CN115491139A - Folding display screen explosion-proof membrane and application thereof - Google Patents

Folding display screen explosion-proof membrane and application thereof Download PDF

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Publication number
CN115491139A
CN115491139A CN202210154806.0A CN202210154806A CN115491139A CN 115491139 A CN115491139 A CN 115491139A CN 202210154806 A CN202210154806 A CN 202210154806A CN 115491139 A CN115491139 A CN 115491139A
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display screen
explosion
film
curing agent
transparent optical
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韩奎一
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Guangdong Donlee New Materials Technology Lncorporated Co
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Guangdong Donlee New Materials Technology Lncorporated Co
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • 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
    • 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
    • C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
    • 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
    • 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
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
    • 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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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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Abstract

The invention relates to an explosion-proof membrane (IPC (International patent Classification) No. CN 104293220A), in particular to a folding display screen explosion-proof membrane and application thereof. The folding display screen explosion-proof membrane prepared by the invention comprises: the surface protective film, the surface priming coat, the CPI film, the transparent optical cement layer and the release film. Therefore, the invention increases the explosion-proof and anti-falling capability of the window part of the mobile phone by coating the special acrylic acid adhesive on the CPI substrate to form a structure with more than 3 layers, has light weight and good folding resistance, and can realize more than 20 ten thousand bending times.

Description

Folding display screen explosion-proof membrane and application thereof
Technical Field
The invention relates to an explosion-proof membrane (IPC classification number: CN 104293220A), in particular to a folding display screen explosion-proof membrane and application thereof.
Background
In light of weight reduction and design of mobile phones and display screens, many thin tempered glasses have been used in these years. The tempered glass is low in manufacturing cost and weight feeling, but has a disadvantage that the tempered glass is easily damaged by external impact. In addition, with the recent popularity of the folding screen mobile phone, the danger of damage and the like caused by impact is increased with the increasing of the utilization rate of thinner folding screen toughened glass, and in addition, the explosion-proof film coated with the acrylic adhesive coating on the PET substrate is mainly used at present, but the explosion-proof film is easy to break and the like in the folding and unfolding use of tens of thousands to hundreds of thousands, cannot be endured, and cannot be used on the folding screen mobile phone.
Patent application CN106863933A discloses a high temperature and friction resistant protective film for mobile phone, which has good high temperature resistance and can effectively protect the mobile phone to prevent collision and scratch, but because the mobile phone film is made of PET substrate, the application of the protective film for mobile phone is greatly limited because the folding resistance of the prepared mobile phone film is not considered.
Therefore, the invention not only realizes the explosion-proof film with visible light color, but also increases the explosion-proof and anti-falling capability of the window part of the mobile phone by coating the special acrylic acid adhesive on the CPI substrate to form a structure with more than 3 layers, has light weight and good folding resistance, and can realize more than 20 ten thousand of bending times.
Disclosure of Invention
In order to solve the problems, the first aspect of the invention provides a foldable display panel explosion-proof film which comprises a surface protection film 1, a surface primer layer 2, a CPI film 3, a transparent optical adhesive layer 4 and a release film 5 from top to bottom in sequence.
Preferably, the thickness of the surface protection film is 20 to 50 μm;
in a preferred embodiment, the thickness of the surface primer layer is 0.1 to 1 μm.
As a preferable mode, the CPI film has a thickness of 1 to 50 μm;
preferably, the thickness of the CPI film is 20-30 μm;
as a preferable scheme, the thickness of the transparent optical adhesive layer is 10-50 μm;
as a preferable scheme, the thickness of the transparent optical adhesive layer is 30-40 μm;
as a preferable scheme, the surface priming coat at least comprises the following raw materials in parts by weight: 100 parts of polyurethane resin and 0.1-5 parts of isocyanate curing agent.
As a preferable embodiment, the polyurethane-based resin is commercially available, for example, SPT-PU of Guangdong New Material science and technology Co., ltd.
In a preferred embodiment, the isocyanate-containing curing agent is one or more of HMDI (hexamethylene diisocyanate), HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate), and TDI (toluene diisocyanate).
In a preferred embodiment, the isocyanate-containing curing agent is a mixture of HMDI and HDI.
As a preferable scheme, the weight ratio of the HMDI to the HDI is 3: (6-8).
As a preferable scheme, the weight ratio of the HMDI to the HDI is 3:7.
as a preferable scheme, the transparent optical adhesive layer at least comprises the following raw materials in parts by weight: 15 to 25 portions of acrylic monomer, 5 to 15 portions of unsaturated monomer, 0.2 to 0.5 portion of curing agent, 0.1 to 0.5 portion of UV absorbent with absorption wavelength less than or equal to 380nm, and 0.2 to 0.5 portion of photoinitiator.
As a preferable scheme, the transparent optical adhesive layer at least comprises the following raw materials in parts by weight: 15 to 25 portions of acrylic monomer, 5 to 15 portions of unsaturated monomer, 0.35 to 0.45 portion of curing agent, 0.18 to 0.3 portion of UV absorbent with absorption wavelength less than or equal to 380nm, and 0.35 to 0.45 portion of photoinitiator.
In a preferred embodiment, the weight ratio of the acrylic monomer to the curing agent is (48-52): 1.
as a preferable scheme, the propionic acid monomer is one or more of methacrylate, vinyl formate, butyl acrylate and ethyl benzoate.
In a preferred embodiment, the propionic acid monomer is one or more of methyl methacrylate and butyl acrylate.
In a preferred embodiment, the propionic acid monomer is a mixture of methyl methacrylate and butyl acrylate.
In a preferred embodiment, the weight ratio of methyl methacrylate to butyl acrylate is (1-3): (5-7).
As a preferred embodiment, the methyl methacrylate is commercially available, for example, from Shanghai chemical industry procurement supplies for quintuplet chemical plants; the butyl acrylate may be commercially available, for example, from Shanghai chemical sources for supply to the quintuplet chemical plant.
In a preferred embodiment, the unsaturated monomer is one or more of acrylic acid, α -methacrylic acid, methyl acrylate and methyl methacrylate.
As a preferable scheme, the unsaturated monomer is one or more of alpha-methacrylic acid and acrylic acid.
In a preferred embodiment, the unsaturated monomer is a mixture of α -methacrylic acid and acrylic acid.
In a preferred embodiment, the weight ratio of the alpha-methacrylic acid to the acrylic acid is (2-5): (6-8).
As a preferable scheme, the weight ratio of the alpha-methacrylic acid to the acrylic acid is 1:2.
in a preferred embodiment, the α -methacrylic acid is commercially available, for example, from Shanghai chemical suppliers such as Pentium chemical factories, and the acrylic acid is commercially available, for example, from Jen-Prolai chemical Co., ltd.
As a preferable scheme, the curing agent is one or more of a polyfunctional isocyanate compound and a polyfunctional epoxy compound.
In a preferred embodiment, the curing agent is a multifunctional epoxy compound.
In a preferred embodiment, the multifunctional epoxy compound is one or more selected from ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, 1, 6-hexanediol diglycidyl ether, bisphenol a epichlorohydrin type epoxy resin, N' -tetraglycidyl-m-xylylenediamine, 1, 3-bis (N, N-diglycidylaminomethyl) cyclohexane, N-diglycidylaniline, and N, N-diglycidyltoluidine.
In a preferred embodiment, the multifunctional epoxy compound is a mixture of polyethylene glycol diglycidyl ether and 1, 6-hexanediol diglycidyl ether.
In a preferred embodiment, the weight ratio of the polyethylene glycol diglycidyl ether to the 1, 6-hexanediol diglycidyl ether is 1: (3-5).
As a preferable scheme, the weight ratio of the polyethylene glycol diglycidyl ether to the 1, 6-hexanediol diglycidyl ether is 1:4.
in a preferable scheme, the UV absorbent with the absorption wavelength less than or equal to 380nm is a benzotriazole UV absorbent, and the benzotriazole UV absorbent is UV-P.
In a preferred embodiment, the photoinitiator is one or more of photoinitiator TPO, photoinitiator 651, photoinitiator 1173 and photoinitiator 184.
In a preferred embodiment, the photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO.
In a preferred embodiment, the weight ratio of the photoinitiator 184 to the photoinitiator TPO is 2:3.
the invention provides a preparation method of a folding display screen explosion-proof membrane, which mainly comprises the following steps:
(1) Adding an isocyanate-containing curing agent into polyurethane resin, and uniformly mixing to obtain an uncured surface base coat;
(2) Uniformly stirring an acrylic monomer, an unsaturated monomer, a UV (ultraviolet) absorbent with the absorption wavelength of less than or equal to 380nm and an initiator, adding a curing agent, and uniformly mixing to obtain an uncured transparent optical adhesive layer;
(3) Coating the uncured surface base coat on the upper surface of the CPI film, coating the uncured transparent optical adhesive layer on the lower surface of the CPI film, and performing ultraviolet curing;
(4) And fixing the surface protection film on the upper surface of the surface priming coat, and fixing the release film on the lower surface of the transparent optical adhesive layer to obtain the folding display screen explosion-proof film.
The third aspect of the invention provides a structure of a folding display screen explosion-proof film, which sequentially comprises a surface protection film, a surface bottom coating, a CPI film, a transparent optical adhesive layer and a release film from top to bottom.
Has the advantages that:
1. the invention is characterized in that the weight ratio of methyl methacrylate to butyl acrylate is limited to (1-3): (5-7), the film forming property and the flexibility of the transparent optical adhesive layer are improved while the strength of the transparent optical adhesive layer is effectively improved.
2. The invention is characterized in that the weight ratio of alpha-methacrylic acid to acrylic acid is limited to (2-5): (6-8), the crosslinking effect of the system is improved, so that the cohesive strength and the bonding strength of the transparent optical adhesive layer are improved.
3. According to the invention, through the synergistic effect of the polyfunctional epoxy compound, the unsaturated monomer and the acrylic acid monomer, the permanent adhesion of the transparent optical adhesive layer is improved, and meanwhile, the heat resistance and the humidity resistance of the system are also improved, and the transparent optical adhesive layer has the characteristics of no yellowing, strong peeling strength and the like.
4. The invention increases the explosion-proof and anti-falling capability of the window part of the mobile phone by coating the special acrylic acid adhesive on the CPI substrate to form a structure with more than 3 layers, has light weight and good folding resistance, and can realize more than 20 ten thousand folding times.
Drawings
Fig. 1 is a schematic structural diagram of the display screen explosion-proof membrane of the invention.
In the figure: 1. a surface protective film; 2. a surface primer layer; 3. a CPI film; 4. a transparent optical adhesive layer; 5. and (5) a release film.
Detailed Description
Examples
Example 1
The first aspect of the embodiment provides a foldable display screen explosion-proof membrane which sequentially comprises a surface protection membrane 1, a surface priming coating 2, a CPI membrane 3, a transparent optical adhesive layer 4 and a release membrane 5 from top to bottom.
The thickness of the surface protection film is 30 mu m;
the thickness of the surface primer layer was 0.5 μm.
The CPI film had a thickness of 25 μm;
the thickness of the transparent optical adhesive layer is 35 μm;
the surface base coat described in this example 1 comprises the following raw materials in parts by weight: 100 parts of polyurethane resin and 3 parts of isocyanate curing agent.
The polyurethane resin was purchased from SPT-PU of Guangdong Dongli New Material science and technology Co., ltd.
The isocyanate-containing curing agent is a mixture of HMDI and HDI; the weight ratio of the HMDI to the HDI is 3:7.
the transparent optical adhesive layer comprises the following raw materials in parts by weight: 20 parts of acrylic monomer, 10 parts of unsaturated monomer, 0.4 part of curing agent, 0.24 part of UV absorbent with absorption wavelength less than or equal to 380nm, and 0.4 part of photoinitiator.
The propionic acid monomer is a mixture of methyl methacrylate and butyl acrylate. The weight ratio of the methyl methacrylate to the butyl acrylate is 2:6. the methyl methacrylate is purchased from Shanghai chemical reagent procurement supply quintuplet chemical plants; the butyl acrylate was purchased from Shanghai chemical procurement and supply quintuplet chemical plants.
The unsaturated monomer is a mixture of alpha-methacrylic acid and acrylic acid. The weight ratio of the alpha-methacrylic acid to the acrylic acid is 1:2. the alpha-methacrylic acid is purchased from a five-link chemical plant purchased and supplied by Shanghai chemical reagents; the acrylic acid was purchased from knam plewa chemical limited.
The curing agent is a multifunctional epoxy compound, and the multifunctional epoxy compound is a mixture of polyethylene glycol diglycidyl ether and 1, 6-hexanediol diglycidyl ether. The weight ratio of the polyethylene glycol diglycidyl ether to the 1, 6-hexanediol diglycidyl ether is 1:4. the polyethylene glycol diglycidyl ether was purchased from jinan quanxin new materials co, and the 1, 6-hexanediol diglycidyl ether was purchased from cornis chemical (north of lake) co.
The UV absorbent with the absorption wavelength less than or equal to 380nm is a benzotriazole UV absorbent, and the benzotriazole UV absorbent is UV-P and is purchased from Jiangsu plela Biotechnology Co., ltd.
The photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO. The weight ratio of the photoinitiator 184 to the photoinitiator TPO is 2:3. the photoinitiator 184, photoinitiator TPO, were both purchased from guangzhou, guangdong electronic materials, inc.
The invention provides a preparation method of a folding display screen explosion-proof membrane, which comprises the following steps:
(1) Adding an isocyanate-containing curing agent into polyurethane resin, and uniformly mixing to obtain an uncured surface base coat;
(2) Uniformly stirring an acrylic monomer, an unsaturated monomer, a UV (ultraviolet) absorbent with the absorption wavelength of less than or equal to 380nm and a photoinitiator, adding a curing agent, and uniformly mixing to obtain an uncured transparent optical adhesive layer;
(3) Coating the uncured surface base coat on the upper surface of the CPI film, coating the uncured transparent optical adhesive layer on the lower surface of the CPI film, and performing ultraviolet curing;
(4) And fixing the surface protection film on the upper surface of the surface bottom coating, and fixing the release film on the lower surface of the transparent optical adhesive layer to obtain the folding display screen explosion-proof film.
Example 2
The first aspect of the embodiment provides a foldable display panel explosion-proof film, which comprises a surface protection film 1, a surface primer layer 2, a cpi film 3, a transparent optical adhesive layer 4 and a release film 5 from top to bottom in sequence.
The thickness of the surface protection film is 25 mu m;
the thickness of the surface primer layer was 0.3 μm.
The CPI film had a thickness of 25 μm;
the thickness of the transparent optical adhesive layer is 35 mu m;
the surface base coat described in this example 1 comprises the following raw materials in parts by weight: 100 parts of polyurethane resin and 3 parts of isocyanate curing agent.
The polyurethane resin was purchased from SPT-PU of Guangdong Dongli New Material science and technology Co.
The isocyanate-containing curing agent is a mixture of HMDI and HDI; the weight ratio of the HMDI to the HDI is 3:8.
the transparent optical adhesive layer comprises the following raw materials in parts by weight: 25 parts of acrylic monomer, 15 parts of unsaturated monomer, 0.4 part of curing agent, 0.3 part of UV absorbent with absorption wavelength less than or equal to 380nm and 0.4 part of photoinitiator.
The propionic acid monomer is a mixture of methyl methacrylate and butyl acrylate. The weight ratio of the methyl methacrylate to the butyl acrylate is 2:6. the methyl methacrylate is purchased from Shanghai chemical reagent procurement supply quintuplet chemical plants; the butyl acrylate was purchased from Shanghai chemical procurement and supply quintuplet chemical plants.
The unsaturated monomer is a mixture of alpha-methacrylic acid and acrylic acid. The weight ratio of the alpha-methacrylic acid to the acrylic acid is 1:2. the alpha-methacrylic acid is purchased from a Penta chemical plant purchased and supplied by Shanghai chemical reagents; the acrylic acid was purchased from knam plewa chemical limited.
The curing agent is a multifunctional epoxy compound, and the multifunctional epoxy compound is a mixture of polyethylene glycol diglycidyl ether and 1, 6-hexanediol diglycidyl ether. The weight ratio of the polyethylene glycol diglycidyl ether to the 1, 6-hexanediol diglycidyl ether is 1:4. the polyethylene glycol diglycidyl ether was purchased from jinan quanxin new materials co, and the 1, 6-hexanediol diglycidyl ether was purchased from cornis chemical (north of lake) co.
The UV absorbent with the absorption wavelength less than or equal to 380nm is a benzotriazole UV absorbent, and the benzotriazole UV absorbent is UV-P and is purchased from Jiangsu plela Biotechnology Co., ltd.
The photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO. The weight ratio of the photoinitiator 184 to the photoinitiator TPO is 2:3. the photoinitiator 184, the photoinitiator TPO, was purchased from guangdong electronics, inc.
The invention provides a preparation method of a folding display screen explosion-proof membrane, which comprises the following steps:
(1) Adding an isocyanate-containing curing agent into polyurethane resin, and uniformly mixing to obtain an uncured surface base coat;
(2) Uniformly stirring an acrylic monomer, an unsaturated monomer, a UV (ultraviolet) absorbent with the absorption wavelength of less than or equal to 380nm and a photoinitiator, adding a curing agent, and uniformly mixing to obtain an uncured transparent optical adhesive layer;
(3) Coating the uncured surface base coat on the upper surface of the CPI film, coating the uncured transparent optical adhesive layer on the lower surface of the CPI film, and performing ultraviolet curing;
(4) And fixing the surface protection film on the upper surface of the surface priming coat, and fixing the release film on the lower surface of the transparent optical adhesive layer to obtain the folding display screen explosion-proof film.
Example 3
The first aspect of the embodiment provides a foldable display panel explosion-proof film, which comprises a surface protection film 1, a surface primer layer 2, a cpi film 3, a transparent optical adhesive layer 4 and a release film 5 from top to bottom in sequence.
The thickness of the surface protection film is 30 mu m;
the thickness of the surface primer layer was 1 μm.
The thickness of the CPI film is 50 μm;
the thickness of the transparent optical adhesive layer is 50 micrometers;
the surface base coat described in this example 1 comprises the following raw materials in parts by weight: 100 parts of polyurethane resin and 3 parts of isocyanate curing agent.
The polyurethane resin was purchased from SPT-PU of Guangdong Dongli New Material science and technology Co.
The isocyanate-containing curing agent is a mixture of HMDI and HDI; the weight ratio of the HMDI to the HDI is 3:8.
the transparent optical adhesive layer comprises the following raw materials in parts by weight: 25 parts of acrylic monomer, 15 parts of unsaturated monomer, 0.4 part of curing agent, 0.3 part of UV absorbent with absorption wavelength less than or equal to 380nm and 0.4 part of photoinitiator.
The propionic acid monomer is a mixture of methyl methacrylate and butyl acrylate. The weight ratio of the methyl methacrylate to the butyl acrylate is 2:6. the methyl methacrylate is purchased from a Penta chemical plant purchased and supplied by Shanghai chemical reagent; the butyl acrylate was purchased from Shanghai chemical procurement and supply quintuplet chemical plants.
The unsaturated monomer is a mixture of alpha-methacrylic acid and acrylic acid. The weight ratio of the alpha-methacrylic acid to the acrylic acid is 1:2. the alpha-methacrylic acid is purchased from a five-link chemical plant purchased and supplied by Shanghai chemical reagents; the acrylic acid was purchased from knam plewa chemical limited.
The curing agent is a multifunctional epoxy compound, and the multifunctional epoxy compound is a mixture of polyethylene glycol diglycidyl ether and 1, 6-hexanediol diglycidyl ether. The weight ratio of the polyethylene glycol diglycidyl ether to the 1, 6-hexanediol diglycidyl ether is 1:4. the polyethylene glycol diglycidyl ether was purchased from jinan quanxing new materials ltd, and the 1, 6-hexanediol diglycidyl ether was purchased from cornis chemical (hubei) ltd.
The UV absorbent with the absorption wavelength less than or equal to 380nm is a benzotriazole UV absorbent, and the benzotriazole UV absorbent is UV-P and is purchased from Jiangsu plela Biotechnology Co., ltd.
The photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO. The weight ratio of the photoinitiator 184 to the photoinitiator TPO is 2:3. the photoinitiator 184, the photoinitiator TPO, was purchased from guangdong electronics, inc.
The invention provides a preparation method of a folding display screen explosion-proof membrane, which comprises the following steps:
(1) Adding an isocyanate-containing curing agent into polyurethane resin, and uniformly mixing to obtain an uncured surface base coat;
(2) Uniformly stirring an acrylic monomer, an unsaturated monomer, a UV (ultraviolet) absorbent with the absorption wavelength of less than or equal to 380nm and a photoinitiator, adding a curing agent, and uniformly mixing to obtain an uncured transparent optical adhesive layer;
(3) Coating the uncured surface base coat on the upper surface of the CPI film, coating the uncured transparent optical adhesive layer on the lower surface of the CPI film, and performing ultraviolet curing;
(4) And fixing the surface protection film on the upper surface of the surface bottom coating, and fixing the release film on the lower surface of the transparent optical adhesive layer to obtain the folding display screen explosion-proof film.
Comparative example 1
The embodiment of comparative example 1 is the same as example 1; the difference is that the foldable display screen explosion-proof membrane described in comparative example 1 sequentially comprises a surface protection membrane, a surface primer layer, a PET membrane, a transparent optical adhesive layer and a release membrane from top to bottom.
And (3) performance testing:
(1) Folding times are as follows: the number of folding endurance tests by an MIT tester according to JIS P8115 (2001) is shown in Table 1.
(2) Peel strength of transparent optical adhesive layer: the test is carried out according to GB/T2792-2014, and the table 2 shows.
And (3) performance test results:
table 1 shows the results of the performance test of the folding endurance of the rupture films for display panels prepared in examples 1 to 3 and comparative example 1.
TABLE 1
Figure BDA0003512001570000131
Figure BDA0003512001570000141
Table 2 shows the results of the performance test of the peel strength of the transparent optical adhesive layers prepared in examples 1 to 3 and comparative example 1.
TABLE 2
Peel strength (N/25 mm)
Example 1 20
Example 2 18
Example 3 18
Comparative example 1 14

Claims (10)

1. The foldable display screen explosion-proof film is characterized by sequentially comprising a surface protection film, a surface bottom coating layer, a CPI film, a transparent optical adhesive layer and a release film from top to bottom.
2. The display screen explosion-proof membrane as recited in claim 1, wherein the surface primer layer comprises at least the following raw materials in parts by weight: 100 parts of polyurethane resin and 0.1-5 parts of isocyanate curing agent.
3. The display panel rupture membrane of claim 2, wherein the isocyanate-containing curing agent is one or more of HMDI, HDI, IPDI, TDI.
4. The display screen explosion-proof membrane of claim 1, wherein the transparent optical adhesive layer comprises at least the following raw materials in parts by weight: 15 to 25 portions of acrylic monomer, 5 to 15 portions of unsaturated monomer, 0.2 to 0.5 portion of curing agent, 0.1 to 0.5 portion of UV absorbent with the absorption wavelength less than or equal to 380nm, and 0.2 to 0.5 portion of photoinitiator.
5. The display screen explosion-proof membrane of claim 1, wherein the transparent optical adhesive layer comprises at least the following raw materials in parts by weight: 15 to 25 portions of acrylic monomer, 5 to 15 portions of unsaturated monomer, 0.35 to 0.45 portion of curing agent, 0.18 to 0.3 portion of UV absorbent with absorption wavelength less than or equal to 380nm, and 0.35 to 0.45 portion of photoinitiator.
6. A display screen explosion-proof membrane according to any one of claims 4 to 5, wherein the propionic acid monomer is one or more of methacrylate, vinyl formate, butyl acrylate and ethylbenzoic acid.
7. The display panel rupture membrane of any of claims 4 to 5, wherein the unsaturated monomer is one or more of acrylic acid, alpha-methacrylic acid, methyl acrylate and methyl methacrylate.
8. The display panel rupture disk of any of claims 4 to 5, wherein the curing agent is one or more of a polyfunctional isocyanate compound and a polyfunctional epoxy compound.
9. The display screen explosion-proof membrane as recited in any one of claims 4 to 5, wherein the UV absorber with the absorption wavelength of 380nm or less is a benzotriazole UV absorber.
10. Use of a display screen rupture disk according to any one of claims 1 to 9 in a foldable mobile phone case, a display screen.
CN202210154806.0A 2022-02-21 2022-02-21 Folding display screen explosion-proof membrane and application thereof Pending CN115491139A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105511139A (en) * 2015-12-23 2016-04-20 东莞市纳利光学材料有限公司 Liquid crystal display screen with ultrathin OCA optical film and preparing method of liquid crystal display screen
CN111028683A (en) * 2019-11-29 2020-04-17 湖南中天碧水膜科技有限公司 Flexible cover plate
CN111171742A (en) * 2020-02-26 2020-05-19 江苏斯迪克新材料科技股份有限公司 Bendable protective film for folding screen and preparation method thereof
CN113025227A (en) * 2021-03-31 2021-06-25 浙江日久新材料科技有限公司 Novel printable inner anti-explosion membrane of mobile phone rear cover and preparation method thereof
CN113270025A (en) * 2020-02-14 2021-08-17 华为技术有限公司 Flexible screen cover plate, flexible display panel, flexible screen and foldable electronic equipment
CN113966373A (en) * 2019-11-15 2022-01-21 株式会社Lg化学 Protective film with variable adhesive force for foldable display and foldable display device including the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105511139A (en) * 2015-12-23 2016-04-20 东莞市纳利光学材料有限公司 Liquid crystal display screen with ultrathin OCA optical film and preparing method of liquid crystal display screen
CN113966373A (en) * 2019-11-15 2022-01-21 株式会社Lg化学 Protective film with variable adhesive force for foldable display and foldable display device including the same
CN111028683A (en) * 2019-11-29 2020-04-17 湖南中天碧水膜科技有限公司 Flexible cover plate
CN113270025A (en) * 2020-02-14 2021-08-17 华为技术有限公司 Flexible screen cover plate, flexible display panel, flexible screen and foldable electronic equipment
CN111171742A (en) * 2020-02-26 2020-05-19 江苏斯迪克新材料科技股份有限公司 Bendable protective film for folding screen and preparation method thereof
CN113025227A (en) * 2021-03-31 2021-06-25 浙江日久新材料科技有限公司 Novel printable inner anti-explosion membrane of mobile phone rear cover and preparation method thereof

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