Photocuring non-silicon release agent, heavy stripping release film and preparation method

Abstract

The invention discloses a light-cured non-silicon release agent, a heavy stripping release film and a preparation method. The light-cured non-silicon release agent is prepared from the following raw material components in parts by weight: 50 to 70 parts of long-chain polyacrylate containing double bonds, 5 to 10 parts of tris (2-hydroxyethyl) isocyanuric acid triacrylate, 1 to 5 parts of a photoinitiator, 1 to 3 parts of a de-foaming agent and 100 to 200 parts of a first solvent. According to the formula of the release agent, long-chain polyacrylate containing double bonds and tris (2-hydroxyethyl) isocyanuric acid triacrylate are compounded, so that the prepared release film has excellent performance: the residual adhesive force is greater than 90%, and the appearance is excellent; the release film provided by the invention is cured by adopting a low-temperature drying and photocuring process, so that the use of high-temperature and long-time curing processes can be avoided, the energy consumption can be obviously reduced, and the release film conforms to the environmental protection trend.

Description

Technical Field

[0001] This invention relates to the field of release materials, and particularly to a photocurable non-silicone release agent, a re-peeling release film, and a preparation method thereof. Background Technology

[0002] Release films, also known as anti-stick films, have wide applications in pressure-sensitive adhesives, construction, medical, and electronics industries. Typically, release is achieved by coating a PET substrate with fluorine, silicone oil, or a non-silicone release agent. Non-silicone release materials are primarily heavy-duty release agents, offering uniform and stable release force, consistent thickness, and good tensile strength and thermal stability. They are widely used in hot melt adhesives, micro-adhesives, and multilayer ceramic capacitors. With increasingly stringent environmental regulations, traditional thermosetting non-silicone release films are facing growing restrictions due to their high energy consumption. Photocuring is the future trend for non-silicone release films, replacing thermocuring.

[0003] Patent CN118725674A discloses a silicone-free re-release agent, its application, and its preparation method. In this method, lauryl methacrylate and hydroxyethyl acrylate are first made into a resin, and then an amino resin is used as a curing agent, p-toluenesulfonic acid is used as a catalyst, and toluene is used as a solvent. After curing at 130 °C for 2 min, a re-release film is obtained. The heat curing process requires a large amount of energy.

[0004] Patent CN118791925A discloses an environmentally friendly, low-VOC non-silicone release film with stable peeling effect, suitable for tape processing, and reduced aging creep rate and residual bonding rate. However, it still needs to be baked at 120 ℃ for 1 min, and its environmental protection properties need to be improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a release liner to address the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: In its first aspect, the present invention provides a photocurable non-silicone release agent, comprising the following raw material components in parts by weight: 50-70 parts of long-chain polyacrylate containing double bonds, 5-10 parts of tri(2-hydroxyethyl)isocyanurate triacrylate, 1-5 parts of photoinitiator, 1-3 parts of defoamer, and 100-200 parts of primary solvent.

[0007] Preferably, the first solvent is at least one of ethyl acetate and toluene.

[0008] Preferably, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add the second solvent to the reaction vessel, heat, and stir while purging with nitrogen. S2. Mix lauryl methacrylate, hydroxyethyl acrylate, initiator and second solvent evenly to obtain raw material solution. Drop the raw material solution into the reaction vessel. After the drop is complete, add the initiator and heat the reaction. S3. Maintain the current temperature, then add the initiator to react and obtain a polymer precursor without double bonds; S4. Cool to room temperature, introduce air, add polymerization inhibitor to polymer precursor, stir, then heat, add ethyl isocyanate acrylate, continue the reaction, cool after the reaction is complete to obtain long-chain polyacrylate containing double bonds.

[0009] Preferably, the second solvent is toluene and the initiator is AIBN.

[0010] Preferably, the polymerization inhibitor is p-hydroxyanisole.

[0011] Preferably, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add 150-600 g of toluene to the reaction vessel, heat to 60-80 °C, and stir with nitrogen gas for 15-60 min. S2. Mix 50-200 g lauryl methacrylate, 6-24 g hydroxyethyl acrylate, 0.5-2 g AIBN and 25-100 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 1-4 mL / min. After the addition is complete, add 0.1-0.4 g AIBN and heat to 80-100 ℃ to react for 0.5-2 hours. S3. Maintain at 80-100 °C, then add 0.05-0.2 g AIBN and react for 0.5-2 hours to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge with air for 15-60 min, add 0.01-0.04 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 5-20 min, then heat to 60-80℃, add 7.3-29.2 g of isocyanate ethyl acrylate, continue the reaction for 1.5-6 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

[0012] Preferably, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add 300 g of toluene to the reaction vessel, heat to 70 °C, and stir with nitrogen gas for 30 min. S2. Mix 100 g lauryl methacrylate, 12 g hydroxyethyl acrylate, 1 g AIBN and 50 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 2 mL / min. After the addition is complete, add 0.2 g AIBN and heat to 90 °C to react for 1 hour. S3. Maintain 90 °C, add 0.1 g AIBN, and react for 1 hour to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge air for half an hour, add 0.02 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 10 min, then heat to 70 °C, add 14.6 g of isocyanate ethyl acrylate, continue the reaction for 3 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

[0013] In a second aspect, the present invention provides a method for preparing the photocurable non-silicone release agent as described above. The method comprises: adding a long-chain polyacrylate containing double bonds, tri(2-hydroxyethyl) isocyanurate triacrylate, and an antifoaming agent to a solvent, stirring, then adding a photoinitiator, stirring evenly, and obtaining the photocurable non-silicone release agent.

[0014] A third aspect of the present invention provides a re-peeling release film, characterized in that it is prepared by the following method: adjusting the solid content of the photocurable non-silicone release agent as described above to 2.5-10% and uniformly coating it on a PET film, then curing it to obtain a re-peeling release film with a release layer thickness of 200-500 nm.

[0015] Preferably, the curing process is as follows: first, drying at 60-80 ℃ for 15-60 s, followed by UV curing, with the irradiation time controlled at 5-20 s and the irradiation energy at 300-1200 mJ / cm². 2 .

[0016] The beneficial effects of this invention are: This invention provides a photocurable non-silicone release agent, a heavy-release release film, and a preparation method thereof. The release agent formulation of this invention uses a compound of long-chain polyacrylate containing double bonds and tri(2-hydroxyethyl)isocyanurate triacrylate to give the prepared release film excellent performance: residual adhesion greater than 90% and excellent appearance. The release film provided by this invention is cured by a low-temperature drying and photocuring process, which can avoid the use of high-temperature and long-time curing processes, significantly reduce energy consumption, and conform to the trend of environmental protection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sampling location of the spline in the acquisition of release film related data. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.

[0019] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0020] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials and reagents used in the following examples are commercially available. For examples where specific conditions are not specified, conventional conditions or conditions recommended by the manufacturer are followed. For reagents or instruments whose manufacturers are not specified, they are all commercially available products.

[0021] This invention provides a photocurable non-silicone release agent, comprising the following raw material components in parts by weight: 50-70 parts of long-chain polyacrylate containing double bonds, 5-10 parts of tri(2-hydroxyethyl)isocyanurate triacrylate, 1-5 parts of photoinitiator, 1-3 parts of defoamer, and 100-200 parts of primary solvent.

[0022] In a preferred embodiment, the first solvent is at least one of ethyl acetate and toluene.

[0023] In a preferred embodiment, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add the second solvent to the reaction vessel, heat, and stir while purging with nitrogen. S2. Mix lauryl methacrylate, hydroxyethyl acrylate, initiator and second solvent evenly to obtain raw material solution. Drop the raw material solution into the reaction vessel. After the drop is complete, add the initiator and heat the reaction. S3. Maintain the current temperature, then add the initiator to react and obtain a polymer precursor without double bonds; S4. Cool to room temperature, introduce air, add polymerization inhibitor to polymer precursor, stir, then heat, add ethyl isocyanate acrylate, continue the reaction, cool after the reaction is complete to obtain long-chain polyacrylate containing double bonds.

[0024] In a preferred embodiment, the second solvent is toluene and the initiator is AIBN.

[0025] In a preferred embodiment, the polymerization inhibitor is p-hydroxyanisole.

[0026] In a preferred embodiment, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add 150-600 g of toluene to the reaction vessel, heat to 60-80 °C, and stir with nitrogen gas for 15-60 min. S2. Mix 50-200 g lauryl methacrylate, 6-24 g hydroxyethyl acrylate, 0.5-2 g AIBN and 25-100 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 1-4 mL / min. After the addition is complete, add 0.1-0.4 g AIBN and heat to 80-100 ℃ to react for 0.5-2 hours. S3. Maintain at 80-100 °C, then add 0.05-0.2 g AIBN and react for 0.5-2 hours to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge with air for 15-60 min, add 0.01-0.04 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 5-20 min, then heat to 60-80 ℃, add 7.3-29.2 g of isocyanate ethyl acrylate, continue the reaction for 1.5-6 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

[0027] In a preferred embodiment, the long-chain polyacrylate containing double bonds is prepared by the following steps: S1. Add 300 g of toluene to the reaction vessel, heat to 70 °C, and stir with nitrogen gas for 30 min. S2. Mix 100 g lauryl methacrylate, 12 g hydroxyethyl acrylate, 1 g AIBN and 50 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 2 mL / min. After the addition is complete, add 0.2 g AIBN and heat to 90 °C to react for 1 hour. S3. Maintain 90 °C, add 0.1 g AIBN, and react for 1 hour to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge air for half an hour, add 0.02 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 10 min, then heat to 70 °C, add 14.6 g of isocyanate ethyl acrylate, continue the reaction for 3 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

[0028] The present invention also provides a method for preparing the above-mentioned photocurable non-silicone release agent, the method comprising: adding a long-chain polyacrylate containing double bonds, tri(2-hydroxyethyl) isocyanurate triacrylate, and an antifoaming agent to a solvent, stirring, then adding a photoinitiator, stirring evenly, and obtaining a photocurable non-silicone release agent.

[0029] The present invention also provides a heavy-release release film, which is prepared by the following method: the solid content of the above-mentioned photocurable non-silicone release agent is adjusted to 2.5-10% and then uniformly coated on a PET (polyethylene terephthalate) film, and cured to obtain a heavy-release release film with a release layer thickness of 200-500 nm.

[0030] In a preferred embodiment, the curing process is as follows: first, drying at 60-80 °C for 15-60 s, followed by UV curing, with the irradiation time controlled at 5-20 s and the irradiation energy at 300-1200 mJ / cm². 2 .

[0031] The main mechanism of this invention is that long-chain polyacrylates have a large number of low-polarity methyl groups on their chain segments, which gives them low surface tension and can provide good release effect. Tri(2-hydroxyethyl)isocyanurate triacrylate has good reactivity. When combined with long-chain acrylates, it can form a stable release layer structure, which can fully cover the release base film, thereby obtaining a release film with stable isolation effect.

[0032] A unique "rigid-flexible" photocurable network was constructed through the synergistic effect of long-chain polyacrylate containing double bonds and tri(2-hydroxyethyl)isocyanurate triacrylate. The highly cross-linked rigid network formed by the trifunctionality of tri(2-hydroxyethyl)isocyanurate triacrylate provides structural support for the release layer, while the long-chain polyacrylate, through its long-chain flexible backbone and polymerizable double bonds, endows the system with excellent flexibility and chain segment mobility, achieving a good release effect.

[0033] The synergistic effect of the two has brought about a breakthrough in technological progress: the flexible segments not only enhance the mobility of the network and achieve a good balance between release force and structural stability, but also enable high-speed reaction and curing under UV conditions due to the vinyl activity, preventing the release film from deforming due to heat. Through the synergy of the above unique bulk properties and surface behavior, the technical bottlenecks of traditional non-silicone release agents in terms of performance regulation and process adaptability have been successfully overcome, achieving a perfect unity of high performance and low energy consumption.

[0034] The above is the general concept of the present invention. Based on this, detailed embodiments and comparative examples are provided below to further illustrate the present invention.

[0035] Preparation Example The synthesis method of long-chain polyacrylates containing double bonds involved in the following examples is as follows: S1. Accurately weigh 300 g of toluene and place it in a 1 L four-necked flask equipped with a metal stirrer, a serpentine condenser and a gas delivery tube. Introduce high-purity nitrogen gas through the gas delivery tube and stir at 70°C and 100 rpm for 30 minutes.

[0036] S2. Weigh 100 g lauryl methacrylate, 12 g hydroxyethyl acrylate, 1 g AIBN and 50 g toluene and mix them evenly to obtain a raw material solution. Use a peristaltic pump to drop the raw material solution into a four-necked flask at a rate of 2 mL / min to start the free radical polymerization reaction. After the addition is complete, add 0.2 g initiator and heat to 90 °C to react for 1 hour.

[0037] S3. Maintain 90 °C, add 0.1 g AIBN and react for 1 hour to obtain a polymer precursor without double bonds.

[0038] S4. Cool to room temperature, purge with air for half an hour, add 0.02 g of polymerization inhibitor MEHQ, stir for 10 min, then heat to 70 ℃ and add 14.6 g of ethyl isocyanate acrylate (AOI). Continue the reaction for 3 hours, and after cooling to room temperature, a long-chain polyacrylate containing double bonds is obtained with a weight-average molecular weight between 2-4 w and a molecular weight distribution between 3-4 w. The polymer solid content is about 28%.

[0039] Example 1 A photocurable non-silicone release agent is prepared by the following method: Accurately weigh 70 g of long-chain acrylate containing double bonds, 3 g of tri(2-hydroxyethyl)isocyanurate triacrylate, 0.6 g of photoinitiator 184 and 327 g of toluene, mix them evenly, then add 1 g of defoamer BYK-057, stir and disperse for 30 min to obtain a photocurable non-silicone release agent.

[0040] A re-peeling release film is prepared by the following method: a photocurable non-silicone release agent is coated onto a 30 μm thick PET film using a wire rod, resulting in a coating thickness of 300 nm. The film is then dried in a 70 °C hot air circulating oven for 30 seconds to remove residual agent, followed by UV curing with an energy of 600 mJ / cm². 2 The vehicle speed was 10 m / min and the light exposure time was 10 s, resulting in a re-peeling release film.

[0041] Example 2 A photocurable non-silicone release agent is prepared by the following method: Accurately weigh 70 g of long-chain acrylate containing double bonds, 4 g of tri(2-hydroxyethyl)isocyanurate triacrylate, 0.6 g of photoinitiator 184 and 326 g of toluene, mix them evenly, then add 1 g of defoamer BYK-057, stir and disperse for 30 min to obtain a photocurable non-silicone release agent.

[0042] A re-peeling release film is prepared by the following method: a photocurable non-silicone release agent is coated onto a 30 μm thick PET film using a wire rod, resulting in a coating thickness of 300 nm. The film is then dried in a 70 °C hot air circulating oven for 30 seconds to remove residual agent, followed by UV curing with an energy of 600 mJ / cm². 2 The vehicle speed was 10 m / min and the light exposure time was 10 s, resulting in a re-peeling release film.

[0043] Example 3 A photocurable non-silicone release agent is prepared by the following method: Accurately weigh 70 g of long-chain acrylate containing double bonds, 5 g of tri(2-hydroxyethyl)isocyanurate triacrylate, 0.6 g of photoinitiator 184 and 325 g of toluene, mix them evenly, then add 1 g of defoamer BYK-057, stir and disperse for 30 min to obtain a photocurable non-silicone release agent.

[0044] A re-peeling release film is prepared by the following method: a photocurable non-silicone release agent is coated onto a 30 μm thick PET film using a wire rod, resulting in a coating thickness of 300 nm. The film is then dried in a 70 °C hot air circulating oven for 30 seconds to remove residual agent, followed by UV curing with an energy of 600 mJ / cm². 2 The vehicle speed was 10 m / min and the light exposure time was 10 s, resulting in a re-peeling release film.

[0045] Example 4 A photocurable non-silicone release agent is prepared by the following method: Accurately weigh 70 g of long-chain acrylate containing double bonds, 6 g of tri(2-hydroxyethyl)isocyanurate triacrylate, 0.6 g of photoinitiator 184 and 324 g of toluene, mix them evenly, then add 1 g of defoamer BYK-057, stir and disperse for 30 min to obtain a photocurable non-silicone release agent.

[0046] A re-peeling release film is prepared by the following method: a photocurable non-silicone release agent is coated onto a 30 μm thick PET film using a wire rod, resulting in a coating thickness of 300 nm. The film is then dried in a 70 °C hot air circulating oven for 30 seconds to remove residual agent, followed by UV curing with an energy of 600 mJ / cm². 2 The vehicle speed was 10 m / min and the light exposure time was 10 s, resulting in a re-peeling release film.

[0047] Comparative Example 1 A release agent, which is prepared by the following method: Accurately weigh 70 g of a polymer precursor without double bonds (obtained through the above preparation example), 10 g of melamine resin, and 0.2 g of p-toluenesulfonic acid, mix them evenly, dilute with toluene to a solid content of 5%, and stir and disperse for 30 min to obtain a release agent.

[0048] A release film for repeated peeling is prepared by the following method: a release agent is coated onto a PET film with a thickness of 30 μm using a wire rod, and the coating thickness is 300 nm. The film is then baked in an oven at 120 °C for 1 min to obtain the PET release film.

[0049] Comparative Example 2 A release agent, which is prepared by the following method: Accurately weigh 70 g of a polymer precursor without double bonds (obtained through the above preparation example), 15 g of melamine resin, and 0.2 g of p-toluenesulfonic acid, mix them evenly, dilute with toluene to a solid content of 5%, and stir and disperse for 30 min to obtain a release agent.

[0050] A release film for repeated peeling is prepared by the following method: a release agent is coated onto a PET film with a thickness of 30 μm using a wire rod, and the coating thickness is 300 nm. The film is then baked in an oven at 120 °C for 1 min to obtain the PET release film.

[0051] The following performance tests were performed on the products prepared in the examples and comparative examples: 1. Data acquisition related to release film: Take a release coating material (film / paper) with a size of at least 450 mm long and 250 mm wide. Use your finger to gently press one end of the standard test tape onto the release substrate in the direction of the machine's release coating (or you can use a face material of appropriate size coated with standard pressure-sensitive adhesive to replace the standard test tape and press it onto the release substrate). The standard pressure roller applies the standard test tape 31B to the release material being tested at a speed of 10 mm / s, and rolls it for 2 rounds. Cut test strips according to the standard test tape dimensions. The test strips should be 125-175 mm long and 25 mm wide. The cuts should be clean and straight. A sample requires at least three splines from the left (A), center (B), and right (C) positions (e.g., Figure 1 ).

[0052] 2. 20 min and 24 h tests: Place the release film at room temperature (23±2℃, relative humidity 50%) for 20 min and 24 h, and then use a universal tensile testing machine to peel it at 300 mm / min at 180°. Test 3 times and take the average value as the release force at 20 min and 24 h.

[0053] 3. Residual Adhesion Rate Test: Apply standard adhesive tape (Nitto 31B, 25 mm width) to a release film (release paper) sample, roll it back and forth three times with a 2 kg standard pressure roller, then age it for 20 hours at 70℃ and under the pressure of a 2 kg standard weight. Next, cool it at room temperature (23±2℃, 50% relative humidity) for 0.5-2 hours, and then peel it 180° at a speed of 300 mm / min using a peel strength tester. Each sample should contain at least three tapes. Apply the peeled standard tape to a standard stainless steel plate, place it under 2000 g pressure at room temperature (23±2℃, 50% relative humidity) for 2 hours, and then peel it 180° at a speed of 300 mm / min. Obtain the test value L1 and take the average value. Apply the standard tape to a blank sample (standard stainless steel plate), roll it back and forth three times with a 2 kg standard pressure roller, and then age it at 70℃ and under the pressure of a 2 kg standard weight for 20 hours. Place the sample at ℃ (50% relative humidity) for 2 hours, then peel it at 300 mm / min at 180°; record the value L0; similarly, each group of samples should have no less than 3 samples, and take the average value; calculate the value L1 ÷ L0 × 100%, which is the residual adhesion rate.

[0054] 4. Appearance Inspection Standards: Backlight and surface inspection are conducted under a standard incandescent lamp light source (visible light band 400-700 nm). White dots / pinpoints are detected using a dot gauge. A white dot / pinpoint size of 0.1 mm-0.3 mm, with a quantity ≤10 per square meter and no rainbow pattern, is considered excellent. A white dot / pinpoint size of 0.3 mm-0.5 mm, with a quantity ≤10 per square meter, and no or uniform rainbow pattern, is considered acceptable.

[0055] The test results are shown in Table 1 below: Table 1 Comparative test data shows that the release films in Examples 1-4 exhibit excellent appearance, with residual adhesion of no less than 90%, and peel strength at 20 min and 24 h can be achieved using trifunctional acrylates. This is attributed to the fact that this invention, by synthesizing acrylates containing double bonds, avoids the use of high temperatures and long curing times during the release film curing process. The resulting release film product possesses strong peel resistance to adhesive tapes and characteristics comparable to traditional thermosetting release films.

[0056] Further analysis of Examples 1-4 revealed that long-chain acrylates containing double bonds were used as low-polarity base adhesives, and tri(2-hydroxyethyl)isocyanurate triacrylate was used as a high-polarity crosslinking agent. In Examples 1-3, the base adhesive and crosslinking agent reacted. As the crosslinking agent was gradually increased, the polarity of the prepared photocurable non-silicone release agent gradually decreased, and the peel strength decreased accordingly. In Examples 1 and 2, the base adhesive had redundancy until the reaction was complete in Example 3, at which point the system polarity decreased to its extreme value, resulting in the lowest peel strength. However, with the increase of the crosslinking agent, redundancy occurred, and the system polarity increased. Furthermore, the system polarity was greater than that of Example 1, resulting in the highest peel strength in Example 4. However, as the amount of crosslinking agent gradually increased, the high system polarity led to high hygroscopicity of the release layer, reducing its surface energy.

[0057] Due to differences in their formulations, Comparative Examples 1 and 2 require cross-linking and curing of the hydroxyl and amino resins at 120 °C for 1 min under the catalysis of p-toluenesulfonic acid. The performance of Comparative Examples 1 and 2 is significantly reduced because they lack double bonds.

[0058] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details.

Claims

1. A photocurable non-silicone release agent, characterized in that, Includes the following raw material components by weight: 50-70 parts of long-chain polyacrylate containing double bonds, 5-10 parts of tri(2-hydroxyethyl)isocyanurate triacrylate, 1-5 parts of photoinitiator, 1-3 parts of defoamer, and 100-200 parts of primary solvent.

2. The photocurable non-silicone release agent according to claim 1, characterized in that, The first solvent is at least one of ethyl acetate and toluene.

3. The photocurable non-silicone release agent according to claim 1, characterized in that, Long-chain polyacrylates containing double bonds are prepared by the following steps: S1. Add the second solvent to the reaction vessel, heat, and stir while purging with nitrogen. S2. Mix lauryl methacrylate, hydroxyethyl acrylate, initiator and second solvent evenly to obtain raw material solution. Drop the raw material solution into the reaction vessel. After the drop is complete, add the initiator and heat the reaction. S3. Maintain the current temperature, then add the initiator to react and obtain a polymer precursor without double bonds; S4. Cool to room temperature, introduce air, add polymerization inhibitor to polymer precursor, stir, then heat, add ethyl isocyanate acrylate, continue the reaction, cool after the reaction is complete to obtain long-chain polyacrylate containing double bonds.

4. The photocurable non-silicone release agent according to claim 3, characterized in that, The second solvent is toluene, and the initiator is AIBN.

5. The photocurable non-silicone release agent according to claim 4, characterized in that, The polymerization inhibitor is p-hydroxyanisole.

6. The photocurable non-silicone release agent according to claim 5, characterized in that, Long-chain polyacrylates containing double bonds are prepared by the following steps: S1. Add 150-600 g of toluene to the reaction vessel, heat to 60-80 °C, and stir with nitrogen gas for 15-60 min. S2. Mix 50-200 g lauryl methacrylate, 6-24 g hydroxyethyl acrylate, 0.5-2 g AIBN and 25-100 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 1-4 mL / min. After the addition is complete, add 0.1-0.4 g AIBN and heat to 80-100 ℃ to react for 0.5-2 hours. S3. Maintain at 80-100 °C, then add 0.05-0.2 g AIBN and react for 0.5-2 hours to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge with air for 15-60 min, add 0.01-0.04 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 5-20 min, then heat to 60-80 ℃, add 7.3-29.2 g of isocyanate ethyl acrylate, continue the reaction for 1.5-6 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

7. The photocurable non-silicone release agent according to claim 6, characterized in that, Long-chain polyacrylates containing double bonds are prepared by the following steps: S1. Add 300 g of toluene to the reaction vessel, heat to 70 °C, and stir with nitrogen gas for 30 min. S2. Mix 100 g lauryl methacrylate, 12 g hydroxyethyl acrylate, 1 g AIBN and 50 g toluene evenly to obtain a raw material solution. Add the raw material solution dropwise into the reaction vessel at a rate of 2 mL / min. After the addition is complete, add 0.2 g AIBN and heat to 90 °C to react for 1 hour. S3. Maintain 90 °C, add 0.1 g AIBN, and react for 1 hour to obtain a polymer precursor without double bonds; S4. Cool to room temperature, purge air for half an hour, add 0.02 g of polymerization inhibitor p-hydroxyanisole to the polymer precursor, stir for 10 min, then heat to 70 °C, add 14.6 g of isocyanate ethyl acrylate, continue the reaction for 3 hours, and cool to room temperature to obtain long-chain polyacrylate containing double bonds.

8. A method for preparing a photocurable non-silicone release agent as described in any one of claims 1-7, characterized in that, The method is as follows: long-chain polyacrylate containing double bonds, tri(2-hydroxyethyl) isocyanurate triacrylate, and defoamer are added to a solvent and stirred. Then, a photoinitiator is added and stirred evenly to obtain the photocurable non-silicone release agent.

9. A re-peeling release film, characterized in that, It is prepared by the following method: the solid content of the photocurable non-silicone release agent as described in any one of claims 1-7 is adjusted to 2.5-10% and then uniformly coated on a PET film, and cured to obtain a release film with a release layer thickness of 200-500 nm.

10. The re-peeling release film according to claim 9, characterized in that, in, The curing process is as follows: first, dry at 60-80℃ for 15-60 seconds, then cure by UV light, controlling the light exposure time to be 5-20 seconds and the light energy to be 300-1200 mJ / cm². 2 .

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