Preparation method of anti-sticking and anti-static isolating membrane

Abstract

The invention relates to the technical field of isolating membranes, in particular to a preparation method of an anti-sticking and anti-static isolating membrane. The problem that an existing isolating membrane is poor in anti-sticking performance and anti-static performance is solved. The preparation method comprises the following steps: performing plasma treatment on a PET film through mixed gas of argon and oxygen to obtain a pretreated base material; mixing modified polyurethane, carbon nanotubes, a silane coupling agent KH-570 and deionized water to prepare an antistatic layer coating, and coating and drying to form an antistatic layer; mixing organic silicon resin, modified silicon dioxide, a cross-linking agent and a Karst catalyst to prepare an anti-sticking layer coating, and coating the anti-sticking layer coating on the surface of the antistatic layer to obtain an anti-sticking layer; and compounding and curing to obtain the anti-sticking and anti-static isolating membrane. The modified polyurethane is synthesized from materials such as isophorone diisocyanate and polytetrahydrofuran ether glycol, and the modified silicon dioxide is prepared from silane coupling agent modified nano silicon dioxide. The isolating membrane has excellent anti-sticking and anti-static properties.

Description

Technical Field

[0001] This invention relates to the field of isolation membrane technology, specifically to a method for preparing an anti-sticking and antistatic isolation membrane. Background Technology

[0002] PET release film is a functional film made by coating a layer of release agent onto the surface of a polyethylene terephthalate (PET) film substrate. PET substrate is widely used due to its excellent overall performance, with key characteristics including high mechanical strength, excellent heat resistance, and chemical stability. In industrial production, PET release film primarily plays the role of carrier and protector, temporarily bonding with adhesive products, electronic materials, die-cut products, and composite materials, and then peeling them off before final use. Its applications are extremely broad, covering numerous industries from consumer electronics and healthcare to new energy and building materials, making it an indispensable key auxiliary material in modern industrial production.

[0003] Despite the widespread application of PET release films, as industries increasingly demand higher precision, cleanliness, and reliability in their products, traditional release films have gradually revealed significant shortcomings in two core performance aspects, becoming a technological bottleneck restricting the development of high-end applications. The first problem is the poor stability of anti-stick properties. Traditional anti-stick performance mainly relies on adjusting the crosslinking density of the silicone coating, but this often leads to performance contradictions: reducing the crosslinking degree to achieve light peel force easily causes silicone oil transfer, contaminating the product surface; increasing the crosslinking degree to prevent silicone oil transfer leads to excessively heavy or unstable peel force, especially after exposure to high temperatures or long-term storage, where the peel force changes significantly. The second problem is weak antistatic properties. Traditional PET release films often employ antistatic treatment by adding small-molecule antistatic agents to the coating or coating the film surface with surfactants. These methods have significant drawbacks: small-molecule additives easily migrate to the film surface, not only contaminating precision products in contact with them but also failing in low-humidity environments; while the surface-coated antistatic layer is very easy to detach due to friction, resulting in a short-lived and unreliable antistatic effect. These two problems have become pain points that the industry urgently needs to address.

[0004] Therefore, a method for preparing an anti-sticking and antistatic separator is proposed. Summary of the Invention

[0005] The purpose of this invention is to design a method for preparing an anti-stick and antistatic separator.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a method for preparing an anti-sticking and antistatic insulating film, the method comprising the following steps:

[0008] Pretreated substrate is obtained by plasma treatment of PET film;

[0009] Modified polyurethane, carbon nanotubes, silane coupling agent and deionized water are mixed to obtain an antistatic coating layer; the antistatic coating is applied to the surface of a pretreated substrate to obtain an antistatic layer.

[0010] The silicone resin, modified silica, crosslinking agent and platinum catalyst are stirred and melted to obtain an anti-stick coating; the anti-stick coating is applied to the surface of the antistatic layer to obtain an anti-stick layer;

[0011] A film coated with an anti-stick layer is subjected to a composite curing process to obtain an anti-stick and anti-static isolation film.

[0012] The modified polyurethane is synthesized from isophorone diisocyanate, polytetrahydrofuran ether diol, dimethylolpropionic acid and hydroxyethyl methacrylate; the modified silica is obtained by modifying nano silica with a silane coupling agent.

[0013] Preferably, PET film (average thickness 25-50μm) is selected as the substrate; the specific process of plasma treatment is as follows: under the conditions of vacuum degree 0.2Pa and power 200W, a mixed gas with a volume ratio of argon to oxygen of 3:1 is introduced to treat the PET film for 30-60s to obtain the pretreated substrate.

[0014] Preferably, the specific preparation method of the antistatic layer by weight is as follows: 20-30 parts of modified polyurethane are placed in 60 parts of deionized water and stirred for 2 hours to obtain a polyurethane emulsion; 1-5 parts of carbon nanotubes are placed in 10 parts of deionized water and stirred for 30 minutes to obtain a dispersion; under stirring conditions, the dispersion is slowly added to the polyurethane emulsion, and then 1-5 parts of silane coupling agent KH-570 and 15 parts of deionized water are added sequentially, and stirring is continued for 50-70 minutes to obtain an antistatic coating layer; the antistatic coating layer is uniformly coated on the surface of the pretreated substrate using microgravure coating, and the dry film thickness is controlled at 0.5 μm; then it is placed in an infrared oven and dried at 80°C for 2 minutes to obtain an antistatic layer; the carbon nanotubes are multi-walled carbon nanotubes with an average diameter of 5-20 nm.

[0015] Preferably, the modified polyurethane is prepared by the following method by weight: 50-60 parts of polytetrahydrofuran ether diol and 5.5 parts of dimethylolpropionic acid are added to a four-necked flask, the temperature is raised to 110°C, and the mixture is stirred and dehydrated under vacuum for 1.5 hours. Heating is then stopped, and the system is allowed to cool to approximately 70°C. 40 parts of acetone are added, and the mixture is stirred until completely dissolved to obtain mixed solution A. Mixed solution A is cooled to 60°C, and 0.05 parts of dibutyltin dilaurate are added. Then, 30-50 parts of isophorone diisocyanate are slowly added dropwise. After completion, the reaction was maintained at 80℃ for 2-4 hours to obtain a prepolymer solution. The prepolymer solution was then cooled to 60℃, and 3-4 parts of hydroxyethyl methacrylate were slowly added dropwise. After the addition was complete, the reaction was allowed to proceed for 2 hours. The system temperature was then further reduced to 45℃, and 4 parts of triethylamine were added to obtain mixed solution B. In another container, 250 parts of deionized water were added, and mixed solution B was slowly added under vigorous stirring to obtain a homogeneous emulsion. The homogeneous emulsion was transferred to a rotary evaporator and distilled under reduced pressure at 45℃ to obtain modified polyurethane.

[0016] Preferably, the specific preparation method of the anti-sticking layer, by weight, is as follows: 6-10 parts of modified silica are melt-dispersed in 50 parts of organosilicon resin to obtain a pre-dispersion; then, the pre-dispersion, 40-60 parts of organosilicon resin, 2 parts of polymethylhydrosiloxane, and 0.5 parts of caster catalyst are mixed for 1 hour to obtain the anti-sticking coating; using a precision coating roller with micro-nano structure, the anti-sticking coating is precisely coated onto the antistatic layer, with the coating amount controlled at 1.0-1.5 g / m². 2 An anti-stick layer is obtained; the silicone resin is vinyl-terminated polydimethylsiloxane, CAS number: 68083-19-2.

[0017] Preferably, the specific preparation method of modified silica by weight is as follows: the average particle size of nano-silica is 20-50 nm; 5-10 parts of silane coupling agent KH-560 are added to 80 parts of anhydrous ethanol and stirred for 10 min to obtain a premix; 15 parts of deionized water are slowly added to the premix, and glacial acetic acid is added dropwise to adjust the pH of the system to acidic, and the temperature is raised to 45℃ and stirred for 30-60 min to obtain a hydrolysis solution; 95-105 parts of nano-silica are added to 350 parts of anhydrous ethanol and sonicated for 45 min to form a suspension; the suspension is transferred to a three-necked flask, heated to 65℃, and the hydrolysis solution is slowly added dropwise under stirring, with the addition time controlled at 45 min; after the addition is completed, the reaction is continued at 65℃ for 2-4 h; after the reaction is completed, the mixture is cooled to room temperature, the solid product is separated by centrifugation, washed 5 times with anhydrous ethanol, and dried in a vacuum drying oven at 90℃ for 12 h to obtain modified silica.

[0018] Preferably, the specific process of the composite curing treatment is as follows: the film after the anti-stick layer is coated is first passed through a 395nm UV-LED irradiation zone (energy 800mJ / cm). 2 The surface is light-anchored and then placed in a 100°C hot drying oven for 20-30 seconds to finally obtain an anti-stick and anti-static isolation film.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention utilizes an argon-oxygen composite gas plasma treatment process to construct a high-density array of active chemical functional groups on the surface of a PET substrate. These active sites can chemically bond with the coupling agent KH-570 in the subsequent antistatic undercoating, forming a strong interfacial bond. This robust anchoring effect ensures that the functional coating remains tightly bonded to the PET substrate even under mechanical stresses such as high-speed peeling or complex die-cutting, providing a fundamental guarantee for the overall structural stability and reliability of the release liner.

[0021] 2. In this coating, the vinyl-containing ion-conducting polyurethane emulsion constructs a stable ion-conducting pathway, while the uniformly dispersed carbon nanotubes form a highly efficient electronic conductive network. The synergistic effect of these two pathways enables the insulating membrane to possess electrostatic dissipation capabilities unaffected by environmental humidity, ensuring a persistently stable surface resistivity and effectively preventing the risks of electrostatic dust adsorption and electrostatic discharge.

[0022] 3. The silicone resin imparts low surface energy to the coating at the molecular level; the KH-560 modified nano-silica particles form a reinforcing skeleton and nanoscale rough structure in the coating; and the coating roller with micro-nano structures constructs a micron-level physical morphology on the coating surface. These three elements work synergistically to significantly reduce the effective contact area and adhesion of the release liner, achieving stable and controllable peel performance.

[0023] 4. The dual curing process employed firstly involves low-temperature UV-LED curing, which instantly sets the fine micro-nano structure and functional particle distribution on the coating surface, preventing material flow and shrinkage during the curing process. The subsequent low-temperature hot drying tunnel ensures the complete and uniform cross-linking reaction of the entire coating system. This process guarantees both the dimensional stability of the PET substrate and the creation of a dense cross-linked network in the coating, thus endowing the product with high purity and long-term stable performance.

[0024] 5. This solution utilizes precise interfacial chemical design to tightly integrate each functional layer into an organic whole, thereby synergistically enhancing the overall performance of the separator. The vinyl functional groups in the antistatic underlayer can participate in the curing reaction of the upper silicone layer, forming chemical bonds between the two layers. This integrated structure from the substrate to the top layer eliminates the risk of interlayer separation, ensuring that the antistatic and anti-stick functions coexist efficiently and stably in the same product, ultimately resulting in a separator with excellent anti-stick, antistatic properties, and high reliability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the anti-stick and antistatic isolation film of the present invention.

[0026] In the diagram: 1. Pre-treated substrate; 2. Antistatic layer; 3. Anti-stick layer. Detailed Implementation

[0027] 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.

[0028] For details, please refer to [link / reference]. Figure 1 This invention provides a method for preparing an anti-stick and antistatic separator film. The anti-stick and antistatic separator film consists of a pretreated substrate 1, an antistatic layer 2, and an anti-stick layer 3. The technical solution is as follows:

[0029] Example 1

[0030] Add 55 parts of polytetrahydrofuran ether diol and 5.5 parts of dimethylolpropionic acid to a four-necked flask, heat to 110°C, and stir under vacuum for 1.5 hours to dehydrate. Then stop heating and wait for the system to cool to about 70°C. Add 40 parts of acetone and stir until completely dissolved to obtain mixed solution A. Cool mixed solution A to 60°C, add 0.05 parts of dibutyltin dilaurate, and then slowly add 40 parts of isophorone diisocyanate. After the addition is complete, maintain the reaction temperature at 80°C for 3 hours. h, to obtain a prepolymer solution; cool the prepolymer solution to 60℃, slowly add 3.5 parts of hydroxyethyl methacrylate dropwise, after the addition is complete, react for 2h, further reduce the system temperature to 45℃, add 4 parts of triethylamine, to obtain mixed solution B; add 250 parts of deionized water to another container, and slowly add mixed solution B under vigorous stirring to obtain a homogeneous emulsion; transfer the homogeneous emulsion to a rotary evaporator, and distill under reduced pressure at 45℃ to obtain modified polyurethane.

[0031] Eight parts of silane coupling agent KH-560 were added to 80 parts of anhydrous ethanol and stirred for 10 min to obtain a premix. 15 parts of deionized water were slowly added to the premix, and glacial acetic acid was added dropwise to adjust the pH of the system to acidic. The mixture was heated to 45°C and stirred for 45 min to obtain a hydrolysate. 100 parts of nano-silica were added to 350 parts of anhydrous ethanol and sonicated for 45 min to form a suspension. The suspension was transferred to a three-necked flask, heated to 65°C, and the hydrolysate was slowly added dropwise under stirring for 45 min. After the addition was complete, the reaction was continued at 65°C for 3 h. After the reaction was completed, the mixture was cooled to room temperature, the solid product was separated by centrifugation, washed five times with anhydrous ethanol, and dried in a vacuum drying oven at 90°C for 12 h to obtain modified silica.

[0032] Under vacuum conditions of 0.2 Pa and power of 200 W, a mixed gas of argon and oxygen in a volume ratio of 3:1 was introduced to treat the PET film for 45 s to obtain a pretreated substrate.

[0033] 25 parts of modified polyurethane were placed in 60 parts of deionized water and stirred for 2 hours to obtain a polyurethane emulsion. 3 parts of carbon nanotubes were placed in 10 parts of deionized water and stirred for 30 minutes to obtain a dispersion. Under stirring conditions, the dispersion was slowly added to the polyurethane emulsion, followed by the sequential addition of 3 parts of silane coupling agent KH-570 and 15 parts of deionized water. Stirring was continued for 60 minutes to obtain an antistatic coating layer. The antistatic coating layer was uniformly coated onto the surface of the pretreated substrate using a microgravure coating process, with the dry film thickness controlled at 0.5 μm. Subsequently, the substrate was placed in an infrared oven and dried at 80°C for 2 minutes to obtain the antistatic layer.

[0034] Eight parts of modified silica were melt-dispersed in 50 parts of silicone resin to obtain a pre-dispersion. The pre-dispersion, 50 parts of silicone resin, and 0.5 parts of caster catalyst were then mixed for 1 hour to obtain an anti-stick coating. Using a precision coating roller with micro / nano structures, the anti-stick coating was precisely coated onto the antistatic layer, with the coating amount controlled at 1.2 g / m². 2 This yields an anti-sticking layer;

[0035] The film coated with the anti-stick layer is first passed through a 395nm UV-LED irradiation zone (energy 800mJ / cm). 2 The surface is light-anchored and then placed in a 100°C hot drying tunnel for 25 seconds to finally obtain an anti-stick and anti-static isolation film.

[0036] Examples 2-5 refer to the parameter conditions in Example 1, with specific differences shown in Table 1.

[0037] Table 1 Parameters and Conditions for Examples 1-5

[0038]

[0039] Comparative Example 1 follows the same parameters and conditions as in Example 1, except that vinyl (hydroxyethyl methacrylate) is not introduced into the polyurethane.

[0040] Comparative Example 2 follows the same parameters and conditions as in Example 1, except that hydrophilic groups (dimethylolpropionic acid) are not introduced onto the polyurethane.

[0041] Comparative Example 3 follows the same parameters and conditions as in Example 1, except that polyurethane is used instead of modified polyurethane.

[0042] Comparative Example 4 follows the same parameters and conditions as in Example 1, except that carbon nanotubes are not added.

[0043] Experiment Example 1: Antistatic Performance Test

[0044] The surface resistivity of Examples 1-5 and Comparative Examples 1-4 was tested according to the SO287-2017 standard, and the results are shown in Table 2.

[0045] Table 2 Antistatic properties of Examples 1-5 and Comparative Examples 1-4

[0046]

[0047]

[0048] Table 2 shows that in Comparative Example 1, because no vinyl groups were introduced onto the polyurethane, it could not form a chemical bond with the upper silicone anti-stick layer. The two coatings were only bonded by weak physical forces, resulting in poor interfacial adhesion. Although the coating itself was conductive, there was a huge interfacial resistance between it and the silicone anti-stick layer, making it almost electrically insulating. Therefore, the static charge on the surface could not be effectively conducted to the conductive bottom layer and dissipated, resulting in the test results showing that it almost completely lost its antistatic function. In Comparative Example 2, because no hydrophilic groups were introduced onto the polyurethane, the polymer could not form a stable dispersed emulsion in water. During the preparation process, it would directly precipitate from the water or form large gel particles, making it impossible to form a uniform and continuous thin film coating through the coating process. Even if a film was formed, the polyurethane itself did not have ionic conductivity, because the source of the ionic conductivity mechanism is precisely these hydrophilic ion centers. Comparative Example 3 replaced the specially designed modified polyurethane in the original scheme with ordinary, unfunctionalized polyurethane. Ordinary polyurethane is a typical insulating polymer material, and its molecular chain contains neither hydrophilic groups that provide ionic conductivity nor vinyl groups that can react with the upper organosilicon layer. Therefore, it cannot construct an effective conductive pathway, nor can it form a strong bond with the anti-stick layer. Comparative Example 4 did not add carbon nanotubes to the formulation, retaining only the modified polyurethane as the sole antistatic component. The ionicly conductive polymer itself can indeed provide a certain antistatic effect, causing the surface resistivity of the material to move away from the insulating region. However, the core design of this scheme is the synergistic effect of the two pathways. Without the efficient electronic conductive network constructed by carbon nanotubes, the electrostatic charge dissipation efficiency is greatly reduced, and it can only be completed by slower ion migration, ultimately reducing the antistatic effect.

[0049] Examples 6-9 refer to the parameter conditions in Example 1, with specific differences shown in Table 3.

[0050] Table 3 Parameters and conditions for Examples 1 and 6-9

[0051]

[0052] Comparative Example 5 follows the same parameters and conditions as in Example 1, except that the nano-silica is not modified.

[0053] Comparative Example 6 follows the same parameters and conditions as in Example 1, except that no modified silica is added.

[0054] Comparative Example 7 follows the same parameters and conditions as in Example 1, except that acrylate resin is used instead of silicone resin.

[0055] Comparative Example 8 follows the same parameters and conditions as in Example 1, except that no platinum catalyst is added.

[0056] Experiment Example 2: Anti-sticking performance test

[0057] The peel strength of Examples 1, 6-9 and Comparative Examples 5-8 was tested according to GB / T 2792-2014 standard, and the results are shown in Table 4.

[0058] Table 4. Anti-sticking performance of Examples 1, 6-9 and Comparative Examples 5-8

[0059] Example Peel force / N / 25 mm Example 1 0.36 Example 6 0.32 Example 7 0.35 Example 8 0.34 Example 9 0.34 Comparative Example 5 0.58 Comparative Example 6 0.47 Comparative Example 7 Unable to be completely peeled Comparative Example 8 Coating not cured

[0060] Table 4 shows that in Comparative Example 5, due to the lack of surface modification treatment on the nano-silica, the large number of hydroxyl groups on its surface makes it highly hydrophilic, completely incompatible with the hydrophobic organosilicon resin system. During coating preparation, the unmodified nano-silica undergoes severe agglomeration, forming particle clusters of varying sizes, which cannot be uniformly dispersed in the resin. These large clusters create numerous defects in the coating, compromising the smoothness of the anti-stick surface and acting as physical anchors that significantly hinder tape peeling. In Comparative Example 6, no modified silica was added, and the anti-stick function was entirely provided by the organosilicon resin. Although the organosilicon resin itself has excellent anti-stick properties, the role of the modified nano-silica is to construct a micro-nano-level surface rough structure to reduce the actual contact area of ​​the release liner, thereby achieving finer and lighter peel force control. Without the assistance of this physical structure, relying solely on the low surface energy at the chemical level cannot meet the requirements of anti-stick applications. Comparative Example 7 used ordinary acrylic resin instead of silicone resin. Ordinary acrylic resin is a conventional polymer with high surface energy and does not possess anti-sticking and isolating chemical properties. Therefore, when standard tape is applied to its surface, a permanent and strong bond is formed between the two. The force required is far greater than the strength of the tape substrate or PET film itself. As a result, the tape or release film substrate is directly torn or destroyed, while the adhesive interface cannot be separated. In Comparative Example 8, because no platinum catalyst was added, the hydrosilylation reaction in the silicone resin system could not be effectively catalyzed and initiated, and the cross-linking reaction could not occur. Ultimately, the coating applied to the substrate remained a liquid oily substance and could not cure to form a solid film with mechanical strength and a stable surface.

[0061] Examples 10-13 refer to the parameter conditions in Example 1, with specific differences shown in Table 5.

[0062] Table 5. Parameters and conditions for Examples 1 and 10-13

[0063]

[0064] Comparative Example 9 follows the same parameters and conditions as in Example 1, except that the PET film is not subjected to plasma treatment.

[0065] Comparative Example 10 follows the same parameters and conditions as in Example 1, except that the silane coupling agent KH-570 is not added.

[0066] Comparative Example 11 follows the same parameters and conditions as in Example 1, except that only UV-LED curing is performed.

[0067] Comparative Example 12 follows the same parameters and conditions as in Example 1, except that it is only heat-cured at 100°C.

[0068] Experiment Example 3: Aging Resistance Test

[0069] Samples were prepared and tested according to the test method in Experiment Example 2. After the test, the samples were placed in an oven and aged at 70°C for 24 hours. Then, they were cooled to room temperature and the peel strength was tested. The peel strength reduction rate was calculated. The results are shown in Table 6.

[0070] Table 6. Aging resistance of Examples 1, 10-13 and Comparative Examples 9-12

[0071] Example Peel strength reduction rate / % Example 1 6.7 Example 10 7.3 Example 11 7.1 Example 12 7.0 Example 13 6.8 Comparative Example 9 15.6 Comparative Example 10 18.3 Comparative Example 11 11.5 Comparative Example 12 9.4

[0072] Table 6 shows that in Comparative Example 9, because the PET substrate was not plasma-treated, the substrate surface was in a chemically inert state. This prevented the subsequent antistatic coating from bonding firmly with it through chemical bonds. During the 70℃ thermal aging process, interfacial stress was generated due to the difference in thermal expansion coefficients between the coating and the substrate. This bonding force could not effectively withstand the stress, and the destruction of this interfacial structure directly led to a sharp deterioration and instability in the peel strength performance after aging. In Comparative Example 10, the antistatic primer did not contain the silane coupling agent KH-570. KH-570 acts as a molecular bridge, reacting with the active groups on the substrate surface at one end and entangled or reacting with the polyurethane resin chain at the other end. It is crucial for forming a stable interfacial bond. Without this chemical bridge, the bonding force between the substrate and the coating decreased significantly. In Comparative Example 11, the curing process only used UV-LED irradiation. Although UV-LED curing technology is fast, its energy is mainly concentrated on the coating surface, and the light penetration depth is limited, making it difficult to ensure complete and thorough cross-linking within the coating. This results in an unstable network structure. Under the thermal aging conditions of 70°C, unreacted oligomers within the coating will migrate or undergo slow post-curing reactions, thereby altering the overall network structure and surface state of the coating, leading to a significant change in peel strength. In Comparative Example 12, the curing process only used 100°C baking. Although simple baking can ultimately ensure complete curing of the coating, in the initial stage of entering the oven, when the liquid coating is heated and its viscosity decreases, the micro-nano structure and uniform distribution of nano-silica on its surface will be disrupted or rearranged due to surface tension and flow. This suboptimal surface structure is more prone to subtle changes during thermal aging, leading to a decrease in peel strength stability.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an anti-sticking and antistatic separator, characterized in that: The preparation method includes the following steps: Pretreated substrate is obtained by plasma treatment of PET film; Modified polyurethane, carbon nanotubes, silane coupling agent and deionized water are mixed to obtain an antistatic coating layer; the antistatic coating is applied to the surface of the pretreated substrate to obtain an antistatic layer; The anti-stick coating is obtained by stirring and melting organosilicon resin, modified silica, crosslinking agent and platinum catalyst; the anti-stick coating is applied to the surface of the antistatic layer to obtain the anti-stick layer. The film coated with the anti-stick layer is subjected to a composite curing process to obtain the anti-stick and antistatic isolation film. The modified polyurethane is synthesized from isophorone diisocyanate, polytetrahydrofuran ether diol, dimethylolpropionic acid and hydroxyethyl methacrylate; the modified silica is obtained by modifying nano silica with silane coupling agent KH-560.

2. The method for preparing an anti-sticking and antistatic insulating film according to claim 1, characterized in that: The specific process of plasma treatment is as follows: during the treatment process, a mixture of argon and oxygen is introduced, and the PET film is placed in it for treatment to obtain the pretreated substrate.

3. The method for preparing an anti-sticking and antistatic insulating film according to claim 1, characterized in that: The specific preparation method of the antistatic layer is as follows: the modified polyurethane is placed in deionized water and stirred to obtain a polyurethane emulsion; the carbon nanotubes are placed in the deionized water and stirred to obtain a dispersion. Under stirring conditions, the dispersion was slowly added to the polyurethane emulsion, followed by the addition of silane coupling agent KH-570 and the deionized water, and the mixture was stirred to obtain the antistatic coating layer. The antistatic coating is applied to the surface of the pretreated substrate and then dried in an oven to obtain the antistatic layer.

4. The method for preparing an anti-sticking and antistatic separator according to claim 1, characterized in that: The modified polyurethane is prepared by adding the polytetrahydrofuran ether diol and the dimethylolpropionic acid to a flask, stirring and dehydrating under vacuum, then adding acetone to dissolve and obtain mixed solution A. Dibutyltin dilaurate was added to the mixed solution A, followed by the dropwise addition of isophorone diisocyanate. The reaction was carried out under heat to obtain a prepolymer solution. Hydroxyethyl methacrylate was added dropwise to the prepolymer solution. After the addition was complete, a reaction was carried out. Triethylamine was added after the reaction to obtain a mixed solution B. Deionized water was added to another container, and the mixed solution B was added under stirring conditions to obtain a homogeneous emulsion. The homogeneous emulsion was distilled under reduced pressure to obtain the modified polyurethane.

5. The method for preparing an anti-sticking and antistatic insulating film according to claim 1, characterized in that: The specific preparation method of the anti-stick layer is as follows: the modified silica is melt-dispersed into the first part of the organosilicon resin to obtain a pre-dispersion; then the pre-dispersion, the second part of the organosilicon resin, polymethylhydrosiloxane and caster catalyst are mixed to obtain the anti-stick coating; the anti-stick coating is applied on the antistatic layer to obtain the anti-stick layer.

6. The method for preparing an anti-sticking and antistatic separator according to claim 1, characterized in that: The specific preparation method of the modified silica is as follows: the silane coupling agent KH-560 is added to anhydrous ethanol and stirred to obtain a premix; deionized water is added to the premix and the pH of the system is adjusted to acidic, and the mixture is stirred to obtain a hydrolysis solution; The nano-silica was added to anhydrous ethanol and then sonicated to form a suspension. The suspension was transferred to a flask, and the hydrolysate was added dropwise under stirring. After the addition was complete, the reaction continued. After the reaction was completed, the mixture was cooled to room temperature, the solid product was separated by centrifugation, and the product was washed under vacuum to obtain the modified silica.

7. The method for preparing an anti-sticking and antistatic insulating film according to claim 1, characterized in that: The specific process of the composite curing treatment is as follows: the film coated with the anti-stick layer is first subjected to surface light anchoring in the UV-LED irradiation area, and then enters the hot drying tunnel for curing and cross-linking, finally obtaining the anti-stick and antistatic isolation film.

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