Modified silicone oil, coating liquid, release film, polaroid and preparation method

Abstract

The invention relates to modified silicone oil, a coating liquid, a release film, a polaroid and a preparation method, organic silicone oil is modified by adding polyurethane resin, epoxy resin and alkyd resin, and then the obtained modified silicone oil is prepared into the coating liquid, so that the coating liquid has excellent adhesiveness, coatability and the like; the coating liquid has excellent adhesiveness on a PET base layer, the prepared release film has excellent chemical stability and has good stripping force with a PSA adhesive layer, and the technical problem that the release film is difficult to tear and strip is solved.

Description

Technical Field

[0001] The present application relates to the technical field of polarizers, and in particular to a modified silicone oil, a coating liquid, a release film, a polarizer, and a preparation method. Background Art

[0002] As the core component of the liquid crystal display, the polarizing plate plays a vital role in the display effect. It is precisely attached to the upper and lower sides of the liquid crystal glass, and adjusts the passage of light by controlling the rotation of the liquid crystal, thereby achieving clear image display. The polarizing plate is composed of multiple layers of fine materials, among which PVA film, TAC film, protective film, release film and pressure-sensitive adhesive work together to ensure excellent display effects.

[0003] The release film plays a key role in the polarizing plate. It is attached to the surface of the pressure-sensitive adhesive and protects the main display material of the polarizing plate during manufacturing, transportation and assembly. However, the release film removal process is often challenging and difficult to peel off smoothly. This problem may not only lead to poor adhesion between the polarizing plate pressure-sensitive adhesive and the panel, thereby affecting the lighting performance of the panel, but may also damage the polarizing plate itself, seriously affecting the quality and reliability of the product. Therefore, the tearability of the release film has become a technical problem that needs to be solved urgently, which is of great significance for improving the overall performance of polarizing plates and liquid crystal displays. Summary of the invention

[0004] The purpose of the present application is to solve the technical problem that the release film is difficult to tear and peel off.

[0005] To solve the above technical problems, this application is implemented through the following technical solutions:

[0006] The present application provides a modified silicone oil, comprising the following components in parts by weight:

[0007]

[0008]

[0009] As a further improvement of the present application, the silicone oil is any one of dimethyl silicone oil, vinyl silicone oil, methyl trifluoropropyl silicone oil, and methyl hydrogen-containing silane; the polyurethane resin is any one of polyurethane resin, polybutadiene polyurethane, PU-30, PU-50, PU-80, and PU-90; the epoxy resin is any one of bisphenol A epoxy resin, E-12, E-51, E-44, and E-51G; and the alkyd resin is any one of hydroxypropyl methacrylate, methyl acrylate, H401, H402, H501, and H502.

[0010] To achieve the above object, the present application also provides a method for preparing the modified silicone oil described above, comprising the following steps:

[0011] S1. First, silicone oil is placed in a reaction container, and alkyd resin and butyltin triisooctanoate are added in sequence, and the mixture is stirred thoroughly and heated to 80° C. to 120° C., and reacted for 3 h to 6 h to obtain a first mixed solution;

[0012] S2, adding polyurethane resin and epoxy resin to the first mixed solution, stirring thoroughly and heating to 90-110° C., reacting for 3 h to 5 h to obtain a second mixed solution;

[0013] S3. Add sodium hydroxide and propionyl chloride to the second mixed solution and stir thoroughly. Maintain the temperature at 90-110° C. and react for 2-5 hours to obtain modified silicone oil.

[0014] To achieve the above object, the present application also provides a coating solution, which comprises the following components in parts by weight:

[0015]

[0016]

[0017] The modified silicone oil is the modified silicone oil described above or is prepared by the preparation method of the modified silicone oil described above.

[0018] As a further improvement of the present application, the photoinitiator is any one of a free radical photoinitiator, 184 photoinitiator, 907 photoinitiator, 1173 photoinitiator, 127 photoinitiator or 2959 photoinitiator, the surfactant is an organosilicon leveling agent or an acrylate leveling agent, the inorganic particles are any one of silicon dioxide particles, aluminum oxide particles, titanium dioxide particles, and zinc oxide particles, and the solvent is any one of butanone, ethyl acetate, butyl acetate, isopropanol, methyl isobutyl ketone, and toluene.

[0019] To achieve the above-mentioned purpose, the present application also provides a release film, comprising a base layer and a functional layer which are stacked, wherein the functional layer is prepared from the coating liquid mentioned above, and the material of the base layer is PET.

[0020] As a further improvement of the present application, the thickness of the base layer is ≥50 μm.

[0021] To achieve the above-mentioned purpose, the present application also provides a method for preparing the above-mentioned release film, comprising the following steps: first adding modified silicone oil, photoinitiator, surfactant, and solvent into a reaction container, fully stirring at a speed of 3600r / min, and standing at room temperature for 3 to 5 hours to obtain a release film coating liquid, and then uniformly coating the release film coating liquid on a 50uPET substrate, curing at a temperature of 140 to 160°C for 1.5 to 3 minutes, and then maturing at a temperature of 35 to 45°C for 36 to 60 hours.

[0022] To achieve the above object, the present application also provides a polarizer, including the release film described above or the release film prepared by the above preparation method, wherein the functional layer of the release film is tightly adhered to the PSA adhesive layer.

[0023] To achieve the above purpose, the present application also provides a method for preparing a polarizer, wherein the functional layer of the release film and the PSA adhesive layer are bonded together at a temperature of 110° C. to 115° C., and then the temperature is lowered and slowly dried.

[0024] The beneficial effects of the present application are as follows: The present application provides a modified silicone oil, which is modified by adding polyurethane resin, epoxy resin, and alkyd resin to modify the organic silicone oil, and then preparing the modified silicone oil into a coating liquid, so that the coating liquid has excellent adhesion and applicability, etc. The coating liquid has excellent adhesion on the PET base layer, and the prepared release film has excellent chemical stability and good peeling force with the PSA adhesive layer, which solves the technical problem that the release film is difficult to tear and peel off, realizes efficient tearing, improves production efficiency, and ensures the quality of the polarizer. DETAILED DESCRIPTION

[0025] The present application will be described in detail below in conjunction with various embodiments. However, these embodiments do not limit the present application, and any structural, methodological, or functional changes made by a person of ordinary skill in the art based on these embodiments are all within the scope of protection of the present application.

[0026] In order to solve the technical problem that the release film is difficult to tear off and peel off, the present application provides a modified silicone oil, including the following components in parts by weight: 40 to 80 parts of silicone oil, 2 to 13 parts of polyurethane resin, 1 to 5 parts of epoxy resin, 1 to 5 parts of alkyd resin, 0.05 to 0.3 parts of butyltin triisooctanoate, 0.1 to 0.4 parts of sodium hydroxide, and 50 to 90 parts of propionyl chloride.

[0027] In order to solve the above technical problems, the present application also provides a method for preparing the above-mentioned modified silicone oil, comprising the following steps:

[0028] S1. First, silicone oil is placed in a reaction container, and alkyd resin and butyltin triisooctanoate are added in sequence, and the mixture is stirred thoroughly and heated to 80° C. to 120° C., and reacted for 3 h to 6 h to obtain a first mixed solution;

[0029] S2, adding polyurethane resin and epoxy resin to the first mixed solution, stirring thoroughly and heating to 90-110° C., reacting for 3 h to 5 h to obtain a second mixed solution;

[0030] S3. Add sodium hydroxide and propionyl chloride to the second mixed solution and stir thoroughly. Maintain the temperature at 90-110° C. and react for 2-5 hours to obtain modified silicone oil.

[0031] To achieve the above-mentioned purpose, the present application also provides a coating liquid, which includes the following components in parts by weight: 30 to 70 parts of modified silicone oil, 0.2 to 1 part of photoinitiator, 0.1 to 0.5 parts of surfactant, 1.5 to 2 parts of inorganic particles, and 50 to 300 parts of solvent, wherein: the modified silicone oil is the modified silicone oil described above or is prepared by the preparation method of the modified silicone oil described above.

[0032] To achieve the above-mentioned purpose, the present application also provides a release film, comprising a base layer and a functional layer which are stacked, wherein the functional layer is prepared from the coating liquid mentioned above, and the material of the base layer is PET.

[0033] In an optional embodiment, the thickness of the base layer is ≥50 μm. If the thickness of the base layer is too thin, the polarizing plate may be easily warped.

[0034] To achieve the above-mentioned purpose, the present application also provides a method for preparing the above-mentioned release film, comprising the following steps: first adding modified silicone oil, photoinitiator, surfactant, and solvent into a reaction container, fully stirring at a speed of 3600r / min, and standing at room temperature for 3 to 5 hours to obtain a release film coating liquid, and then uniformly coating the release film coating liquid on a 50μm thick PET substrate, curing at a temperature of 140 to 160°C for 1.5 to 3min, and then maturing at a temperature of 35 to 45°C for 36 to 60h.

[0035] To achieve the above object, the present application also provides a polarizer, including the release film described above or the release film prepared by the above preparation method, wherein the functional layer of the release film is tightly adhered to the PSA adhesive layer.

[0036] To achieve the above purpose, the present application also provides a method for preparing a polarizer, wherein the functional layer of the release film and the PSA adhesive layer are laminated together at a temperature of 110°C to 115°C, and then the temperature is lowered and slowly dried. Laminating at a preset temperature avoids the problem of excessive adhesion between the release film and the PSA adhesive layer due to low temperature.

[0037] Based on the above technical solution, under the action of butyltin triisooctanoate catalyst, the hydroxyl groups in the silicone oil and the phthalic anhydride in the alkyd resin undergo an esterification ring-opening reaction to form carboxyl groups. This reaction not only enhances the compatibility of the silicone oil with the subsequent resin, but also improves the adhesion of the silicone oil to the substrate (such as PET) by introducing more polar groups (such as carboxyl groups). The enhanced adhesion means that the release film is less likely to fall off from the substrate during use, and also provides a more uniform peeling force for the subsequent peeling process.

[0038] Both polyurethane resin and epoxy resin have good flexibility, wear resistance and chemical resistance. The carboxyl group is further esterified with the oxetane in the polyurethane resin and the ethylene oxide in the epoxy resin to form a cross-linked network structure. This cross-linked structure not only increases the curing speed of the silicone oil, but also significantly enhances its flexibility, adhesion and solvent resistance. The improvement in flexibility allows the release film to disperse the peeling force more evenly when peeling, reducing tearing and residue; while the enhancement of solvent resistance ensures that the release film is not easily corroded when exposed to various solvents, thereby maintaining the stability of its peeling performance.

[0039] The introduction of polyurethane resin and epoxy resin also gives the release film better weather resistance and chemical stability, which means that the release film can maintain its stable peeling performance under various environmental conditions (such as high temperature, high humidity, ultraviolet radiation, etc.), thereby extending the service life of the release film.

[0040] In the technical solution of the present application, in the presence of a sodium hydroxide alkaline catalyst, propionyl chloride is used to cap the remaining terminal hydroxyl groups in the above-mentioned resin to obtain a modified silicone oil. Sodium hydroxide is used as an alkaline catalyst in this step, and its main function is to accept protons or give electron pairs, thereby activating the propionyl chloride molecules and making it easier to react with the terminal hydroxyl groups in the resin. Specifically, sodium hydroxide can provide an alkaline environment to promote the carbonyl carbon atom of propionyl chloride to form a negative carbon ion intermediate compound, which is more active and easy to undergo a nucleophilic substitution reaction with the terminal hydroxyl group.

[0041] When propionyl chloride reacts with the terminal hydroxyl group, an ester bond is generated, thereby eliminating the activity of the terminal hydroxyl group. This not only prevents further growth of the polymer chain, but also reduces the occurrence of side reactions, improving the stability and controllability of the product. The modified silicone oil after end-capping has better thermal stability, weather resistance, coating and curing properties. By precisely controlling the degree of end-capping, the adhesion between the modified silicone oil and the substrate can be adjusted, thereby achieving easy peeling. This not only improves production efficiency, but also reduces damage to the substrate during the peeling process.

[0042] Through the above modification process, the surface energy of silicone oil is effectively adjusted, so that the adhesion between the release film and the laminated material is precisely controlled. This balance of adhesion is the key to easy peeling. At the same time, the cross-linked network structure formed by the modified silicone oil also improves the mechanical strength of the release film, making it less likely to break during the peeling process.

[0043] In an optional embodiment, the silicone oil can be but not limited to any one of dimethyl silicone oil, vinyl silicone oil, methyl trifluoropropyl silicone oil, and methyl hydrogen-containing silane. The polyurethane resin can be but not limited to polybutadiene polyurethane, polyurethane resin, etc., and can also be PU-30, PU-50, PU-80, PU-90, etc. provided by East Asia Synthetic. The epoxy resin can be but not limited to bisphenol A type epoxy resin, etc., and can also be E-12, E-20, E-44, E-5, etc. provided by Shin Nakamura. The alkyd resin can be but not limited to hydroxypropyl methacrylate, methyl acrylate, etc., and can also be H401, H402, H501, H502, etc. provided by Osaka Organic Chemical.

[0044] In an optional embodiment, the photoinitiator can be but not limited to any one of a free radical photoinitiator, 184 photoinitiator, 907 photoinitiator, 1173 photoinitiator, 127 photoinitiator or 2959 photoinitiator, the surfactant can be but not limited to any one of a silicone leveling agent, an acrylate leveling agent, BYK307, BYK3700, GRANDIC, PC4100, the inorganic particles can be but not limited to any one of silicon dioxide particles, aluminum oxide particles, titanium dioxide particles, zinc oxide particles, the particle size of the inorganic particles is 1 μm to 3 μm, and the solvent can be but not limited to any one of butanone, ethyl acetate, butyl acetate, isopropanol, methyl isobutyl ketone, and toluene.

[0045] In order to verify that the technical solution of the present application has excellent effects, the following examples are provided.

[0046] Example 1

[0047] The present embodiment provides a modified silicone oil, comprising the following components in parts by weight: 40 parts of dimethyl silicone oil, 2 parts of polyurethane resin, 1 part of bisphenol A epoxy resin, 1 part of hydroxypropyl methacrylate, 0.05 parts of butyltin triisooctanoate, 0.1 parts of sodium hydroxide, and 50 parts of propionyl chloride.

[0048] The preparation method of modified silicone oil is as follows:

[0049] S1. First, 40 parts of dimethyl silicone oil are placed in a reaction container, and 1 part of hydroxypropyl methacrylate and 0.05 parts of butyltin triisooctanoate are added in sequence, and the mixture is stirred thoroughly and heated to 80° C. to 120° C., and reacted for 3 h to 6 h to obtain a first mixed solution;

[0050] S2, adding 2 parts of polyurethane resin and 1 part of bisphenol A epoxy resin to the first mixed solution, stirring thoroughly and heating to 90-110° C., reacting for 3 h to 5 h to obtain a second mixed solution;

[0051] S3. Add 0.1 parts of sodium hydroxide and 50 parts of propionyl chloride to the second mixed solution, stir thoroughly, maintain the temperature at 90-110° C., react for 2 h to 5 h, and obtain modified silicone oil.

[0052] This embodiment also provides a coating liquid, comprising the following components in parts by weight: 30 parts of modified silicone oil prepared in this embodiment, 0.2 parts of 184 photoinitiator, 0.1 parts of BYK307 surfactant, 1.5 parts of silica particles, and 50 parts of isopropyl alcohol, wherein: the particle size of the silica particles is 1 μm to 2 μm.

[0053] The present embodiment also provides a method for preparing a release film, comprising the following steps: first, 30 parts of modified silicone oil, 0.2 parts of photoinitiator, 0.1 parts of BYK307 surfactant, and 50 parts of isopropanol are added into a reaction container, and the mixture is stirred thoroughly to be uniformly mixed, and then 1.5 parts of silicon dioxide particles are added, and the mixture is stirred thoroughly at a speed of 3600 r / min, and the mixture is allowed to stand at room temperature for 3 hours to obtain a release film coating liquid, and the release film coating liquid is uniformly coated on a 50 μm thick PET substrate that has been subjected to corona treatment, and the mixture is cured at a temperature of 140° C. for 3 minutes, and then aged at a temperature of 35° C. for 60 hours to obtain a release film.

[0054] This embodiment also provides a polarizer, including a release film, a PSA adhesive, a lower protective layer, a polarizing layer, and an upper protective layer stacked in sequence from bottom to top. The preparation method of the polarizer is as follows:

[0055] A1. The PVA original film is sequentially swelled, dyed, bridged, stretched, washed, fixed, and dried to obtain a polarized film. The lower protective layer and the upper protective layer are respectively attached to the two opposite surfaces of the polarized film by UV glue. The photoinitiator in the UV glue absorbs ultraviolet light under the irradiation of ultraviolet light to generate active free radicals or cations, which trigger the polymerization and cross-linking chemical reactions of the monomers in the UV glue, so that the UV glue is converted from liquid to solid within a few seconds, thereby obtaining the original plate.

[0056] A2. Unwind the original plate, and evenly apply the PSA adhesive layer on one side of the original plate. At the same time, unwind the release film so that the release film and the PSA adhesive layer are closely attached together, and the functional layer of the release film is close to the PSA adhesive layer. The release film and the PSA adhesive layer are attached together in a 110°C oven, and then the oven temperature is lowered for slow drying.

[0057] Example 2

[0058] The present embodiment provides a modified silicone oil, comprising the following components in parts by weight: 80 parts of vinyl silicone oil, 13 parts of polybutadiene polyurethane, 5 parts of bisphenol A epoxy resin, 5 parts of methyl acrylate, 0.3 parts of butyltin triisooctanoate, 0.4 parts of sodium hydroxide, and 90 parts of propionyl chloride.

[0059] The preparation method of modified silicone oil is as follows:

[0060] S1, firstly put 80 parts of vinyl silicone oil into a reaction container, and add 5 parts of methyl acrylate and 0.3 parts of butyltin triisooctanoate in sequence, fully stir and heat to 120°C, react for 6 hours, and obtain a first mixed solution;

[0061] S2, adding 13 parts of polybutadiene polyurethane and 5 parts of bisphenol A epoxy resin to the first mixed solution, stirring thoroughly and heating to 110° C., reacting for 5 hours, to obtain a second mixed solution;

[0062] S3. Add 0.4 parts of sodium hydroxide and 90 parts of propionyl chloride to the second mixed solution, stir thoroughly, maintain the temperature at 110° C., react for 5 hours, and obtain modified silicone oil.

[0063] This embodiment also provides a coating liquid, comprising the following components in parts by weight: 70 parts of modified silicone oil prepared in this embodiment, 1 part of 184 photoinitiator, 0.5 parts of BYK307 surfactant, 2 parts of silica particles, and 300 parts of ethyl acetate, wherein: the particle size of the silica particles is 2 μm to 3 μm.

[0064] The present embodiment also provides a method for preparing a release film, comprising the following steps: first, adding 70 parts of modified silicone oil, 1 part of 184 photoinitiator, 0.5 part of BYK307 surfactant, and 300 parts of isopropanol into a reaction container, stirring and mixing them evenly, then adding 2 parts of silicon dioxide particles, stirring them evenly at a speed of 3600 r / min, standing at room temperature for 5 hours to obtain a release film coating liquid, and then uniformly coating the release film coating liquid on a 50 μm thick PET substrate that has been corona treated, curing at a temperature of 160° C. for 1.5 minutes, and then aging at a temperature of 45° C. for 36 hours to obtain a release film.

[0065] This embodiment also provides a polarizer, including a release film, a PSA adhesive, a lower protective layer, a polarizing layer, and an upper protective layer stacked in sequence from bottom to top. The preparation method of the polarizer is as follows:

[0066] A1. The PVA original film is sequentially swelled, dyed, bridged, stretched, washed, fixed, and dried to obtain a polarized film. The lower protective layer and the upper protective layer are respectively attached to the two opposite surfaces of the polarized film by UV glue. The photoinitiator in the UV glue absorbs ultraviolet light under the irradiation of ultraviolet light to generate active free radicals or cations, which trigger the polymerization and cross-linking chemical reactions of the monomers in the UV glue, so that the UV glue is converted from liquid to solid within a few seconds, thereby obtaining the original plate.

[0067] A2. Unwind the original plate, and evenly coat the PSA adhesive layer on one side of the original plate. At the same time, unwind the release film so that the release film and the PSA adhesive layer are tightly attached together, and the functional layer of the release film is close to the PSA adhesive layer. The release film and the PSA adhesive layer are attached together in a 115°C oven, and then the oven temperature is lowered for slow drying.

[0068] Example 3

[0069] The present embodiment provides a modified silicone oil, comprising the following components in parts by weight: 65 parts of dimethyl silicone oil, 8 parts of polyurethane resin, 3.5 parts of bisphenol A epoxy resin, 3.5 parts of hydroxypropyl methacrylate, 0.15 parts of butyltin triisooctanoate, 0.25 parts of sodium hydroxide, and 75 parts of propionyl chloride.

[0070] The preparation method of modified silicone oil is as follows:

[0071] S1, firstly put 65 parts of dimethyl silicone oil into a reaction container, and then add 3.5 parts of hydroxypropyl methacrylate and 0.15 parts of butyltin triisooctanoate, stir well and heat to 100°C, react for 4 hours, and obtain a first mixed solution;

[0072] S2, adding 8 parts of polyurethane resin and 3.5 parts of bisphenol A epoxy resin to the first mixed solution, stirring thoroughly and heating to 100° C., reacting for 4 hours, to obtain a second mixed solution;

[0073] S3. Add 0.25 parts of sodium hydroxide and 75 parts of propionyl chloride to the second mixed solution, stir thoroughly, maintain the temperature at 100° C., and react for 3 hours to obtain modified silicone oil.

[0074] This embodiment also provides a coating liquid, comprising the following components in parts by weight: 50 parts of modified silicone oil prepared in this embodiment, 0.6 parts of 184 photoinitiator, 0.35 parts of BYK307 surfactant, 1.8 parts of silica particles, and 200 parts of isopropyl alcohol, wherein: the particle size of the silica particles is 1 μm to 3 μm.

[0075] The present embodiment also provides a method for preparing a release film, comprising the following steps: first, 50 parts of modified silicone oil, 0.6 parts of 184 photoinitiator, 0.35 parts of BYK307 surfactant, and 200 parts of isopropanol are added into a reaction container, and the mixture is stirred and mixed uniformly, then 1.8 parts of silicon dioxide particles are added, and the mixture is stirred at a speed of 3600 r / min, and the mixture is allowed to stand at room temperature for 4 hours to obtain a release film coating liquid, and the release film coating liquid is uniformly coated on a 50 μm thick PET substrate that has been subjected to corona treatment, and the mixture is cured at a temperature of 150° C. for 2 minutes, and then aged at a temperature of 40° C. for 50 hours to obtain a release film.

[0076] This embodiment also provides a polarizer, including a release film, a PSA adhesive, a lower protective layer, a polarizing layer, and an upper protective layer stacked in sequence from bottom to top. The preparation method of the polarizer is as follows:

[0077] A1. The PVA original film is sequentially swelled, dyed, bridged, stretched, washed, fixed, and dried to obtain a polarized film. The lower protective layer and the upper protective layer are respectively attached to the two opposite surfaces of the polarized film by UV glue. The photoinitiator in the UV glue absorbs ultraviolet light under the irradiation of ultraviolet light to generate active free radicals or cations, which trigger the polymerization and cross-linking chemical reactions of the monomers in the UV glue, so that the UV glue is converted from liquid to solid within a few seconds, thereby obtaining the original plate.

[0078] A2. Unwind the original plate, and evenly coat the PSA adhesive layer on one side of the original plate. At the same time, unwind the release film so that the release film and the PSA adhesive layer are closely attached together, and the functional layer of the release film is close to the PSA adhesive layer. The release film and the PSA adhesive layer are attached together in a 112°C oven, and then the oven temperature is lowered to slowly dry.

[0079] Comparative Example 1

[0080] The difference between this comparative example and Example 3 is that the coating liquid, the release film and the polarizer are prepared directly using the same amount of dimethyl silicone oil without modifying the dimethyl silicone oil.

[0081] Comparative Example 2

[0082] The difference between this comparative example and Example 3 is that a PET substrate with a thickness of 38 μm is used in the preparation of the release film.

[0083] Test specification for lamination warping: Positive warping: Place the non-release film face up on the measuring platform, measure the warping of the un-torn release film and record it as a positive value; Negative warping: Place the release film face up on the measuring platform, measure the warping of the un-torn release film and record it as a negative value.

[0084] Initial peel force test specification: 1. Cut the finished product with the mechanical edge facing upward, with a size of 2.5cm*15cm; 2. Then use 31B tape to fix the auxiliary tape and the sample, and roll it gently with a (2KG) manual roller; 3. Turn on the tensile testing machine, select the 180°300mm / min test mode, and finally record the first peak value and average value.

[0085] The positive warpage, negative warpage and peeling force of the polarizers prepared in Examples 1-3 and Comparative Examples 1-2 were tested by standard methods. The test data are shown in Table 1.

[0086] Table 1 Performance data of polarizers prepared in Examples 1-3 and Comparative Examples 1-2

[0087]

[0088]

[0089] From the comparative analysis between Comparative Example 1 and Examples 1-3, it can be seen that the release film of Comparative Example 1 requires a greater peeling force, indicating that the release film prepared by using the silicone oil modified by the technical solution of the present application has a better peeling force.

[0090] From the comparative analysis of Comparative Example 2 and Examples 1-3, it can be seen that when a thicker PET substrate is used to prepare the release film, severe warping will not occur, and the warping degree is within the range allowed by the product quality.

[0091] It should be pointed out that the above is only used to explain the preferred embodiment of the present application, and is not intended to limit the present application in any form. Therefore, any modifications or changes made to the present application under the same inventive spirit should still be included in the scope of protection intended by the present application.

Claims

1. A modified silicone oil, characterized in that: The composition comprises the following components in parts by weight:

2. The modified silicone oil according to claim 1, characterized in that The silicone oil is any one of dimethyl silicone oil, vinyl silicone oil, methyl trifluoropropyl silicone oil, and methyl hydrogen-containing silane; the polyurethane resin is any one of polyurethane resin, polybutadiene polyurethane, PU-30, PU-50, PU-80, and PU-90; the epoxy resin is any one of bisphenol A epoxy resin, E-12, E-51, E-44, and E-51G; and the alkyd resin is any one of hydroxypropyl methacrylate, methyl acrylate, H401, H402, H501, and H502.

3. A method for preparing the modified silicone oil according to claim 1 or 2, characterized in that: The steps include: S1. First, silicone oil is placed in a reaction container, and alkyd resin and butyltin triisooctanoate are added in sequence, and the mixture is stirred thoroughly and heated to 80° C. to 120° C., and reacted for 3 h to 6 h to obtain a first mixed solution; S2, adding polyurethane resin and epoxy resin to the first mixed solution, stirring thoroughly and heating to 90-110° C., reacting for 3 h to 5 h to obtain a second mixed solution; S3. Add sodium hydroxide and propionyl chloride to the second mixed solution and stir thoroughly. Maintain the temperature at 90-110° C. and react for 2-5 hours to obtain modified silicone oil.

4. A coating liquid, characterized in that The coating solution includes the following components in parts by weight: The modified silicone oil is the modified silicone oil according to claim 1 or 2 or is prepared by the preparation method of the modified silicone oil according to claim 3.

5. The coating solution according to claim 4, characterized in that The photoinitiator is any one of a free radical photoinitiator, 184 photoinitiator, 907 photoinitiator, 1173 photoinitiator, 127 photoinitiator or 2959 photoinitiator; the surfactant is an organosilicon leveling agent or an acrylate leveling agent; the inorganic particles are any one of silicon dioxide particles, aluminum oxide particles, titanium dioxide particles, and zinc oxide particles; and the solvent is any one of butanone, ethyl acetate, butyl acetate, isopropanol, methyl isobutyl ketone, and toluene.

6. A release film, characterized in that: It comprises a stacked base layer and a functional layer, wherein the functional layer is prepared from the coating liquid according to any one of claims 4 to 5, and the base layer is made of PET.

7. The release film according to claim 6, characterized in that: The thickness of the base layer is ≥50 μm.

8. A method for preparing the release film according to claim 6 or 7, characterized in that: The method comprises the following steps: firstly adding modified silicone oil, a photoinitiator, a surfactant and a solvent into a reaction container, fully stirring at a rotation speed of 3600 r / min, standing at room temperature for 3 to 5 hours to obtain a release film coating liquid, and then uniformly coating the release film coating liquid on a 50uPET substrate, curing at a temperature of 140 to 160°C for 1.5 to 3 minutes, and then ripening at a temperature of 35 to 45°C for 36 to 60 hours.

9. A polarizer, characterized in that: It comprises the release film according to claim 6 or 7 or the release film prepared by the preparation method of claim 8, wherein the functional layer of the release film is tightly adhered to the PSA adhesive layer.

10. A method for preparing a polarizer, characterized in that: The functional layer of the release film and the PSA adhesive layer are bonded together at a temperature of 110°C to 115°C, and then the temperature is lowered and slowly dried.

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