Manufacturing method of aluminized polyimide film

Abstract

The invention discloses a manufacturing method of an aluminized polyimide film, which comprises the following steps: S1, firstly putting a polyimide film into ultrasonic cleaning equipment, and cleaning with deionized water to remove dust and greasy dirt impurities on the surface; s2, then the cleaned film is subjected to drying treatment, and a vacuum drying or hot air drying mode is adopted for drying; s3, carrying out surface treatment on the dried film by adopting a chemical pretreatment or plasma treatment method; s4, carrying out aluminum plating by adopting a vacuum evaporation coating method or a magnetron sputtering coating method in physical vapor deposition (PVD); and S5, after aluminum plating is completed, the thin film is subjected to heat treatment. According to the aluminized polyimide film manufactured through the method, the bonding strength between the aluminum layer and the polyimide film is extremely high, and it is shown through an adhesive tape pasting test and a scratch test that the aluminum layer is not prone to peeling off when subjected to external force, and a good adhesion state can be kept in a complex space mechanical environment.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-plated polyimide film processing, in particular to a method for manufacturing an aluminum-plated polyimide film. Background Art

[0002] Spacecraft face an extremely complex and harsh thermal environment in space. On the one hand, solar radiation causes the spacecraft's surface temperature to rise dramatically; on the other hand, when the spacecraft enters the Earth's shadow, the heat rapidly dissipates, causing the temperature to drop significantly. These drastic temperature fluctuations can severely impact the spacecraft's electronic equipment and structural materials, potentially causing equipment failure and structural damage, thus impacting the spacecraft's normal operation and service life. Therefore, effective in-space thermal control technology is crucial to ensuring spacecraft reliability and performance.

[0003] Currently, in the field of space thermal control, commonly used thermal control materials include multilayer insulation materials and thermal control coatings. Among them, aluminized polyimide film is a key thermal control material, widely used due to its excellent flexibility, high and low temperature resistance, and certain heat reflection capabilities. However, existing aluminized polyimide film still has some shortcomings in space environments.

[0004] For example, under the influence of long-term space radiation and atomic oxygen erosion, the aluminum layer is prone to oxidation and flaking, resulting in a decrease in heat reflectivity. The surface flatness and uniformity of the aluminum layer also need to be improved, which will affect the stability of its thermal control effect. In addition, existing manufacturing processes have certain difficulties in controlling the thickness and bonding strength of the aluminum layer, making it difficult to meet the increasingly stringent requirements of space thermal control. Therefore, it is necessary to develop a manufacturing method for aluminum-coated polyimide film to solve these technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a method for manufacturing an aluminum-plated polyimide film to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for manufacturing an aluminum-coated polyimide film, comprising the following method steps: S1, first placing the polyimide film into an ultrasonic cleaning device and cleaning it with deionized water to remove dust, oil and impurities on the surface; S2, then drying the cleaned film by vacuum drying or hot air drying; S3, surface treating the dried film by chemical pretreatment or plasma treatment; S4, aluminum-coating by vacuum evaporation coating or magnetron sputtering coating in physical vapor deposition (PVD); S5, after aluminum plating is completed, heat treating the film; S6, finally surface inspecting and packaging the film, using optical microscope and scanning electron microscope equipment to inspect the surface flatness and uniformity of the aluminum layer of the film, and packaging after passing the inspection.

[0007] Preferably, the cleaning time in step S1 is 15-30 minutes, and the ultrasonic frequency is controlled at 40-60 kHz.

[0008] Preferably, when vacuum drying is used in step S2, the vacuum degree is controlled at 10 -2 -10 -3 Pa, the temperature is 80-100℃, and the drying time is 2-4 hours; when hot air drying is used, the temperature is 60-80℃, and the drying time is 3-5 hours.

[0009] Preferably, during the chemical pretreatment in step S3, the film is immersed in a specific acid-base solution for 5-10 minutes, then rinsed with deionized water and dried again; during the plasma treatment, the film is placed in a plasma treatment device under an argon or nitrogen atmosphere, with a treatment power of 100-300W and a treatment time of 3-8 minutes.

[0010] Preferably, in step S4, vacuum evaporation coating is adopted, the pre-treated polyimide film is placed in the coating chamber of the vacuum coating equipment, and the vacuum is pumped to 10 -3 -10 -4 Pa, put the aluminum source material into the evaporation boat, heat the evaporation boat to evaporate the aluminum source material, control the evaporation temperature at 1200-1400℃, the coating speed at 0.1-0.5nm / s, and the coating time is determined according to the required aluminum layer thickness and controlled at 10-30 minutes.

[0011] Preferably, in step S4, magnetron sputtering is used for coating, the film is placed in a magnetron sputtering coating device, and vacuumed to 10 -3 -10 -4Pa, introduce argon as sputtering gas, the gas flow rate is 20-50sccm, the sputtering power is set to 200-500W, the target substrate distance is 50-100mm, and the coating time is 15-40 minutes to obtain the required thickness of the aluminum layer.

[0012] Preferably, in step S5, the film is placed in a heat treatment furnace, heated to 150-200° C. under a nitrogen atmosphere, kept warm for 1-2 hours, and then slowly cooled to room temperature.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention adopts a surface treatment process that combines chemical pretreatment and plasma treatment, which can significantly improve the activity and roughness of the polyimide film surface, thereby enhancing the bonding force between the aluminum layer and the film. Compared with the traditional single surface treatment method, this composite treatment process is more effective and can make the aluminum layer more firmly adhere to the film surface in complex space environments;

[0015] (2) The present invention can produce an aluminum layer with high uniformity and good flatness by precisely controlling the process parameters of vacuum evaporation coating and magnetron sputtering coating. During the coating process, parameters such as temperature, vacuum degree, and coating speed are monitored and adjusted in real time to ensure the quality and stable performance of the aluminum layer. At the same time, the thickness of the aluminum layer can be precisely controlled according to different application requirements to meet diverse spatial thermal control requirements.

[0016] (3) The introduction of the post-heat treatment process of the present invention further improves the bonding strength between the aluminum layer and the polyimide film and the crystallinity of the aluminum layer. After heat treatment, the oxidation resistance and thermal stability of the aluminum layer are significantly improved, which can better adapt to the long-term space environment and ensure the long-term stability of the thermal control performance of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flowchart of the overall method steps of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figure 1The present invention provides an embodiment of a method for manufacturing an aluminum-plated polyimide film, comprising the following steps: S1, first placing the polyimide film in an ultrasonic cleaning device and cleaning it with deionized water to remove dust, oil and impurities on the surface; S2, then drying the cleaned film by vacuum drying or hot air drying; S3, surface treating the dried film by chemical pretreatment or plasma treatment;

[0020] S4. Aluminum is plated by vacuum evaporation or magnetron sputtering in physical vapor deposition (PVD). S5. After aluminum plating, the film is heat treated. S6. Finally, the film is surface inspected and packaged. The surface flatness and uniformity of the aluminum layer of the film are inspected by optical microscope and scanning electron microscope. The film is packaged after passing the inspection.

[0021] Furthermore, in step S1, the cleaning time is 15-30 minutes, and the ultrasonic frequency is controlled at 40-60 kHz.

[0022] Furthermore, when vacuum drying is used in step S2, the vacuum degree is controlled at 10 -2 -10 -3 Pa, the temperature is 80-100℃, and the drying time is 2-4 hours; when hot air drying is used, the temperature is 60-80℃, and the drying time is 3-5 hours.

[0023] Furthermore, during the chemical pretreatment in step S3, the film is immersed in a specific acid-base solution for 5-10 minutes, then rinsed with deionized water and dried again; during plasma treatment, the film is placed in a plasma treatment device under an argon or nitrogen atmosphere with a treatment power of 100-300W and a treatment time of 3-8 minutes.

[0024] Furthermore, in step S4, vacuum evaporation coating is adopted, and the pretreated polyimide film is placed in the coating chamber of the vacuum coating equipment, and the vacuum is pumped to 10 -3 -10 -4 Pa, put the aluminum source material into the evaporation boat, heat the evaporation boat to evaporate the aluminum source material, control the evaporation temperature at 1200-1400℃, the coating speed at 0.1-0.5nm / s, and the coating time is determined according to the required aluminum layer thickness and controlled at 10-30 minutes.

[0025] Furthermore, in step S4, magnetron sputtering coating is adopted, the film is placed in a magnetron sputtering coating device, and vacuumed to 10 -3 -10 -4Pa, introduce argon as sputtering gas, the gas flow rate is 20-50sccm, the sputtering power is set to 200-500W, the target substrate distance is 50-100mm, and the coating time is 15-40 minutes to obtain the required thickness of the aluminum layer.

[0026] Furthermore, in step S5, the film is placed in a heat treatment furnace, heated to 150-200° C. under a nitrogen atmosphere, kept warm for 1-2 hours, and then slowly cooled to room temperature.

[0027] The performance comparison of the aluminum-plated polyimide film of the present invention and existing products is shown in the following table:

[0028] Performance indicators Product of the present invention Existing products <![CDATA[Aluminum layer bonding strength (N / cm 2 )]]> ≥10 6-8 Thermal reflectivity reduction rate after anti-oxidation ≤5％ 10％-20％ Surface roughness Ra (nm) ＜10 15-20 Aluminum layer thickness deviation Within ±5% ±10％-±15％ Thermal control temperature fluctuation range (℃) ±5 ±10-±15

[0029] In summary, the manufacturing method of the aluminum-coated polyimide film of the present invention, through unique surface treatment, precise coating process control and optimized post-processing process, prepares an aluminum-coated polyimide film with high bonding strength, excellent anti-oxidation performance, high flatness and uniformity, and good thermal control performance. It can meet the thermal control requirements of spacecraft in complex space environments and has broad application prospects.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing an aluminum-plated polyimide film, characterized in that: The method comprises the following steps: S1. First, place the polyimide film in an ultrasonic cleaning device and clean it with deionized water to remove dust, oil and impurities on the surface; S2, then drying the cleaned film by vacuum drying or hot air drying; S3, performing surface treatment on the dried film by using a chemical pretreatment or plasma treatment method; S4. Aluminum is plated by vacuum evaporation coating or magnetron sputtering coating in physical vapor deposition (PVD); S5. After the aluminum plating is completed, the film is heat treated; S6. Finally, the film is surface inspected and packaged. The surface flatness and uniformity of the aluminum layer of the film are inspected using an optical microscope and a scanning electron microscope. The film is packaged after passing the inspection.

2. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: The cleaning time in step S1 is 15-30 minutes, and the ultrasonic frequency is controlled at 40-60 kHz.

3. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: When vacuum drying is used in step S2, the vacuum degree is controlled at 10 -2 -10 -3 Pa, the temperature is 80-100℃, and the drying time is 2-4 hours; when hot air drying is used, the temperature is 60-80℃, and the drying time is 3-5 hours.

4. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: During the chemical pretreatment in step S3, the film is immersed in a specific acid-base solution for 5-10 minutes, then rinsed with deionized water and dried again; during the plasma treatment, the film is placed in a plasma treatment equipment under an argon or nitrogen atmosphere with a treatment power of 100-300W and a treatment time of 3-8 minutes.

5. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: In step S4, vacuum evaporation coating is adopted to place the pretreated polyimide film into the coating chamber of the vacuum coating equipment, and evacuate to 10 -3 -10 -4 Pa, put the aluminum source material into the evaporation boat, heat the evaporation boat to evaporate the aluminum source material, control the evaporation temperature at 1200-1400℃, the coating speed at 0.1-0.5nm / s, and the coating time is determined according to the required aluminum layer thickness and controlled at 10-30 minutes.

6. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: In step S4, magnetron sputtering coating is adopted, and the film is placed in a magnetron sputtering coating device and vacuumed to 10 -3 -10 -4 Pa, introduce argon as sputtering gas, the gas flow rate is 20-50sccm, the sputtering power is set to 200-500W, the target substrate distance is 50-100mm, and the coating time is 15-40 minutes to obtain the required thickness of the aluminum layer.

7. The method for manufacturing an aluminum-plated polyimide film according to claim 1, wherein: In step S5, the film is placed in a heat treatment furnace, heated to 150-200° C. under a nitrogen atmosphere, kept warm for 1-2 hours, and then slowly cooled to room temperature.

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