A photocured release agent film and a production process thereof

Abstract

The application discloses a kind of photocuring release agent film and its production process, including the following steps to prepare hyperbranched polymethylsiloxane;The surface of original film is treated by corona and dust removal, then softened, then coated;Using hyperbranched polymethylsiloxane and compound light initiator to prepare compound photocuring silicon-based release agent, the original film is coated by compound photocuring silicon-based release agent, and is obtained in nitrogen atmosphere under ultraviolet light curing to obtain release film;To release film, post-curing process is obtained, photocuring release film is obtained.The application reduces the viscosity of polysiloxane by introducing hyperbranched structure, reduces the use of solvent or does not use solvent, reduces pollution;The ultraviolet light curing technology of hyperbranched polymethylsiloxane containing acrylate solves the problems of high production cost, harsh reaction conditions and increased side reactions in the prior art;Through optimized coating and curing film forming process, the final performance of release film product is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a photocurable release agent film and its production process, which is suitable for the technical field of release film. BACKGROUND

[0002] OCA (Optically Clear Adhesive) is a special adhesive used for bonding transparent optical components (such as lenses, etc.), and is one of the raw materials for important touch screens. This OCA glue must use high-performance PET release film as a carrier during production and use. However, due to the unique properties and special application requirements of OCA glue, it also puts forward ultra-high quality standards for the PET release film as a carrier.

[0003] The current mainstream PET release film or protective film uses traditional organic silicon material, which is cured and formed at high temperature through high-efficiency catalyst. The curing speed is slow, the energy consumption is high, the curing efficiency is low, and a small amount of free uncured silicone oil affects the release retention rate, and even volatile pollutants such as solvents and small-molecule organic substances are generated during the curing process, and the residual metal catalyst affects the product performance and application points. At the same time, its production process mainly uses ordinary coating machines to coat the organic silicon thermal curing components, and then in situ high-temperature curing on the PET film, which has problems such as a large amount of organic solvent volatilization, poor control of resin crosslinking degree, and more dirt.

[0004] Ultraviolet (UV) curing is a new energy-saving and environmentally friendly technology, which has the advantages of fast curing (film formation in seconds), uniform curing, room temperature curing, energy saving, environmental friendliness, etc., and is especially suitable for the molding of heat-sensitive components, as well as localized copying and photolithography of semiconductor circuits. Therefore, by introducing ultraviolet-curable functional groups into the polyalkylsiloxane unit, crosslinking and curing under ultraviolet irradiation show many advantages such as high efficiency, fast curing molding, clean and environmentally friendly, energy saving, etc. The obtained material has the advantages of temperature resistance, weather resistance, electrical insulation, low surface tension and low surface energy, etc. Introducing ultraviolet-curable bonds or epoxy groups into the silicone main chain as functional groups, after crosslinking and curing under ultraviolet irradiation, not only retains the advantages of organic silicon, but also has good film-forming property, color retention, high gloss, and excellent adhesion.

[0005] The existing coating and curing film forming process still has some shortcomings, many process conditions will directly affect the product performance and stability of the prepared release film. In the aspect of the original film, there are dust and other pollutants attached, there are leakage points in contact with the coating liquid, static residues, etc. In the coating process, the lack of stability and uniformity of the coating will eventually lead to the generation of coating lines, rainbow lines, which will directly affect the performance of the whole release film. The control of various tensions will directly affect the shrinkage problem of the product. It will further affect the photocuring process, causing the occurrence of longitudinal lines, water ripples, transverse lines and other adverse phenomena. If the winding tension control is not good, it is easy to cause the generation of tension lines in the winding process, and too much winding pressure will also cause the silicon of the release layer to transfer to the back of the PET release film, reduce the adhesion of the downstream customer's adhesive product, and thus affect the end use. The overall coating and curing film forming process is not good, which will also cause the molecular activity of the coating surface to be too strong, making the product performance unstable; the organic silicon coating pollutes the OCA glue and other problems. SUMMARY

[0006] The purpose of the present application is to provide a photocured release agent film and its production process.

[0007] The technical solution for achieving the purpose of the present application is as follows: a photocured release film, comprising an original film and a compounded photocured silicon-based release agent coated on the original film

[0008] A production process for a photocured release film, comprising the following steps:

[0009] Preparation of hyperbranched polymethylsiloxane;

[0010] After the surface of the original film is treated by corona and dust removal, it is softened, and then coated;

[0011] The compounded photocured silicon-based release agent is prepared by using hyperbranched polymethylsiloxane and a compounded photoinitiator, the original film is coated with the compounded photocured silicon-based release agent, and the release film is obtained by ultraviolet curing under a nitrogen atmosphere.

[0012] The release film is subjected to a post-curing process, and a photocured release film is obtained.

[0013] Further, the specific method for preparing hyperbranched polymethylsiloxane is as follows:

[0014] The end-amino polymethylsiloxane is prepared, and the hyperbranched polymethylsiloxane is prepared by using the end-amino polymethylsiloxane and trimethylolpropane triacrylate.

[0015] Further, the specific method for preparing end-amino polymethylsiloxane is as follows:

[0016] Select organic strong base as catalyst, amino double seal head as end-capping agent, catalyze ring siloxane open polymerization to obtain amino-terminated polymethylsiloxane, wherein the general structure of the amino-terminated polymethylsiloxane is:

[0017]

[0018] Wherein n=10-100, and n is an integer.

[0019] Further, the specific method for preparing the hyperbranched polymethylsiloxane by the amino-terminated polymethylsiloxane and trimethylolpropane triacrylate is as follows:

[0020] The trimethylolpropane triacrylate is mixed with the amino-terminated polymethylsiloxane according to 1:1, and then a good solvent is added to carry out Michael addition reaction to obtain the hyperbranched polymethylsiloxane, and the general structure of the hyperbranched polymethylsiloxane is:

[0021]

[0022] Wherein n=10-100, and n is an integer.

[0023] Further, the good solvent includes any one or more of tetrahydrofuran, ethyl acetate, toluene, xylene, butanone.

[0024] Further, the complex photoinitiator includes any two or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, 2,4,6(trimethylbenzoyl) diphenyl phosphine oxide, 2,4,6-trimethylbenzoyl phosphonic acid ethyl ester, 2-isopropylthioxanthone, 4-dimethylamino-benzoic acid ethyl ester.

[0025] Further, the organic strong base includes any one or more of quaternary ammonium salt, N-heterocyclic carbene, phosphine base

[0026] Further, the corona treatment value is greater than 50.

[0027] Further, the coating method is as follows: the reverse coating is carried out by using a honeycomb anilox roller, the coating speed is 55 m / min, and the coating wet amount per square meter is 5-7 g.

[0028] Compared with the prior art, the present application has the following advantages: by introducing the hyperbranched structure, the viscosity of the polysiloxane is reduced, the use of solvent is reduced or no solvent is used, and the pollution is reduced; the ultraviolet curing technology of the hyperbranched polymethylsiloxane containing acrylate solves the problems of high production cost, harsh reaction conditions and increased side reactions in the prior art; and through the optimized coating and curing film forming process, the final performance of the release film product is greatly improved, so that the release film is more flat and uniform, and the yield is improved. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. EMBODIMENT

[0030] A photocuring release film comprises a base film and a compound photocuring silicon-based release agent coated on the base film.

[0031] A production process of a photocuring release film comprises the following steps:

[0032] Step one,

[0033] First, an amino-terminated polymethylsiloxane is prepared:

[0034] An organic strong base is selected as a catalyst, the organic strong base is a quaternary ammonium salt, an amino double end cap is used as an end-capping agent, the catalyst and the end-capping agent are added at the same time, a catalytic ring siloxane ring-opening polymerization reaction is performed, the reaction temperature is 100°C, there is no solvent, the reaction time is 1h, after the reaction, acetonitrile is used for precipitation, acetonitrile is used for washing 3 times during the precipitation, and the amino-terminated polymethylsiloxane is dried to constant weight in a 30°C vacuum oven. The ring siloxane is opened to form a polymer chain by the organic strong base, and then the amino double end cap is capped. The conversion rate of the ring siloxane is 98%, and the reaction equation is as follows:

[0035]

[0036] The structural general formula of the amino-terminated polymethylsiloxane is as follows:

[0037]

[0038] Wherein n = 10-100, and n is an integer.

[0039] Secondly, a hyperbranched polymethylsiloxane is prepared:

[0040] Trimethylolpropane triacrylate and the amino-terminated polymethylsiloxane are mixed in a 1:1 ratio, a good solvent is added, and a Michael addition reaction is performed, the good solvent is selected from tetrahydrofuran and toluene, the reaction temperature is 40°C, the reaction time is 1h, after the reaction, acetonitrile is used for precipitation, acetonitrile is used for washing 3 times during the precipitation, and the hyperbranched polymethylsiloxane is dried to constant weight in a 30°C vacuum oven. The reaction efficiency is 98.4%, the good solvent is recycled and reused by distillation, and the reaction equation is as follows:

[0041]

[0042] wherein n = 10-100, and n is an integer.

[0043] The structural general formula of the hyperbranched polymethylsiloxane is:

[0044]

[0045] wherein n = 10-100, and n is an integer.

[0046] Step two, select OCA special optical grade PET film with better flatness and light transmittance as the original film, and perform corona treatment and dust removal treatment on the surface, wherein the corona value is 50 during the corona treatment, and the difference between any two points is ensured to be 5;

[0047] Preheat the original film, and then pre-coat an antistatic layer after softening the original film to eliminate static accumulation problems;

[0048] A honeycomb patterned roll is used for coating to ensure the uniformity and stability of the coating; reasonable oven tension, release tension, and take-up tension are controlled; the coating method is reverse coating, the angle between the sleeve and the doctor blade assembly and the gap between the doctor blade and the patterned roll can be changed by adjusting the bolts, so as to adjust the contact angle a and avoid hard contact between the doctor blade and the patterned roll, ensure the aperture volume fraction of the patterned roll and the uniformity of the coating of the surface layer of the film material, and thus ensure the uniformity of the coating, the coating wetness per square meter is 6 g; the coating amount between any two points of the PET release film is not more than 0.04 g / m2; the coating speed is 55 m / min, a CCD online detector is installed on the coating equipment to monitor the appearance abnormalities such as scratches, missed coating, white lines, and black lines in real time and issue an alarm;

[0049] Step three, using hyperbranched polymethylsiloxane (HPSi-MA) as the matrix, adding a compounded photoinitiator to prepare a compounded light-cured silicon-based release agent, the compounded photoinitiator is selected from 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone, the mass content of the compounded photoinitiator in the hyperbranched polymethylsiloxane is 0.5%, the original film is coated with the compounded light-cured silicon-based release agent, and the release film is obtained by ultraviolet curing under a nitrogen atmosphere;

[0050] Step four, the release film is subjected to post-curing process at a certain temperature and time to stabilize the small molecule structure in the release layer. The release film needs to meet the standard adhesive tape standard, wherein the standard adhesive tape standard is that the residual adhesion rate is 96% and the release force is stable at 9.8 g / in. Example

[0051] A light-cured release film, comprising an original film and a compounded light-cured silicon-based release agent coated on the original film.

[0052] A production process of a photocured release film, comprising the following steps:

[0053] Step one,

[0054] First, prepare the amino-terminated polymethylsiloxane:

[0055] Select an organic strong base as the catalyst, the organic strong base uses N-heterocyclic carbene, and an amino double-capped head is used as the capping agent. The catalyst and the capping agent are added at the same time to perform a catalytic ring siloxane ring-opening polymerization reaction. The reaction temperature is 115°C, there is no solvent, the reaction time is 2h, after the reaction, acetonitrile is used for precipitation, acetonitrile is used for washing 3 times during precipitation, and drying is performed in a 30°C vacuum oven until constant weight to obtain the amino-terminated polymethylsiloxane. The organic strong base is used to open the ring siloxane to form a polymer chain, and then the amino double-capped head is capped. The conversion rate of the ring siloxane is 98.8%, and the reaction equation is:

[0056]

[0057] The general structure of the amino-terminated polymethylsiloxane is:

[0058]

[0059] Wherein n=10-100, and n is an integer.

[0060] Second, prepare the hyperbranched polymethylsiloxane:

[0061] Mix trimethylolpropane triacrylate and amino-terminated polymethylsiloxane in a 1:1 ratio, add a good solvent, and then perform a Michael addition reaction. The good solvent is selected from tetrahydrofuran and ethyl acetate. The reaction temperature is 50°C, the reaction time is 1.5h, after the reaction, acetonitrile is used for precipitation, acetonitrile is used for washing 3 times during precipitation, and drying is performed in a 30°C vacuum oven until constant weight to prepare the hyperbranched polymethylsiloxane. The reaction efficiency is 98.9%, the good solvent is recycled and reused by distillation, and the reaction equation is:

[0062]

[0063] Wherein n=10-100, and n is an integer.

[0064] The general structure of the hyperbranched polymethylsiloxane is:

[0065]

[0066] Wherein n=10-100, and n is an integer.

[0067] Step two, select OCA special optical grade PET film with better flatness and light transmittance as the original film, and carry out corona treatment and dust removal treatment on the surface, wherein the corona value is 65 during corona treatment, and the difference between any two points is 4;

[0068] Preheat the original film, soften the original film, and then pre-coat an antistatic layer to eliminate static accumulation problems;

[0069] The honeycomb patterned roller is used for coating to ensure the uniformity and stability of the coating; reasonable oven tension, release tension and take-up tension are controlled; the coating method is reverse coating, the angle between the sleeve and the scraper assembly and the gap between the scraper and the patterned roller can be changed by adjusting the bolts, so as to adjust the contact angle α and avoid the hard contact between the scraper and the patterned roller, ensure the aperture volume rate of the patterned roller and the uniformity of the film material surface coating, thereby ensuring the uniformity of the coating, the coating wet weight per square meter is 6 g; the coating amount between any two points of the PET release film is not more than 0.04 g / m2; the coating speed is 55 m / min, and a CCD online detector is installed on the coating equipment to monitor the appearance abnormalities such as scratches, omissions, white lines and black lines in real time and issue an alarm;

[0070] Step three, using hyperbranched polymethylsiloxane (HPSi-MA) as the matrix, adding a compound photoinitiator to prepare a compound light-cured silicon-based release agent, the compound photoinitiator is selected from 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethyl benzoyl phosphonic acid ethyl ester, 2-isopropyl thioxanthone, and 4-dimethylamino-benzoic acid ethyl ester, the mass content of the compound photoinitiator in the hyperbranched polymethylsiloxane is 0.5%, the original film is coated with the compound light-cured silicon-based release agent, and the release film is obtained by ultraviolet curing in a nitrogen atmosphere;

[0071] Step four, the release film is subjected to post-curing process at a certain temperature and time to stabilize the small molecule structure in the release layer. The release film needs to meet the standard adhesive tape standard, wherein the standard adhesive tape standard is that the residual adhesion rate is 96% and the release force is stable at 9.8 g / in. Embodiment

[0072] A light-cured release film, comprising an original film and a compound light-cured silicon-based release agent coated on the original film.

[0073] A production process of a light-cured release film, comprising the following steps:

[0074] Step one,

[0075] First, prepare an amino-terminated polymethylsiloxane:

[0076] Selecting organic strong base as catalyst, organic strong base using phosphine chloride base, amino double seal head as end-capping agent, at the same time adding catalyst and end-capping agent, carrying out catalytic ring siloxane ring-opening polymerization reaction, reaction temperature is 135℃, no solvent, reaction time is 2.5h, after reaction, acetonitrile is used for precipitation, when precipitating, acetonitrile is used for washing 3 times, and drying in 30℃ vacuum oven until constant weight to prepare amino-terminated polymethylsiloxane, through organic strong base, ring siloxane is opened to form polymer chain, then amino double seal head is capped, ring siloxane conversion rate is 98.7%, and the reaction equation is:

[0077]

[0078] The structural general formula of amino-terminated polymethylsiloxane is:

[0079]

[0080] In which n=10-100, and n is an integer.

[0081] Secondly, preparing hyperbranched polymethylsiloxane:

[0082] Mixing trimethylolpropane triacrylate with amino-terminated polymethylsiloxane according to 1:1, adding good solvent after carrying out Michael addition reaction, good solvent includes dimethylbenzene, butanone, reaction temperature is 55℃, reaction time is 2h, after reaction, acetonitrile is used for precipitation, when precipitating, acetonitrile is used for washing 3 times, and drying in 30℃ vacuum oven until constant weight to prepare hyperbranched polymethylsiloxane, in which reaction efficiency is 99.1%, good solvent is recycled and reused by distillation, and the reaction equation is:

[0083]

[0084] In which n=10-100, and n is an integer.

[0085] The structural general formula of hyperbranched polymethylsiloxane is:

[0086]

[0087] In which n=10-100, and n is an integer.

[0088] Step two, selecting OCA special optical grade PET film with better flatness and light transmittance as original film, and carrying out corona treatment and dust removal treatment on the surface, in which the corona value is 60 during corona treatment, and the difference between any two points is ensured to be 3;

[0089] Preheating the original film, pre-coating an antistatic layer after softening the original film to eliminate static accumulation problem;

[0090] The honeycomb patterned roller is used for coating, so as to ensure the uniformity and stability of coating; the reasonable oven tension, release tension and take-up tension are controlled; the coating mode is reverse coating, the angle between the sleeve and the doctor blade assembly and the gap between the doctor blade and the patterned roller can be changed by adjusting the bolt, so as to adjust the contact angle α and avoid the hard contact between the doctor blade and the patterned roller, ensure the hole volume rate of the patterned roller and the uniformity of the surface layer of the film material, so as to ensure the uniformity of the coating, the wet coating amount per square meter is 5 g; the coating amount between any two points of the PET release film is not more than 0.04 g / m2; the coating speed is 55 m / min, and the CCD online detector is installed on the coating equipment to monitor the appearance abnormalities such as scratch, coating leakage, white line and black line in real time and issue an alarm;

[0091] Step three, using hyperbranched polymethylsiloxane (HPSi-MA) as the matrix, adding a compound photoinitiator, a compound photoinitiator is selected, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone, 2,4,6(trimethylbenzoyl) diphenyl phosphine oxide, the compound photoinitiator is 0.5% of the mass content of hyperbranched polymethylsiloxane, the original film is coated with the compound photoinitiated silicon-based release agent, and is ultraviolet cured in a nitrogen atmosphere to obtain a release film.

[0092] Step four, the release film is subjected to a post-curing process at a certain temperature and time to stabilize the small molecule structure in the release layer. The release film needs to meet the standard adhesive tape standard, wherein the standard adhesive tape standard is a residual adhesion rate of 96% and a release force stability of 9.8 g / in. Embodiment

[0093] A photocured release film, comprising an original film and a compound photoinitiated silicon-based release agent coated on the original film.

[0094] A production process of a photocured release film, comprising the following steps:

[0095] Step one,

[0096] First, an amino-terminated polymethylsiloxane is prepared:

[0097] An organic strong base is selected as a catalyst, the organic strong base uses quaternary ammonium salt and N-heterocyclic carbene, an amino double end cap is used as an end capping agent, the catalyst and the end capping agent are added at the same time, a ring-opening polymerization reaction of cyclosiloxane is carried out, the reaction temperature is 145°C, there is no solvent, the reaction time is 4h, after the reaction, acetonitrile is used for precipitation, acetonitrile is used for washing 3 times during precipitation, and the amino-terminated polymethylsiloxane is dried to constant weight in a 30°C vacuum oven. The organic strong base opens the cyclosiloxane to form a polymer chain, and then the amino double end cap is capped. The conversion rate of cyclosiloxane is 98.5%, and the reaction equation is as follows:

[0098]

[0099] The general structure of the terminal amino-containing polymethylsiloxane is:

[0100]

[0101] wherein n = 10-100, and n is an integer.

[0102] Secondly, the hyperbranched polymethylsiloxane is prepared:

[0103] The trimethylolpropane triacrylate is mixed with the terminal amino-containing polymethylsiloxane at a ratio of 1:1, and a good solvent is added to perform a Michael addition reaction, the good solvent is selected as tetrahydrofuran, the reaction temperature is 40-60°C, the reaction time is 1-2h, after the reaction, acetonitrile is used for precipitation, wherein the acetonitrile is washed for 3 times during the precipitation, and the hyperbranched polymethylsiloxane is prepared by drying to constant weight in a vacuum oven at 30°C, wherein the reaction efficiency is 98.6%, the good solvent is recycled by distillation and reused, and the reaction equation is:

[0104]

[0105] wherein n = 10-100, and n is an integer.

[0106] The general structure of the hyperbranched polymethylsiloxane is:

[0107]

[0108] wherein n = 10-100, and n is an integer.

[0109] In step two, the OCA special optical grade PET film with better flatness and light transmittance is selected as the original film, and the surface is subjected to corona treatment and dust removal treatment, wherein the corona value is 70 during the corona treatment, and the difference between any two points is ensured to be 3;

[0110] The original film is subjected to preheating treatment, and after softening the original film, an antistatic layer is first pre-coated to eliminate the problem of static electricity accumulation;

[0111] The honeycomb-shaped anilox roller is used for coating, so that the uniformity and stability of coating are ensured; the oven tension, the releasing tension and the take-up tension are controlled reasonably; the coating mode is reverse coating, the contact angle α can be adjusted and the hard contact between the doctor blade and the anilox roller can be avoided by adjusting the angle between the sleeve and the doctor blade assembly and the gap between the doctor blade and the anilox roller, so that the anilox roller hole volume rate and the uniformity of the surface coating of the film material are ensured, the coating wetness per square meter is 7 g, the coating amount between any two points of the PET release film is not more than 0.04 g / m2, the coating speed is 55 m / min, and the CCD online detector is installed on the coating equipment to monitor the appearance abnormalities such as scratches, coating leakage, white lines and black lines in real time and issue an alarm.

[0112] Step three, using hyperbranched polymethylsiloxane (HPSi-MA) as the matrix, adding a compound photoinitiator, a compound photocuring silicon-based release agent is prepared, the compound photoinitiator is selected from 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl benzene propyl ketone, 2-isopropyl thioxanthone, 4-dimethylamino-ethyl benzoate, the compound photoinitiator is 0.5% of the mass content of hyperbranched polymethylsiloxane, the original film is coated with the compound photocuring silicon-based release agent, and the release film is obtained by ultraviolet curing under a nitrogen atmosphere.

[0113] Step four, the release film is subjected to a post-curing process at a certain temperature and time to stabilize the small molecule structure in the release layer. The release film needs to meet the standard adhesive tape standard, wherein the standard adhesive tape standard is a residual adhesion rate of 96% and a release force stability of 9.8 g / in.

[0114] The photocured release films prepared in Examples 1, 2, 3 and 4 are detected with existing release films, and the following results are obtained:

[0115] The photocured release films prepared in Examples 1, 2, 3 and 4 have significantly improved release performance and significantly reduced preparation cost compared with existing polymethylsiloxane material films.

[0116] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A photocurable release film, characterized in that, Includes the original film, and a compounded photocurable silicone-based release agent coated on the original film; The manufacturing process of the photocurable release film includes the following steps: Preparation of hyperbranched polymethylsiloxane; The surface of the original film is softened after corona treatment and dust removal, and then coated. A composite photocurable silicon-based release agent was prepared by using hyperbranched polymethylsiloxane and a composite photoinitiator. The original film was coated with the composite photocurable silicon-based release agent and then cured with ultraviolet light under a nitrogen atmosphere to obtain a release film. A post-curing process is applied to the release film to obtain a photocurable release film. The specific method for preparing hyperbranched polymethylsiloxane is as follows: Amin-terminated polymethylsiloxanes were prepared, and hyperbranched polymethylsiloxanes were obtained by reacting the amino-terminated polymethylsiloxanes with trimethylolpropane triacrylate. The specific method for preparing amino-terminated polymethylsiloxane is as follows: Using a strong organic base as a catalyst and an amino-terminated bi-capping agent, the ring-opening polymerization of cyclosiloxanes was catalyzed to prepare amino-terminated polymethylsiloxanes, wherein the general structural formula of the amino-terminated polymethylsiloxanes is: Where n = 10 - 100, and n is an integer; The specific method for preparing hyperbranched polymethylsiloxane by reacting amino-terminated polymethylsiloxane with trimethylolpropane triacrylate is as follows: Trimethylolpropane triacrylate and amino-terminated polymethylsiloxane were mixed in a 1:1 ratio, and a good solvent was added before a Michael addition reaction was carried out to obtain hyperbranched polymethylsiloxane. The general structural formula of hyperbranched polymethylsiloxane is as follows: Where n = 10 - 100, and n is an integer.

2. The production process of a photocurable release film according to claim 1, characterized in that, The good solvent includes one or more of tetrahydrofuran, ethyl acetate, toluene, xylene, and butanone.

3. The production process of a photocurable release film according to claim 1, characterized in that, The composite photoinitiator includes any two or more of the following: 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, 2-isopropylthioxanthraphenone, and ethyl 4-dimethylaminobenzoate.

4. The production process of a photocurable release film according to claim 1, characterized in that, The organic strong base includes one or more of quaternary ammonium salts, N-heterocyclic carbene, and phosphononitrile bases.

5. The production process of a photocurable release film according to claim 1, characterized in that, The corona value is greater than 50 during the corona treatment.

6. The production process of a photocurable release film according to claim 1, characterized in that, The coating method is as follows: reverse coating is performed using a honeycomb anilox roller at a coating speed of 55 m / min, and the wet coating amount per square meter is 5-7 g.

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