Film-coated aluminum sheet for drilling and preparation method of film-coated aluminum sheet

Abstract

The invention relates to a film-coated aluminum sheet for drilling and a preparation method of the film-coated aluminum sheet, and belongs to the technical field of composite materials. The film-coated aluminum sheet is composed of an aluminum substrate and a film-coated layer, wherein the film-coated layer is prepared from the following components in percentage by weight: 100 parts of modified acrylate oligomer, 18-26 parts of reactive diluent, 5.5-8 parts of ultramicro filler, 1.2-1.6 parts of wetting agent, 0.9-1.3 parts of defoaming agent and 0.5-0.8 part of flatting agent; the preparation method comprises the following steps: by taking a modified acrylate oligomer as a film-forming main material, carrying out amine-ester exchange on diallylamine and methyl trifluoroacetate to prepare an intermediate, carrying out click addition on dithiol and double bonds introduced into the intermediate under the initiation of ultraviolet radiation, and blocking by using hexamethylene diisocyanate to prepare a sulfo-matrix; finally, hydroxyethyl acrylate reacts with terminal isocyanate of a sulfo-matrix, a terminal acrylate structure with photocuring activity is grafted for modification, and the hole site precision and the hole wall quality are effectively improved through a film coating layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to a film-coated aluminum sheet for drilling and a preparation method thereof. Background Art

[0002] Printed circuit boards, critical electronic components in the electronic information industry, serve as the substrate for interconnecting numerous electronic parts and are crucial for implementing a variety of complex circuits, earning them the nickname "the mother of electronic products." Vias are key structures for signal interconnection between circuit board layers. Their function is primarily achieved through micro-hole drilling and hole metallization. Micro-hole processing for circuit boards can be performed mechanically or laser. Laser drilling, however, is generally used for blind vias in high-density interconnect circuit boards and for vias with diameters under 150μm. However, it has significant limitations. Mechanical drilling, with its advantages of high precision, high production efficiency, and low cost, has become the primary method for micro-hole processing in circuit boards.

[0003] The coated aluminum sheet is a functional cover material used in mechanical drilling processing of circuit boards. It is composed of an aluminum alloy sheet and a functional resin material on its surface. The aluminum alloy substrate has certain strength and rigidity, and its texture is relatively uniform, which ensures its basic function as a cover material. The surface resin material has the functions of lubrication, cooling, and guiding, which is the performance guarantee of the coated aluminum sheet as a new cover material; according to the composite formation of the surface resin, it is mainly divided into: thermosetting resin coated aluminum sheet, melt-coated resin coated aluminum sheet and light-curing resin coated aluminum sheet. Among them, the light-curing resin coated aluminum sheet has the advantages of simple production process, high production efficiency and stable product quality, which has attracted great attention. However, the existing light-curing resin coated aluminum sheet has insufficient drilling accuracy and it is difficult to improve the hole wall quality, which greatly limits its development. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a coated aluminum sheet for drilling and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A coated aluminum sheet for drilling, comprising an aluminum substrate and a coating layer, wherein the coating layer comprises the following raw materials in terms of weight percentage:

[0007] 100 parts of modified acrylate oligomer, 18-26 parts of reactive diluent, 5.5-8 parts of ultrafine filler, 1.2-1.6 parts of wetting agent, 0.9-1.3 parts of defoaming agent and 0.5-0.8 parts of leveling agent;

[0008] The modified acrylate oligomer is prepared by the following method:

[0009] Step A1: Methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran are mixed, and dry nitrogen is introduced. Trimethylaluminum is added and mixed thoroughly. The mixture is heated to 30-40°C and stirred at 120-150 rpm for 4-5 hours. Upon completion of the reaction, tetrahydrofuran is removed by rotary evaporation. The substrate is washed with water, separated, and dried under vacuum to obtain an intermediate.

[0010] Furthermore, the feed ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum and anhydrous tetrahydrofuran is 0.1 mol: 0.105-0.11 mol: 25-30 mg: 25-30 mL, and diallylamine and methyl trifluoroacetate undergo amine ester exchange.

[0011] Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, stir at 60-90 rpm at room temperature, and use 150-200 W / m 2 The reaction was carried out under UV irradiation for 6-8 hours, after which the UV irradiation was stopped and the temperature was raised to 40-55°C. Hexamethylene diisocyanate was added and the reaction was continued for 1-1.5 hours. After the reaction was completed, the acetone was removed by rotary evaporation to obtain a thio-based matrix;

[0012] Furthermore, the feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone is 0.1 mol: 0.13-0.15 mol: 40-60 mmol: 15-30 mg: 45-60 mL. Under ultraviolet initiation, ethanedithiol and the double bond of the intermediate undergo click addition, and then the product is capped with hexamethylene diisocyanate.

[0013] Step A3: Mix the thio matrix, hydroxyethyl acrylate, dibutyltin dilaurate, and ethyl acetate, raise the temperature to 60-70° C., and stir at 90-120 rpm for 1.5-2 hours. After the reaction is completed, remove the ethyl acetate by rotary evaporation to obtain a modified acrylate oligomer;

[0014] Furthermore, the feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10g:12-16mmol:5-8mg:25-35mL, and the hydroxyethyl acrylate reacts with the terminal isocyanate of the thiobase to graft the terminal acrylate structure with photocuring activity.

[0015] Furthermore, the active diluent is selected from trifunctional acrylate, which has good cross-linking activity, so that the membrane material has good strength and avoids deformation during the drilling process that causes the drill bit to deviate.

[0016] Furthermore, the ultrafine filler is selected from oleophilic nano-silica, which strengthens the coating layer and changes the refractive index in the coating layer, thereby facilitating diffuse reflection and promoting light curing.

[0017] A method for preparing a film-coated aluminum sheet for drilling, comprising the following steps:

[0018] Step S1: premixing the modified acrylate oligomer and the reactive diluent, adding the remaining raw materials, mixing evenly, and vacuum degassing to obtain a composite slurry;

[0019] Step S2: Repeatedly scrape the composite slurry on the surface of the aluminum substrate and solidify it to form a coating layer on the surface of the aluminum substrate, thereby obtaining a coated aluminum sheet.

[0020] Furthermore, the thickness of the composite slurry after single scraping and curing is no more than 50 μm, which is conducive to sufficient and uniform curing between layers, so that the drill bit is evenly stressed during the drilling process.

[0021] Beneficial effects of the present invention:

[0022] The present invention discloses a light-curing film-coated aluminum sheet. Compared with the existing thermosetting resin film-coated aluminum sheet, melt-coated resin film-coated aluminum sheet, etc., the forming process is simple, the production efficiency is higher, and the quality of the film layer is easy to control. The film layer of the present invention uses a modified acrylate oligomer as the main film-forming material, which is prepared by amine ester exchange of diallylamine and methyl trifluoroacetate to form an intermediate, and then under the initiation of ultraviolet radiation, ethanedithiol and the double bond introduced in the intermediate are click-added, and then hexamethylene diisocyanate is used to block the end to prepare a thiolate matrix, and finally hydroxyethyl acrylate reacts with the terminal isocyanate of the thiolate matrix to graft a light-curing The active end acrylate structure is modified. After curing, a low surface energy fluorine structure is uniformly introduced between the macromolecular chains, weakening the interaction between the acrylate macromolecular chains and making the coating layer softer. It can absorb part of the vibration generated by the drill bit during the drilling process, reduce the drill bit jump, and thus improve the accuracy of the hole position. The sulfur structure on the cured macromolecular main chain forms a lubricating layer with the drill bit surface during the drilling process, effectively reducing the chip removal resistance, and the soft chips are easy to adhere to the chip removal groove of the drill bit, so that the chips are discharged evenly and efficiently, which not only reduces the drill bit jump caused by chips, but also helps to improve the hole wall quality. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Example 1: Preparation of a film-coated aluminum sheet for drilling, specifically as follows:

[0025] (1) Preparation of modified acrylate oligomers

[0026] Step A1: Methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran were mixed, and dry nitrogen was introduced. Trimethylaluminum was added and mixed evenly. The mixture was heated to 40°C and stirred at 150 rpm for 4 h. The feed ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum, and anhydrous tetrahydrofuran was 0.1 mol:0.11 mol:30 mg:30 mL. After the reaction, tetrahydrofuran was removed by rotary evaporation. The substrate was washed with water, separated, and vacuum dried to obtain an intermediate.

[0027] Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, stir at 90 rpm at room temperature, and use 200 W / m 2 The reaction was carried out under ultraviolet irradiation for 6 hours, and then the ultraviolet irradiation was stopped, the temperature was raised to 55°C, and hexamethylene diisocyanate was added to continue the reaction for 1 hour. The feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone was 0.1 mol: 0.15 mol: 60 mmol: 30 mg: 60 mL. After the reaction was completed, the acetone was removed by rotary evaporation to obtain a thio matrix.

[0028] Step A3: Mix the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate, raise the temperature to 70°C, and stir at 120 rpm for 1.5 hours. The feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10 g:16 mmol:8 mg:35 mL. After the reaction is completed, the ethyl acetate is removed by rotary evaporation to obtain a modified acrylate oligomer.

[0029] (2) Preparation of coated aluminum sheet

[0030] Step S1: 100 parts of a modified acrylate oligomer prepared in this embodiment; 18 parts of a reactive diluent selected from trimethylolpropane triacrylate; 8 parts of an ultrafine filler selected from VK-SP30S lipophilic nano-silica; 1.6 parts of a wetting agent selected from ZY-2474 organosilicon wetting agent; 1.3 parts of a defoaming agent selected from ZY-1024 organosilicon defoaming agent; and 0.5 parts of a leveling agent selected from ZY-1857 acrylic leveling agent were taken; the modified acrylate oligomer and the reactive diluent were premixed at 30 rpm for 10 minutes, and then the remaining raw materials were added and mixed for 30 minutes, and vacuum degassing was performed for 1 hour to obtain a composite slurry.

[0031] Step S2: Take a 120 μm thick aluminum substrate, apply the composite slurry on the surface twice for curing, and the thickness of the single application is 30 μm, forming a coating layer on the surface of the aluminum substrate to obtain a coated aluminum sheet.

[0032] Example 2: Preparation of a film-coated aluminum sheet for drilling, specifically as follows:

[0033] (1) Preparation of modified acrylate oligomers

[0034] Step A1: Methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran were mixed, and dry nitrogen was introduced. Trimethylaluminum was added and mixed evenly. The mixture was heated to 30°C and stirred at 120 rpm for 5 h. The feed ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum, and anhydrous tetrahydrofuran was 0.1 mol:0.105 mol:25 mg:25 mL. After the reaction, tetrahydrofuran was removed by rotary evaporation. The substrate was washed with water, separated, and vacuum dried to obtain an intermediate.

[0035] Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, stir at 60 rpm at room temperature, and use 150 W / m 2 The reaction was carried out under ultraviolet irradiation for 8 hours, and then the ultraviolet irradiation was stopped, the temperature was raised to 40°C, and hexamethylene diisocyanate was added to continue the reaction for 1.5 hours. The feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone was 0.1 mol: 0.13 mol: 40 mmol: 15 mg: 45 mL. After the reaction was completed, the acetone was removed by rotary evaporation to obtain a thio matrix.

[0036] Step A3: Mix the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate, raise the temperature to 60°C, and stir at 90 rpm for 2 hours. The feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10 g:12 mmol:5 mg:25 mL. After the reaction, remove the ethyl acetate by rotary evaporation to obtain a modified acrylate oligomer.

[0037] (2) Preparation of coated aluminum sheet

[0038] Step S1: 100 parts of a modified acrylate oligomer prepared in this embodiment; 26 parts of a reactive diluent selected from trimethylolpropane triacrylate; 5.5 parts of an ultrafine filler selected from VK-SP30S lipophilic nano-silica; 1.2 parts of a wetting agent selected from ZY-2474 organosilicon wetting agent; 0.9 parts of a defoaming agent selected from ZY-1024 organosilicon defoaming agent; and 0.8 parts of a leveling agent selected from ZY-1857 acrylic leveling agent were taken; the modified acrylate oligomer and the reactive diluent were premixed at 30 rpm for 10 minutes, and then the remaining raw materials were added and mixed for 30 minutes, and vacuum degassing was performed for 1 hour to obtain a composite slurry.

[0039] Step S2: Take a 120 μm thick aluminum substrate, apply the composite slurry on the surface twice for curing, and the thickness of the single application is 30 μm, forming a coating layer on the surface of the aluminum substrate to obtain a coated aluminum sheet.

[0040] Example 3: Preparation of a film-coated aluminum sheet for drilling, specifically as follows:

[0041] (1) Preparation of modified acrylate oligomers

[0042] Step A1: Methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran were mixed, and dry nitrogen was introduced. Trimethylaluminum was added and mixed evenly. The mixture was heated to 40°C and stirred at 150 rpm for 4.2 h. The feed ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum, and anhydrous tetrahydrofuran was 0.1 mol:0.108 mol:28 mg:30 mL. After the reaction, tetrahydrofuran was removed by rotary evaporation. The substrate was washed with water, separated, and vacuum dried to obtain an intermediate.

[0043] Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, stir at 90 rpm at room temperature, and heat with 170 W / m 2 The reaction was carried out under ultraviolet irradiation for 7 hours, and then the ultraviolet irradiation was stopped, the temperature was raised to 50°C, and hexamethylene diisocyanate was added to continue the reaction for 1.2 hours. The feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone was 0.1 mol: 0.14 mol: 50 mmol: 25 mg: 55 mL. After the reaction was completed, the acetone was removed by rotary evaporation to obtain a thio matrix.

[0044] Step A3: Mix the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate, raise the temperature to 65°C, and stir at 120 rpm for 1.7 hours. The feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10 g:14 mmol:7 mg:30 mL. After the reaction, remove the ethyl acetate by rotary evaporation to obtain a modified acrylate oligomer.

[0045] (2) Preparation of coated aluminum sheet

[0046] Step S1: 100 parts of a modified acrylate oligomer prepared in this embodiment; 20 parts of a reactive diluent selected from trimethylolpropane triacrylate; 6.5 parts of an ultrafine filler selected from VK-SP30S lipophilic nano-silica; 1.3 parts of a wetting agent selected from ZY-2474 organosilicon wetting agent; 1.2 parts of a defoaming agent selected from ZY-1024 organosilicon defoaming agent; and 0.6 parts of a leveling agent selected from ZY-1857 acrylic leveling agent were taken; the modified acrylate oligomer and the reactive diluent were premixed at 30 rpm for 10 minutes, and then the remaining raw materials were added and mixed for 30 minutes, and vacuum degassing was performed for 1 hour to obtain a composite slurry.

[0047] Step S2: Take a 120 μm thick aluminum substrate, apply the composite slurry on the surface twice for curing, and the thickness of the single application is 30 μm, forming a coating layer on the surface of the aluminum substrate to obtain a coated aluminum sheet.

[0048] Example 4: Preparation of a film-coated aluminum sheet for drilling, specifically as follows:

[0049] (1) Preparation of modified acrylate oligomers

[0050] Step A1: Methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran were mixed, and dry nitrogen was introduced. Trimethylaluminum was added and mixed evenly. The mixture was heated to 35°C and stirred at 150 rpm for 4.6 h. The feed ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum, and anhydrous tetrahydrofuran was 0.1 mol:0.108 mol:25 mg:30 mL. After the reaction, tetrahydrofuran was removed by rotary evaporation. The substrate was washed with water, separated, and vacuum dried to obtain an intermediate.

[0051] Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, stir at 90 rpm at room temperature, and heat with 180 W / m 2 The reaction was carried out under ultraviolet irradiation for 6.5 hours, and then the ultraviolet irradiation was stopped, the temperature was raised to 45°C, and hexamethylene diisocyanate was added to continue the reaction for 1.3 hours. The feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone was 0.1 mol: 0.14 mol: 45 mmol: 20 mg: 50 mL. After the reaction was completed, the acetone was removed by rotary evaporation to obtain a thio matrix.

[0052] Step A3: Mix the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate, raise the temperature to 70°C, and stir at 120 rpm for 1.7 hours. The feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10 g:15 mmol:6 mg:30 mL. After the reaction, remove the ethyl acetate by rotary evaporation to obtain a modified acrylate oligomer.

[0053] (2) Preparation of coated aluminum sheet

[0054] Step S1: 100 parts of a modified acrylate oligomer prepared in this embodiment; 23 parts of a reactive diluent selected from trimethylolpropane triacrylate; 7 parts of an ultrafine filler selected from VK-SP30S lipophilic nano-silica; 1.5 parts of a wetting agent selected from ZY-2474 organosilicon wetting agent; 1.1 parts of a defoaming agent selected from ZY-1024 organosilicon defoaming agent; and 0.7 parts of a leveling agent selected from ZY-1857 acrylic leveling agent were taken; the modified acrylate oligomer and the reactive diluent were premixed at 30 rpm for 10 minutes, and then the remaining raw materials were added and mixed for 30 minutes, and vacuum degassing was performed for 1 hour to obtain a composite slurry.

[0055] Step S2: Take a 120 μm thick aluminum substrate, apply the composite slurry on the surface twice for curing, and the thickness of the single application is 30 μm, forming a coating layer on the surface of the aluminum substrate to obtain a coated aluminum sheet.

[0056] Comparative Example 1: This comparison refers to Example 4, except that the modified acrylate oligomer is replaced with B-270 aliphatic polyurethane acrylate provided by Guangdong Boxing New Materials Technology Co., Ltd., and the rest of the implementation process is exactly the same.

[0057] Comparative Example 2: This comparative example selected the NS-1260 film-coated aluminum sheet produced by Shenzhen Liuxin Industrial Co., Ltd.

[0058] The coated aluminum sheet prepared above was used to conduct a drilling test on the circuit board. The standard hole diameter was 0.2 mm, the spindle speed of the drilling machine was 60 krpm, and the feed speed was 25 mm / s. The hole position accuracy and hole wall quality were tested, as shown in Table 1:

[0059] Table 1

[0060]

[0061]

[0062] It can be seen from the test results in Table 1 that the coated aluminum sheet prepared in the embodiment is applied to drilling practice, and the maximum deviation and average deviation of the hole position are both at a low level, the hole position accuracy is higher, the hole roughness is low, the flash is moderate, and the drilling quality is excellent.

[0063] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0064] The above descriptions are merely examples and illustrations of the present invention. Any modifications, additions, or substitutions made by persons skilled in the art to the described embodiments, as long as they do not deviate from the invention or exceed the scope defined by the claims, shall fall within the scope of protection of the present invention. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0065] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A film-coated aluminum sheet for drilling, consisting of an aluminum substrate and a film layer, characterized in that: The coating layer includes the following raw materials according to weight percentage: 100 parts of modified acrylate oligomer, 18-26 parts of reactive diluent, 5.5-8 parts of ultrafine filler, 1.2-1.6 parts of wetting agent, 0.9-1.3 parts of defoaming agent and 0.5-0.8 parts of leveling agent; The modified acrylate oligomer is prepared by the following method: Step A1: Mix methyl trifluoroacetate, diallylamine, and anhydrous tetrahydrofuran, introduce dry nitrogen into the mixture, add trimethylaluminum, mix thoroughly, heat to 30-40°C, and stir for 4-5 hours to obtain an intermediate; Step A2: Mix the intermediate, ethanedithiol, benzoin dimethyl ether and acetone, and apply 150-200W / m 2 Stir and react under UV irradiation for 6-8 hours, then stop UV irradiation, raise the temperature to 40-55°C, add hexamethylene diisocyanate and continue the reaction for 1-1.5 hours to obtain a thio group; Step A3: Mix the thio matrix, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate, heat to 60-70° C., stir and react for 1.5-2 hours to obtain a modified acrylate oligomer.

2. The film-coated aluminum sheet for drilling according to claim 1, characterized in that: The feeding ratio of methyl trifluoroacetate, diallylamine, trimethylaluminum and anhydrous tetrahydrofuran is 0.1 mol: 0.105-0.11 mol: 25-30 mg: 25-30 mL.

3. The film-coated aluminum sheet for drilling according to claim 2, characterized in that: The feed ratio of the intermediate, ethanedithiol, hexamethylene diisocyanate, benzoin dimethyl ether and acetone is 0.1 mol: 0.13-0.15 mol: 40-60 mmol: 15-30 mg: 45-60 mL.

4. The film-coated aluminum sheet for drilling according to claim 3, characterized in that: The feed ratio of the thiobase, hydroxyethyl acrylate, dibutyltin dilaurate and ethyl acetate is 10 g: 12-16 mmol: 5-8 mg: 25-35 mL.

5. The film-coated aluminum sheet for drilling according to claim 1, characterized in that: The reactive diluent is trifunctional acrylate.

6. The film-coated aluminum sheet for drilling according to claim 1, characterized in that: The ultrafine filler is lipophilic nano-silica.

7. The method for preparing a film-coated aluminum sheet for drilling according to any one of claims 1 to 6, characterized in that: The specific steps include: Step S1: premixing the modified acrylate oligomer and the reactive diluent, adding the remaining raw materials, mixing evenly, and vacuum degassing to obtain a composite slurry; Step S2: Repeatedly scrape the composite slurry on the surface of the aluminum substrate and solidify it to form a coating layer on the surface of the aluminum substrate, thereby obtaining a coated aluminum sheet.

8. The method for preparing a film-coated aluminum sheet for drilling according to claim 7, characterized in that: The thickness of the composite slurry after single scraping and curing is not higher than 50μm.

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