CN111363488A - 3D curved screen self-repairing TPU protective film and preparation method thereof - Google Patents
3D curved screen self-repairing TPU protective film and preparation method thereof Download PDFInfo
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- CN111363488A CN111363488A CN202010329106.1A CN202010329106A CN111363488A CN 111363488 A CN111363488 A CN 111363488A CN 202010329106 A CN202010329106 A CN 202010329106A CN 111363488 A CN111363488 A CN 111363488A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2475/00—Presence of polyurethane
- C09J2475/006—Presence of polyurethane in the substrate
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- Wood Science & Technology (AREA)
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- Overhead Projectors And Projection Screens (AREA)
- Adhesives Or Adhesive Processes (AREA)
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Abstract
The invention discloses a 3D curved screen self-repairing TPU protective film which comprises a release film A, an optical-grade self-repairing coating, an optical-grade hard TPU resin film layer, an optical-grade high-viscosity acrylic pressure-sensitive adhesive layer and a release film B, wherein the release film A, the optical-grade self-repairing coating, the optical-grade hard TPU resin film layer, the optical-grade high-viscosity acrylic pressure-sensitive adhesive layer; the optical-grade automatic repairing coating is formed by coating an optical-grade self-repairing coating, and the optical-grade self-repairing coating comprises the following components: 100 parts by weight of self-repairing resin, 60-150 parts by weight of first solvent, 1-10 parts by weight of slipping auxiliary agent and 30-100 parts by weight of first curing agent. The curved screen of this 3D curved surface screen selfreparing TPU protection film laminating nature is good, does not stick up, the surface is smooth, collapsible and resistant scraping flower.
Description
Technical Field
The invention relates to the technical field of screen protective films, in particular to a 3D curved screen self-repairing TPU protective film and a preparation method thereof.
Background
The current smart mobile phone has got into curved screen, folding screen era by the straight touch screen, and the touch-sensitive screen is comparatively strict to index demands such as screen breakage prevention and scraping flower, and after the screen becomes curved screen or folding screen, has also proposed higher requirement to the performance of screen protection film.
The bending radian of the 3D curved screen is larger and larger, and the traditional PET, PC, TAC and PMMA base films and the composite film of TPU cannot be well attached to the 3D curved screen. Only pure TPU film can be bent arbitrarily without bursting on a curved screen, but the TPU-based film alone is not scratch resistant. Moreover, most of the current commercially available TPU films are made by a casting method, for example, a screen protection sticker mentioned in patent CN110202901A adopts a commercially available TPU base film, the TPU film formed by the method is deficient in flatness and light transmittance, the base film is soft, and the smoothness of the later-stage surface coating is difficult to control.
Furthermore, the surface of the 3D curved screen is generally subjected to anti-fingerprint treatment, the water contact angle reaches 110-120 degrees, the surface energy of the 3D curved screen subjected to anti-fingerprint treatment is lower, the adhesive force of silica gel pressure-sensitive adhesive or acrylic acid pressure-sensitive adhesive for a traditional protective film is lower, the automatic bubble discharging effect of common pressure-sensitive adhesive on the screen is difficult to achieve, the common pressure-sensitive adhesive is difficult to be firmly attached to the screen, and the phenomenon that the cambered surface is rebounded and tilted easily occurs after the 3D curved screen is attached to the mobile phone screen. For example, the curved screen protective film mentioned in patent CN108116020A uses a silicone pressure sensitive adhesive.
In addition, with the gradually strong functions of the existing smart phone, people run a large game on the mobile phone to realize the functions of fingerprint identification, unlocking under a screen and the like, and the surface of a mobile phone protective film is required to be smooth, scratch-resistant, wear-resistant and fingerprint-resistant. In the flat screen era, the surface hardening treatment of the protective film by using the UV curing coating is a relatively conventional method, but the UV curing coating on the protective film is easy to crack on a 3D curved screen, and a better solution is to perform self-repairing coating treatment.
Therefore, the 3D curved screen self-repairing TPU protective film and the preparation method thereof are provided.
Disclosure of Invention
The invention mainly aims to provide a 3D curved screen self-repairing TPU protective film and a preparation method thereof, and the protective film has the advantages of good curved screen fitting performance, no warping, smooth surface, foldability and scratch resistance. And simple structure, low in manufacturing cost can prepare the TPU protection film that is fit for 3D curved surface screen, and the protection effect is good fast.
In order to achieve the purpose, the invention provides a 3D curved screen self-repairing TPU protective film which comprises a release film A, an optical-grade self-repairing coating, an optical-grade hard TPU resin film layer, an optical-grade high-viscosity acrylic pressure-sensitive adhesive layer and a release film B, wherein the release film A, the optical-grade self-repairing coating, the optical-grade hard TPU resin film layer, the optical-grade high-viscosity acrylic pressure-sensitive;
the optical-grade automatic repairing coating is formed by coating an optical-grade self-repairing coating, and the optical-grade self-repairing coating comprises the following components: wherein the thickness range of the optical-grade automatic repair coating is 5-30 μm.
100 parts by weight of self-repairing resin, 60-150 parts by weight of first solvent, 1-10 parts by weight of slipping auxiliary agent and 30-100 parts by weight of first curing agent.
Preferably, the self-repairing resin is one or more of polyhydroxy acrylate, polyhydroxy polyurethane acrylate, polyhydroxy silicon modified acrylate and polyhydroxy fluorine modified acrylate; the first solvent is one or more of ethyl acetate, n-butyl acetate, toluene, propylene glycol monomethyl ether acetate and butanone; the slipping auxiliary agent is one or more of a fluorine-containing leveling agent, a silicon-containing leveling agent and a fluorine-silicon leveling agent; the first curing agent is a dimer or trimer of hexamethylene diisocyanate.
Preferably, the release film A and the release film B are silicone oil release films with PET base materials, and the thickness ranges of the release film A and the release film B are both 20-60 mu m.
Preferably, the optical-grade hard TPU resin film layer is formed by coating optical-grade hard TPU glue, and the optical-grade hard TPU glue is formed by polymerizing polyisocyanate, polyester polyol and a chain extender in a second solvent under the action of a catalyst; the thickness range of the optical-grade hard TPU resin film layer is 50-200 mu m.
Preferably, the polyisocyanate is one or more of hexamethylene diisocyanate or polymers thereof, isophorone diisocyanate or polymers thereof; the polyester polyol is one or more of conventional polyester polyol, polycaprolactone polyol and polycarbonate diol; the chain extender is one or more of ethylene glycol, 1, 4-butanediol, 1, 6-hexanediol, glycerol and trimethylolpropane; the catalyst is dibutyltin dilaurate; the second solvent is one or more of ethyl acetate, toluene, butanone and N, N-dimethylformamide.
Preferably, the optical high-viscosity acrylic pressure-sensitive adhesive layer is formed by coating optical high-viscosity acrylic pressure-sensitive adhesive, and the optical high-viscosity acrylic pressure-sensitive adhesive is formed by polymerizing 100 parts by weight of acrylic soft monomer, 10-30 parts by weight of acrylic hard monomer and 3-10 parts by weight of hydroxy acrylic monomer in a third solvent under the action of an initiator; the thickness range of the optical high-viscosity acrylic pressure-sensitive adhesive layer is 15-40 mu m.
Preferably, the acrylic acid soft monomer is two or more of n-butyl acrylate, ethyl acrylate, isooctyl acrylate, lauryl acrylate and lauryl methacrylate; the acrylic acid hard monomer is two or more of acrylic acid, methacrylic acid, methyl methacrylate, vinyl acetate, acrylamide, isobornyl acrylate and glycidyl methacrylate; the hydroxyl acrylic monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; the initiator is one or more of azodiisobutyronitrile, azodiisoheptonitrile, dibenzoyl peroxide and lauroyl peroxide; the third solvent is one or more of ethyl acetate, toluene, acetone and cyclohexane.
Preferably, in the coating process, 0.1-2% of a second curing agent is added into the optical high-viscosity acrylic pressure-sensitive adhesive, and the second curing agent is a dimer or trimer of hexamethylene diisocyanate.
Preferably, the light transmittance of the 3D curved screen self-repairing TPU protective film is greater than 90%, the haze is less than 1%, the water contact angle reaches more than 105 degrees, and the dynamic friction coefficient is less than 0.2.
A preparation method of a 3D curved screen self-repairing TPU protective film comprises the following steps:
(1) coating optical-grade hard TPU glue on the PET release film C, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer; by blade coating or slot coating.
(2) Coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at the temperature of 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer, and covering a release film B on the optical high-viscosity acrylic pressure-sensitive adhesive layer;
(3) tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at the temperature of 80-110 ℃ to form an optical-grade self-repairing coating, covering the release film A on the surface of the self-repairing coating, rolling, placing at the temperature of 50-60 ℃ for curing for 48-72 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
Compared with the prior art, the invention has the following beneficial effects:
1. the TPU material is adopted as the base film, so that the optical performance is better, and rainbow lines and interference lines are avoided. In the invention, a commercially available TPU resin film layer prepared by a tape casting method is not adopted, optical-grade hard TPU glue is synthesized firstly, and then a coating machine is used for coating the TPU base film. The single-layer base film has a simple structure, does not need a hot bending process, and has low preparation cost; the thickness is adjustable, the hardness of the film material is adjustable, the surface flatness is high, the uniformity of the thickness of the film material is good, and the flexibility and the laminating property of the curved-surface screen are considered.
2. One surface of the protective film, which is adhered to the 3D curved screen, is coated with optical-grade high-viscosity acrylic pressure-sensitive glue, and silica gel pressure-sensitive glue is not used, so that the problem that silica gel is difficult to directly coat on a TPU (thermoplastic polyurethane) base film is solved, and the protective film and the 3D curved screen subjected to fingerprint prevention treatment can be firmer; and the fluorine release film with high manufacturing cost is not used for being adhered with the acrylic pressure-sensitive adhesive, so that the cost is low.
3. The surface of the protective film is coated with the optical-grade self-repairing coating, so that the problem that a TPU (thermoplastic polyurethane) base film is not resistant to scratching when used alone is solved, the TPU base film can be quickly self-repaired even if small scratches exist, and the self-repairing coating is good in flexibility and can be bent randomly. In addition, the slipping auxiliary agent added in the self-repairing coating can enable the outer surface of the protective film to have good anti-fouling capacity and anti-fingerprint performance, the water contact angle reaches more than 105 degrees, the dynamic friction coefficient is less than 0.2, and good slipping operation touch feeling is obtained.
4. The preparation method is simple and easy to realize, can quickly produce the 3D curved screen self-repairing TPU protective film product with good protection effect and good comprehensive performance, and has high production efficiency.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
The optical-grade self-repairing coating comprises the following components: 100 parts by weight of polyhydroxy acrylate, 60 parts by weight of ethyl acetate, 1 part by weight of fluorine-containing leveling agent and 30 parts by weight of dimer of hexamethylene diisocyanate;
the optical-grade hard TPU glue is prepared from hexamethylene diisocyanate, polyester polyol and ethylene glycol according to a molar ratio of 1: 0.9: 0.1, and polymerizing in toluene under the catalytic action of dibutyltin dilaurate;
the optical-grade high-viscosity acrylic pressure-sensitive adhesive is prepared by polymerizing 100 parts by weight of n-butyl acrylate, 10 parts by weight of acrylic acid and 3 parts by weight of hydroxyethyl acrylate in acetone under the catalytic action of azobisisobutyronitrile; 0.2 part by weight of a dimer of hexamethylene diisocyanate was also added.
The preparation method of the 3D curved screen self-repairing TPU protective film comprises the following steps:
coating optical-grade hard TPU glue on a PET release film C with the thickness of 25 mu m, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer with the thickness of 50 mu m; coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer with the thickness of 25 mu m, and covering a release film B with the thickness of 25 mu m on the optical high-viscosity acrylic pressure-sensitive adhesive layer; tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at 80-110 ℃ to form an optical-grade self-repairing coating with the thickness of 25 microns, covering the release film A with the thickness of 25 microns on the surface of the self-repairing coating, rolling, placing at 50 ℃ for curing for 72 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
Example 2
The optical-grade self-repairing coating comprises the following components: 100 parts by weight of polyhydroxy polyurethane acrylate, 150 parts by weight of n-butyl acetate, 10 parts by weight of a silicon-containing leveling agent and 100 parts by weight of a dimer of hexamethylene diisocyanate;
the optical-grade hard TPU glue is prepared from isophorone diisocyanate, polycaprolactone polyol and 1, 4-butanediol according to a molar ratio of 1: 0.8: 0.2, and polymerizing in N, N-dimethylformamide under the catalytic action of dibutyltin dilaurate;
the optical-grade high-viscosity acrylic pressure-sensitive adhesive is prepared by polymerizing 100 parts by weight of ethyl acrylate, 30 parts by weight of methacrylic acid and 10 parts by weight of hydroxypropyl acrylate in cyclohexane under the catalytic action of azodiisoheptanonitrile; 2 parts by weight of a dimer of hexamethylene diisocyanate were also added.
The preparation method of the 3D curved screen self-repairing TPU protective film comprises the following steps:
coating optical-grade hard TPU glue on a PET release film C with the thickness of 25 mu m, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer with the thickness of 50 mu m; coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer with the thickness of 30 micrometers, and covering a release film B with the thickness of 25 micrometers on the optical high-viscosity acrylic pressure-sensitive adhesive layer; tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at 80-110 ℃ to form an optical-grade self-repairing coating with the thickness of 15 microns, covering the release film A with the thickness of 25 microns on the surface of the self-repairing coating, rolling, placing at 50 ℃ for curing for 72 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
Example 3
The optical-grade self-repairing coating comprises the following components: 100 parts by weight of polyhydroxy acrylate, 60 parts by weight of ethyl acetate, 1 part by weight of fluorine-containing leveling agent and 30 parts by weight of dimer of hexamethylene diisocyanate;
the optical-grade hard TPU glue is prepared from hexamethylene diisocyanate, polyester polyol and ethylene glycol according to a molar ratio of 1: 0.85: 0.15 of a mixture and polymerized in toluene by the catalytic action of dibutyltin dilaurate;
the optical-grade high-viscosity acrylic pressure-sensitive adhesive is prepared by polymerizing 100 parts by weight of n-butyl acrylate, 10 parts by weight of acrylic acid and 3 parts by weight of hydroxyethyl acrylate in acetone under the catalytic action of azobisisobutyronitrile; 0.2 part by weight of a dimer of hexamethylene diisocyanate was also added.
The preparation method of the 3D curved screen self-repairing TPU protective film comprises the following steps:
coating optical-grade hard TPU glue on a PET release film C with the thickness of 50 mu m, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer with the thickness of 200 mu m; coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer with the thickness of 40 mu m, and covering a release film B with the thickness of 50 mu m on the optical high-viscosity acrylic pressure-sensitive adhesive layer; tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at 80-110 ℃ to form an optical-grade self-repairing coating with the thickness of 30 microns, covering the release film A with the thickness of 50 microns on the surface of the self-repairing coating, rolling, placing at 60 ℃ for curing for 48 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
Example 4
The optical-grade self-repairing coating comprises the following components: 100 parts by weight of polyhydroxy polyurethane acrylate, 150 parts by weight of n-butyl acetate, 10 parts by weight of a silicon-containing leveling agent and 100 parts by weight of a dimer of hexamethylene diisocyanate;
the optical-grade hard TPU glue is prepared from isophorone diisocyanate, polycaprolactone polyol and 1, 4-butanediol according to a molar ratio of 1: 0.92: 0.08 and polymerized in N, N-dimethylformamide under the catalytic action of dibutyltin dilaurate;
the optical-grade high-viscosity acrylic pressure-sensitive adhesive is prepared by polymerizing 100 parts by weight of ethyl acrylate, 30 parts by weight of methacrylic acid and 10 parts by weight of hydroxypropyl acrylate in cyclohexane under the catalytic action of azodiisoheptanonitrile; 2 parts by weight of a trimer of hexamethylene diisocyanate were also added.
The preparation method of the 3D curved screen self-repairing TPU protective film comprises the following steps:
coating optical-grade hard TPU glue on a PET release film C with the thickness of 38 mu m, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer with the thickness of 200 mu m; coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer with the thickness of 35 mu m, and covering a release film B with the thickness of 38 mu m on the optical high-viscosity acrylic pressure-sensitive adhesive layer; tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at 80-110 ℃ to form an optical-grade self-repairing coating with the thickness of 30 microns, covering the release film A with the thickness of 38 microns on the surface of the self-repairing coating, rolling, placing at 60 ℃ for curing for 48 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
The performance test is performed on the 3D curved screen self-repairing TPU protective films prepared in the embodiments 1 to 4, and the optical performance test results of the embodiments 1 to 4 are shown in table 1:
TABLE 1
| Detecting items | Example 1 | Example 2 | Example 3 | Example 4 |
| Light transmittance | 90.8％ | 91.3％ | 91.1％ | 90.8％ |
| Haze degree | 1.0％ | 0.7％ | 0.8％ | 0.9％ |
| Speed of surface remediation | 2s | 2s | 2s | 2s |
| Surface water contact angle | 107° | 106° | 107° | 108° |
| Coefficient of dynamic friction | 0.18 | 0.19 | 0.19 | 0.17 |
| 180 degree peel force (for AF screen) | 31gf/25mm | 33gf/25mm | 33gf/25mm | 31gf/25mm |
By combining the optical performance test results in the embodiments 1 to 4, as can be seen from table 1, the light transmittance of the self-repairing TPU protective film for the 3D curved screen obtained in the embodiments 1 to 4 is greater than 90%, the haze is less than 1%, the water contact angle is more than 105 °, the dynamic friction coefficient is less than 0.2, and the touch feeling of sliding operation is increased.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The 3D curved screen self-repairing TPU protective film is characterized by comprising a release film A, an optical-grade self-repairing coating, an optical-grade hard TPU resin film layer, an optical-grade high-viscosity acrylic pressure-sensitive adhesive layer and a release film B which are attached from top to bottom;
the optical-grade automatic repairing coating is formed by coating an optical-grade self-repairing coating, and the optical-grade self-repairing coating comprises the following components:
100 parts by weight of self-repairing resin, 60-150 parts by weight of first solvent, 1-10 parts by weight of slipping auxiliary agent and 30-100 parts by weight of first curing agent.
2. The 3D curved screen self-repairing TPU protective film according to claim 1, wherein the self-repairing resin is one or more of polyhydroxy acrylate, polyhydroxy polyurethane acrylate, polyhydroxy silicon modified acrylate and polyhydroxy fluorine modified acrylate; the first solvent is one or more of ethyl acetate, n-butyl acetate, toluene, propylene glycol monomethyl ether acetate and butanone; the slipping auxiliary agent is one or more of a fluorine-containing leveling agent, a silicon-containing leveling agent and a fluorine-silicon leveling agent; the first curing agent is a dimer or trimer of hexamethylene diisocyanate.
3. The 3D curved screen self-repairing TPU protective film according to claim 1, wherein the release film A and the release film B are silicone oil release films with PET substrates, and the thickness ranges of the release film A and the release film B are both 20-60 μm.
4. The 3D curved screen self-repairing TPU protective film according to claim 1, wherein the optical-grade hard TPU resin film layer is formed by coating optical-grade hard TPU glue, and the optical-grade hard TPU glue is formed by polymerizing polyisocyanate, polyester polyol and a chain extender in a second solvent under the action of a catalyst; the thickness range of the optical-grade hard TPU resin film layer is 50-200 mu m.
5. The 3D curved screen self-repairing TPU protective film according to claim 4, wherein the polyisocyanate is one or more of hexamethylene diisocyanate or a polymer thereof, isophorone diisocyanate or a polymer thereof; the polyester polyol is one or more of conventional polyester polyol, polycaprolactone polyol and polycarbonate diol; the chain extender is one or more of ethylene glycol, 1, 4-butanediol, 1, 6-hexanediol, glycerol and trimethylolpropane; the catalyst is dibutyltin dilaurate; the second solvent is one or more of ethyl acetate, toluene, butanone and N, N-dimethylformamide.
6. The 3D curved screen self-repairing TPU protective film according to claim 1, wherein the optical grade high-viscosity acrylic pressure sensitive adhesive layer is formed by coating optical grade high-viscosity acrylic pressure sensitive adhesive, and the optical grade high-viscosity acrylic pressure sensitive adhesive is formed by polymerizing 100 parts by weight of acrylic soft monomer, 10-30 parts by weight of acrylic hard monomer, and 3-10 parts by weight of hydroxy acrylic monomer in a third solvent under the action of an initiator; the thickness range of the optical high-viscosity acrylic pressure-sensitive adhesive layer is 15-40 mu m.
7. The 3D curved screen self-repairing TPU protective film according to claim 6, wherein the soft acrylic monomer is two or more of n-butyl acrylate, ethyl acrylate, isooctyl acrylate, lauryl acrylate and lauryl methacrylate; the acrylic acid hard monomer is two or more of acrylic acid, methacrylic acid, methyl methacrylate, vinyl acetate, acrylamide, isobornyl acrylate and glycidyl methacrylate; the hydroxyl acrylic monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; the initiator is one or more of azodiisobutyronitrile, azodiisoheptonitrile, dibenzoyl peroxide and lauroyl peroxide; the third solvent is one or more of ethyl acetate, toluene, acetone and cyclohexane.
8. The 3D curved screen self-repairing TPU protective film according to claim 1, wherein in the coating process, 0.1-2% of a second curing agent is added to the optical grade high-viscosity acrylic pressure-sensitive adhesive, and the second curing agent is a dimer or trimer of hexamethylene diisocyanate.
9. The 3D curved screen self-repairing TPU protective film of claim 1, wherein the 3D curved screen self-repairing TPU protective film has a light transmittance of greater than 90%, a haze of less than 1%, a water contact angle of greater than 105 °, and a dynamic friction coefficient of less than 0.2.
10. A preparation method of a 3D curved screen self-repairing TPU protective film is characterized by comprising the following steps:
(1) coating optical-grade hard TPU glue on the PET release film C, and drying and curing at the temperature of 90-120 ℃ to form an optical-grade hard TPU resin film layer;
(2) coating optical high-viscosity acrylic pressure-sensitive adhesive on an optical hard TPU resin film layer, drying and curing at the temperature of 80-120 ℃ to form an optical high-viscosity acrylic pressure-sensitive adhesive layer, and covering a release film B on the optical high-viscosity acrylic pressure-sensitive adhesive layer;
(3) tearing off the release film C, coating the optical-grade self-repairing coating on the other surface of the optical-grade hard TPU resin film layer, drying and curing at the temperature of 80-110 ℃ to form an optical-grade self-repairing coating, covering the release film A on the surface of the self-repairing coating, rolling, placing at the temperature of 50-60 ℃ for curing for 48-72 hours after rolling, and obtaining the 3D curved screen self-repairing TPU protective film.
Priority Applications (2)
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| CN202010329106.1A CN111363488A (en) | 2020-04-23 | 2020-04-23 | 3D curved screen self-repairing TPU protective film and preparation method thereof |
| PCT/CN2021/082268 WO2021213113A1 (en) | 2020-04-23 | 2021-03-23 | Self-repairing tpu protective film for 3d curved screen and preparation method therefor |
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| CN202010329106.1A CN111363488A (en) | 2020-04-23 | 2020-04-23 | 3D curved screen self-repairing TPU protective film and preparation method thereof |
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