CN115537164A - Full-lamination liquid optical cement for capacitive touch screen and application - Google Patents

Full-lamination liquid optical cement for capacitive touch screen and application Download PDF

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Publication number
CN115537164A
CN115537164A CN202211219272.1A CN202211219272A CN115537164A CN 115537164 A CN115537164 A CN 115537164A CN 202211219272 A CN202211219272 A CN 202211219272A CN 115537164 A CN115537164 A CN 115537164A
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touch screen
liquid optical
optical cement
parts
capacitive touch
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CN115537164B (en
Inventor
吴文琦
牛森
先真
孙中昊
鲁琰涵
秦海婧
李博瑶
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Zhenping Power Supply Co Of State Grid Henan Electric Power Co
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Zhenping Power Supply Co Of State Grid Henan Electric Power 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
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • C09J163/10—Epoxy resins modified by unsaturated compounds
    • 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
    • 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
    • C09J11/08—Macromolecular additives
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention discloses a full-lamination liquid optical cement for a capacitive touch screen and application thereof, belonging to the technical field of optical cement and comprising the following components: prepolymer: epoxy acrylates, urethane acrylates; photoinitiator (2): 1-hydroxy-cyclohexylbenzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, cumylcyclopentadienylferrihexafluorophosphate; active diluent: isobornyl methacrylate, ditrimethylolpropane tetraacrylate. The liquid optical adhesive has excellent light transmittance, definition, adhesion and excellent humidity resistance and weather resistance, greatly improves the overall safety, reliability, durability and attractiveness of the touch screen, and effectively maintains the use stability and long-term performance of the touch screen.

Description

Full-lamination liquid optical cement for capacitive touch screen and application
Technical Field
The invention relates to the technical field of capacitive touch screens, in particular to a fully-laminated liquid optical cement for a capacitive touch screen and application thereof.
Background
The capacitive touch screen technology works by utilizing current induction of a human body, generally, the capacitive touch screen technology can be roughly divided into 3 parts from the structural point of view, and the protective glass, the touch screen and the LCD display screen are respectively arranged from top to bottom. The three parts need to be aligned and attached, generally, two times of attachment are needed, one time of attachment is performed between the protective glass and the touch screen, and the other time of attachment is performed between the display screen and the touch screen. The display screen can be divided into a full-lamination mode and a frame-lamination mode according to the lamination mode, wherein the frame-lamination mode is often adopted between the display screen and the touch screen, the frame-lamination process is simple, the cost is low, and the display effect is greatly reduced after light is reflected due to the fact that an air layer exists between the display screen and the touch screen. The full-lamination is to completely stick the display screen and the touch screen together in a seamless mode. Due to the elimination of the air layer, a better display effect can be provided compared to a frame sticker. The full-lamination common use is liquid optical glue, has good bonding strength, can be rapidly cured by ultraviolet rays, can also be cured under the conditions of normal temperature and medium temperature, and has the characteristics of small curing shrinkage rate, yellowing resistance and the like.
The liquid optical adhesive may be classified into an acrylate optical adhesive, a polyurethane optical adhesive, an epoxy optical adhesive, a silicone optical adhesive, and the like according to the type of the main resin. Optical adhesives of different main body resins have different performance characteristics, for example, polyurethane type optical adhesives have wide adhesive surfaces but obviously insufficient moisture resistance, epoxy type optical adhesives have high adhesive strength but large linear shrinkage and are easy to cause disconnection of a conductive wire, and silicone resins have extremely excellent temperature resistance but hardly have too much resistance to corrosion of solvents. The acrylic is between each system, has higher optical performance and is particularly suitable for bonding optical devices. Therefore, a liquid optical adhesive suitable for full lamination of a touch screen and having excellent comprehensive performance needs to be developed.
Patent document CN111808534A discloses an ultraviolet curing liquid optical adhesive and a preparation method and application thereof. The intrinsic solid shrinkage of the ultraviolet curing liquid optical cement is below 0.6%. The ultraviolet curing liquid optical cement comprises tackifying resin, reactive oligomer, reactive diluent and photoinitiator. The ultraviolet curing liquid optical cement can reduce curing shrinkage and yellow spots in the liquid crystal touch screen attaching process. However, the liquid optical cement is cured in two steps, which is complicated and needs to be improved in comprehensive effect.
The patent document with publication number CN113214743A discloses an optical adhesive for attaching a touch display screen and a preparation method thereof, the optical adhesive is composed of a three-layer thermal composite structure and comprises EVA optical adhesive of a middle layer and a first layer OCA adhesive and a second layer OCA adhesive which are compounded on two sides of the EVA optical adhesive, a first layer PET release film is coated outside the first layer OCA adhesive, and a second layer PET release film is coated outside the second layer OCA adhesive. The raw materials of the optical adhesive are simple and easy to obtain, the preparation method is easy to operate, the compactness of the joint is improved through graft modification, and the curing shrinkage rate and the yellowing resistance of the optical adhesive need to be improved.
Disclosure of Invention
In view of the above, the present invention provides a fully-laminated liquid optical adhesive for a capacitive touch screen and an application thereof, so as to solve the problems mentioned above.
In order to achieve the purpose, the invention adopts the technical scheme that:
the full-lamination liquid optical cement for the capacitive touch screen comprises the following components:
prepolymer: epoxy acrylates, urethane acrylates;
photoinitiator (2): 1-hydroxy-cyclohexylbenzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, cumylcyclopentadienylferrihexafluorophosphate;
active diluent: isobornyl methacrylate, ditrimethylolpropane tetraacrylate.
Further, the weight parts of the components are as follows:
prepolymer: 35-45 parts of epoxy acrylate and 10-15 parts of polyurethane acrylate;
photoinitiator (2): 1.2-2 parts of 1-hydroxy-cyclohexyl benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 0.2-0.5 part, and isopropylphenyl cyclopentadienyl iron hexafluorophosphate 0.1-0.3 part;
active diluent: 15-20 parts of isobornyl methacrylate and 8-12 parts of ditrimethylolpropane tetraacrylate.
Further, the additive also comprises the following additives in parts by weight: 0.2-0.8 part of p-toluenesulfonic acid, 1.3-2 parts of coupling agent, 5-8 parts of plasticizer, 0.5-1.2 parts of antioxidant and 0.1-0.4 part of polymerization inhibitor.
Further, the coupling agent is a silane coupling agent KH560 or KH570.
Further, the plasticizer is one or more of tri (2-ethylhexyl) phosphate, dioctyl sebacate and poly adipic acid-1,2-propylene glycol ester.
Further, the plasticizer comprises the following components in percentage by weight: 25-39% of tri (2-ethylhexyl) phosphate, 56-70% of dioctyl sebacate and 1-6% of poly (adipic acid-1,2-propylene glycol ester).
Further, the antioxidant is 1010 or 1076.
Further, the polymerization inhibitor is benzenediol and/or p-methoxyphenol.
Further, in the polymerization inhibitor, the percentage content of each component is as follows: 40-50% of benzenediol and 50-60% of p-methoxyphenol.
Furthermore, the full-lamination liquid optical cement is applied to the lamination of the touch screen panel.
The ultraviolet curing technology means that under the radiation of ultraviolet light, active groups of substances containing photoactive groups are decomposed to promote the cracking of unsaturated bonds and the like in reactants, and a series of polymerization reactions are carried out, so that a reticular macromolecular structure is formed by crosslinking. The ultraviolet curing is the most important one in the radiation curing technology, and has the characteristics of high efficiency, wide adaptability, economy and environmental protection. The liquid optical adhesive is also widely applied by adopting an ultraviolet curing technology, and generally comprises main components such as a prepolymer, a photoinitiator, a reactive diluent and the like, wherein under the irradiation of ultraviolet light with proper wavelength and light intensity, the photoinitiator rapidly generates free radicals or cations so as to induce the prepolymer and the reactive diluent to be polymerized and crosslinked into a net structure, so that the prepolymer and the reactive diluent are bonded with a bonded material.
The two most common types of photoinitiators are the free radical system and the cationic system, and the free radical photoinitiators can be divided into two types: cracking type and hydrogen abstraction type. The cracking type is a common type, and after the photoinitiator absorbs light radiation, the photoinitiator reaches energy for transition from a ground state to an excited state, so that the photoinitiator is decomposed into countless active fragments, and the active fragments initiate a monomer containing active groups to perform polymerization reaction, cross-linking and curing, so that the whole substance is catalyzed and polymerized. The cationic photoinitiator is activated by light to enable molecules to be in an excited state, active fragments are not generated after the molecules are decomposed, and protonic acid or Lewis acid is generated, so that the cationic monomers are initiated to be polymerized in a crosslinking mode. That is, the cationic photoinitiator needs two steps to initiate polymerization, so the curing speed of the cationic photoinitiator is low, and a common technician usually uses a free radical photoinitiator during testing, and the free radical photoinitiator is mature, so the cationic photoinitiator is not generally used in the full-lamination liquid optical adhesive in order to improve the curing speed. In the process of research, the inventor of the present application finds that even if two free radical photoinitiators are used, the problems of large volume shrinkage, poor deep curing and the like still exist, while the cationic photoinitiator can compensate the defects, but belongs to different curing modes, and the curing rates of the two modes are different, and even if the two modes are used in combination, the curing effect is still not ideal, so that the combination of the two curing modes is not easy to think by the person skilled in the art.
The invention has the following beneficial effects:
the invention adopts epoxy acrylate and polyurethane acrylate as prepolymer, the epoxy acrylate has epoxy active group and acrylic group with optical active group, which makes the epoxy acrylate have water-proof, heat-proof and good adhesive property of epoxy resin, the epoxy acrylate has benzene ring structure in molecule, when used as prepolymer, the obtained product has good heat-proof and corrosion-proof property, and the side chain groups are more, the adhesive property is stronger. However, the groups in the chain also result in a prepolymer which is less flexible and susceptible to degradation and fragmentation. The polyurethane acrylate is different from epoxy acrylate in that the polyurethane acrylate does not directly react with acrylic acid in the synthesis process, isocyanate groups in the polyurethane react with hydroxyl groups in hydroxyl acrylate to generate urethane groups, polyurethane acrylate prepolymers with different properties are obtained by selecting and proportioning different raw materials, the polyurethane has good tensile property and toughness, the tensile strength, the volume shrinkage rate and the adhesive force of a system are improved, and the advantages of the polyurethane acrylate prepolymers are combined after the introduction of the acrylate, so that the excellent comprehensive effect is achieved.
The photoinitiator adopts a mode of combining a free radical photoinitiator and a cationic initiator, and the free radical photoinitiator 1-hydroxy-cyclohexyl benzophenone and 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide are both in cracking type, generate more free radicals and increase the curing rate. The 1-hydroxy-cyclohexyl benzophenone is a high-efficiency and non-yellowing free radical type solid photoinitiator, has good non-yellowing property, and has very small yellowing degree due to no benzyl generated by photolysis even if being exposed to sunlight for a long time after being cured. 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is a high-efficiency free radical photoinitiator, has a relatively long absorption peak, can generate two free radicals of benzoyl and phosphoryl after illumination, and can initiate polymerization, so that the photocuring speed is high, the photobleaching function is realized, the volatilization is low, the absorption range is wide, the yellowing is avoided, the post-polymerization effect is low, and no residue is generated. The cumyl cyclopentadienyl iron hexafluorophosphate is a cationic photoinitiator, and is absorbed by light to be decomposed to generate cumyl and cyclopentadienyl lewis acid to initiate cationic polymerization, so that the cationic polymerization is not influenced by oxygen inhibition, the volume shrinkage rate is small, and the bonding strength is high. The cyclohexanone peroxide is added to oxidize the isopropylphenyl cyclopentadienyl iron hexafluorophosphate, so that the activity is excited, the curing rate is improved, and the obtained optical cement is combined with two free radical photoinitiators to achieve high curing speed, small shrinkage and excellent optical performance.
The active diluent isobornyl methacrylate is monofunctional, the di-condensed trimethylolpropane tetraacrylate is polyfunctional, and the two are combined, so that the conversion rate is increased, the curing speed is increased, the toughness is improved, and the shrinkage rate is controlled. In the additive, the p-toluenesulfonic acid is combined with the photoinitiator, so that the reaction speed is accelerated, and the curing efficiency is improved. The silane coupling agent KH560 or KH570 increases intermolecular force, and improves adhesive strength. The plasticizer phosphoric acid tri (2-ethylhexyl) ester has excellent low temperature resistance and weather resistance, dioctyl sebacate has good low temperature resistance and low volatility, and the poly adipic acid-1,2-propylene glycol ester is prepared by polycondensation of dibasic acid and dihydric alcohol and end capping of monohydric alcohol, and has good heat resistance and durability. The antioxidants 1010 and 1076 improve the oxidation resistance and yellowing resistance. Polymerization inhibitor benzenediol and p-methoxyphenol, which can stop or delay the substances polymerized in the process of storing or carrying the liquid optical cement, and improve the storage stability.
The liquid optical adhesive has excellent light transmittance, definition, adhesion and excellent humidity resistance and weather resistance, greatly improves the overall safety, reliability, durability and attractiveness of the touch screen, and effectively maintains the use stability and long-term performance of the touch screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The full-lamination liquid optical cement for the capacitive touch screen comprises the following components:
prepolymer: 35-45 parts of epoxy acrylate and 10-15 parts of polyurethane acrylate;
photoinitiator (2): 1.2-2 parts of 1-hydroxy-cyclohexyl benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 0.2-0.5 part, and isopropylphenyl cyclopentadienyl iron hexafluorophosphate 0.1-0.3 part;
active diluent: 15-20 parts of isobornyl methacrylate and 8-12 parts of ditrimethylolpropane tetraacrylate.
Preferably, the additive also comprises the following additives in parts by weight: 0.2-0.8 part of p-toluenesulfonic acid, 1.3-2 parts of coupling agent, 5-8 parts of plasticizer, 0.5-1.2 parts of antioxidant and 0.1-0.4 part of polymerization inhibitor.
The coupling agent is a silane coupling agent KH560 or KH570.
The plasticizer is one or more of tri (2-ethylhexyl) phosphate, dioctyl sebacate and poly (adipic acid-1,2-propylene glycol ester).
The plasticizer comprises the following components in percentage by weight: 25-39% of tri (2-ethylhexyl) phosphate, 56-70% of dioctyl sebacate and 1-6% of poly (adipic acid-1,2-propylene glycol ester).
The antioxidant is 1010 or 1076.
The polymerization inhibitor is benzenediol and/or p-methoxyphenol.
In the polymerization inhibitor, the percentage content of each component is as follows: 40-50% of benzenediol and 50-60% of p-methoxyphenol.
The capacitive touch screen is applied to the touch screen panel by fully attaching liquid optical cement.
The marking prepolymer is a component a, the photoinitiator is a component b, and the activator is a component c, wherein the marking prepolymer is a: epoxy acrylate a1, urethane acrylate a2;
a photoinitiator b: 1-hydroxy-cyclohexylbenzophenone b1, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide b2, cumylcyclopentadienyliron hexafluorophosphate b3;
reactive diluent c: isobornyl methacrylate c1 and ditrimethylolpropane tetraacrylate c2.
The additive is a component d, the p-toluenesulfonic acid is a component d1, the coupling agent is a component d2, the plasticizer is a component d3, the antioxidant is a component d4, and the polymerization inhibitor is a component d5;
coupling agent d2: KH560 d21 or KH570 d22;
and (3) a plasticizer d3: tri (2-ethylhexyl) phosphate d31, dioctyl sebacate d32, poly (adipic acid) -1,2-propanediol ester d33.
An antioxidant d4: 1010 d41, 1076 d42.
Polymerization inhibitor d5: benzenediol d51 and p-methoxyphenol d52.
The parts by weight of the components in examples 1-6 are shown in Table 1, and the parts by weight of the components in examples 7-18 are shown in Table 2.
Examples 1 to 6
TABLE 1
Examples a:a1/a2 b:b1/b2/b3 c:c1/c2
1 45:35/10 1.5:1.2/0.2/0.1 23:15/8
2 48:37/11 1.8:1.4/0.3/0.1 25：16/9
3 51:39/12 2:1.5/0.3/0.2 26：17/9
4 54:41/13 2.2:1.6/0.4/0.2 28：18/10
5 57:43/14 2.5:1.8/0.4/0.3 30：19/11
6 60:45/15 2.8:2/0.5/0.3 32：20/12
In embodiments 1 to 6, a method for preparing a fully-laminated liquid optical adhesive for a capacitive touch screen includes the following steps:
1. weighing the prepolymer, the photoinitiator and the reactive diluent according to the proportion;
2. adding the prepolymer and the reactive diluent into a reaction kettle, stirring for 1h at 40 +/-2 ℃ at 200r/min, adding the photoinitiator, and stirring for 2h at 300 r/min;
3. defoaming by a vacuum pump, standing for 1h at normal temperature, and filtering.
Examples 7 to 18
TABLE 2
Examples d1 d2:d21/d22 d3:d31/d32/d33 d4:d41/d42 d5:d51/d52
7 0.2 1.3:0/1.3 5:0/5/0 0.5:0.5/0 0.1:0.1/0
8 0.3 1.4:1.4/0 5: 1.25/3.5/0.25 0.6:0/0.6 0.1:0.045/0.055
9 0.4 1.5:0/1.5 5:1.75/3.1/0.15 0.7:0.7/0 0.1:0.05/0.05
10 0.4 1.5:1.5/0 6:1.8/4.14/0.06 0.7:0/0.7 0.2:0.08/0.12
11 0.5 1.6:0/1.6 6:2.1/3.72/0.18 0.8:0.8/0 0.2:0.09/0.11
12 0.6 1.6:1.6/0 6:2.28/3.36/0.36 0.8:0/0.8 0.2:0.1/0.1
13 0.5 1.7:0/1.7 7:2.1/4.83/0.07 0.9:0.9/0 0.3:0.12/0.18
14 0.6 1.7:1.7/0 7:2.45/4.34/0.21 0.9:0/0.9 0.3:0.135/0.165
15 0.7 1.8:0/1.8 7:2.66/3.92/0.42 1.0:1.0/0 0.3:0.15/0.15
16 0.6 1.8:1.8/0 8:2.8/4.96/0.24 1.0:0/1.0 0.4:0.16/0.24
17 0.7 1.9:0/1.9 8:3.04/4.48/0.48 1.1:1.1/0 0.4:0.18/0.22
18 0.8 2.0:2.0/0 8:3.12/4.56/0.32 1.2:0/1.2 0.4:0.2/0.2
In examples 7 to 18, the compounding ratios of the prepolymer, the photoinitiator and the reactive diluent were as in examples 1 to 6, wherein in examples 7 and 8, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 1, in examples 9 and 10, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 2, in examples 11 and 12, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 3, in examples 13 and 14, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 4, in examples 15 and 16, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 5, and in examples 17 and 18, the parts by weight of the prepolymer, the photoinitiator and the reactive diluent were the same as in example 6.
Example 19
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as the embodiment 9, but is different from the embodiment 9 in that 1.8 parts by weight of a photoinitiator is used in the embodiment, wherein 1.3 parts by weight of 1-hydroxy-cyclohexyl benzophenone, 0.3 part by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.15 part by weight of cumyl cyclopentadienyl iron hexafluorophosphate and 0.05 part by weight of cyclohexanone peroxide are used.
Example 20
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as the embodiment 11, but is different from the embodiment 11 in that 2 parts by weight of a photoinitiator are used in the embodiment, wherein 1.4 parts of 1-hydroxy-cyclohexyl benzophenone, 0.3 part of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.2 part of cumyl cyclopentadienyl iron hexafluorophosphate and 0.1 part of cyclohexanone peroxide are used.
Example 21
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as the embodiment 13, but is different from the embodiment 13 in that 2.2 parts by weight of a photoinitiator is used in the embodiment, wherein 1.5 parts by weight of 1-hydroxy-cyclohexyl benzophenone, 0.4 part by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.22 part by weight of cumyl cyclopentadienyl iron hexafluorophosphate and 0.08 part by weight of cyclohexanone peroxide are used.
In embodiments 7 to 21, a method for preparing a fully-laminated liquid optical adhesive for a capacitive touch screen includes the following steps:
1. weighing the prepolymer, the photoinitiator, the reactive diluent and the additive according to the proportion;
2. adding the prepolymer and the reactive diluent into a reaction kettle, stirring for 1h at 40 +/-2 ℃ at 200r/min, adding the additive and the photoinitiator, and stirring for 2h at 300 r/min;
3. defoaming by a vacuum pump, standing for 1h at normal temperature, and filtering.
Comparative example 1
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as the embodiment 1, but is different from the embodiment 1 in that 1.4 parts by weight of a photoinitiator is used, wherein 1.2 parts by weight of 1-hydroxy-cyclohexyl benzophenone and 0.2 part by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are used.
Comparative example 2
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as the embodiment 7, but is different from the embodiment 7 in that 1.4 parts by weight of a photoinitiator is used, wherein 1.2 parts by weight of 1-hydroxy-cyclohexyl benzophenone and 0.2 part by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are used.
Comparative example 3
The embodiment provides a full-lamination liquid optical adhesive for a capacitive touch screen, which is the same as that in embodiment 1, but is different from that in embodiment 1 in 3 parts by weight of a photoinitiator, wherein the photoinitiator comprises 2 parts of 1-hydroxy-cyclohexyl benzophenone, 0.6 part of 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide and 0.4 part of cumyl cyclopentadienyl iron hexafluorophosphate.
Comparative example 4
This example provides a liquid optical adhesive for capacitive touch panel, which is the same as example 7, but different from example 7 in that p-toluenesulfonic acid is not included in this comparative example.
The capacitive touch screen full-lamination liquid optical cement is applied to the lamination of a touch screen panel, the liquid optical cement is coated on the touch screen, then protective glass or a display screen is laminated, ultraviolet radiation is used, and finally, the capacitive touch screen full-lamination liquid optical cement is kept stand for 5-6 hours at room temperature.
And (3) performance testing:
the bonding strength is tested according to GB/T31541-2015; the total volume shrinkage rate is measured according to GB/T24148-2014, the light transmittance is measured by a light transmittance instrument DR81, the yellowing index is measured according to GB/T7921-2008, and the measurement result is shown in Table 3.
TABLE 3
Adhesive strength MPa Total volume shrinkage% Yellowing index
Example 1 0.58 0.33 0.52
Example 2 0.58 0.35 0.53
Example 3 0.57 0.33 0.52
Example 4 0.58 0.34 0.55
Example 5 0.59 0.33 0.54
Example 6 0.57 0.33 0.53
Example 7 0.65 0.30 0.41
Example 8 0.67 0.29 0.41
Example 9 0.66 0.28 0.42
Example 10 0.68 0.27 0.41
Example 11 0.67 0.27 0.43
Example 12 0.68 0.29 0.41
Example 13 0.66 0.28 0.42
Example 14 0.67 0.28 0.43
Example 15 0.66 0.27 0.41
Example 16 0.68 0.28 0.42
Example 17 0.68 0.27 0.43
Example 18 0.67 0.27 0.42
Example 19 0.71 0.24 0.41
Example 20 0.71 0.25 0.40
Example 21 0.70 0.25 0.40
Comparative example 1 0.55 0.48 0.52
Comparative example 2 0.61 0.45 0.42
Comparative example 3 0.45 0.36 0.55
Comparative example 4 0.59 0.32 0.41
The liquid optical cement of the examples 1-21 and the comparative examples 1-4 are tested, the light transmittance is more than or equal to 99.0 percent, the curing is carried out under the ultraviolet radiation, the curing time of the examples 1-21 is between 24 and 30s, wherein, the curing time of the examples 1-6 is between 29 and 30s, the curing time of the examples 7-18 is between 26 and 28 s, the curing time of the examples 19-21 is 25s, 24 s and 25s, the curing time of the comparative examples 1-4 is 27 s, 25s, 26 s and 29 s. As can be seen by combining the table 3, the bonding strength of the invention is 0.57-0.71Mpa, the total volume shrinkage rate is 0.35-0.24%, the yellowing index is 0.52-0.40, and the comprehensive performance is excellent. Comparative examples 1 and 2 lack cumyl cyclopentadienyl iron hexafluorophosphate, the volume shrinkage is large, the bonding strength is slightly reduced, comparative example 3 increases the content of the photoinitiator, the bonding strength and the yellowing resistance are reduced, the photoinitiator is excessive and remains in the adhesive layer, so that the adhesive layer is easy to yellow, the surface polymerization rate of the adhesive layer is inconsistent with the internal polymerization rate of the adhesive layer, the internal stress of the adhesive layer is uneven, and the bonding strength is influenced; comparative example 4 lacks p-toluenesulfonic acid, the bonding strength is slightly reduced, the curing time is increased, and the performance of the liquid optical cement is affected.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims (10)

1. The utility model provides a capacitive touch screen liquid optical cement of laminating entirely which characterized in that: comprises the following components:
prepolymer (c): epoxy acrylates, urethane acrylates;
photoinitiator (2): 1-hydroxy-cyclohexylbenzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, cumylcyclopentadienylferrihexafluorophosphate;
active diluent: isobornyl methacrylate, ditrimethylolpropane tetraacrylate.
2. The fully-laminated liquid optical cement for the capacitive touch screen according to claim 1, wherein the fully-laminated liquid optical cement comprises the following components in percentage by weight: the weight parts of the components are as follows:
prepolymer: 35-45 parts of epoxy acrylate and 10-15 parts of polyurethane acrylate;
photoinitiator (2): 1.2-2 parts of 1-hydroxy-cyclohexyl benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 0.2-0.5 part, and isopropylphenyl cyclopentadienyl iron hexafluorophosphate 0.1-0.3 part;
active diluent: 15-20 parts of isobornyl methacrylate and 8-12 parts of ditrimethylolpropane tetraacrylate.
3. The capacitive touch screen full-lamination liquid optical cement according to claim 2, wherein: the additive also comprises the following additives in parts by weight: 0.2-0.8 part of p-toluenesulfonic acid, 1.3-2 parts of coupling agent, 5-8 parts of plasticizer, 0.5-1.2 parts of antioxidant and 0.1-0.4 part of polymerization inhibitor.
4. The fully-laminated liquid optical cement for the capacitive touch screen according to claim 3, wherein the fully-laminated liquid optical cement comprises: the coupling agent is a silane coupling agent KH560 or KH570.
5. The capacitive touch screen full-lamination liquid optical cement according to claim 4, wherein: the plasticizer is one or more of tri (2-ethylhexyl) phosphate, dioctyl sebacate and poly adipic acid-1,2-propylene glycol ester.
6. The capacitive touch screen full-lamination liquid optical cement according to claim 5, wherein: the plasticizer comprises the following components in percentage by weight: 25-39% of tris (2-ethylhexyl) phosphate, 56-70% of dioctyl sebacate and 1-6% of poly (adipic acid) -1,2-propylene glycol ester.
7. The capacitive touch screen full-lamination liquid optical cement according to claim 6, wherein: the antioxidant is 1010 or 1076.
8. The capacitive touch screen full-lamination liquid optical cement according to claim 7, wherein: the polymerization inhibitor is benzenediol and/or p-methoxyphenol.
9. The capacitive touch screen full-lamination liquid optical cement according to claim 8, wherein: in the polymerization inhibitor, the percentage content of each component is as follows: 40-50% of benzenediol and 50-60% of p-methoxyphenol.
10. Use of a full-contact liquid optical cement according to any one of claims 1-9 for touch screen panel contact.
CN202211219272.1A 2022-10-08 2022-10-08 Capacitive touch screen full-lamination liquid optical cement and application thereof Active CN115537164B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140343186A1 (en) * 2011-12-19 2014-11-20 darbond technology co., ltd Ultraviolet cured optic binder
CN104449419A (en) * 2014-12-05 2015-03-25 烟台泰盛精化科技有限公司 Ultraviolet-heat dual curing optical adhesive containing epoxidized polybutadiene resin
CN106244030A (en) * 2016-07-28 2016-12-21 江苏乘鹰新材料股份有限公司 Photocurable adhesive compositions for cold transfer and preparation method thereof
CN111234712A (en) * 2019-12-23 2020-06-05 深圳日高胶带新材料有限公司 UV-cured optical pressure-sensitive adhesive and preparation method thereof
CN113897168A (en) * 2021-10-26 2022-01-07 湖北大学 UV (ultraviolet) viscosity-reducing glue solution, single-side UV viscosity-reducing protective film and preparation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140343186A1 (en) * 2011-12-19 2014-11-20 darbond technology co., ltd Ultraviolet cured optic binder
CN104449419A (en) * 2014-12-05 2015-03-25 烟台泰盛精化科技有限公司 Ultraviolet-heat dual curing optical adhesive containing epoxidized polybutadiene resin
CN106244030A (en) * 2016-07-28 2016-12-21 江苏乘鹰新材料股份有限公司 Photocurable adhesive compositions for cold transfer and preparation method thereof
CN111234712A (en) * 2019-12-23 2020-06-05 深圳日高胶带新材料有限公司 UV-cured optical pressure-sensitive adhesive and preparation method thereof
CN113897168A (en) * 2021-10-26 2022-01-07 湖北大学 UV (ultraviolet) viscosity-reducing glue solution, single-side UV viscosity-reducing protective film and preparation method

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