Bio-based UV curing release agent, preparation method thereof and release film

Abstract

The invention discloses a bio-based UV curing release agent, a preparation method thereof and a release film. The release agent comprises the following raw material components in parts by weight: 50-100 parts of acrylate-terminated modified silicone oil; 0.1 to 50 parts of terminal hydrogen-containing silicone oil; 10 to 20 parts of methacrylic acid malate light-cured resin; 0.1 to 0.5 part of pentaerythritol acrylate; and 1-5 parts of a photoinitiator. According to the invention, the methacrylate malate light-cured resin which can be subjected to cross-linking reaction with the organic silicon resin is selected, so that the defect of low residue after most bio-based organic matters are cross-linked with the resin is fundamentally overcome. Due to the increase of DL-malic acid, the content of methacrylic acid introduced into the resin is increased, the content of terminal olefin in a system is increased, double bonds participating in curing under ultraviolet light are increased, the crosslinking density of the system is increased, the performance of the resin is better, and the use in various environments is facilitated.

Description

Technical Field

[0001] The invention relates to the field of release materials, and in particular to a bio-based UV curing release agent, a preparation method thereof and a release film. Background Art

[0002] As a functional film material, release film is a film that is coated on the surface of PET, PE and other films, so that it can separate and isolate various organic pressure-sensitive adhesives. Release coating is the main functional coating that has the effect of separation and isolation, and plays a key role in the overall release film. Through the isolation and protection of various adhesive materials, the adhesive layer can be attached or coated on the release film, and finally the adhesive layer + release film product is made, and the release film can be stably peeled off when used at the terminal. Therefore, release film can be widely used in packaging, printing and coating, electronics, medical, waterproof materials, die-cutting and punching processing and other industries.

[0003] Release agent is an important raw material for making release film. It can be divided into silicone solvent-free type, silicone solvent type, non-silicone type, fluorine type, water-based type, light-curing type, etc. At present, the release film types on the market are mainly thermosetting. Most of the thermosetting release films need to be diluted with organic solvents during the process. In this way, a large amount of VOC (volatile organic compounds) gas will be volatilized after passing through the oven during the process. The volatile VOC gas not only causes irreversible damage to the health of production personnel, but also seriously pollutes the environment. At the same time, enterprises also have to spend huge costs to deal with the volatile VOC gas. With the increasingly stringent environmental protection standards of government departments, UV-curable release agents have become an indispensable product in the market. UV-curable release agents do not require solvent dilution, are green and environmentally friendly, not only do they not volatilize VOC gas during the process, but also completely avoid the defects of flammable and explosive in the production process of solvent-based release films, greatly increasing the safety of the production process.

[0004] Since the release film of the process biodegrades slowly, it cannot be directly discarded or landfilled after use and must be treated as solid waste, which is costly. Therefore, the development of environmentally friendly and degradable release films has become an urgent need. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a bio-based UV curing release agent, a preparation method thereof and a release film in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect of the present invention, a bio-based UV curable release agent is provided, comprising the following raw material components in parts by weight:

[0007] 50-100 parts of terminal acrylate modified silicone oil;

[0008] 0.1-50 parts of end-containing hydrogen silicone oil;

[0009] 10-20 parts of methacrylate malate photocurable resin;

[0010] Pentaerythritol acrylate 0.1-0.5 parts;

[0011] Photoinitiator 1-5 parts.

[0012] Preferably, the methacrylate malate photocurable resin is prepared by the following method:

[0013] S1, phthalic anhydride, neopentyl glycol, diethylene glycol, maleic anhydride and DL-malic acid are mixed, then a catalyst is added, heated, nitrogen is introduced, stirred for reaction, then the temperature is raised, stirring for reaction is continued, during which the acid value of the product is continuously monitored, and the reaction is stopped when the acid value no longer changes;

[0014] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring, heating, and then adding an inhibitor and an antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly and then heating to react, monitoring the acid value of the product, and stopping the reaction when the acid value no longer changes, thereby obtaining a methacrylate malate photocurable resin.

[0015] Preferably, the catalyst is methanesulfonic acid, the inhibitor is inhibitor 701, and the antioxidant is antioxidant 1790.

[0016] Preferably, the methacrylate malate photocurable resin is prepared by the following method:

[0017] S1. Mix 44-176 parts of phthalic anhydride, 30-120 parts of neopentyl glycol, 38-152 parts of diethylene glycol, 12-48 parts of maleic anhydride and 25-100 parts of DL-malic acid by weight, then add 0.5% of the mass of all raw materials of methanesulfonic acid as a catalyst, heat to 120-135° C., introduce nitrogen, stir and react at a speed of 150-600 r / min for 0.5-2h, then heat to 138-150° C., continue to stir and react, and continuously measure the acid value of the product during the reaction, and stop the reaction when the acid value no longer changes;

[0018] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 150-600r / min, heating to 70-90°C, and then adding 0.05-0.2% of inhibitor 701 and 0.5-2% of antioxidant 1790 accounting for the total mass of the reactants, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 100-120°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

[0019] Preferably, the methacrylate malate photocurable resin is prepared by the following method:

[0020] S1. By weight, 88 parts of phthalic anhydride, 60 parts of neopentyl glycol, 76 parts of diethylene glycol, 24 parts of maleic anhydride and 49.23 parts of DL-malic acid were mixed, and then 0.5% of the mass of all raw materials of methanesulfonic acid was added as a catalyst, heated to 130°C, nitrogen was introduced, and stirred at a speed of 300r / min for 1h, and then the temperature was raised to 140°C, and the stirring reaction was continued. During this period, the acid value of the product was continuously measured, and the reaction was stopped when the acid value no longer changed;

[0021] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 300r / min, heating to 80°C, and then adding 0.1% of the total mass of the inhibitor and 1% of the antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 110°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

[0022] Preferably, the molecular weight of the hydrogen-terminated silicone oil is 15000-45000 g / mol, and the mass ratio of the acrylate-modified silicone oil, the hydrogen-terminated silicone oil and the methacrylate malate photocurable resin is 1:1:0.1-1:4:1.

[0023] Preferably, the mass ratio of pentaerythritol acrylate to terminal hydrogen-containing silicone oil is 0.5:1 to 5:1.

[0024] Preferably, the pentaerythritol acrylate is one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate and pentaerythritol hexaacrylate.

[0025] The second aspect of the present invention provides a method for preparing the bio-based UV curing release agent as described above, comprising the following steps: uniformly mixing terminal acrylate modified silicone oil, terminal hydrogen silicone oil, methacrylate malate photocurable resin, pentaerythritol acrylate, and a photoinitiator to obtain the bio-based UV curing release agent.

[0026] The third aspect of the present invention provides a bio-based UV curable release film, which is prepared by the following method: the bio-based UV curable release agent as described above is evenly coated on a substrate, and cured by UV irradiation to obtain the bio-based UV curable release film.

[0027] The beneficial effects of the present invention are:

[0028] The present invention provides a bio-based UV curing release agent and release film. The present invention uses a methacrylate malate photocurable resin that can react with a silicone resin to fundamentally solve the shortcoming that most bio-based organic matter has low residual after cross-linking with the resin. DL-malic acid, as a dibasic acid containing free hydroxyl groups, can be used to synthesize a resin containing free hydroxyl groups in the side chain, and methacrylic acid is grafted on the side chain of the resin through an esterification reaction. Compared with the double bond of maleic anhydride on the main chain of the resin, the double bond of the side chain has higher activity. The increase of DL-malic acid increases the content of methacrylic acid introduced into the resin, increases the content of terminal olefins in the system, increases the double bonds participating in curing under ultraviolet light, increases the cross-linking density of the system, and thus the performance of the resin becomes better, which is conducive to use in various environments.

[0029] The present invention prepares a UV release agent that does not require solvent dilution, greatly reduces the volatilization of VOC gas during the manufacturing process, and the methacrylate malate photocurable resin can be degraded in the natural environment, which is green and environmentally friendly.

[0030] The release film prepared by the present invention has the characteristics of low release force and low climbing, and high residual adhesion, which greatly improves the risk of silicon element transfer to various adhesive surfaces and better guarantees the back-end application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The schematic diagram is a preparation route of the methacrylate malate photocurable resin of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0033] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0034] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0035] The present invention provides a bio-based UV curing release agent, comprising the following raw material components in parts by weight:

[0036]

[0037]

[0038] In a preferred embodiment, the methacrylate malate photocurable resin is prepared by the following method:

[0039] S1, phthalic anhydride, neopentyl glycol, diethylene glycol, maleic anhydride and DL-malic acid are mixed, then a catalyst is added, heated, nitrogen is introduced, stirred for reaction, then the temperature is raised, stirring for reaction is continued, during which the acid value of the product is continuously monitored, and the reaction is stopped when the acid value no longer changes;

[0040] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring, heating, and then adding an inhibitor and an antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly and then heating to react, monitoring the acid value of the product, and stopping the reaction when the acid value no longer changes, thereby obtaining a methacrylate malate photocurable resin.

[0041] In a preferred embodiment, the catalyst is methanesulfonic acid, the inhibitor is inhibitor 701, and the antioxidant is antioxidant 1790.

[0042] The preparation route of methacrylate malate photocurable resin is as follows: Figure 1 ,in:

[0043] R1 means R2 means

[0044] The present invention uses methacrylate malate photocurable resin that can crosslink with silicone resin, which fundamentally solves the problem that most bio-based organic matter has low residual after crosslinking with resin. DL-malic acid, as a dibasic acid containing free hydroxyl groups, can be synthesized as Figure 1The resin shown contains free hydroxyl groups in the side chains, and methacrylic acid is grafted onto the side chains of the resin through an esterification reaction. Compared with the double bonds of maleic anhydride on the main chain of the resin, the double bonds of the side chains have higher activity. The increase of DL-malic acid increases the content of methacrylic acid introduced into the resin, increases the content of terminal olefins in the system, increases the double bonds participating in curing under ultraviolet light, and increases the crosslinking density of the system. As a result, the performance of the resin becomes better, which is conducive to use in a variety of environments.

[0045] In a preferred embodiment, the methacrylate malate photocurable resin is prepared by the following method:

[0046] S1. Mix 44-176 parts of phthalic anhydride, 30-120 parts of neopentyl glycol, 38-152 parts of diethylene glycol, 12-48 parts of maleic anhydride and 25-100 parts of DL-malic acid by weight, then add 0.5% of the mass of all raw materials of methanesulfonic acid as a catalyst, heat to 120-135° C., introduce nitrogen, stir and react at a speed of 150-600 r / min for 0.5-2h, then heat to 138-150° C., continue to stir and react, and continuously measure the acid value of the product during the reaction, and stop the reaction when the acid value no longer changes;

[0047] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 150-600r / min, heating to 70-90°C, and then adding 0.05-0.2% of inhibitor 701 and 0.5-2% of antioxidant 1790 accounting for the total mass of the reactants, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 100-120°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

[0048] In a preferred embodiment, the methacrylate malate photocurable resin is prepared by the following method:

[0049] S1. By weight, 88 parts of phthalic anhydride, 60 parts of neopentyl glycol, 76 parts of diethylene glycol, 24 parts of maleic anhydride and 49.23 parts of DL-malic acid were mixed, and then 0.5% of the mass of all raw materials of methanesulfonic acid was added as a catalyst, heated to 130°C, nitrogen was introduced, and stirred at a speed of 300r / min for 1h, and then the temperature was raised to 140°C, and the stirring reaction was continued. During this period, the acid value of the product was continuously measured, and the reaction was stopped when the acid value no longer changed;

[0050] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 300r / min, heating to 80°C, and then adding 0.1% of the total mass of the inhibitor and 1% of the antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 110°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

[0051] In a preferred embodiment, the molecular weight of the hydrogen-terminated silicone oil is 15000-45000 g / mol, and the mass ratio of the acrylate-modified silicone oil, the hydrogen-terminated silicone oil and the methacrylate malate photocurable resin is 1:1:0.1-1:4:1.

[0052] In a preferred embodiment, the mass ratio of pentaerythritol acrylate to terminal hydrogen-containing silicone oil is 0.5:1 to 5:1.

[0053] In a preferred embodiment, the pentaerythritol acrylate is one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate, and pentaerythritol hexaacrylate.

[0054] The present invention also provides a method for preparing the above bio-based UV curing release agent, comprising the following steps: uniformly mixing terminal acrylate modified silicone oil, terminal hydrogen silicone oil, methacrylate malate photocurable resin, pentaerythritol acrylate, and a photoinitiator to obtain a bio-based UV curing release agent.

[0055] The present invention also provides a bio-based UV curable release film, which is prepared by the following method: uniformly coating the above bio-based UV curable release agent on a substrate, and curing by UV irradiation to obtain the bio-based UV curable release film.

[0056] In a preferred embodiment, the thickness of the substrate layer is 50-100 μm; the coating amount of the release agent is 0.2-1.5 g / m 2 The release agent of the present invention has a small coating amount and can greatly improve the light transmittance and haze of the release film.

[0057] In a preferred embodiment, the substrate layer is any one of PP, PET, and PE films.

[0058] The present invention utilizes methacrylate malate that can cross-link with silicone resin to improve the residual adhesion of the release coating. The release agent prepared by the present invention has the characteristics of low release force and low climbing. The release coating prepared by the present invention has high residual adhesion, which greatly improves the risk of silicon element transfer to various adhesive surfaces and better guarantees the back-end application. The present invention does not require solvent dilution, greatly reduces the volatilization of VOC gas during the process, and methacrylate malate can be degraded in the natural environment, which is green and environmentally friendly.

[0059] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0060] The sources of the main raw materials in the following examples and comparative examples are shown in Table 1 below:

[0061] Table 1

[0062]

[0063]

[0064] The methacrylate malate photocurable resins involved in the following examples and comparative examples are all prepared by the following method:

[0065] S1. By weight, 88 parts of phthalic anhydride, 60 parts of neopentyl glycol, 76 parts of diethylene glycol, 24 parts of maleic anhydride and 49.23 parts of DL-malic acid are mixed, and then 0.5% of the mass of all raw materials (i.e., phthalic anhydride, neopentyl glycol, diethylene glycol, maleic anhydride and DL-malic acid) of methylsulfonic acid is added as a catalyst, heated to 130° C., nitrogen is introduced, and the reaction is stirred at a speed of 300 r / min for 1 hour, then the temperature is raised to 140° C., and the reaction is continued to be stirred for about 7 hours, during which the acid value of the product is continuously measured, and the reaction is stopped when the acid value no longer changes;

[0066] S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 300r / min, heating to 80°C, and then adding 0.1% of inhibitor 701 and 1% of antioxidant 1790 accounting for the total mass of the reactants, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 110°C, reacting for 1h, and starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes (reacting for about 7h), methacrylate malate photocurable resin.

[0067] The methacrylate malate photocurable resins prepared in the above examples and comparative examples were respectively prepared into bio-based UV-curable release films according to the following methods:

[0068] 1) Evenly mix terminal acrylate modified silicone oil, terminal hydrogen silicone oil, methacrylate malate photocurable resin, pentaerythritol acrylate and photoinitiator to obtain a bio-based UV curable release agent.

[0069] 2) The above bio-based UV curing release agent is evenly coated on a 50μm PET substrate, 8 nitrogen oxygen content is less than 5PPM, and a UV lamp with a wavelength of 200-280nm and 100mj / cm 2 , 3 seconds to obtain a bio-based UV-curing release film.

[0070] The formulations of the bio-based UV curable release agents in the embodiments and comparative examples are shown in Table 2 below:

[0071] Table 2

[0072]

[0073]

[0074] The release films prepared in the examples and comparative examples were subjected to the following performance tests:

[0075] Release force is tested by using tesa 7475 test tape to bond the release surface of the release film, leaving it at room temperature for 20 minutes (or 24 hours), and then peeling it off at an angle of 180° at a peeling speed of 300mm / min.

[0076] 70℃×20h aging release force test: After the tesa 7475 test tape is attached to the release surface of the release film, it is aged at 70℃ for 20h. The tensile force is measured when peeling at an angle of 180° and a peeling speed of 300mm / min.

[0077] In the test of the residual adhesion rate after aging at 70℃×20h, the Nitto 31B test tape was bonded to the release surface of the release film, aged at 70℃ for 20h, peeled off, and the adhesion value of the Nitto 31B test tape after peeling was tested as D; the adhesion value of the Nitto 31B test tape after not bonding to the release surface of the release film was tested as C; the residual adhesion rate after aging at 70℃×20h was calculated, and the residual adhesion rate after aging at 70℃×20h=D / C×100%.

[0078] The test results are shown in Table 3 below:

[0079] Table 3

[0080]

[0081]

[0082] According to the test results in Table 3, it can be seen that Examples 1 to 3 have excellent comprehensive performance, and it can be seen that as the addition ratio of malate methacrylate increases, the peel force gradually decreases and the aging performance of the release force becomes more stable;

[0083] By comparing Example 2 with Comparative Example 3, the higher the malate methacrylate content, the easier it is to affect the residue of the release film, but the higher the malate methacrylate content, the lower the release force of the release film.

[0084] By comparing Example 1 with Comparative Example 6, the residual value after adding an appropriate proportion of the bio-based additive malic methacrylate of the present invention is significantly higher than that of most commercially available release agents, which is mainly attributed to the bonding reaction of the vinyl contained in pentaerythritol acrylate during UV curing, and can be better anchored with the main structure of the release agent and malic methacrylate;

[0085] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A bio-based UV curable release agent, characterized in that: The invention comprises the following raw material components by weight: 50-100 parts of terminal acrylate modified silicone oil; 0.1-50 parts of end-containing hydrogen silicone oil; 10-20 parts of methacrylate malate photocurable resin; Pentaerythritol acrylate 0.1-0.5 parts; Photoinitiator 1-5 parts.

2. The bio-based UV curable release agent according to claim 1, characterized in that: The methacrylate malate photocurable resin is prepared by the following method: S1, phthalic anhydride, neopentyl glycol, diethylene glycol, maleic anhydride and DL-malic acid are mixed, then a catalyst is added, heated, nitrogen is introduced, stirred for reaction, then the temperature is raised, stirring for reaction is continued, during which the acid value of the product is continuously monitored, and the reaction is stopped when the acid value no longer changes; S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring, heating, and then adding an inhibitor and an antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly and then heating to react, monitoring the acid value of the product, and stopping the reaction when the acid value no longer changes, thereby obtaining a methacrylate malate photocurable resin.

3. The bio-based UV curable release agent according to claim 2, characterized in that: The catalyst is methanesulfonic acid, the inhibitor is inhibitor 701, and the antioxidant is antioxidant 1790.

4. The bio-based UV curable release agent according to claim 3, characterized in that: The methacrylate malate photocurable resin is prepared by the following method: S1. Mix 44-176 parts of phthalic anhydride, 30-120 parts of neopentyl glycol, 38-152 parts of diethylene glycol, 12-48 parts of maleic anhydride and 25-100 parts of DL-malic acid by weight, then add 0.5% of the mass of all raw materials of methanesulfonic acid as a catalyst, heat to 120-135° C., introduce nitrogen, stir and react at a speed of 150-600 r / min for 0.5-2h, then heat to 138-150° C., continue to stir and react, and continuously measure the acid value of the product during the reaction, and stop the reaction when the acid value no longer changes; S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 150-600r / min, heating to 70-90°C, and then adding 0.05-0.2% of inhibitor 701 and 0.5-2% of antioxidant 1790 accounting for the total mass of the reactants, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 100-120°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

5. The bio-based UV curable release agent according to claim 4, characterized in that: The methacrylate malate photocurable resin is prepared by the following method: S1. By weight, 88 parts of phthalic anhydride, 60 parts of neopentyl glycol, 76 parts of diethylene glycol, 24 parts of maleic anhydride and 49.23 parts of DL-malic acid were mixed, and then 0.5% of the mass of all raw materials of methanesulfonic acid was added as a catalyst, heated to 130°C, nitrogen was introduced, and stirred at a speed of 300r / min for 1h, and then the temperature was raised to 140°C, and the stirring reaction was continued. During this period, the acid value of the product was continuously measured, and the reaction was stopped when the acid value no longer changed; S2, cooling to room temperature, adding methacrylic acid of the same mass as DL-malic acid to the product of step S1, introducing nitrogen, stirring at 300r / min, heating to 80°C, and then adding 0.1% of the total mass of the inhibitor and 1% of the antioxidant, wherein the reactants include the product of step S1 and DL-malic acid; stirring evenly, heating to 110°C, reacting for 1h, and then starting to measure the acid value of the product, and stopping the reaction when the acid value no longer changes, to obtain methacrylate malate photocurable resin.

6. The bio-based UV curable release agent according to claim 1, characterized in that: The molecular weight of the terminal hydrogen-containing silicone oil is 15000-45000 g / mol, and the mass ratio of the terminal acrylate-modified silicone oil, the terminal hydrogen-containing silicone oil and the methacrylate malate photocurable resin is 1:1:0.1-1:4:

1.

7. The bio-based UV curable release agent according to claim 1, characterized in that: The mass ratio of pentaerythritol acrylate to terminal hydrogen-containing silicone oil is 0.5:1 to 5:

1.

8. The bio-based UV curable release agent according to claim 1, characterized in that: The pentaerythritol acrylate is one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate and pentaerythritol hexaacrylate.

9. A method for preparing a bio-based UV curable release agent according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing terminal acrylate modified silicone oil, terminal hydrogen-containing silicone oil, methacrylate malate photocurable resin, pentaerythritol acrylate and photoinitiator to obtain the bio-based UV curable release agent.

10. A bio-based UV curable release film, characterized in that: The bio-based UV curable release film is prepared by the following method: the bio-based UV curable release agent as claimed in claim 9 is evenly coated on a substrate, and cured by UV irradiation to obtain the bio-based UV curable release film.

Images