A uv protection film and a method for manufacturing the same

Abstract

The application relates to the technical field of UV protective film, in particular to a UV protective film and a preparation method thereof.A UV protective film comprises a PET base material and an adhesive layer coated on the base material; the combined material of the adhesive layer comprises raw materials with the following weight components: vinyl silicone oil, methyl MQ resin, vinyl MQ resin, hydrogen-containing silicone oil, hydroxyl-terminated silicone oil, inhibitor, tackifier and photocatalyst; the tackifier is prepared by taking tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane and 2, 4, 6, 8-tetramethyl-2, 4, 6, 8-tetrakis[3-(oxiranylmethyloxy)propyl]cyclotetrasiloxane as monomers, trimethylmethoxysilane as a chain terminator and tetrabutyl titanate as a catalyst.The UV protective film prepared by the application has the advantage of good adhesion to a glass base material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of UV protective film, more particularly, it relates to a UV protective film and a preparation method thereof. BACKGROUND

[0002] The protective film is a general term of functional films for protecting the surface of products from damage or contamination. The protective film generally uses PE, PVC, PET, oriented polypropylene (OPP), PI, PU, etc. as the base material, and applies pressure-sensitive adhesive as the adhesive layer on the surface of the base material, which can protect and isolate the surface of metal, metal coating, plastic, automobile, electronic product, signboard, profile and other products. The silicone pressure-sensitive adhesive generally refers to the pressure-sensitive adhesive with silicone polymer as the main body. Compared with traditional acrylate pressure-sensitive adhesive and rubber type pressure-sensitive adhesive, the silicone pressure-sensitive adhesive has good high and low temperature resistance, chemical inertness, corrosion resistance, and excellent adhesive strength, initial tack and air release property, and can adhere to low surface energy substrates, greatly expanding its application range. The silicone pressure-sensitive adhesive has no residue when removed, and the peeling force curve is stable, so it is widely used in the protective film industry and has become an indispensable important material in this field.

[0003] At present, the addition type silicone pressure-sensitive adhesive has excellent high temperature resistance, weather resistance, electrical insulation and low volatility, and the application demand in high-end fields such as electronic device packaging, optical film bonding and medical protection continues to rise, and has achieved rapid development in recent years. However, its own defects such as insufficient adhesive strength and weak adhesion to polar substrates seriously restrict its application in more scenarios. In order to improve this problem, two types of technical paths are usually adopted in the industry: one is to perform plasma, corona and other activation pretreatment on the surface of the substrate, and to enhance the interfacial bonding force by increasing the surface energy of the substrate; the second is to directly add tackifiers containing active groups such as hydroxyl and carboxyl in the silicone pressure-sensitive adhesive system, and to optimize the adhesive performance by chemical interaction. Compared with the former, the latter does not require additional substrate treatment process, which not only can significantly improve the production efficiency, but also can reduce the equipment investment and process cost, and is more in line with the industrial production demand. At the same time, the ultraviolet radiation (UV) curing technology has been widely used in the fields of adhesives, coatings and other fields due to its fast curing speed, no solvent volatilization, energy consumption only 1 / 5-1 / 10 of thermal curing, and safe and reliable operation. However, unfortunately, the current combination of UV curing technology and addition type silicone pressure-sensitive adhesive for preparing high performance UV curing type silicone protective film is still relatively rare, and this direction has both technical innovation and market application potential, which needs to be further explored. SUMMARY

[0004] In order to further improve the adhesive performance of the adhesive layer in the protective film, the present application provides a UV protective film and a preparation method thereof.

[0005] In a first aspect, the application provides a UV protective film, which uses the following technical solution:

[0006] A UV protective film, comprising a PET substrate and an adhesive layer coated on the substrate; the combined material of the adhesive layer comprises the following raw materials by weight: 50 parts of vinyl silicone oil, 40-60 parts of methyl MQ resin, 3-7 parts of vinyl MQ resin, 1.5-1.8 parts of hydrogen-containing silicone oil, 5-10 parts of hydroxyl-terminated silicone oil, 0.05-0.3 parts of inhibitor, 1-1.5 parts of tackifier, and 0.003-0.004 parts of photocatalyst.

[0007] Further, the vinyl silicone oil includes end-vinyl silicone oil and methyl-vinyl silicone oil, and the mass ratio of the end-vinyl silicone oil to the methyl-vinyl silicone oil is (30-50):1; the viscosity of the end-vinyl silicone oil is 1000-25000 mPa·s, and the viscosity of the methyl-vinyl silicone oil is 5000-20000 mPa·s.

[0008] By using the above technical solution, in the adhesive formula, the vinyl silicone oil is the main structure in the adhesive, the viscosity of the vinyl silicone oil is relatively small, which ensures the basic performance of the pressure-sensitive adhesive and facilitates coating, the end-vinyl silicone oil and the hydroxyl-terminated silicone oil with appropriate viscosity are combined for use, the end-vinyl silicone oil provides the required cohesion for the adhesive, and the addition of the hydroxyl-terminated silicone oil can improve the adhesion performance, pressure sensitivity and bubble removal effect of the adhesive on glass, so that the adhesive is more easily attached.

[0009] Further, the silicon-hydrogen ratio of the hydrogen-containing silicone oil to the vinyl silicone oil is 1.0-1.2.

[0010] By using the above technical solution, the appropriate crosslinking degree can be obtained by selecting the silicon-hydrogen ratio in the above proportion, and the adhesive has appropriate adhesion performance.

[0011] Further, the M / Q of the methyl MQ resin is 0.8-1.0.

[0012] By using the above technical solution, the methyl MQ resin and the vinyl MQ resin are used in combination, the end of the methyl MQ resin structure contains more alkoxy groups and a small part of hydroxyl groups, which mainly plays a role in increasing adhesion in the adhesive system; the vinyl MQ resin is mainly used to improve the physical adsorption capacity of the UV protective film on the vehicle window and the cohesive strength of the adhesive itself.

[0013] Further, the photocatalyst is one or more of acetylacetone platinum, trimethylmethylcyclopentadiene platinum, and cis-dichloro bis (triphenylphosphine) platinum.

[0014] Further, the inhibitor is propargyl alcohol and / or butynediol.

[0015] By adopting the above technical scheme, the addition of the inhibitor can prolong the operation time of the UV protective film.

[0016] Further, the adhesion promoter is prepared by mixing monomers tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethylene methoxy) propyl] cyclotetrasiloxane, and trimethylmethoxysilane under nitrogen, adding tetrabutyl titanate dropwise, stirring and reacting, and discharging and processing to obtain the adhesion promoter.

[0017] Further, the molar amount ratio of the tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethylene methoxy) propyl] cyclotetrasiloxane, and trimethylmethoxysilane is (0.3-0.5):(0.1-0.3):(0.2-0.4):(0.15-0.25):(0.1-0.2).

[0018] Further, the amount of tetrabutyl titanate is 0.2%-0.7% of the total mass of the monomers.

[0019] Further, in the preparation of the adhesion promoter, the reaction temperature is 40-65°C, and the reaction time is 8-12h.

[0020] By adopting the above technical scheme, since the polyorganosiloxane molecular main chain of the MQ resin and the vinyl silicone oil has only nonpolar groups, the adhesive has poor adhesion to the base, and only has a surface physical adsorption effect. In the present application, tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, and 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethylene methoxy) propyl] cyclotetrasiloxane are used as monomers, trimethylmethoxysilane is used as a chain terminator, and tetrabutyl titanate is used as a catalyst to prepare an adhesion promoter having multifunctional groups of phenyl, epoxy, and alkenyl. When the adhesion promoter is added to the adhesive, the adhesive and the PET coated substrate can form a good bond. In addition, the adhesion promoter also promotes the dark curing in the adhesive layer. The adhesion promoter gradually reacts with the hydroxyl groups on the surface of the PET coated substrate to form a chemical bond. The bonding effect between the UV protective film and the PET coated substrate is stronger, and the adhesion is also enhanced.

[0021] In a second aspect, the present application provides a preparation method of a UV protective film, including the following steps: dissolving and mixing ethyl acetate, methyl MQ resin, vinyl MQ resin, hydrogen-containing silicone oil, hydroxyl-terminated silicone oil, an inhibitor, and an adhesion promoter uniformly, and then mixing and stirring with a photocatalyst to obtain an adhesive; and coating the adhesive on the surface of a PET substrate and irradiating with UV to cross-link and cure the adhesive layer.

[0022] In summary, the present application has the following advantages:

[0023] 1. The present application adopts vinyl silicone oil, methyl MQ resin, vinyl MQ resin, hydrogen-containing silicone oil, hydroxyl-terminated silicone oil, inhibitor, tackifier, photocatalyst as the raw material components of the UV protective film adhesive layer. By reasonable proportioning, an adhesive is prepared. The prepared adhesive has good bonding effect between PET coated substrate and automobile glass, is resistant to aging, and has no residual glue after peeling.

[0024] 2. In the present application, tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxiranylmethoxy)propyl]cyclotetrasiloxane are used as monomers, trimethylmethoxysilane is used as chain terminator, and tetrabutyl titanate is used as catalyst. A tackifier with multifunctional groups of phenyl, epoxy and alkenyl is prepared and added to the adhesive. Through the π-π interaction of phenyl and the polar adsorption of epoxy, the physical interfacial action with the PET substrate is enhanced, and the initial adhesion and peel strength are improved. Through the chemical reaction of epoxy and hydroxyl, chemical bonding is formed, which significantly improves the peel strength and long-term adhesion to glass. Finally, the adhesion properties such as initial adhesion, peel, and adhesion of the UV protective film are improved, making the adhesion to glass more stable.

[0025] 3. The UV protective film of the present application has the advantages of environmental protection, energy saving, high efficiency, and low VOC emission.

[0026] 4. The UV protective film prepared by the preparation method of the present application has good adhesion to glass substrate. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in combination with examples.

[0028] The raw materials of the examples and comparative examples of the present application are all ordinary commercial products unless otherwise specified.

[0029] Example 1

[0030] A UV protective film, comprising a PET substrate and an adhesive layer coated on the substrate; the combined material of the adhesive layer comprises the following raw materials by weight: vinyl silicone oil 50g, methyl MQ resin 40g, vinyl MQ resin 3g, hydrogen-containing silicone oil 1.5g, hydroxyl-terminated silicone oil 5g, inhibitor 0.05g, tackifier 1g, photocatalyst 0.003g.

[0031] In the embodiment, the vinyl silicone oil includes end vinyl silicone oil and methyl vinyl silicone oil, and the mass ratio of the end vinyl silicone oil to the methyl vinyl silicone oil is 30:1; the viscosity of the end vinyl silicone oil is 1000 mPa·s, and the viscosity of the methyl vinyl silicone oil is 20000 mPa·s.

[0032] In the embodiment, the silicon-hydrogen ratio of the hydrogen-containing silicone oil to the vinyl silicone oil is 1.0.

[0033] In the embodiment, the M / Q of the methyl MQ resin is 0.8.

[0034] In the embodiment, the photocatalyst is acetylacetone platinum.

[0035] In the embodiment, the inhibitor is butynediol.

[0036] In the embodiment, the adhesion promoter is prepared by mixing monomers tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxiranylmethyloxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane under nitrogen, adding tetrabutyl titanate dropwise, stirring and reacting at 40°C for 8 h, adding sodium bicarbonate for neutralization, controlling the pH of the system to be neutral, distilling under reduced pressure, then slowly dropping into an excess of poor solvent methanol, and stirring to precipitate the adhesion promoter polymer (small molecular impurities remain in the solvent). After standing, filtration is performed, the precipitate is collected, washed with a small amount of poor solvent, and dried to obtain the adhesion promoter.

[0037] The molar amount ratio of the tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxiranylmethyloxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane is 0.3:0.1:0.2:0.15:0.1.

[0038] The amount of tetrabutyl titanate is 0.2% of the total mass of the monomers.

[0039] The yield of the adhesion promoter is 85.2%.

[0040] Example 2

[0041] A UV protective film includes a PET substrate and an adhesive layer coated on the substrate; the combined material of the adhesive layer includes the following raw materials by weight: 50 g of vinyl silicone oil, 50 g of methyl MQ resin, 5 g of vinyl MQ resin, 1.7 g of hydrogen-containing silicone oil, 8 g of hydroxyl-terminated silicone oil, 0.15 g of inhibitor, 1.2 g of adhesion promoter, and 0.004 g of photocatalyst.

[0042] In the embodiment, the vinyl silicone oil includes end vinyl silicone oil and methyl vinyl silicone oil, and the mass ratio of the end vinyl silicone oil to the methyl vinyl silicone oil is 40:1; the viscosity of the end vinyl silicone oil is 10000 mPa·s, and the viscosity of the methyl vinyl silicone oil is 15000 mPa·s.

[0043] In the embodiment, the silicon-hydrogen ratio of the hydrogen-containing silicone oil to the vinyl silicone oil is 1.1.

[0044] In the embodiment, the M / Q of the methyl MQ resin is 0.9.

[0045] In the embodiment, the photocatalyst is trimethylmethylcyclopentadiene platinum.

[0046] In the embodiment, the inhibitor is butynediol.

[0047] In the embodiment, the adhesion promoter is prepared by mixing monomers tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethyloxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane under nitrogen, adding tetrabutyl titanate dropwise, stirring and reacting at 55°C for 10 h, neutralizing by adding sodium bicarbonate, controlling the pH of the system to be neutral, distilling under reduced pressure, then slowly dropping into an excess of poor solvent methanol, and stirring to precipitate the adhesion promoter polymer (small molecular impurities remain in the solvent). After standing, filtration is performed, the precipitate is collected, washed with a small amount of poor solvent, and dried to obtain the adhesion promoter.

[0048] The molar amount ratio of the tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethyloxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane is 0.4:0.3:0.3:0.2:0.15.

[0049] The amount of tetrabutyl titanate is 0.5% of the total mass of the monomers.

[0050] The yield of the adhesion promoter is 87.4%.

[0051] Embodiment 3

[0052] A UV protective film includes a PET substrate and an adhesive layer coated on the substrate; the combined material of the adhesive layer includes the following raw materials by weight: 50 g of vinyl silicone oil, 60 g of methyl MQ resin, 7 g of vinyl MQ resin, 1.8 g of hydrogen-containing silicone oil, 10 g of hydroxyl-terminated silicone oil, 0.3 g of inhibitor, 1.5 g of adhesion promoter, and 0.004 g of photocatalyst.

[0053] In the embodiment, the vinyl silicone oil includes end vinyl silicone oil and methyl vinyl silicone oil, and the mass ratio of the end vinyl silicone oil to the methyl vinyl silicone oil is 50:1; the viscosity of the end vinyl silicone oil is 25000 mPa·s, and the viscosity of the methyl vinyl silicone oil is 5000 mPa·s.

[0054] In the embodiment, the silicon-hydrogen ratio of the hydrogen-containing silicone oil to the vinyl silicone oil is 1.2.

[0055] In the embodiment, the M / Q of the methyl MQ resin is 1.0.

[0056] In the embodiment, the photocatalyst is cis-dichlorobis(triphenylphosphine) platinum.

[0057] In the embodiment, the inhibitor is propargyl alcohol.

[0058] In the embodiment, the adhesion promoter is prepared by the following method: monomers tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethylene methoxy) propyl] cyclotetrasiloxane, and trimethylmethoxysilane are mixed under nitrogen, tetra-n-butyl titanate is added dropwise, stirring is performed at 65℃ for 12h, sodium bicarbonate is added dropwise for neutralization, the pH of the system is controlled to be neutral, vacuum distillation is performed, then the adhesion promoter is slowly added dropwise into an excess of a poor solvent methanol, stirring is performed to precipitate the adhesion promoter polymer (small molecular impurities remain in the solvent). After standing, filtration is performed, the precipitate is collected, washed with a small amount of a poor solvent, and dried to obtain the adhesion promoter.

[0059] The molar amount ratio of the tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetrakis[3-(oxymethylene methoxy) propyl] cyclotetrasiloxane, and trimethylmethoxysilane is 0.5:0.3:0.4:0.25:0.2.

[0060] The amount of the tetra-n-butyl titanate is 0.7% of the total mass of the monomers.

[0061] The yield of the adhesion promoter is 84.3%.

[0062] A preparation method of a UV protective film includes the following steps: vinyl silicone oil, methyl MQ resin, vinyl MQ resin, hydrogen-containing silicone oil, end hydroxyl silicone oil, inhibitor, and adhesion promoter are dissolved and mixed uniformly with a small amount of ethyl acetate (20% of the total mass), then mixed with a photocatalyst, stirred uniformly, and placed to discharge bubbles to obtain an adhesive; a PET substrate is placed on a coating machine, the adhesive is uniformly coated on the surface of the PET substrate (the thickness is about 18μm, the coating speed is 5cm / s, and the coating temperature is 25℃), then UV (the wavelength is 405nm, and the energy is 1000mJ / cm 2The adhesive layer is cross-linked and cured by irradiation.

[0063] Comparative Example 1

[0064] The same as Example 3, but the reaction temperature in the preparation of the tackifier of the present comparative example was set to 80℃. The tackifier yield was 55.7%, which was lower than the yield.

[0065] Comparative Example 2

[0066] The same as Example 3, but the viscosity of the terminal vinyl silicone oil of the present comparative example was 50000 mPa·s.

[0067] Comparative Example 3

[0068] The same as Example 3, but the amount of the methyl MQ silicone resin of the present comparative example was adjusted to 80g.

[0069] Comparative Example 4

[0070] The same as Example 3, but the tackifier of the present comparative example used a commercially available methyl silicone resin.

[0071] Performance Test

[0072] The UV protective films prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 3 were tested for 180° peeling force performance after photocuring for 3h using a peeling force tester according to the GB / T2792-2014 standard.

[0073] The UV protective films prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 3 were tested for holding tack performance after photocuring for 3h using a rotational viscometer tester according to the GB / T4851-2014 standard.

[0074] The UV protective films prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 3 were tested for initial tack performance after photocuring for 3h using an initial tack tester according to the GB / T4852-2002 standard.

[0075] The UV protective films prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 3 were tested for adhesion performance according to the GB / T9286-1998 standard after photocuring for 3h.

[0076] High temperature and high humidity aging resistance performance: The UV protective films prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 3 were attached to the surface of a glass substrate (automobile glass) and placed in a constant temperature and humidity test machine (temperature 90℃, humidity 90%), and the peeling force and appearance of the UV protective film were tested on the 7th day.

[0077] Water hot aging resistance: the prepared UV protective film was placed in a constant temperature water bath, the temperature of water was set to 100℃, and the adhesion of the adhesive to the PET coated substrate was tested after 100 min of water hot.

[0078] The above test results are shown in Table 1:

[0079] Table 1 Performance test

[0080]

[0081] As can be seen from Table 1, the adhesive in the UV protective film has good bonding effect between the PET coated substrate and the automobile glass, is resistant to aging, and has no residual glue after peeling.

[0082] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the present application.

Claims

1. A UV protective film, characterized in that, The product includes a PET substrate and an adhesive layer coated on the substrate; the adhesive forming the adhesive layer comprises the following raw materials by weight: 50 parts vinyl silicone oil, 40-60 parts methyl MQ resin, 3-7 parts vinyl MQ resin, 1.5-1.8 parts hydrogen-containing silicone oil, 5-10 parts hydroxyl-terminated silicone oil, 0.05-0.3 parts inhibitor, 1-1.5 parts tackifier, and 0.003-0.004 parts photocatalyst; The vinyl silicone oil includes terminal vinyl silicone oil and methyl vinyl silicone oil, with a mass ratio of (30-50):1 between the terminal vinyl silicone oil and the methyl vinyl silicone oil; the viscosity of the terminal vinyl silicone oil is 1000-25000 mPa·s, and the viscosity of the methyl vinyl silicone oil is 5000-20000 mPa·s. The tackifier is prepared by the following method: under nitrogen atmosphere, the monomers tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetra[3-(epoxyethylene methoxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane are mixed, tetrabutyl titanate is added dropwise, the mixture is stirred and reacted, and the mixture is discharged to obtain the tackifier; The molar ratio of the tetramethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetra[3-(epoxyethylene methoxy)propyl]cyclotetrasiloxane, and trimethylmethoxysilane is (0.3-0.5):(0.1-0.3):(0.2-0.4):(0.15-0.25):(0.1-0.2). In the preparation of the thickener, the reaction temperature is 40-65℃ and the reaction time is 8-12h.

2. The UV protective film according to claim 1, characterized in that, The silicon-to-hydrogen ratio in the hydrogen-containing silicone oil and the vinyl silicone oil is 1.0-1.

2.

3. The UV protective film according to claim 1, characterized in that, The M / Q ratio in the methyl MQ resin is 0.8-1.

0.

4. The UV protective film according to claim 1, characterized in that, The photocatalyst is one or more of acetylacetonate platinum, trimethylmethylcyclopentadiene platinum, and cis-dichlorobis(triphenylphosphine)platinum; the inhibitor is propynyl alcohol and / or butynediol.

5. A UV protective film according to claim 1, characterized in that, The amount of tetrabutyl titanate used is 0.2%-0.7% of the total mass of the monomers.

6. A method for preparing a UV protective film as described in any one of claims 1-5, characterized in that, Includes the following steps: Vinyl silicone oil, methyl MQ resin, vinyl MQ resin, hydrogen-containing silicone oil, hydroxyl-terminated silicone oil, inhibitor, and tackifier are dissolved and mixed evenly with ethyl acetate, then mixed with photocatalyst, stirred evenly, and allowed to stand to remove bubbles to obtain adhesive; the adhesive is evenly coated on the surface of PET substrate, and UV irradiation is used to crosslink and cure the adhesive layer.

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