively electroplating the simple surface, wherein the selective electroplating comprises copper electroplating and tin electroplating.

2. The method of claim 1, wherein the roughening comprises:

spraying carborundum on the surface of the plastic part by using sand blasting equipment, and carrying out mechanical coarsening.

3. The method of claim 1, wherein the thickness of the nickel layer of the plastic part subjected to nickel plating pretreatment is less than or equal to 1 um.

4. The method of claim 1 wherein the barrier strand has a width of at least 0.5 mm.

5. The method of claim 1, wherein the thickness of the copper layer pre-plated with copper is greater than or equal to 9 μm.

6. The method of claim 1, wherein the complex surface is sequentially plated with copper, nickel and gold, wherein the copper layer is 8-12um thick, the nickel layer is 3-6um thick, and the gold layer is 5-8um thick.

7. A method as claimed in claim 1, wherein the simple surface is sequentially electroplated with copper and tin, wherein the copper layer is 5-8um thick and the tin layer is 5-8um thick.

Technical Field

The invention relates to the technical field of plastic surface metallization, in particular to a plastic part surface metallization treatment method.

Background

With the continuous development of the Laser Direct Structuring (LDS) and the selective plating process, more and more plastics are applied in large scale in the fields of communication, automobiles, electronics, and the like, so that users can flexibly design complex plastic parts, and the laser direct structuring and the selective plating process are used for replacing the traditional processes of circuit board etching, metal sheet metal, die casting, and the like.

At present, the LDS can carry out metallization treatment on the surface of a plastic part with a complex shape, but the LDS has complex process, low production efficiency and high production cost. The selective electroplating technology is suitable for carrying out metal treatment on the surface of a plastic piece with a simple shape, the production period is shorter than that of the LDS, the production cost is lower than that of the LDS, but extra barrier lines are required to be added outside the routing lines of the selective electroplating, and therefore the surface of some complex plastic pieces is difficult to carry out metallization treatment.

Therefore, how to satisfy the requirement of rapid and low-cost treatment for the metallization of plastic parts with different designs is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a plastic part surface metallization treatment method, which aims to solve the problems of long cycle and high cost of the existing plastic part surface metallization.

The embodiment of the application discloses a plastic part surface metallization treatment method, which comprises the following steps:

roughening the surface of the plastic part;

cleaning the plastic piece after the roughening treatment, and then sequentially carrying out pretreatment of palladium precipitation and glue dissolution and nickel plating;

carrying out chemical nickel plating on the plastic piece subjected to nickel plating pretreatment;

dividing the surface of the nickel-plated plastic part into a complex surface and a simple surface, and performing laser etching on the complex surface;

the simple surface comprises a simple surface body and a blocking line, the blocking line is arranged on the periphery of the simple surface body, and laser etching is carried out on the simple surface body;

pre-plating copper on the complex surface subjected to laser etching and the simple surface subjected to laser etching of the simple surface body;

carrying out chemical nickel stripping treatment on the complex surface subjected to the copper pre-plating by adopting an etching process;

sequentially carrying out chemical copper plating, chemical nickel plating and chemical gold plating on the complex surface;

and selectively electroplating the simple surface, wherein the selective electroplating comprises copper electroplating and tin electroplating.

Further, the method for roughening the surface of the plastic part comprises the following steps:

spraying carborundum on the surface of the plastic part by using sand blasting equipment, and carrying out mechanical coarsening.

Furthermore, the thickness of the nickel layer of the plastic piece subjected to nickel plating pretreatment is less than or equal to 1 um.

Further, the width of the barrier line is at least 0.5 mm.

Further, the thickness of the copper layer of the pre-plated copper is more than or equal to 9 um.

Furthermore, the thickness of the copper layer in the process of carrying out chemical copper plating, chemical nickel plating and chemical gold plating on the complex surface is 8-12um, the thickness of the nickel layer is 3-6um, and the thickness of the gold layer is 5-8 um.

Furthermore, the thickness of the copper layer in the copper electroplating and the thickness of the tin electroplating are 5-8um and 5-8um respectively on the simple surface.

According to the technical scheme, the embodiment of the application shows the plastic part surface metallization treatment method, the treatment method is used for treating the complex surface and the simple surface in the surface of the plastic part, the complex surface adopts the modes of chemical copper plating, chemical nickel plating and chemical gold plating, and the simple surface adopts the selective electroplating mode, so that the plastic part surface metallization effect is good, the treatment time is saved, and the production cost is reduced. The treatment method comprises chemical nickel stripping treatment, so that the complicated surface can be prevented from being electroplated to influence the metallization effect of the plastic part.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for metallizing a surface of a plastic part according to an embodiment of the present disclosure.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The existing LDS process and selective electroplating technology have certain limitation on the treatment of plastic surface metallization. The LDS process has long processing time and high processing cost; the selective plating process does not allow for the processing of complex shapes.

Referring to fig. 1, an embodiment of the present application illustrates a method for metallizing a surface of a plastic part, the method comprising:

step S101, roughening the surface of the plastic part;

the plastic part is formed by injection molding process by adopting enhanced polyphenylene sulfide containing metal ions, and the finished plastic part prepared by adopting the enhanced polyphenylene sulfide has high yield, stable injection molding and difficult occurrence of injection molding defects such as material shortage. The reinforced polyphenylene sulfide also comprises polyphenylene sulfide and 30% by volume of glass fiber. The enhanced polyphenylene sulfide is a product of Sabic company with a material number of ER 008655.

Further, the method for roughening the surface of the plastic part comprises the following steps: spraying carborundum on the surface of the plastic part by using sand blasting equipment, and carrying out mechanical coarsening.

Specifically, the surface of the plastic part is subjected to mechanical roughening treatment by using 60-80-mesh carborundum, so that the surface roughness of the plastic part is increased, the surface roughness of the plastic part meets the use requirement by adjusting the parameters such as the jet speed, the air pressure and the like of sand blasting equipment, the adhesive force of a subsequent plating layer is improved, and the adverse phenomena such as peeling and falling of the plating layer are prevented.

Step S102, cleaning the plastic piece after the roughening treatment, and then sequentially carrying out pretreatment of palladium deposition, glue dissolution and nickel plating;

specifically, the plastic part after the roughening treatment is cleaned by ultrasonic waves to remove impurities remained on the surface.

The palladium deposition and dispergation can adsorb metal palladium on the surface of the plastic part, so that selective electroplating in subsequent steps is facilitated.

The technology for performing nickel plating pretreatment on a plastic piece is the prior art, and the nickel plating pretreatment comprises the steps of oil removal, acid cleaning, cleaning and the like.

Step S103, carrying out chemical nickel plating on the plastic piece subjected to nickel plating pretreatment;

specifically, the plastic part is plated with nickel, so that a selective electroplating process in subsequent steps is facilitated.

Furthermore, the thickness of the nickel layer of the plastic piece subjected to nickel plating pretreatment is less than or equal to 1 um.

Step S104, dividing the surface of the nickel-plated plastic part into a complex surface and a simple surface; performing laser etching on the complex surface;

because of the wide application of plastic parts, it is necessary to metallize plastic parts of different shapes. The working of plastics surface that this application embodiment will change nickel plating is divided into complex surface and simple surface, complex surface is regional for having many times curved surface or narrow and small plane, because simple surface adopts the selective plating mode, so need leave the barrier line, if the regional area in plane does not allow to set up the barrier line, then the regional narrow and small plane region of deeming that is of plane.

Specifically, laser is performed on the complex surface, so that metal particles in a required wiring area can be activated, and the wiring area is the position of the plastic part metallization.

S105, enabling the simple surface to comprise a simple surface body and a blocking line, wherein the blocking line is arranged on the periphery of the simple surface body, and performing laser etching on the simple surface body;

the barrier line divides the surface of the plastic part into an electroplating area and an non-electroplating area, the complex surface is the non-electroplating area, and the simple surface body is the electroplating area.

In practical application, the laser etching is carried out on the simple surface body, and the barrier line is reserved on the periphery of the simple surface body.

Further, the width of the barrier line is at least 0.5 mm.

S106, pre-plating copper on the complex surface subjected to laser etching and the simple surface subjected to laser etching of the simple surface body;

the pre-copper plating process can ensure that the tin layer adhesive force of the electroplated tin is better in the subsequent selective electroplating of the simple surface.

Further, the thickness of the copper layer of the pre-plated copper is more than or equal to 9 um.

Step S107, carrying out chemical nickel removing treatment on the complex surface subjected to the pre-copper plating by adopting an etching process;

since the surface of the structure with the nickel layer is electroplated, the nickel layer of the non-electroplating area is removed, and the non-electroplating area can be prevented from being electroplated.

Step S108, sequentially carrying out chemical copper plating, chemical nickel plating and chemical gold plating on the complex surface;

furthermore, the thickness of the copper layer in the process of carrying out chemical copper plating, chemical nickel plating and chemical gold plating on the complex surface is 8-12um, the thickness of the nickel layer is 3-6um, and the thickness of the gold layer is 5-8 um.

And step S109, carrying out selective electroplating on the simple surface, wherein the selective electroplating comprises copper electroplating and tin electroplating.

The electrolytic tin plating is to improve convenience of soldering.

Furthermore, the thickness of the copper layer in the copper electroplating and the thickness of the tin electroplating are 5-8um and 5-8um respectively on the simple surface.

The embodiment of the application avoids the defect of using an LDS process or a selective plating process independently, divides the surface of the plastic part into a simple surface and a complex surface, respectively utilizes corresponding metallization treatment processes for the simple surface and the complex surface, shortens the processing time, reduces the processing cost, solves the problem that the complex surface cannot be processed by using the selective plating process independently, and has wide application prospect.

According to the technical scheme, the embodiment of the application shows the plastic part surface metallization treatment method, the treatment method is used for treating the complex surface and the simple surface in the surface of the plastic part, the complex surface adopts the modes of chemical copper plating, chemical nickel plating and chemical gold plating, and the simple surface adopts the selective electroplating mode, so that the plastic part surface metallization effect is good, the treatment time is saved, and the production cost is reduced. The treatment method comprises chemical nickel stripping treatment, so that the complicated surface can be prevented from being electroplated to influence the metallization effect of the plastic part.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise procedures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.