Preparation method of 0.01 mm specification aluminum foil for electronic tag

Abstract

The invention belongs to the technical field of non-ferrous metal processing, and relates to a preparation method of a 0.01 mm specification aluminum foil for an electronic tag. In order to solve the problems that an existing 1235 / 1060 alloy electronic tag aluminum foil is high in cost, an 8011 alloy is difficult to process, and the strength of the 8011 alloy does not reach the standard after annealing, the 8011 alloy with specific components is adopted, and the 8011 alloy comprises the following chemical components in percentage by mass: 0.4-0.8% of silicon, 0.5-0.9% of iron, 0.01-0.05% of copper, less than or equal to 0.1% of manganese, less than or equal to 0.05% of magnesium and less than or equal to 0.08% of titanium. The preparation process comprises the steps of cast rolling (5-6 mm cast rolling plate), cold rolling (6 passes and two times of annealing, the blank thickness being 0.1-0.15 mm and the tensile strength being 120-140 MPa), foil rolling (3 passes and rolling finish rolling to 0.01 mm), slitting and gradient annealing (180-200 DEG C). The thickness of the blank is greatly reduced, foil rolling passes are reduced, annealing energy consumption and production cost are reduced, the tensile strength of a finished product is 70-80 MPa, the conductivity is larger than or equal to 37.4 * 10 < 6 > S / m, the etching speed is better than that of 1235 / 1060 alloy, the comprehensive production cost is low, and the method is suitable for large-scale production of electronic tags.

Description

Technical Field

[0001] This invention belongs to the field of non-ferrous metal processing technology, and relates to aluminum foil, and more particularly to a method for preparing aluminum foil for 0.01mm electronic tags. Background Technology

[0002] As a core component of IoT technology, electronic tags require aluminum foil for their internal antennas to possess key characteristics such as thinness (0.01mm level), high conductivity, suitable tensile strength, and good etching performance. Currently, the industry commonly uses 1235 alloy or 1060 alloy as raw materials for electronic tag aluminum foil production, manufactured through a conventional process of "casting and rolling → cold rolling → foil rolling." The finished product typically has a tensile strength of 70-80MPa and a conductivity ≥37.4×10⁻⁶. 6 S / m is sufficient to meet basic usage requirements.

[0003] However, with the rapid development of the electronic tag industry and increasingly fierce market competition, product competition has made companies' demand for production cost control and efficiency improvement more urgent. 1235 and 1060 alloys, as traditional raw materials, have high procurement costs and mature processing technologies, making it difficult to achieve breakthroughs in both cost and quality. Therefore, the industry has attempted to use 8011 alloy, which has lower procurement costs, as an alternative raw material, but faces the following prominent problems in actual production:

[0004] ①The mechanical properties of 8011 alloy mean that the thickness of foil rolling blanks usually needs to be controlled at 0.24-0.3mm, and the tensile strength of the blanks must be ≥180MPa. The excessively high strength and the thick blanks result in high rolling resistance and many processing passes during foil rolling (usually more than 4 passes), which not only prolongs the production cycle, but also significantly increases processing energy consumption and equipment wear, leading to low production efficiency and high processing costs.

[0005] ②The 8011 alloy has a significant work hardening effect. The annealing stage of the finished product requires an extreme high temperature process of 280℃-300℃ to try to reduce the tensile strength. However, even so, the tensile strength of the finished product is still difficult to reduce to the customer's required range of 70-80MPa, which cannot meet the subsequent processing requirements such as bending and cutting during the assembly and use of electronic tags.

[0006] ③ The etching speed of traditional 8011 alloy aluminum foil is generally lower than that of 1235 / 1060 alloy, which limits the processing efficiency of downstream customers in the production of electronic tag antennas and makes it difficult to match the high-speed operation requirements of automated production lines.

[0007] Therefore, developing a method for preparing 0.01mm aluminum foil for electronic tags based on 8011 alloy, while ensuring that the core properties of the finished product, such as conductivity and tensile strength, are no less than those of traditional 1235 / 1060 alloy products, while reducing raw material costs, reducing processing steps, reducing annealing energy consumption, and increasing etching speed, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0008] In view of the shortcomings of existing technologies for producing 0.01mm specification aluminum foil for electronic tags using 8011 alloy, such as large blank thickness, many processing passes, high annealing temperature, difficulty in meeting tensile strength standards, and insufficient etching speed, this invention provides a method for preparing 0.01mm specification aluminum foil for electronic tags.

[0009] Technical solution

[0010] A method for preparing aluminum foil for 0.01mm electronic tags, wherein the aluminum foil uses 8011 alloy as raw material, and achieves a balance of thinness, high performance and low cost by precisely controlling the alloy composition and optimizing the rolling and annealing processes. The method specifically includes the following steps:

[0011] (a) Raw material selection and casting and rolling process (step A)

[0012] Alloy composition restrictions: 8011 alloy is selected as the production raw material, and its alloy chemical composition by mass percentage is as follows: silicon (Si) 0.4~0.8%, iron (Fe) 0.5~0.9%, copper (Cu) 0.01~0.05%, manganese (Mn) ≤0.1%, magnesium (Mg) ≤0.05%, titanium (Ti) ≤0.08%, with the remainder being aluminum (Al) and unavoidable impurities (total impurity content ≤0.15%).

[0013] Reasons for composition restrictions: Controlling the copper content within the range of 0.01~0.05% avoids excessive copper content leading to excessively high alloy strength and increased processing difficulty, while ensuring that the alloy's electrical conductivity is not significantly affected; optimizing the ratio of silicon and iron can improve the alloy's processing plasticity and reduce the risk of cracking during rolling; strict control of manganese and magnesium can prevent them from forming hard and brittle compounds with other elements, affecting the etching performance and surface quality of the aluminum foil; titanium, as a grain refiner, can optimize the grain structure of the cast and rolled billet and improve the uniformity of subsequent rolling.

[0014] Casting and rolling process: The proportioned 8011 alloy raw materials are put into the casting and rolling furnace. After melting, refining, degassing and filtering, the raw materials are cast and rolled through a twin-roll casting and rolling mill. The thickness of the billet at the exit of the casting and rolling mill is controlled to be 5~6mm, the casting and rolling speed is 6~8m / min, and the cooling rate is 15~20℃ / s, so as to obtain a cast and rolled plate with uniform grains and no oxidation defects on the surface.

[0015] (ii) Cold rolling process (step B)

[0016] A six-pass cold rolling process is used to gradually roll a 5-6mm thick cast-rolled sheet into an aluminum foil blank with a thickness of 0.1-0.15mm. The specific process is as follows:

[0017] Pass distribution: Pass 1: 5~6mm → 2.8~3.2mm (reduction rate approximately 47~53%); Pass 2: 2.8~3.2mm → 1.6~1.8mm (reduction rate approximately 43~47%); Pass 3: 1.6~1.8mm → 0.9~1.0mm (reduction rate approximately 44~47%); Pass 4: 0.9~1.0mm → 0.46~0.52mm (reduction rate approximately 49~54%); Pass 5: 0.46~0.52mm → 0.22~0.28mm (reduction rate approximately 52~58%); Pass 6: 0.22~0.28mm → 0.1~0.15mm (reduction rate approximately 50~64%).

[0018] Reasons for the pass design: The gradually increasing reduction rate is adopted to avoid excessive work hardening or surface tearing caused by excessive reduction rate in a single pass, and to ensure uniform material properties after each pass of rolling, laying the foundation for subsequent annealing processes; the total reduction rate of 6 passes reaches 97~98%, which can effectively refine the material grains and improve the processing performance of subsequent foil rolling.

[0019] Annealing process:

[0020] Homogenization annealing: After the second rolling pass, the 1.6~1.8mm thick intermediate billet is homogenized and annealed. The process parameters are: heating to 560~570℃ at a rate of 5~8℃ / min, holding at that temperature for 15~18h, and then cooling to room temperature in the furnace. The purpose is to eliminate the compositional segregation and internal stress of the cast-rolled billet, soften the material, and reduce the rolling resistance of subsequent cold rolling.

[0021] Secondary annealing: After the 6th cold rolling pass, the 0.1~0.15mm thick aluminum foil billet undergoes secondary high-temperature annealing. The process parameters are as follows: heating to 340~380℃ at a rate of 10~15℃ / min, holding at that temperature for 6~10h (holding at that temperature for 2h during the heating stage + holding at that temperature for 4~8h during the isothermal stage + holding at that temperature for 2h during the cooling stage), and then cooling to 250℃ at a rate of 5~10℃ / min before air cooling. After secondary annealing, the tensile strength of the aluminum foil billet is controlled at 120~140MPa, which is 22~33% lower than that of the traditional 8011 alloy billet (tensile strength ≥180MPa). The billet thickness is reduced by 50% compared to the traditional 0.24~0.3mm, which greatly improves the processing conditions for subsequent foil rolling.

[0022] (III) Foil rolling process (Step C)

[0023] A three-pass foil rolling process is used to roll aluminum foil blanks with a thickness of 0.1~0.15mm into finished aluminum foil with a thickness of 0.01mm. The specific process is as follows:

[0024] Pass allocation: Pass 1 (rough rolling): 0.1~0.15mm → 0.045~0.06mm (reduction rate approximately 50~60%); Pass 2 (rough rolling): 0.045~0.06mm → 0.022~0.024mm (reduction rate approximately 49~63%); Pass 3 (finish rolling): 0.022~0.024mm → 0.01mm (reduction rate approximately 50~58%).

[0025] Coiling process: After the second rough rolling pass, two rolls of 0.022~0.024mm thick aluminum foil blanks are double-coiled. During coiling, the alignment accuracy of the two blanks is controlled to be ≤±0.1mm, and the tension is 8~12N / mm. 2 The aluminum foil is then fed into a finishing mill for a third rolling pass. The double-layer process can effectively improve the flatness of the aluminum foil surface and avoid defects such as thin edges or wavy edges during the finishing rolling process.

[0026] Foil rolling parameter control: The rolling speed in the roughing stage is 800~1000m / min, and the rolling speed in the finishing stage is 600~800m / min. The rolling tension is controlled at 5~15N / mm throughout the process. 2 The rolling oil temperature is 30~40℃ to ensure that the aluminum foil does not deviate or tear during the rolling process.

[0027] (iv) Slitting process (step D)

[0028] The qualified 0.01mm thick aluminum foil rolls are fed into the slitting machine and cut into finished rolls of different widths (such as 50mm, 100mm, 1100mm, etc.) according to customer requirements. During the slitting process, the cutting accuracy is controlled to be ≤±0.2mm, and the surface is free of defects such as burrs and scratches. The tension of the slitting rolls is uniform, and there is no loose rolling or overlapping.

[0029] (v) Finished product annealing process (step E)

[0030] A rapid temperature gradient annealing process is used to perform the final heat treatment on the slit aluminum foil to precisely control the tensile strength of the finished product. The specific process is as follows:

[0031] Heating stage: The temperature is increased from room temperature to 80℃ at a rate of 10℃ / h and held for 1 hour. The purpose is to eliminate the local internal stress generated during the cutting process.

[0032] Main annealing stage: Heat to 180~200℃ at a rate of 30℃ / h and hold for 20~48h (adjust according to the weight of the aluminum foil roll; the holding time is extended when the roll weight is large). This stage allows the internal structure of the aluminum foil to recrystallize fully, reducing the tensile strength to the target range.

[0033] Cooling stage: Cool down to 80°C at a rate of 20°C / h, then remove from the furnace and air cool; preferably, cool down to 150°C at a rate of 20°C / h, hold for 10h, and finally cool down to 80°C at a rate of 20°C / h before removing from the furnace and air cooling.

[0034] Process advantages: Compared with the traditional 280~300℃ extreme high temperature annealing of 8011 alloy foil, the present invention adopts medium and low temperature annealing of 180~200℃, which not only reduces energy consumption by 30~40%, but also avoids oxidation and discoloration of aluminum foil surface caused by high temperature, thus improving the appearance quality of the product.

[0035] Beneficial effects

[0036] This invention optimizes alloy composition and innovates rolling and annealing processes. It selects 8011 alloy, which has a procurement cost 10-15% lower than 1235 / 1060 alloy, as raw material, directly reducing raw material procurement costs. The thickness of cold-rolled billets is reduced by 50%, and the number of foil rolling passes is reduced from the traditional 4 passes to 3 passes, shortening the production cycle by 20-25% and reducing equipment wear and processing energy consumption by 25-30%. The finished product annealing temperature is reduced from 280-300℃ to 180-200℃, and the energy consumption of the annealing process is reduced by 30-40%, further reducing the overall production cost. The cold rolling process, through an optimized combination of six rolling passes and two annealing processes, makes the billet properties more suitable for subsequent processing. This reduces rolling resistance and the number of passes during foil rolling, shortening the production time per roll by 15-20%. The aluminum foil produced by this invention achieves an etching rate of 0.035-0.042 mm / min under the same etching conditions (consistent etching solution concentration, temperature, and spray pressure), a 50-70% increase compared to the 0.02-0.03 mm / min of 1235 alloy, significantly improving the antenna manufacturing efficiency for downstream electronic tag companies. The finished product's tensile strength is controlled at 70-80 MPa, fully meeting customer requirements; the conductivity reaches 54.8 × 10⁻⁶. 6 ~56.89×10 6 S / m, far exceeding the industry standard of ≥37.4×10 6S / m ensures stable signal transmission performance of the electronic tag; the aluminum foil surface roughness Ra≤0.1μm, flatness≤0.5mm / m, and the etched pattern edges are neat and burr-free, meeting the manufacturing requirements of high-precision electronic tag antennas; the elongation >2.5% provides good bending toughness, preventing breakage during subsequent assembly. Precise control of copper content in the alloy composition, along with synergistic optimization of rolling passes and annealing processes, ensures product performance fluctuations within the range of ≤±3%, far lower than the industry standard of ±5%, resulting in good process repeatability suitable for large-scale industrial production; the two annealing processes during cold rolling effectively eliminate work hardening and internal stress, reducing the aluminum foil cracking rate during foil rolling to below 0.1%, and increasing the product qualification rate to over 98%, a significant improvement compared to the 90~92% of traditional processes. Detailed Implementation

[0037] The present invention will be described in detail below with reference to embodiments to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following embodiments. Unless otherwise specified, the raw materials and equipment involved in the embodiments are all conventional commercially available products in the art.

[0038] Example 1

[0039] A method for preparing aluminum foil for 0.01mm electronic tags includes the following steps:

[0040] Casting and rolling process: The 8011 alloy raw materials are proportioned as follows by mass percentage: silicon 0.4%, iron 0.5%, copper 0.01%, manganese 0.05%, magnesium 0.03%, titanium 0.06%, with the remainder being aluminum and unavoidable impurities; after being melted and refined in a casting and rolling furnace, the material is cast and rolled through a twin-roll mill at a controlled speed of 6 m / min and a cooling rate of 15℃ / s to obtain a cast and rolled plate with a specification of 5.0 mm × 1100 mm.

[0041] Cold rolling process:

[0042] Cold rolling is performed according to the following pass distribution: 5.0mm → 2.8mm (pass 1) → 1.6mm (pass 2) → 0.9mm (pass 3) → 0.46mm (pass 4) → 0.22mm (pass 5) → 0.1mm (pass 6);

[0043] Homogenization annealing: After the second pass, the 1.6mm thick billet is homogenized and annealed. The process is as follows: heat up to 560℃ at 5℃ / min, hold for 15h, and cool to room temperature in the furnace.

[0044] Secondary annealing: After the 6th pass, the 0.1mm×1100mm cold-rolled coil is subjected to secondary annealing. The process is as follows: the temperature is increased to 340℃ at 10℃ / min, and held for 2h+4h+2h (heating + constant temperature + cooling stage holding), and then cooled to 250℃ at 5℃ / min before being removed from the furnace and air-cooled; after cooling, it is re-rolled and trimmed to 1060mm and delivered to the foil rolling mill.

[0045] Foil rolling process: Rolling is performed in passes of 0.1mm → 0.045mm (first pass roughing) → 0.022mm (second pass roughing) → 0.01mm×2 (third pass finishing). After the second pass, two rolls of 0.022mm thick aluminum foil are joined together, with alignment accuracy controlled at ±0.08mm and tension at 10N / mm. 2 It is fed into a finishing mill and rolled to 0.01mm.

[0046] Slitting process: Slitting into finished rolls 1060mm wide according to customer requirements, with an edge cutting accuracy of ±0.15mm and no burrs or scratches on the surface.

[0047] Annealing process for finished products: The process is as follows: heat up from room temperature to 80℃ at a rate of 10℃ / h and hold for 1 hour; then heat up to 180℃ at a rate of 30℃ / h and hold for 44 hours; finally, cool down to 80℃ at a rate of 20℃ / h and air cool after removal from the furnace.

[0048] Test results: The tensile strength, measured using a universal testing machine, was 78 MPa, and the elongation was 2.8%; the conductivity, measured using an eddy current conductivity meter, was 56.89 × 10⁻⁶. 6 S / m; The etching rate was 0.035 mm / min, measured using an etching test device (etching solution was 30% hydrochloric acid solution, temperature was 25℃, spray pressure was 0.3MPa); Surface roughness Ra=0.08μm, flatness was 0.3mm / m, and the product qualification rate was 98.5%.

[0049] Example 2

[0050] A method for preparing aluminum foil for 0.01mm electronic tags includes the following steps:

[0051] Casting and rolling process: The 8011 alloy raw materials are proportioned as follows by mass percentage: silicon 0.8%, iron 0.9%, copper 0.05%, manganese 0.08%, magnesium 0.05%, titanium 0.08%, with the remainder being aluminum and unavoidable impurities; after being melted and refined in a casting and rolling furnace, the material is cast and rolled through a twin-roll mill at a controlled speed of 8 m / min and a cooling rate of 20℃ / s to obtain a cast and rolled plate with a specification of 6.0 mm × 1100 mm.

[0052] Cold rolling process:

[0053] Cold rolling is performed according to the following pass distribution: 6.0mm → 3.2mm (pass 1) → 1.8mm (pass 2) → 1.0mm (pass 3) → 0.52mm (pass 4) → 0.28mm (pass 5) → 0.15mm (pass 6);

[0054] Homogenization annealing: After the second pass, the 1.8mm thick billet is homogenized and annealed. The process is as follows: heat up to 570℃ at 8℃ / min, hold for 18h, and cool to room temperature in the furnace.

[0055] Secondary annealing: After the 6th pass, the 0.15mm×1100mm cold-rolled coil is subjected to secondary annealing. The process is as follows: the temperature is raised to 380℃ at 15℃ / min, and held for 2h+8h+2h (heating + constant temperature + cooling stage holding), and then cooled to 250℃ at 10℃ / min before being removed from the furnace and air-cooled; after cooling, it is re-rolled and trimmed to 1060mm and delivered to the foil rolling mill.

[0056] Foil rolling process: Rolling is performed in passes of 0.15mm → 0.06mm (first pass roughing) → 0.024mm (second pass roughing) → 0.01mm×2 (third pass finishing). After the second pass, two rolls of 0.024mm thick aluminum foil are joined together, with alignment accuracy controlled at ±0.1mm and tension at 12N / mm. 2 It is fed into a finishing mill and rolled to 0.01mm.

[0057] Slitting process: Slitting into finished rolls 1060mm wide according to customer requirements, with a cutting accuracy of ±0.2mm and no burrs or scratches on the surface.

[0058] Annealing process for finished products: The process is as follows: heat up from room temperature to 80℃ at 10℃ / h and hold for 1h; then heat up to 200℃ at 30℃ / h and hold for 24h; then cool down to 150℃ at 20℃ / h and hold for 10h; finally cool down to 80℃ at 20℃ / h and air cool.

[0059] Test results: The tensile strength, measured using a universal testing machine, was 70 MPa, and the elongation was 3.2%; the conductivity, measured using an eddy current conductivity meter, was 54.8 × 10⁻⁶. 6 S / m; The etching rate was 0.042 mm / min, tested under the same etching test conditions as in Example 1; Surface roughness Ra=0.09 μm, flatness 0.4 mm / m, and product qualification rate 98.2%.

[0060] Comparative Test Example 1

[0061] (Traditional 1235 alloy process)

[0062] Using 1235 alloy as raw material, 0.01mm aluminum foil for electronic tags is prepared according to existing technology. The specific process is as follows: casting and rolling (thickness 6mm) → cold rolling (5 passes, billet thickness 0.2mm, tensile strength 150MPa) → foil rolling (4 passes) → slitting → high temperature annealing (290℃, heat preservation for 20h).

[0063] Test results: Tensile strength 75 MPa, conductivity 38.2 × 10⁻⁶ 6 S / m, etching speed 0.02mm / min, raw material procurement cost is 12% higher than that of Example 1, production cycle is 22% longer than that of Example 1, and annealing energy consumption is 35% higher than that of Example 1.

[0064] Comparative Test Example 2

[0065] (Traditional 8011 alloy process)

[0066] Using 8011 alloy as raw material, 0.01mm aluminum foil for electronic tags is prepared according to existing technology. The specific process is as follows: casting and rolling (thickness 6mm) → cold rolling (4 passes, billet thickness 0.25mm, tensile strength 185MPa) → foil rolling (4 passes) → slitting → high temperature annealing (295℃, heat preservation for 24h).

[0067] Test results: Tensile strength 85MPa (exceeds customer requirements), conductivity 52.1×10⁻⁶. 6 S / m, etching speed 0.028mm / min, production cycle 18% longer than Example 1, annealing energy consumption 38% higher than Example 1, cracking rate during foil rolling 1.2%, product qualification rate 91.5%.

[0068] Analysis of Experimental Results

[0069] A comparison of the detection data from Examples 1 and 2 with those from Comparative Test Examples 1 and 2 shows that:

[0070] The tensile strength (70~78MPa) and electrical conductivity (54.8×10⁻⁶) of the product of this invention are... 6 ~56.89×10 6 Both S / m meet customer requirements, and the conductivity is significantly better than that of traditional 1235 alloy products;

[0071] The etching speed of the product of this invention (0.035~0.042mm / min) is much higher than that of traditional 1235 alloy (0.02mm / min) and traditional 8011 alloy process products (0.028mm / min), which can significantly improve the production efficiency of downstream customers;

[0072] This invention uses 8011 alloy raw materials, which have a raw material cost that is 10-15% lower than that of traditional 1235 alloy. It also reduces the number of foil rolling passes by one, lowers the annealing temperature by 80-115°C, shortens the production cycle by 18-22%, and reduces energy consumption by 30-40%, resulting in a significant reduction in overall production costs. The product qualification rate of this invention's process (98.2%-98.5%) is much higher than that of the traditional 8011 alloy process (91.5%), and the process is more stable, making it suitable for large-scale industrial production.

[0073] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing aluminum foil for 0.01mm electronic tags, characterized in that, Includes the following steps: A. Casting and Rolling: 8011 alloy is selected as raw material. The chemical composition of the 8011 alloy, by mass percentage, is: silicon 0.4~0.8%, iron 0.5~0.9%, copper 0.01~0.05%, manganese ≤0.1%, magnesium ≤0.05%, titanium ≤0.08%, with the remainder being aluminum and unavoidable impurities; a cast-rolled plate with a thickness of 5~6mm is obtained by rolling through a casting and rolling mill. B. Cold rolling: The cast-rolled plate is rolled to a thickness of 0.1~0.15mm in 6 passes, wherein homogenization annealing is performed after the second rolling pass and secondary annealing is performed after the sixth rolling pass to control the tensile strength of the aluminum foil blank to be 120~140MPa. C. Foil rolling: The aluminum foil blank is rolled to 0.01mm in 3 passes, of which the first 2 passes are rough rolling, and after rolling to 0.022~0.024mm, it is coiled and then rolled to finish in the 3rd pass. D. Slitting: Slitting the qualified aluminum foil obtained from foil rolling into the specifications required by the customer; E. Annealing: A gradient annealing process is adopted, specifically: the temperature is raised from room temperature to 80°C in 4 hours and held for 1 hour, then raised to 180~200°C at a rate of 30°C / h and held for 20 hours, and finally cooled to 80°C at a rate of 20°C / h before being removed from the furnace and air-cooled; preferably, during cooling, the temperature is lowered to 150°C at a rate of 20°C / h, held for 10 hours, and finally lowered to 80°C at a rate of 20°C / h before being removed from the furnace and air-cooled.

2. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that: In step A, the casting speed is 6~8 m / min and the cooling rate is 15~20℃ / s.

3. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that, In step B, the process parameters for homogenization annealing are: heating to 560-570°C at a rate of 5-8°C / min, holding at that temperature for 15-18 hours, and then cooling to room temperature in the furnace.

4. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that, In step B, the process parameters for the secondary annealing are as follows: the temperature is increased to 340-380℃ at a rate of 10-15℃ / min, held for 6-10 hours, and then cooled to 250℃ at a rate of 5-10℃ / min before being removed from the furnace and air-cooled.

5. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that, In step B, the rolling thickness distribution for the six passes is as follows: Pass 1: 5~6mm → 2.8~3.2mm; Pass 2: 2.8~3.2mm → 1.6~1.8mm; Pass 3: 1.6~1.8mm → 0.9~1.0mm; Pass 4: 0.9~1.0mm → 0.46~0.52mm; Pass 5: 0.46~0.52mm → 0.22~0.28mm; Pass 6: 0.22~0.28mm → 0.1~0.15mm.

6. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that: In step C, the rolling thickness distribution for the three passes is as follows: Pass 1: 0.1~0.15mm → 0.045~0.06mm, Pass 2: 0.045~0.06mm → 0.022~0.024mm, Pass 3: 0.022~0.024mm → 0.01mm.

7. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that: In step C, the rolling speed in the roughing stage is 800~1000 m / min, and the rolling speed in the finishing stage is 600~800 m / min. During rolling, the tension is controlled at 5~15 N / mm², and the rolling oil temperature is 30~40℃. The coiling process involves joining two rolls of aluminum foil blanks with a thickness of 0.022~0.024 mm. During joining, the alignment accuracy is ≤±0.1 mm, and the tension is controlled at 8~12 N / mm². 2 .

8. The method for preparing aluminum foil for 0.01mm electronic tags according to claim 1, characterized in that: In step E, when the aluminum foil roll is heavy, the heat preservation time at 180~200℃ is extended to 20~48h.

9. Aluminum foil for 0.01mm electronic tags prepared by any one of the methods described in claims 1-8.

10. The aluminum foil for 0.01mm electronic tags according to claim 9, characterized in that, The aluminum foil uses 8011 alloy as the base material. The chemical composition of the 8011 alloy, by mass percentage, is: silicon 0.4~0.8%, iron 0.5~0.9%, copper 0.01~0.05%, manganese ≤0.1%, magnesium ≤0.05%, titanium ≤0.08%, with the remainder being aluminum and unavoidable impurities. The aluminum foil has a thickness of 0.01 mm, a tensile strength of 70~80 MPa, and a conductivity ≥37.4×10⁻⁶. 6 S / m, and under the same etching conditions, the etching rate is not less than 0.035 mm / min, which is better than the etching rate of alloy 1235.