Separation method, recovery method, recovery apparatus, and recovery film roll of composite film material

Abstract

The application relates to a composite film material separation method, a recovery method, a recovery device and a recovery film roll. The separation method comprises the following steps: providing a composite film material, the composite film material comprising a first film layer and a second film layer arranged in a stack, the breaking elongation e1 of the first film layer being greater than the breaking elongation e2 of the second film layer, the composite film material comprising a winding-off end and a stretching end arranged at intervals; and winding the stretching end and unwinding the winding-off end, wherein the pulling speed of the stretching end is greater than the unwinding speed of the winding-off end; so that the first film layer and the second film layer are separated under stress to separate the first film layer and the second film layer. The separation method is simple, safe and environment-friendly.

Description

Technical Field

[0001] This application relates to the field of material recycling technology, specifically to a method for separating composite membrane materials, a recycling method, recycling equipment, and a recycling membrane roll. Background Technology

[0002] Composite membrane materials are current collectors for power batteries, consisting of an intermediate insulating resin layer and two metal layers on either side. Compared to traditional membrane materials, composite membrane materials offer lower metal costs and better safety performance. Chemical agents (such as strong acids) can be used to dissolve the metals in the composite membrane material, thereby separating the metals from the intermediate insulating resin layer and achieving the goal of separating and recovering the metals from the composite membrane material. However, chemical agents such as strong acids are highly hazardous, and the subsequent treatment of the solution is also quite troublesome, potentially causing significant environmental pollution if not handled properly. Furthermore, chemical agents are difficult to dissolve the highly stable metals in composite membrane materials, making the method of dissolving composite membrane materials with chemical agents for metal recovery impractical. Summary of the Invention

[0003] In view of this, this application provides a method for separating, recycling, recycling equipment and recycling membrane roll of composite membrane material. The method for separating, recycling and recycling equipment of composite membrane material can efficiently recover metal substances in composite membrane material, and the recycling process is simple, safe and pollution-free.

[0004] This application provides a method for separating a composite membrane material. The method includes: providing a composite membrane material comprising a first membrane layer and a second membrane layer stacked together, wherein the elongation at break e1 of the first membrane layer is greater than the elongation at break e2 of the second membrane layer, and the composite membrane material comprising an unwinding end and a stretching end spaced apart; and pulling the stretching end and unwinding the unwinding end, wherein the pulling speed of the stretching end is greater than the unwinding speed of the unwinding end, so that the first membrane layer and the second membrane layer are separated by force.

[0005] In the composite membrane material separation method provided in this application, the elongation at break e1 of the first membrane layer is greater than the elongation at break e2 of the second membrane layer. When the stretching end is pulled and the unwinding end is unwound, the composite membrane material is stretched by controlling the pulling speed of the stretching end to be greater than the unwinding speed of the unwinding end. During the stretching process, the first and second membrane layers deform together. As the stretching time increases, because the elongation at break of the first membrane layer is greater than that of the second membrane layer, the difference in deformation between the first and second membrane layers becomes increasingly larger, resulting in a decreasing bonding force between them until the second membrane layer detaches. The first membrane layer is then wound back to the stretching end, thus achieving the separation of the first and second membrane layers. The composite membrane material separation method provided in this application is simple, safe, and pollution-free, and can efficiently separate the first and second membrane layers in the composite membrane material.

[0006] Furthermore, the range of the difference δv between the pulling speed of the stretching end and the unwinding speed of the unwinding end is: 2m / min≤δv≤10m / min.

[0007] In the recycling method provided in this application, when the difference v between the pulling speed of the stretching end and the unwinding speed of the unwinding end satisfies the range 2m / min≤δv≤10m / min, the difference between the pulling speed of the stretching end and the unwinding speed of the unwinding end is within a reasonable range. This results in a large difference between the deformation of the first film layer and the deformation of the second film layer during the stretching process of the composite film material. Consequently, the bonding force between the first film layer and the second film layer is poor, and the second film layer can detach from the first film layer. The first film layer is then wound back to the stretching end, achieving the purpose of separating the first film layer from the second film layer.

[0008] Furthermore, the range of the pulling speed v1 at the stretching end is 5 m / min ≤ v1 ≤ 15 m / min; the range of the unwinding speed v2 at the unwinding end is 1 m / min < v2 ≤ 10 m / min. In the separation method provided in this application, when the pulling speed v1 at the stretching end meets the range of 5 m / min ≤ v1 ≤ 15 m / min, the pulling speed at the stretching end is within a reasonable range, so that during the stretching process of the composite membrane material, the first membrane layer and the second membrane layer can be fully stretched, the second membrane layer can detach from the first membrane layer, and the first membrane layer will not be broken, thus achieving the purpose of separating the first membrane layer and the second membrane layer. When the unwinding speed v2 of the unwinding end meets the range of 0 m / min < v2 ≤ 10 m / min, the speed of the unwinding end is within a reasonable range. The unwinding speed of the unwinding end and the pulling speed of the stretching end can have a certain difference, so that during the stretching process of the composite membrane material, there is a certain difference between the deformation of the first membrane layer and the deformation of the second membrane layer. The bonding force between the first membrane layer and the second membrane layer is relatively poor, thereby achieving the purpose of effectively separating the first membrane layer and the second membrane layer. In addition, the smaller the unwinding speed v2 of the unwinding end, the smaller the fluctuation of the composite membrane material during the stretching process, and the better the effect of separating the second membrane layer from the first membrane layer. However, correspondingly, the separation efficiency of the first membrane layer and the second membrane layer is lower.

[0009] Furthermore, the value range of the difference δe between the elongation at break of the first film layer e1 and the elongation at break of the second film layer is: 35% ≤ δe ≤ 155%.

[0010] When the difference δe between the elongation at break of the first film layer e1 and the elongation at break of the second film layer satisfies the range of 35% ≤ δe ≤ 155%, and when the pulling speed of the stretching end and the unwinding speed of the unwinding end are within a reasonable range, the difference between the deformation of the first film layer and the deformation of the second film layer is large enough during the stretching process of the composite film material, so that the bonding force between the first film layer and the second film layer is small, which is conducive to the second film layer falling off the first film layer, so as to achieve the purpose of separating the first film layer and the second film layer.

[0011] Furthermore, the elongation at break e1 of the first film layer ranges from 60% to 150%; the elongation at break e2 of the second film layer ranges from 1% to 20%.

[0012] When the elongation at break e1 of the first film layer is within the range of 60% ≤ e1 ≤ 150%, the elongation at break of the first film layer is within a reasonable range. This allows the first film layer to have a large deformation during the stretching process of the composite film, which facilitates the detachment of the second film layer from the first film layer. The first film layer is not easily broken and can be properly wound up, thus achieving the purpose of separating the first and second film layers. When the elongation at break e2 of the second film layer is within the range of 1% ≤ e2 ≤ 20%, the elongation at break of the second film layer is within a reasonable range. This allows the second film layer to have a small deformation during the stretching process of the composite film, which facilitates a larger difference between the deformation of the second and first film layers, resulting in a smaller adhesion force between the two layers, which is beneficial for the second film layer to detach from the first film layer.

[0013] This application also provides a method for recycling composite membrane materials, the recycling method including the separation method of the composite membrane materials provided in this application and suctioning air on the side of the second membrane layer away from the first membrane layer to separate and recycle the second membrane layer, and recycling the first membrane layer on the side of the stretched end.

[0014] In the recycling method provided in this application, the first membrane layer and the second membrane layer are stacked. During the stretching process of the composite membrane material, there is a difference in the deformation of the first membrane layer and the deformation of the second membrane layer. The second membrane layer falls off the first membrane layer. Air is drawn on the side of the second membrane layer away from the first membrane layer, which is conducive to separating and recycling the second membrane layer. The first membrane layer is then wound up and recycled on the stretching end side, thereby achieving the purpose of separating and recycling the first membrane layer and the second membrane layer.

[0015] Furthermore, the first film layer is a polymer, and the second film layer is a metal or alloy; the adhesive force α between the first and second film layers ranges from 1 N / cm ≤ α ≤ 10 N / cm. The elongation at break of the polymer layer differs significantly from that of the metal layer, and also significantly from that of the alloy layer. This results in a large difference in deformation between the first and second film layers during the stretching process, leading to a weaker adhesive force between them and facilitating the detachment of the second film layer from the first. When the adhesive force α between the first and second film layers satisfies the range of 1 N / cm ≤ α ≤ 10 N / cm, the adhesive force α is within a reasonable range, enabling the composite film material to separate from the first and second film layers during stretching.

[0016] Furthermore, the second membrane layer consists of two layers, which are respectively disposed on two surfaces opposite to the first membrane layer. Air is drawn in from both sides of the first membrane layer to separate and recover the second membrane layer, and the first membrane layer is recovered from one side of the stretched end.

[0017] The composite membrane material provided in this application includes two second membrane layers and one first membrane layer, which are sequentially stacked. When recycling the first and second membrane layers of the composite membrane material, the two second membrane layers will detach from the first membrane layer. By suctioning air from both sides of the first membrane layer, the second membrane layers are separated from and recycled. The first membrane layer is recycled from one side of the stretched end, thereby achieving the purpose of separating and recycling the first and second membrane layers.

[0018] This application also provides a recycling device for recycling the composite membrane material provided in this application. The recycling device includes a stretching device, an unwinding device, and an air suction device. The stretching device is used to set the stretching end of the composite membrane material and to wind up the first membrane layer. The unwinding device is spaced apart from the stretching device and is used to set the unwinding end of the composite membrane material and to unwind the composite membrane material. The air suction device is located on the side of the first membrane layer close to the second membrane layer in the thickness direction and is used to adsorb and peel off the second membrane layer.

[0019] The composite membrane material is recycled using the recycling equipment provided in this application. The unwinding end of the composite membrane material is positioned on an unwinding device, and the stretching end is positioned on a stretching device. When the stretching speed of the stretching device is greater than the unwinding speed of the unwinding device, the composite membrane material is subjected to stretching. During the stretching process, the elongation at break of the first membrane layer is greater than that of the second membrane layer, resulting in different deformations between the first and second membrane layers. As the stretching time increases, the difference in deformation between the first and second membrane layers becomes increasingly larger, leading to a decrease in the bonding force between them, causing the second membrane layer to detach from the first membrane layer. An air suction device is positioned on the side of the first membrane layer closer to the second membrane layer in the thickness direction to adsorb and peel the second membrane layer from the first membrane layer, thus recycling the second membrane layer. The first membrane layer is then wound back into the stretching device, achieving separation and recycling of the first and second membrane layers.

[0020] Furthermore, the distance d between the stretching device and the unwinding device ranges from 1m to 2m.

[0021] When the distance d between the stretching device and the unwinding device is within the range of 1m ≤ d ≤ 2m, the distance d is within a reasonable range. This allows the composite film to be fully stretched per unit time when the stretching speed of the stretching device is greater than the unwinding speed of the unwinding device. The deformation of the second film layer is sufficiently different from that of the first film layer, resulting in a decreasing bonding force between the first and second film layers. This allows the second film layer to detach from the first film layer, thereby achieving the purpose of separating the first and second film layers.

[0022] Furthermore, there are two air-suction devices, which are disposed on both sides of the thickness direction of the first film layer. In other words, the two air-suction devices are respectively disposed on opposite sides of the composite film material.

[0023] The recycling device of this application includes two suction devices, such that when the composite membrane material has two second membrane layers and a second membrane layer is respectively disposed on the two opposite surfaces of the first membrane layer, the suction devices can adsorb and recycle the second membrane layers disposed on the two opposite surfaces of the first membrane layer, which is beneficial to improving the recycling rate of the second membrane layer of the recycling device.

[0024] Furthermore, the negative pressure β of the suction device ranges from 10 mbar to 260 mbar, and the airflow γ of the suction device ranges from 2000 m³ / h. 3 / h≤γ≤20000m 3 / h.

[0025] When the negative pressure β of the suction device is in the range of 10 mbar ≤ β ≤ 260 mbar, and the air volume γ of the suction device is in the range of 2000 m... 3 / h≤γ≤20000m 3 / h, the negative pressure β and air volume γ of the suction device are within a reasonable range, so that the suction device can adsorb and recover the second membrane layer that falls off the first membrane layer in time, without breaking the composite membrane material.

[0026] This application also provides a recyclable membrane roll, which is made by the recycling method of the composite membrane material provided in this application. The length of the composite membrane material is a, and the length of the recyclable membrane roll is b, which satisfies the condition: 1.6a≤b≤2.5a.

[0027] The recycled membrane roll provided in this application is made from composite membrane material using the recycling method provided in this application. During the separation process of the composite membrane material 100, the composite membrane material is stretched so that the length b of the recycled membrane roll satisfies the condition: 1.6a≤b≤2.5a.

[0028] In the composite membrane material recycling method provided in this application, the elongation at break e1 of the first membrane layer is greater than the elongation at break e2 of the second membrane layer. When the stretching end is wound up and the unwinding end is unwound, the composite membrane material is stretched by controlling the pulling speed of the stretching end to be greater than the unwinding speed of the unwinding end. During the stretching process, the first and second membrane layers deform together. As the stretching time increases, because the elongation at break of the first membrane layer is greater than that of the second membrane layer, the difference in deformation between the first and second membrane layers becomes increasingly larger, resulting in a decreasing bonding force between them until the second membrane layer detaches. The first membrane layer is then wound back up to the stretching end, achieving the separation and recycling of the first and second membrane layers. The composite membrane material separation method provided in this application is simple, safe, and pollution-free, and can efficiently separate the first and second membrane layers in the composite membrane material. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic flowchart of a method for recycling composite membrane materials according to one embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the composite membrane material in one embodiment of this application;

[0032] Figure 3 The composite membrane material in one embodiment of this application is along Figure 1 A cross-sectional view along the AA direction;

[0033] Figure 4 The composite membrane material in another embodiment of this application Figure 1 A cross-sectional view along the AA direction;

[0034] Figure 5 This is a schematic flowchart of a method for recycling composite membrane materials according to another embodiment of this application.

[0035] Figure 6 This is a schematic diagram of the structure of a recycling device according to one embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the structure of a recycling device according to another embodiment of this application;

[0037] Figure 8This is a schematic diagram of the structure of the composite membrane material according to one embodiment of this application;

[0038] Figure 9 This is a schematic diagram of the structure of a recyclable membrane roll according to one embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-Composite membrane material, 110-First membrane layer, 130-Second membrane layer, 150-Unwinding end, 170-Stretching end, 200-Recycling equipment, 210-Stretching device, 230-Unwinding device, 250-Suction device, 270-Shell, 271-First through groove, 273-Second through groove, 290-Recycling chamber, 300-Recycled membrane roll. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0043] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] Composite membrane materials are commonly used current collectors in power batteries. To recover metals from composite membrane materials, chemical agents (such as strong acids) can be used to dissolve the metals, thereby separating them from the intermediate insulating resin layer. However, chemical agents such as strong acids are highly hazardous, and the subsequent solution treatment is also quite troublesome, potentially causing significant environmental pollution if not handled properly. Furthermore, chemical agents are difficult to dissolve the highly stable metals in composite membrane materials, making the method of using chemical agents to dissolve composite membrane materials for metal recovery impractical.

[0045] Please see Figures 1 to 3 ,as well as Figure 8 This application provides a method for separating a composite membrane material 100, the method comprising:

[0046] S101, a composite membrane material 100 is provided, the composite membrane material 100 includes a first membrane layer 110 and a second membrane layer 130 stacked together, the elongation at break e1 of the first membrane layer 110 is greater than the elongation at break e2 of the second membrane layer 130, and the composite membrane material 100 includes an unwinding end 150 and a stretching end 170 spaced apart.

[0047] Understandably, elongation at break refers to the ratio of the length of a material after being stretched to its original length when subjected to external force until it breaks, expressed as a percentage. The elongation at break e1 of the first film layer 110 is the ratio of the elongation of the first film layer 110 to its original length when the composite film 100 breaks, i.e., e1 = (elongation of the first film layer 110 / original length of the first film layer 110) × 100%; the elongation at break e2 of the second film layer 130 is the ratio of the elongation of the second film layer 130 to its original length when the composite film 100 breaks, i.e., e2 = (elongation of the second film layer 130 / original length of the second film layer 130) × 100%.

[0048] S102, the stretching end 170 is pulled out and the unwinding end 150 is unwound, wherein the pulling speed of the stretching end 170 is greater than the unwinding speed of the unwinding end 150, so that the first film layer 110 and the second film layer 130 are separated by force.

[0049] Understandably, if the pulling speed of the stretching end 170 is greater than the unwinding speed of the unwinding end 150, then when the stretching end 170 is pulling and the unwinding end 150 is unwinding, the composite film 100 will be stretched, and the first film layer 110 and the second film layer 130 will be subjected to tensile force along the arrangement direction of the stretching end 170 and the unwinding end 150.

[0050] In the embodiments of this application, the elongation at break of the first film layer 110 is greater than that of the second film layer 130. When the stretching end 170 is wound up and the unwinding end 150 is unwound, by controlling the pulling speed of the stretching end 170 to be greater than the unwinding speed of the unwinding end 150, the composite film 100 is stretched during the pulling and unwinding process. During the stretching process, the first film layer 110 and the second film layer 130 deform together. As the stretching time increases, since the elongation at break of the first film layer 110 is greater than that of the second film layer 130, the difference in deformation between the first film layer 110 and the second film layer 130 becomes larger and larger, resulting in a decrease in the bonding force between the first film layer 110 and the second film layer 130 until the second film layer 130 detaches. The first film layer 110 is then wound up to the stretching end 170 to achieve the purpose of separating the first film layer 110 from the second film layer 130. The separation method of the composite membrane 100 provided in this application is simple, safe and pollution-free, and can efficiently separate the first membrane layer 110 and the second membrane layer 130 in the composite membrane 100.

[0051] Optionally, in some embodiments, the first film layer 110 is a polymer and the second film layer 130 is a metal or alloy.

[0052] In the embodiments of this application, the material of the first film layer 110 is selected from at least one of polypropylene, polyethylene terephthalate, polyethylene, and epoxy resin; the material of the second film layer 130 is selected from at least one of copper, aluminum, silver, and gold. In other words, the material of the second film layer 130 can be, but is not limited to, copper, aluminum, silver, gold, copper-aluminum alloy, and copper-silver alloy. The elongation at break of the polymer layer differs significantly from that of the metal layer, and also differs significantly from that of the alloy layer. This results in a significant difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 during the stretching process of the composite film material 100. This reduces the adhesion between the first film layer 110 and the second film layer 130, facilitating the detachment of the second film layer 130 from the first film layer 110.

[0053] Optionally, the adhesive force α between the first film layer 110 and the second film layer 130 is in the range of 1 N / cm ≤ α ≤ 10 N / cm. Specifically, the adhesive force α between the first film layer 110 and the second film layer 130 can be, but is not limited to, 1 N / cm, 1.5 N / cm, 2 N / cm, 3 N / cm, 4 N / cm, 4.5 N / cm, 5 N / cm, 6 N / cm, 7 N / cm, 8 N / cm, 9 N / cm, 9.5 N / cm, and 10 N / cm.

[0054] In the embodiments of this application, when the adhesive force α between the first film layer 110 and the second film layer 130 satisfies the range of 1 N / cm ≤ α ≤ 10 N / cm, the adhesive force α between the first film layer 110 and the second film layer 130 is within a reasonable range, enabling the composite film material 100 to separate the first film layer 110 and the second film layer 130 during the stretching process. When the adhesive force α between the first film layer 110 and the second film layer 130 is greater than 10 N / cm, the adhesive force between the first film layer 110 and the second film layer 130 is too large, making it difficult for the first film layer 110 and the second film layer 130 to separate during the stretching process, thus making it difficult to achieve the purpose of separating the second film layer 130.

[0055] In some embodiments, the difference v between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 ranges from 2 m / min to 10 m / min. Specifically, the difference δv between the pulling speed of the take-up section and the unwinding speed of the unwinding end 150 can be, but is not limited to, 2 m / min, 2.4 m / min, 3 m / min, 3.5 m / min, 4 m / min, 4.5 m / min, 5 m / min, 5.6 m / min, 6 m / min, 6.5 m / min, 7 m / min, 8 m / min, 9 m / min, and 10 m / min.

[0056] In the embodiments of this application, when the difference δv between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 satisfies the range of 2m / min≤δv≤10m / min, the difference between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 is within a reasonable range. This results in a large difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 during the stretching process of the composite film material 100. Consequently, the bonding force between the first film layer 110 and the second film layer 130 is poor, and the second film layer 130 can detach from the first film layer 110. The first film layer 110 is then wound back to the stretching end 170, achieving the purpose of separating the first film layer 110 and the second film layer 130. When the difference between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 is greater than 10 m / min, the difference between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 is too large. In this case, during the stretching process of the composite membrane material 100, the first membrane layer 110 and the second membrane layer 130 are subjected to excessive longitudinal stretching. Both the first membrane layer 110 and the second membrane layer 130 are easily broken, which stops the separation process of the composite membrane material 100 and reduces the efficiency of separating the composite membrane material 100. When the difference between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 is less than 2 m / min, the difference between the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 is relatively small. Therefore, during the stretching process of the composite film material 100, the difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 is relatively small. The first film layer 110 and the second film layer 130 still have a strong bonding force, making it difficult for the second film layer 130 to detach from the first film layer 110, and making it difficult to achieve the purpose of separating the first film layer 110 and the second film layer 130.

[0057] Optionally, the pulling speed v1 of the stretching end 170 can be in the range of 5 m / min ≤ v1 ≤ 15 m / min. Specifically, the pulling speed v1 of the stretching end 170 can be, but is not limited to, 5 m / min, 6 m / min, 7 m / min, 7.5 m / min, 8 m / min, 9 m / min, 10 m / min, 11 m / min, 12 m / min, 13 m / min, 13.5 m / min, 14 m / min, and 15 m / min.

[0058] In the embodiments of this application, when the value of the pulling speed v1 of the stretching end 170 satisfies the range of 5m / min≤v1≤15m / min, the pulling speed of the stretching end 170 is within a reasonable range, so that during the stretching process of the composite membrane material 100, the first membrane layer 110 and the second membrane layer 130 can be fully stretched, the second membrane layer 130 can be detached from the first membrane layer 110, and the first membrane layer 110 will not be broken, thus achieving the purpose of separating the first membrane layer 110 and the second membrane layer 130. When the pulling speed v1 of the stretching end 170 is greater than 15 m / min, the pulling speed of the stretching end 170 is too fast. When the composite membrane 100 is stretched, the second membrane layer 130 has not yet had time to detach from the first membrane layer 110 before being wound up to the stretching end 170. In addition, the excessively fast winding speed results in excessive winding tension of the composite membrane 100. The first membrane layer 110 fluctuates greatly during the stretching process and is prone to breakage, affecting the continuation of the recycling process and making it difficult to achieve the purpose of separating the first membrane layer 110 from the second membrane layer 130. When the pulling speed v1 of the stretching end 170 is less than 5 m / min, the pulling speed of the stretching end 170 is too low. The stretching process of the composite membrane 100 is more stable, and the separation effect of the first membrane layer 110 from the second membrane layer 130 is better. However, the pulling speed of the winding section is too low, resulting in low stretching efficiency of the composite membrane 100.

[0059] Optionally, the unwinding speed v2 of the unwinding end 150 can be in the range of 1 m / min < v2 ≤ 10 m / min. Specifically, the value of the unwinding speed v2 of the unwinding end 150 can be, but is not limited to, 1.2 m / min, 2 m / min, 2.5 m / min, 3 m / min, 4 m / min, 5 m / min, 6 m / min, 7 m / min, 8 m / min, 8.5 m / min, 9 m / min, and 10 m / min.

[0060] Understandably, during the recycling process of the composite membrane 100, the composite membrane 100 is subjected to a stretching action, and the unwinding end 150 is passively rotated by the pulling action of the stretching end 170.

[0061] In the embodiments of this application, when the unwinding speed v2 of the unwinding end 150 satisfies the range 1m / min < v2 ≤ 10m / min, the speed of the unwinding end 150 is within a reasonable range. The unwinding speed of the unwinding end 150 and the pulling speed of the stretching end 170 can have a certain difference, so that during the stretching process of the composite membrane material 100, there is a certain difference between the deformation of the first membrane layer 110 and the deformation of the second membrane layer 130. The bonding force between the first membrane layer 110 and the second membrane layer 130 is relatively poor, thereby achieving the purpose of effectively separating and recovering the first membrane layer 110 and the second membrane layer 130. In addition, the smaller the unwinding speed v2 of the unwinding end 150, the smaller the fluctuation of the composite membrane material 100 during the stretching process, and the better the effect of separating the second membrane layer 130 from the first membrane layer 110. However, correspondingly, the separation efficiency of the first membrane layer 110 and the second membrane layer 130 is relatively low. When the unwinding speed v2 of the unwinding end 150 is greater than 10 m / min, the unwinding speed of the unwinding end 150 is too high. This results in a smaller difference between the speed of the unwinding end 150 and the speed of the stretching end 170. Consequently, during the stretching process of the composite membrane material 100, the difference between the deformation of the first membrane layer 110 and the deformation of the second membrane layer 130 is small. The first membrane layer 110 and the second membrane layer 130 still have a strong bonding force, making it difficult for the second membrane layer 130 to detach from the first membrane layer 110, thus hindering the separation of the first membrane layer 110 and the second membrane layer 130. Furthermore, the excessively high unwinding speed v2 of the unwinding end 150 causes the composite membrane material 100 to experience significant tensile tension during the stretching process. This results in greater fluctuations in the composite membrane material 100 during stretching, which can easily lead to the first membrane layer 110 and the second membrane layer 130 breaking, thus halting the recycling process.

[0062] In some embodiments, the difference δe between the elongation at break e1 of the first film layer 110 and the elongation at break e2 of the second film layer 130 ranges from 35% to 155%. Specifically, the difference δe between the elongation at break of the first film layer 110 and the elongation at break of the second film layer 130 can be, but is not limited to, 35%, 40%, 45%, 50%, 65%, 78%, 85%, 90%, 100%, 110%, 125%, 135%, 140%, 145%, and 155%.

[0063] In the embodiments of this application, when the difference δ between the elongation at break of the first film layer 110 and the elongation at break of the second film layer 130 satisfies the range of 35% ≤ δe ≤ 155%, and when the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 are within a reasonable range, the difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 is sufficiently large during the stretching process of the composite film material 100. This results in a smaller bonding force between the first film layer 110 and the second film layer 130, which facilitates the detachment of the second film layer 130 from the first film layer 110, thereby achieving the purpose of separating the first film layer 110 and the second film layer 130. When the difference δe between the elongation at break of the first film layer 110 and the elongation at break of the second film layer 130 is greater than 155%, the bonding force between the first film layer 110 and the second film layer 130 is weak, making it difficult for the composite film material 100 to be put into practical application. When the difference δe between the elongation at break of the first film layer 110 and the elongation at break of the second film layer 130 is less than 35%, and when the pulling speed of the stretching end 170 and the unwinding speed of the unwinding end 150 are within a reasonable range, the difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 is relatively small during the stretching process of the composite film material 100. This results in a strong bonding force between the first film layer 110 and the second film layer 130, making it difficult for the second film layer 130 to detach from the first film layer 110, and ultimately making it difficult to achieve the purpose of separating the first film layer 110 and the second film layer 130.

[0064] Optionally, the elongation at break e1 of the first film layer 110 is in the range of 60% ≤ e1 ≤ 150%. Specifically, the elongation at break e1 of the first film layer 110 can be, but is not limited to, 60%, 65%, 70%, 78%, 80%, 90%, 100%, 110%, 120%, 130%, 140%, 145%, and 150%.

[0065] In the embodiments of this application, when the elongation at break e1 of the first film layer 110 is within the range of 60% ≤ e1 ≤ 150%, the elongation at break of the first film layer 110 is within a reasonable range. This allows the first film layer 110 to have a large deformation during the stretching process of the composite film material 100, which facilitates the detachment of the second film layer 130 from the first film layer 110. The first film layer 110 is not easily broken and can be normally wound up, thus achieving the purpose of separating the first film layer 110 from the second film layer 130. When the elongation at break e1 of the first film layer 110 is greater than 150%, the first film layer 110 contains various polymer molecules, and the bonding force between the first film layer 110 and the second film layer 130 is weak, making the composite film material 100 difficult to apply in practical applications. When the elongation at break e1 of the first film layer 110 is less than 60%, the difference between the elongation at break of the first film layer 110 and the elongation at break of the second film layer 130 is small. This makes the difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 small during the stretching process of the composite film material 100. As a result, the second film layer 130 is difficult to detach from the first film layer 110, and thus it is difficult to achieve the purpose of separating the first film layer 110 and the second film layer 130.

[0066] Optionally, the elongation at break e2 of the second film layer 130 is in the range of 1% ≤ e2 ≤ 20%. Specifically, the elongation at break δ2 of the second film layer 130 can be, but is not limited to, 1%, 2%, 3%, 5%, 6%, 8%, 10%, 11%, 12%, 14%, 15%, 16%, 17%, 18%, 19%, and 20%.

[0067] In the embodiments of this application, when the elongation at break e2 of the second film layer 130 is within the range of 1% ≤ e2 ≤ 20%, the elongation at break of the second film layer 130 is within a reasonable range. This allows the second film layer 130 to have a smaller deformation during the stretching process of the composite film material 100. This, in turn, helps to make the difference between the deformation of the second film layer 130 and the deformation of the first film layer 110 larger, resulting in a smaller adhesive force between the second film layer 130 and the first film layer 110, which facilitates the detachment of the second film layer 130 from the first film layer 110. When the elongation at break e2 of the second film layer 130 is greater than 20%, the difference between the elongation at break of the second film layer 130 and the elongation at break of the first film layer 110 is smaller. This results in a smaller difference between the deformation of the first film layer 110 and the deformation of the second film layer 130 during the stretching process of the composite film material 100, making it difficult for the second film layer 130 to detach from the first film layer 110. Therefore, it becomes difficult to achieve the goal of separating the first membrane layer 110 from the second membrane layer 130.

[0068] Please see Figure 5 In some embodiments, the recycling method of the composite membrane 100 includes:

[0069] S201, a composite membrane material 100 is provided, the composite membrane material 100 includes a first membrane layer 110 and a second membrane layer 130 stacked together, the elongation at break e1 of the first membrane layer 110 is greater than the elongation at break e2 of the second membrane layer 130, and the composite membrane material 100 includes an unwinding end 150 and a stretching end 170 spaced apart.

[0070] S202, the stretching end 170 is pulled out and the unwinding end 150 is unwound, wherein the pulling speed of the stretching end 170 is greater than the unwinding speed of the unwinding end 150, so that the first film layer 110 and the second film layer 130 are separated by force.

[0071] S203, air is drawn in on the side of the second membrane layer 130 away from the first membrane layer 110 to separate and recover the second membrane layer 130, and the first membrane layer 110 is recovered on the side of the stretching end 170.

[0072] In the embodiments of this application, the first film layer 110 and the second film layer 130 are stacked. During the stretching process of the composite film 100, the first film layer 110 and the second film layer 130 are subjected to tensile force along the arrangement direction of the stretching end 170 and the unwinding end 150. The deformation of the first film layer 110 differs from that of the second film layer 130, resulting in a decrease in the bonding force between them. Consequently, the second film layer 130 detaches from the first film layer 110, thus separating the first film layer 110 and the second film layer 130. Suction is applied to the side of the second film layer 130 facing away from the first film layer 110, which facilitates the adsorption of the second film layer 130 detached from the first film layer 110, achieving the purpose of separating and recovering the second film layer 130. The first film layer 110 is wound up and recovered on the stretching end 170 side. The recovery method of this embodiment allows the first film layer 110 and the second film layer 130 to be separated and recovered.

[0073] Please see Figure 4 In some embodiments, the second membrane layer 130 consists of two layers, respectively disposed on two surfaces opposite to the first membrane layer 110. Air is drawn in from both sides of the first membrane layer 110 to separate and recover the second membrane layer 130, and the first membrane layer 110 is recovered from one side of the stretching end 170.

[0074] In an embodiment of this application, the composite membrane 100 includes two second membrane layers 130 and one first membrane layer 110, which are sequentially stacked. When separating the first membrane layer 110 and the second membrane layer 130 of the composite membrane 100, the two second membrane layers 130 detach from the first membrane layer 110, thereby separating the first membrane layer 110 from the second membrane layer 130. Air is drawn from both sides of the first membrane layer 110 to peel and recycle the second membrane layer 130, and the first membrane layer 110 is recovered from one side of the stretching end 170.

[0075] Please see Figure 6 and Figure 7 This application embodiment also provides a recycling device 200, which is used to recycle the composite membrane material 100 provided in this application. The recycling device 200 includes a stretching device 210, an unwinding device 230, and an air suction device 250. The stretching device 210 is used to set the stretching end 170 of the composite membrane material 100 and to wind up the first membrane layer 110. The unwinding device 230 is spaced apart from the stretching device 210 and is used to receive the composite membrane material 100 and to unwind the composite membrane material 100. The air suction device 250 is disposed on the side of the first membrane layer 110 close to the second membrane layer 130 in the thickness direction and is used to adsorb and peel off the second membrane layer 130.

[0076] Understandably, the thickness direction of the first film layer 110 is the stacking direction of the first film layer 110 and the second film layer 130.

[0077] Understandably, the first film layer 110 wound up by the stretching device 210 is a recycled film roll 300.

[0078] The composite membrane material 100 is recycled using the recycling equipment 200 provided in this application embodiment. The unwinding end 150 of the composite membrane material 100 is disposed in the unwinding device 230, and the stretching end 170 of the composite membrane material 100 is disposed in the stretching device 210. When the pulling speed of the stretching device 210 is greater than the unwinding speed of the unwinding device 230, the composite membrane material 100 is subjected to a stretching force along the arrangement direction of the stretching device 210 and the unwinding device 230. During the stretching process of the composite membrane 100, the elongation at break of the first membrane layer 110 is greater than that of the second membrane layer 130. The deformation of the first membrane layer 110 and the second membrane layer 130 differs. As the stretching time increases, the difference in deformation between the first membrane layer 110 and the second membrane layer 130 becomes increasingly larger, resulting in a weaker bonding force between them. Consequently, the second membrane layer 130 will detach from the first membrane layer 110. The suction device 250 is positioned on the side of the first membrane layer 110 closer to the second membrane layer 130 in the thickness direction. The suction device 250 is used to adsorb the second membrane layer 130 that has detached from the first membrane layer 110, thereby achieving the separation and recovery of the second membrane layer 130. The first membrane layer 110 is then wound up and recovered to the stretching device 210. The recovery device 200 achieves the separation and recovery of the first membrane layer 110 and the second membrane layer 130.

[0079] In the recycling device 200 provided in this application embodiment, when the recycling device 200 is used to recycle the composite membrane material 100, the pulling speed of the stretching device 210 is the same as the pulling speed of the stretching end 170, and the unwinding speed of the unwinding device 230 is the same as the unwinding speed of the unwinding end 150.

[0080] In some embodiments, the distance d between the stretching device 210 and the unwinding device 230 ranges from 1m to 2m. Specifically, the value of the distance d between the stretching device 210 and the unwinding device 230 can be, but is not limited to, 1m, 1.1m, 1.2m, 1.3m, 1.5m, 1.6m, 1.7m, 1.8m, 1.9m, and 2m.

[0081] In the embodiments of this application, when the distance d between the stretching device 210 and the unwinding device 230 is within the range of 1m ≤ d ≤ 2m, the distance d between the stretching device 210 and the unwinding device 230 is within a reasonable range. This allows the composite film 100 to be fully stretched per unit time when the stretching speed of the stretching device 210 is greater than the unwinding speed of the unwinding device 230. The deformation of the second film layer 130 is sufficiently different from that of the first film layer 110, resulting in a decreasing bonding force between the first film layer 110 and the second film layer 130. This allows the second film layer 130 to detach from the first film layer 110, thereby achieving the purpose of separating and recycling the first film layer 110 and the second film layer 130. When the distance d between the stretching device 210 and the unwinding device 230 is greater than 2m, the distance between them is large, which means that the composite membrane 100 in the middle position does not receive effective support during the stretching process and will sink under its own weight, resulting in large fluctuations in the composite membrane 100. In addition, when the distance between the stretching device 210 and the unwinding device 230 reaches a certain value, the first membrane layer 110 and the second membrane layer 130 are completely separated. Further increasing the distance between the stretching device 210 and the unwinding device 230 does not contribute to the separation of the composite membrane 100, but it will increase the volume and space occupied by the recycling equipment 200, which is not conducive to the miniaturization of the recycling equipment 200. When the distance d between the stretching device 210 and the unwinding device 230 is less than 1m, the distance between the stretching device 210 and the unwinding device 230 is too small, so that the composite membrane 100 is not stretched enough during the stretching process, and the first membrane layer 110 and the second membrane layer 130 are not completely separated, making it impossible to separate and recycle the first membrane layer 110 and the second membrane layer 130.

[0082] In some embodiments, the number of suction devices 250 is two, and the suction devices 250 are disposed on both sides of the first membrane layer 110 in the thickness direction. In other words, the suction devices 250 are disposed on opposite sides of the composite membrane material 100. In the embodiments of this application, the two suction devices 250 are disposed in the housing 270 and communicate with the recovery chamber 290. The two suction devices 250 are spaced apart along the direction in which the first membrane layer 110 and the second membrane layer 130 are stacked.

[0083] The recycling device 200 of this application includes two suction devices 250, and the two suction devices 250 are spaced apart along the direction in which the first membrane layer 110 and the second membrane layer 130 are stacked. When the composite membrane material 100 has two second membrane layers 130, and one second membrane layer 130 is respectively disposed on the two opposite surfaces of the first membrane layer 110, the suction devices 250 can adsorb and recycle the second membrane layers 130 disposed on the two opposite surfaces of the first membrane layer 110, which is beneficial to improving the recycling rate of the second membrane layer 130 by the recycling device 200.

[0084] Optionally, in some embodiments, the recycling device 200 further includes a housing 270, which encloses a recycling cavity 290. The suction device 250 is disposed on the housing 270 and communicates with the recycling cavity 290. The housing 270 has a first through groove 271 and a second through groove 273 on opposite sides. The stretching device 210 is rotatably disposed on the side of the housing 270 away from the first through groove 271, and the unwinding device 230 is rotatably disposed on the side of the housing 270 away from the second through groove 273. Before recycling the composite film 100, the composite film 100 is fitted onto the unwinding device 230, the stretching end 170 of the composite film 100 is pulled out, passes sequentially through the first through groove 271 and the second through groove 273, and is finally wound onto the stretching device 210. When in operation, the recycling device 200 is turned on, the stretching device 210 and the unwinding device 230 are started simultaneously, and the pulling speed of the stretching device 210 is controlled to be greater than the unwinding speed of the unwinding device 230.

[0085] In the recycling device 200 of this application embodiment, the unwinding device 230 is used to cover the unwinding end 150 of the composite film 100, and the stretching end 170 of the composite film 100 passes through the first through groove 271 and the second through groove 273 in sequence and is then wound onto the stretching device 210. When the recycling device 200 is working, the stretching device 210 and the unwinding device 230 are started simultaneously, and the pulling speed of the stretching device 210 is greater than the unwinding speed of the unwinding device 230. This causes the composite film 100 to be subjected to a tensile force along the arrangement direction of the stretching device 210 and the unwinding device 230 when it passes through the recycling chamber 290. The deformation of the first film layer 110 during the stretching process is different from that of the second film layer 130, which reduces the bonding force between the first film layer 110 and the second film layer 130 and eventually achieves separation. The second film layer 130 falls off the first film layer 110 and is recycled in the recycling chamber 290. The first film layer 110 is wound onto the stretching device 210, thereby achieving the purpose of separating and recycling the first film layer 110 and the second film layer 130.

[0086] Understandably, in some embodiments, the pulling speed of the stretching device 210 can be made greater than the unwinding speed of the unwinding device 230 by controlling the rotation speed of the stretching device 210 to be greater than the unwinding speed of the unwinding device 230; in other embodiments, the pulling speed of the stretching device 210 can be made greater than the unwinding speed of the unwinding device 230 by setting the diameter of the shaft of the stretching device 210 to be greater than the diameter of the shaft of the unwinding device 230, and synchronizing the number of rotations of the stretching device 210 and the unwinding device 230.

[0087] In some embodiments, the negative pressure β of the inhalation device 250 is in the range of 10 mbar ≤ β ≤ 260 mbar. Specifically, the negative pressure β of the inhalation device 250 can be, but is not limited to, 10 mbar, 30 mbar, 50 mbar, 70 mbar, 110 mbar, 130 mbar, 150 mbar, 180 mbar, 200 mbar, 210 mbar, 230 mbar, 245 mbar, 250 mbar, and 260 mbar.

[0088] In the embodiments of this application, when the negative pressure β of the suction device 250 meets the range of 10mbar≤β≤260mbar, the negative pressure β of the suction device 250 is within a reasonable range, so that when the second membrane layer 130 falls off from the first membrane layer 110, the suction device 250 can adsorb and recover it in time, so that the fallen second membrane layer 130 will neither fall into the recovery chamber 290 nor be wound onto the winding unit; in addition, the negative pressure β of the suction device 250 is within a reasonable range, so as not to break the composite membrane material 100. When the negative pressure β of the suction device 250 is greater than 260 mbar, the adsorption force of the suction device 250 is too large, which can easily cause the composite membrane 100 to break in the recovery chamber 290, thereby stopping the recovery process of the composite membrane 100. When the negative pressure β of the suction device 250 is less than 10 mbar, the adsorption force of the suction device 250 is too small, making it difficult to adsorb and recover the second membrane layer 130 that has fallen off the first membrane layer 110 in a timely manner, thus reducing the recovery rate of the second membrane layer 130 by the recovery device 200.

[0089] In other embodiments, the airflow γ of the suction device 250 ranges from 2000m³. 3 / h≤γ≤20000m 3 / h. Specifically, the airflow γ of the suction device 250 can be, but is not limited to, 2000m³ / h. 3 / h, 3000m 3 / h, 5000m 3 / h、7000m 3 / h、9000m 3 / h, 10000m 3 / h, 12000m 3 / h, 14000m 3 / h, 16000m 3 / h, 17000m 3 / h, 18000m 3 / h、19000m 3 / h and 20000m 3 / h etc.

[0090] In the embodiments of this application, when the air volume γ of the suction device 250 meets the range of 2000m³, 3 / h≤γ≤20000m 3 At a speed of / h, the airflow γ of the suction device 250 is within a reasonable range, ensuring that when the second membrane layer 130 detaches from the first membrane layer 110, the suction device 250 can promptly adsorb and recover it, preventing the detached second membrane layer 130 from falling into the recovery chamber 290 or being wound onto the winding unit. Furthermore, the airflow γ of the suction device 250 is within a reasonable range, preventing the composite membrane material 100 from breaking. When the airflow γ of the suction device 250 is greater than 20000 m³ / h... 3 When the airflow rate γ of the suction device 250 is too high, the composite membrane 100 may break within the recovery chamber 290, thus halting the recovery process of the composite membrane 100. When the airflow rate γ of the suction device 250 is less than 2000 m³ / h... 3 When the suction force of the suction device 250 is too small at a certain rate, it is difficult to adsorb and recover the second membrane layer 130 that has fallen off from the first membrane layer 110 in a timely manner, which reduces the recovery rate of the second membrane layer 130 by the recovery device 200.

[0091] Please see Figure 8 and Figure 9 This application also provides a recyclable membrane roll 300, which is obtained by the recycling method provided in this application. The length of the composite membrane material 100 is 'a', and the length of the recyclable membrane roll 300 is 'b', satisfying the condition: 1.6a ≤ b ≤ 2.5a. Specifically, the length b of the recyclable membrane roll 300 can be, but is not limited to, 1.6a, 1.65a, 1.68a, 1.7a, 1.75a, 1.8a, 1.82a, 1.89a, 1.95a, 2.01a, 2.13a, 2.2a, 2.25a, ​​2.36a, 2.45a, and 2.5a.

[0092] In the embodiments of this application, the recycled membrane roll 300 is made from the composite membrane material 100 by the recycling method provided in this application. During the separation process of the composite membrane material 100, the composite membrane material 100 is stretched so that the length b of the recycled membrane roll 300 satisfies the condition: 1.6a≤b≤2.5a.

[0093] In some embodiments, the recovery rate θ1 of the recycling device 200 for the second membrane layer 130 ranges from 90% to 100%. Specifically, the recovery rate θ1 of the recycling device 200 for the second membrane layer 130 can be, but is not limited to, 90%, 90.5%, 91%, 91.4%, 92%, 92.5%, 93%, 93.6%, 94%, 94.6%, 95%, 95.1%, 96%, 97%, 98%, 99%, and 100%. In the embodiments of this application, the recycling device 200 can effectively separate the first membrane layer 110 and the second membrane layer 130, and has a high recovery rate for the second membrane layer 130.

[0094] In some embodiments, the recovery rate θ2 of the recycling device 200 for the first membrane layer 110 ranges from 90% to 100%. Specifically, the recovery rate θ2 of the recycling device 200 for the first membrane layer 110 can be, but is not limited to, 90%, 90.5%, 91%, 91.4%, 92%, 92.5%, 93%, 93.6%, 94%, 94.6%, 95%, 95.1%, 96%, 97%, 98%, 99%, and 100%. In the embodiments of this application, the recycling device 200 can effectively separate the first membrane layer 110 and the second membrane layer 130, and has a high recovery rate for the first membrane layer 110.

[0095] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A method for separating composite membrane materials, characterized in that, The separation method includes: A composite membrane material is provided, the composite membrane material comprising a first membrane layer and a second membrane layer stacked thereon, wherein the elongation at break e1 of the first membrane layer is greater than the elongation at break e2 of the second membrane layer, and the composite membrane material includes an unwinding end and a stretching end spaced apart; and The stretching end is pulled and the unwinding end is unwound, wherein the pulling speed of the stretching end is greater than the unwinding speed of the unwinding end, so that the first film layer and the second film layer are separated by force; the value range of the difference δv between the pulling speed of the stretching end and the unwinding speed of the unwinding end is: 2m / min≤δv≤10m / min; the value range of the difference δe between the elongation at break e1 of the first film layer and the elongation at break e2 of the second film layer is: 35%≤δe≤155%.

2. The separation method for the composite membrane material according to claim 1, characterized in that, The range of the pulling speed v1 at the stretching end is: 5m / min≤v1≤15m / min; the range of the unwinding speed v2 at the unwinding end is: 1m / min<v2≤10m / min.

3. The separation method for the composite membrane material according to claim 1, characterized in that, The elongation at break e1 of the first film layer is in the range of 60% ≤ e1 ≤ 150%; the elongation at break e2 of the second film layer is in the range of 1% ≤ e2 ≤ 20%.

4. A method for recycling composite membrane materials, characterized in that, The recycling method includes: The method for separating the composite membrane material according to any one of claims 1 to 3; and Inhalation is performed on the side of the second membrane layer opposite to the first membrane layer to separate and recover the second membrane layer, and the first membrane layer is recovered on the side of the stretched end.

5. The method for recycling composite membrane materials according to claim 4, characterized in that, The first film layer is a polymer, and the second film layer is a metal; the adhesive force α between the first film layer and the second film layer is in the range of 1N / cm≤α≤10N / cm.

6. The method for recycling the composite membrane material according to claim 4, characterized in that, The second membrane layer consists of two layers, which are respectively disposed on two surfaces opposite to the first membrane layer. Air is drawn in from both sides of the first membrane layer to separate and recover the second membrane layer, and the first membrane layer is recovered from one side of the stretching end.

7. A recycling device, characterized in that, For recycling the composite membrane material according to any one of claims 4 to 6, the recycling equipment comprises: A stretching device is used to set the stretching end of the composite film material and to wind up the first film layer. An unwinding device, spaced apart from the stretching device, is used to receive the composite film material and to unwind the composite film material; and An air suction device is disposed on the side of the first film layer close to the second film layer in the thickness direction, and is used to adsorb and peel off the second film layer.

8. The recycling equipment according to claim 7, characterized in that, The distance d between the stretching device and the unwinding device ranges from 1m to 2m.

9. The recycling equipment according to claim 7, characterized in that, There are two air suction devices, which are located on both sides of the thickness direction of the first film layer.

10. The recycling equipment according to claim 7, characterized in that, The negative pressure β of the suction device ranges from 10 mbar to 260 mbar, and the airflow γ of the suction device ranges from 2000 m³ / h to 260 mbar. 3 / h≤γ≤20000m 3 / h.

11. A recyclable membrane roll, characterized in that: The composite membrane material is prepared by the recycling method according to any one of claims 4 to 6, wherein the length of the composite membrane material is a and the length of the recycled membrane roll is b, and the condition is satisfied: 1.6a≤b≤2.5a.

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