A protective film for a display and a method of manufacturing the same

Abstract

This invention discloses a protective film for displays and its preparation method. From top to bottom, it includes an antifouling layer, a PET base layer, and an adhesive layer. The antifouling layer is made from an antifouling agent, which includes the following raw materials: modified epoxy acrylate resin, photoinitiator, leveling agent, hydrophobic agent, coupling agent KH560, and xylene. The modified epoxy acrylate resin is prepared by reacting pretreated epoxy acrylate resin and the modifier as raw materials. The modified epoxy acrylate resin molecular chain contains organosilicon segments, which can reduce the surface free energy of the antifouling layer, thereby reducing the adsorption of dust on the protective film. Simultaneously, the quaternary ammonium salt structure of the main chain and the presence of polypyrrole side chains make it difficult for charges to accumulate on the surface of the antifouling layer, thus avoiding static electricity and reducing the strength of electrostatic adsorption. This makes the protective film surface less prone to dust accumulation, ensuring the aesthetic appearance of the protective film.

Description

Technical Field

[0001] This invention relates to the field of display manufacturing technology, and specifically to a protective film for displays and its preparation method. Background Technology

[0002] With the rapid development of science and technology and the continuous improvement of people's living standards, electronic devices, including mobile phones and tablets, are becoming increasingly popular. Most of these electronic devices are equipped with touch-screen displays. Touch-screen displays not only have the advantages of large display size and vibrant colors, significantly enhancing the user's visual experience, but their touch functionality also allows users to directly interact with the screen to receive and respond to information, making human-computer interaction simpler, more convenient, and more intuitive. However, displays are relatively fragile, exhibiting poor resistance to pressure and abrasion, making them prone to breakage, scratches, and other irreversible damage during use. Therefore, protective films are needed. Existing protective films can effectively protect the display, but due to electrostatic adsorption, a large amount of dust will accumulate on the surface of the protective film, thus affecting the normal use of the display. Summary of the Invention

[0003] The purpose of this invention is to provide a protective film for displays and its preparation method, thereby solving the problem that current protective films for displays are prone to electrostatic adsorption, resulting in unclear displays and affecting normal use.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A protective film for displays comprises, from top to bottom, an anti-fouling layer, a PET base layer, and an adhesive layer. The anti-fouling layer is made of an anti-fouling agent, which comprises the following raw materials in parts by weight: 25-35 parts modified epoxy acrylate resin, 0.1-2 parts photoinitiator, 1-2 parts leveling agent, 4-6 parts hydrophobic agent, 0.5-4 parts coupling agent KH560, and 50-80 parts xylene.

[0006] The adhesive layer is OCA optical adhesive.

[0007] The photoinitiator is one or more of benzoin dimethyl ether, diphenyl ethyl ketone and α-hydroxyalkyl phenyl ketone in any proportion.

[0008] The leveling agent is one or more of isophorone, diacetone alcohol and Solvesso 150 in any proportion.

[0009] The hydrophobic agent is one or more of hydrophobic agents DC84, DC88 and DC87 mixed in any proportion.

[0010] The modified epoxy acrylate resin is prepared by the following steps:

[0011] The pretreated epoxy acrylate resin, modifier, and toluene were mixed evenly and reacted at a speed of 150-200 r / min and a temperature of 90-95℃ for 3-4 hours. After cooling to 50-55℃, triethanolamine was added to neutralize to a pH of 6-7. Ferric chloride and pyrrole were then added, and the reaction was carried out at a temperature of 20-25℃ for 7-9 hours. Toluene was removed by distillation, the substrate was added to water, and the filtrate was removed by filtration to obtain the modified epoxy acrylate resin.

[0012] Furthermore, the molar ratio of the pretreated epoxy acrylate resin, modifier, ferric chloride, and pyrrole is 1:1:1.5:0.5.

[0013] Furthermore, the pretreated epoxy acrylate resin is prepared by the following steps:

[0014] Step A1: Diethylaminomethyldiethoxysilane was added to deionized water and stirred for 20-30 minutes at a speed of 200-300 r / min and a temperature of 25-30℃. Then, methylphenylboronic acid, tetrahydrofuran and concentrated sulfuric acid were added, the temperature was raised to 55-65℃ and kept at that temperature for 5-10 minutes. Then, 1,1,3,3-tetramethyldisiloxane was added and the reaction was carried out for 3-5 hours to obtain intermediate 1.

[0015] The reaction process is as follows:

[0016]

[0017] Step A2: Mix intermediate 1 and acrylic acid, stir and add caster catalyst at a speed of 200-300 r / min and a temperature of 50-60℃. After the addition is complete, raise the temperature to 60-65℃ and react for 3-4 h to obtain dicarboxylated polysiloxane. Dissolve dicarboxylated polysiloxane in xylene, add bromobutane, and react for 25-35 h. Remove xylene by distillation to obtain intermediate 2.

[0018] The reaction process is as follows:

[0019]

[0020] Step A3: Mix epoxy resin E-44, intermediate 2, triphenylphosphine and p-hydroxyanisole evenly, and react for 1-1.5 h at a rotation speed of 200-300 r / min and a temperature of 90-100℃. Add acrylic acid and continue the reaction for 1-1.5 h. Raise the temperature to 105-108℃ and continue the reaction for 3-5 h to obtain pretreated epoxy acrylic resin.

[0021] The reaction process is as follows:

[0022]

[0023] Furthermore, the molar ratio of diethylaminomethyldiethoxysilane, deionized water, methylphenylboronic acid and 1,1,3,3-tetramethyldisiloxane in step A1 is 1.5:10:1:0.5.

[0024] Furthermore, in step A2, the molar ratio of intermediate 1 to acrylic acid is 1:2, the amount of cassette catalyst is 0.01-0.02% of the total mass of intermediate 1 and acrylic acid, and the molar ratio of diethylamine group on dicarboxylated polysiloxane to bromobutane is 1:1.

[0025] Furthermore, in step A3, the molar ratio of epoxy resin E-44, intermediate 2, and acrylic acid is 1:0.1-0.15:0.1, the amount of triphenylphosphine is 5-10% of the total mass of epoxy resin E-44 and intermediate 2, and the amount of p-hydroxyanisole is 0.05-0.1% of the total mass of epoxy resin E-44 and intermediate 2.

[0026] Furthermore, the modifier is prepared by the following steps:

[0027] Step B1: Dissolve pyrrole in tetrahydrofuran, add potassium metal, and reflux at 70-75℃ for 5-7 hours. Then add p-toluenesulfonyl chloride and react at 200-300 r / min and 20-25℃ for 20-24 hours to obtain intermediate 3.

[0028] The reaction process is as follows:

[0029]

[0030] Step B2: Add aluminum trichloride to dichloromethane, stir at 150-200 r / min and 0-5℃, and add trimellitic anhydride acyl chloride and intermediate 3. React at 20-25℃ for 3-5 h to obtain intermediate 4. Mix intermediate 4, dioxane and sodium hydroxide solution evenly, and reflux at 105-110℃ for 6-8 h to obtain the modifier.

[0031] The reaction process is as follows:

[0032]

[0033] Furthermore, the molar ratio of pyrrole, potassium metal and p-toluenesulfonyl chloride in step B1 is 1:1.1:1.2.

[0034] Furthermore, in step B2, the molar ratio of aluminum trichloride, trimellitic anhydride acyl chloride, and intermediate 3 is 3:1.5:0.5, the volume ratio of intermediate 4 to sodium hydroxide solution is 0.01 mol:24 mL, and the mass fraction of sodium hydroxide solution is 20%.

[0035] The beneficial effects of this invention: The protective film for displays prepared by this invention includes, from top to bottom, an antifouling layer, a PET base layer, and an adhesive layer. The antifouling layer is made from an antifouling agent, which includes the following raw materials: modified epoxy acrylate resin, photoinitiator, leveling agent, hydrophobic agent, coupling agent KH560, and xylene. The modified epoxy acrylate resin is prepared by reacting pretreated epoxy acrylate resin and the modifier as raw materials. The pretreated epoxy acrylate resin is prepared by hydrolyzing diethylaminomethyldiethoxysilane as raw material, and then polymerizing it with 1,1,3,3-tetramethyldisiloxane to obtain intermediate 1. Intermediate 1 and acrylic acid are reacted under the action of a caster catalyst to obtain dicarboxylated polysiloxane. The dicarboxylated polysiloxane is reacted with bromobutane to obtain intermediate 2. Intermediate 2 is reacted with epoxy resin E-44 and end-capped with acrylic acid to form pretreated epoxy acrylate resin. The modifier is prepared by reacting pyrrole as raw material with potassium metal. Under the action of [unclear], it reacts with p-toluenesulfonyl chloride to obtain intermediate 3. Intermediate 3 and trimellitic anhydride acyl chloride react under the action of aluminum trichloride to obtain intermediate 4. Intermediate 4 is treated with sodium hydroxide solution to obtain intermediate 4. When the pretreated epoxy acrylate resin and the modifier react, the modifier undergoes ring-opening. The carboxyl group generated after ring-opening reacts with the hydroxyl group on the pretreated epoxy acrylate resin. Then, pyrrole is added and polymerizes with the pyrrole group of the modifier side chain to form polypyrrole, thus obtaining modified epoxy acrylate resin. The molecular chain of this modified epoxy acrylate resin contains organosilicon segments, which can reduce the surface free energy of the antifouling layer, thereby reducing the adsorption of dust on the protective film. At the same time, the quaternary ammonium salt structure of the main chain and the presence of polypyrrole side chains make it difficult for charges to accumulate on the surface of the antifouling layer, thereby avoiding the generation of static electricity and reducing the strength of electrostatic adsorption. This makes it difficult for dust to accumulate on the surface of the protective film, ensuring the aesthetics of the protective film. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] A protective film for a display includes, from top to bottom, an anti-fouling layer, a PET base layer, and an adhesive layer. The anti-fouling layer is made of an anti-fouling agent, which includes the following raw materials in parts by weight: 25 parts modified epoxy acrylic resin, 0.1 parts benzoin dimethyl ether, 1 part isophorone, 4 parts hydrophobic agent DC84, 0.5 parts coupling agent KH560, and 50 parts xylene.

[0039] The adhesive layer is OCA optical adhesive.

[0040] The protective film for this display is made by the following steps:

[0041] An antifouling agent is coated on one side of a PET substrate, dried, and cured under ultraviolet light to form an antifouling layer. OCA optical adhesive is coated on the other side of the PET substrate to obtain a protective film for displays.

[0042] The thickness of the antifouling layer is 10μm, the thickness of the PET base layer is 50μm, and the thickness of the adhesive layer is 5μm.

[0043] The modified epoxy acrylate resin is prepared by the following steps:

[0044] The pretreated epoxy acrylate resin, modifier, and toluene were mixed evenly and reacted at 150 r / min and 90℃ for 3 h. The mixture was then cooled to 50℃, and triethanolamine was added to neutralize the pH to 6. Ferric chloride and pyrrole were added, and the mixture was reacted at 20℃ for 7 h. Toluene was removed by distillation, the substrate was added to water, and the filtrate was removed by filtration to obtain the modified epoxy acrylate resin.

[0045] The molar ratio of the pretreated epoxy acrylate resin, modifier, ferric chloride and pyrrole is 1:1:1.5:0.5.

[0046] The pretreated epoxy acrylate resin is prepared by the following steps:

[0047] Step A1: Diethylaminomethyldiethoxysilane was added to deionized water and stirred for 20 min at 200 r / min and 25 °C. Then, methylphenylboronic acid, tetrahydrofuran and concentrated sulfuric acid were added, the temperature was raised to 55 °C and held for 5 min. Then, 1,1,3,3-tetramethyldisiloxane was added and the reaction was carried out for 3 h to obtain intermediate 1.

[0048] Step A2: Mix intermediate 1 and acrylic acid, stir and add caster catalyst at 200 r / min and 50 ℃, and after the addition is complete, heat to 60 ℃ and react for 3 h to obtain dicarboxylated polysiloxane. Dissolve dicarboxylated polysiloxane in xylene, add bromobutane, react for 25 h, remove xylene by distillation to obtain intermediate 2.

[0049] Step A3: Mix epoxy resin E-44, intermediate 2, triphenylphosphine and p-hydroxyanisole evenly, and react for 1 hour at a speed of 200 r / min and a temperature of 90℃. Add acrylic acid and continue the reaction for 1 hour. Raise the temperature to 105℃ and continue the reaction for 3 hours to obtain pretreated epoxy acrylic resin.

[0050] The molar ratio of diethylaminomethyldiethoxysilane, deionized water, methylphenylboronic acid and 1,1,3,3-tetramethyldisiloxane in step A1 is 1.5:10:1:0.5.

[0051] The molar ratio of intermediate 1 and acrylic acid in step A2 is 1:2, the amount of cassette catalyst is 0.01% of the total mass of intermediate 1 and acrylic acid, and the molar ratio of diethylamino group and bromobutane on dicarboxylated polysiloxane is 1:1.

[0052] The molar ratio of epoxy resin E-44, intermediate 2 and acrylic acid in step A3 is 1:0.1:0.1, the amount of triphenylphosphine is 5% of the total mass of epoxy resin E-44 and intermediate 2, and the amount of p-hydroxyanisole is 0.05% of the total mass of epoxy resin E-44 and intermediate 2.

[0053] The modifier is prepared by the following steps:

[0054] Step B1: Pyrrole was dissolved in tetrahydrofuran, potassium metal was added, and the mixture was refluxed at 70°C for 5 hours. Then p-toluenesulfonyl chloride was added, and the mixture was reacted at 200 r / min and 20°C for 20 hours to obtain intermediate 3.

[0055] Step B2: Add aluminum trichloride to dichloromethane, stir at 150 r / min and 0℃, and add trimellitic anhydride acyl chloride and intermediate 3. React at 20℃ for 3 h to obtain intermediate 4. Mix intermediate 4, dioxane and sodium hydroxide solution evenly, and reflux at 105℃ for 6 h to obtain the modifier.

[0056] The molar ratio of pyrrole, potassium metal and p-toluenesulfonyl chloride in step B1 is 1:1.1:1.2.

[0057] The molar ratio of aluminum trichloride, trimellitic anhydride acyl chloride and intermediate 3 in step B2 is 3:1.5:0.5, the volume ratio of intermediate 4 and sodium hydroxide solution is 0.01 mol:24 mL, and the mass fraction of sodium hydroxide solution is 20%.

[0058] Example 2

[0059] A protective film for a display includes, from top to bottom, an anti-fouling layer, a PET base layer, and an adhesive layer. The anti-fouling layer is composed of an anti-fouling agent comprising the following raw materials in parts by weight: 30 parts modified epoxy acrylate resin, 1 part diphenyl ethyl ketone, 1.5 parts diacetone alcohol, 5 parts hydrophobic agent DC88, 2 parts coupling agent KH560, and 65 parts xylene.

[0060] The adhesive layer is OCA optical adhesive.

[0061] The protective film for this display is made by the following steps:

[0062] An antifouling agent is coated on one side of a PET substrate, dried, and cured under ultraviolet light to form an antifouling layer. OCA optical adhesive is coated on the other side of the PET substrate to obtain a protective film for displays.

[0063] The thickness of the anti-fouling layer is 20μm, the thickness of the PET base layer is 80μm, and the thickness of the adhesive layer is 8μm.

[0064] The modified epoxy acrylate resin is prepared by the following steps:

[0065] The pretreated epoxy acrylate resin, modifier, and toluene were mixed evenly and reacted at 150 r / min and 95℃ for 3 h. The mixture was then cooled to 55℃, and triethanolamine was added to neutralize the pH to 6. Ferric chloride and pyrrole were added, and the mixture was reacted at 20℃ for 8 h. Toluene was removed by distillation, the substrate was added to water, and the filtrate was removed by filtration to obtain the modified epoxy acrylate resin.

[0066] The molar ratio of the pretreated epoxy acrylate resin, modifier, ferric chloride and pyrrole is 1:1:1.5:0.5.

[0067] The pretreated epoxy acrylate resin is prepared by the following steps:

[0068] Step A1: Diethylaminomethyldiethoxysilane was added to deionized water and stirred for 25 minutes at 200 r / min and 30°C. Then, methylphenylboronic acid, tetrahydrofuran and concentrated sulfuric acid were added, the temperature was raised to 60°C and held for 8 minutes. Then, 1,1,3,3-tetramethyldisiloxane was added and the reaction was carried out for 4 hours to obtain intermediate 1.

[0069] Step A2: Mix intermediate 1 and acrylic acid, stir and add caster catalyst at 200 r / min and 55 ℃. After the addition is complete, heat to 65 ℃ and react for 3.5 h to obtain dicarboxylated polysiloxane. Dissolve dicarboxylated polysiloxane in xylene, add bromobutane, react for 30 h, remove xylene by distillation to obtain intermediate 2.

[0070] Step A3: Mix epoxy resin E-44, intermediate 2, triphenylphosphine and p-hydroxyanisole evenly, and react for 1.5 h at a speed of 200 r / min and a temperature of 95 °C. Add acrylic acid and continue the reaction for 1.5 h. Raise the temperature to 105 °C and continue the reaction for 4 h to obtain pretreated epoxy acrylic resin.

[0071] The molar ratio of diethylaminomethyldiethoxysilane, deionized water, methylphenylboronic acid and 1,1,3,3-tetramethyldisiloxane in step A1 is 1.5:10:1:0.5.

[0072] The molar ratio of intermediate 1 and acrylic acid in step A2 is 1:2, the amount of cassette catalyst is 0.01% of the total mass of intermediate 1 and acrylic acid, and the molar ratio of diethylamino group and bromobutane on dicarboxylated polysiloxane is 1:1.

[0073] The molar ratio of epoxy resin E-44, intermediate 2 and acrylic acid in step A3 is 1:0.15:0.1, the amount of triphenylphosphine is 8% of the total mass of epoxy resin E-44 and intermediate 2, and the amount of p-hydroxyanisole is 0.1% of the total mass of epoxy resin E-44 and intermediate 2.

[0074] The modifier is prepared by the following steps:

[0075] Step B1: Pyrrole was dissolved in tetrahydrofuran, potassium metal was added, and the mixture was refluxed at 70°C for 6 hours. Then p-toluenesulfonyl chloride was added, and the mixture was reacted at 200 r / min and 25°C for 22 hours to obtain intermediate 3.

[0076] Step B2: Add aluminum trichloride to dichloromethane, stir at 200 r / min and 3°C, and add trimellitic anhydride acyl chloride and intermediate 3. React at 25°C for 4 h to obtain intermediate 4. Mix intermediate 4, dioxane and sodium hydroxide solution evenly, and reflux at 108°C for 7 h to obtain the modifier.

[0077] The molar ratio of pyrrole, potassium metal and p-toluenesulfonyl chloride in step B1 is 1:1.1:1.2.

[0078] The molar ratio of aluminum trichloride, trimellitic anhydride acyl chloride and intermediate 3 in step B2 is 3:1.5:0.5, the volume ratio of intermediate 4 and sodium hydroxide solution is 0.01 mol:24 mL, and the mass fraction of sodium hydroxide solution is 20%.

[0079] Example 3

[0080] A protective film for a display includes, from top to bottom, an anti-fouling layer, a PET base layer, and an adhesive layer. The anti-fouling layer is composed of an anti-fouling agent comprising the following raw materials in parts by weight: 35 parts modified epoxy acrylate resin, 2 parts α-hydroxyalkyl phenyl ketone, 2 parts Solvesso 150, 6 parts hydrophobic agent DC87, 4 parts coupling agent KH560, and 80 parts xylene.

[0081] The adhesive layer is OCA optical adhesive.

[0082] The thickness of the antifouling layer is 30μm, the thickness of the PET base layer is 100μm, and the thickness of the adhesive layer is 10μm.

[0083] The protective film for this display is made by the following steps:

[0084] An antifouling agent is coated on one side of a PET substrate, dried, and cured under ultraviolet light to form an antifouling layer. OCA optical adhesive is coated on the other side of the PET substrate to obtain a protective film for displays.

[0085] The modified epoxy acrylate resin is prepared by the following steps:

[0086] The pretreated epoxy acrylate resin, modifier, and toluene were mixed evenly and reacted at 200 r / min and 95℃ for 4 h. After cooling to 55℃, triethanolamine was added to neutralize to pH 7. Ferric chloride and pyrrole were added and reacted at 20℃ for 9 h. Toluene was removed by distillation, the substrate was added to water, and the filtrate was removed by filtration to obtain the modified epoxy acrylate resin.

[0087] The molar ratio of the pretreated epoxy acrylate resin, modifier, ferric chloride and pyrrole is 1:1:1.5:0.5.

[0088] The pretreated epoxy acrylate resin is prepared by the following steps:

[0089] Step A1: Diethylaminomethyldiethoxysilane was added to deionized water and stirred for 30 min at 300 r / min and 30 °C. Then, methylphenylboronic acid, tetrahydrofuran and concentrated sulfuric acid were added, the temperature was raised to 65 °C and kept at that temperature for 10 min. Then, 1,1,3,3-tetramethyldisiloxane was added and the reaction was carried out for 5 h to obtain intermediate 1.

[0090] Step A2: Mix intermediate 1 and acrylic acid, stir and add caster catalyst at 300 r / min and 60 ℃, and after the addition is complete, heat to 65 ℃ and react for 4 h to obtain dicarboxylated polysiloxane. Dissolve dicarboxylated polysiloxane in xylene, add bromobutane, react for 35 h, remove xylene by distillation to obtain intermediate 2.

[0091] Step A3: Mix epoxy resin E-44, intermediate 2, triphenylphosphine and p-hydroxyanisole evenly, and react for 1.5 h at a speed of 300 r / min and a temperature of 100 °C. Add acrylic acid and continue the reaction for 1.5 h. Raise the temperature to 108 °C and continue the reaction for 5 h to obtain pretreated epoxy acrylic resin.

[0092] The molar ratio of diethylaminomethyldiethoxysilane, deionized water, methylphenylboronic acid and 1,1,3,3-tetramethyldisiloxane in step A1 is 1.5:10:1:0.5.

[0093] The molar ratio of intermediate 1 to acrylic acid in step A2 is 1:2, the amount of cassette catalyst is 0.02% of the total mass of intermediate 1 and acrylic acid, and the molar ratio of diethylamino group on dicarboxylated polysiloxane to bromobutane is 1:1.

[0094] The molar ratio of epoxy resin E-44, intermediate 2 and acrylic acid in step A3 is 1:0.15:0.1, the amount of triphenylphosphine is 10% of the total mass of epoxy resin E-44 and intermediate 2, and the amount of p-hydroxyanisole is 0.1% of the total mass of epoxy resin E-44 and intermediate 2.

[0095] The modifier is prepared by the following steps:

[0096] Step B1: Pyrrole was dissolved in tetrahydrofuran, potassium metal was added, and the mixture was refluxed at 75°C for 7 hours. Then p-toluenesulfonyl chloride was added, and the mixture was reacted at 300 r / min and 25°C for 24 hours to obtain intermediate 3.

[0097] Step B2: Add aluminum trichloride to dichloromethane, stir at 200 r / min and 5°C, and add trimellitic anhydride acyl chloride and intermediate 3. React at 25°C for 5 h to obtain intermediate 4. Mix intermediate 4, dioxane and sodium hydroxide solution evenly, and reflux at 110°C for 8 h to obtain the modifier.

[0098] The molar ratio of pyrrole, potassium metal and p-toluenesulfonyl chloride in step B1 is 1:1.1:1.2.

[0099] The molar ratio of aluminum trichloride, trimellitic anhydride acyl chloride and intermediate 3 in step B2 is 3:1.5:0.5, the volume ratio of intermediate 4 and sodium hydroxide solution is 0.01 mol:24 mL, and the mass fraction of sodium hydroxide solution is 20%.

[0100] Comparative Example 1

[0101] Compared with Example 1, this comparative example uses pretreated epoxy acrylic resin instead of modified epoxy acrylic resin, while the other steps are the same.

[0102] Comparative Example 2

[0103] In this comparative example, Ebecryl 3701 epoxy acrylic resin was used instead of modified epoxy acrylic resin, and the remaining steps were the same.

[0104] The protective films prepared in Examples 1-3 and Comparative Examples 1-2 were pasted onto the monitor. Under the same environment, the monitor was turned on 20, 50, and 100 times, with each turn lasting 20 minutes. The dust adsorption on the surface of the protective film was observed, and the results are shown in the table below.

[0105]

[0106] As can be seen from the table above, the display protective films prepared in Examples 1-3 have excellent anti-fouling effects.

[0107] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A protective film for a display, characterized by: From top to bottom, it includes an antifouling layer, a PET base layer, and an adhesive layer. The antifouling layer comprises the following raw materials in parts by weight: 25-35 parts modified epoxy acrylic resin, 0.1-2 parts photoinitiator, 1-2 parts leveling agent, 4-6 parts hydrophobic agent, 0.5-4 parts coupling agent KH560, and 50-80 parts xylene. The adhesive layer is OCA optical adhesive; The modified epoxy acrylate resin is prepared by the following steps: After mixing and reacting pretreated epoxy acrylate resin, modifier and toluene, triethanolamine is added for neutralization, ferric chloride and pyrrole are added for reaction to obtain modified epoxy acrylate resin. The pretreated epoxy acrylate resin is prepared by the following steps: Step A1: Diethylaminomethyldiethoxysilane was added to deionized water and stirred. Then, methylphenylboronic acid, tetrahydrofuran and concentrated sulfuric acid were added. The mixture was heated and kept at a constant temperature. Then, 1,1,3,3-tetramethyldisiloxane was added to react and intermediate 1 was obtained. Step A2: Mix intermediate 1 and acrylic acid, stir and add caster catalyst. After the addition is complete, heat the reaction to obtain dicarboxylated polysiloxane. Dissolve dicarboxylated polysiloxane in xylene, add bromobutane, react, and remove xylene by distillation to obtain intermediate 2. Step A3: Mix epoxy resin E-44, intermediate 2, triphenylphosphine and p-hydroxyanisole and react them. Add acrylic acid, continue the reaction, and heat up to react again to obtain pretreated epoxy acrylic resin. The modifier is prepared by the following steps: Step B1: Dissolve pyrrole in tetrahydrofuran, add potassium metal, reflux the reaction, add p-toluenesulfonyl chloride, and react to obtain intermediate 3; Step B2: Add aluminum trichloride to dichloromethane, stir and add trimellitic anhydride acyl chloride and intermediate 3 to react and obtain intermediate 4. Mix intermediate 4, dioxane and sodium hydroxide solution evenly and reflux to obtain the modifier.

2. The protective film for a display according to claim 1, wherein: The molar ratio of the pretreated epoxy acrylate resin and the modifier is 1:

1.

3. The protective film for a display according to claim 1, wherein: The molar ratio of diethylaminomethyldiethoxysilane, deionized water, methylphenylboronic acid and 1,1,3,3-tetramethyldisiloxane in step A1 is 1.5:10:1:0.

5.

4. The protective film for a display according to claim 1, wherein: The molar ratio of intermediate 1 to acrylic acid in step A2 is 1:2, the amount of cassette catalyst is 0.01-0.02% of the total mass of intermediate 1 and acrylic acid, and the molar ratio of diethylamine group on dicarboxylated polysiloxane to bromobutane is 1:

1.

5. The protective film for a display according to claim 1, wherein: The molar ratio of epoxy resin E-44, intermediate 2 and acrylic acid in step A3 is 1:0.1-0.15:0.1, the amount of triphenylphosphine is 5-10% of the total mass of epoxy resin E-44 and intermediate 2, and the amount of p-hydroxyanisole is 0.05-0.1% of the total mass of epoxy resin E-44 and intermediate 2.

6. The protective film for a display according to claim 1, wherein: The molar ratio of pyrrole, potassium metal and p-toluenesulfonyl chloride in step B1 is 1:1.1:1.

2.

7. The protective film for a display according to claim 1, wherein: The molar ratio of aluminum trichloride, trimellitic anhydride acyl chloride and intermediate 3 in step B2 is 3:1.5:0.5, the volume ratio of intermediate 4 and sodium hydroxide solution is 0.01mol:24mL, and the mass fraction of sodium hydroxide solution is 20%.

8. The method for preparing a protective film for a display according to claim 1, characterized in that: Specifically, the steps include: applying an antifouling agent to one side of the PET substrate, drying and curing it under ultraviolet light to form an antifouling layer, and applying OCA optical adhesive to the other side of the PET substrate to obtain a protective film for displays.

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