Preparation system for non-silicon modified polyester release film

Abstract

The utility model discloses a preparation system for a non-silicon modified polyester release film. The preparation system comprises a feeding reel for conveying a PET (Polyethylene Terephthalate) base film, a coating machine is arranged at the downstream of the feeding reel, an outlet of the coating machine is connected with a drying box, an outlet of the drying box is connected with a curing oven, and an outlet of the curing oven is connected with a winding machine; wherein the coating machine comprises a coating roller located below the PET base film, the lower portion of the coating roller is soaked in a release agent in a coating groove, the coating groove is connected with a release agent conveying tank through a pipeline, and the release agent conveying tank is connected with a release agent preparation device through a pipeline. The preparation system disclosed by the utility model provides a complete design scheme aiming at the technological process of the non-silicon modified polyester release film, covers all preparation links of conveying and burdening of raw materials, final coating, curing, rolling and the like, can realize continuous and efficient production of the non-silicon modified polyester release film, is suitable for industrial-scale production, and has a wide application prospect. And the method has expandability and a relatively high automation level.

Description

Technical Field

[0001] The utility model relates to a preparation system for non-silicon modified polyester release film. Background Art

[0002] Unlike traditional silicone-coated release films, non-silicone release films are based on polyester and undergo a special treatment to impart release properties. Non-silicone means that the surface is modified through other chemical methods rather than traditional silicone-based materials to achieve the desired release properties. Because they lack silicone, non-silicone release films offer excellent heat resistance, chemical stability, and mechanical strength, making them widely used in applications sensitive to silicone contamination.

[0003] For example, in the electronics industry, non-silicone release films are suitable for use in the production of sensitive electronic devices such as protective films and tapes to avoid silicon contamination and ensure stable product quality and performance. In the optoelectronics industry, for example, in the manufacture of displays and touch screens, non-silicone materials help avoid the effects of silicon on optical transparency and electrical properties. In the composite materials field, non-silicone release films can be used as release films in the manufacture of high-performance composite materials such as carbon fiber and glass fiber to ensure the demolding effect of materials during the molding process. In the medical and pharmaceutical fields, in the manufacture of medical packaging and patches with high cleanliness requirements, non-silicone release films can prevent silicon contamination and ensure hygiene and safety. In the automotive industry, non-silicone release films can be used in applications such as automotive interior parts and electronic components where silicon residues need to be avoided.

[0004] Existing non-silicone release films all have various shortcomings. For example, CN 102691231 B discloses a non-silicone release paper. The base film of the release paper of the prior art is made of polyethylene, which has obvious defects in heat resistance, chemical stability and mechanical strength. The release agent material has strong corrosion to the substrate and insufficient durability. CN 111548518 B discloses an ultra-light / super-heavy non-silicone release film. Among the main components of the release agent of the prior art, amino-modified acrylic resin and hydroxyl-containing acrylic resin are commonly used in adhesive formulations. The release effect may not be as significant as traditional fluorine-containing or silicon-containing release agents, and it is more suitable for application scenarios with low or medium release requirements. CN 108409994 B discloses a method for producing ultra-thin PI film using a non-silicone release film. A prominent disadvantage of this prior art is that the fluorine resin content is very low, the solvent treatment is complicated, and the high-temperature stability is insufficient. In applications that require higher temperature resistance, chemical stability and stronger release performance, this prior art may appear insufficient. Among them, although reducing the fluororesin content may improve the adhesion between the release agent and the substrate, it will also lead to insufficient overall release performance of the release layer, especially when facing highly viscous materials, this deficiency may be more obvious. In addition, the solubility of methyl isobutyl ketone and cyclohexanone in fluororesin is relatively weak, which may lead to unevenness in the release agent mixture. After the solvent evaporates, it may cause unstable release performance, manifested as local adhesion or poor release. In addition, the release agent of the prior art simply dissolves and disperses the fluororesin and applies it. The fluororesin component plays a release role only by its uniform dispersion in the solvent. The fluororesin does not undergo any chemical changes or effects. Under high temperature or harsh environment, it may show poor stability, and its heat resistance and durability are also insufficient.

[0005] In summary, the non-silicone release films in the prior art have various deficiencies and lack an optimized production process and a complete design scheme for the preparation system, making it impossible to continuously and efficiently prepare the non-silicone release films. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a preparation system for non-silicon modified polyester release film, so as to reduce or avoid the above-mentioned problems.

[0007] In order to solve the above technical problems, the utility model proposes a preparation system for non-silicone modified polyester release film, including a feed reel for conveying PET base film, a coater is arranged downstream of the feed reel, the outlet of the coater is connected to a drying oven, the outlet of the drying oven is connected to a curing oven, and the outlet of the curing oven is connected to a winder; wherein, the coater includes a coating roller located below the PET base film, the lower part of the coating roller is immersed in the release agent in the coating tank, the coating tank is connected to the release agent delivery tank through a pipeline, and the release agent delivery tank is connected to the release agent preparation device through a pipeline.

[0008] Preferably, the release agent preparation device includes a stainless steel mixing tank, the inlet of the stainless steel mixing tank is connected to the first material conveying tank and the second material conveying tank respectively through a material conveying pipe; the outlet of the stainless steel mixing tank is connected to the inlet of the high-speed mixing tank through a pipe, and the inlet of the high-speed mixing tank is also connected to the third material conveying tank through a material conveying pipe; the outlet of the high-speed mixing tank is connected to the vacuum defoaming tank through a pipe, and the outlet of the vacuum defoaming tank is connected to the release agent conveying tank through a pipe.

[0009] Preferably, a first agitator is provided in the stainless steel mixing tank, and the rotation speed of the first agitator is set to 50-100 RPM.

[0010] Preferably, the working temperature of the stainless steel mixing tank is set to 20-25°C.

[0011] Preferably, a second agitator is provided in the high-speed mixing tank, and the rotation speed of the second agitator is set to 500-800RPM.

[0012] Preferably, the setting working temperature of the drying oven is 80-100° C., and the drying time is 30-45 minutes.

[0013] Preferably, the setting working temperature of the curing oven is 150-180° C., and the curing time is 60-90 minutes.

[0014] The preparation system of the utility model proposes a complete design scheme for the process flow of non-silicone modified polyester release film, covering all preparation links from raw material transportation and batching to final coating, curing, winding, etc., which can realize the continuous and efficient production of non-silicone modified polyester release film, is suitable for industrial-scale production, and has scalability and a high level of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are only intended to illustrate and explain the present application, and are not intended to limit the scope of the present invention.

[0016] Figure 1 Shown is a structural schematic diagram of a system for preparing a non-silicon modified polyester release film according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, purpose and effects of the present invention, the specific implementation of the present invention is now described with reference to the accompanying drawings, wherein the same components are marked with the same reference numerals.

[0018] In view of the defects of the existing technology, the utility model proposes a preparation system for non-silicone modified polyester release film. The preparation system proposes a complete design scheme for the entire process of non-silicone modified polyester release film, which can realize the continuous and efficient production of non-silicone modified polyester release film.

[0019] Figure 1 A schematic diagram shows the structure of a system for preparing a non-silicone-modified polyester release film according to a specific embodiment of the present invention. This system provides a comprehensive design solution for the entire process of release agent preparation, feeding, coating, drying, and curing. Before describing the preparation system in detail, it is necessary to explain the composition, structure, and process characteristics of the release film in this invention. This will help those skilled in the art understand the creative improvements made by the preparation system in this invention to address the structural characteristics of the release film.

[0020] Specifically, the non-silicone-modified polyester release film prepared by the preparation system of the present invention comprises a polyester base film and a release agent layer coated on one surface of the polyester base film. The release agent layer is formed by curing a non-silicone-modified release agent. The polyester base film preferably uses a PET base film with a thickness of 50-100 μm, and the release agent layer has a thickness of 5-7 μm.

[0021] In a specific embodiment, the release agent of the release film prepared by the preparation system of the present invention is composed of perfluoroalkyl acrylate copolymer, hexafluoropropylene, aluminum oxide nanoparticles and 2,2,3,3-tetrafluoropropanol.

[0022] In another specific embodiment, the components of the release agent are as follows: 70-80 parts by weight of a perfluoroalkyl acrylate copolymer, 10-20 parts by weight of hexafluoropropylene, 3-7 parts by weight of aluminum oxide nanoparticles, and 3-7 parts by weight of 2,2,3,3-tetrafluoropropanol. The aluminum oxide nanoparticles have a particle size of 10-50 nm.

[0023] The perfluoroalkyl acrylate copolymer can be FLOVIAC 9000 from Solvay (Belgium), which exhibits excellent anti-adhesion properties. Hexafluoropropylene can undergo a cross-linking reaction with the perfluoroalkyl acrylate at high temperatures, thereby modifying the fluororesin. This modification can increase the cross-linking density of the coating and enhance the heat and chemical resistance of the release film.

[0024] The release film prepared by the preparation system of the present invention can be prepared by the following process.

[0025] 1. Preparation of non-silicone modified release agent

[0026] Temperature: 20-25℃.

[0027] Humidity: Control in an environment where no moisture enters.

[0028] step:

[0029] 70-80 parts by weight of perfluoroalkyl acrylate copolymer was placed in a stainless steel mixing tank.

[0030] Add 10-20 parts by weight of hexafluoropropylene (HFP) and stir at a speed of 50-100 RPM for 30-40 minutes.

[0031] Slowly add 3-7 parts by weight of 2,2,3,3-tetrafluoropropanol and continue stirring until a uniform transparent solution is obtained. The stirring time is 20-40 minutes.

[0032] The transparent solution was transferred to a high-speed mixing tank, 3-7 parts by weight of aluminum oxide nanoparticles (particle size 10-50 nm) were added and evenly dispersed in the solution, and high-speed stirring was used, with a stirring speed of 500-800 RPM for 60 minutes to ensure that the nanoparticles were evenly dispersed.

[0033] 2. Coating process

[0034] Substrate: Polyester (PET) film, thickness 50-100μm.

[0035] Coating method: roller coating

[0036] Film thickness range: 5-7μm, the specific film thickness is precisely controlled by adjusting the solution concentration and coating parameters.

[0037] 3. Drying and curing

[0038] First stage drying:

[0039] Temperature: 80-100℃, time: 30-45 minutes

[0040] Purpose: To evaporate the solvent and ensure an even coating.

[0041] Second stage heat treatment (cross-linking and curing):

[0042] Temperature: 150-180℃, time: 60-90 minutes

[0043] Purpose: To modify the release film by cross-linking hexafluoropropylene with perfluoroalkyl acrylate to enhance its mechanical properties, heat resistance and chemical resistance.

[0044] The principle of the above preparation process is described in detail as follows.

[0045] Specifically, hexafluoropropylene (C3F6) is a fluorinated monomer with the following structure:

[0046] CF2=CF-CF3

[0047] The presence of a double bond in the molecule makes it highly reactive, particularly at high temperatures, and readily cross-links with other monomers. Because the fluorine atoms in hexafluoropropylene occupy a large space, the molecular surface energy is low, enhancing the material's hydrophobicity and release properties.

[0048] Perfluoroalkyl acrylate copolymers generally have the following basic structure:

[0049] [R f -(C=O)-OR] n

[0050] Among them, R f Fluorinated alkyl chains, such as perfluoroethyl and perfluoropropyl, can impart low surface energy and excellent chemical resistance to the copolymer. The carbonyl (C=O) and oxygen (O) groups in the polymer provide potential crosslinking sites for reaction.

[0051] The cross-linking reaction of hexafluoropropylene and perfluoroalkyl acrylate copolymers is usually carried out under heating conditions. The double bonds in hexafluoropropylene are opened, and addition or cross-linking reactions occur with the active groups of the perfluoroalkyl acrylate copolymer (such as the carbonyl or hydroxyl groups in the acrylate), forming a more compact three-dimensional cross-linked network. The cross-linking reaction can be achieved through free radical polymerization or cationic polymerization mechanisms. This includes: at high temperatures, the double bonds in hexafluoropropylene are broken, generating free radicals. The generated free radicals attack the active sites in the perfluoroalkyl acrylate copolymer (such as the carbonyl or oxygen groups in the acrylate), resulting in cross-linking between the perfluoroalkyl acrylate chain segments. This cross-linking reaction connects different perfluoroalkyl acrylate molecules together through hexafluoropropylene, forming a three-dimensional network structure and increasing the cross-linking density of the material.

[0052] The cross-linking reaction can be expressed as the following chemical equation:

[0053] CF2=CF-CF3+R f -(C=O)-OR→CF2-CF-CF3-(R f -(C=O)-OR) n

[0054] Among them, CF2=CF-CF3 is hexafluoropropylene, R f -(C=O)-OR is the basic unit of perfluoroalkyl acrylate copolymers.

[0055] This crosslinking strengthens the film's structure, significantly improving its chemical resistance, mechanical strength, and heat resistance. This is because crosslinking increases the intermolecular forces within the film, reduces the number of free chains within the material, and thus enhances the overall structural stability. The crosslinked structure formed by the thermal decomposition of free radicals significantly enhances the film's heat resistance and release properties. This crosslinking ensures that the release film maintains excellent mechanical properties and stable release properties even in high-temperature, high-pressure, and chemically corrosive environments.

[0056] 2,2,3,3-Tetrafluoropropanol has low volatility and extremely high chemical stability, ensuring uniform coating and stable performance of the release agent. Aluminum oxide nanoparticles can be used to enhance the mechanical strength and wear resistance of the release film. Increasing their proportion can improve the film's wear resistance, but excessive amounts can affect the release agent's fluidity and uniformity. Therefore, controlling the particle size within the 10-50 nm range ensures a smooth surface while maintaining mechanical properties.

[0057] In this application, aluminum oxide nanoparticles have extremely high hardness and strength, which can significantly improve the wear resistance, scratch resistance and mechanical strength of the release film. In high friction or repeated use scenarios, release films containing aluminum oxide can maintain more stable performance. This enhancement is achieved by dispersing nanoparticles in a fluorine-based release agent to form a microscopic skeleton structure, thereby achieving mechanical reinforcement of the coating. Although other fillers such as silica, carbon nanotubes, etc. can also enhance mechanical properties, the nano-microscopic morphology of aluminum oxide can be better distributed in the fluorine-containing polymer matrix while maintaining compatibility with the PET film without affecting the low surface energy of the fluorine-based material.

[0058] Generally speaking, PET base film itself has good mechanical strength and chemical corrosion resistance, but its surface wettability is poor, resulting in insufficient adhesion of the release agent. Alumina nanoparticles have a certain degree of surface activity. Through hydrogen bonds or van der Waals forces that may exist on the PET surface, they can improve the bonding strength between the release agent and the PET base film. Nanoalumina (Al2O3) particles are a metal oxide with a porous structure and a large specific surface area. Their surface typically exposes metallic aluminum atoms and oxygen atoms. At room temperature and pressure, the aluminum oxide surface undergoes physical or chemical adsorption with water molecules in the environment, and the water molecules dissociate on the aluminum oxide surface to form hydroxyl groups (–OH). This adsorption and dissociation process forms different types of hydroxyl groups on the aluminum oxide surface, such as monohydroxyl and dihydroxyl groups.

[0059] Hydroxylated aluminum oxide further enhances its compatibility with PET film, enabling it to act as a bonding bridge between the release agent and the PET base film. Compared to other fillers, aluminum oxide's chemical inertness and hydroxylation give it greater flexibility and compatibility when combined with PET base films. The surface chemical structure of aluminum oxide nanoparticles enables it to maintain high chemical resistance while enhancing adhesion to the PET base film through surface hydroxylation. This bonding ability gives it a unique advantage in high-performance release films, an effect that cannot be achieved with alternative materials (such as silica or inorganic fillers).

[0060] Furthermore, aluminum oxide does not exhibit significant chemical reactions or strong interactions with perfluoroalkyl acrylates. However, precisely because of this chemical inertness, it can be evenly dispersed in fluorine-based materials, without interfering with the release properties of the fluoride, contributing to a smoother and more uniform coating surface. Furthermore, due to its high hardness, aluminum oxide can improve the wear resistance and durability of the coating through physical reinforcement. Other fillers, such as carbon-based materials or polymer fillers, may react with fluorides at high temperatures or in chemical environments, or their surface properties may affect the uniformity of fluoride distribution and coating performance. The chemical inertness and high-temperature resistance of aluminum oxide nanoparticles make them more stable in such applications. With a melting point exceeding 2000°C, aluminum oxide exhibits excellent thermal stability. In applications requiring high-temperature curing or operating in high-temperature environments, the addition of aluminum oxide nanoparticles can significantly improve the heat resistance and dimensional stability of release films. Furthermore, their high thermal conductivity helps dissipate heat from the coating at high temperatures, maintaining the overall structural stability of the film. In contrast, other nanofillers (such as organic polymers or carbon-based materials) may degrade or decompose at high temperatures, affecting the overall performance of the release film. The high thermal stability and chemical corrosion resistance of aluminum oxide make it particularly suitable for use in release films that require high temperature and high stability.

[0061] With a clear understanding of the structure, principle and process flow of the release film to be prepared by the preparation system of the present invention, the complete structure of the preparation system of the present invention will be described in detail below with reference to the accompanying drawings.

[0062] As shown in the figure, the system for preparing non-silicon modified polyester release film of the present invention includes a feeding reel 300 for conveying PET base film, which is used to place a large roll of PET base film. The thickness of the PET base film is 50-100 μm.

[0063] Downstream of the feed reel 300, a coating machine 400 is located for applying a release agent to one side of the PET base film. In the illustrated embodiment, the coating machine 400 includes a coating roller 41 positioned below the PET base film. The lower portion of the coating roller 41 is immersed in the release agent in a coating tank 42. The rotation of the coating roller 41 transfers the release agent from the coating tank 42 to the lower surface of the PET base film. The coating tank 42 is connected to the release agent delivery tank 22 via a pipe.

[0064] Furthermore, the release agent delivery tank 22 is connected to the release agent preparation device via a pipeline. The release agent preparation device includes a stainless steel mixing tank 100, which is used to mix and stir the input perfluoroalkyl acrylate copolymer and hexafluoropropylene, and then transfer them to the high-speed mixing tank 200. The stainless steel mixing tank 100 is equipped with a first agitator 101, which is set to a speed of 50-100 RPM and an operating temperature of 20-25°C.

[0065] The inlet of the stainless steel mixing tank 100 is connected to the first material conveying tank 10 and the second material conveying tank 11 through material conveying pipes, wherein the first material conveying tank 10 and the second material conveying tank 11 are used to store and convey perfluoroalkyl acrylate copolymer and hexafluoropropylene, respectively.

[0066] The outlet of the stainless steel mixing tank 100 is connected via a pipe to the inlet of a high-speed mixing tank 200. This inlet is also connected via a material delivery pipe to a third material delivery tank 20, which is used to store and deliver aluminum oxide nanoparticles. The high-speed mixing tank 200 disperses the input aluminum oxide nanoparticles into a mixed solution of perfluoroalkyl acrylate copolymer and hexafluoropropylene at high speed, ensuring uniform dispersion of the nanoparticles. A second agitator 201 is provided within the high-speed mixing tank 200, set at a speed of 500-800 RPM.

[0067] In order to ensure that the raw materials are mixed in proportion, flow control valves are provided in the material conveying pipelines of the above three materials.

[0068] The outlet of high-speed mixing tank 200 is connected via a pipe to vacuum defoaming tank 21, which is used to perform vacuum defoaming on the uniformly mixed material. After the mixed material is input into vacuum defoaming tank 21, a vacuum pump is used to evacuate the tank 21 to remove bubbles in the solution and ensure a smooth, defect-free surface after coating.

[0069] The outlet of the vacuum defoaming tank 21 is connected to the release agent delivery tank 22 through a pipeline, so as to transfer the release agent after defoaming treatment to the release agent delivery tank 22 so as to continuously deliver the release agent to the coating tank 42 of the coater 400 .

[0070] The outlet of the coating machine 400 is connected to the drying oven 500 , the outlet of the drying oven 500 is connected to the curing oven 600 , and the outlet of the curing oven 600 is connected to the winder 700 .

[0071] The PET base film coated with the release agent by the coater 400 is further transported to the drying oven 500, then transported to the curing oven 600, and finally wound by the winder 700 to prepare the non-silicon modified polyester release film of the present application.

[0072] The drying oven 500 is used to quickly evaporate the solvent. The set working temperature of the drying oven 500 is 80-100° C. and the drying time is 30-45 minutes.

[0073] Curing oven 600 is used to cure the applied release agent layer at high temperature, ensuring sufficient crosslinking between hexafluoropropylene and perfluoroalkyl acrylate, thereby improving the film's mechanical properties and chemical stability. The set operating temperature of curing oven 600 is 150-180°C, and the curing time is 60-90 minutes.

[0074] In the overall layout of the preparation system, raw material storage and delivery pipelines can be centrally arranged on one side of the workshop to facilitate the transportation of raw materials. The mixing and dispersing system can be located in the center, close to the raw materials and coating equipment, to reduce the material transportation path. The coating, drying, and curing equipment can be arranged in sequence, with automatic conveyor belts to sequentially deliver the coated film to the drying and curing areas. In short, the preparation system of the utility model proposes a complete design scheme for the process flow of non-silicone modified polyester release film, covering all aspects of the preparation from raw material transportation and batching to final coating, curing, winding, etc., which can realize the continuous and efficient production of non-silicone modified polyester release film, is suitable for industrial-scale production, and has scalability and a high level of automation.

[0075] The performance parameters of the release film prepared by the preparation system of the present application are as follows: Release force: 0.03-0.07N / 10mm, suitable for a variety of materials with different viscosities. Easy to peel off without damaging the protected surface of sensitive parts. Heat resistance: Can withstand high temperatures of 250-280°C without performance degradation. Surface energy: 10-15mN / m, extremely low surface energy, ensuring good release performance. Chemical resistance: Excellent tolerance to common acids, alkalis, solvents and other chemicals. Abrasion resistance: Higher than traditional silicone-based release films, suitable for multiple uses or high-friction environments.

[0076] The following table lists the weight parameters for preparing non-silicone modified polyester release films, and the release film parameters are measured.

[0077] The names of some raw materials in the examples and subsequent comparative examples are represented by the following abbreviations or codes.

[0078] Perfluoroalkyl acrylate copolymer: A Hexafluoropropylene: HFP

[0079] Alumina nanoparticles: Al2O3 2,2,3,3-tetrafluoropropanol: TFP

[0080] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 A 70 75 80 0 75 80 HFP 10 15 20 10 0 20 <![CDATA[Al2O3]]> 3 5 7 3 5 7 TFP 3 5 7 3 5 0 Release force N / 10mm 0.07 0.05 0.03 0.2 0.15 0.2 surface energy 15mN / m 12mN / m 10mN / m 45mN / m 35mN / m 40mN / m Decomposition temperature 312℃ 313℃ 315℃ 203℃ 247℃ 263℃

[0081] In Examples 1 to 3, the content of the perfluoroalkyl acrylate copolymer ranged from 70 to 80 parts by weight. As its content increased, the surface energy of the film gradually decreased (from 15 mN / m to 10 mN / m), significantly improving the release performance. In Comparative Example 1, no perfluoroalkyl acrylate was added, resulting in a significant increase in release force (0.2 N / 10 mm), indicating that the material had lost its release properties and could not even meet the required performance standards. This further demonstrates that a higher content of perfluoroalkyl acrylate copolymer can significantly reduce the surface energy of the release film, enhancing its release performance and chemical resistance.

[0082] In Examples 1 to 3, the hexafluoropropylene content ranged from 10 to 20 parts by weight. As its content increased, the release force gradually decreased (from 0.07 N / 10 mm to 0.03 N / 10 mm), while the decomposition temperature increased to 315°C. A higher hexafluoropropylene content enhanced the crosslinking density, resulting in higher stability and better mechanical strength in high-temperature and chemical environments. In contrast, in Comparative Example 2, no hexafluoropropylene was added, resulting in a lower decomposition temperature of 247°C, indicating that the film's heat resistance and chemical stability were significantly insufficient. This further demonstrates that the hexafluoropropylene content is closely related to the mechanical properties, heat resistance, and release effect of the release film.

[0083] In Examples 1 to 3, the content of 2,2,3,3-tetrafluoropropanol ranged from 3 to 7 parts by weight. As the content increased, the surface coating of the film became more uniform, leaving less residual solvent after coating, which improved the film's smoothness and release performance. In Comparative Example 3, where no tetrafluoropropanol was added, the film's release performance was poor, as evidenced by a release force increase of 0.2 N / 10 mm and a significant increase in surface energy of 40 mN / m, indicating an uneven surface treatment. This demonstrates that tetrafluoropropanol can significantly improve the coating uniformity and stability of release films, helping to form a more stable and uniform release agent layer and improving the film's overall performance.

[0084] In addition, the chemical resistance and wear resistance of the release films of the above examples and comparative examples were tested respectively. Examples 1-3 had excellent resistance to common chemicals such as acids, alkalis, and solvents. In contrast, Comparative Examples 1 and 2 had significantly poor chemical stability due to the lack of modified cross-linking of perfluoroalkyl acrylate copolymers and hexafluoropropylene, and were easily destroyed by polar solvents under the same test conditions.

[0085] In addition, based on Examples 1-3, aluminum oxide was replaced by silicon dioxide, carbon nanotubes, and graphene, respectively, and the relevant performance indicators were tested and shown in the following table.

[0086] Comparative Example 4 Comparative Example 5 Comparative Example 6 A 70 75 80 HFP 10 15 20 <![CDATA[Al2O3]]> <![CDATA[3(SiO2)]]> 5 (carbon nanotubes) 7(Graphene) TFP 3 5 7 Release force N / 10mm 0.09 0.11 0.13 surface energy 39mN / m 31mN / m 33mN / m Decomposition temperature 265℃ 273℃ 254℃

[0087] In Examples 1 to 3, the particle size of the aluminum oxide nanoparticles is controlled to be 10-50nm, and the content is 3-7 parts by weight. As the content increases, the wear resistance and scratch resistance of the release film are significantly improved. At the same time, when the particle size of the aluminum oxide nanoparticles is smaller, its dispersion performance is better, and a uniform micro-skeleton structure can be formed in the substrate, thereby enhancing the mechanical strength of the film. In Comparative Examples 4-6, after replacing aluminum oxide with other materials (such as silicon dioxide, carbon nanotubes, graphene), the decomposition temperature and surface energy of the film decrease to some extent, indicating that aluminum oxide nanoparticles play an important role in improving the heat resistance, chemical stability and release performance of the film. It is further explained that the particle size and content of the aluminum oxide nanoparticles are crucial to the mechanical properties and wear resistance of the film, and are conducive to enhancing the overall structure and release effect of the film.

[0088] The tests of Comparative Examples 4-6 show that silicon dioxide, carbon nanotubes and graphene have significantly lower decomposition stability and surface energy than aluminum oxide.

[0089] In addition, the wear resistance and coating firmness of Comparative Examples 1-6 were significantly lower than those of Examples 1-3. The smoothness and uniformity of the release agent layer surface were also significantly better than those of Comparative Examples 4-6.

[0090] By optimizing the content and particle size of these components, the release films in the examples exhibited excellent release effect, mechanical properties, and heat resistance, while the performance in the comparative examples was significantly insufficient, indicating that the regulation of these components in the formulation is crucial to the performance of the final film.

[0091] In summary, the non-silicon modified polyester release film of this application utilizes a heat-crosslinked modification system of perfluoroalkyl acrylate and hexafluoropropylene, enhancing the mechanical properties, heat resistance, and chemical resistance of the release film. Furthermore, the introduction of nano-alumina enhances the mechanical properties and wear resistance of the release film while avoiding silicon contamination. The 2,2,3,3-tetrafluoropropanol in the formulation ensures uniform coating and stable performance of the release agent. The release film prepared in this application is suitable for applications with strict requirements for release performance and cleanliness, such as optical films, precision electronic equipment, and medical device packaging.

[0092] Those skilled in the art should understand that although the present invention is described in terms of multiple embodiments, not each embodiment contains only one independent technical solution. This description is provided for clarity only. Those skilled in the art should understand the description as a whole and consider the technical solutions involved in each embodiment as being combinable into different embodiments to understand the scope of protection of the present invention.

[0093] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A system for preparing non-silicon modified polyester release film, characterized in that: The preparation system includes a feed reel for conveying PET base film, a coater is provided downstream of the feed reel, the outlet of the coater is connected to a drying oven, the outlet of the drying oven is connected to a curing oven, and the outlet of the curing oven is connected to a winder; wherein, the coater includes a coating roller located below the PET base film, the lower part of the coating roller is immersed in the release agent in the coating tank, the coating tank is connected to the release agent delivery tank through a pipeline, and the release agent delivery tank is connected to the release agent preparation device through a pipeline.

2. The preparation system according to claim 1, wherein: The release agent preparation device includes a stainless steel mixing tank, the inlet of the stainless steel mixing tank is connected to the first material conveying tank and the second material conveying tank respectively through a material conveying pipe; the outlet of the stainless steel mixing tank is connected to the inlet of the high-speed mixing tank through a pipe, and the inlet of the high-speed mixing tank is also connected to the third material conveying tank through a material conveying pipe; the outlet of the high-speed mixing tank is connected to the vacuum defoaming tank through a pipe, and the outlet of the vacuum defoaming tank is connected to the release agent conveying tank through a pipe.

3. The preparation system according to claim 2, wherein: A first agitator is provided in the stainless steel mixing tank, and the rotation speed of the first agitator is set to 50-100 RPM.

4. The preparation system according to claim 2, wherein: The working temperature of the stainless steel mixing tank is set at 20-25℃.

5. The preparation system according to claim 2, wherein: A second agitator is provided in the high-speed mixing tank, and the rotation speed of the second agitator is set to 500-800RPM.

6. The preparation system according to claim 1, wherein: The set working temperature of the drying oven is 80-100℃ and the drying time is 30-45 minutes.

7. The preparation system according to claim 1, wherein: The set working temperature of the curing oven is 150-180℃ and the curing time is 60-90 minutes.

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