Surface treatment method, equipment and coated product for polymer-based films

Abstract

The present invention discloses a method, equipment and coated product for surface treatment of a polymer base film, the treatment method includes providing a base film surface modification device at the discharge end of the polymer base film before coating, so as to form an active interface on the surface of the polymer base film that undergoes a chemical bond reaction with the coating material, the equipment includes an unwinding roller, a winding roller and a film layer deposition area, and an ultraviolet ray radiator is provided on one or both sides of the polymer base film between the film layer deposition area and the unwinding roller, the coated product includes a polymer base film, a reinforcing layer and a functional coating layer, the reinforcing layer strengthens the adhesion between the functional coating layer and the polymer base film, and is formed by chemically bonding the coating layer material to the active interface on the surface of the polymer base film. The present invention uses an ultraviolet ray radiator to irradiate the surface of the polymer base film to form an active interface and enhance the adhesion between the coating film and the polymer base film, so that the surface treatment of the polymer base film can be more easily realized, and the surface treatment process is pollution-free and highly efficient.

Description

[Technical Field]

[0001] The present invention relates to the technical field of coatings, and more particularly to a method, an apparatus and a coated product for treating the surface of a polymer-based film. [Background technology]

[0002] Currently, the most widely used method for further expanding the functionality and application fields of polymer base films is to combine functional film layers with polymer base films. That is, a thin film is deposited on the surface of the polymer base film to form a composite material with functions such as blocking and conducting. One of the important characteristics of coated products is that the coated film layer has good adhesion properties. Typically, the base film surface is modified using physical methods (such as plasma and corona discharge) and chemical methods (such as surface grafting) to enhance the adhesion of the coating layer.

[0003] However, among conventional modification methods, the modification method that performs plasma bombardment in a vacuum environment requires a relatively complex equipment structure and makes it difficult to guarantee long-term production operation due to the operation and maintenance of the plasma equipment. Corona discharge treatment before coating requires an additional process, and the surface graft modification method requires an additional process that may cause contamination of the base film surface, and the equipment system is relatively more complex.

[0004] It would be valuable to address the above mentioned shortcomings. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to overcome the drawbacks of the prior art that the surface treatment of polymer-based films is not easy and the system configuration is complicated, the present invention provides a method, an apparatus and a coated product for treating the surface of a polymer-based film. [Means for solving the problem]

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a surface treatment method for a polymer base film, which comprises providing a base film surface modification device at the discharge end of the polymer base film before coating, so as to form an active interface on the surface of the polymer base film that undergoes a chemical bonding reaction with the coating material.

[0008] The present invention according to the above scheme is characterized in that it includes providing an ultraviolet radiation device at the discharge end of the polymer base film so that oxygen-containing groups are introduced into the surface of the polymer base film by induction after irradiation.

[0009] The present invention according to the above scheme is characterized by including a trace gas distribution pipe line at the discharge end of the polymer base film before coating, which delivers an oxygen-containing atmosphere to the surface of the polymer base film.

[0010] In another aspect, the present invention provides a surface treatment device for a polymer base film, comprising an unwinding roller, a winding roller, and a film layer deposition area located between the unwinding roller and the winding roller, wherein the polymer base film unwound from the unwinding roller passes through the film layer deposition area and is then wound up onto the winding roller, The surface treatment equipment for polymer base films is characterized in that an ultraviolet radiation device is provided between the film layer deposition area and the unwinding roller, which irradiates one or both sides of the polymer base film to form an active interface on the surface.

[0011] The present invention according to the above proposal is characterized in that there is a positive correlation between the radiation intensity of the ultraviolet radiation device and the transport speed of the polymer base film.

[0012] The present invention according to the above proposal is characterized in that the distance from the polymer base film to the ultraviolet radiation device and the transport speed of the polymer base film are negatively correlated.

[0013] The present invention relating to the above proposal is characterized in that a trace gas distribution pipe line is further provided between the ultraviolet radiation device and the unwinding roller, arranged on one or both sides of the polymer base film, for transporting an oxygen-containing atmosphere to the surface of the polymer base film.

[0014] The present invention according to the above proposal is characterized by including a functional coating layer deposition module in which a film layer deposition area is located on one or both sides of the polymer base film.

[0015] The present invention further provides a coated product comprising a polymer base film and a functional coating layer on the surface of the polymer base film, wherein a reinforcing layer is provided between the polymer base film and the functional coating layer to strengthen the adhesion between the functional coating layer and the polymer base film, and the reinforcing layer is formed by chemically bonding the coating layer material to the active interface on the surface of the polymer base film.

[0016] The present invention according to the above proposal is characterized in that a buffer layer is further provided between the polymer base film and the functional coating layer, and the reinforcement layer is located between the buffer layer and the polymer base film, and is formed by chemically bonding the material of the buffer layer to the active interface on the surface of the polymer base film.

[0017] The beneficial effect of the present invention is that the invention introduces an ultraviolet radiation device into the coating vacuum chamber, and the ultraviolet radiation device irradiates the surface of the polymer base film to form an active interface, thereby creating conditions for chemical bonding with the coating layer during the subsequent deposition process on the base film surface and further increasing the adhesion between the coating film and the polymer base film. This eliminates the need for additional extensive modification equipment in the entire coating system, making the surface treatment of polymer base films easier, resulting in a pollution-free and highly efficient surface treatment process. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a structural schematic diagram of Example 1 of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of Example 2 of the present invention. [Figure 3] FIG. 1 is a structural schematic diagram of Example 3 of the present invention. [Figure 4] FIG. 1 is a structural schematic diagram of Example 4 of the present invention. [Figure 5] FIG. 10 is a structural schematic diagram of Example 5 of the present invention. [Figure 6] FIG. 10 is a structural schematic diagram of Example 6 of the present invention. [Figure 7] FIG. 10 is a structural schematic diagram of Example 7 of the present invention. [Figure 8] FIG. 10 is a structural schematic diagram of Example 8 of the present invention. [Figure 9] FIG. 10 is a structural schematic diagram of Example 9 of the present invention. [Figure 10] 1 is a structural schematic diagram of a coated product in one embodiment of the present invention; [Figure 11] FIG. 2 is a structural schematic diagram of a coated product in another specific embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be further described below in combination with drawings and embodiments.

[0020] The present invention provides a method for surface treatment of a polymeric base film that can more easily perform surface treatment on a polymeric base film in a vacuum coating environment, thereby generating a structure on the surface to be coated that can form a chemical bond with the coating layer and improving the adhesion of the coating layer.The purpose of surface modification of the polymeric base film is achieved by providing a base film surface modification device at the discharge end of the polymeric base film before coating, so that an active interface that can undergo a chemical bonding reaction with the coating material is formed on the surface of the polymeric base film.

[0021] The base film surface modification device is an ultraviolet radiation device, i.e., an ultraviolet radiation device is installed at the discharge end of the polymer base film so that oxygen-containing groups can be introduced onto the surface of the polymer base film by induction after irradiating the surface with water molecules, oxygen molecules, etc. Specifically, oxygen-containing groups can be introduced onto the surface of the polymer base film by irradiation with an ultraviolet radiation device in the vacuum chamber of a vacuum web coating machine. Here, the oxygen-containing groups include oxygen-containing groups such as single-bonded oxygen (COC, C-OH), carbonyl groups (C=O), and carboxyl groups (COOH). These oxygen-containing groups provide an active interface for the subsequent deposition of a coating layer on the polymer base film, and also initiate a chemical bonding reaction between the coating material (e.g., metal) and the oxygen-containing groups, establishing a chemical bonding valence structure at the interface, ultimately achieving the effect of increasing the adhesive strength at the interface between the coating film layer and the polymer base film.

[0022] In the subsequent coating process, the polymer base film having an active interface enters the film layer deposition area, and the coating material in the film layer deposition area chemically bonds with the active interface to form a reinforcing layer, thereby enhancing the adhesion of the coating layer to the surface of the polymer base film. Specifically, the coating material deposited in the film layer deposition area is a metal material, and the metal in the film layer deposition area chemically bonds with the active interface to form a metal oxide, thereby enhancing the adhesion of the coating layer to the surface of the polymer base film.

[0023] Metallic materials such as Ti and Ti alloys, Al and Al alloys, and Cr and Cr alloys, which have excellent buffering and adhesive properties, can be used. These metallic materials are deposited by evaporation, magnetron sputtering, or other methods. When highly reactive atomic or ionic materials are attached to the surface of the base film, they are more likely to form similar chemically bonded components, such as TiOx, CrOx, and aluminum oxide, with the active interface of the polymer base film, thereby enhancing the adhesion of the coating layer to the base film surface.

[0024] The polymer base film may be made of PET (polyethylene terephthalate), PI (polyimide), PPS (polyphenyl sulfide), PP (polypropylene), PE (polyethylene), PC (polycarbonate), PEN (polyethylene naphthalate), PS (polystyrene), PA (polyamide), PTFE (polytetrafluoroethylene), PES (ethylene vinyl acetate copolymer), PEI (polyetherimide), PEEK (polyether ether ketone), etc. The method of the present invention is particularly advantageous for polymer base films having non-polar properties.

[0025] The ultraviolet radiation device may be a UV radiation tube lamp. The UV radiation tube lamp may be a commercially available product in the UVA wavelength band (wavelength 320-420 nm, also known as long-wave black spot effect UV), UVB wavelength band (wavelength 275-320 nm, also known as medium-wave red spot effect UV), UVC wavelength band (wavelength 200-275 nm, also known as short-wave germicidal UV), or UVD wavelength band (wavelength 100-200 nm, also known as vacuum UV). The UV light emitted from the UV radiation device is absorbed by the polymer groups of the polymer base film, cleaving the bonds of those groups. Furthermore, substances such as water molecules and oxygen molecules adsorbed on the surface of the groups generate new groups with single or double bonds of oxygen. By selecting appropriate UV light, the bonds of the cleaved oxygen molecules are excited to generate atomic oxygen, ultimately resulting in the formation of a modified base film surface with highly active groups or interfaces.

[0026] Furthermore, to generate more oxygen-containing groups on the surface of the base film, a trace gas distribution line is installed at the discharge end of the polymer base film before coating to deliver an oxygen-containing atmosphere to the surface of the polymer base film. The trace gas distribution line is connected to a flow control device, and a precise flow control device enables the delivery of the oxygen-containing atmosphere through the gas distribution line, so that the introduction of the oxygen-containing atmosphere does not affect the subsequent deposition of thin films. In a specific implementation process, the oxygen-containing atmosphere is a trace-mixing method, such as a mixed atmosphere of 99.5% Ar+ and 0.5% O2. An ozone source may be used instead of oxygen.

[0027] As shown in Figures 1 to 9, the present invention provides a surface treatment device for polymeric base films, and provides the hardware conditions necessary for surface treatment of the base film by arranging ultraviolet lamp irradiation devices on both sides of the base film withdrawal position on the unwinding side of the raw film of the coating material in a vacuum chamber.

[0028] The surface treatment device for polymer-based films includes an unwinding roller 10, a winding roller 20, and a film layer deposition area located between the unwinding roller 10 and the winding roller 20, and the polymer-based film 31 unwound from the unwinding roller passes through the film layer deposition area and is then wound up by the winding roller 20. The unwinding roller 10 unwinds the polymer-based film 31, the film layer deposition area coats the surface of the polymer-based film 31, and the winding roller winds up the coated product 30 after coating.

[0029] To ensure smooth film transport throughout the entire coating machine and to save space inside the coating machine, an unwinding pass-through roller 11 is provided between the unwinding roller 10 and the film layer deposition area, and after being unwound, the polymer base film 31 is wound around the unwinding pass-through roller 11 before entering the film layer deposition area. Correspondingly, to ensure the flatness of the coated product 30 after winding, a winding flattening roller 21 is provided between the end of the film layer deposition area and the winding roller 20, and after coating is complete, the coated product 30 is wound around the winding flattening roller 21 and then wound onto the winding roller 20.

[0030] In order to improve the adhesion between the coating film and the polymer base film, an ultraviolet radiation device is provided between the film layer deposition area and the unwinding roller of the present invention to irradiate one or both sides of the polymer base film, and when the polymer base film is unwound, the ultraviolet radiation device begins to operate, forming an active interface on the surface of the polymer base film.

[0031] The ultraviolet radiation device is attached to a position adjustment device, which adjusts the distance between the ultraviolet radiation device and the polymer base film, and further adjusts the irradiation distance according to the transport speed of the polymer base film. Specifically, the distance from the polymer base film to the ultraviolet radiation device and the transport speed of the polymer base film are negatively correlated. The irradiation intensity of the ultraviolet radiation device can also be adjusted, and the irradiation intensity can be adjusted according to the transport speed of the polymer base film. Specifically, the radiation intensity of the ultraviolet radiation device and the transport speed of the polymer base film are positively correlated.

[0032] Generally, the transport speed of a polymer base film is in a very wide range, and the typical transport speed of a polymer base film is 2m / min to 400m / min. In this case, the radiation intensity of the ultraviolet radiation device is 0.5mW / cm2 to 500mW / cm2, and the distance from the polymer base film to the ultraviolet radiation device is 1cm to 10cm.

[0033] The film layer deposition zone forms a coating on the surface of the polymer base film and includes functional coating layer deposition modules located on one or both sides of the polymer base film. The one-side functional coating layer deposition module coats one side of the polymer base film, while the two-side functional coating layer deposition modules coat both sides of the polymer base film. Both the functional coating layer deposition module and the buffer layer deposition module include a deposition cooling roller, a coating layer evaporation source, a flattening roller, and a passing roller. The polymer base film is wound around the flattening roller, deposition cooling roller, and passing roller in sequence, and the coating layer evaporation source is located on the outer side of the deposition cooling roller.

[0034] If necessary, the film layer deposition area further includes a buffer layer deposition module, which is located upstream of the functional coating layer deposition module along the film transport direction of the polymer base film, and the buffer layer deposition module coats a buffer layer on the surface of the polymer base film, and the subsequent functional coating layer deposition module forms a functional coating layer, thereby achieving buffering and further strengthening between the functional coating layer and the surface of the polymer base film. Example 1

[0035] As shown in FIG. 1, in this embodiment, the ultraviolet radiation tube lamps of the ultraviolet radiation device are arranged on both sides of the polymer base film, and the irradiation intensity of the ultraviolet radiation tube lamps and their distance from the polymer base film are adjusted according to the transport speed of the polymer base film.

[0036] Specifically, this example uses a PI base film as the substrate of the coating material, and the structure of the formed coated product can be considered as PI / reinforcement layer / functional layer. Note that the polymer base film conveying speed in this example is 2m / min, and the UV radiation tube lamp is used with a radiation intensity of 5mW / cm2 and a radiation distance of 4cm.

[0037] In this embodiment, coating is performed using a one-sided deposition method. That is, the functional coating layer deposition module includes a first deposition module 40, which includes a first deposition cooling roller 41, a first evaporation mechanism 42, a first deposition flattening roller 43, and a first deposition passing roller 44. The first evaporation mechanism 42 is located below the first deposition cooling roller 41. The polymer base film is wound around the first deposition flattening roller 43, the first deposition cooling roller 41, and the first deposition passing roller 44 in this order, and one-sided deposition is completed by the first evaporation mechanism 42.

[0038] The functional coating layer may be a metal film layer, a metal compound film layer, or the like. Example 2

[0039] As shown in Figure 2, this embodiment differs from Example 1 in that coating is performed using a double-sided evaporation method. That is, the functional coating layer deposition module includes a first deposition module 40 and a second deposition module 50. Specifically, the first deposition module 40 includes a first deposition cooling roller 41, a first evaporation mechanism 42, a first deposition flattening roller 43, and a first deposition passing roller 44, with the first evaporation mechanism 42 located below the first deposition cooling roller 41. The second deposition module 50 includes a second deposition cooling roller 51, a second evaporation mechanism 52, a second deposition flattening roller 53, and a second deposition passing roller 54, with the second evaporation mechanism 52 located below the second deposition cooling roller 51.

[0040] The polymer base film is wound around the first film-forming flattening roller 43, the first film-forming cooling roller 41, and the first film-forming passing roller 44 in that order, and deposition on one side is completed by the first evaporation mechanism 42. Then, the polymer base film is wound around the second film-forming flattening roller 53, the second film-forming cooling roller 51, and the second film-forming passing roller 54 in that order, and deposition on the other side is completed by the second evaporation mechanism 52. Example 3

[0041] As shown in FIG. 3, this embodiment differs from Example 2 in that the buffer layer deposition on both sides is first completed by the buffer layer deposition module before the functional layer coating is completed.

[0042] The buffer layer deposition module includes a first deposition module 40 and a second deposition module 50. The first deposition module 40 includes a first deposition cooling roller 41, a first evaporation mechanism 42, a first deposition flattening roller corresponding to the first deposition cooling roller 41, and a first deposition passing roller. The second deposition module 50 includes a second deposition cooling roller 51, a second evaporation mechanism 52, a second deposition flattening roller corresponding to the second deposition cooling roller 51, and a second deposition passing roller. The polymer base film is wound around the first deposition flattening roller, the first deposition cooling roller 41, and the first deposition passing roller in this order, and deposition of the buffer layer on one side is completed by the first evaporation mechanism 42. The polymer base film is then wound around the second film-forming flattening roller, the second film-forming cooling roller 51, and the second film-forming passing roller in this order, and the deposition of the buffer layer on the other side is completed by the second evaporation mechanism 52.

[0043] The functional coating layer deposition module includes a third deposition module 60 and a fourth deposition module 70. The third deposition module 60 includes a third deposition cooling roller 61, a third evaporation mechanism 62, a third deposition flattening roller corresponding to the third deposition cooling roller 61, and a third deposition passing roller. The fourth deposition module 70 includes a fourth deposition cooling roller 71, a fourth evaporation mechanism 72, a fourth deposition flattening roller corresponding to the fourth deposition cooling roller 71, and a fourth deposition passing roller. The polymer base film is wound around the third deposition flattening roller, the third deposition cooling roller 61, and the third deposition passing roller in this order, and deposition of the functional coating layer on one side is completed by the third evaporation mechanism 62. The polymer base film is then wound around the fourth film-forming flattening roller, the fourth film-forming cooling roller 71, and the fourth film-forming passing roller in this order, and the deposition of the functional coating layer on the other side is completed by the fourth evaporation mechanism 72.

[0044] In a specific implementation process, the buffer layer may be Ti and Ti alloy, or Cr and Cr alloy, and the functional coating layer is often a metal film layer, a metal compound film layer, etc. In this embodiment, metal Ti is used as the buffer layer and metal Al is used as the functional coating, and the total thickness of the coating layer (including the buffer layer and the functional coating layer) after coating can be 150 nm. Example 4

[0045] 4, this embodiment differs from Example 1 in that a trace amount of oxygen-containing atmosphere is first introduced before irradiation by the ultraviolet irradiator 12. A trace amount of gas distribution pipe 13 is further provided between the ultraviolet irradiator 12 and the unwinding roller 10, and is arranged on one or both sides of the polymer base film 31 to deliver the oxygen-containing atmosphere to the surface of the polymer base film 31.

[0046] In this embodiment, coating is performed using a vapor deposition method, and a trace amount of an oxygen-containing atmosphere is introduced using a trace gas distribution line 13 to form a strengthening layer (e.g., aluminum oxide). Simply introducing a trace amount of oxygen-containing atmosphere quickly forms single-bonded oxygen and double-bonded oxygen groups. Furthermore, since the trace gas distribution line 13 is a certain distance from the evaporation coating position, the introduced oxygen-containing atmosphere has almost no effect on the evaporation coating. Furthermore, the oxygen-containing groups generated by the oxygen-containing atmosphere are quickly consumed when chemically bonding with the metal to form the strengthening oxide layer, so they do not affect the subsequent formation of the functional coating layer. Example 5

[0047] As shown in FIG. 5, this embodiment differs from the second embodiment in that a trace gas distribution pipe 13 is further provided between the ultraviolet ray emitting device 12 and the unwinding roller 10. Example 6

[0048] As shown in FIG. 6, this embodiment differs from the third embodiment in that a trace gas distribution pipe 13 is further provided between the ultraviolet ray emitting device 12 and the unwinding roller 10. Example 7

[0049] 7, this embodiment differs from Example 4 in that the functional coating layer is formed by sputter coating. That is, a plurality of first targets 45 are arranged on the outer periphery of the first film-forming cooling roller 41, and sputter coating is performed via the first targets 45.

[0050] In this embodiment, sputter coating is performed, and the sputter coating process requires the introduction of sputtering gas. In this embodiment, an oxygen-containing atmosphere is introduced at the film discharge end of the unwind roller 10 using a trace gas distribution pipe 13. The concentration of the sputtering gas is much higher than that of the oxygen-containing atmosphere, and most of the sputtering gas diffuses, preventing the oxygen-containing atmosphere from diffusing to the sputter coating location. In addition, because there is a certain distance from the sputter coating location to the trace gas distribution pipe, the introduced oxygen-containing atmosphere does not affect the sputter coating. Example 8

[0051] 8, this example differs from Example 5 in that the functional coating layer is coated by sputter coating. That is, a plurality of first targets 45 are arranged on the outer periphery of the first film-forming cooling roller 41, and sputter coating is performed via the first targets 45. A plurality of second targets 55 are arranged on the outer periphery of the second film-forming cooling roller 51, and sputter coating is performed via the second targets 55 on the other side of the polymer base film. Example 9

[0052] As shown in Figure 9, this embodiment differs from Example 6 in that the buffer layer and functional coating layer are coated by sputter coating. Specifically, multiple first targets 45 are arranged on the outer periphery of the first film-forming cooling roller 41, and one side of the polymer base film 31 is sputter-coated via the first targets 45 to form a buffer layer. Multiple second targets 55 are arranged on the outer periphery of the second film-forming cooling roller 51, and the other side of the polymer base film is sputter-coated via the second targets 55 to form a buffer layer. Multiple third targets 63 are arranged on the outer periphery of the third film-forming cooling roller 61, and one side of the polymer base film 31 is sputter-coated via the third targets 63 to form a functional coating layer. Multiple fourth targets 73 are arranged on the outer periphery of the fourth film-forming cooling roller 71, and the other side of the polymer base film is sputter-coated via the fourth targets 73 to form a functional coating layer.

[0053] In the above example, evaporation coating requires an evaporation mechanism, while sputtering coating requires a target and the introduction of a gas, such as argon gas. Furthermore, if coating is required on both sides of a polymer base film in a single vacuum chamber, two deposition cooling rollers are used, and the same coating method is used at the positions of the two deposition cooling rollers. For example, both can be evaporation coated, or both can be sputter coated.

[0054] All of the above coating processes are performed in a vacuum environment. Sputter coating requires the introduction of a sputtering gas. When adding a trace gas distribution line, the concentration of the introduced oxygen-containing atmosphere is much lower than that of the sputtering gas, and most of the sputtering gas diffuses, preventing the oxygen-containing atmosphere from diffusing to the sputter coating location. In addition, since there is a certain distance between the sputter coating location and the trace gas distribution line, the introduced oxygen-containing atmosphere does not affect the sputter coating.

[0055] As shown in Figures 10 and 11, the present invention further provides a coated product with adhesive strength of 600 N / m, which is more than 100% higher than before the improvement. This coated product includes a polymer base film and a functional coating layer on the surface of the polymer base film, and a reinforcing layer is provided between the polymer base film and the functional coating layer to strengthen the adhesive strength between the functional coating layer and the polymer base film. The reinforcing layer is formed by chemically bonding the coating layer material to the active interface on the surface of the polymer base film.

[0056] Specifically, in FIG. 10, the coated product 30 includes a polymer base film 31, an aluminum layer 33 as a functional coating layer, and an aluminum oxide layer 32 between the polymer base film 31 and the aluminum layer 33. The aluminum oxide layer 32 is a reinforcing layer formed by chemical bonding between the aluminum metal (the raw material of the aluminum layer 33) and the active interface on the surface of the polymer base film 31. The coated product is formed by directly coating aluminum. When the aluminum metal material comes into contact with the surface of the polymer base film 31, the aluminum oxide layer 32 is first formed, followed by the aluminum layer 33. The thickness of the functional coating layer (aluminum layer 33) is controlled between 200 nm and 1500 nm depending on the product's needs, and the thickness of the reinforcing layer (aluminum layer 33) is 10 nm or less. When a trace gas distribution pipe as shown in FIG. 4 or FIG. 7 is added to introduce an oxygen-containing atmosphere, the aluminum oxide layer becomes thicker (more than 10 nm but less than 25 nm), resulting in stronger adhesion.

[0057] In a preferred embodiment shown in Figure 11, a buffer layer is further provided between the polymer base film and the functional coating layer, and a reinforcement layer is located between the buffer layer and the polymer base film, and is formed by chemically bonding the material of the buffer layer to the active interface on the surface of the polymer base film.

[0058] Specifically, in Figure 11, the coated product 30 includes a polymer base film 31 and an aluminum layer 33 as a functional coating layer, and between the polymer base film 31 and the aluminum layer 33 are provided a titanium oxide layer 34 (TiOx layer) as a reinforcing layer and a titanium layer 35 as a buffer layer, and the reinforcing layer is formed by chemical bonding of titanium, which is the raw material of the buffer layer, with the active interface on the surface of the polymer base film 31.

[0059] Before forming the functional coating layer (aluminum layer 33), first a titanium oxide layer 34 is formed, then a titanium layer 35 is formed, and finally an aluminum layer 33 is formed. When a trace gas distribution line is added to introduce an oxygen-containing atmosphere, the titanium oxide layer 34 becomes thicker and has stronger adhesion. In one example, when an oxygen-containing atmosphere is introduced, the thickness of the titanium oxide layer 35 is within 25 nm (usually within 10 nm when no trace oxygen-containing atmosphere is introduced), the thickness of the titanium layer 35 is 200 nm to 800 nm, and the thickness of the aluminum layer 33 is 200 nm to 800 nm.

[0060] In the above specific embodiment, the functional coating layer is an aluminum layer, which can be formed by evaporation coating or sputter coating, and the functional coating layer can be a copper layer, which can also be formed by evaporation coating or sputter coating.

[0061] The present invention further provides comparative experiments.

[0062] The following description will be given taking as an example Example 1, which is a basic example. First, a coated sample AA1 is obtained without operating the ultraviolet radiation device, and then a coated sample AA2 with a reinforcing layer is obtained by operating the ultraviolet radiation device.

[0063] 1. Compare the adhesive performance of coated sample AA1 and coated sample AA2.

[0064] The adhesive strength of the coating layer was tested by attaching 20mm wide adhesive tape, which requires a peeling force of 1000N / m, to the surfaces of coated sample AA1 and coated sample AA2, and pulling it at a 180° angle at a speed of 50mm / min using a tensile tester. As a result of the test, the adhesive strength of coated sample AA1, which was not exposed to UV light, reached 287N / m, and the adhesive strength of coated sample AA2 reached 749N / m.

[0065] The adhesive performance of the coated samples reinforced by the method of the present invention was significantly improved.

[0066] 2. Compare the adhesive performance of coated sample AA1 and coated sample AA2.

[0067] The present invention further simulated the electrolytic environment for lithium-ion batteries, and tested the adhesive performance of the coated sample AA1 and the coated sample AA2 after immersing them in chemicals, respectively.

[0068] After immersing them in a standard lithium-ion battery electrolyte and sealing them, the coated samples AA1 and AA2 maintained good adhesive performance even after baking at 85°C for 72 hours, with adhesive strengths of 213 N / m for coated sample AA1 and 688 N / m for coated sample AA2, respectively, which were 74% and 92% of their original strengths.

[0069] Therefore, the coated sample AA2, which was reinforced by the method of the present invention, retained the advantage of good adhesion performance.

[0070] 3. Compare the mechanical strength of coated sample AA1 and coated sample AA2.

[0071] Taking a 10mm wide sample as an example, when measuring the tensile strength of the sample at a pulling speed of 50mm / min, the tensile strength of coated sample AA1 can reach 195MPa, and the tensile strength of coated sample AA2 can reach 231Mpa.

[0072] The present invention utilizes the above-mentioned surface treatment method and equipment for polymer-based films to achieve non-polluting surface treatment of polymer-based films, improving adhesion performance by more than two times compared to thin films formed by directly depositing a coating layer without conventional surface treatment. Furthermore, by forming a reinforcing layer through chemical bonding, the metal oxide component of the reinforcing layer can function to achieve interface passivation. The deposited thin film material has better chemical resistance and significantly improved mechanical strength (tensile strength).

[0073] It should be understood that those skilled in the art may make improvements or modifications based on the above description, and all such improvements and modifications are intended to fall within the scope of the claims appended hereto.

[0074] Although the present invention has been described above in an exemplary manner in conjunction with the accompanying drawings, it is clear that the realization of the present invention is not limited to the above manner, and various improvements using the methods, concepts and technical solutions of the present invention, or direct application of the concepts and technical solutions of the present invention to other cases without improvements, are all within the protection scope of the present invention. [Explanation of symbols]

[0075] 10 Unwinding roller 11 Unwinding passing roller 12 Ultraviolet radiation device 13 Trace gas distribution line 20 Winding roller 21 Winding flattening roller 30 Coated products 31 Polymer-based film 32 Aluminum oxide layer 33 Aluminum layer 34 Titanium oxide layer 35 titanium layer 40 First deposition module 41 First coating cooling roller 42 First evaporation mechanism 43 First coating flattening roller 44 First film forming passing roller 45 First Target 50 Second deposition module 51 Second coating cooling roller 52 Second evaporation mechanism 53 Second coating flattening roller 54 Second film forming passing roller 55 Second Target 60 Third deposition module 61 Third coating cooling roller 62 The third evaporation mechanism 63 Third Target 70 4th deposition module 71 4th coating cooling roller 72 The fourth evaporation mechanism 73 Fourth Target

Claims

1. A method for surface treating a polymer base film using a surface treating device for a polymer base film, comprising: The surface treatment device for the polymer base film includes, in order from the upstream side to the downstream side, a winding roller, a trace gas distribution pipe line, an ultraviolet ray radiating device, a film layer deposition area as a base film surface modification device, and a winding roller; the unwinding roller, the trace gas distribution pipe line, the ultraviolet radiation device, the film layer deposition area, and the winding roller are housed within a single vacuum chamber; a functional coating layer deposition module having an evaporation mechanism is provided in the film layer deposition area; the trace gas distribution line delivers an oxygen-containing atmosphere to the surface of the polymer base film; The ultraviolet radiation device irradiates ultraviolet light onto the surface of the polymer base film, thereby introducing oxygen-containing groups through induction, thereby forming an active interface on the surface of the polymer base film that undergoes a chemical bonding reaction with the coating material; the evaporation mechanism of the functional coating layer deposition module chemically bonds the coating material with an active interface on the surface of the polymer base film; A surface treatment method for a polymer base film, comprising:

2. A surface treatment device for a polymer base film, comprising: an unwinding roller; a winding roller; and a film layer deposition area located between the unwinding roller and the winding roller, wherein the polymer base film unwound from the unwinding roller passes through the film layer deposition area and is then wound onto the winding roller, Between the film layer deposition area and the unwinding roller, an ultraviolet radiation device is provided to irradiate one or both sides of the polymer base film to form an active interface on the surface thereof; a trace gas distribution pipe line disposed on one or both sides of the polymer base film between the ultraviolet radiation device and the unwinding roller, the trace gas distribution pipe line delivering an oxygen-containing atmosphere to the surface of the polymer base film; The film layer deposition area includes a functional coating layer deposition module located on one or both sides of the polymer base film; the functional coating layer deposition module has an evaporation mechanism for chemically bonding a coating material to an active interface on the surface of the polymer base film; the unwinding roller, the trace gas distribution pipe line, the ultraviolet radiation device, the film layer deposition area, and the winding roller are housed within a single vacuum chamber; A surface treatment device for polymer-based films.

3. The radiation intensity of the ultraviolet radiation device and the transport speed of the polymer base film are positively correlated.

3. The surface treatment device for polymer-based films according to claim 2.

4. The distance from the polymer base film to the ultraviolet radiation device and the transport speed of the polymer base film are negatively correlated.

3. The surface treatment device for polymer-based films according to claim 2.

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