High-temperature-resistant polyester protective film as well as preparation method and application thereof

Abstract

The invention relates to the technical field of film materials, in particular to a high-temperature-resistant polyester protective film as well as a preparation method and application thereof. The high-temperature-resistant polyester protective film comprises a polyester film layer, a pressure-sensitive adhesive layer and a release film layer, wherein the pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of high-temperature-resistant acrylate resin; 1.2 to 3.6 parts of a cross-linking agent; 80 to 160 parts of a solvent; the high-temperature-resistant acrylate resin comprises the following components in parts by weight: 2-6 parts of a high-temperature-resistant monomer; 0.5 to 2.5 parts of an internal plasticizing oligomer; 1-3 parts of a vinyl-containing amide monomer; 1.5 to 3.5 parts of a crosslinking monomer; and 86-96 parts of a main monomer. The internal plasticizing oligomer has a vinyl group, can be grafted to a main chain of a polymer, improves the flexibility of the polymer, reduces the peel strength of the pressure-sensitive adhesive, and can improve the shrinkage performance of the pressure-sensitive adhesive after high temperature; the vinyl-containing amide monomer can form an intermolecular hydrogen bond and has an effect of improving cohesion, so that the heat resistance of the polyester protective film is improved, and meanwhile, the polyester protective film has relatively high polarity and can increase the adhesive force between a pressure-sensitive adhesive and a base material.

Description

Technical Field

[0001] The invention relates to the technical field of film materials, and in particular to a high-temperature resistant polyester protective film, a preparation method and application thereof. Background Art

[0002] During the manufacturing process of the ITO conductive film used in LCD touch screens, a protective film needs to be attached to its surface to prevent contamination and scratches. Since it needs to be processed at high temperature during the manufacturing process, in order to better protect the product surface, the protective film is required to have good high temperature resistance and be easy to peel off after being processed at high temperature.

[0003] Although the prior art provides a protective film with low peel strength, such as Chinese patent CN202111056172.7, which discloses a high temperature resistant protective film, it can effectively protect the ITO conductive film or nano silver conductive film, has no residual glue after the high temperature process, does not reduce the dyne value of the conductive film, and has a small warpage. It mainly improves the shrinkage of the pressure-sensitive adhesive by long-chain alkyl acrylates, and improves the heat resistance by cross-linking epoxy and isocyanate composite curing agents. The improvement effect of improving the heat resistance of the adhesive layer only by using a composite curing agent will be very limited, and when there are higher temperature resistance requirements, it will not be able to meet the use. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention can be achieved through the following technical solutions:

[0005] A high-temperature resistant polyester protective film, comprising a polyester film layer, a pressure-sensitive adhesive layer coated on the polyester film, and a release film layer attached to the pressure-sensitive adhesive layer, wherein the raw materials for preparing the pressure-sensitive adhesive layer include, by weight: 100 parts of a high-temperature resistant acrylate resin; 1.2-3.6 parts of a cross-linking agent; 80-160 parts of a solvent; the high-temperature resistant acrylate resin includes, by weight: 2-6 parts of a high-temperature resistant monomer; 0.5-2.5 parts of an internal plasticizing oligomer; 1-3 parts of a vinyl amide monomer; 1.5-3.5 parts of a cross-linking monomer; and 86-96 parts of a main monomer.

[0006] Furthermore, the high temperature resistant monomer is at least one of dicyclopentenyl ethoxylated methacrylate, 3-phenoxybenzyl acrylate and o-phenylphenoxyethyl acrylate.

[0007] Furthermore, the internal plasticizing oligomer is at least one of poly(ethylene glycol) methacrylate, polyethylene glycol dimethacrylate and polyethylene glycol methyl ether methacrylate.

[0008] Furthermore, the vinyl amide-containing monomer includes at least one of N-vinyl caprolactam, N-vinyl formamide and acrylamide.

[0009] Furthermore, the cross-linking monomer is a mixture of an acrylic monomer and a hydroxy acrylate monomer, and the mass ratio of the acrylic monomer to the hydroxy acrylate is 1:(3-5); the acrylic monomer is at least one of methacrylic acid and acrylic acid, and the hydroxy acrylate monomer includes at least one of hydroxyethyl acrylate, hydroxypropyl acrylate and 4-hydroxybutyl acrylate.

[0010] Furthermore, the main monomer includes at least one of isooctyl acrylate, isodecyl acrylate, isononyl acrylate, butyl acrylate, and dodecyl methacrylate.

[0011] Furthermore, the cross-linking agent is a mixture of an epoxy cross-linking agent and an isocyanate cross-linking agent, and the mass ratio of the epoxy cross-linking agent to the isocyanate cross-linking agent is 1:(1-3); and the solvent is at least one of an ester solvent and a ketone solvent.

[0012] Furthermore, the polyester film layer is a uniaxially stretched polyethylene terephthalate film and a biaxially stretched polyethylene terephthalate film.

[0013] Furthermore, the release film layer is a silicone release film layer and a non-silicone release film layer.

[0014] The above-mentioned high temperature resistant polyester protective film is used as a protective material on optical components.

[0015] Beneficial effects of the present invention:

[0016] 1. The polyester protective film of the present invention comprises a polyester film layer, a pressure-sensitive adhesive layer and a release film layer, wherein the pressure-sensitive adhesive layer comprises an acrylate resin, a high temperature resistant monomer, an internal plasticizing oligomer, a vinyl amide monomer, a cross-linking monomer and a main monomer; the high temperature resistant monomer has a ring structure which can greatly improve the rigidity of the polymer and improve the high temperature resistance, and at the same time, the structure contains an ether bond, which reduces the steric hindrance effect of the ring structure and is conducive to the smooth progress of the polymerization reaction; the internal plasticizing oligomer has a vinyl group which can be grafted to the main chain of the polymer, improve the flexibility of the polymer, reduce the peel strength of the pressure-sensitive adhesive, and improve the shrinkage performance of the pressure-sensitive adhesive after high temperature; the vinyl amide monomer can form intermolecular hydrogen bonds, has the effect of improving cohesion, thereby improving the heat resistance of the polyester protective film, and at the same time has a large polarity, which can increase the adhesion between the pressure-sensitive adhesive and the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a preparation flow chart of the preparation method of the present invention.

[0019] Figure 2 It is a cross-sectional view of the high temperature resistant polyester protective film of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in 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.

[0021] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0022] A high temperature resistant polyester protective film comprises a polyester film layer, a pressure sensitive adhesive layer coated on the polyester film and a release film layer attached to the pressure sensitive adhesive, wherein the pressure sensitive adhesive layer comprises the following substances in parts by weight:

[0023] 100 parts of high temperature resistant acrylic resin;

[0024] 1.2-3.6 parts of cross-linking agent;

[0025] 80-160 parts of solvent;

[0026] The high temperature resistant acrylic resin is prepared by free radical copolymerization of various substances, and the various substances include, by weight:

[0027] 2-6 parts of high temperature resistant monomer

[0028] Internal plasticizer oligomer 0.5-2.5 parts

[0029] Contains 1-3 parts of vinyl amide monomer

[0030] 1.5-3.5 parts of cross-linking monomer;

[0031] The main monomer is 86-96 parts.

[0032] The high temperature resistant monomer includes one or more of dicyclopentenyl ethoxylated methacrylate, 3-phenoxybenzyl acrylate, and o-phenylphenoxyethyl acrylate. The high temperature resistant monomer has a ring structure, which can greatly improve the rigidity of the polymer and improve the high temperature resistance. At the same time, the structure contains ether bonds, which reduces the steric effect of the ring structure and is conducive to the smooth progress of the polymerization reaction. When the high temperature resistant monomer is less than 2 parts, residual glue will appear after peeling in the high temperature test; when the high temperature monomer is higher than 6 parts, the pressure sensitive adhesive cannot fit tightly to the object because it is too rigid, has poor flexibility, and has poor wetting effect.

[0033] The internal plasticizing oligomer includes one or more of poly(ethylene glycol) methacrylate, polyethylene glycol dimethacrylate, and polyethylene glycol methyl ether methacrylate in any weight ratio. The internal plasticizing oligomer has a vinyl group and can be grafted to the main chain of the polymer to improve the flexibility of the polymer, reduce the peel strength of the pressure-sensitive adhesive, and improve the shrinkage performance of the pressure-sensitive adhesive after high temperature. When the internal plasticizing oligomer is less than 0.5 parts, the flexibility and wetting performance of the pressure-sensitive adhesive are poor; when the amount of the internal plasticizing oligomer is higher than 2.5 parts, phase separation is likely to occur, making the color of the pressure-sensitive adhesive white. The poly(ethylene glycol) methacrylate includes the trade name P832403 of Shanghai MacLean Biochemical Technology Co., Ltd. and the product number 409529 of Merck Chemical Technology (Shanghai) Co., Ltd.; the polyethylene glycol dimethacrylate includes the trade name P909886 of Shanghai MacLean Biochemical Technology Co., Ltd. and the product number 409510 of Merck Chemical Technology (Shanghai) Co., Ltd.; the polyethylene glycol methyl ether methacrylate includes the trade name P816112 of Shanghai MacLean Biochemical Technology Co., Ltd. and the product number 447935 of Merck Chemical Technology (Shanghai) Co., Ltd.

[0034] The vinylamide monomer includes one of N-vinyl caprolactam, N-vinyl formamide, acrylamide or multiple monomers in any weight ratio. The vinylamide monomer can form intermolecular hydrogen bonds, which has the effect of improving cohesion, thereby improving the heat resistance of the polyester protective film. At the same time, it has a large polarity and can increase the adhesion between the pressure-sensitive adhesive and the substrate. When the amount of the vinylamide monomer is less than 1 part, the cohesion is low, the high temperature resistance is poor, it is easy to remain, and the adhesive force is easily destroyed; when the amount of the vinylamide monomer is higher than 3, the polarity of the N-acrylate monomer is large, and it is easy to self-polymerize during polymerization, resulting in phase separation.

[0035] The cross-linking monomer mainly provides active groups, which can react with the cross-linking agent to form a three-dimensional network structure of linear polymer molecules and improve the cohesion of the pressure-sensitive adhesive. When the cross-linking monomer is less than 1.5 parts, there are few cross-linkable active groups, low cross-linking density, and poor high temperature resistance; when the cross-linking monomer is more than 3.5 parts, there are many cross-linking active groups, high cross-linking density, high rigidity of the pressure-sensitive adhesive, reduced wettability, and excessive viscosity during polymerization, making the reaction process difficult to control.

[0036] The cross-linking monomer includes two combinations of acrylic monomers and hydroxy acrylate monomers. The weight ratio of the acrylic monomer to the hydroxy acrylate is 1: (3-5). The acrylic monomer and the hydroxy acrylate monomer contain two active cross-linking points, carboxyl and hydroxyl, respectively. The acrylic monomer can react with an epoxy cross-linking agent to significantly improve the high temperature resistance. The hydroxy acrylate monomer can react with an isocyanate cross-linking agent to increase the high temperature resistance. When the weight ratio of the acrylic monomer to the hydroxy acrylate is higher than 1:3, the peel strength will increase significantly, and the pressure-sensitive adhesive has a high ester content, which may affect the surface of the adhered object; when the weight ratio of the acrylic monomer to the hydroxy acrylate monomer is lower than 1:5, the heat resistance will deteriorate, and the adhesive strength of the pressure-sensitive adhesive will be easily destroyed after high-temperature peeling.

[0037] The acrylic monomer includes one of methacrylic acid and acrylic acid or a combination of any two of them in a weight ratio. The hydroxyl-containing acrylic ester monomer includes one of hydroxyethyl acrylate, hydroxypropyl acrylate, and 4-hydroxybutyl acrylate in any weight ratio or a combination of any two of them in any weight ratio.

[0038] The main monomer includes one or more of isooctyl acrylate, isodecyl acrylate, isononyl acrylate, butyl acrylate, and dodecyl methacrylate in any weight ratio. The main monomer constitutes the main body of the polymer and gives the polymer pressure sensitivity. When the main monomer is less than 86 parts, the pressure-sensitive adhesive has poor pressure-sensitive properties, is not easy to adhere to the adhered object, and is not easy to form a film; when the main monomer is more than 96 parts, the cohesive force of the pressure-sensitive adhesive is insufficient and the overall performance is poor.

[0039] When the cross-linking agent is less than 1.2 parts, the cross-linking density is low and the high temperature resistance is poor. When the cross-linking agent is higher than 3.6, the flexibility and wettability of the pressure-sensitive adhesive layer are poor, and the adhesive force between the adhesive layer and the substrate decreases significantly. The cross-linking agent includes an isoepoxy cross-linking agent and an isocyanate cross-linking agent, and the weight ratio of the epoxy cross-linking agent to the isocyanate cross-linking agent is 1: (1-3). When the weight ratio of the epoxy cross-linking agent and the isocyanate cross-linking agent is higher than 1: 1, the epoxy cross-linking agent accounts for a large proportion. Although the pressure-sensitive adhesive has good high temperature resistance, it has poor flexibility, resulting in poor wettability; when the weight ratio of the epoxy cross-linking agent and the isocyanate cross-linking agent is lower than 1: 3, the high temperature resistance of the pressure-sensitive adhesive layer decreases. The epoxy cross-linking agent is L-70 of Huzhou Lutian New Materials Co., Ltd. and EC-98 of Shanghai Huixin Chemical Co., Ltd.; the isocyanate cross-linking agent includes HT-100 of Wanhua Chemical Group Co., Ltd. and N3300 of Covestro.

[0040] The solvent includes one of ester solvents and ketone solvents or multiple solvents in any weight ratio. The ester solvent includes ethyl acetate or butyl acetate; the ketone solvent includes butanone, acetone or cyclohexanone.

[0041] Example 1

[0042] 3 parts of dicyclopentenyl ethoxylated methacrylate, 1 part of o-phenylphenoxyethyl acrylate, 0.5 parts of polyethylene glycol dimethacrylate, 1 part of polyethylene glycol methyl ether methacrylate, 0.5 parts of N-vinyl caprolactam, 1.5 parts of N-vinyl formamide, 0.2 parts of methacrylic acid, 0.3 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate, 1 part of hydroxypropyl acrylate, 0.5 parts of 4-hydroxybutyl acrylate, 40 parts of isooctyl acrylate, 30 parts of isodecyl acrylate, 10 parts of isononyl acrylate and 11.5 parts of butyl acrylate were added into a reactor, and free radical thermal polymerization was carried out by a known method to obtain a high temperature resistant acrylic resin.

[0043] The high temperature resistant acrylic resin is calculated as 100 parts, and 0.8 parts of L-70, 1 part of HT-100, 0.6 parts of N3300, 60 parts of ethyl acetate, and 60 parts of butanone are added respectively, and mixed evenly to obtain a pressure-sensitive adhesive coating liquid, which is coated on the surface of the polyester film, and after drying, a release film is attached to the pressure-sensitive adhesive layer to obtain a high temperature resistant polyester protective film. The performance test results are shown in Table 1.

[0044] Example 2

[0045] Add 2 parts of dicyclopentenyl ethoxylated methacrylate, 3 parts of 3-phenoxybenzyl acrylate, 1 part of o-phenylphenoxyethyl acrylate, 1 part of a polymer including poly(ethylene glycol) methacrylate, 1.5 parts of polyethylene glycol dimethacrylate, 1 part of N-vinyl caprolactam, 1 part of N-vinyl formamide, 1 part of acrylamide, 0.875 parts of methacrylic acid, 0.625 parts of hydroxyethyl acrylate, 2 parts of 4-hydroxybutyl acrylate, 50 parts of isooctyl acrylate, 20 parts of butyl acrylate, and 16 parts of dodecyl methacrylate into a reaction kettle, and perform free radical thermal polymerization by a known method to obtain a high temperature resistant acrylic resin.

[0046] Calculated as 100 parts of high temperature resistant acrylic resin, 0.6 parts of EC-98, 0.6 parts of HT-100, and 160 parts of ethyl acetate were added respectively, and mixed evenly to obtain a pressure sensitive adhesive coating liquid, which was coated on the surface of the polyester film, and after drying, a release film was attached to the pressure sensitive adhesive layer to obtain a high temperature resistant polyester protective film. The performance test results are shown in Table 1.

[0047] Example 3

[0048] 2 parts of dicyclopentenyl ethoxylated methacrylate, 0.5 parts of polyethylene glycol methyl ether methacrylate, 1.5 parts of N-vinyl formamide, 0.13 parts of methacrylic acid, 0.2 parts of acrylic acid, 0.67 parts of hydroxyethyl acrylate, 0.5 parts of hydroxypropyl acrylate, 45 parts of isooctyl acrylate, 25 parts of isodecyl acrylate, 15 parts of isononyl acrylate, 6 parts of butyl acrylate and 5 parts of dodecyl methacrylate were added into a reactor, and free radical thermal polymerization was carried out by a known method to obtain a high temperature resistant acrylic resin.

[0049] Calculate 100 parts of high temperature resistant acrylic resin, add 0.3 parts of L-70, 0.6 parts of EC-98, 1.2 parts of HT-100, 1.5 parts of N3300, 20 parts of ethyl acetate, 30 parts of butyl acetate, and 30 parts of cyclohexanone, mix them evenly to obtain a pressure-sensitive adhesive coating liquid, apply the coating liquid on the surface of the polyester film, and after drying, attach a release film to the pressure-sensitive adhesive layer to obtain a high temperature resistant polyester protective film. The performance test results are shown in Table 1.

[0050] Example 4

[0051] 2 parts of 3-phenoxybenzyl acrylate, 3 parts of o-phenylphenoxyethyl acrylate, 0.5 parts of poly(ethylene glycol) methacrylate, 0.5 parts of polyethylene glycol dimethacrylate, 0.5 parts of polyethylene glycol methyl ether methacrylate, 1 part of N-vinyl formamide, 1.5 parts of acrylamide, 0.5 parts of acrylic acid, 2.5 parts of hydroxypropyl acrylate and 88.5 parts of isooctyl acrylate were added into a reaction kettle, and free radical thermal polymerization was carried out by a known method to obtain a high temperature resistant acrylic resin.

[0052] Calculated as 100 parts of high temperature resistant acrylic resin, 0.72 parts of EC-98, 0.54 parts of HT-100, 0.54 parts of N3300, 40 parts of ethyl acetate, 10 parts of butyl acetate, 20 parts of butanone, 20 parts of cyclohexanone, and 10 parts of acetone were added respectively, and mixed evenly to obtain a pressure-sensitive adhesive coating liquid, which was coated on the surface of the polyester film, and after drying, a release film was attached to the pressure-sensitive adhesive layer to obtain a high temperature resistant polyester protective film. The performance test results are shown in Table 1.

[0053] Example 5

[0054] 1 part of dicyclopentenyl ethoxylated methacrylate, 2 parts of 3-phenoxybenzyl acrylate, 1 part of a polymer including poly(ethylene glycol) methacrylate, 0.5 parts of polyethylene glycol dimethacrylate, 0.5 parts of polyethylene glycol methyl ether methacrylate, 0.5 parts of N-vinyl caprolactam, 0.5 parts of acrylamide, 0.36 parts of acrylic acid, 0.82 parts of hydroxypropyl acrylate, 0.82 parts of 4-hydroxybutyl acrylate, 70 parts of isooctyl acrylate, and 23.5 parts of isononyl acrylate were added into a reaction kettle, and free radical thermal polymerization was carried out by a known method to obtain a high temperature resistant acrylic resin.

[0055] Calculated as 100 parts of high temperature resistant acrylic resin, 0.86 parts of L-70, 2.14 parts of N3300, 70 parts of ethyl acetate, 30 parts of butanone, 15 parts of cyclohexanone, and 25 parts of acetone were added respectively, and mixed evenly to obtain a pressure-sensitive adhesive coating liquid, which was coated on the surface of the polyester film, and after drying, a release film was attached to the pressure-sensitive adhesive layer to obtain a high temperature resistant polyester protective film. The performance test results are shown in Table 1.

[0056] Comparative Example 1

[0057] No heat-resistant monomer was added, and other conditions were the same as in Example 1. The performance test results are shown in Table 1.

[0058] Comparative Example 2

[0059] The internal plasticizer oligomer was replaced with 3.4 parts of polyethylene glycol-600 (Green Union (Jining) Chemical Technology Co., Ltd.), and other conditions were the same as in Example 1. The performance test results are shown in Table 1.

[0060] Comparative Example 3

[0061] No vinylamide-containing monomer was added, and other conditions were the same as in Example 1. The performance test results are shown in Table 1.

[0062] Comparative Example 4

[0063] Commercially available acrylic pressure-sensitive adhesive PSA-1321 (Boncuring Science) was used, and other conditions were the same as those in Example 1. The performance test results are shown in Table 1.

[0064] The performance test methods in Table 1 are as follows:

[0065] High temperature resistance test

[0066] S1: Prepare the test sample according to GB / T 2790-1998 standard. The object to be attached is ITO protective film. Place the prepared sample in a strong convection drying oven (model: Binder FD-15) at 180°C for 30 minutes.

[0067] S2, after the high temperature test, the sample was left to cool naturally for 2 hours, and a peel strength test was performed using an electronic universal testing machine (model: AGS-X) at a peel angle of 180° and a tensile speed of 300 mm / min.

[0068] S3, after the test is completed, observe whether there is any residue on the surface of the ITO film by three wavelengths, and record the peel strength data.

[0069] Table 1 Performance test results of polyester protective films prepared in Examples 1-5 and Comparative Examples 1-4

[0070]

[0071]

[0072] Compared with Example 1, Comparative Example 1 does not add a high temperature resistant monomer, and is prone to residue in the high temperature resistance test. Example 1 adds a high temperature resistant monomer, utilizes a ring structure, has high rigidity and good heat resistance, and contains an ether bond in the structure to reduce the steric effect of the ring structure, so that the structure has a certain flexibility, and after copolymerization with other copolymers, the high temperature resistance is significantly improved.

[0073] Compared with Example 1, Comparative Example 2 adds polyethylene glycol 400, which is easily precipitated in the high temperature resistance test. Example 1 adds an internal plasticizing oligomer, and the oligomer has a vinyl group on its molecular chain, which can be copolymerized to the main chain of the acrylate resin, has an internal plasticizing effect, can effectively improve the flexibility of the pressure-sensitive adhesive, can reduce the peel strength of the pressure-sensitive adhesive and improve the wetting performance.

[0074] Compared with Example 1, Comparative Example 3 did not add vinylamide monomers, the cohesion of the pressure-sensitive adhesive was poor, and residues appeared in the heat resistance test. Example 1 added vinylamide monomers, which improved the cohesion of polymer molecules. Vinylamide monomers have strong polarity and high glass transition temperature. The amino groups on the molecules can form intermolecular hydrogen bonds, and the vinyl groups on the molecules participate in copolymerization to form physical crosslinking points, improve polymer cohesion, and improve high temperature resistance.

[0075] Compared with Example 1, the commercially available PSA-1321 acrylic resin used in Comparative Example 4 has a qualified peel strength after high temperature in the test process, but has obvious residues. Compared with the present invention, the high temperature resistance is poor.

[0076] 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.

[0077] 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. A high temperature resistant polyester protective film, characterized in that: The high-temperature resistant polyester protective film includes a polyester film layer, a pressure-sensitive adhesive layer coated on the polyester film, and a release film layer attached to the pressure-sensitive adhesive layer, wherein the raw materials for preparing the pressure-sensitive adhesive layer include, by weight: 100 parts of high-temperature resistant acrylate resin; 1.2-3.6 parts of cross-linking agent; 80-160 parts of solvent; the high-temperature resistant acrylate resin includes, by weight: 2-6 parts of high-temperature resistant monomer; 0.5-2.5 parts of internal plasticizer oligomer; 1-3 parts of vinyl amide monomer; 1.5-3.5 parts of cross-linking monomer; and 86-96 parts of main monomer.

2. A high temperature resistant polyester protective film according to claim 1, characterized in that: The high temperature resistant monomer is at least one of dicyclopentenyl ethoxylated methacrylate, 3-phenoxybenzyl acrylate and o-phenylphenoxyethyl acrylate.

3. The high temperature resistant polyester protective film according to claim 1, characterized in that: The internal plasticizing oligomer is at least one of poly(ethylene glycol) methacrylate, polyethylene glycol dimethacrylate and polyethylene glycol methyl ether methacrylate.

4. The high temperature resistant polyester protective film according to claim 1, characterized in that: The vinyl amide-containing monomer includes at least one of N-vinyl caprolactam, N-vinyl formamide and acrylamide.

5. The high temperature resistant polyester protective film according to claim 1, characterized in that: The cross-linking monomer is a mixture of an acrylic monomer and a hydroxy acrylate monomer, and the mass ratio of the acrylic monomer to the hydroxy acrylate is 1:(3-5); the acrylic monomer is at least one of methacrylic acid and acrylic acid, and the hydroxy acrylate monomer includes at least one of hydroxyethyl acrylate, hydroxypropyl acrylate and 4-hydroxybutyl acrylate.

6. The high temperature resistant polyester protective film according to claim 1, characterized in that: The main monomer includes at least one of isooctyl acrylate, isodecyl acrylate, isononyl acrylate, butyl acrylate, and dodecyl methacrylate.

7. The high temperature resistant polyester protective film according to claim 1, characterized in that: The cross-linking agent is a mixture of an epoxy cross-linking agent and an isocyanate cross-linking agent, and the mass ratio of the epoxy cross-linking agent to the isocyanate cross-linking agent is 1:(1-3); the solvent is at least one of an ester solvent and a ketone solvent.

8. The high temperature resistant polyester protective film according to claim 1, characterized in that: The polyester film layer is a uniaxially stretched polyethylene terephthalate film and a biaxially stretched polyethylene terephthalate film.

9. The high temperature resistant polyester protective film according to claim 1, characterized in that: The release film layer is a silicone release film layer and a non-silicone release film layer.

10. Use of the high temperature resistant polyester protective film as claimed in any one of claims 1 to 9 as a protective material on optical components.

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