A hinge film, its preparation method and use

Abstract

The application provides a hinge film and a preparation method and application thereof. The hinge film comprises a first protective layer, an intermediate layer and a second protective layer which are sequentially stacked; and the components of the intermediate layer comprise a block copolymer with polymethacrylate blocks and polyacrylate blocks. The hinge film provided by the application has high surface hardness, high wear resistance, good weather resistance, good solvent resistance, good flexibility, good bending resistance and very good adhesive strength with a passport polycarbonate data page.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional films, and particularly relates to a hinge film and a preparation method and application thereof. BACKGROUND

[0002] An ID card is generally composed of a data page, a hinge film, an embedded electronic chip and a cover, wherein the hinge film plays an important role in bonding and protecting other parts. The material used in the hinge film is usually TPU or PU, which has strong bending resistance and toughness, but the surface hardness is insufficient, the wear resistance is poor, and the weather resistance and solvent resistance are poor.

[0003] Therefore, in order to meet the actual application requirements, the surface hardness, wear resistance, weather resistance and solvent resistance of the hinge film need to be further improved. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a hinge film and a preparation method and application thereof. By designing the structure of the hinge film and selecting the materials of each layer, the hinge film has the advantages of high surface hardness, high wear resistance, good weather resistance and good solvent resistance.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a hinge film, which comprises a first protective layer, an intermediate layer and a second protective layer arranged in sequence. The components of the intermediate layer include a block copolymer having a polymethacrylate block and a polyacrylate block.

[0007] The cross-sectional structure diagram of the hinge film provided by the present application is shown in Figure 2 The hinge film includes a first protective layer, an intermediate layer and a second protective layer. The components of the intermediate layer include a block copolymer having a polymethacrylate block and a polyacrylate block. By designing the three-layer structure and selecting the block copolymer having a polymethacrylate block and a polyacrylate block, the surface hardness, wear resistance and elasticity of the hinge film can be improved.

[0008] The following is a preferred technical solution of the present application, but not as a limitation on the technical solutions provided by the present application. Through the following preferred technical solution, the purpose and beneficial effects of the present application can be better achieved and realized.

[0009] As a preferred technical solution, the block copolymer having a polymethacrylate block and a polyacrylate block has a melt index of 0.5-40 g / 10 min at 190°C under a load of 2.16 kg, for example, can be 0.5 g / 10 min, 1 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min or 40 g / 10 min, and specific point values between the above point values, for the sake of brevity and simplicity, the present application does not exhaustively list the specific point values included in the range.

[0010] Preferably, the block copolymer having a polymethacrylate block and a polyacrylate block includes any one of a diblock copolymer having a polymethacrylate block and a polyacrylate block, a triblock copolymer having a polymethacrylate block and a polyacrylate block, a tetrablock copolymer having a polymethacrylate block and a polyacrylate block, a star block copolymer having a polymethacrylate block and a polyacrylate block, or a branched block copolymer having a polymethacrylate block and a polyacrylate block, or a combination of at least two thereof.

[0011] In the present application, the monomer used to prepare the polymethacrylate block includes methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, t-butyl methacrylate, pentyl methacrylate, isopentyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, pentadecyl methacrylate, dodecyl methacrylate, isobornyl methacrylate, phenyl methacrylate, benzyl methacrylate, phenoxyethyl methacrylate, 2-hydroxyethyl methacrylate, 2-methoxyethyl methacrylate, glycidyl methacrylate, or allyl methacrylate, etc., and any one of these methacrylates or a combination of at least two thereof is polymerized to obtain the polymethacrylate block.

[0012] In the present application, the monomers used for preparing the polyacrylate block include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, t-butyl acrylate, amyl acrylate, isoamyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, pentadecyl acrylate, dodecyl acrylate, isobornyl acrylate, phenyl acrylate, benzyl acrylate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-methoxyethyl acrylate, glycidyl acrylate or allyl acrylate, etc., and the polyacrylate block is obtained by polymerization of one of these acrylates alone or a combination of at least two of them.

[0013] In the present application, when the block copolymer having a polymethacrylate block and a polyacrylate block is a tri-block copolymer having a polymethacrylate block and a polyacrylate block, the tri-block copolymer having a polymethacrylate block and a polyacrylate block can have one or two polymethacrylate blocks, and when there are two polymethacrylate blocks, the glass transition temperatures of the polymethacrylate blocks can be the same or different, and the structural units of the polymethacrylate blocks can be the same or different.

[0014] In the present application, when the block copolymer having a polymethacrylate block and a polyacrylate block is a tetra-block copolymer having a polymethacrylate block and a polyacrylate block, the tri-block copolymer having a polymethacrylate block and a polyacrylate block can have one, two or three polymethacrylate blocks, and when there are two or three polymethacrylate blocks, the glass transition temperatures of the polymethacrylate blocks can be the same or different, and the structural units of the polymethacrylate blocks can be the same or different.

[0015] Preferably, the glass transition temperature of the polymethacrylate block is 100-120°C, for example, it can be 100°C, 102°C, 104°C, 106°C, 108°C, 110°C, 112°C, 114°C, 116°C, 118°C or 120°C, and specific point values between the above-mentioned point values, the present application will not be exhaustively listed specific point values included in the range, limited to the length and for the sake of simplicity.

[0016] Preferably, the glass transition temperature of the polyacrylate block is -40 to -50°C, for example, it can be -40°C, -41°C, -42°C, -43°C, -44°C, -45°C, -46°C, -47°C, -48°C, -49°C or -50°C, and specific point values between the above-mentioned point values, the present application will not be exhaustively listed specific point values included in the range, limited to the length and for the sake of simplicity.

[0017] In the present application, the block copolymer having a polymethacrylate block and a polyacrylate block is a commercially available product, and exemplarily, the polymethyl methacrylate-poly(n-butyl acrylate)-polymethyl methacrylate triblock copolymer can be selected from LA2140, LA2330, LA2250, LA4285, LB550, LM730H of Kuraray Co., Ltd.

[0018] Preferably, the block copolymer having a polymethacrylate block and a polyacrylate block in the intermediate layer is 40-70 parts by weight, for example, can be 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, or 70 parts by weight, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range.

[0019] Preferably, the components of the intermediate layer further include any one or a combination of at least two of an antioxidant, an ultraviolet absorber, or a light stabilizer.

[0020] Preferably, the antioxidant is 1-5 parts by weight, the ultraviolet absorber is 1-5 parts by weight, and the light stabilizer is 1-5 parts by weight. By adding the antioxidant, the ultraviolet absorber, and the light stabilizer, etc., the weather resistance and the solvent resistance of the hinge film can be improved.

[0021] The antioxidant is 1-5 parts by weight, for example, can be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, or 5 parts by weight, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range.

[0022] The ultraviolet absorber is 1-5 parts by weight, for example, can be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, or 5 parts by weight, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range.

[0023] The light stabilizer is 1-5 parts by weight, for example, can be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, or 5 parts by weight, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range.

[0024] Preferably, the thickness of the intermediate layer is 5-2000 μm, for example, can be, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 2000 μm, and specific point values between the above point values, the specific point values included in the range are not listed exhaustively due to the limited space and for the sake of brevity.

[0025] Preferably, the thickness of the first protective layer and the second protective layer is independently 5-100 μm.

[0026] Preferably, the first protective layer and the second protective layer independently include the following preparation raw materials: resin preparation raw materials 20-90 parts by weight, photoinitiator 3-6 parts by weight, auxiliary 0-8 parts by weight, and solvent 30-40 parts by weight.

[0027] The resin preparation raw materials are 20-90 parts by weight, for example, can be 20 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 50 parts by weight, 60 parts by weight, 70 parts by weight, 80 parts by weight, or 90 parts by weight, and specific point values between the above point values, the specific point values included in the range are not listed exhaustively due to the limited space and for the sake of brevity.

[0028] The photoinitiator is 3-6 parts by weight, for example, can be 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, or 6 parts by weight, and specific point values between the above point values, the specific point values included in the range are not listed exhaustively due to the limited space and for the sake of brevity.

[0029] The auxiliary is 0-8 parts by weight, for example, can be 0 parts by weight, 1 parts by weight, 2 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 7.5 parts by weight, or 8 parts by weight, and specific point values between the above point values, the specific point values included in the range are not listed exhaustively due to the limited space and for the sake of brevity.

[0030] The solvent is 30 to 40 parts by weight, for example, can be 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, or 40 parts by weight, and specific point values between the above-mentioned point values, the present application does not list the specific point values included in the range for the sake of brevity and consideration of the volume, but not exhaustively.

[0031] Preferably, the resin preparation raw material includes an acrylate monomer and / or an acrylate oligomer.

[0032] The acrylate monomer refers to a lipid or a lipid homolog thereof containing an acrylic acid structure, containing at least one acrylate functional group, including but not limited to: cycloaliphatic methacrylate, tridecyl methacrylate, dicyclopentadiene methacrylate, methoxy polyethylene glycol monomethacrylate, triethylene glycol ethyl ether methacrylate, alkoxy dodecyl acrylate, tetrahydrofuran methacrylate, alicyclic acrylate, 2(2-ethoxy) ethyl acrylate, octadecyl acrylate, tetrahydrofuran acrylate, dodecyl methacrylate, stearyl methacrylate, dodecyl acrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, sec-butyl methacrylate, sec-butyl acrylate, isodecyl acrylate, cycloaliphatic acrylate, isobornyl methacrylate, isooctyl acrylate, tridecyl acrylate, caprolactone acrylate, (4) ethoxylated nonyl phenol acrylate, isobornyl acrylate, trimethylolpropane formal acrylate, lauryl acrylate, sec-butyl methacrylate, lauryl methacrylate, methoxy polyethylene glycol methacrylate, alkylated tetrahydrofuran acrylate, alkylated nonyl phenol acrylate, alkylated phenol acrylate, cyclohexane dimethanol diacrylate, alkylated neopentyl glycol diacrylate, ethoxylated bisphenol A dimethacrylate, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol (200) dimethacrylate, 1,3- butanediol diacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, polyethylene glycol (600) dimethacrylate, polyethylene glycol (200) diacrylate, polyethylene glycol (400) dimethacrylate, 1,12-dodecanediol dimethacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, 1,3-butylene glycol dimethacrylate, tripropyleneglycol diacrylate, polyethylene glycol (400) diacrylate, (2) ethoxylated bisphenol A dimethacrylate, (3) ethoxylated bisphenol A diacrylate, (10) ethoxylated bisphenol A dimethacrylate, dipropylene glycol diacrylate, ethoxylated (4) bisphenol A dimethacrylate, ethoxylated (6) bisphenol A dimethacrylate, polyethylene glycol (600) diacrylate, tricyclosilane dimethanol diacrylate, (2) propoxylated neopentyl glycol diacrylate, ethoxylated (30) bisphenol A diacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, tris(2-hydroxyethyl) isocyanurate triacrylate, (20) ethoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, (3) ethoxylated trimethylolpropane triacrylate, (6) ethoxylated trimethylolpropane triacrylate, (9) ethoxylated trimethylolpropane triacrylate, (15) ethoxylated trimethylolpropane triacrylate, (3) propoxylated glycerol triacrylate, dipentaerythritol hexaacrylate, pentaerythritol tetraacrylate, di-trimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate, di-trimethylolpropane tetraacrylate, or (4) ethoxylated pentaerythritol tetraacrylate, and the like, and derivatives of the above acrylates can also be included.

[0033] Preferably, the viscosity of the acrylate oligomer is 400-20000 cPs / 25°C, for example, it can be 400 cPs / 25°C, 500 cPs / 25°C, 600 cPs / 25°C, 700 cPs / 25°C, 800 cPs / 25°C, 900 cPs / 25°C, 1000 cPs / 25°C, 1100 cPs / 25°C, 1200 cPs / 25°C, 1300 cPs / 25°C, 1400 cPs / 25°C, 1500 cPs / 25°C, 1600 cPs / 25°C, 1700 cPs / 25°C, 1800 cPs / 25°C, 1900 cPs / 25°C, 2000 cPs / 25°C, 5000 cPs / 25°C, 10000 cPs / 25°C, 15000 cPs / 25°C, or 20000 cPs / 25°C, and specific point values between the above point values, the present application does not exhaustively list the specific point values included in the range for the sake of brevity and simplicity.

[0034] Oligomers, also known as oligomers, oligomers, oligomers, oligomers or oligomers, are polymers composed of a small number of repeating units, with a relative molecular mass between small molecules and macromolecules. The acrylate oligomers described in the present invention include, but are not limited to: aliphatic urethane acrylate, urethane acrylate, aromatic urethane acrylate, epoxy acrylate, epoxidized soybean oil acrylate, modified epoxy acrylate, epoxy methacrylate, aliphatic silicone acrylate, acidic functional acrylate, silicone urethane acrylate, polybutadiene dimethacrylate, polybutadiene diacrylate, polyester acrylate, polyether acrylate, acrylate polyester or chlorinated polyester acrylate, etc.; preferably one or a combination of epoxy acrylate, polyester acrylate, urethane acrylate or polyether acrylate.

[0035] The photoinitiator includes any one or a combination of at least two of 2-hydroxy-2-methyl-1-phenylpropanone, 2,4,6-trimethylbenzoyl ethyl phenyl phosphonate, methyl benzoylformate, 1-hydroxycyclohexyl phenyl ketone, diethoxy-phenyl phenylacetophenone, diethoxyphenylacetophenone, dimethoxyphenylacetophenone, 2,4-dihydroxybenzophenone, 2,4,6-trimethylbenzoyl ethoxy phenyl phosphine oxide, 2,2-di-sec-butoxyphenylacetophenone, alpha-hydroxy ketone, hydroxycyclohexyl phenyl ketone, hydroxymethyl phenyl ketone, 2-methyl-1-[4-methylthiophenyl]-2-morpholino-1-propanone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 4-(2-hydroxyethoxy)phenyl-(2-hydroxy-2-propyl)ketone or di(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide.

[0036] Antioxidants are used to prevent the loss of strength and toughness of polymer materials due to oxidative degradation, the antioxidants in the present invention include any one or a combination of at least two of hindered phenols (phenolic compounds with a sterically hindered structure, the main type of chain termination antioxidant: divided into monohydroxy hindered phenols and polyhydroxy hindered phenols) and / or hindered amines (by capturing peroxide radicals to prevent or inhibit chain initiation and chain growth reactions, thereby terminating the free radical chain reaction, to prevent oxidation), including but not limited to the following brands: BASF's Irganox B225, Irganox 1076, Irganox MD 1024, Irganox 1010, Irganox 245, Irganox 500, Irganox 245(ED), Irganox 245-DW, Irganox 1035, Irganox 1076, Irganox 1135, Irganox 1425, Irgafos 126(ED), Irganox 168, Irganox PS 802, Irganox B 225(ED), Irganox B 900.

[0037] UV absorbers are able to absorb the UV part of sunlight and fluorescent light sources without themselves being changed, the UV absorbers in the present invention include any one or a combination of at least two of salicylate, benzophenone, benzotriazole, substituted acrylonitrile, triazine or hindered amine. Including but not limited to the following brands: BASF's Tinuvin 400-DW(N), Tinuvin 477-DW(N), Tinuvin 479-DW(N), Tinuvin 99-2, Tinuvin 326, Tinuvin 384-2, Tinuvin 900, Tinuvin 928, Tinuvin 1130, Tinuvin 460, Tinuvin 477, Tinuvin 400, Tinuvin 405, Tinuvin 479, Chimassorb 81(ED), Tinuvin Carboprotect.

[0038] Light stabilizers are additives to polymeric articles (e.g. plastics, rubbers, paints, synthetic fibers) that can shield or absorb UV energy, quench singlet oxygen, and decompose hydroperoxides into non-reactive species, etc. to prevent or delay the photochemical reaction and the photoaging process, thereby extending the service life of the polymeric articles. The light stabilizers in the present application include any one or a combination of at least two of the hindered amine light stabilizers, including but not limited to the following: Tinuvin 292, Tinuvin 292HP, Tinuvin 123-DW, Tinuvin 111FDL, Tinuvin 770DF(ED), Tinuvin 123, Tinuvin 152, Tinuvin 249, Tinuvin 622SF, Tinuvin 5100, Tinuvin 1198, Tinuvin 111FDL, Tinuvin 5050, Tinuvin 5060, Tinuvin 5151, Tinuvin 5248, Tinuvin 5251, Tinuvin 5333-DW(N), Tinuvin B 75(ED) from BASF.

[0039] Preferably, the adjuvant includes an adhesion promoter and / or a leveling agent.

[0040] Preferably, the adhesion promoter in the adjuvant is 0-3 parts by weight, and the leveling agent is 0-5 parts by weight.

[0041] The adhesion promoter is 0-3 parts by weight, for example, it can be 0, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, or 3 parts by weight, and specific point values between the above point values. Due to the consideration of brevity and simplicity, the present application does not exhaustively list the specific point values included in the range.

[0042] The adhesion promoter includes but is not limited to the following: Silquest A-1170, Silquest A-171, Silquest A-187, Silquest A-1110, Silquest A-1100, Silquest A-186, Silquest A-1871, Silquest A-2120, Silquest A-Link 597, Silquest A-9627, or Silquest Y-Y9669 from Momentive.

[0043] The leveling agent is 0-5 parts by weight, for example, can be 0, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight or 5 parts by weight, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be listed in the range including the specific point values.

[0044] The leveling agent refers to effectively reducing the surface tension of the coating film, obtaining a uniform, flat and smooth coating layer in the coating and film forming process, and improving the film forming property, including but not limited to leveling agents with the trade name of TEGO Glide 440, TEGO Glide 110, TEGO Flow 425, TEGO Glide 482, TEGO Glide 410, EASYTECH ST-5050, BYK333, BYK341, BYK349, TERIC 320, BYK348, N-2218, BYK306 or BYK307, all purchased from Evonik and BYK Company.

[0045] Preferably, the solvent includes any one of ethanol, isopropyl alcohol, ethyl acetate, butyl acetate, methyl isobutyl ketone or butanone, or a combination of at least two.

[0046] In a second aspect, the present application provides a preparation method of the hinge film as described in the first aspect, and the preparation method comprises the following steps:

[0047] (1) mixing the block copolymer having a polymethacrylate block and a polyacrylate block, optionally an antioxidant, optionally an ultraviolet absorber and optionally a light stabilizer, sequentially melting, co-extruding and shaping to obtain an intermediate layer;

[0048] (2) mixing the raw materials for preparing the first protective layer and coating on one side of the intermediate layer, mixing the raw materials for preparing the second protective layer and coating on the other side of the intermediate layer, and curing the surface coating of the intermediate layer to obtain the hinge film.

[0049] The preparation method of the hinge film provided by the present application adopts the components of the intermediate layer to co-extrude and shape, then mixes the raw materials for preparing the first protective layer and the raw materials for preparing the second protective layer, and then directly coats on the surface of the intermediate layer respectively, which has the advantages of high efficiency, low energy consumption, easy processing, simple equipment and simple operation.

[0050] Preferably, the melting temperature is 130-170℃, for example, it can be 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃ or 170℃, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0051] Preferably, the coating method includes any one of slot coating, blade coating, or roller coating.

[0052] Preferably, the curing method includes ultraviolet light curing.

[0053] Preferably, the UV curing radiation intensity is 100-1500 mJ / cm². 2 For example, it can be 100mJ / cm 2 200mJ / cm 2 300mJ / cm 2 400mJ / cm 2 500mJ / cm 2 600mJ / cm 2 700mJ / cm 2 800mJ / cm 2 900mJ / cm 2 1000mJ / cm 2 1100mJ / cm 2 1200mJ / cm 2 1300mJ / cm 2 1400mJ / cm 2 Or 1500mJ / cm 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0054] Thirdly, the present invention provides an application of the hinge film as described in the first aspect, the application of the hinge film in a passport.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The hinge film provided by this invention has high surface hardness, high wear resistance, good weather resistance, good solvent resistance, and strong adhesion. The pencil hardness of the hinge film surface is above 2B, and it passes the water resistance test, ethanol resistance test, and methyl ethyl ketone resistance test; the Δb value in the weather resistance test is 0.1-0.4; and the adhesion grade is 5B. Attached Figure Description

[0057] Figure 1is a process schematic diagram of the preparation method of the hinge film provided in Example 1;

[0058] wherein, 1-co-extrusion die; 2a, 2b, 2c, 2d-drawing roller; 3-slit coating die; 4-oven; 5-ultraviolet light source;

[0059] Figure 2 is a cross-sectional structure schematic diagram of the hinge film provided in Example 1;

[0060] wherein, 1-first protective layer, 2-intermediate layer, 3-second protective layer. DETAILED DESCRIPTION

[0061] The technical solutions of the present application will be further described below in conjunction with the drawings and through specific embodiments. Those skilled in the art should understand that the described embodiments are only to help understand the present application and should not be regarded as specific limitations on the present application.

[0062] Some components in the following examples and comparative examples are from the following sources:

[0063] Unless otherwise specified, various raw materials of the present application can be commercially available or prepared according to conventional methods in the art.

[0064] (1) Block copolymer with polymethacrylate block and polyacrylate block:

[0065] a. Block copolymer (LA2140): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 31 g / 10 min;

[0066] b. Block copolymer (LA2330): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 3.7 g / 10 min;

[0067] c. Block copolymer (LA2250): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 25 g / 10 min;

[0068] d. Block copolymer (LA4285): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 1.5 g / 10 min;

[0069] e. Block copolymer (LB550): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 3.8 g / 10 min;

[0070] f. Block copolymer (LM730H): purchased from Kuraray Co., Ltd., melt index at 190℃ under a load of 2.16 kg is 1.1 g / 10 min;

[0071] (2) Antioxidants: purchased from BASF Corporation;

[0072] (3) UV absorbers: purchased from BASF Corporation;

[0073] (4) Light stabilizers: purchased from BASF Corporation;

[0074] (5) Monomers and acrylate-based oligomers: purchased from Satomer and Allnex;

[0075] (6) Adhesion promoters: purchased from Chemours, BYK, Evonik, Dow Coring, Momentive and 3M;

[0076] (7) Photoinitiators: all purchased from BASF Corporation;

[0077] (8) Leveling agents: purchased from Wacker and BYK;

[0078] (9) Polyurethane: Desmopan 48 purchased from Covestro.

[0079] The following examples and comparative examples were produced on a multi-layer co-extrusion production line provided by Breyer GmbH Maschinenfabrik, Germany, Extrusion line BREYER OptiFlex. The components used to produce the co-extruded film included an extruder with a screw diameter of 60 mm and a length of 33 D, a melt pump, a crosshead, a flat sheet die with a width of 450 mm, a three-roll calender with a horizontal roller arrangement, the third roller rotated about 45° relative to the horizontal position, a drum conveyor, a thickness gauge, a device for applying a protective film on both sides, a take-off device, and a winder.

[0080] The coating process was completed using a Nordson Slot-die coating device, USA, and the UV curing device was a Heraeus F600S UV curing system, USA, with a focusing distance of 53 mm from the light source to the substrate surface.

[0081] Example 1

[0082] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0083] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 40 parts by weight, antioxidant (Irganox 1010) 1 part by weight, ultraviolet absorber (Tinuvin 326) 1 part by weight, and light stabilizer (Tinuvin 249) 1 part by weight.

[0084] The first protective layer comprises the following raw materials by weight parts: tetrahydrofurfuryl methacrylate (SR203) 5 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 5 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 10 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 3 parts by weight, and isopropyl alcohol 30 parts by weight.

[0085] The second protective layer comprises the following raw materials by weight parts: alkoxylated tetrahydrofurfuryl acrylate (SR611) 30 parts by weight, 1,3-butanediol dimethacrylate (SR297) 30 parts by weight, polyester acrylate (CN2254NS) 30 parts by weight, photoinitiator hydroxymethyl phenylpropanone 6 parts by weight, adhesion promoter Silquest A-1170 1 part by weight, leveling agent TEGO GLIDE 4401 part by weight, and isopropyl alcohol 30 parts by weight.

[0086] The process flow diagram of the preparation method of the hinge film is shown in Figure 1 The preparation method comprises the following steps:

[0087] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 130°C and conveyed to the co-extrusion die 1 with an extrusion gap of 5 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 3 cm. The melt extruded from the co-extrusion die 1 reaches the calender, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide rollers;

[0088] (2) The raw materials for preparing the first protective layer and the second protective layer are mixed uniformly respectively, and then uniformly coated on the upper and lower surfaces of the intermediate layer prepared in step (1) by using the slit coating die 3 respectively. After the solvent is volatilized and dried in the oven 4, curing is carried out in the ultraviolet curing system with ultraviolet light source 5. The specific process parameters are shown in Table 1, and the hinge film is obtained.

[0089] Example 2

[0090] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0091] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 55 parts by weight, antioxidant (Irganox 245-DW) 2 parts by weight, ultraviolet absorber (Tinuvin 99-2) 2 parts by weight and light stabilizer (Tinuvin 292) 2 parts by weight.

[0092] The first protective layer comprises the following raw materials by weight parts: trimethylolpropane triacrylate (SR351NS) 10 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 10 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 50 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 3 parts by weight, adhesion promoter Silquest A-1170 2 parts by weight, leveling agent BYK333 2 parts by weight and isopropyl alcohol 35 parts by weight.

[0093] The second protective layer comprises the following raw materials by weight parts: alkylated nonyl phenol acrylate (SR614A) 30 parts by weight, dipropylene glycol diacrylate (SR508 NS) 20 parts by weight, (4) ethoxylated pentaerythritol tetraacrylate (SR494 NS) 10 parts by weight, aromatic polyurethane acrylate (CN9167) 20 parts by weight, photoinitiator hydroxymethyl phenyl ketone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent TEGOGLIDE 440 5 parts by weight and isopropyl alcohol 40 parts by weight.

[0094] The preparation method of the hinge film comprises the following steps:

[0095] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 130°C and conveyed to the co-extrusion die 1 with an extrusion gap of 10 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 1 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide rollers;

[0096] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0097] Example 3

[0098] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0099] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 70 parts by weight, antioxidant (Irganox 1010) 5 parts by weight, ultraviolet absorber (Irganox 245(ED)) 5 parts by weight, light stabilizer (Tinuvin 5060) 5 parts by weight.

[0100] The first protective layer comprises the following raw materials by weight parts: alkoxylated tetrahydrofuran acrylate (SR611) 25 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 25 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 25 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK333 4 parts by weight and isopropyl alcohol 40 parts by weight.

[0101] The second protective layer comprises the following raw materials by weight parts: aliphatic polyurethane acrylate (CN9100NS) 90 parts by weight, photoinitiator hydroxymethyl phenylpropanone 3 parts by weight, leveling agent TEGO GLIDE 440 5 parts by weight and isopropyl alcohol 40 parts by weight.

[0102] The preparation method of the hinge film comprises the following steps:

[0103] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 130°C and conveyed to the co-extrusion die 1 with an extrusion gap of 20μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 7cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide rollers;

[0104] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0105] Example 4

[0106] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0107] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 70 parts by weight, antioxidant (Irganox 500) 5 parts by weight, ultraviolet absorber (Tinuvin 479) 5 parts by weight, light stabilizer (Tinuvin 123) 5 parts by weight.

[0108] The first protective layer comprises the following raw materials by weight parts: alkoxylated nonyl phenol acrylate (SR614A) 20 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 50 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 20 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 6 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight and isopropyl alcohol 35 parts by weight.

[0109] The second protective layer comprises the following raw materials by weight parts: alkoxylated phenol acrylate (SR9087) 40 parts by weight, aromatic polyurethane acrylate (CN9783) 50 parts by weight, photoinitiator hydroxymethyl phenyl ketone 6 parts by weight, leveling agent TEGO GLIDE 425 2 parts by weight and isopropyl alcohol 35 parts by weight.

[0110] The preparation method of the hinge film comprises the following steps:

[0111] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 130°C and conveyed to the co-extrusion die 1 with an extrusion gap of 40 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 12 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide roller;

[0112] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0113] Example 5

[0114] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer which are sequentially stacked; the thickness of each layer is shown in Table 1.

[0115] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 55 parts by weight, antioxidant (Irganox 1010) 1 part by weight, ultraviolet absorber (Tinuvin 928) 1 part by weight, light stabilizer (Tinuvin 123) 1 part by weight.

[0116] The first protective layer comprises the following raw materials by weight parts: aliphatic polyurethane acrylate (CN9100NS) 20 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 50 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 20 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 6 parts by weight, adhesion promoter Silquest A-1170 1 part by weight and isopropyl alcohol 30 parts by weight.

[0117] The second protective layer comprises the following raw materials by weight parts: stearyl acrylate (SR257) 20 parts by weight, ethylene glycol dimethacrylate (SR206) 20 parts by weight, trimethylolpropane triacrylate (SR351) 10 parts by weight, polyurethane acrylate (CN972) 20 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent TEGO GLIDE 425 5 parts by weight and isopropyl alcohol 30 parts by weight.

[0118] The preparation method of the hinge film comprises the following steps:

[0119] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 140°C and conveyed to the co-extrusion die 1 with an extrusion gap of 100 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 15 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide roller;

[0120] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0121] Example 6

[0122] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer which are sequentially stacked; the thickness of each layer is shown in Table 1.

[0123] The intermediate layer comprises the following components by weight parts: block copolymer (LA2140) 40 parts by weight, antioxidant (Irgafos 126 (ED)) 5 parts by weight, ultraviolet absorber (Tinuvin 928) 5 parts by weight, light stabilizer (Tinuvin 249) 5 parts by weight.

[0124] The first protective layer comprises the following raw materials by weight parts: alkoxylated phenol acrylate (SR9087) 25 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 40 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 25 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK333 3 parts by weight and isopropyl alcohol 40 parts by weight.

[0125] The second protective layer comprises the following raw materials by weight parts: methoxypolyethylene glycol monomethacrylate (SR550) 10 parts by weight, 1,6-hexanediol diacrylate (SR238 NS) 20 parts by weight, (20) ethoxylated trimethylolpropane triacrylate (SR415) 20 parts by weight, aliphatic polyurethane acrylate (CN310 NS) 10 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 4 parts by weight, adhesion promoter Silquest A-1170 2 parts by weight, leveling agent TEGO GLIDE 482 5 parts by weight and isopropyl alcohol 35 parts by weight.

[0126] The preparation method of the hinge film comprises the following steps:

[0127] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 140°C and conveyed to the co-extrusion die 1 with an extrusion gap of 150 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide rollers;

[0128] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0129] Example 7

[0130] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0131] The intermediate layer comprises the following components by weight parts: block copolymer (LA2330) 70 parts by weight, antioxidant (Irganox 1010) 2 parts by weight, ultraviolet absorber (Tinuvin 405) 2 parts by weight, light stabilizer (Tinuvin 5060) 2 parts by weight.

[0132] The first protective layer comprises the following raw materials by weight parts: aliphatic polyurethane acrylate (CN9100NS) 20 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 50 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 20 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK333 1 part by weight and isopropyl alcohol 35 parts by weight.

[0133] The second protective layer comprises the following raw materials by weight parts: aliphatic silicone acrylate (CN9800) 90 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 3 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent TEGO GLIDE 425 4 parts by weight and isopropyl alcohol 40 parts by weight.

[0134] The preparation method of the hinge film comprises the following steps:

[0135] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 140°C and conveyed to the co-extrusion die 1 with an extrusion gap of 300 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 2 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide roller;

[0136] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0137] Example 8

[0138] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0139] The intermediate layer comprises the following components by weight parts: block copolymer (LA2330) 70 parts by weight, antioxidant (Irganox 500) 1 part by weight, ultraviolet absorber (Tinuvin 479) 1 part by weight, light stabilizer (Tinuvin 152) 1 part by weight.

[0140] The first protective layer comprises the following raw materials by weight parts: octadecyl acrylate (SR257) 20 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 50 parts by weight, (3) ethoxylated trimethylolpropane triacrylate (SR454 NS) 20 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 6 parts by weight, adhesion promoter Silquest A-1170 1 part by weight, leveling agent BYK 333 3 parts by weight, and isopropyl alcohol 40 parts by weight.

[0141] The second protective layer comprises the following raw materials by weight parts: 2(2-ethoxy)ethyl acrylate (SR256) 20 parts by weight, neopentyl glycol diacrylate (SR247) 20 parts by weight, (9) ethoxylated trimethylolpropane triacrylate (SR502 NS) 50 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester 3 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK 349 1 part by weight, and isopropyl alcohol 40 parts by weight.

[0142] The preparation method of the hinge film comprises the following steps:

[0143] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 140°C and conveyed to the co-extrusion die 1 with an extrusion gap of 600 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 1 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide roller;

[0144] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0145] Example 9

[0146] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0147] The intermediate layer comprises the following components by weight parts: block copolymer (LA2330) 60 parts by weight, antioxidant (Irganox 1010) 1 part by weight, ultraviolet absorber (Tinuvin 479) 1 part by weight, light stabilizer (Tinuvin 111 FDL) 1 part by weight.

[0148] The first protective layer comprises the following raw materials by weight parts: methoxy polyethylene glycol monomethacrylate (SR550) 10 parts by weight, 1,6-hexanediol diacrylate (SR238 NS) 40 parts by weight, (20) ethoxylated trimethylolpropane triacrylate (SR415) 40 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK333 2 parts by weight and methyl isobutyl ketone 30 parts by weight.

[0149] The second protective layer comprises the following raw materials by weight parts: tetrahydrofurfuryl methacrylate (SR285) 50 parts by weight, silicone polyurethane acrylate (CN990) 30 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK349 2 parts by weight and isopropyl alcohol 40 parts by weight.

[0150] The preparation method of the hinge film comprises the following steps:

[0151] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 140°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1500 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 5 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide rollers;

[0152] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0153] Example 10

[0154] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer which are sequentially stacked; the thickness of each layer is shown in Table 1.

[0155] The intermediate layer comprises the following components by weight parts: block copolymer (LA2250) 60 parts, antioxidant (Irganox B 900) 3 parts by weight, ultraviolet absorber (Tinuvin Carboprotect) 3 parts by weight, light stabilizer (Tinuvin 292HP) 3 parts by weight.

[0156] The first protective layer comprises the following raw materials by weight parts: 2(2-ethoxy)ethyl acrylate (SR256) 30 parts by weight, neopentyl glycol diacrylate (SR247) 20 parts by weight, (9) ethoxylated trimethylolpropane triacrylate (SR502 NS) 20 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 1 part by weight, leveling agent BYK333 2 parts by weight and isopropyl alcohol 40 parts by weight.

[0157] The second protective layer comprises the following raw materials by weight parts: stearyl methacrylate (SR324 NS) 20 parts by weight, ethylene glycol dimethacrylate (SR206) 20 parts by weight, pentaerythritol triacrylate (SR444 NS) 30 parts by weight, polyester acrylate (CN2282) 10 parts by weight, photoinitiator 2,2-di-sec-butoxyphenylacetophenone 3 parts by weight, adhesion promoter Silquest A-1170 2 parts by weight, leveling agent BYK307 3 parts by weight and isopropyl alcohol 40 parts by weight.

[0158] The preparation method of the hinge film comprises the following steps:

[0159] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 150°C and conveyed to the co-extrusion die 1 with an extrusion gap of 2000 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 50 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide rollers;

[0160] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0161] Example 11

[0162] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0163] The intermediate layer comprises the following components by weight parts: block copolymer (LA2250) 40 parts by weight, antioxidant (Irganox 500) 2 parts by weight, ultraviolet absorber (Tinuvin 460) 2 parts by weight, light stabilizer (Tinuvin 5100) 2 parts by weight, and mixed uniformly.

[0164] The first protective layer comprises the following raw materials by weight parts: methoxy polyethylene glycol monomethacrylate (SR550) 20 parts by weight, 1,6-hexanediol diacrylate (SR238 NS) 40 parts by weight, (20) ethoxylated trimethylolpropane triacrylate (SR415) 25 parts by weight, aliphatic polyurethane acrylate (CN310 NS) 5 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 4 parts by weight, adhesion promoter Silquest A-1170 2 parts by weight, leveling agent BYK333 3 parts by weight, and isopropyl alcohol 40 parts by weight.

[0165] The second protective layer comprises the following raw materials by weight parts: di-trimethylolpropane tetraacrylate (SR355 NS) 10 parts by weight, modified epoxy acrylate (CN118) 60 parts by weight, photoinitiator 2,2-di-sec-butoxyphenylacetophenone 6 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight, leveling agent BYK307 2 parts by weight, and isopropyl alcohol 35 parts by weight.

[0166] The preparation method of the hinge film comprises the following steps:

[0167] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 150°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1000 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and cooled on the guide roller;

[0168] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0169] Example 12

[0170] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0171] The intermediate layer comprises the following components by weight parts: block copolymer (LA2250) 50 parts, antioxidant (Irganox 1010) 5 parts, ultraviolet absorber (Tinuvin 326) 5 parts, light stabilizer (Tinuvin 5251) 5 parts.

[0172] The first protective layer comprises the following raw materials by weight parts: octadecyl acrylate (LA2250) 25 parts, ethylene glycol dimethacrylate (SR206) 25 parts, trimethylolpropane triacrylate (SR351) 10 parts, polyurethane acrylate (CN972) 20 parts, photoinitiator 2,4-dihydroxybenzophenone 4 parts, adhesion promoter Silquest A-1170 2 parts, leveling agent BYK333 3 parts and isopropyl alcohol 40 parts by weight.

[0173] The second protective layer comprises the following raw materials by weight parts: tricyclosilane dimethanol diacrylate (SR833 NS) 40 parts, epoxidized soybean oil acrylate (CN111) 30 parts, photoinitiator dimethoxyphenyl phenylacetophenone 6 parts, adhesion promoter BYK-C 8000 2 parts, leveling agent BYK333 3 parts and isopropyl alcohol 40 parts.

[0174] The preparation method of the hinge film comprises the following steps:

[0175] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 150°C and conveyed to the co-extrusion die 1 with an extrusion gap of 900 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the calendering setting and temperature control cooling of the intermediate layer are carried out on the guide roller;

[0176] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0177] Example 13

[0178] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0179] The intermediate layer comprises the following components by weight parts: block copolymer (LA2250) 50 parts, antioxidant (Irganox 500) 5 parts, ultraviolet absorber (Irganox 1035) 5 parts, light stabilizer (Tinuvin 1198) 5 parts.

[0180] The first protective layer comprises the following raw materials by weight: alkoxylated phenol acrylate (SR9087) 30 parts, aromatic urethane acrylate (CN9783) 30 parts, photoinitiator hydroxymethyl phenyl ketone 6 parts, adhesion promoter Silquest A-1170 2 parts, leveling agent TEGO GLIDE 425 3 parts and isopropyl alcohol 40 parts by weight.

[0181] The second protective layer comprises the following raw materials by weight: isooctyl acrylate (SR440) 30 parts, alkoxylated hexanediol diacrylate (CD564) 20 parts, pentaerythritol triacrylate (SR444) 20 parts, epoxy acrylate (CN2204 NS) 10 parts, photoinitiator dimethoxy phenyl phenyl ketone 3 parts, adhesion promoter BYK-4509 3 parts, leveling agent BYK348 5 parts and isopropyl alcohol 40 parts.

[0182] The preparation method of the hinge film comprises the following steps:

[0183] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 150°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1000 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide roller;

[0184] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0185] Example 14

[0186] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0187] The intermediate layer comprises the following components by weight: block copolymer (LA2250) 50 parts, antioxidant (Irganox 1010) 5 parts, ultraviolet absorber (Tinuvin 384-2) 5 parts, light stabilizer (Tinuvin 292) 5 parts, and mixed uniformly.

[0188] The first protective layer comprises the following raw materials by weight parts: alkoxylated phenol acrylate (SR9087) 25 parts, trimethylolpropane triacrylate (SR351 NS) 20 parts, aromatic polyurethane acrylate (CN9167) 25 parts, adhesion promoter Silquest A-1170 2 parts, leveling agent BYK333 3 parts and isopropyl alcohol 40 parts.

[0189] The second protective layer comprises the following raw materials by weight parts: isobornyl acrylate (SR506 NS) 15 parts, ethoxylated bisphenol A dimethacrylate (SR150) 15 parts, dipentaerythritol hexaacrylate (DPHA NS) 30 parts, aromatic polyurethane acrylate (CN9165) 25 parts, photoinitiator Darocur 651 4 parts, adhesion promoter BYK-4509 1 part, leveling agent BYK348 3 parts and methyl isobutyl ketone 40 parts by weight.

[0190] The preparation method of the hinge film comprises the following steps:

[0191] (1) After mixing the components of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 150°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1500 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and cooled on the guide roller;

[0192] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0193] Example 15

[0194] A hinge film, comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0195] The intermediate layer comprises the following components by weight parts: block copolymer (LA2250) 70 parts, antioxidant (Irganox 1010) 5 parts, ultraviolet absorber (Tinuvin 460) 5 parts, light stabilizer (Tinuvin 292) 5 parts.

[0196] The first protective layer comprises the following raw materials by weight parts: aliphatic polyurethane acrylate (CN9100NS) 25 parts by weight, 1,6-hexanediol dimethacrylate (SR239 NS) 55 parts by weight, adhesion promoter Silquest A-1170 3 parts, leveling agent BYK333 1 part and isopropyl alcohol 40 parts.

[0197] The second protective layer comprises the following raw materials by weight parts: trimethylolpropane triacrylate (SR351 NS) 30 parts, polyurethane acrylate (CN978 NS) 45 parts, photoinitiator hydroxymethyl phenyl ketone 4 parts, adhesion promoter Silquest A-1170 3 parts and isopropyl alcohol 40 parts by weight.

[0198] The preparation method of the hinge film comprises the following steps:

[0199] (1) After mixing the components of the intermediate layer, the mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 160°C and conveyed to the co-extrusion die 1 with an extrusion gap of 500 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and cooled on the guide roller;

[0200] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0201] Example 16

[0202] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0203] The intermediate layer comprises the following components by weight parts: block copolymer (LA4285) 50 parts, antioxidant (Irganox 168) 5 parts, ultraviolet absorber (Tinuvin 477) 5 parts, light stabilizer (Tinuvin 292) 5 parts.

[0204] The first protective layer comprises the following raw materials by weight parts: stearyl acrylate (SR257) 25 parts by weight, polyurethane acrylate (CN978 NS) 35 parts, 1,6-hexanediol dimethacrylate (SR239 NS) 10 parts by weight, adhesion promoter Silquest A-1170 2 parts, leveling agent BYK333 3 parts and butyl acetate 40 parts.

[0205] The second protective layer comprises the following raw materials by weight parts: hexalactone acrylate (SR495B NS) 15 parts, 1,3-butanediol dimethacrylate (SR297) 25 parts, dipentaerythritol pentaacrylate (SR399) 20 parts, polyurethane acrylate (CN8885 NS) 25 parts, photoinitiator 2,4-dihydroxybenzophenone 5 parts, adhesion promoter Silquest A-186 2 parts, leveling agent TEGO GLIDE 425 3 parts and isopropyl alcohol 40 parts.

[0206] The preparation method of the hinge film comprises the following steps:

[0207] (1) After mixing the components of the intermediate layer, the mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 160°C and conveyed to the co-extrusion die 1 with an extrusion gap of 700 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide roller;

[0208] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0209] Example 17

[0210] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0211] The intermediate layer comprises the following components by weight parts: block copolymer (LA4285) 70 parts, antioxidant (Irganox 500) 5 parts, ultraviolet absorber (Tinuvin 900) 5 parts, light stabilizer (Tinuvin 292) 5 parts.

[0212] The first protective layer comprises the following raw materials by weight parts: 2(2-ethoxy)ethyl acrylate (SR256) 20 parts, neopentyl glycol diacrylate (SR247) 20 parts, polyurethane acrylate (CN972) 20 parts, (9) ethoxylated trimethylolpropane triacrylate (SR502 NS) 10 parts, photoinitiator 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester 3 parts, adhesion promoter Silquest A-1170 1 part, leveling agent BYK333 3 parts and ethyl acetate 40 parts.

[0213] The second protective layer comprises the following raw materials by weight parts: hexalactone acrylate (SR495B NS) 5 parts by weight, 1,3-butanediol dimethacrylate (SR297) 5 parts by weight, dipentaerythritol pentaacrylate (SR399) 25 parts by weight, polyurethane acrylate (CN8885 NS) 20 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 5 parts by weight, leveling agent TEGO GLIDE 425 3 parts by weight and isopropyl alcohol 35 parts by weight.

[0214] The preparation method of the hinge film comprises the following steps:

[0215] (1) After mixing the components of the intermediate layer, the mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 170°C and conveyed to the co-extrusion die 1 with an extrusion gap of 500 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide roller;

[0216] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0217] Example 18

[0218] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer stacked in sequence; the thickness of each layer is shown in Table 1.

[0219] The intermediate layer comprises the following components by weight parts: block copolymer (LB550) 50 parts by weight, antioxidant (Irganox 1135) 5 parts by weight, ultraviolet absorber (Tinuvin 928) 5 parts by weight, light stabilizer (Tinuvin 292) 5 parts by weight.

[0220] The first protective layer comprises the following raw materials by weight parts: 2(2-ethoxy)ethyl acrylate (SR256) 10 parts by weight, neopentyl glycol diacrylate (SR247) 20 parts by weight, (9) ethoxylated trimethylolpropane triacrylate (SR502 NS) 60 parts by weight, photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone 4 parts by weight, adhesion promoter Silquest A-1170 3 parts by weight and isopropyl alcohol 38 parts by weight.

[0221] The second protective layer comprises the following raw materials by weight parts: hexylolactone acrylate (SR495B NS) 25 parts by weight, 1,3-butanediol dimethacrylate (SR297) 20 parts by weight, dipentaerythritol pentaacrylate (SR399) 15 parts by weight, polyurethane acrylate (CN8885 NS) 15 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 5 parts by weight, adhesion promoter Silquest A-186 3 parts by weight, leveling agent TEGO GLIDE 425 2 parts by weight and isopropyl alcohol 38 parts by weight.

[0222] The method for preparing the hinge film comprises the following steps:

[0223] (1) After mixing the components of the intermediate layer, the mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 160°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1200 μm. The distance between the co-extrusion die 1 and the gap between the calender rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calender, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide roller;

[0224] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0225] Example 19

[0226] A hinge film comprising a first protective layer, an intermediate layer and a second protective layer arranged in sequence; the thickness of each layer is shown in Table 1.

[0227] The intermediate layer comprises the following components by weight parts: block copolymer (LM730H) 50 parts by weight, antioxidant (Irganox MD 1024) 5 parts by weight, ultraviolet absorber (Tinuvin 1130) 5 parts by weight, light stabilizer (Tinuvin 292) 5 parts by weight.

[0228] The first protective layer comprises the following raw materials by weight parts: methoxy polyethylene glycol monomethacrylate (SR550) 10 parts by weight, 1,6-hexanediol diacrylate (SR238 NS) 25 parts by weight, (20) ethoxylated trimethylolpropane triacrylate (SR415) 25 parts by weight, aliphatic polyurethane acrylate (CN310 NS) 10 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 4 parts by weight, adhesion promoter Silquest A-1170 2 parts by weight, leveling agent BYK333 1 part by weight and isopropyl alcohol 38 parts by weight.

[0229] The second protective layer includes the following preparation raw materials by weight parts: hexalactone acrylate (SR495B NS) 15 parts by weight, 1,3-butanediol dimethacrylate (SR297) 15 parts by weight, dipentaerythritol pentaacrylate (SR399) 25 parts by weight, polyurethane acrylate (CN8885 NS) 15 parts by weight, photoinitiator 2,4-dihydroxybenzophenone 5 parts by weight, adhesion promoter Silquest A-186 1 part by weight, leveling agent TEGO GLIDE 425 2 parts by weight, and isopropyl alcohol 38 parts by weight.

[0230] The preparation method of the hinge film comprises the following steps:

[0231] (1) After mixing each component of the intermediate layer, the obtained mixture is conveyed to the feed hopper of the extruder through the dryer on the Extrusion line Breyer OptiFlex production line, and the mixture is heated and melted in the plasticizing device composed of the cylinder / screw of the extruder at 170°C and conveyed to the co-extrusion die 1 with an extrusion gap of 1500 μm. The distance between the co-extrusion die 1 and the gap between the calendering rollers 2a and 2b is 20 cm, and the melt extruded from the co-extrusion die 1 reaches the calendering machine, and the intermediate layer is calendered, shaped and temperature-controlled and cooled on the guide roller;

[0232] (2) This step is the same as Example 1, and the specific process parameters are shown in Table 1.

[0233] Example 20

[0234] A hinge film and a preparation method thereof, which are different from Example 1 only in that the components of the intermediate layer do not include antioxidants, ultraviolet absorbers and light stabilizers, and the rest are the same as Example 1.

[0235] Example 21

[0236] A hinge film and a preparation method thereof, which are different from Example 1 only in that the thicknesses of the first protective layer and the second protective layer are 1 μm respectively, and the rest are the same as Example 1.

[0237] Example 22

[0238] A hinge film and a preparation method thereof, which are different from Example 1 only in that the thicknesses of the first protective layer and the second protective layer are both 3 μm, and the rest are the same as Example 1.

[0239] Example 23

[0240] A hinge film and a preparation method thereof, which are different from Example 1 only in that the thickness of the second protective layer is 150 μm, and the rest are the same as Example 1.

[0241] Example 24

[0242] A hinge film and a method for preparing the same according to Example 1, except that the thickness of the intermediate layer is 2500 μm, and the rest are the same as Example 1.

[0243] Example 25

[0244] A hinge film and a method for preparing the same according to Example 1, except that the thickness of the intermediate layer is 2 μm, and the rest are the same as Example 1.

[0245] Example 26

[0246] A hinge film and a method for preparing the same according to Example 1, except that the temperature of melting in step (1) is 120 °C, and the rest are the same as Example 1.

[0247] Example 27

[0248] A hinge film and a method for preparing the same according to Example 1, except that the temperature of melting in step (1) is 190 °C, and the rest are the same as Example 1.

[0249] Example 28

[0250] A hinge film and a method for preparing the same according to Example 1, except that the intensity of radiation for ultraviolet curing of the first protective layer is 50 mJ / cm 2 , and the rest are the same as Example 1.

[0251] Example 29

[0252] A hinge film and a method for preparing the same according to Example 1, except that the intensity of radiation for ultraviolet curing of the first protective layer is 2000 mJ / cm 2 , and the rest are the same as Example 1.

[0253] Example 30

[0254] A hinge film and a method for preparing the same according to Example 1, except that the intensity of radiation for ultraviolet curing of the second protective layer is 50 mJ / cm 2 , and the rest are the same as Example 1.

[0255] Example 31

[0256] A hinge film and a method for preparing the same according to Example 1, except that the intensity of radiation for ultraviolet curing of the second protective layer is 2000 mJ / cm 2 , and the rest are the same as Example 1.

[0257] Comparative Example 1

[0258] A hinge film and a method for preparing the same, which is identical to Example 1 except that there is no first protective layer.

[0259] Comparative Example 2

[0260] A hinge film and a method for preparing the same, which is identical to Example 1 except that the component block copolymer (LA2140) of the intermediate layer is replaced with polyurethane in equal amount.

[0261] Comparative Example 3

[0262] A hinge film which is identical to Example 1 except that there is no second protective layer.

[0263] Table 1

[0264]

[0265]

[0266] Performance Test:

[0267] (1) Pencil hardness: tested by ASTM D3363, only the pencil hardness of the first protective layer and the second protective layer was tested;

[0268] (2) Adhesion: tested by ASTM D3359, only the adhesion of the surface of the first protective layer and the second protective layer was tested;

[0269] (3) Weather resistance: tested by a xenon lamp weather resistance test box (JUHUA INSTRUMENTS / HENGMU INSTRUMENTS CO., LTD., JW-1101) for the yellowness index b, test conditions: radiation intensity 0.68 W / m 2 , temperature 60℃, time 168 hours;

[0270] Δb was used to represent the weather resistance of the sample, Δb = (b 最终 -b 初始 )b 初始 ; wherein b 最终 is the yellowness index of the sample after 168 hours, b 初始 is the yellowness index before the test;

[0271] (4) Solvent resistance: a solvent (water, ethanol, methyl isopropyl ketone) was dipped with a dust-free cloth or a paper towel, and the coating film was wiped 50 times, and whether the coating was damaged was observed, no damage was pass, damage was fail, only the surface of the first protective layer and the second protective layer was tested for solvent resistance;

[0272] (5) The multi-layer structure was observed by a scanning electron microscope (Japan, Hitachi S-4800).

[0273] The hinge films provided by Examples 1-31 and Comparative Examples 1-3 were tested according to the above test methods, and the test results are shown in Table 2.

[0274] Table 2

[0275]

[0276]

[0277]

[0278] Note: "√" in Table 2 means pass; "-" means no test data.

[0279] From the comparison between Example 1 and Examples 20-31, it can be seen that the components of the intermediate layer do not contain antioxidants, ultraviolet absorbers and light stabilizers, which will make the weather resistance of the hinge film worse. The thicknesses of the first protective layer and the second protective layer are 1 μm, respectively, which makes the first protective layer and the second protective layer lose adhesion. The thicknesses of the first protective layer and the second protective layer are 3 μm and 3 μm, respectively, which makes the first protective layer and the second protective layer lose adhesion and also lose ideal mechanical properties. The thickness of the second protective layer is 150 μm, which makes the second protective layer lose adhesion; the thickness of the intermediate layer is 2500 μm, which makes the intermediate layer fail to complete extrusion molding; the thickness of the intermediate layer is 2 μm, which makes the hardness of the first protective layer and the second protective layer decrease. The melting temperature of the intermediate layer is 120℃, which makes the first protective layer fail to be formed. The melting temperature of the intermediate layer is 190℃, which makes the first protective layer fail to be formed. The radiation intensity of the ultraviolet curing of the first protective layer coating is 50 mJ / cm 2 , which makes the pencil hardness of the first protective layer decrease and the adhesion lose. The radiation intensity of the ultraviolet curing of the first protective layer coating is 2000 mJ / cm 2 , which makes the adhesion of the first protective layer lose. The radiation intensity of the ultraviolet curing of the second protective layer coating is 50 mJ / cm 2 , which makes the pencil hardness of the second protective layer decrease and the adhesion lose. The radiation intensity of the ultraviolet curing of the second protective layer coating is 2000 mJ / cm 2 , which makes the adhesion of the second protective layer lose.

[0280] From the comparison between Example 1 and Comparative Examples 1-3, it can be seen that not setting the first protective layer or the second protective layer will make the hardness of the hinge film decrease; using a block copolymer having a polymethacrylate block and a polyacrylate block as the component of the intermediate layer relative to polyurethane, the hardness of the hinge film is higher and the adhesion is better.

[0281] Applicant states that the detailed process flow of the present application is illustrated by the above-mentioned examples, but the present application is not limited to the above-mentioned detailed process flow, i.e. it does not mean that the present application must rely on the above-mentioned detailed process flow to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A hinge film, characterized by, The hinge film comprises a first protective layer, an intermediate layer and a second protective layer which are sequentially stacked; The components of the intermediate layer comprise a block copolymer having a polymethacrylate block and a polyacrylate block, an antioxidant, an ultraviolet absorber and a light stabilizer; The first protective layer and the second protective layer each independently comprise, in parts by weight, a resin preparation raw material 20-90 parts by weight, a photoinitiator 3-6 parts by weight, an auxiliary 0-8 parts by weight and a solvent 30-40 parts by weight; The resin preparation raw material comprises an acrylate monomer and / or an acrylate oligomer; The thickness of the intermediate layer is 5-2000 μm; The preparation method of the hinge film comprises the following steps: (1) mixing a block copolymer having a polymethacrylate block and a polyacrylate block, an antioxidant, an ultraviolet absorber and a light stabilizer, sequentially performing melting, co-extrusion and shaping to obtain the intermediate layer; (2) mixing the preparation raw material of the first protective layer and coating it on one side of the intermediate layer, mixing the preparation raw material of the second protective layer and coating it on the other side of the intermediate layer, and curing the surface coating of the intermediate layer to obtain the hinge film; The temperature of the melting is 130-170℃; The curing method comprises ultraviolet curing; The intensity of the ultraviolet light curing radiation is 100-1500 mJ / cm 2 ; The block copolymer having a polymethacrylate block and a polyacrylate block has a melt index of 0.5-40 g / 10 min at 190℃ under a load of 2.16 kg; The block copolymer having a polymethacrylate block and a polyacrylate block comprises any one or a combination of at least two of a diblock copolymer having a polymethacrylate block and a polyacrylate block, a triblock copolymer having a polymethacrylate block and a polyacrylate block, a tetrablock copolymer having a polymethacrylate block and a polyacrylate block, a star-shaped block copolymer having a polymethacrylate block and a polyacrylate block, or a branched block copolymer having a polymethacrylate block and a polyacrylate block; The glass transition temperature of the polymethacrylate block is 100-120℃; The glass transition temperature of the polyacrylate block is -40 to -50℃; The block copolymer having a polymethacrylate block and a polyacrylate block in the intermediate layer is 40-70 parts by weight, the antioxidant is 1-5 parts by weight, the ultraviolet absorber is 1-5 parts by weight, and the light stabilizer is 1-5 parts by weight, all in parts by weight; The thickness of the first protective layer and the second protective layer is independently 5-100 μm; The viscosity of the acrylate oligomer is 400-20000 cPs / 25℃; The auxiliary comprises an adhesion promoter and / or a leveling agent; The adhesion promoter in the auxiliary is 0-3 parts by weight, and the leveling agent is 0-5 parts by weight, both in parts by weight; The solvent comprises any one or a combination of at least two of ethanol, isopropyl alcohol, ethyl acetate, butyl acetate, methyl isobutyl ketone or butanone; The coating method comprises any one of slot coating, doctor blade coating or roll coating.

2. Use of a hinge film according to claim 1, characterized in that, Use of the hinge film in passports.

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