Antistatic protective film and preparation device and method thereof

Abstract

The application relates to the technical field of protective films, in particular to an antistatic protective film and a preparation device and method thereof. The antistatic protective film comprises a raw material mixing tank, a core layer forming mechanism, a film pressure forming mechanism and a film winding mechanism; the raw material mixing tank is a metal tank and is used for mixing an antistatic agent and a base material. The mixing liquid treatment mechanism arranged between the raw material mixing tank and the core layer forming mechanism is used for heating the raw material mixing liquid passing through the material guide pipe through a heating assembly, continuously shearing and extruding the raw material mixing liquid through a double-helix extrusion rod of an extrusion assembly, and rapidly cooling the mixed raw material through a rapid cooling assembly before processing and forming through a coating plate. In the process, the molecules are activated through heating, the agglomeration is broken through strong shearing, and the uniform state is locked through rapid cooling, so that the problem that the polar additive is agglomerated in the non-polar base and affects the quality of the antistatic film finished product is further solved.

Description

Technical Field

[0001] This invention relates to the field of protective film technology, and in particular to an antistatic protective film and its preparation apparatus and method. Background Technology

[0002] Antistatic protective film is a protective material that prevents static electricity accumulation and discharge damage by reducing surface resistance or through conductive treatment. It is widely used in the packaging of electronic products, screens, and precision components.

[0003] Antistatic protective films are protective materials that prevent the accumulation of static charge by adding specific functional materials to give the film the ability to dissipate static electricity or conduct electricity. They have strict control over surface resistivity and can safely discharge static charge in milliseconds.

[0004] Based on their antistatic mechanisms, antistatic agents can be divided into two main categories: intrinsic and additive. Intrinsic agents use conductive polymers such as polyaniline and polythiophene as the base material, which have strong antistatic capabilities but are expensive. Additive agents, on the other hand, incorporate antistatic agents such as carbon nanotubes, metal oxides, and quaternary ammonium salt surfactants into a common polymer matrix. They offer high cost-effectiveness and mature technology, and dominate the market.

[0005] Currently, in the production of additive-type antistatic protective films, antistatic agents are mixed into the polymer matrix. These antistatic agents are mostly polar molecules, while the common polymer matrix of antistatic films is generally a non-polar polymer. Since non-polar polymers (such as PE, PP, and silicone) rely primarily on weak van der Waals forces between molecules, while polar molecules (such as water, alcohols, and small-molecule polar additives) exhibit stronger dipole-dipole interactions and may even form hydrogen bonds, the system tends to reduce unfavorable contact when polar molecules are mixed into non-polar polymers. In other words, the compatibility between polar antistatic agents and non-polar polymers is poor, resulting in uneven dispersion of the antistatic agent within the matrix. This leads to inconsistent conductivity, uneven resistivity distribution, unstable test data, and even electrostatic failure in certain areas. Furthermore, poor compatibility between the antistatic agent and the polymer, and uneven distribution of the antistatic agent within the polymer, can also cause the protective film to whiten or fog, affecting optical transparency. Summary of the Invention

[0006] This invention provides an antistatic protective film and its preparation apparatus and method. During the preparation process, when polar molecules such as antistatic agents are mixed into a non-polar polymer matrix, the mixture is heated at high temperature. At high temperatures, the polymer chains become more active, which helps to surround the polar molecules and increase molecular motion, weakening the association between polar molecules. Simultaneously, during the discharge of the mixture, a twin-helix extruder is used in the discharge pipe to continuously break down the mixture through shear force. Furthermore, before the subsequent coating of the mixture to form the film, a cooling system is used for rapid cooling, freezing the dispersed structure before the polymer molecular chains and polar molecules have time to re-aggregate. This allows the antistatic agent to be uniformly mixed within the polymer matrix, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides an antistatic protective film preparation apparatus, comprising a raw material mixing tank, a core layer forming mechanism, a membrane pressing mechanism, and a film winding mechanism. The raw material mixing tank is a metal tank and is used to mix an antistatic agent and a substrate. The core layer forming mechanism is disposed on one side of the raw material mixing tank and is used to extrude the introduced mixture into a core layer film. The membrane pressing mechanism is disposed at the outlet end of the core layer forming mechanism. When the core layer forming mechanism exits the core layer film, the membrane pressing mechanism can be used to introduce the upper and lower surface layers and complete the membrane pressing between the upper and lower layers of the core layer film to form the antistatic film. The film winding mechanism is disposed at the discharge end of the membrane pressing mechanism and is used to wind up the formed antistatic film. The invention is characterized by further including a mixture treatment mechanism disposed between the raw material mixing tank and the core layer forming mechanism. The mixture processing mechanism includes a feed pipe, a heating component, an extrusion component, and a rapid cooling component. The feed inlet of the feed pipe is located below the discharge pipe of the raw material mixing tank, and the discharge outlet faces the feed end of the core layer forming mechanism. A vertically downward coating plate is provided at the discharge outlet of the feed pipe, and the bottom end of the coating plate is attached to the coating rollers of the core layer forming mechanism. The coating plate can guide the mixture to the coating rollers of the core layer forming mechanism and complete the extrusion forming. The heating component is located outside the feed pipe, and the heating end is attached to the feed pipe, and is used to heat the feed pipe and the internal mixture. The extrusion component is located between the discharge outlet of the feed pipe and the coating plate, and is used to continuously break up the mixture discharged from the discharge outlet. The broken mixture is coated onto the coating rollers of the core layer forming mechanism through the coating plate. The rapid cooling component is located on one side of the coating plate, and is used to cool the mixture passing through the coating plate, so that the mixture is cooled before entering the core layer forming mechanism.

[0008] The extrusion assembly includes an extrusion pipe, a twin-helix extrusion rod, and a drive device. The extrusion pipe is located below the discharge port of the feed pipe. The twin-helix extrusion rod is rotatably mounted inside the extrusion pipe. The drive device is located outside the extrusion pipe, and the output end of the drive device is connected to the twin-helix extrusion rod to drive the twin-helix extrusion rod to rotate and extrude and shear the mixture passing through the extrusion pipe to continuously break down the mixture. The coating plate is a hollow plate that is narrow at the top and wide at the bottom, and the top of the coating plate is connected to an extrusion pipe, which is used to coat the mixture in a flat state between the coating rollers of the core layer forming mechanism.

[0009] The rapid cooling assembly includes a cooling nozzle and a cooler body. The cooler body is a device capable of generating cold air. The cooling nozzle is located on one side of the coating plate, and the cooling end of the cooling nozzle faces the bottom of the coating plate. It is used to cool the discharged mixture and apply it between the coating rollers of the core layer forming mechanism.

[0010] The double-helix extrusion rod has a hollow structure with a first refrigerant channel inside. The coating plate has a second refrigerant channel inside. The main body of the rapid cooling component is equipped with a cold air generation module and a refrigerant liquid circulation module. The output end of the refrigerant liquid circulation module is connected to the inlet of the first refrigerant channel through a rotary joint. The outlet of the first refrigerant channel is then connected to the inlet of the second refrigerant channel. The outlet of the second refrigerant channel finally flows back to the refrigerant liquid circulation module, thus forming a series cooling circuit between the inside of the double-helix extrusion rod, the inside of the coating plate, and the main body of the cooler. This allows the refrigerant to flow through the inside of the double-helix extrusion rod and the inside of the coating plate successively, thereby continuously cooling the mixture as it passes through the extrusion pipe and the coating plate. The second refrigerant channel inside the wall of the coated plate is a meandering flow channel, thereby increasing the flow area of ​​the refrigerant.

[0011] In the above technical solution, the mixture is preheated by a heating component to reduce polymer viscosity and enhance molecular chain activity, enabling it to better surround polar antistatic agent molecules and effectively weaken the initial association between polar molecules, laying the foundation for subsequent uniform dispersion. At the same time, the mixture is subjected to strong extrusion and shearing by a double-helix extruder in the extrusion component. The mechanical shearing force continuously breaks down any agglomerates or undispersed droplets, physically destroying the agglomerated structure and ensuring that the antistatic agent enters the subsequent process in a small and uniform form. In addition, a rapid cooling component is set up before coating and molding. By rapidly cooling the mixture that has just been sheared and broken down, the molecular mobility is instantly reduced, preventing the polymer molecular chains and polar antistatic agent molecules from re-aggregating or associating. This locks the uniformly dispersed metastable structure in the matrix, greatly improving the uniformity and stability of the antistatic agent distribution in the final core film.

[0012] The present invention also provides an antistatic protective film, manufactured based on the above-mentioned antistatic protective film preparation device, comprising a substrate layer and a functional layer. The substrate layer includes an upper surface layer, a central core layer and a lower surface layer. The upper surface layer and the lower surface layer are both non-polar polymer matrices. The central core layer is disposed between the upper surface layer and the lower surface layer and is an antistatic functional core layer. The functional layer includes an adhesive layer and a waterproof layer. The adhesive layer is disposed between the upper surface layer, the central core layer and the lower surface layer, and the waterproof layer is applied to the outside of the upper surface layer. The central core layer includes a polymer substrate, an antistatic agent body, and a dispersing agent. The polymer substrate is a non-polar polymer. The antistatic agent body is mixed within the polymer substrate and is a mixed antistatic material composed of a polymeric permanent antistatic agent, an ionic liquid, and a conductive filler. The dispersing agent is mixed within the polymer substrate and is a compatibilizer used to further reduce the agglomeration of the antistatic agent particles.

[0013] The present invention also provides a production method based on the above-mentioned antistatic protective film preparation apparatus, comprising the following steps: S1. Inside the raw material mixing tank, polar molecules such as antistatic agents and non-polar polymer matrices are mixed, and the mixture is discharged from the bottom of the raw material mixing tank outlet pipe into the feed pipe. S2. At this time, the heating component heats the feed tube and the internal mixture. At high temperature, the polymer chains of the mixture are more active, which helps to surround polar molecules and increase molecular motion, weakening the association between polar molecules. The mixture passes through the feed tube and is discharged from the outlet on the other side. At this time, the mixture enters the extrusion pipe. At high temperature, the polymer chains of the mixture are more active, which helps to surround polar molecules and increase molecular motion, weakening the association between polar molecules. S3. The double helix extruder is driven by the drive device to rotate and extrude the mixture passing through the extrusion pipe. The mixture is extruded and sheared by the shearing force and continuously broken into the outlet pipe. The continuously broken mixture flows into the coating plate through the extrusion pipe. S4. At this time, the main body of the cooler is started, and cold air is sprayed out from the cooling end of the cooling nozzle. The cold air is directed at the bottom of the coating plate for cooling. The liquid passing through the bottom of the coating plate is coated on the coating roller of the forming mechanism and cooled by the cold air. The core layer forming mechanism is started to extrude the raw material into a core layer film and introduce the core layer film into the membrane pressing mechanism. In the membrane pressing mechanism, the polymer film is formed by extruding the polymer film on the upper and lower surfaces of the core layer film. Rapid cooling cools the dispersed structure, reduces the molecular movement of polymer molecular chains and polar molecules, and prevents polymer molecular chains and polar molecules from re-aggregating. This allows the antistatic agent to be uniformly mixed in the polymer matrix and the film to be formed quickly in the subsequent forming process to avoid temperature recovery. S5. Allow the antistatic film to be formed and discharged through the discharge end of the film pressing mechanism, and then rewind the formed antistatic film through the film winding mechanism.

[0014] Compared with the prior art, the present invention provides an antistatic protective film and its preparation apparatus and method, which have the following beneficial effects: This invention utilizes a mixture processing mechanism located between the raw material mixing tank and the core layer forming mechanism. The raw material mixture passing through the feed pipe is first heated by a heating component, then continuously sheared and extruded by the double-helix extrusion rod of the extrusion component. Before being processed and formed using a coating plate, the mixed raw material is rapidly cooled by a rapid cooling component. During this process, molecules are first activated by heating, then agglomerates are broken up by strong shearing, and finally a uniform state is locked in by rapid cooling. This further solves the problem of polar additives agglomerating in a non-polar matrix, thus affecting the quality of the finished antistatic film.

[0015] The twin-helix extrusion bar and extrusion pipe in the extrusion assembly are directly positioned between the feed pipe outlet and the coating plate. This allows the mixture, after being strongly sheared and broken down, to flow directly to the coating area without stagnation or secondary aggregation. Furthermore, the twin-helix extrusion bar is designed with a hollow structure and an internal first refrigerant channel, making the rotating extrusion bar itself a dynamic cooling element. The cooling function is directly embedded in the mechanical shearing components, achieving a fusion of shearing and cooling structures and functions.

[0016] Furthermore, by constructing a series cooling circuit consisting of the main body of the cooler, the first refrigerant channel inside the double-helix extrusion rod, the second refrigerant channel inside the coating plate, and the main body of the cooler, an integrated, seamless low-temperature channel is formed from extrusion shearing to coating molding. This allows the mixture to be continuously cooled throughout the entire process, including in the extrusion pipe, inside the coating plate, and at the coating outlet. The coating plate itself becomes a low-temperature distributor. When the mixture is discharged to the core layer forming mechanism, it is simultaneously subjected to dual rapid cooling by heat absorption inside the plate and external cold air blowing, further preventing the molecules from re-aggregating due to temperature rise. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic diagram showing the structural distribution of the raw material mixing tank, the core layer forming mechanism, and the mixed liquid processing mechanism in this invention; Figure 4 This is a front view showing the structural distribution of the raw material mixing tank, core layer forming mechanism, and mixed liquid processing mechanism in this invention; Figure 5 This is a structural exploded view of the raw material mixing tank, the core layer forming mechanism, and the mixed liquid processing mechanism in this invention; Figure 6 This is a schematic diagram showing the structural distribution of the extrusion assembly and coating plate in this invention; Figure 7 This is a structural diagram of the antistatic film in this invention; Figure 8 This is a schematic diagram of the internal structure distribution of the antistatic film in this invention.

[0018] In the diagram: 1. Raw material mixing tank; 2. Core layer forming mechanism; 3. Membrane pressing mechanism; 4. Membrane winding mechanism; 5. Feed guide pipe; 51. Coating plate; 6. Heating assembly; 7. Extrusion assembly; 71. Extrusion pipe; 72. Twin-helix extrusion bar; 722. Rotary joint; 73. Drive device; 8. Rapid cooling assembly; 81. Cooling nozzle; 82. Refrigerator body; 9. Substrate layer; 91. Upper surface layer; 92. Central core layer; 921. Polymer substrate; 922. Antistatic agent body; 923. Dispersing agent; 93. Lower surface layer; 10. Functional layer; 101. Adhesive layer; 102. Waterproof layer. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides an antistatic protective film preparation device that allows polar molecules such as antistatic agents to be completely mixed in the substrate, and further prevents the antistatic agents from agglomerating during processing and affecting the quality of the antistatic film after molding. Example

[0021] refer to Figures 1 to 2As shown, this invention provides an antistatic protective film preparation apparatus, including a raw material mixing tank 1, a core layer forming mechanism 2, a membrane pressing mechanism 3, and a film winding mechanism 4. The raw material mixing tank 1 is a metal tank used to mix an antistatic agent and a substrate. The core layer forming mechanism 2 is located on one side of the raw material mixing tank 1 and is used to extrude the introduced mixture into a core layer film. The membrane pressing mechanism 3 is located at the outlet end of the core layer forming mechanism 2. When the core layer forming mechanism 2 exits the core layer film, the membrane pressing mechanism 3 can be used to introduce the upper and lower surface layers and complete the membrane pressing between the upper and lower layers of the core layer film to form the antistatic film. The membrane pressing mechanism 3 is a mechanism capable of completing the entire antistatic film forming process, including the pressing process of applying adhesive and other functional film layers, which will not be described in detail here. The film winding mechanism 4 is located at the discharge end of the membrane pressing mechanism 3 and is used to wind up the formed antistatic film. The invention is characterized by further including a mixture treatment mechanism located between the raw material mixing tank 1 and the core layer forming mechanism 2. like Figure 1 , Figure 2 and Figure 3 As shown, the mixture processing mechanism includes a feed pipe 5, a heating component 6, an extrusion component 7, and a rapid cooling component 8. The feed inlet of the feed pipe 5 is located below the discharge pipe of the raw material mixing tank 1, and the discharge outlet is directly opposite the feed end of the core layer forming mechanism 2. A vertically downward coating plate 51 is provided at the discharge outlet of the feed pipe 5, and the bottom end of the coating plate 51 is attached to the coating rollers of the core layer forming mechanism 2. The coating plate 51 can guide the mixture to the coating rollers of the core layer forming mechanism 2 and complete the extrusion molding. The heating component 6 is located outside the feed pipe 5, and the heating end is attached to the core layer forming mechanism 2. The feed tube 5 is used to heat the feed tube 5 and the internal mixture. The extrusion assembly 7 is set between the discharge port of the feed tube 5 and the coating plate 51 to continuously break up the mixture discharged from the discharge port. The broken mixture is coated onto the coating roller of the core layer forming mechanism 2 through the coating plate 51. The rapid cooling assembly 8 is set on one side of the coating plate 51 to cool the mixture passing through the coating plate 51, so that the mixture is cooled before entering the core layer forming mechanism 2, so that the polymer molecular chains and polar molecules do not have time to re-aggregate, thereby allowing the antistatic agent to be uniformly mixed in the polymer matrix.

[0022] By mixing polar molecules such as antistatic agents into the non-polar polymer matrix inside the raw material mixing tank 1, the mixture is then discharged from the bottom of the discharge pipe of the raw material mixing tank 1 into the feed pipe 5. At this time, the feed pipe 5 and the internal mixture are heated by the heating component 6. The mixture is preheated by the heating component 6. At high temperature, the polymer chains of the mixture are more active, which helps to surround the polar molecules and increase molecular motion, weaken the association between polar molecules. At the same time, it reduces the polymer viscosity and enhances the activity of molecular chains, so that it can better surround the polar antistatic agent molecules, effectively weaken the initial association between polar molecules, and lay the foundation for subsequent uniform dispersion.

[0023] like Figure 6 As shown, the extrusion assembly 7 includes an extrusion pipe 71, a twin-helix extrusion rod 72, and a drive device 73. The extrusion pipe 71 is located below the discharge port of the feed pipe 5. The twin-helix extrusion rod 72 is rotatably mounted inside the extrusion pipe 71. The drive device 73 is located outside the extrusion pipe 71, and the output end of the drive device 73 is connected to the twin-helix extrusion rod 72. The drive device 73 is used to drive the twin-helix extrusion rod 72 to rotate and to extrude and shear the mixture passing through the extrusion pipe 71, so that the mixture is continuously broken down.

[0024] When the heated mixture is discharged from the outlet on the other side of the feed pipe 5 into the extrusion pipe 71, the double helix extrusion rod 72 is driven to rotate by the drive device 73. The double helix extrusion rod 72 performs strong extrusion and shearing on the mixture, and uses mechanical shearing force to continuously break up any agglomerates or undispersed droplets that may exist, physically destroying the agglomeration structure and ensuring that the antistatic agent enters the subsequent process in a small and uniform form.

[0025] Such as 5 and Figure 6 As shown, the coating plate 51 is a hollow plate that is narrow at the top and wide at the bottom, and the top of the coating plate 51 is connected to the extrusion pipe 71, which is used to coat the mixture in a flat state between the coating rollers of the core layer forming mechanism 2.

[0026] The rapid cooling assembly 8 includes a cooling nozzle 81 and a cooler body 82. The cooler body 82 is a device capable of generating cold air. The cooling nozzle 81 is disposed on one side of the coating plate 51, and the cooling end of the cooling nozzle 81 is directly facing the bottom end of the coating plate 51. It is used to cool the discharged mixture and apply it between the coating rollers of the core layer forming mechanism 2.

[0027] When the mixture flows into the coating plate 51 through the extrusion pipe 71, cold air is sprayed out from the cooling end of the cooling nozzle 81. The cold air is directed at the bottom of the coating plate 51 and the coating roller of the core layer forming mechanism 2 to cool it. The discharged mixture is cooled and coated between the coating rollers of the core layer forming mechanism 2. The core layer forming mechanism 2 is started to extrude the raw material into a core layer film and introduce the core layer film into the membrane pressing mechanism 3. In the membrane pressing mechanism 3, the polymer film is formed by extruding the upper and lower surfaces of the core layer film.

[0028] Before the mixture is applied under the coating plate 51 to form the film, the cooling system is used to quickly cool the dispersed structure and reduce the molecular movement of polymer chains and polar molecules. This prevents the polymer chains and polar molecules from re-aggregating, thus allowing the antistatic agent to be uniformly mixed in the polymer matrix, which greatly improves the uniformity and stability of the antistatic agent distribution in the final core film.

[0029] It is important to clarify that the cooling process is performed immediately before the coating roller, allowing the mixture to be extruded and formed into a core film as soon as it cools. This rapid cooling and forming method avoids the raw materials from recovering their temperature after cooling, thus preventing the problem of re-agglomeration caused by the temperature recovery after cooling. Example

[0030] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on the above embodiment 1, the double helix extrusion rod 72 has a hollow structure and is provided with a first refrigerant channel inside. The coating plate 51 is provided with a second refrigerant channel inside. The cooler body 82 of the rapid cooling component 8 is equipped with a cold air generation module and a refrigerant liquid circulation module. The output end of the refrigerant liquid circulation module is connected to the inlet of the first refrigerant channel through a rotary joint 722. The outlet of the first refrigerant channel is then connected to the inlet of the second refrigerant channel. The outlet of the second refrigerant channel finally flows back to the refrigerant liquid circulation module, so that a series cooling circuit is formed between the inside of the double helix extrusion rod 72, the inside of the coating plate 51, and the cooler body 82, so that the refrigerant flows through the inside of the double helix extrusion rod 72 and the inside of the coating plate 51 successively, thereby continuously cooling the mixture during the process of the mixture passing through the extrusion pipe 71 and the coating plate 51. The second refrigerant channel inside the wall of the coated plate 51 is a meandering flow channel, thereby increasing the flow area of ​​the refrigerant.

[0031] The low-temperature refrigerant generated by the main body of the refrigerator 82 first flows through the interior of the rotating double helical extrusion rod 72, which forces it to be cooled, making the extrusion rod itself a dynamic cooling element. At this time, when the mixture is strongly sheared and the agglomerates are broken up by the helical rod in the extrusion pipe 71, it is directly heated by the low-temperature helical rod surface, realizing the simultaneous shearing dispersion and pre-cooling, and improving the effect of locking the polar molecules immediately after uniform dispersion. Furthermore, as the mixture flows through the second refrigerant channel within the coating plate 51, the coating plate 51 remains cooled throughout the process, making the coating plate 51 itself a low-temperature distributor. When the mixture is discharged from the coating plate 51 to the core layer forming mechanism 2, it will be subjected to dual rapid cooling by heat absorption inside the plate and external cold air blowing, forming a seamless low-temperature discharge from the inside of the extruder to the forming roller. This cooling action is carried out throughout the entire shearing, conveying, and coating process, further stabilizing the uniform dispersion of non-polar molecules in the non-polar matrix.

[0032] It needs to be clarified that the mixture is first heated and then cooled in the feed tube 5. The first heating process is to make the polymer chains of the mixture more active at high temperature, surround the polar molecules and increase molecular motion, thereby reducing the association and aggregation between polar molecules. Then, during the rotation, shearing and extrusion process of the twin-helix extruder 72, due to the shearing and extrusion actions, there is no need to reduce the aggregation of polar molecules through temperature. At this time, it is more necessary to lock the position of polar molecules at low temperature, so continuous cooling is required in the subsequent shearing and coating process.

[0033] Reference Figure 7 and Figure 8 As shown, the present invention also provides an antistatic protective film, which is prepared based on the above-mentioned antistatic protective film preparation device, including a substrate layer 9 and a functional layer 10. The substrate layer 9 includes an upper surface layer 91, a central core layer 92 and a lower surface layer 93. The upper surface layer 91 and the lower surface layer 93 are both non-polar polymer matrices. The central core layer 92 is disposed between the upper surface layer 91 and the lower surface layer 93, and the central core layer 92 is the antistatic functional core layer.

[0034] The central core layer 92 includes a polymer substrate 921, an antistatic agent body 922, and a dispersant 923. The polymer substrate 921 is a non-polar polymer matrix. The antistatic agent body 922 is mixed within the polymer substrate 921. The antistatic agent body 922 is a mixed antistatic material composed of a polymeric permanent antistatic agent, an ionic liquid, and a conductive filler. The dispersant 923 is mixed within the polymer substrate 921. The dispersant 923 is a compatibilizer used to further reduce the agglomeration of antistatic agent particles. The central core layer 92 uses a conventional compatibilizer as the dispersant 923, which works synergistically with the heating, shearing, and cooling processes provided by the device to ensure the physical uniformity of the mixture during processing.

[0035] The functional layer 10 includes an adhesive layer 101 and a waterproof layer 102. The adhesive layer 101 is disposed between the upper surface layer 91, the central core layer 92 and the lower surface layer 93, and the waterproof layer 102 is applied to the outside of the upper surface layer 91.

[0036] It should be clarified that the dispersant 923 can help the antistatic agent 922 mix in the polymer matrix 921. At the same time, during the processing, through the processes of heating, shearing extrusion and cooling, it can help control the degree of mixing of the antistatic agent 922 in the polymer matrix 921 when the mixture is discharged. Compared with the addition of dispersant 923 alone, the two mixing aids work together to allow the polar molecules of the antistatic agent 922 to mix more fully in the polymer matrix 921.

[0037] A method for preparing an antistatic protective film based on the above-mentioned antistatic protective film preparation apparatus includes the following steps: S1. Inside the raw material mixing tank 1, polar molecules such as antistatic agents and non-polar polymer matrix are mixed, and the mixture is discharged from the bottom of the discharge pipe of the raw material mixing tank 1 into the feed pipe 5. S2. At this time, the heating component 6 heats the feed tube 5 and the internal mixture. At high temperature, the polymer chains of the mixture are more active, which helps to surround polar molecules and increase molecular motion, weakening the association between polar molecules. The mixture passes through the feed tube 5 and is discharged from the outlet on the other side. At this time, the mixture enters the extrusion pipe 71. S3. Drive the double helix extrusion rod 72 to rotate and extrude the mixture passing through the extrusion pipe 71 by the drive device 73. The mixture is continuously broken into the outlet pipe by the shearing force and flows into the coating plate 51 through the extrusion pipe 71. S4. At this time, the main body of the cooler 82 is started, and cold air is sprayed out from the cooling end of the cooling nozzle 81. The cold air is directed at the bottom end of the coating plate 51 for cooling. The liquid passing through the bottom end of the coating plate 51 is coated on the coating roller of the forming mechanism 2 and cooled by the cold air. The core layer forming mechanism 2 is started to extrude the raw material into a core layer film and introduce the core layer film into the membrane pressing mechanism 3. In the membrane pressing mechanism 3, the polymer film is extruded and formed by pressing the upper and lower surfaces of the core layer film. S5. The antistatic film is formed and discharged through the discharge end of the film pressing mechanism 3, and then the formed antistatic film is wound up by the film winding mechanism 4.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing an antistatic protective film, comprising a raw material mixing tank (1), a core layer forming mechanism (2), a film pressing forming mechanism (3), and a film winding mechanism (4), characterized in that, It also includes a mixture processing mechanism disposed between the raw material mixing tank (1) and the core layer forming mechanism (2); The mixture processing mechanism includes: a feed pipe (5), a heating component (6), an extrusion component (7), and a rapid cooling component (8). The feed inlet of the feed pipe (5) is located below the discharge outlet of the raw material mixing tank (1), and a coating plate (51) is provided at the discharge outlet. The discharge end of the coating plate (51) corresponds to the feed end of the core layer forming mechanism (2). The heating component (6) is located outside the feed tube (5) and is used to heat the feed tube (5) and the mixture inside it. The extrusion assembly (7) is located between the outlet of the feed tube (5) and the coating plate (51) to break up the mixture; The rapid cooling component (8) is disposed on one side of the coating plate (51) and is used to cool the mixture passing through the coating plate (51).

2. The apparatus for preparing an antistatic protective film according to claim 1, characterized in that, The extrusion assembly (7) includes an extrusion pipe (71), a double helix extrusion rod (72), and a drive device (73). The extrusion pipe (71) is located below the discharge port of the feed pipe (5). The double helix extrusion rod (72) is rotatably mounted inside the extrusion pipe (71). The drive device (73) is located outside the extrusion pipe (71), and the output end of the drive device (73) is connected to the double helix extrusion rod (72) for driving the double helix extrusion rod (72) to rotate and extrude and shear the mixture passing through the extrusion pipe (71) to continuously break down the mixture.

3. The apparatus for preparing an antistatic protective film according to claim 1, characterized in that, The coating plate (51) is a hollow plate that is narrow at the top and wide at the bottom, and the top of the coating plate (51) is connected to the extrusion pipe (71), which is equivalent to coating the mixture in a flat state between the coating rollers of the core layer forming mechanism (2).

4. The apparatus for preparing an antistatic protective film according to claim 3, characterized in that, The rapid cooling assembly (8) includes a cooling nozzle (81) and a cooler body (82). The cooler body (82) is a device capable of generating cold air. The cooling nozzle (81) is located on one side of the coating plate (51), and the cooling end of the cooling nozzle (81) faces the bottom end of the coating plate (51). It is used to cool the discharged mixture and apply it between the coating rollers of the core layer forming mechanism (2).

5. The apparatus for preparing an antistatic protective film according to claim 4, characterized in that, The double helix extrusion rod (72) has a hollow structure and a first refrigerant channel is provided inside. The coating plate (51) has a second refrigerant channel inside. The refrigerator body (82) is equipped with a refrigerant liquid circulation module. The output end of the refrigerant liquid circulation module is connected to the inlet of the first refrigerant channel through a rotary joint (722). The outlet of the first refrigerant channel is connected to the inlet of the second refrigerant channel. The outlet of the second refrigerant channel flows back to the refrigerant liquid circulation module, thereby forming a series cooling circuit between the double helix extrusion rod (72), the coating plate (51), and the refrigerator body (82). The second refrigerant channel inside the wall of the coated plate (51) is a meandering flow channel.

6. An antistatic protective film, characterized in that, The antistatic protective film is prepared using an apparatus according to any one of claims 1-5, comprising a substrate layer (9) and a functional layer (10). The substrate layer (9) comprises an upper surface layer (91), a central core layer (92), and a lower surface layer (93). The upper surface layer (91) and the lower surface layer (93) are both non-polar polymer matrices. The central core layer (92) is disposed between the upper surface layer (91) and the lower surface layer (93), and the central core layer (92) is an antistatic functional core layer.

7. The antistatic protective film according to claim 6, characterized in that, The functional layer (10) includes an adhesive layer (101) and a waterproof layer (102). The adhesive layer (101) is disposed between the upper surface layer (91), the central core layer (92) and the lower surface layer (93). The waterproof layer (102) is applied to the outside of the upper surface layer (91).

8. The antistatic protective film according to claim 6, characterized in that, The central core layer (92) includes a polymer substrate (921), an antistatic agent body (922), and a dispersant (923). The polymer substrate (921) is a non-polar polymer. The antistatic agent body (922) is mixed in the polymer substrate (921). The antistatic agent body (922) is a mixed antistatic material composed of a polymeric permanent antistatic agent, an ionic liquid, and a conductive filler. The dispersant (923) is mixed in the polymer substrate (921). The dispersant (923) is a compatibilizer used to further reduce the agglomeration of antistatic agent particles. The antistatic agent (922) and the dispersant (923) are uniformly distributed in the polymer substrate (921).

9. A method for preparing an antistatic protective film, characterized in that, The preparation of an antistatic protective film using the apparatus described in any one of claims 1 to 5 includes the following steps: S1. Inside the raw material mixing tank (1), polar molecules such as antistatic agents and non-polar polymer matrix are mixed, and the mixture is discharged from the bottom of the discharge pipe of the raw material mixing tank (1) into the feed pipe (5). S2. At this time, the heating component (6) heats the feed pipe (5) and the internal mixture. At high temperature, the polymer chain of the mixture is more active, which helps to surround the polar molecules and increase molecular motion, weakening the association between polar molecules. The mixture passes through the feed pipe (5) and is discharged from the outlet on the other side. At this time, the mixture enters the extrusion pipe (71). S3. Drive the double helix extrusion rod (72) to rotate and extrude by the drive device (73), and extrude the mixture passing through the extrusion pipe (71). The mixture is continuously broken into the outlet pipe by the shearing force, and the continuously broken mixture flows into the coating plate (51) through the extrusion pipe (71). S4. At this time, the main body of the cooler (82) is started, and cold air is sprayed out from the cooling end of the cooling nozzle (81). The cold air is directed at the bottom of the coating plate (51) for cooling. The liquid passing through the bottom of the coating plate (51) is coated on the coating roller of the forming mechanism (2) and cooled by the action of the cold air. The core layer forming mechanism (2) is started to extrude the raw material into a core layer film and introduce the core layer film into the membrane pressing mechanism (3). In the membrane pressing mechanism (3), the polymer film is extruded and formed by pressing the upper and lower surfaces of the core layer film. S5. The antistatic film is formed and discharged through the discharge end of the film pressing mechanism (3), and then the formed antistatic film is wound up by the film winding mechanism (4). In step S2, the polymer chains in the mixture are more active at high temperatures, which helps to surround polar molecules and increase molecular motion, thereby weakening the association between polar molecules. In step S4, rapid cooling cools the dispersed structure, reducing the molecular motion of polymer chains and polar molecules. This prevents the polymer chains and polar molecules from re-aggregating, allowing the antistatic agent to mix uniformly within the polymer matrix. In the subsequent molding process, this allows the film to form quickly, avoiding the need for temperature recovery.

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