CN107033799B

CN107033799B - Curved surface protective film with multiple functional layers and preparation method thereof

Info

Publication number: CN107033799B
Application number: CN201710124062.7A
Authority: CN
Inventors: 林凯
Original assignee: Dongguan Nali Optical Material Co Ltd
Current assignee: Dongguan Nali Optical Material Co Ltd
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2020-06-19
Anticipated expiration: 2037-03-03
Also published as: CN107033799A

Abstract

The invention discloses a curved surface protective film with multiple functional layers and a preparation method thereof, and the curved surface protective film has the effects of resisting dirt and fingerprints and is high in cleanliness. According to the invention, the UV hardening layer is introduced on the first base material, the film protection layer is arranged on the UV hardening layer, the silica gel layer is introduced under the second base material, the fluorine release film is arranged under the silica gel layer, the high-viscosity adhesive layer is introduced on the second base material, and the high-viscosity adhesive layer is attached to the other side of the first base material, which is far away from the UV hardening layer. The invention has the effect of blue light resistance and protects eyes; the use of a double layer of PET increases the layer thickness and thus increases the cushioning capacity.

Description

Curved surface protective film with multiple functional layers and preparation method thereof

Technical Field

The invention belongs to the field of protective film manufacturing, and particularly relates to the field of protection of a full-lamination protective film of a display screen with an arc edge or a curved surface.

Background

The protective film that can laminate arc limit or curved surface in market overall structure does not have great difference with conventional three-layer protection film, nevertheless for curved surface protection film, the thickness on UV sclerosis layer and silica gel layer for can influence the laminating effect, so must select suitable thickness for can strengthen preventing scraping nature, practice thrift manufacturing cost and obtain the laminating effect of preferred.

The technology provides a curved surface protective film with a plurality of functional layers of anti-pollution, anti-fingerprint and anti-blue light, which is structurally large and different, can solve the problem of wear resistance and can obtain a multifunctional protective film in the least cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides the protective film which can improve the surface hardness; the anti-pollution and anti-fingerprint effects are achieved, and the cleanliness is high; still possess anti blue light effect, effective filtration high energy shortwave blue light protects eyes.

In order to achieve the purpose, the invention adopts the following scheme:

a curved surface protective film with multiple functional layers is characterized in that a UV hardening layer is introduced on a first substrate, a protective film layer is arranged on the UV hardening layer, a silica gel layer is introduced below a second substrate, a fluorine release film is arranged below the silica gel layer, a high-viscosity adhesive layer is introduced on the second substrate, and the high-viscosity adhesive layer is attached to the other side, far away from the UV hardening layer, of the first substrate;

the thickness of the first substrate is 50-100 μm;

the thickness of the second substrate is 50-100 μm;

the thickness of the protective film layer is 50-100 μm;

the thickness of the fluorine release film is 50-100 mu m;

the thickness of the UV hardening layer is 3-7 mu m;

the thickness of the high-viscosity adhesive layer is 10-15 mu m;

the thickness of the silica gel layer is 20-50 μm;

the UV hardening layer comprises the following raw material components in parts by weight:

further, the solvent of the UV hardening layer is: one or a mixture of toluene, butanone and propylene glycol methyl ether acetate;

the crosslinking monomer is: one or a mixture of hexanediol diacrylate, NPGDA and TPGDA;

the prepolymer is: one or a mixture of epoxy acrylic resin, polyurethane acrylic resin and polyester acrylic resin;

the photoinitiator is: mixing benzophenone and triethanolamine according to the weight ratio of 2: 1;

the anti-fouling agent is: one or a mixture of a fluorine-containing compound and a modified acrylic acid copolymer;

the fluorine-containing compound is: one or a mixture of ethylene-tetrafluoroethylene copolymer (ETFE), Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), perfluoroalkoxy resin (PFA), Polychlorotrifluoroethylene (PCTFE), ethylene chlorotrifluoroethylene copolymer (ECTFE), polyvinylidene fluoride (PVDF) or polyvinyl fluoride;

the solvent is added in the preparation process, and the solvent is volatilized after the preparation.

Further, the silica gel layer comprises the following raw material components in parts by weight:

100 parts of organic silicon pressure-sensitive adhesive

5-20 parts of a blue light resistant agent;

the blue light resisting agent is: salicylate esters, benzophenones, benzotriazoles, substituted acrylonitriles, triazines or hindered amines and mixtures thereof.

Further, the high-viscosity adhesive layer comprises the following raw material components in parts by weight:

the adhesive monomers are: one or a mixture of butyl acrylate, ethyl acrylate and isooctyl acrylate;

the cohesive monomers are: one or a mixture of vinyl acetate and methyl methacrylate;

the modified monomer is as follows: one or a mixture of acrylic acid, methacrylic acid and hydroxyethyl methacrylate;

the cross-linking agent is: one or a mixture of isocyanate, benzoyl peroxide and anhydride;

the plasticizer is as follows: dibutyl phthalate (DBP), which improves the flexibility of the film and is stable to heat and light;

the anti-shrinkage agent is polyether modified siloxane, has excellent wetting and leveling properties, improves the surface tension of the coating, can effectively prevent shrinkage cavity from being generated during coating of the coating, and effectively improves the fullness of the coating;

50-100 parts of a solvent;

the solvent is as follows: one or a mixture of toluene and ethyl acetate;

A preparation method of a curved surface protective film with multiple functional layers comprises the following steps:

s1, taking PET with the thickness of 50-100 mu m as a first base material, mixing an anti-fingerprint agent and an anti-fouling agent in UV glue, uniformly coating the surface of the first base material with the mixed glue through micro-gravure coating, anilox roller or Slot-Die, wherein the coating thickness is 3-7 mu m, drying through an oven at 50-120 ℃, and illuminating for 300-550 mj/cm²Curing to form a UV hardening layer;

s2, coating a layer of 20-50 mu m mixture of organic silicon pressure-sensitive adhesive and anti-bluing agent by using PET with the thickness of 50-100 mu m as a second base material through a comma type scraper or a Slot-Die, and curing at 80-200 ℃ through an oven to form a silica gel layer; after the silica gel layer is finished, a fluorine release film is pasted on the silica gel layer, and the thickness of the fluorine release film is 50-100 micrometers;

s3, weighing the corresponding weight of the high-viscosity glue layer according to the raw material components, and adding the glue into a glue preparation barrel; weighing a solvent with corresponding weight in the preparation process, adding the solvent into a glue preparation barrel, stirring for 20-25 min, stopping stirring after fully stirring, uniformly coating the solvent on the other side of the second base material far away from the silica gel layer, coating a high-viscosity glue layer with the thickness of 10-15 mu m by a comma type scraper or Slot-Die, curing at 80-160 ℃ by an oven, passing through a laminating roller, and laminating the high-viscosity glue layer with the other side of the first base material far away from the UV hardening layer; the flexibility of the product can be increased through the high-viscosity adhesive layer, and the cambered surface is stable and does not warp;

s4, arranging a protective film layer on the UV hardening layer, wherein the thickness of the protective film layer is 50-100 mu m;

and S5, carrying out die cutting and hot pressing on the product through a die cutting and hot pressing machine, and heating for 2-6S at 260 ℃ by adopting a 2.5D arc edge die, wherein the forming working process is completed for 0.8-2S to obtain a finished product of the protective film.

The invention has the advantages that:

1. has the functions of hydrophobic, oleophobic, fingerprint resistance and stain resistance;

2. the blue light resisting effect is achieved, and eyes are protected;

3. the use of a double layer of PET increases the layer thickness and thus increases the cushioning capacity.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Description of reference numerals:

the adhesive comprises a first substrate 11, a second substrate 13, a protective film layer 16, a fluorine release film 18, a UV hardening layer 21, a high-viscosity adhesive layer 22 and a silica gel layer 24.

Detailed Description

In order to further understand the features and technical means of the present invention and achieve the specific objects and functions, the advantages and spirit of the present invention are further illustrated by the following embodiments.

The technical scheme of the invention is as follows:

s1, taking PET with the thickness of 50-100 mu m as a first base material 11, mixing an anti-fingerprint agent and an anti-fouling agent in UV glue, uniformly coating the surface of the first base material 11 with the mixed glue through micro-gravure coating, anilox roller or Slot-Die, wherein the coating thickness is 3-7 mu m, drying through an oven at 50-120 ℃, and illuminating at 300-550 mj/cm²Curing to form a UV hardening layer 21 with fingerprint and stain resistant effects, so that the friction coefficient of the film is reduced, the service life is prolonged, and oily dirty sweat can be easily wiped;

the UV hardening layer 21 (with the anti-fingerprint and anti-pollution functional layer) comprises the following raw material components in parts by weight:

the solvent is one or more of toluene, butanone and propylene glycol methyl ether acetate; the crosslinking monomer is one or more of hexanediol diacrylate, NPGDA and TPGDA; the prepolymer is one or more of epoxy acrylic resin, polyurethane acrylic resin and polyester acrylic resin; the photoinitiator is prepared by mixing benzophenone and triethanolamine according to a ratio of 2: 1;

the added fingerprint resisting agent is HY-6601 of Shenzhen Huayi science and technology Limited; the added anti-fouling agent is a fluorine-containing compound and a modified acrylic acid copolymer, wherein the fluorine-containing compound can be divided into: one or more of ethylene-tetrafluoroethylene copolymer (ETFE), Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), perfluoroalkoxy resin (PFA), Polychlorotrifluoroethylene (PCTFE), ethylene chlorotrifluoroethylene copolymer (ECTFE), polyvinylidene fluoride (PVDF) and polyvinyl fluoride;

s2, coating a 20-50 mu m silica gel layer 24 (with silicon pressure-sensitive adhesive) with a blue light resistant effect by using PET with a thickness of 50-100 mu m as a second base material 13 through a comma type scraper or Slot-Die, and curing at 80-200 ℃ through an oven to form the silica gel layer 24; the silica gel layer 24 can effectively exhaust air, is easy to attach and can be easily attached by non-professionals;

the second base material 13(PET film) is good in transparency and glossy; the air tightness and the fragrance retention are good; the moisture resistance is moderate, and the moisture permeability is reduced at low temperature; the mechanical property is excellent, the obdurability is the best of all thermoplastic plastics, and the tensile strength and the impact strength are much higher than those of common films; the light transmittance is more than 91%;

the silica gel layer 24 is prepared from organic silicon pressure-sensitive adhesive and an anti-bluing agent according to the proportion of 100 parts: 5-20 parts of the components are mixed, and the mixture is fully stirred for 3-5 min to uniformly mix the glue solution; wherein the blue light resisting agent is one or the combination of salicylic acid esters, benzophenones, benzotriazoles, substituted acrylonitrile, triazines and hindered amines;

after the silica gel layer 24 is finished, a layer of fluorine release film 18 is pasted on the silica gel layer 24, and the thickness of the fluorine release film 18 is 50-100 mu m;

s3, coating a 10-15 mu m high-viscosity adhesive layer 22 on the other side, far away from the silica gel layer 24 (the adhesive layer with the blue light resisting effect), of the second base material 13 through a comma type scraper or a Slot-Die, curing the adhesive layer at 80-160 ℃ through an oven, passing through a laminating roller, and laminating the high-viscosity adhesive layer 22 with the other side, far away from the UV hardened layer 21, of the first base material 11 to obtain the curved surface protective film with the multiple functional layers;

the high-viscosity glue layer 22 comprises the following raw materials in parts by weight: 50-60 parts of a viscous monomer, 5-15 parts of a cohesive monomer, 3-10 parts of a modified monomer, 0.1-1 part of a cross-linking agent, 0.01-1 part of a plasticizer, 0.2-1 part of an anti-shrinkage agent and 50-100 parts of a solvent; the viscous monomer is one or more of butyl acrylate, ethyl acrylate and isooctyl acrylate; the cohesive monomer is one or two of vinyl acetate and methyl methacrylate; the modified monomer is one or more of acrylic acid, methacrylic acid and hydroxyethyl methacrylate; the cross-linking agent is one of isocyanate, benzoyl peroxide and anhydride; the plasticizer is dibutyl phthalate (DBP), so that the flexibility of the film can be improved, and the film is stable to heat and light; the anti-shrinkage agent is polyether modified siloxane, has excellent wetting and leveling properties, improves the surface tension of the coating, can effectively prevent shrinkage cavity from being generated during coating of the coating, and effectively improves the fullness of the coating; the solvent is one or two of toluene and ethyl acetate;

s4, arranging a film protecting layer 16(PET) on the UV hardening layer 21, wherein the thickness of the film protecting layer is 50-100 mu m; the fluorine release film 18 is arranged on the silica gel layer 24 (blue light resistant adhesive layer), the thickness of the fluorine release film is 50-100 microns, the product is protected from being polluted, corroded and scratched in the using process, the original bright and clean surface is protected, and therefore the quality of the product is improved;

and S5, carrying out die cutting and hot pressing on the product according to the required size through a die cutting and hot pressing machine (2.5D arc edge die is adopted, the product is heated for 2-6S at 260 ℃, the forming working process is completed for 0.8-2S, and the product can deform if the heating time is too long), so as to obtain the curved surface protective film with multiple functional layers.

The present invention is further illustrated in detail below with reference to examples:

example one

S1: coating a first substrate 11(PET) with the thickness of 90 mu m by using an anilox roller, coating anti-fingerprint and anti-pollution UV glue (UV hardening layer 21), drying by using an oven at 90 ℃, and enabling the energy of a UV lamp to be 300-550 mj/cm²The coating thickness was 3 μm after curing. UV hardening layer 21 (with anti-finger)The pattern anti-fouling functional layer) comprises the following raw material components in parts by weight:

a zebra oil pen is adopted to draw a straight line on the UV surface (UV hardened layer 21) of the membrane, the phenomenon from the straight line of pen ink to the discontinuity can be detected to detect that the zebra oil pen has the hydrophobic and oleophobic anti-fouling function, and the discontinuity to the shape of formed water drops shows that the anti-fouling performance is better.

S2: another 85 μm thick second substrate 13(PET) was coated with silicone pressure sensitive adhesive and anti-bluing agent using a comma doctor blade according to 100 parts: 9 parts of glue mixed according to the proportion is coated to the thickness of 25 mu m, and the silica gel layer 24 is obtained after curing in an oven at 180 ℃. The organic silicon pressure-sensitive adhesive adopts one with higher silica gel viscosity, can well ensure the laminating effect of the protective film under the action of force, and is not easy to warp. After the silica gel layer 24 is finished, a layer of fluorine release film 18 is pasted on the silica gel layer 24 (blue light resistant adhesive layer), and the thickness of the fluorine release film 18 is 50 micrometers;

s3: on the other side of the second substrate 13 away from the silica gel layer 24 (the glue layer with blue light resistance), a 13 μm high-viscosity glue layer 22 is coated by a comma type scraper, and the raw material components and the weight ratio of the high-viscosity glue layer 22 are as follows: 50-60 parts of viscous monomer, 5-15 parts of cohesive monomer, 3-10 parts of modified monomer, 0.1-1 part of cross-linking agent, 0.05 part of plasticizer, 0.2 part of anti-shrinkage agent and 50-100 parts of solvent; and (3) after curing at 160 ℃ in an oven, passing through a laminating roller, and laminating the high-viscosity adhesive layer 22 and the other surface of the first substrate 11, which is far away from the UV hardening layer 21, to obtain the product. The test of a 'forest science and technology LS108 blue light prevention tester' shows that the product can shield 85% of short-wave blue light.

S4: a film protecting layer 16(PET) with a thickness of 50 μm is provided on the UV cured layer 21; the product is protected from being polluted, corroded and scratched in the using process, and the original bright and clean surface is protected, so that the quality of the product is improved.

S5: and (3) carrying out die cutting hot pressing on the product according to the required size through a die cutting hot pressing machine (a 2.5D arc edge die is adopted, the product is heated for 2-6 s at 260 ℃, the forming working stroke is completed for 0.8-2 s, and if the heating time is too long, the product can deform), so as to obtain the curved surface protective film with multiple functional layers.

The tensile force of the silica gel surface is 4gf/25 mm-6 gf/25mm, the peeling force is 25gf/25 mm-30 gf/25mm, and the transmittance and haze are respectively measured by a light transmittance and haze measuring instrument, namely 91.5 percent and 0.3 percent. Is a low-color protective film.

Example two

S1: coating a first substrate 11(PET) with the thickness of 100 mu m by using an anilox roller, coating anti-fingerprint and anti-pollution UV glue (UV hardening layer 21), drying by using an oven at 90 ℃, and enabling the energy of a UV lamp to be 300-550 mj/cm²The coating thickness was 4 μm after curing. Wherein the UV hardening layer 21 (with the anti-fingerprint and anti-pollution functional layer) comprises the following raw material components in parts by weight:

a zebra oil pen is adopted to draw a straight line on the surface of the UV hardening layer 21 of the membrane, the phenomenon from the straight line of pen ink to the discontinuity can be detected to detect that the zebra oil pen has hydrophobic, oleophobic and anti-fouling functions, and the discontinuity to the shape of formed water beads shows that the anti-fouling performance is better.

S2: and (3) coating organic silicon pressure-sensitive adhesive on another second base material 13(PET) with the thickness of 75 micrometers by using a comma type scraper, wherein the coating thickness is 30 micrometers, and curing the coated base material in an oven at the temperature of 180 ℃ to obtain the silica gel layer 24. The organic silicon pressure-sensitive adhesive adopts one with higher silica gel viscosity, can well ensure the laminating effect of the protective film under the action of force, and is not easy to warp.

S3: coating a 11-micrometer high-viscosity adhesive layer 22 on the other side of the second base material 13 far away from the silica gel layer 24 (the adhesive layer with the blue light resisting effect) through a comma type scraper, curing the adhesive layer at 160 ℃ through an oven, and laminating the high-viscosity adhesive layer 22 with the other side of the first base material 11 (far away from the UV hardening layer 21) to obtain the product. The test of a 'forest science and technology LS108 blue-ray prevention tester' shows that the product can shield 88% of short-wave blue light.

S4: arranging a PET film protection layer 16 on the UV hardening layer 21, wherein the thickness of the film protection layer 16 is 60 mu m; and the fluorine release film 18 with the thickness of 55 microns is arranged on the silica gel layer 24 (blue light resistant adhesive layer), so that the product is protected from being polluted, corroded and scratched in the using process, the original bright and clean surface is protected, and the quality of the product is improved.

S5: and carrying out die cutting and hot pressing on the product according to the required size through a die cutting and hot pressing machine (a 2.5D arc edge die is adopted, the product is heated for 2-6 s at 260 ℃, the forming working stroke is completed for 0.8-2 s, and if the heating time is too long, the product can deform), so as to obtain the curved surface protective film with the multiple functional layers.

The tensile force of the silica gel surface is 5gf/25 mm-8 gf/25mm, the peeling force is 25gf/25 mm-30 gf/25mm, the transmittance is more than or equal to 90 percent, and the haze is less than 1 percent. Is a low-color protective film.

EXAMPLE III

S1: coating a first substrate 11(PET) with the thickness of 100 mu m by using an anilox roller, coating anti-fingerprint and anti-pollution UV glue (UV hardening layer 21), drying by using an oven at 90 ℃, and enabling the energy of a UV lamp to be 300-550 mj/cm²Curing, and coating the coating with a thickness of 4-6 μm.

The UV hardening layer 21 (coating liquid with fingerprint and stain resistance) comprises the following raw material components in parts by weight:

S2: and (3) coating organic silicon pressure-sensitive adhesive on another second base material 13(PET) with the thickness of 90 mu m by using a comma type scraper, wherein the coating thickness is 25 mu m, and curing the mixture in an oven at the temperature of 180 ℃ to obtain the silica gel layer 24. The organic silicon pressure-sensitive adhesive adopts one with higher silica gel viscosity, can well ensure the laminating effect of the protective film under the action of force, and is not easy to warp.

S3: coating a 14-micrometer high-viscosity adhesive layer 22 on the other side of the second base material 13 far away from the silica gel layer 24 (the adhesive layer with the blue light resisting effect) through a comma type scraper, curing the adhesive layer at 160 ℃ through an oven, and laminating the high-viscosity adhesive layer 22 and the other side of the first base material 11 far away from the UV hardening layer 21 to obtain the product. The test of adopting "forest science and technology LS108 prevents blue light tester" shows that the product can shield 89% shortwave blue light.

S4: a film protecting layer 16(PET) with a thickness of 55 μm is provided on the UV hardening layer 21; and the fluorine release film 18 with the thickness of 70 mu m is arranged on the silica gel layer 24 (blue light resistant adhesive layer), so that the product is protected from being polluted, corroded and scratched in the using process, the original bright and clean surface is protected, and the quality of the product is improved.

The tensile force of the silica gel surface is 5gf/25 mm-10 gf/25mm, the peeling force is 25gf/25 mm-30 gf/25mm, the transmittance is more than or equal to 91 percent, and the haze is less than 1 percent. Is a low-color protective film.

The product characteristics of the protective films of the three examples described above are as follows:

case(s)	Haze degree	Stretching force of silica gel surface	Peel force of silica gel surface	Transmittance of light	Product(s)
						A	0.3％	4～6gf/25mm	25～30gf/25mm	91.5％	Low-color protective film
II	＜1％	5～8gf/25mm	25～30gf/25mm	≥90％	Low-color protective film
						III	＜1％	5～10gf/25mm	25～30gf/25mm	≥91％	Low-color protective film

The above examples are only intended to represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The curved surface protective film with the multiple functional layers is characterized in that a UV hardening layer (21) is introduced on a first base material (11), a protective film layer (16) is arranged on the UV hardening layer (21), a silica gel layer (24) is introduced below a second base material (13), a fluorine release film (18) is arranged below the silica gel layer (24), a high-viscosity adhesive layer (22) is introduced on the second base material (13), and the high-viscosity adhesive layer (22) is attached to the other side, far away from the UV hardening layer (21), of the first base material (11);

the first substrate (11) has a thickness of 100 μm;

the thickness of the second substrate (13) is 100 mu m;

the thickness of the protective film layer (16) is 100 mu m;

the thickness of the fluorine release film (18) is 100 mu m;

the thickness of the UV hardening layer (21) is 7 mu m;

the thickness of the high-viscosity adhesive layer (22) is 10-15 mu m;

the thickness of the silica gel layer (24) is 20-50 mu m;

the UV hardening layer (21) comprises the following raw material components in parts by weight:

50-100 parts of solvent

30-60 parts of crosslinking monomer

20-50 parts of prepolymer

2-5 parts of photoinitiator

1-6 parts of anti-fouling agent

1-10 parts of anti-fingerprint agent;

the solvent is as follows: one or a mixture of toluene, butanone and propylene glycol methyl ether acetate;

the photoinitiator is: benzophenone and triethanolamine according to the weight ratio of 2:1 part by weight of mixing;

the anti-fouling agent is: a fluorine-containing compound;

the fluorine-containing compound is: one or a mixture of ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, fluorinated ethylene-propylene copolymer, perfluoroalkoxy resin, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer, polyvinylidene fluoride or polyvinyl fluoride;

adding a solvent in the preparation process, and volatilizing after the preparation;

the silica gel layer (24) comprises the following raw material components in parts by weight:

100 parts of organic silicon pressure-sensitive adhesive

5-20 parts of a blue light resistant agent;

the blue light resisting agent is: one or a mixture of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines or hindered amines;

the high-viscosity adhesive layer (22) comprises the following raw material components in parts by weight:

50-60 parts of viscous monomer

5-15 parts of cohesive monomer

3-10 parts of modified monomer

0.1-1 part of cross-linking agent

Plasticizer: 0.01 to 1 portion

Anti-shrinkage agent: 0.2-1 part;

the plasticizer is as follows: dibutyl phthalate;

the anti-shrinkage agent is: polyether modified siloxane;

50-100 parts of a solvent;

the solvent is as follows: one or a mixture of toluene and ethyl acetate;

2. The curved surface protective film with multiple functional layers according to claim 1, wherein the stain resistant agent of the UV hardening layer (21) is composed of 1 part of ethylene-tetrafluoroethylene copolymer and 0.4 part of fluorinated ethylene-propylene copolymer.

3. A method for preparing a curved surface protective film having multiple functional layers according to any one of claims 1 to 2, comprising:

s1, taking PET with the thickness of 100 mu m as a first base material (11), mixing an anti-fingerprint agent and an anti-pollution agent in UV glue, uniformly coating the surface of the first base material (11) with the mixed glue through micro-gravure coating, anilox roller or Slot-Die, wherein the coating thickness is 7 mu m, drying by an oven at 50-120 ℃, and curing by illumination of 300-550 mj/cm to form a UV hardened layer (21);

s2, coating a layer of 20-50 mu m mixture of organic silicon pressure-sensitive adhesive and anti-bluing agent by using 100 mu m PET as a second base material (13) through a comma type scraper or a Slot-Die, and curing at 80-200 ℃ through an oven to form a silica gel layer (24); after the silica gel layer (24) is finished, a layer of fluorine release film (18) is pasted on the silica gel layer (24), and the thickness of the fluorine release film (18) is 100 mu m;

s3, weighing the glue of the high-viscosity glue layer (22) according to the raw material components, and adding the weighed glue into a glue preparation barrel; weighing a solvent with corresponding weight in the preparation process, adding the solvent into a glue preparation barrel, stirring for 20-25 min, stopping stirring after fully stirring, uniformly coating the solvent on the other side, far away from a silica gel layer (24), of a second substrate layer (13), coating a high-viscosity glue layer (22) with the thickness of 10-15 mu m by a comma type scraper or Slot-Die, curing at the temperature of 80-160 ℃ by an oven, passing through a laminating roller, and laminating the high-viscosity glue layer (22) and the other side, far away from a UV hardening layer (21), of a first substrate layer (11);

s4, arranging a film protection layer (16) on the UV hardening layer (21), wherein the thickness of the film protection layer (16) is 100 microns;