Protection treatment method of PCB (Printed Circuit Board)

Abstract

The invention discloses a protection processing method for a PCB. The protection processing method comprises the steps that the surface of the PCB to be processed is cleaned; coating a layer of primer on the surface of the cleaned PCB to form a primer layer; coating the surface of the primer layer with an anti-oxidation coating prepared in advance to form a protective layer; and carrying out drying treatment on the protection layer to obtain the anti-oxidation PCB. By adopting the technical scheme of the invention, the PCB can be effectively prevented from being oxidized and damaged in bad environments such as humid, high-temperature and high-humidity environments, so that the working stability and reliability of the PCB are improved, and the service life of the PCB is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic manufacturing, and in particular to a protective processing method for a PCB board. Background Art

[0002] Printed circuit boards (PCBs) are one of the most important basic materials in the electronic manufacturing process, and their performance has a crucial impact on the quality and reliability of the entire circuit board. During the manufacturing, storage, and transportation of PCBs, PCBs are often exposed to adverse environments such as moisture, high temperature, and high humidity, which can cause oxidation and corrosion on the surface and inside of the PCBs, thus affecting the working stability, reliability, and service life of the PCBs. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a protective treatment method for a PCB board, which can effectively prevent the PCB board from being damaged by oxidation in adverse environments such as moisture, high temperature, and high humidity, thereby improving the working stability, reliability, and service life of the PCB board.

[0004] In order to achieve the above object, an embodiment of the present invention provides a protection treatment method for a PCB board, comprising:

[0005] Clean the surface of the PCB to be processed;

[0006] Applying a layer of primer on the surface of the cleaned PCB board to form a primer layer;

[0007] Applying a pre-prepared anti-oxidation coating on the surface of the primer layer to form a protective layer;

[0008] The protective layer is dried to obtain an anti-oxidation PCB board.

[0009] Furthermore, the primer is an alkyd resin primer, and the thickness of the primer layer is 20 to 30 μm.

[0010] Furthermore, the anti-oxidation coating is a polyurethane anti-oxidation coating, and the thickness of the protective layer is greater than or equal to 50 μm.

[0011] Furthermore, the preparation steps of the polyurethane anti-oxidation coating include:

[0012] An antioxidant is added into polyvinyl alcohol ester to react and generate the polyurethane antioxidant coating.

[0013] Furthermore, the reaction temperature is 60-100° C., and the reaction time is 2-4 hours.

[0014] Furthermore, the method further comprises:

[0015] Reflective material is added on the surface of the protective layer.

[0016] Furthermore, the method further comprises:

[0017] When it is necessary to remove the protective layer on the surface of the anti-oxidation PCB board, spraying a solvent on the surface of the protective layer;

[0018] Use plastic film to seal the surface of the protective layer after the solvent is sprayed, and keep it for 15 to 30 minutes;

[0019] The plastic film is removed to remove the solvent and the protective layer on the surface of the anti-oxidation PCB board;

[0020] Use clean water and neutral detergent to clean the surface of the treated anti-oxidation PCB board.

[0021] Furthermore, the solvent is methanol, ethanol or acetone.

[0022] Furthermore, the method further comprises:

[0023] When it is necessary to remove the primer layer on the surface of the anti-oxidation PCB board, a cleaning agent is added into a cleaning tank of a cleaning device according to a preset ratio to prepare a cleaning solution;

[0024] Placing the anti-oxidation PCB board in the cleaning liquid, cleaning the primer layer on the surface of the anti-oxidation PCB board, and controlling the temperature of the cleaning liquid to be a preset temperature and the cleaning time to be a preset time;

[0025] The cleaning liquid on the surface of the cleaned anti-oxidation PCB board is neutralized.

[0026] Furthermore, the cleaning agent is an acidic cleaning agent, an alkaline cleaning agent or a neutral cleaning agent.

[0027] Compared with the prior art, the embodiment of the present invention provides a protective treatment method for a PCB board. First, the surface of the PCB board to be treated is cleaned; then, a layer of primer is applied on the surface of the cleaned PCB board to form a primer layer; then, a pre-prepared antioxidant coating is applied on the surface of the primer layer to form a protective layer; finally, the protective layer is dried to obtain an antioxidant PCB board. The embodiment of the present invention forms a protective layer by coating an antioxidant coating on the surface of the PCB board, which can effectively prevent the PCB board from being damaged by oxidation in adverse environments such as moisture, high temperature, and high humidity, thereby improving the working stability, reliability, and service life of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a flow chart of a preferred embodiment of a protection treatment method for a PCB board provided by the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this technical field without creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present invention provides a protection treatment method for a PCB board. Figure 1 FIG. 1 is a flow chart of a preferred embodiment of a PCB protection treatment method provided by the present invention, wherein the method comprises steps S11 to S14:

[0031] Step S11, cleaning the surface of the PCB board to be processed;

[0032] Step S12, coating a layer of primer on the surface of the cleaned PCB board to form a primer layer;

[0033] Step S13, coating the pre-prepared anti-oxidation coating on the surface of the primer layer to form a protective layer;

[0034] Step S14: drying the protective layer to obtain an anti-oxidation PCB board.

[0035] In the specific implementation, first, prepare the PCB board to be processed, and clean the surface of the PCB board to remove the oil and impurities on the surface of the PCB board; then, apply a layer of primer containing a strong adhesive on the surface of the PCB board after the cleaning process to form a primer layer on the surface of the PCB board to enhance the adhesion between the substrate and the protective layer of the PCB board; then, use a method such as spraying, dipping or rolling to apply a pre-prepared special antioxidant coating on the surface of the primer layer to form a protective layer on the surface of the primer layer, which is equivalent to an antioxidant coating; finally, place the protective layer at room temperature and dry the protective layer so that it can firmly adhere to the surface of the PCB board to form an effective protective layer, and accordingly obtain an antioxidant PCB board.

[0036] It should be noted that in the process of coating the anti-oxidation coating on the surface of the primer layer, care should be taken to avoid defects such as spots and fish eyes, so as not to affect the anti-oxidation effect of the protective layer.

[0037] In one of the optional embodiments, the primer is an alkyd resin primer, and the thickness of the primer layer is 20 to 30 μm.

[0038] Specifically, in combination with the above embodiment, when the primer is applied on the surface of the PCB board, the primer used is an alkyd resin primer, and the thickness of the primer layer formed on the surface of the PCB board is in the range of 20 μm to 30 μm.

[0039] Exemplarily, the thickness of the primer layer can be 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm or 30 μm, and can also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0040] In one of the optional embodiments, the anti-oxidation coating is a polyurethane anti-oxidation coating, and the thickness of the protective layer is greater than or equal to 50 μm.

[0041] Specifically, in combination with the above embodiment, when the anti-oxidation coating is coated on the surface of the primer layer, the anti-oxidation coating used is a polyurethane anti-oxidation coating, and the thickness of the protective layer formed on the surface of the primer layer is not less than 50 μm.

[0042] It should be noted that in the embodiment of the present invention, the primer is an alkyd resin primer and the antioxidant coating is a polyurethane antioxidant coating. One of the reasons is that the alkyd resin primer and the polyurethane antioxidant coating are very compatible primers, which can further increase the adhesion of the protective layer on the surface of the PCB board and effectively prevent the protective layer from falling off.

[0043] In one of the optional embodiments, the preparation steps of the polyurethane anti-oxidation coating include:

[0044] An antioxidant is added into polyvinyl alcohol ester to react and generate the polyurethane antioxidant coating.

[0045] Specifically, in combination with the above embodiments, when preparing the polyurethane antioxidant coating in advance, the present invention can select polyvinyl alcohol ester, add antioxidant AO (for example, butylthio-β-naphthol, p-hydroxystyrene, etc.) into the polyvinyl alcohol ester for reaction, and generate a polyurethane antioxidant coating with excellent antioxidant properties and high durability.

[0046] In one of the optional embodiments, the reaction temperature is 60-100° C., and the reaction time is 2-4 hours.

[0047] Specifically, in combination with the above embodiments, when the polyurethane anti-oxidation coating is generated by the reaction of polyvinyl alcohol ester and an antioxidant, the required reaction temperature is in the range of 60° C. to 100° C., and the reaction time is in the range of 2 hours to 4 hours.

[0048] Exemplarily, the reaction temperature may be 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C or 100°C, and may also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0049] Exemplarily, the reaction time can be 2 hours, 2 hours and 10 minutes, 2 hours and 20 minutes, 2 hours and 30 minutes, 2 hours and 40 minutes, 2 hours and 50 minutes, 3 hours, 3 hours and 10 minutes, 3 hours and 20 minutes, 3 hours and 30 minutes, 3 hours and 40 minutes, 3 hours and 50 minutes or 4 hours, and can also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0050] In one of the optional embodiments, the method further includes:

[0051] Reflective material is added on the surface of the protective layer.

[0052] Specifically, in combination with the above embodiment, after forming a protective layer on the surface of the primer layer, a reflective material may be appropriately added to the surface of the protective layer to protect the PCB board and prevent its surface from being damaged by ultraviolet rays.

[0053] In one of the optional embodiments, the method further includes:

[0054] When it is necessary to remove the protective layer on the surface of the anti-oxidation PCB board, spraying a solvent on the surface of the protective layer;

[0055] Use plastic film to seal the surface of the protective layer after the solvent is sprayed, and keep it for 15 to 30 minutes;

[0056] The plastic film is removed to remove the solvent and the protective layer on the surface of the anti-oxidation PCB board;

[0057] Use clean water and neutral detergent to clean the surface of the treated anti-oxidation PCB board.

[0058] Specifically, in combination with the above embodiments, when it is necessary to remove the protective layer on the surface of the anti-oxidation PCB board, a certain amount of solvent can be sprayed on the surface of the protective layer first, and then a plastic film is used to seal the surface of the protective layer after the solvent is sprayed, and the surface is kept for about 15 minutes to 30 minutes. Then, the plastic film is removed, and the solvent on the surface of the protective layer and the protective layer itself are sucked away by a high-pressure air intake machine to remove the solvent and the protective layer on the surface of the anti-oxidation PCB board. Finally, clean water and a neutral detergent are used to clean the surface of the anti-oxidation PCB board after the solvent and the protective layer are removed to remove the residual solvent and the protective layer.

[0059] Exemplarily, the sealing treatment time can be 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes, 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes or 30 minutes, and can also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0060] It should be noted that, in the embodiment of the present invention, the anti-oxidation coating is a polyurethane anti-oxidation coating. One of the reasons is that the polyurethane anti-oxidation coating is easy to be removed.

[0061] In one optional embodiment, the solvent is methanol, ethanol or acetone.

[0062] Specifically, in combination with the above embodiment, when the solvent is sprayed on the surface of the protective layer, the solvent used may be methanol, ethanol or acetone.

[0063] In one of the optional embodiments, the method further includes:

[0064] When it is necessary to remove the primer layer on the surface of the anti-oxidation PCB board, a cleaning agent is added into a cleaning tank of a cleaning device according to a preset ratio to prepare a cleaning solution;

[0065] Placing the anti-oxidation PCB board in the cleaning liquid, cleaning the primer layer on the surface of the anti-oxidation PCB board, and controlling the temperature of the cleaning liquid to be a preset temperature and the cleaning time to be a preset time;

[0066] The cleaning liquid on the surface of the cleaned anti-oxidation PCB board is neutralized.

[0067] Specifically, in combination with the above embodiments, when it is necessary to remove the primer layer on the surface of the anti-oxidation PCB board, the cleaning agent can be first added to the cleaning tank of the cleaning equipment according to a preset ratio to prepare a cleaning solution, and then the anti-oxidation PCB board is placed in the cleaning solution to clean the primer layer on the surface of the anti-oxidation PCB board. In addition, during the cleaning process, it is necessary to pay attention to controlling the concentration, temperature and cleaning time of the cleaning solution. For example, the concentration of the cleaning solution can be controlled by a preset ratio when preparing the cleaning solution, the temperature of the cleaning solution can be controlled by a preset temperature, and the cleaning control can be controlled by a preset time to avoid damaging the surface of the primer layer. Finally, the cleaning solution on the surface of the anti-oxidation PCB board after the cleaning treatment is neutralized to neutralize the cleaning solution to avoid leaving residues and affecting the subsequent coating process.

[0068] It should be noted that in the embodiment of the present invention, the primer is an alkyd resin primer. One of the reasons is that the alkyd resin primer is very easy to clean.

[0069] In one of the optional embodiments, the cleaning agent is an acidic cleaning agent, an alkaline cleaning agent or a neutral cleaning agent.

[0070] Specifically, in combination with the above embodiments, when preparing the cleaning solution, the cleaning agent used can be an acidic cleaning agent, an alkaline cleaning agent or a neutral cleaning agent. It can be understood that the selection of the cleaning agent is mainly based on a comprehensive consideration of factors such as the required cleaning effect, primer characteristics and impact on the environment.

[0071] In combination with all the above embodiments, the implementation process of the present scheme is described below through the first specific embodiment, including: (1) selecting polyvinyl alcohol ester, adding antioxidant AO (for example, butylthio-β-naphthol, p-hydroxystyrene, etc.) into the polyvinyl alcohol ester for reaction, the reaction temperature is 60° C., the reaction time is 2 hours, and a polyurethane antioxidant coating with excellent antioxidant performance and high durability is generated; (2) preparing a PCB board and cleaning the surface of the PCB board to remove oil and impurities on the surface of the PCB board; (3) coating a layer of alkyd resin primer containing a strong adhesion agent on the surface of the cleaned PCB board, and forming a polyurethane anti-oxidation coating on the surface of the PCB board. (4) a special polyurethane anti-oxidation coating is applied on the surface of the primer layer by spraying, dipping or rolling to form a protective layer with a thickness of 50 μm, and it is important to avoid defects such as spots and fish eyes. In addition, reflective materials can be appropriately added to the surface of the protective layer to protect the PCB and prevent its surface from being damaged by ultraviolet rays. (5) the protective layer is placed at room temperature and dried to enable it to firmly adhere to the surface of the PCB to form an effective protective layer, thereby obtaining an anti-oxidation PCB.

[0072] In combination with all the above embodiments, the implementation process of the present solution is described below through a second specific embodiment, including: (1) selecting polyvinyl alcohol ester, adding an antioxidant AO (for example, butylthio-β-naphthol, p-hydroxystyrene, etc.) into the polyvinyl alcohol ester for reaction, the reaction temperature is 80° C., the reaction time is 3 hours, and a polyurethane antioxidant coating with excellent antioxidant performance and high durability is generated; (2) preparing a PCB board and cleaning the surface of the PCB board to remove oil and impurities on the surface of the PCB board; (3) coating a layer of alkyd resin primer containing a strong adhesion agent on the surface of the cleaned PCB board, and forming a polyurethane anti-oxidation coating on the surface of the PCB board. (4) a special polyurethane anti-oxidation coating is applied on the surface of the primer layer by spraying, dipping or rolling to form a protective layer with a thickness of 60 μm, and it is important to avoid defects such as spots and fish eyes. In addition, reflective materials can be appropriately added to the surface of the protective layer to protect the PCB board from being damaged by ultraviolet rays. (5) the protective layer is placed at room temperature and dried to enable it to be firmly attached to the surface of the PCB board to form an effective protective layer, thereby obtaining an anti-oxidation PCB board.

[0073] In combination with all the above embodiments, the implementation process of the present solution is described below through a third specific embodiment, including: (1) selecting polyvinyl alcohol ester, adding an antioxidant AO (for example, butylthio-β-naphthol, p-hydroxystyrene, etc.) into the polyvinyl alcohol ester for reaction, the reaction temperature is 100° C., the reaction time is 4 hours, and a polyurethane antioxidant coating with excellent antioxidant performance and high durability is generated; (2) preparing a PCB board and cleaning the surface of the PCB board to remove oil and impurities on the surface of the PCB board; (3) coating a layer of alkyd resin primer containing a strong adhesion agent on the surface of the cleaned PCB board, and A primer layer with a thickness of 30 μm is formed to enhance the adhesion between the substrate and the protective layer of the PCB board; (4) A special polyurethane antioxidant coating is applied to the surface of the primer layer by spraying, dipping or rolling, and a protective layer with a thickness of 70 μm is formed on the surface of the primer layer, and care is taken to avoid defects such as spots and fish eyes; in addition, reflective materials can be appropriately added to the surface of the protective layer to protect the PCB board and prevent its surface from being damaged by ultraviolet rays; (5) The protective layer is placed at room temperature and dried so that it can be firmly attached to the surface of the PCB board to form an effective protective layer, and an antioxidant PCB board is obtained accordingly.

[0074] In summary, the protective treatment method of a PCB board provided by the embodiment of the present invention firstly cleans the surface of the PCB board to be treated; then, a layer of primer is applied on the surface of the cleaned PCB board to form a primer layer; then, a pre-prepared antioxidant coating is applied on the surface of the primer layer to form a protective layer; finally, the protective layer is dried to obtain an antioxidant PCB board. The embodiment of the present invention forms a protective layer by coating an antioxidant coating on the surface of the PCB board, which can effectively prevent the PCB board from being damaged by oxidation in adverse environments such as moisture, high temperature, and high humidity, thereby improving the working stability, reliability, and service life of the PCB board, and at the same time, can also ensure the safety and stability of the entire treatment process.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A protective treatment method for a PCB board, It is characterized in that include: Clean the surface of the PCB to be processed; Applying a layer of primer on the surface of the cleaned PCB board to form a primer layer; Applying a pre-prepared anti-oxidation coating on the surface of the primer layer to form a protective layer; The protective layer is dried to obtain an anti-oxidation PCB board.

2. The protective treatment method for a PCB board according to claim 1, It is characterized in that The primer is an alkyd resin primer, and the thickness of the primer layer is 20 to 30 μm.

3. The protective treatment method for a PCB board according to claim 1, It is characterized in that The anti-oxidation coating is a polyurethane anti-oxidation coating, and the thickness of the protective layer is greater than or equal to 50 μm.

4. The protective treatment method for a PCB board as claimed in claim 3, It is characterized in that The preparation steps of the polyurethane anti-oxidation coating include: An antioxidant is added into polyvinyl alcohol ester to react and generate the polyurethane antioxidant coating.

5. The protective treatment method for a PCB board as claimed in claim 4, It is characterized in that The reaction temperature is 60-100°C and the reaction time is 2-4 hours.

6. The protective treatment method for a PCB board according to claim 1, It is characterized in that The method further comprises: Reflective material is added on the surface of the protective layer.

7. The protective treatment method for a PCB board as claimed in claim 3, It is characterized in that The method further comprises: When it is necessary to remove the protective layer on the surface of the anti-oxidation PCB board, spraying a solvent on the surface of the protective layer; Use plastic film to seal the surface of the protective layer after the solvent is sprayed, and keep it for 15 to 30 minutes; The plastic film is removed to remove the solvent and the protective layer on the surface of the anti-oxidation PCB board; Use clean water and neutral detergent to clean the surface of the treated anti-oxidation PCB board.

8. The protective treatment method for a PCB board according to claim 7, It is characterized in that The solvent is methanol, ethanol or acetone.

9. The protective treatment method for a PCB board as claimed in claim 2, It is characterized in that The method further comprises: When it is necessary to remove the primer layer on the surface of the anti-oxidation PCB board, a cleaning agent is added into a cleaning tank of a cleaning device according to a preset ratio to prepare a cleaning solution; Placing the anti-oxidation PCB board in the cleaning liquid, cleaning the primer layer on the surface of the anti-oxidation PCB board, and controlling the temperature of the cleaning liquid to be a preset temperature and the cleaning time to be a preset time; The cleaning liquid on the surface of the cleaned anti-oxidation PCB board is neutralized.

10. The protective treatment method for a PCB board according to claim 9, It is characterized in that The cleaning agent is an acidic cleaning agent, an alkaline cleaning agent or a neutral cleaning agent.

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