Non-silicon modified polyester release film and preparation method thereof

Abstract

The invention discloses a non-silicon modified polyester release film and a preparation method thereof, the non-silicon modified polyester release film is composed of a polyester base film and a release agent layer coated on one side surface of the polyester base film, the release agent layer is formed by curing a non-silicon modified release agent, the non-silicon modified release agent is prepared from a perfluoroalkyl acrylate copolymer, hexafluoropropylene, aluminum oxide nanoparticles and 2, 2, 3, 3-tetrafluoropropanol. According to the non-silicon modified polyester release film, a heating crosslinking modification system of perfluoroalkyl acrylate and hexafluoropropylene is adopted, so that the mechanical property, heat resistance and chemical resistance of the release film are enhanced. And through introduction of nanoscale aluminum oxide, the mechanical property and wear resistance of the release film are enhanced, and silicon pollution is avoided at the same time. The release film prepared by the invention is suitable for the fields with strict requirements on release performance and cleanliness, such as optical films, precision electronic equipment and medical instrument packaging.

Description

Technical Field

[0001] The present invention relates to the technical field of release films, and in particular to a non-silicon modified polyester release film and a preparation method thereof. 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] In summary, non-silicone release films are typically used in industries sensitive to materials like silicon. They must be free of silicon-based substances to prevent performance degradation caused by silicon contamination, particularly in the semiconductor and optical fields. They are suitable for production processes that are extremely sensitive to silicon contamination and are an essential material in some high-end industrial fields.

[0005] For example, CN 102691231 B discloses a non-silicone release paper comprising, from bottom to top, a plastic coating layer, a base paper, a plastic coating layer, and a non-silicone release layer. The non-silicone release layer is produced by coating a carbamate solution in toluene or 120# industrial gasoline, with the carbamate having a mass fraction of 1-10%; the carbamate is polyethylene octadecyl carbamate. The base film of this prior art release paper is made of polyethylene, which has significant deficiencies in heat resistance, chemical stability, and mechanical strength. The release agent material is highly corrosive to the substrate, resulting in insufficient durability.

[0006] CN 111548518 B discloses an ultra-light / ultra-heavy non-silicone release film, comprising a substrate layer, an antistatic primer coated on the substrate layer, and a non-silicone release coating coated on the antistatic primer. The non-silicone release coating is prepared from the following components, in parts by weight: 500-1000 parts of an ester solvent, 50-500 parts of a ketone solvent, 0-300 parts of an amino-modified acrylic resin, 0-300 parts of a hydroxyl-containing acrylic resin, and 5-50 parts of a curing agent, wherein the total amount of the amino-modified acrylic resin and the hydroxyl-containing acrylic resin is 300 parts. The viscosity of the amino-modified acrylic resin is 100-300 cps and the molecular weight is 30,000-60,000; the viscosity of the hydroxyl-containing acrylic resin is 200-500 cps and the molecular weight is 40,000-70,000. Among the main components of the release agent of the prior art, amino-modified acrylic resin and hydroxyl-containing acrylic resin are commonly found in adhesive formulations. The release effect may not be as significant as that of traditional fluorine-containing or silicon-containing release agents, and is more suitable for application scenarios with low or medium release requirements.

[0007] CN 108409994 B discloses a method for producing ultrathin PI film using a non-silicone release film. The production steps of the non-silicone release film are as follows: first, mix 25 parts of a polycarbonate resin with a solid content of 40%; then, add 25 parts of methyl isobutyl ketone and 17 parts of cyclohexanone; stir until uniform; then, add fluororesins ethylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer, and polyvinyl fluoride at a mass ratio of 1 / 10,000; stir at 1000 rpm for 30 minutes, and disperse at high speed to obtain a mixture; then, pour the prepared mixture into the coating trough of a coating machine, and coat the mixture onto a polyethylene terephthalate plastic film at a speed of 50-60 m / min to produce the non-silicone release film. A significant disadvantage of this prior art is the very low fluororesin content, complex solvent handling, and insufficient high-temperature stability. This prior art may be insufficient in applications requiring higher temperature resistance, chemical stability, and enhanced release properties. 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. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a non-silicon modified polyester release film and a preparation method thereof, so as to reduce or avoid the above-mentioned problems.

[0009] In order to solve the above technical problems, the present invention proposes a non-silicone modified polyester release film, which is composed of a polyester base film and a release agent layer coated on one side surface of the polyester base film, wherein the release agent layer is formed by curing a non-silicone modified release agent, wherein the non-silicone modified release agent is composed of a perfluoroalkyl acrylate copolymer, hexafluoropropylene, aluminum oxide nanoparticles and 2,2,3,3-tetrafluoropropanol.

[0010] Preferably, the contents of the components in the non-silicon modified release agent are: 70-80 parts by weight of 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.

[0011] Preferably, the particle size of the aluminum oxide nanoparticles is 10-50 nm.

[0012] The present invention also proposes a method for preparing a non-silicon modified polyester release film, including the steps of preparing a non-silicon modified release agent and coating the prepared non-silicon modified release agent on one side surface of a polyester film, wherein the step of preparing the non-silicon modified release agent includes: taking 70-80 parts by weight of a perfluoroalkyl acrylate copolymer and placing it into a stainless steel mixing tank; adding 10-20 parts by weight of hexafluoropropylene and stirring; adding 3-7 parts by weight of 2,2,3,3-tetrafluoropropanol and continuing to stir until a uniform transparent solution is obtained; adding 3-7 parts by weight of aluminum oxide nanoparticles and uniformly dispersing them in the solution.

[0013] Preferably, the preparation of the non-silicon modified release agent is carried out in an environment where humidity is controlled to be free of moisture and the temperature is 20-25°C.

[0014] Preferably, the stirring speed of adding hexafluoropropylene is between 50-100 RPM and the stirring time is 30-40 minutes.

[0015] Preferably, the particle size of the added aluminum oxide nanoparticles is 10-50 nm, and the stirring speed of the aluminum oxide nanoparticles is 500-800 RPM for 60 minutes.

[0016] Preferably, the preparation method further comprises the steps of drying the coated non-silicon modified release agent and then subjecting it to heat treatment for curing.

[0017] Preferably, the drying temperature is 80-100° C. and the drying time is 30-45 minutes.

[0018] Preferably, the temperature during the heat treatment curing is 150-180° C., and the time is 60-90 minutes.

[0019] The non-silicone-modified polyester release film of the present invention utilizes a heat-crosslinked modification system of perfluoroalkyl acrylate and hexafluoropropylene, enhancing the film's mechanical properties, heat resistance, and chemical resistance. Furthermore, the introduction of nano-alumina enhances the film's mechanical properties and wear resistance while preventing silicon contamination. The release film produced by the present invention is suitable for applications requiring stringent release performance and cleanliness, such as optical films, precision electronic equipment, and medical device packaging. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described in detail by way of specific embodiments.

[0021] In view of the shortcomings of the prior art, the present invention proposes a non-silicone modified polyester release film, comprising 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 is preferably a PET base film with a thickness of 50-100 μm.

[0022] Specifically, this invention proposes a non-silicone modified release agent. This innovative formulation and preparation process leverages the unique low surface energy properties of fluorides and combines them with the heat resistance and mechanical properties of polymer materials. The following is a detailed formulation and process design, which ensures high stability and repeatability, and provides excellent release performance in high-temperature and high-pressure environments.

[0023] In a specific embodiment, the non-silicone modified release agent of the present invention is composed of a perfluoroalkyl acrylate copolymer, hexafluoropropylene, aluminum oxide nanoparticles, and 2,2,3,3-tetrafluoropropanol.

[0024] 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.

[0025] Specifically, hexafluoropropylene (C3F6) is a fluorinated monomer with the following structure:

[0026] CF2=CF-CF3

[0027] 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.

[0028] Perfluoroalkyl acrylate copolymers generally have the following basic structure:

[0029] [R f -(C=O)-OR] n

[0030] 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.

[0031] 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.

[0032] The cross-linking reaction can be expressed as the following chemical equation:

[0033] CF2=CF-CF3+R f -(C=O)-OR→CF2-CF-CF3-(R f -(C=O)-OR) n

[0034] Among them, CF2=CF-CF3 is hexafluoropropylene, R f -(C=O)-OR is the basic unit of perfluoroalkyl acrylate copolymers.

[0035] 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.

[0036] 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.

[0037] In the present invention, 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.

[0038] 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.

[0039] 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).

[0040] 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.

[0041] In one embodiment, the non-silicone modified release agent of the present invention comprises: 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.

[0042] In another specific embodiment, the non-silicone modified polyester release film of the present invention can be prepared by the following method, which includes the following steps.

[0043] 1. Preparation of non-silicone modified release agent

[0044] Temperature: 20-25℃.

[0045] Humidity: Control in an environment where no moisture enters.

[0046] step:

[0047] 70-80 parts by weight of perfluoroalkyl acrylate copolymer was placed in a stainless steel mixing tank.

[0048] Add 10-20 parts by weight of hexafluoropropylene (HFP) and stir at a speed of 50-100 RPM for 30-40 minutes.

[0049] 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.

[0050] 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.

[0051] 2. Coating process

[0052] Substrate: Polyester (PET) film, thickness 50-100μm.

[0053] Coating method: roller coating

[0054] Film thickness range: 5-7μm, the specific film thickness is precisely controlled by adjusting the solution concentration and coating parameters.

[0055] 3. Drying and curing

[0056] First stage drying:

[0057] Temperature: 80-100℃, time: 30-45 minutes

[0058] Purpose: To evaporate the solvent and ensure an even coating.

[0059] Second stage heat treatment (cross-linking and curing):

[0060] Temperature: 150-180℃, time: 60-90 minutes

[0061] Purpose: To modify the release film by cross-linking hexafluoropropylene with perfluoroalkyl acrylate to enhance its mechanical properties, heat resistance and chemical resistance.

[0062] 4. Release film parameter measurement

[0063] Release force: 0.03-0.07N / 10mm, suitable for a variety of materials with different viscosities. Easy to peel without damaging the protected surface of sensitive parts.

[0064] Heat resistance: can withstand high temperature of 250-280℃ without performance degradation.

[0065] Surface energy: 10-15mN / m, extremely low surface energy, ensuring good release performance.

[0066] Chemical resistance: Excellent resistance to common acids, alkalis, solvents and other chemicals.

[0067] Abrasion resistance: Higher than traditional silicone-based release films, suitable for multiple uses or high-friction environments.

[0068] The following table lists the weight parameters for preparing non-silicone modified polyester release films, and the release film parameters are measured.

[0069] The names of some raw materials in the examples and subsequent comparative examples are represented by the following abbreviations or codes.

[0070] Perfluoroalkyl acrylate copolymer: A Hexafluoropropylene: HFP

[0071] Alumina nanoparticles: Al2O3 2,2,3,3-tetrafluoropropanol: TFP

[0072] 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℃

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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. 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℃

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In summary, the non-silicone modified polyester release film of the present invention utilizes a heat-crosslinked modification system of perfluoroalkyl acrylate and hexafluoropropylene, enhancing the film's mechanical properties, heat resistance, and chemical resistance. Furthermore, the introduction of nano-alumina enhances the film's mechanical properties and wear resistance 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 by the present invention is suitable for applications requiring strict release performance and cleanliness, such as optical films, precision electronic equipment, and medical device packaging.

[0083] 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.

[0084] 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 those 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 non-silicone modified polyester release film, comprising a polyester base film and a release agent layer coated on one side of the polyester base film, wherein the release agent layer is formed by curing a non-silicone modified release agent, characterized in that: The non-silicon modified release agent consists of perfluoroalkyl acrylate copolymer, hexafluoropropylene, aluminum oxide nanoparticles and 2,2,3,3-tetrafluoropropanol.

2. The non-silicone modified polyester release film according to claim 1, wherein: The contents of the components in the non-silicon modified release agent are: 70-80 parts by weight of 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.

3. The non-silicone modified polyester release film according to claim 1, wherein: The particle size of the aluminum oxide nanoparticles is 10-50 nm.

4. A method for preparing a non-silicon modified polyester release film, characterized in that: The preparation method includes the steps of preparing a non-silicon modified release agent and coating the prepared non-silicon modified release agent on one side surface of a polyester film, wherein the step of preparing the non-silicon modified release agent includes: taking 70-80 parts by weight of a perfluoroalkyl acrylate copolymer and placing it in a stainless steel mixing tank; adding 10-20 parts by weight of hexafluoropropylene and stirring; adding 3-7 parts by weight of 2,2,3,3-tetrafluoropropanol and continuing to stir until a uniform and transparent solution is obtained; and adding 3-7 parts by weight of aluminum oxide nanoparticles and uniformly dispersing them in the solution.

5. The preparation method according to claim 4, wherein When preparing the non-silicone modified release agent, the humidity is controlled in an environment without moisture ingress, and the temperature is 20-25°C.

6. The preparation method according to claim 4, wherein The stirring speed of adding hexafluoropropylene is between 50-100 RPM and the stirring time is 30-40 minutes.

7. The preparation method according to claim 4, wherein The particle size of the added aluminum oxide nanoparticles is 10-50 nm, and the stirring speed of the aluminum oxide nanoparticles is 500-800 RPM for 60 minutes.

8. The preparation method according to claim 4, wherein The preparation method further comprises the steps of drying the coated non-silicon modified release agent and then heat-treating and curing it.

9. The preparation method according to claim 8, wherein The temperature during the drying is 80-100° C., and the time is 30-45 minutes.

10. The preparation method according to claim 8, characterized in that The temperature during the heat treatment curing is 150-180° C. and the time is 60-90 minutes.