A method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film

Abstract

The invention relates to the field of adhesive materials, and discloses a method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film. The pressure-sensitive adhesive protective film comprises a substrate and a photocurable mixture, wherein the photocurable mixture comprises an acrylate prepolymer, modified aluminum hydroxide, etc. The acrylate prepolymer comprises isooctyl acrylate, methyl methacrylate, acrylic acid, modified hydroxyethyl acrylate, isocyanoethyl acrylate, etc. The modified hydroxyethyl acrylate is prepared by grafting component one and hydroxyethyl acrylate with isophorone diisocyanate, and component one is prepared by reacting dibutyl phosphate and glycidyl neodecanoate; the modified aluminum hydroxide is prepared by grafting aluminum hydroxide after reacting octenyl succinic anhydride and 1,1,3,3-tetramethyldisiloxane. The invention provides the pressure-sensitive adhesive with excellent bonding, high temperature resistance and flame retardant properties by adding the acrylate prepolymer and the modified aluminum hydroxide, and the protective film has good high temperature aging resistance and wet heat aging resistance properties.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive materials, and in particular relates to a method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film. Background Art

[0002] Protective film is a kind of adhesive film mainly used on the surface of materials. It can protect materials from contamination during processing, manufacturing, transportation and storage, thereby retaining the original high brightness and cleanliness of the materials. The biggest advantage of protective film is that when the protective film is peeled off from the surface of the protected material, it will neither damage the protected material nor leave residual adhesive on the surface of the material. Acrylic pressure-sensitive adhesive has the advantages of low cost, simple synthesis process, excellent optical properties and bonding properties, and is widely used in the field of protective film.

[0003] Acrylic pressure-sensitive adhesives are classified into solvent-based pressure-sensitive adhesives, emulsion-based pressure-sensitive adhesives, hot-melt-based pressure-sensitive adhesives and UV-curable pressure-sensitive adhesives according to the synthesis process. As environmental pollution worsens, environmental protection laws become increasingly stringent, and environmental protection concepts are gradually gaining popularity. The development of pollution-free and environmentally friendly pressure-sensitive adhesives has also become a trend. UV-curable pressure-sensitive adhesives are cured by using acrylate prepolymers and photoinitiators under UV curing machine irradiation. They are widely used in the current market because of their simple operation, low energy consumption and low volatile organic compound emissions.

[0004] With the development of world industrialization, the use temperature of pressure-sensitive adhesives required in various fields is gradually increasing. High-temperature resistant pressure-sensitive adhesives play a very important role in daily necessities, electronics, construction, chemicals, medicine, automobiles, aerospace and other industries. However, the existing acrylic pressure-sensitive adhesives have poor high-temperature resistance and are prone to lose their adhesive properties at high temperatures, which largely restricts their scope of use. In addition, acrylic pressure-sensitive adhesives are extremely flammable, so they need to be modified to make them flame retardant. In order to achieve a good flame retardant effect, the existing technology generally needs to add a large amount of flame retardants to the polymer, but the addition of excessive fillers will cause the adhesive properties of the pressure-sensitive adhesive to drop rapidly, or even lose its adhesiveness, affecting the use of the pressure-sensitive adhesive. Summary of the invention

[0005] In order to solve the deficiencies mentioned in the above-mentioned background technology, the purpose of the present invention is to provide a method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film. By adding acrylate prepolymer and modified aluminum hydroxide, the pressure-sensitive adhesive is given excellent bonding performance, high temperature resistance and flame retardant properties, and the protective film has no residual adhesive after being peeled off under high temperature and hot and humid conditions, and has good high temperature aging resistance and hot and humid aging resistance.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An aging-resistant acrylic pressure-sensitive adhesive protective film comprises a substrate and a photocurable mixture coated on the surface of the substrate, wherein the photocurable mixture comprises the following raw materials in parts by weight: 80 to 100 parts of acrylate prepolymer, 4 to 7 parts of modified aluminum hydroxide, 10 to 20 parts of diluent monomer, and 2 to 8 parts of photoinitiator;

[0008] The acrylate prepolymer comprises the following raw materials in parts by weight: 70-95 parts of isooctyl acrylate, 5-15 parts of methyl methacrylate, 2-8 parts of acrylic acid, 5-10 parts of modified hydroxyethyl acrylate, 1-5 parts of isocyanoethyl acrylate, 0.5-1 part of p-hydroxyanisole, 1-5 parts of initiator, 4-8 parts of catalyst, and 80-100 parts of solvent;

[0009] The modified hydroxyethyl acrylate is prepared by grafting component one and hydroxyethyl acrylate with isophorone diisocyanate through a chemical reaction, wherein component one is prepared by a ring-opening reaction between dibutyl phosphate and glycidyl neodecanoate; the modified aluminum hydroxide is prepared by grafting aluminum hydroxide after a hydrosilylation reaction between octenyl succinic anhydride and 1,1,3,3-tetramethyldisiloxane.

[0010] Preferably, the substrate is one of PET film, PE film, and PVC film; the diluent monomer is one or more combinations of isobornyl acrylate, isooctyl acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate; and the photoinitiator is one or more combinations of photoinitiator TPO, photoinitiator 1173, photoinitiator 184, and photoinitiator 369.

[0011] Preferably, the initiator is one or a combination of azobisisobutyronitrile and benzoyl peroxide; the solvent is one or a combination of ethyl acetate, butyl acetate and toluene; and the catalyst is one or a combination of dibutyltin dilaurate and stannous octoate.

[0012] Preferably, the method for preparing the acrylate prepolymer comprises the following steps:

[0013] (1) dibutyl phosphate and glycidyl neodecanoate are placed in a reactor, triphenylphosphine is added, and the mixture is stirred at 80 to 90° C. for 4 to 6 hours to prepare component 1;

[0014] (2) isophorone diisocyanate and component 1 are placed in a reactor, stirred and mixed under a nitrogen atmosphere, and then dibutyltin dilaurate is added, and the mixture is stirred and reacted at 35 to 40° C. for 1 to 1.5 hours, and then hydroxyethyl acrylate is added, and the mixture is stirred and reacted at 40 to 50° C. for 1 to 2 hours to prepare modified hydroxyethyl acrylate;

[0015] (3) Take methyl methacrylate, acrylic acid, modified hydroxyethyl acrylate and isooctyl acrylate, mix them with the initiator respectively to obtain a mixed solution, add the solvent into the reactor under a nitrogen atmosphere, heat it to 72-76° C., add the mixed solution and keep it warm for 2-5 hours, then add the initiator, keep it warm for 3-5 hours, then heat it to 78-82° C., keep it warm for 1-2 hours, cool it to 55-65° C. after the heat preservation, add p-hydroxyanisole, catalyst and isocyanoethyl acrylate, keep it warm for 2-4 hours, and finally remove the solvent by rotary evaporation to prepare an acrylate prepolymer.

[0016] Preferably, in step (1), the mass ratio of dibutyl phosphate to glycidyl neodecanoate is 1:1.1-1.5.

[0017] Preferably, in step (2), the mass ratio of isophorone diisocyanate, component one and hydroxyethyl acrylate is 1:2-2.4:0.6-0.8.

[0018] Preferably, the preparation method of the modified aluminum hydroxide comprises the following steps:

[0019] A. Take octenyl succinic anhydride and an isopropanol solution containing chloroplatinic acid in a reactor, raise the temperature to 60-70° C., add 1,1,3,3-tetramethyldisiloxane and stir to react for 3-4 hours. After the reaction is completed, remove the unreacted product by rotary evaporation to prepare a modifier;

[0020] B. Ultrasonic dispersion of aluminum hydroxide in deionized water to obtain a suspension, dissolve the modifier in acetone and add it to the suspension, adjust the pH value of the system to 8-8.5, react at 30-45°C for 1-3h, and filter, wash and dry after the reaction to obtain modified aluminum hydroxide.

[0021] Preferably, in step A, the mass ratio of octenylsuccinic anhydride to 1,1,3,3-tetramethyldisiloxane is 3.1-3.7:1.

[0022] Preferably, in step B, the mass ratio of aluminum hydroxide to modifier is 1:0.2-0.8.

[0023] The method for preparing the above-mentioned aging-resistant acrylic pressure-sensitive adhesive protective film comprises the following steps:

[0024] S1, taking parts by weight of acrylate prepolymer and photoinitiator and stirring and mixing for 10 to 20 minutes, then adding parts by weight of dilution monomer and modified aluminum hydroxide, and continuing to stir and mix for 5 to 7 hours to prepare a photocurable mixture;

[0025] S2. Apply the photocurable mixture on the surface of the substrate with a coater, and then place it under an ultraviolet lamp for irradiation and curing to prepare an aging-resistant acrylic pressure-sensitive adhesive protective film.

[0026] Beneficial effects of the present invention:

[0027] The invention utilizes the hydroxyl group in the dibutyl phosphate structure and the epoxy group in the neodecanoic acid glycidyl ester structure to undergo a ring-opening reaction to prepare component one, and then the newly formed hydroxyl group in the component one structure and the hydroxyl group in the hydroxyethyl acrylate structure are respectively grafted with two isocyanate groups in the isophorone diisocyanate structure to prepare modified hydroxyethyl acrylate, wherein the introduced phosphorus element and tertiary carbonic acid hydrophobic group improve the flame retardant property and water resistance of the pressure-sensitive adhesive, and then isooctyl acrylate, methyl methacrylate, acrylic acid and modified hydroxyethyl acrylate are used as copolymer monomers, and an acrylate polymer is synthesized through a free radical polymerization reaction under the action of an initiator, and then an isocyanoethyl acrylate monomer is grafted to prepare an acrylate prepolymer, which gives the pressure-sensitive adhesive excellent bonding performance, and the urethane segment generated in the synthesis process of the modified hydroxyethyl acrylate improves the polarity of the acrylate prepolymer, thereby making it easier for the pressure-sensitive adhesive to wet the substrate and improving the initial adhesion of the pressure-sensitive adhesive.

[0028] The invention utilizes octenyl succinic anhydride and 1,1,3,3-tetramethyldisiloxane to undergo a silylation reaction under the action of a chloroplatinic acid catalyst to prepare a modifier, and then an acid anhydride group in the modifier structure is grafted with a hydroxyl group on the surface of aluminum hydroxide to prepare modified aluminum hydroxide, wherein the introduced hydrophobic alkyl long chain can improve the water resistance of the pressure-sensitive adhesive, the introduced Si-O-Si bond has a large molecular volume, low intermolecular interaction, small surface energy and good thermal stability, and the heat-resistant silicon oxide generated by pyrolysis can be combined with the phosphorus element in the modified hydroxyethyl acrylate to improve the carbonization amount and carbon layer barrier effect of the pressure-sensitive adhesive matrix, and the silicon oxide is used to modify the aluminum hydroxide, so that the aluminum hydroxide and the modifier are combined through a strong chemical bond, which is beneficial to the dispersion of the aluminum hydroxide, and can greatly improve the flame retardant performance of the pressure-sensitive adhesive, reduce the amount of the flame retardant, and reduce the influence on the bonding performance of the pressure-sensitive adhesive. In addition, the addition of the modified aluminum hydroxide can improve the bonding performance of the pressure-sensitive adhesive at high temperature and the high temperature aging resistance and wet heat aging resistance. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1 An acrylate prepolymer comprises the following raw materials in parts by weight:

[0031] 75 parts of isooctyl acrylate, 5 parts of methyl methacrylate, 2 parts of acrylic acid, 5 parts of modified hydroxyethyl acrylate, 2 parts of isocyanoethyl acrylate, 0.5 parts of p-hydroxyanisole, 2 parts of azobisisobutyronitrile as initiator, 4 parts of dibutyltin dilaurate as catalyst, and 85 parts of ethyl acetate as solvent;

[0032] The preparation method of the above-mentioned acrylate prepolymer comprises the following steps: taking methyl methacrylate, acrylic acid, modified hydroxyethyl acrylate and isooctyl acrylate, respectively mixing them with an initiator to obtain a mixed solution, adding a solvent into a reactor under a nitrogen atmosphere, heating the temperature to 74°C, adding the mixed solution and keeping it warm for 3 hours, then adding an initiator, keeping it warm for 4 hours, then heating the temperature to 80°C, keeping it warm for 2 hours, cooling the temperature to 60°C after the insulation is completed, adding p-hydroxyanisole, a catalyst and isocyanoethyl acrylate, continuing to keep it warm for 4 hours, and finally removing the solvent by rotary evaporation to prepare the acrylate prepolymer.

[0033] Wherein, the preparation method of modified hydroxyethyl acrylate comprises the following steps:

[0034] (1) 5.5 g of dibutyl phosphate and 6.5 g of neodecanoic acid glycidyl ester were placed in a reactor, 0.06 g of triphenylphosphine was added, and the mixture was stirred at 85° C. for 6 h to prepare component 1;

[0035] (2) 5 g of isophorone diisocyanate and 10.2 g of component 1 were placed in a reactor and stirred under a nitrogen atmosphere. Then, 0.015 g of dibutyltin dilaurate was added and stirred for reaction at 40° C. for 1 h. Subsequently, 3.6 g of hydroxyethyl acrylate was added and stirred for reaction at 50° C. for 1 h to prepare modified hydroxyethyl acrylate.

[0036] Embodiment 2 A method for preparing modified aluminum hydroxide comprises the following steps:

[0037] A. Take 6.7 g of octenyl succinic anhydride and 17.5 mL of an isopropanol solution containing 0.14 g of chloroplatinic acid in a reactor, heat to 70° C., add 2 g of 1,1,3,3-tetramethyldisiloxane and stir to react for 4 h. After the reaction is completed, remove the unreacted product by rotary evaporation to prepare a modifier;

[0038] B. Take 5g of aluminum hydroxide and ultrasonically disperse it in 120mL of deionized water to obtain a suspension. Take 2.8g of the modifier and add it to 15mL of acetone to dissolve it and then add it to the suspension. Adjust the pH value of the system to 8.5, place it at 45°C to react for 2h. After the reaction is completed, filter, wash and dry it to prepare modified aluminum hydroxide.

[0039] Example 3 A photocurable mixture comprises the following raw materials in parts by weight: 88 parts of the acrylate prepolymer prepared in Example 1, 4 parts of the modified aluminum hydroxide prepared in Example 2, 12 parts of diluent monomer isooctyl acrylate, and 184 3 parts of a photoinitiator;

[0040] A method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film comprises the following steps:

[0041] S1, taking parts by weight of acrylate prepolymer and photoinitiator, stirring and mixing for 10 minutes, then adding parts by weight of dilution monomer and modified aluminum hydroxide, and continuing to stir and mix for 6 hours to prepare a photocurable mixture;

[0042] S2. Apply the photocurable mixture on the surface of the PET film with a coater, and then place it under an ultraviolet lamp for irradiation and curing to prepare an aging-resistant acrylic pressure-sensitive adhesive protective film.

[0043] Example 4 A photocurable mixture comprises the following raw materials in parts by weight: 93 parts of the acrylate prepolymer prepared in Example 1, 5 parts of the modified aluminum hydroxide prepared in Example 2, 15 parts of the diluent monomer 1,6-hexanediol diacrylate, and 5 parts of a photoinitiator 1173;

[0044] The preparation method of an aging-resistant acrylic pressure-sensitive adhesive protective film is the same as that of Example 3.

[0045] Example 5 A photocurable mixture comprises the following raw materials in parts by weight: 100 parts of the acrylate prepolymer prepared in Example 1, 7 parts of the modified aluminum hydroxide prepared in Example 2, 18 parts of the diluent monomer isobornyl acrylate, and 7 parts of the photoinitiator TPO;

[0046] The preparation method of an aging-resistant acrylic pressure-sensitive adhesive protective film is the same as that of Example 3.

[0047] Comparative Example 1 An acrylate prepolymer comprises the following raw materials in parts by weight:

[0048] 75 parts of isooctyl acrylate, 5 parts of methyl methacrylate, 2 parts of acrylic acid, 5 parts of hydroxyethyl acrylate, 2 parts of isocyanoethyl acrylate, 0.5 parts of p-hydroxyanisole, 2 parts of azobisisobutyronitrile as initiator, 4 parts of dibutyltin dilaurate as catalyst, and 85 parts of ethyl acetate as solvent;

[0049] The preparation method of the above acrylate prepolymer is the same as that in Example 1.

[0050] Comparative Example 2 A photocurable mixture comprises the following raw materials in parts by weight: 100 parts of the acrylate prepolymer prepared in Comparative Example 1, 7 parts of the modified aluminum hydroxide prepared in Example 2, 18 parts of the diluent monomer isobornyl acrylate, and 7 parts of the photoinitiator TPO;

[0051] The preparation method of an aging-resistant acrylic pressure-sensitive adhesive protective film is the same as that of Example 3.

[0052] Comparative Example 3 A photocurable mixture comprises the following raw materials in parts by weight: 100 parts of the acrylate prepolymer prepared in Example 1, 7 parts of aluminum hydroxide, 18 parts of diluent monomer isobornyl acrylate, and 7 parts of photoinitiator TPO;

[0053] The preparation method of an aging-resistant acrylic pressure-sensitive adhesive protective film is the same as that of Example 3.

[0054] Performance Testing

[0055] The acrylic pressure-sensitive adhesive protective films prepared in Examples 3-5 and Comparative Examples 2-3 were subjected to performance testing:

[0056] (1) Adhesion performance test: The initial adhesion test was carried out according to GB / T 4852-2002; the sustained adhesion test was carried out according to GB / T 4851-1998; and the 180° peel strength test was carried out according to GB / T 2792-2014. The data results are shown in Table 1.

[0057] (2) High temperature aging resistance test: The protective film was attached to a glass plate and placed in an oven at 100°C for 8 h. After being taken out, it was naturally cooled to room temperature. After peeling off, the surface was observed for residual glue and precipitation. The data results are shown in Table 1.

[0058] (3) Test of resistance to moisture and heat aging: The protective film was attached to a glass plate and placed in a constant temperature and humidity chamber at 80°C and 90% RH for 100 h. After being taken out, it was naturally cooled to room temperature. After peeling off, the surface was observed for residual glue and precipitation. The data results are shown in Table 1.

[0059] (4) Flame retardant performance test: A vertical combustion test is used to evaluate the flame retardant performance of the sample. If the sample is extinguished within ten seconds after the ignition is stopped and the dripping does not ignite the cotton wool, the flame retardant grade is V-0. If the sample is extinguished more than ten seconds after the ignition is stopped and the dripping does not ignite the cotton wool, the flame retardant grade is V-1. If the sample is extinguished more than ten seconds after the ignition is stopped and the dripping ignites the cotton wool, the flame retardant grade is V-2. If the sample does not extinguish, it has no flame retardant grade and is NR. The test sample size is 125 mm × 12.0 mm × 3.0 mm. The data results are shown in Table 1.

[0060] Table 1 Sample performance test results

[0061]

[0062] From the data results in Table 1, it can be seen that the pressure-sensitive adhesive prepared in Examples 3-5 of the present invention has excellent bonding performance, high temperature resistance and flame retardant performance, and there is no residual adhesive after the protective film is peeled off under high temperature and hot and humid conditions, and the high temperature aging resistance and hot and humid aging resistance performance are good. Among them, in Comparative Example 2, hydroxyethyl acrylate was not modified, and its measured initial adhesion, flame retardant performance and hot and humid aging resistance performance were lower than those of Examples 3-5. The reason is that phosphorus elements and tertiary carbonic acid hydrophobic groups were not introduced into the structure of hydroxyethyl acrylate, and the reaction did not generate carbamate polar segments. In Comparative Example 3, aluminum hydroxide was not modified, and its measured bonding performance at high temperature, flame retardant performance, high temperature aging resistance and hot and humid aging resistance performance were lower than those of Examples 3-5, indicating that the grafting of the modifier can improve the various properties of the pressure-sensitive adhesive protective film.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An aging-resistant acrylic pressure-sensitive adhesive protective film, characterized in that: It comprises a substrate and a photocurable mixture coated on the surface of the substrate, wherein the photocurable mixture comprises the following raw materials in parts by weight: 80 to 100 parts of acrylate prepolymer, 4 to 7 parts of modified aluminum hydroxide, 10 to 20 parts of diluent monomer, and 2 to 8 parts of photoinitiator; The acrylate prepolymer comprises the following raw materials in parts by weight: 70-95 parts of isooctyl acrylate, 5-15 parts of methyl methacrylate, 2-8 parts of acrylic acid, 5-10 parts of modified hydroxyethyl acrylate, 1-5 parts of isocyanoethyl acrylate, 0.5-1 part of p-hydroxyanisole, 1-5 parts of initiator, 4-8 parts of catalyst, and 80-100 parts of solvent; The modified hydroxyethyl acrylate is prepared by grafting component one and hydroxyethyl acrylate with isophorone diisocyanate through a chemical reaction, wherein component one is prepared by a ring-opening reaction between dibutyl phosphate and glycidyl neodecanoate; the modified aluminum hydroxide is prepared by grafting aluminum hydroxide after a hydrosilylation reaction between octenyl succinic anhydride and 1,1,3,3-tetramethyldisiloxane.

2. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 1, characterized in that: The substrate is one of PET film, PE film, and PVC film; the diluent monomer is one or more combinations of isobornyl acrylate, isooctyl acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate; the photoinitiator is one or more combinations of photoinitiator TPO, photoinitiator 1173, photoinitiator 184, and photoinitiator 369.

3. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 1, characterized in that: The initiator is one or a combination of azobisisobutyronitrile and benzoyl peroxide; the solvent is one or a combination of ethyl acetate, butyl acetate and toluene; the catalyst is one or a combination of dibutyltin dilaurate and stannous octoate.

4. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 1, characterized in that: The preparation method of the acrylate prepolymer comprises the following steps: (1) dibutyl phosphate and glycidyl neodecanoate are placed in a reactor, triphenylphosphine is added, and the mixture is stirred at 80 to 90° C. for 4 to 6 hours to prepare component 1; (2) isophorone diisocyanate and component 1 are placed in a reactor, stirred and mixed under a nitrogen atmosphere, and then dibutyltin dilaurate is added, and the mixture is stirred and reacted at 35 to 40° C. for 1 to 1.5 hours, and then hydroxyethyl acrylate is added, and the mixture is stirred and reacted at 40 to 50° C. for 1 to 2 hours to prepare modified hydroxyethyl acrylate; (3) Take methyl methacrylate, acrylic acid, modified hydroxyethyl acrylate and isooctyl acrylate, mix them with the initiator respectively to obtain a mixed solution, add the solvent into the reactor under a nitrogen atmosphere, heat it to 72-76° C., add the mixed solution and keep it warm for 2-5 hours, then add the initiator, keep it warm for 3-5 hours, then heat it to 78-82° C., keep it warm for 1-2 hours, cool it to 55-65° C. after the heat preservation, add p-hydroxyanisole, catalyst and isocyanoethyl acrylate, keep it warm for 2-4 hours, and finally remove the solvent by rotary evaporation to prepare an acrylate prepolymer.

5. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 4, characterized in that: In the step (1), the mass ratio of dibutyl phosphate to glycidyl neodecanoate is 1:1.1-1.

5.

6. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 4, characterized in that: In the step (2), the mass ratio of isophorone diisocyanate, component one and hydroxyethyl acrylate is 1:2-2.4:0.6-0.

8.

7. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 1, characterized in that: The preparation method of the modified aluminum hydroxide comprises the following steps: A. Take octenyl succinic anhydride and an isopropanol solution containing chloroplatinic acid in a reactor, raise the temperature to 60-70° C., add 1,1,3,3-tetramethyldisiloxane and stir to react for 3-4 hours. After the reaction is completed, remove the unreacted product by rotary evaporation to prepare a modifier; B. Ultrasonic dispersion of aluminum hydroxide in deionized water to obtain a suspension, dissolve the modifier in acetone and add it to the suspension, adjust the pH value of the system to 8-8.5, react at 30-45°C for 1-3h, and filter, wash and dry after the reaction to obtain modified aluminum hydroxide.

8. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 7, characterized in that: In the step A, the mass ratio of octenyl succinic anhydride to 1,1,3,3-tetramethyldisiloxane is 3.1-3.7:

1.

9. The aging-resistant acrylic pressure-sensitive adhesive protective film according to claim 7, characterized in that: The mass ratio of aluminum hydroxide to modifier in step B is 1:0.2-0.

8.

10. A method for preparing an aging-resistant acrylic pressure-sensitive adhesive protective film according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, taking parts by weight of acrylate prepolymer and photoinitiator and stirring and mixing for 10 to 20 minutes, then adding parts by weight of dilution monomer and modified aluminum hydroxide, and continuing to stir and mix for 5 to 7 hours to prepare a photocurable mixture; S2. Apply the photocurable mixture on the surface of the substrate with a coater, and then place it under an ultraviolet lamp for irradiation and curing to prepare an aging-resistant acrylic pressure-sensitive adhesive protective film.

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