CN113416517A - Adhesive for preparing side reflection strip of light guide plate and preparation method and application thereof - Google Patents
Adhesive for preparing side reflection strip of light guide plate and preparation method and application thereof Download PDFInfo
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- CN113416517A CN113416517A CN202110763138.7A CN202110763138A CN113416517A CN 113416517 A CN113416517 A CN 113416517A CN 202110763138 A CN202110763138 A CN 202110763138A CN 113416517 A CN113416517 A CN 113416517A
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09J11/04—Non-macromolecular additives inorganic
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention provides an adhesive for preparing a side reflection strip of a light guide plate, a preparation method and an application thereof, wherein the adhesive comprises the following components in parts by weight: 10-20 parts of acrylate resin, 3-8 parts of cellulose resin, 20-30 parts of polyurethane acrylate resin, 30-40 parts of acrylate monomer, 1-5 parts of light curing agent, 1-5 parts of fumed silica and 4-8 parts of aluminum paste. The preparation method of the adhesive comprises the following steps: mixing acrylate resin, cellulose resin, polyurethane acrylate resin, an acrylate monomer, a light curing agent, fumed silica, aluminum paste and an optional coupling agent to obtain the adhesive. The adhesive has short curing time, and the prepared light guide plate side reflecting strip has strong bonding force, high reflectivity and ultraviolet aging resistance.
Description
Technical Field
The invention belongs to the technical field of light guide plate materials, and particularly relates to an adhesive for preparing a side reflection strip of a light guide plate, and a preparation method and application thereof.
Background
With the development of technology, the application of backlight materials and devices is becoming more and more widespread, and the production and manufacturing of backlight materials and devices are developing vigorously, but the backlight materials or devices are often in a situation of insufficient brightness in the design, for example, the light guide plate is often adhered with a reflective strip at the side of the light guide plate to increase the backlight brightness due to the insufficient brightness. The light guide plate side reflecting strip is a protective adhesive tape attached to the side edge of the light guide plate to prevent light leakage from the side edge of the light guide plate. After the light guide plate is produced, a light guide plate side reflective tape is attached to the side edge of the light guide plate. At present, when the side edge of the light guide plate is attached with the side edge reflection strip of the light guide plate, single pieces are usually attached by hand, namely, the pieces are manually attached one by one. The following problems exist in manual attachment: (1) the light guide plate and the reflection strip can not be completely aligned when being adhered, and the reflection strip and the light guide plate are hollow, so that the thickness of the backlight module is unqualified; (2) the light guide plate and the reflecting strip are not accurately pasted, so that the optics is not up to the standard; (3) the manual attaching production efficiency is low and manpower is wasted.
Therefore, it is necessary to use mechanical automatic attachment instead of manual attachment to solve the problems caused by manual attachment. For example, CN203512924U discloses an attaching device for light guide plate side reflection sheets, which is used for automatically attaching the side reflection sheets to improve the yield and efficiency of attaching the side reflection sheets. CN112505822A discloses attached tool of light guide plate and reflector plate, which comprises a tool body, the tool body is equipped with shaping portion and supporting part, the supporting part sets up in the top of shaping portion, the size of supporting part is greater than the size of shaping portion, the size adaptation of shaping portion is in the light guide plate size, the size adaptation of supporting part is in the size of preforming reflector plate, when stacking light guide plate and preforming reflector plate on the supporting part, through pressing light guide plate or preforming reflector plate, press light guide plate and preforming reflector plate to shaping portion from the supporting part, preforming reflector plate becomes the shaping reflector plate attached to on the light guide plate. CN210260606U discloses a light guide plate reflective tape attaching clamp, which comprises an operation platform, a supporting plate and a limiting unit, wherein the upper surface of the supporting plate is in contact with the light guide plate and is used for placing the light guide plate; the limiting unit is arranged at the edge of the supporting plate and is provided with a first limiting plane which can be superposed with the side edge of the light guide plate; the supporting base is arranged below the operation platform and used for supporting and fixing the operation platform; the supporting base comprises a base, and a main supporting unit, an auxiliary supporting unit and a blocking unit which are arranged on the upper surface of the base; the main supporting unit is movably connected with the supporting plate through a universal joint, and the supporting plate can rotate or swing relative to the axis of the main supporting unit; the auxiliary supporting unit is arranged at a position, close to the edge of the supporting plate, of the upper surface of the base, the blocking unit is arranged on one side, away from the main supporting unit, of the auxiliary supporting unit, the rotation of the light guide plate is used through the rotation of the operation platform, the abrasion between the light guide plates is reduced, and the product quality and the production efficiency are improved. At present, compared with a manual attaching side reflector, the process and the device can obviously improve the qualification rate and the efficiency of the attaching side reflector, but the process for attaching the light reflecting strips cannot fundamentally solve the poor attaching, improve the production efficiency and reduce the cost.
Therefore, in order to fundamentally solve the problems of poor lamination and low efficiency of the reflecting strip, the adhesive capable of being used as the reflecting strip on the side edge of the light guide plate is researched, automatic dispensing and photocuring are adopted, accurate dispensing and rapid curing are realized, and the adhesive has important practical significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an adhesive for preparing a side reflection strip of a light guide plate and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides an adhesive for preparing a side reflective strip of a light guide plate, which comprises the following components in parts by weight: 10-20 parts of acrylate resin, 3-8 parts of cellulose resin, 20-30 parts of polyurethane acrylate resin, 30-40 parts of acrylate monomer, 1-5 parts of light curing agent, 1-5 parts of fumed silica and 4-8 parts of aluminum paste.
In the invention, the acrylate resin component can reduce the contractibility of the adhesive, enhance the cohesive force and improve the curing speed of the system; the cellulose resin has the functions of increasing the dry film speed and inducing the aluminum silver paste powder to orient, and can improve the reflectivity of the reflecting strips on the side edge of the light guide plate; meanwhile, the silicon dioxide is compounded with the silicon dioxide component to play a role in adjusting the viscosity of the system; the polyurethane acrylate resin can increase the crosslinking density of the system and increase the binding power; the acrylate monomer participates in the reaction of the system, and has the functions of dilution and dissolution without adding extra solvent.
In the present invention, the acrylate resin in the adhesive component is 10-20 parts, for example, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts or 19 parts, and the specific values therebetween are not exhaustive, and for brevity and clarity, the specific values included in the range are not exhaustive.
In the invention, when the dosage of the acrylate resin is too small, the contractibility of the adhesive is reduced, the adhesive force is reduced, and the curing time is correspondingly increased; when the amount of the acrylate resin is too large, the brittleness of the glue is increased, the bonding strength is reduced, the viscosity of the glue is high, the construction is difficult, and the coating effect is poor, so that the reflectivity is low.
The cellulose resin in the adhesive component is 3-8 parts, for example, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts or 7.5 parts, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.
When the dosage of the cellulose resin is too small, the directional arrangement of aluminum paste is not facilitated, the reflectivity of the prepared light guide plate side edge reflection strip is too low, and the film forming speed is slow; when the dosage of the cellulose resin is too high, the glue has too high viscosity, hardness, brittleness and poor adhesion.
The urethane acrylate resin in the adhesive component is 20-30 parts, such as 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts or 29 parts, and the specific values therebetween are not exhaustive, and the specific values included in the range are not limited to the space and for the sake of brevity.
When the amount of the urethane acrylate resin is too small, the crosslinking degree in the system is low, and the adhesive force is reduced; when the amount of the urethane acrylate resin is too large, the viscosity of the glue is high, the processing is not facilitated, the hardness is low, and the adhesive force is reduced.
The acrylate monomer in the adhesive component is 30-40 parts, such as 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts or 39 parts, and the specific values therebetween are not exhaustive, and the invention is not limited to the specific values included in the ranges for brevity and conciseness.
The light curing agent in the adhesive component is 1-5 parts, for example, 1.2 parts, 1.5 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts or 4.9 parts, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.
The fumed silica in the adhesive component is 1 to 5 parts, for example, 1.2 parts, 1.5 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, or 4.9 parts, and specific values therebetween are not limited to the space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.
The aluminum paste content of the adhesive component is 4-8 parts, for example, 4.2 parts, 4.5 parts, 5 parts, 5.2 parts, 5.5 parts, 6 parts, 6.2 parts, 6.5 parts, 7 parts, 7.2 parts or 7.5 parts, and specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not intended to be limited to the specific values included in the ranges.
In the present invention, the acrylate resin is a thermoplastic acrylic resin.
Preferably, the weight average molecular weight of the acrylate resin is 30000-70000, and may be, for example, 32000, 35000, 40000, 42000, 45000, 50000, 52000, 55000, 60000, 65000 or 69000, and specific values therebetween, which are not exhaustive for the sake of brevity and conciseness, are included herein.
Preferably, the cellulose resin is a cellulose acetate butyrate resin.
Preferably, the molecular weight of the cellulose acetate butyrate resin is 20000 to 80000, for example, 22000, 25000, 30000, 32000, 35000, 40000, 42000, 45000, 50000, 52000, 55000, 60000, 65000, 69000, 70000, 72000 or 75000, and specific values therebetween are not exhaustive, but for brevity and conciseness, the invention does not provide an exhaustive list of specific values included in the range.
Preferably, the urethane acrylate resin comprises an aliphatic urethane acrylate oligomer and/or an aliphatic urethane acrylate oligomer.
Preferably, the molecular weight of the urethane acrylate resin is 2000 to 20000, for example, 3000, 5000, 7000, 9000, 10000, 12000, 15000, 17000, 18000 or 19000, and the specific values therebetween are limited to space and for the sake of brevity, and the invention is not exhaustive.
In the present invention, the acrylate monomer includes any one or a combination of at least two of tetrahydrofuran methacrylate, tetrahydrofuran ethyl acrylate, isobornyl methacrylate, hydroxyethyl methacrylate, 1, 6-hexanediol diacrylate, and trimethylolpropane triacrylate.
In the present invention, the light-curing agent includes any one or a combination of at least two of 1-hydroxycyclohexyl phenyl ketone, 2,4,6- (trimethylbenzoyl) diphenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzylphenyl) butanone, methyl benzoylformate, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide, 2-isopropylthioxanthone, benzoin bismethyl ether, dimethylbenzyl ketal, and benzophenone, more preferably 1-hydroxycyclohexyl phenyl ketone and phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide.
In the present invention, the particle size of the fumed silica is 20 to 60nm, for example, 25nm, 30nm, 35nm, 40nm, 45nm, 50nm, 55nm or 59nm, and specific values therebetween are limited by space and for brevity, and the specific values included in the ranges are not exhaustive.
Preferably, the aluminum paste is resin-coated aluminum paste.
Preferably, the adhesive further comprises 0.5-2 parts by weight of a coupling agent, which may be, for example, 0.6 part, 0.8 part, 1.0 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts or 1.8 parts by weight, and specific values therebetween, which are not intended to be limiting in space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the viscosity of the adhesive is 100000-180000, such as 110000, 120000, 130000, 140000, 150000, 160000 or 170000, and the specific values therebetween are limited to the space and for the sake of brevity, and the invention is not intended to be exhaustive of the specific values included in the range.
Preferably, the photo-curing time of the adhesive is 3 to 4s, for example, 3.1s, 3.2s, 3.3s, 3.4s, 3.5s, 3.6s, 3.7s, 3.8s or 3.9s, and specific values therebetween are not exhaustive, and for brevity, the invention is not exhaustive.
In a second aspect, the present invention provides a method for preparing the adhesive according to the first aspect, the method comprising the steps of: and mixing the acrylate resin, the cellulose resin, the polyurethane acrylate resin, the acrylate monomer, the light curing agent, the fumed silica, the aluminum paste and optionally a coupling agent to obtain the adhesive.
Preferably, the method of mixing is stirring.
Preferably, the stirring time is 60-90 min, for example, 62min, 65min, 68min, 70min, 72min, 75min, 78min, 80min, 82min, 85min, 88min or 89min, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the rotation speed of the stirring is 90-200 rpm, for example, 100rpm, 110rpm, 120rpm, 130rpm, 140rpm, 150rpm, 160rpm, 170rpm, 180rpm, 190rpm or 195rpm, and specific points therebetween, which are limited by space and for brevity, the present invention does not exhaust the specific points included in the range.
In a third aspect, the present invention provides a light guide plate side reflective strip, which is made of the adhesive according to the first aspect.
Preferably, the thickness of the light guide plate side reflective strips is 50-200 μm, such as 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 195 μm, and the specific values therebetween are limited by space and for brevity, the invention is not exhaustive.
Preferably, the light guide plate side reflective strips have a reflectivity of 45-55%, such as 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53% or 54%, and specific values therebetween are not exhaustive for brevity and conciseness.
Preferably, the light guide plate side reflection bar is prepared by a method comprising: and coating the adhesive on the side edge of the light guide plate in a dispensing manner, and performing photocuring to obtain the side edge reflection strip of the light guide plate.
Preferably, the thickness of the dispensing is 50-200 μm, for example, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 195 μm, and the specific values therebetween are not limited to the space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the irradiation intensity of light in the photocuring is 500-2000 mW/cm2For example, 600mW/cm may be used2、700mW/cm2、800mW/cm2、900mW/cm2、1000mW/cm2、1100mW/cm2、1200mW/cm2、1500mW/cm2Or 1900mW/cm2And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the wavelength of light in the photocuring is 200-410 nm, for example, 220nm, 240nm, 250nm, 280nm, 300nm, 320nm, 340nm, 350nm, 380nm, 400nm or 405nm, and specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not limited to the specific values included in the range.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the prepared adhesive has the light intensity of 1000mW/cm by compounding the acrylate resin, the cellulose resin, the polyurethane acrylate resin, the acrylate monomer, the light curing agent, the fumed silica and the aluminum paste in the adhesive2And the curing time is only 3-4 s, the prepared light guide plate side reflecting strip has strong adhesive force, the shearing strength can reach 10-13 MPa, the reflectivity can reach 45-55%, and meanwhile, the light intensity is 40mW/cm2The yellow stain does not occur after 1000 hours of illumination.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The following examples and comparative examples of the present invention use materials including:
(1) acrylate resin: mitsubishi BR 106;
(2) cellulose resin: istmann CAB-381-0.5;
(3) urethane acrylate resin: sartomer CN 8010;
(4) acrylate ester monomer: sartomer SR 256;
(5) fumed silica: watt's V15;
(6) aluminum paste: resin coated aluminum paste.
Examples 1 to 6
Embodiments 1 to 6 provide an adhesive for preparing a side reflective strip of a light guide plate, the adhesive comprising the following components: the formula of each component is shown in table 1, wherein the light curing agent of examples 1-6 is a combination of 1-hydroxycyclohexyl phenyl ketone and 2,4,6- (trimethylbenzoyl) diphenyl phosphorus oxide, and the amount of 2,4,6- (trimethylbenzoyl) diphenyl phosphorus oxide in the light curing agent of examples 1-6 is 1 part.
The preparation method of the adhesive comprises the following steps:
mixing acrylate resin, cellulose resin, polyurethane acrylate resin, an acrylate monomer, a light curing agent, fumed silica, aluminum paste and a coupling agent, and stirring at the rotating speed of 120rpm for 60min to obtain the adhesive.
Comparative examples 1 to 10
Comparative examples 1 to 10 provide an adhesive for preparing a side reflective strip of a light guide plate, the adhesive comprising the following components: the formula of each component is shown in table 1, wherein the light curing agent of comparative examples 1-10 is a combination of 1-hydroxycyclohexyl phenyl ketone and 2,4,6- (trimethylbenzoyl) diphenyl phosphorus oxide, and the amount of 2,4,6- (trimethylbenzoyl) diphenyl phosphorus oxide in the light curing agent of comparative examples 1-10 is 1 part. The adhesive was prepared in the same manner as in example 1.
TABLE 1
Application examples 1-6 and comparative application examples 1-10
Application examples 1-6 and comparative application examples 1-10 provide light guide plate side reflective strips made from the adhesives provided in examples 1-6 and comparative examples 1-10, prepared as follows: the adhesives provided in examples 1-6 and comparative examples 1-10 were dispensed onto the sides of the light guide plate, and placed in a UV LED lamp box (AVENTK XL220) with a wavelength of 365nm and a light intensity of 1000mW/cm2And carrying out photocuring to obtain the side reflecting strip of the light guide plate, wherein the thickness of the side reflecting strip is 100 microns.
And (3) performance testing:
(1) and (3) testing curing time: the light guide plate side edge reflection strips provided in application examples 1-6 and comparative application examples 1-10 were placed in an LED light box to start timing until the surface of the adhesive film was dry and there was no fingerprint indicating that curing was complete, and the time taken for curing was obtained, as shown in table 2.
(2) And (3) testing the shear strength: the most common material PC is used as a base material, a lap joint experiment is carried out, a tensile force tester (Dongguan Jinton equipment Co., Ltd., SY-500 type) is adopted to carry out a shear strength test on the side reflection strip of the light guide plate provided by application examples 1-6 and comparative application examples 1-10, and the formula is as follows: shear strength-maximum tensile force/bonding area (in MPa); curing energy 3000MJ/cm2The test results are shown in table 2.
(3) And (3) ultraviolet light resistance test: the light guide plate side reflective strips provided in application examples 1 to 6 and comparative application examples 1 to 10 were placed at a light intensity of 40mW/cm2The LED lamp box (AVENTK XL220) is irradiated for 1000 hours, and the test results are shown in Table 2.
(4) And (3) OD value test: OD is an abbreviation for optical density, which indicates the optical density absorbed by the test article, and OD ═ lg (1/trans), where trans is the transmission of the test article. Therefore, it is also called light transmittance, also called absorbance. The light guide plate side reflective strips provided in application examples 1 to 6 and comparative application examples 1 to 10 were read in an OD value tester with the test equipment x-rite 341c, and the test results are shown in table 2.
(5) And (3) reflectivity testing: the strip with a thickness of 100 μm was read in a two-beam UV-Vis spectrophotometer (Prov., TU-1901) and the test results are shown in Table 2.
TABLE 2
According to the data in table 2, the components in the adhesive for preparing the light guide plate side edge reflection strip are compounded to generate a synergistic effect, so that the finally prepared light guide plate side edge reflection strip has the light intensity of 1000mW/cm2The curing time is only 3-4 s, the adhesive force is strong, the shearing strength can reach 10-13 MPa, the reflectivity can reach 45-55%, and meanwhile, the light intensity is 40mW/cm2The yellow stain does not occur after 1000 hours of illumination.
When the adhesive component does not contain cellulose resin or contains too little cellulose resin (compared with application examples 1 and 2), the directional arrangement of the aluminum-silver paste powder is not facilitated, so that the reflectivity of the reflecting strip on the side edge of the light guide plate is reduced, the dry film speed is low, and the curing time is prolonged; when the content of the cellulose resin is too large, the adhesion of the reflective tape is deteriorated, and the reflectivity of the reflective tape is also decreased. When the content of the acrylate resin is too small or too large, the adhesive force of the reflecting strip is influenced, the strength of the adhesive film is reduced, and when the content of the acrylate resin is too small, the yellowing resistance of the reflecting strip is reduced. When the content of the urethane resin is too small or too large, the adhesion of the reflective tape is deteriorated, and when the content is too small, the yellowing resistance of the reflective tape is affected. When the content of the acrylate monomer is too small or too large, the adhesive force of the reflecting strip is reduced, and the reflectivity is also reduced; when the content is too large, the curing time of the adhesive becomes long, and the yellowing resistance of the reflective tape is lowered. When no silica is present in the system components, the reflectivity of the reflective strips is reduced and the coating effect is slightly poor.
The applicant states that the adhesive for preparing the side reflective strips of the light guide plate and the preparation method and application thereof are described by the above embodiments, but the invention is not limited to the above embodiments, i.e. the invention is not meant to be implemented only by relying on the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The adhesive for preparing the side reflecting strip of the light guide plate is characterized by comprising the following components in parts by weight: 10-20 parts of acrylate resin, 3-8 parts of cellulose resin, 20-30 parts of polyurethane acrylate resin, 30-40 parts of acrylate monomer, 1-5 parts of light curing agent, 1-5 parts of fumed silica and 4-8 parts of aluminum paste.
2. The adhesive of claim 1, wherein the acrylate resin is a thermoplastic acrylic resin;
preferably, the weight average molecular weight of the acrylate resin is 30000-70000;
preferably, the cellulose resin is a cellulose acetate butyrate resin;
preferably, the molecular weight of the cellulose acetate butyrate resin is 20000-80000;
preferably, the urethane acrylate resin includes an aliphatic urethane acrylate oligomer and/or an aromatic urethane acrylate oligomer;
preferably, the molecular weight of the urethane acrylate resin is 2000-20000.
3. The adhesive according to claim 1 or 2, wherein the acrylate monomer comprises any one of or a combination of at least two of tetrahydrofuran methacrylate, tetrahydrofuran ethyl acrylate, isobornyl methacrylate, hydroxyethyl methacrylate, 1, 6-hexanediol diacrylate, or trimethylolpropane triacrylate.
4. An adhesive according to any one of claims 1 to 3, wherein the light curing agent comprises any one of 1-hydroxycyclohexyl phenyl ketone, 2,4,6- (trimethylbenzoyl) diphenyl phosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzyl) butanone, methyl benzoylformate, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide, 2-isopropylthioxanthone, benzoin bismethyl ether, dimethyl benzil ketal or benzophenone, or a combination of at least two thereof, further preferred is a combination of 1-hydroxycyclohexylphenylketone and phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide.
5. The adhesive according to any one of claims 1 to 4, wherein the fumed silica has a particle size of 20 to 60 nm;
preferably, the aluminum paste is resin-coated aluminum paste;
preferably, the adhesive further comprises 0.5-2 parts by weight of a coupling agent.
6. The adhesive according to any one of claims 1 to 5, wherein the viscosity of the adhesive is 100000 to 180000;
preferably, the photo-curing time of the adhesive is 3-4 s.
7. A method for preparing an adhesive according to any one of claims 1 to 6, comprising the steps of: and mixing the acrylate resin, the cellulose resin, the polyurethane acrylate resin, the acrylate monomer, the light curing agent, the fumed silica, the aluminum paste and optionally a coupling agent to obtain the adhesive.
8. The method of claim 7, wherein the mixing is performed by stirring;
preferably, the stirring time is 60-90 min;
preferably, the rotating speed of the stirring is 500-1000 rpm.
9. A light guide plate side reflective strip, wherein the light guide plate side reflective strip is made by the adhesive according to any one of claims 1 to 6;
preferably, the thickness of the reflecting strip at the side of the light guide plate is 50-200 μm;
preferably, the reflectivity of the reflecting strips at the side of the light guide plate is 45-55%.
10. The light guide plate side reflector strip as claimed in claim 9, wherein the light guide plate side reflector strip is prepared by a method comprising: coating the adhesive on the side edge of the light guide plate in a dispensing manner, and performing photocuring to obtain the side edge reflection strip of the light guide plate;
preferably, the dispensing thickness is 50-200 μm;
preferably, the irradiation intensity of light in the photocuring is 500-2000 mW/cm2；
Preferably, the wavelength of light in the photocuring is 200-410 nm.
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| CN202110763138.7A CN113416517B (en) | 2021-07-06 | 2021-07-06 | Adhesive for preparing side reflection strip of light guide plate and preparation method and application thereof |
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