CN112852341A - 3D (three-dimensional) under-screen fingerprint screen protection paste and preparation method thereof - Google Patents
3D (three-dimensional) under-screen fingerprint screen protection paste and preparation method thereof Download PDFInfo
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- CN112852341A CN112852341A CN202110104957.0A CN202110104957A CN112852341A CN 112852341 A CN112852341 A CN 112852341A CN 202110104957 A CN202110104957 A CN 202110104957A CN 112852341 A CN112852341 A CN 112852341A
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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
- C09J7/50—Adhesives in the form of films or foils characterised by a primer layer between the carrier and the adhesive
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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
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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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
- C09J2483/00—Presence of polysiloxane
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a 3D (three-dimensional) under-screen fingerprint screen protection paste and a preparation method thereof, and relates to the field of screen protection pastes and preparation thereof. This fingerprint screen protection subsides under 3D screen has used the multilayer material to compound, outside not influencing fingerprint unblock function under the optical screen, can also satisfy the laminating protection of all curved surface screens in the existing market. Fingerprint screen protection subsides under 3D screen includes from last to down: a protective film, a dual-cured polyurethane coating, a pyrolytic PU coating, a silica gel layer and a release film are arranged; the thickness of the upper protective film is 25-60um, the thickness of the dual-cured polyurethane coating is 5-30um, the thickness of the pyrolysis PU coating is 20-120um, and the thickness of the silica gel is 15-50 um; the pyrolysis PU coating comprises the following components in parts by weight: 80-90 parts of modified polyurethane, 10-18 parts of monomer, 3-5 parts of curing agent, 0.1-0.5 part of polymerization inhibitor, 0.5-2 parts of flatting agent and 0.1-0.3 part of defoaming agent.
Description
Technical Field
The invention relates to the field of screen protection pastes and preparation thereof, in particular to a 3D (three-dimensional) screen fingerprint protection paste and a preparation method thereof.
Background
In the coming of the 5G era, in order to achieve better impression and convenience, a mobile phone screen gradually moves from a plane to a curved screen, and a fingerprint unlocking function under a 3D optical screen is added, the screen occupation ratio is higher and higher, the radian of each mobile phone flagship screen is larger and larger, but the screen is easy to crack, and the problem that how to facilitate unlocking becomes a highlight after film pasting is solved.
Traditional 3C protection of glass tempering film, PET substrate pastes because the material is hard and the formability is poor, and the laminating nature is poor, can only use on the cell-phone of plane and little curved surface, simultaneously because optical angle, the thickness of material, and lead to the optics unblock failure of 3D screen.
The prior products have a composite structure of TPU, PC and other materials, and have a series of problems of low surface hardness, poor hand feeling, poor silica gel adhesion force and the like, so that the problems are difficult to solve.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the 3D screen lower fingerprint screen protection paste which is compounded by using a multilayer material, so that the sticking protection of all curved screens in the current market can be met without influencing the unlocking function of the lower fingerprints of the optical screen.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows: the utility model provides a fingerprint screen protection subsides under 3D screen, includes from last to down: the coating comprises an upper protective film, a dual-cured polyurethane coating, a pyrolysis PU coating, a silica gel layer and a release film.
In order to further explain the 3D underscreen fingerprint screen protection sticker, the thickness of the 3D underscreen fingerprint screen protection sticker is explained, namely the thickness of the upper protection film is 25-60um, the thickness of the dual-cured polyurethane coating is 5-30um, the thickness of the pyrolytic PU coating is 20-120um, and the thickness of the silica gel is 15-50 um.
The pyrolysis PU coating comprises the following components in parts by weight: 80-90 parts of modified polyurethane, 10-18 parts of monomer, 3-5 parts of curing agent, 0.1-0.5 part of polymerization inhibitor, 0.5-2 parts of flatting agent and 0.1-0.3 part of defoaming agent.
The modified polyurethane is modified epoxy polyurethane, phenolic resin grafted polyurethane and/or modified thermoplastic polyurethane.
The monomer used in the pyrolysis PU coating is hydroxyethyl acrylate, methacrylic acid, triethanolamine, monoethanolamine and/or amino modified acrylate.
The curing agent is carbamate, polyisocyanate and/or modified diisocyanate.
The polymerization inhibitor is triethanolamine, monoethanolamine and/or tert-butylamine.
The leveling agent is modified polyether siloxane copolymer, and the defoaming agent is multi-branched unsaturated alcohol and derivatives thereof.
The pyrolysis temperature of the pyrolyzed PU coating was 180-.
The 3D underscreen fingerprint screen protection sticker provided by the invention takes a pyrolysis layer as a core, and the pyrolysis layer takes low-polyhydric alcohol with 1-4 carbon atoms as an organic solvent, wherein the low-polyhydric alcohol comprises but is not limited to methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, tert-butanol or a combination thereof. The modified polyurethane used in the invention has better heat resistance, is high in strength and filmlike at normal temperature, can be gradually softened at high temperature and is easy to form, and the modified polyurethane is one or a combination of more of modified epoxy polyurethane, phenolic resin grafted polyurethane, modified thermoplastic polyurethane and the like; the monomer is used as an auxiliary material for adjusting the reaction degree of polyurethane, and is one or a combination of hydroxyethyl acrylate, methacrylic acid and amino modified acrylate; the curing agent is one or more of carbamate, polyisocyanate and modified diisocyanate; the polymerization inhibitor is used for preventing the polyurethane resin from being too violent in the reaction process, and comprises but is not limited to one or the combination of more of triethanolamine, monoethanolamine and tert-butylamine; the leveling agent is a modified polyether siloxane copolymer; the defoaming agent is one or a combination of more than one of multi-branched unsaturated alcohol and derivatives thereof.
The invention also provides a preparation method of the 3D underscreen fingerprint screen protection paste, which is simple in production process and high in product yield, and comprises the following steps:
step 1): coating the pyrolytic PU coating liquid on the surface of a release film, and forming a semi-finished product a formed by combining the pyrolytic PU coating film and the release film after thermosetting;
step 2): coating the double-cured polyurethane coating liquid on the surface of the pyrolysis PU coating of the semi-finished product a obtained in the step 1), and curing to form a double-cured polyurethane coating;
step 3): covering an upper protective film on the dual-cured polyurethane coating obtained in the step 2);
step 4): tearing the release film, coating silica gel on the surface of the PU layer of the pyrolysis PU coating composite film, and curing to form a silica gel layer; attaching a release film on the surface of the silica gel to form a semi-finished product b;
step 5): carrying out hot press molding on the semi-finished product b obtained in the step 4) to form a 3D semi-finished product c;
step 6): and C), carrying out CNC cutting on the 3D semi-finished product c obtained in the step 5), carrying out UV illumination, and shaping to obtain the 3D underscreen fingerprint protection sticker.
The pyrolytic PU coating of the fingerprint screen protection sticker under the 3D screen is in a dry state on the surface in an environment at the temperature of less than 60 ℃, and can be coated with silica gel and acrylic gel.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the 3D underscreen fingerprint protection sticker provided by the invention takes a pyrolysis PU coating as a core layer and is combined with a dual-curing coating as an intermediate layer;
(2) the base film coating has good optical performance without the problems of rainbow lines and interference lines, and the use of the fingerprint unlocking function under the light sensation screen is not influenced; the material has excellent formability and is suitable for serving as a base material of a 3D screen protection sticker;
(3) the pyrolytic PU coating has high light transmittance which is more than 90 percent, and the use of the fingerprint unlocking function under the light-sensitive screen cannot be influenced; in addition, the outer surface of the 3D screen protection paste has good hardness (2H/500G, JIS5600) due to the dual-curing coating, so that scratch-resistant and wear-resistant functions are well realized, and the problems that a PC base film and a PC/PMMA base film are soft in material and cannot resist scratch in independent application are solved; meanwhile, the polyurethane coating also enables the outer surface of the 3D screen protection paste to have good anti-pollution capacity (the water feeler is 105 degrees), so that the anti-fingerprint function is realized; obtaining better sliding operation touch feeling;
(4) the 3D underscreen fingerprint screen protector thoroughly overcomes the technical defects of soft material surface, scratch resistance, large-radian screen attaching and edge warping and the like, and has the advantages of no phase difference, good formability, good universality and the like.
Detailed Description
The present invention will now be described more clearly and completely with reference to the following examples, which are intended to illustrate some, but not all, of the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Fingerprint screen protection subsides under 3D screen that this embodiment provided include from last to down polyurethane coating, pyrolysis PU coating, silica gel layer and from type membrane of protection film, dual curing.
Wherein the pyrolysis layer consists of the following components in parts by weight: 85 parts of modified polyurethane (modified thermoplastic polyurethane), 8 parts of monomer (amino modified acrylate), 3.2 parts of curing agent (modified diisocyanate), 2 parts of polymerization inhibitor (monoethanolamine), 1.5 parts of flatting agent (modified polyether siloxane copolymer) and 0.5 part of defoaming agent (branched chain unsaturated alcohol).
The preparation method comprises the following steps:
step 1): and sequentially adding the pyrolytic coatings according to the formula proportion, and uniformly stirring to obtain the pyrolytic coating.
Step 2): coating the prepared pyrolytic coating on a release film by using a slit coating, baking in a baking oven, wherein the highest temperature of the baking oven is 120 ℃, the drying speed is 10m/min, the thickness of the coating is 80 mu m, and rolling.
Step 3): taking the semi-finished product obtained in the step 2) as a base film, coating a dual-curing polyurethane coating on the surface of the pyrolysis coating, covering a protective film on the surface of the dual-curing polyurethane coating, rolling to obtain a functional layer semi-finished product, and curing for 48 hours in a dark place.
Step 4): removing the release film from the cured semi-finished product obtained in the step 3), coating silica gel on the surface of the pyrolysis coating, and attaching the release film to the silica gel surface to obtain a finished product.
Step 5): and (4) dividing the finished product into strips, cutting the strips into sheets, and performing hot press molding to obtain the finished product with the 3D radian.
Step 6): and (3) performing CNC cutting on the product with the 3D radian, after laminating, irradiating for 5s by using 500-800mj of UV light, and curing and shaping.
After the 3D screen lower fingerprint screen protector prepared by the embodiment is pasted on the surface of a mobile phone, the setting property is good, the gray edge is not easy to appear, the edge is raised, and the surface effect is good.
Example 2
Fingerprint screen protection subsides under 3D screen that this embodiment provided include from last to down polyurethane coating, pyrolysis PU coating, silica gel layer and from type membrane of protection film, dual curing.
Wherein the pyrolysis layer consists of the following components in parts by weight: 80 parts of modified polyurethane (modified thermoplastic polyurethane), 15 parts of monomer (polyisocyanate), 2 parts of curing agent (monoethanolamine), 2 parts of polymerization inhibitor (monoethanolamine), 0.5 part of flatting agent (modified polyether siloxane copolymer) and 0.5 part of defoaming agent (branched chain unsaturated alcohol).
The preparation method comprises the following steps:
step 1): and sequentially adding the pyrolytic coatings according to the formula proportion, and uniformly stirring to obtain the pyrolytic coating.
Step 2): coating the prepared pyrolytic coating on a release film by using a slit coating, baking in a baking oven, wherein the highest temperature of the baking oven is 120 ℃, the drying speed is 10m/min, the thickness of the coating is 100 mu m, and rolling.
Step 3): taking the semi-finished product obtained in the step 2) as a base film, coating a dual-curing polyurethane coating on the surface of the pyrolysis coating, covering a protective film on the surface of the dual-curing polyurethane coating, rolling to obtain a functional layer semi-finished product, and curing for 48 hours in a dark place.
Step 4): removing the release film from the cured semi-finished product obtained in the step 3), coating silica gel on the surface of the pyrolysis coating, and attaching the release film to the silica gel surface to obtain a finished product.
Step 5): and (4) dividing the finished product into strips, cutting the strips into sheets, and performing hot press molding to obtain the finished product with the 3D radian.
Step 6): and (3) performing CNC cutting on the product with the 3D radian, after laminating, irradiating for 5s by using 500-800mj of UV light, and curing and shaping.
The total thickness of fingerprint screen protection subsides in use layer under the 3D screen that this embodiment made is 175um, and after laminating cell-phone surface, the ring survey is 96h at 80 ℃ and is not raised. Therefore, the 3D screen lower fingerprint screen protection paste manufactured by the embodiment has good shaping performance and good surface effect and is suitable for being used as mobile phone surface protection.
Comparative example 1
The formulation of the pyrolytic coating in comparative example 1 is different from that of example 1 in that a conventional thermoplastic acrylic resin is used and the preparation method is the same as that of example 1.
Experimental example 1 Hot Press formability test
The hot-press formability test is that a semi-finished product prepared into a sheet is hot-pressed for 10s in a 3D mould at the temperature of 180-200 ℃, so that the material is preliminarily shaped, and the material is prevented from rebounding after hot pressing, so that the finished product can be conveniently subjected to a test with a higher success rate of laminating a screen with a larger radian.
Test method and procedure
The green sheets of example 1 and comparative example 1 were placed in a 3D mold at 10pcs each, the mold was heated to 200 ℃, hot pressed for 10 seconds, and then taken out, and the molding radian and the spring back time of the sheet were checked. The radian is tested once every 3h after the high-temperature storage at 80 ℃, and the radian is continuously 24h without reduction and is qualified.
Under the same test conditions, the finished film material of example 1 can still maintain a good radian after being placed for 24 hours under the same conditions, and does not change; the material of comparative example 1 was left for 2 hours, and gradually appeared the radian and diminished, had the condition of resilience, when making next process, the laminating error appeared easily.
Therefore, for the selection of the main body thermoplastic resin, after the thermoplastic modified polyurethane is selected, the retention time after hot press molding can be greatly improved, meanwhile, the moldability of the material can be still maintained after the environment at the high temperature of 80 ℃ reaches 24 hours, and the later-stage bonding yield can be greatly improved.
Experimental example 2 test for testing product setting
The test conditions are similar to the hot-press formability test, except that the material in the comparative example 1 is subjected to the forming property test after being attached, and the attached finished product is placed for 96 hours in an environment of 80 ℃, so that the phenomenon that the product is not warped after being taken by a user for a long time in the using process is simulated.
Under the same test conditions, the finished product of example 1 was placed under these conditions for 96 hours and then observed for edge lifting using a highlight lamp; comparison 1 is also placed for 96 hours under the same environment, and the finished product in example 1 still can keep better formability after 96 hours and does not generate edge lifting, while the finished product in comparison 1 generates edge gray edges after 8 hours and has the condition of not tight jointing.
Therefore, the thermoplastic modified polyurethane is selected, so that the setting property of the product can be greatly improved, and meanwhile, the product can still keep good setting after 96 hours at the temperature of 80 ℃, so that the reliability of the product is improved.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a fingerprint screen protection subsides under 3D screen which characterized in that includes from last to down: the coating comprises an upper protective film, a dual-cured polyurethane coating, a pyrolysis PU coating, a silica gel layer and a release film.
2. The 3D underscreen fingerprint screen protection sticker of claim 1, wherein the upper protective film is 25-60um thick, the dual-cured polyurethane coating is 5-30um thick, the pyrolytic PU coating is 20-120um thick, and the silica gel is 15-50um thick.
3. The 3D underscreen fingerprint screen protection sticker according to claim 1, wherein the pyrolytic PU coating is composed of the following components in parts by weight: 80-90 parts of modified polyurethane, 10-18 parts of monomer, 3-5 parts of curing agent, 0.1-0.5 part of polymerization inhibitor, 0.5-2 parts of flatting agent and 0.1-0.3 part of defoaming agent.
4. The 3D underscreen fingerprint screen protection sticker of claim 3, wherein the modified polyurethane is a modified epoxy polyurethane, a phenolic resin grafted polyurethane, and/or a modified thermoplastic polyurethane.
5. The 3D underscreen fingerprint screen protection sticker according to claim 3, wherein the monomer is hydroxyethyl acrylate, methacrylic acid, triethanolamine, monoethanolamine, and/or amino-modified acrylate.
6. The 3D underscreen fingerprint screen protection sticker of claim 3, wherein the curing agent is a urethane, a polyisocyanate, and/or a modified diisocyanate.
7. The 3D underscreen fingerprint screen protection sticker of claim 3, wherein the polymerization inhibitor is triethanolamine, monoethanolamine, and/or tert-butylamine.
8. The 3D underscreen fingerprint screen protection sticker according to claim 3, wherein the leveling agent is a modified polyether siloxane copolymer, and the defoaming agent is a multi-branched unsaturated alcohol and a derivative thereof.
9. The 3D underscreen fingerprint screen protection sticker as claimed in claim 3, wherein the pyrolysis temperature of the pyrolysis PU coating is 180-200 ℃.
10. The method for preparing the 3D underscreen fingerprint screen protection sticker according to any one of claims 1-9, comprising the steps of:
step 1): coating the pyrolytic PU coating liquid on the surface of a release film, and forming a semi-finished product a formed by combining the pyrolytic PU coating film and the release film after thermosetting;
step 2): coating the double-cured polyurethane coating liquid on the surface of the pyrolysis PU coating of the semi-finished product a obtained in the step 1), and curing to form a double-cured polyurethane coating;
step 3): covering an upper protective film on the dual-cured polyurethane coating obtained in the step 2);
step 4): tearing the release film, coating silica gel on the surface of the PU layer of the pyrolysis PU coating composite film, and curing to form a silica gel layer; attaching a release film on the surface of the silica gel to form a semi-finished product b;
step 5): carrying out hot press molding on the semi-finished product b obtained in the step 4) to form a 3D semi-finished product c;
step 6): and C), carrying out CNC cutting on the 3D semi-finished product c obtained in the step 5), carrying out UV illumination, and shaping to obtain the 3D underscreen fingerprint protection sticker.
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| CN202110104957.0A CN112852341A (en) | 2021-01-26 | 2021-01-26 | 3D (three-dimensional) under-screen fingerprint screen protection paste and preparation method thereof |
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| CN202110104957.0A CN112852341A (en) | 2021-01-26 | 2021-01-26 | 3D (three-dimensional) under-screen fingerprint screen protection paste and preparation method thereof |
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