Different-direction light transmission low-viscosity glue composition

Abstract

The invention discloses a low-viscosity glue composition with light transmission in different directions, and relates to the technical field of optical glue. The coating comprises organic resin, a photoinitiator, a black filler, micron-sized powder and other functional aids, the other functional auxiliary agents comprise at least one of a defoaming auxiliary agent, an antioxidant and an adhesion promoter; the organic resin has an acrylate group or an epoxy group, so that the final glue composition has reaction performance and can be subjected to photocuring reaction, the optical refractive index of the glue composition is 1.5 or above at room temperature after the glue composition is uniformly mixed, and the room-temperature viscosity is 5cps to 2000cps. Bubbles are prevented from being generated in the application process; the colloid has a certain optical shielding property and can control the light transmissivity of the bonding surfaces of the two pieces of spliced glass; a special surface structure can be formed on a non-bonding surface, so that the phenomena of light reflection, light leakage and the like on the surface of the glue are avoided, and obvious visual stripes caused by reflected light of the glue can be reduced and even avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical glue, and in particular relates to a low-viscosity glue composition with different light transmittance in different directions. Background Art

[0002] Optical glass splicing technology is a core component of precision optical manufacturing and is widely used in large-scale displays, AR / VR optical modules, high-end optical instruments, and consumer electronics. With the development of display technology toward ultra-high definition, flexibility, and large sizes, and the increasing demand for lightweight and integrated optical systems, high-precision, seamless splicing of multiple pieces of optical glass has become a key technology for achieving high-performance optical devices. Furthermore, displays often require shielding components or using shading to prevent light leakage.

[0003] In order to solve the above problems, CN110922916A discloses an optical adhesive layer and preparation method, a display device and preparation method, and a terminal device. By spraying or sprinkling water-based dark or light-colored ink on the uncured optical adhesive layer body, a light-shielding material layer is formed in a set area thereof, and the light-shielding material is infiltrated into the adhesive layer body to form a shielding layer. This solution achieves the light-shielding effect by infiltrating the optical adhesive with ink; however, this invention technology may have poor compatibility between water-based ink and optical adhesive, different infiltration depths, resulting in uneven surface thickness, and pores or bubbles are easily caused by volatilization when baking the solvent. For example, CN113329877A discloses optical adhesive and its preparation method, and a display panel; this solution uses ink to apply to both ends of the base film, and the area of ​​the ink layer is smaller than that of the base film. Then, the optical adhesive is applied to the base film and covers the ink layer to avoid loose interface bonding with the cover plate with the ink layer when the optical adhesive is bonded to the cover plate with the ink layer, resulting in gaps, which leads to a decrease in display effect. This patent achieves the application requirements of shielding and light transmittance through ink glue and optical glue respectively, and a low-viscosity glue composition with different directions of light transmittance prepared by the present invention can realize the integration of light transmittance of the bonding surface and light shielding of the non-bonding surface, simplifying the preparation process in the process of optical glass seam splicing. For example, CN222189630U discloses a liquid crystal display screen that prevents overflow of OCA optical glue. The OCA optical glue of this solution is arranged between the polarizer and the cover plate. The lower surface of the cover plate is provided with an overflow groove surrounding the OCA optical glue. The edge of the lower surface of the cover plate is provided with light-shielding ink, and the light-shielding ink is coated on the outer surface of the overflow groove and the lower surface of the cover plate. Since the lower surface of the cover plate is provided with an overflow groove surrounding the OCA optical glue, when the OCA optical glue is pressured to overflow, the excess glue will flow into and be stored in the overflow groove to prevent it from continuing to diffuse outward, thereby limiting the scope of overflow. It can effectively avoid overflow of OCA optical glue, which will cause the display module to be unable to be assembled and the backlight module to leak light. This patent effectively avoids OCA glue overflow through the special structural design of the substrate, and sets light-shielding ink to prevent light leakage. This solution effectively avoids light leakage through the dual measures of structural design of the substrate and adding an ink layer, but the process is relatively complicated and the bonding strength between OCA and light-shielding ink needs to be considered.

[0004] Therefore, conventional display screens typically form a layer of shading material in designated areas requiring shading. This shading material is typically dark or light-colored ink. This shading layer blocks the components to be shielded or serves to prevent light leakage. However, when optical adhesive is bonded to a substrate with an ink layer, a step difference exists between the two layers, resulting in a loose bond interface with gaps. This easily generates bubbles, resulting in a reduced display quality. During production, the adhesive is prone to peeling and falling off, affecting product yield. Furthermore, this process is complex, and there is a risk of loose bonding between the intermediate optical adhesive layer and the ink layer. Therefore, this technical solution proposes a low-viscosity adhesive composition with anisotropic light transmittance. Summary of the Invention

[0005] The present invention provides a low-viscosity glue composition with different light transmittance in different directions, which is a low-viscosity glass seam splicing light-curing glue with light transmittance on the bonding surface and optical shielding and non-reflection on the non-bonding surface. The refractive index of the light-curing glue at room temperature (25°C) is equal to or greater than 1.5, and the viscosity is maintained at 5cps~2000cps. The optical glue of the present invention can be filled in the gap between two layers of optical glass by capillary diffusion, and the bonding surface can have a transmittance of 5%~90%, while the non-bonding surface can achieve a light-shielding effect. The effect of integrating the light transmittance of the bonding surface and the light-shielding property of the non-bonding surface is achieved mainly by changing the visible light absorption of the glue and forming a non-reflective structure on the surface after curing. Compared with the existing technology, the preparation process of the optical device is simplified, and the light leakage problem of the optical device can be effectively improved because the light glue has strong adhesion to optical glass. In summary, the problems in the background technology are solved.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention discloses a low-viscosity adhesive composition with anisotropic light transmittance, whose composition, calculated by weight, is as follows: 50 to 95 parts by weight of a resin having a certain optical refractive index, 0.1 to 10 parts by weight of a photoinitiator, 0.001 to 10 parts by weight of a black filler, 0.01 to 20 parts by weight of a micron-sized powder (with a powder diameter between 5 μm and 50 μm), and 0.01 to 10 parts by weight of other functional additives, wherein the other functional additives include a defoaming agent, an antioxidant, and an adhesion promoter.

[0008] To achieve the reactivity of light-curing adhesives, the resin used must contain acrylate or epoxy groups to make the final resin formula reactive and capable of light-curing. Furthermore, after uniform mixing, the overall resin must have an optical refractive index of 1.5 or higher at room temperature. The room-temperature viscosity of the overall resin formula must be between 5 cps and 2000 cps.

[0009] Furthermore, the resin may be a single or multiple acrylate oligomers, acrylate monomers, epoxy resins, or organic resins having both acrylate groups and epoxy groups.

[0010] Furthermore, the acrylate oligomer is a commercially available raw material. The following examples illustrate some of the commercially available raw materials involved in the present invention: MIRAMER PU2100, MIRAMER PU2560, MIRAMER PU320, MIRAMERPU3450, MIRAMER MU9800, MIRAMER MU9500, MIRAMER MU3603, MIRAMER PU2421NT, MIRAMERPE210, MIRAMER PE250, MIRAMER SC6300, MIRAMER PE230, MIRAMER EA2235, MIRAMEREA2259, MIRAMER EA2280, MIRAMER PE110H, MIRAMER PE310, MIRAMER ME2110, MIRAMERHR6042, MIRAMERHR6100, MIRAMER HR6200, etc.; SUO-210, SUO-7301, SUO-1020NI, SUO-4130TF, SUO-4140I10, SUO-9103I20, SUO-3110H20, SUO-3210, SUO-300, SUO-7620TF, SUO-7630, SUO-7640, SUO-7650, SUO-7910, SUO-7920, SUO-H8130, SUO-H8803, SEA-820, SEA-700BA20, SUO-544, SEA-Z250 selected from SHIN-A,Selected from Changxing 6106, 611B-85, 6112-100, 6112-100NT, 6115J-80, 6113, 61329, 61362, 6142H-80, 6145-100NT, 6148J-75NT, 615-100, 6157B-80, DR-U021, DR-U028FS, DR-U079, DR-U096, DR-U161, DR-U168, DR-U210, DR -U240, DR-U249, DR-U250, DR-U282, DR-U299, DR-U301, DR-U317, DR-U319, DR-U330, DR-U356, DR-U360D , DR-U361-1, DR-U367-1, DR-U384, DR-U388, 621-100, 6202, 620-100, 621A-80, 621C-60, 621G-80, 6215- 100, 6219-100, 622A-80, 623A-80, 624-100, 6235, 625C-45, 6255, 6260, 6261M, 6270, DR-G902, DR-G915 , DR-G961, 6312-100, 6313-100, 63158, 6333-100, 63421, 6371, 6372, DR-E505, DR-E505-1, DR-E524, DR -E532, DR-E630, DR-E650, DR-E661, etc., selected from FSP5806, FSP5508, FSP5680, LuCure5134, LuCure5748, LuCure5018, LuCure5208, LuCure5808, LuCure5532, LuCure8160, FSP5894, LuCure5022, LuCure5558 of Guangzhou Runao Chemical Materials,A mixture of one or more of CN131 NS, CN131B NS, CN104 NS, CN104TFN, CN104A80 NS, CN110 NS, CN120 NS, CN115 NS, CN159 NS, CN2003 NS, CNUVE151 NS, CNUVE151 TFN, CN150 / 80 NS, CN111LV NS, CE208 NS, CE209 NS, CN8888 NS, CN9178 NS, CN981A NS, CN996 SFN, CN8899 NS, SPA8002 NS, CN9006 NS, CN8885 NS, CN2270 NS, CN2283 NS, CN7001 NS, CN790 NS, CN8200 NS, and CN2560 NS. ,

[0011] The acrylic monomer is selected from monofunctional or multifunctional diluent monomers commonly available on the market. The following examples illustrate some of the raw materials on the market involved in the present invention: MIRAMER M100, MIRAMER M1110, MIRAMER M1130, MIRAMER M1142, MIRAMER M1150, MIRAMER M1182, MIRAMER M130, MIRAMER M140, MIRAMER M142, MIRAMER M144, MIRAMER M150, MIRAMER M164, MIRAMER M166, MIRAMER M1602, MIRAMER M170, MIRAMER M180, MIRAMER M200, MIRAMER M202, MIRAMER M210, MIRAMER M216, MIRAMER M2101, MIRAMER M220, MIRAMER M240, MIRAMER MIRAMER M4004, MIRAMER M410, MIRAMER M420, MIRAMER M500, MIRAMER M600, MIRAMER M1183, MIRAMER M141, MIRAMER M241, etc., selected from Changxing's EM105, EM204-T, EM2050, EM2051, EM2103, EM2181, EM310, EM3105, EM75, EM77DN, EM90, EM93, EM2204, EM2208, EM2261, EM2263, EM2266, M2269, EM227, EM2280, EM3206 , EM3230, EM3260, EM3261, EM3265, EM2308, EM2308-1, EM231, EM235, EM235-1, EM2380, EM 2386, EM3380, EM3382, EM2411, EM242HW, EM2421, EM264, EM265, EM266, EM266HSM, EM267, etc.,Select from Sartomer's SARBIO®5102 NS, SR506NS, SARBIO®6105 NS, SR339 NS, SR340 NS, SR420 NS, SR421A NS, SR285 NS, SR285 TFN, SR203 NS, SR531 NS, SR217 NS, SR335, SR313 NS, SR395 NS, SR504 NS, SR551 NS, SR256NS, SR306 NS, SR306 TFN, SR9003 NS, SR213, SR348 NS, SR349, SR601 NS, SR602 NS, SR351NS, SR350 NS, SR454 NS, SR499 NS, SR502 NS, SR9035, SR9020 NS, SR533 NS, SR507 NS, SR368D NS, SR355 NS, SR355 TFN, SR494 NS, SR399 NS, SR899 NS, etc., is a mixture of one or more of GM61H0A, GM61HR0, GM61Z00, GM62E2P, GM62R0E, GM62R3E, GM62R4E, GM62RPE, GM82R0E, GM82R4E, GM63C00, GM63C6E, GM63C9E, M63CFE, GM63CTE, GM63F0A, GM63T00, GM63X00, GM64F5E, GM66G00, GM66G0A, GM66G1A, GM66G0C, GM83C0Q, GM63C0F, GM64U0A, GM64U00, etc. of Guojing Chemical.

[0012] Furthermore, epoxy resin is a common raw material available on the market. The following examples illustrate some of the raw materials available on the market involved in the present invention: EP-4100HF, EP-4901HF, EP-40000L, ED-509S, ED-503G, ED-523L from ADEKA, OXT-101, OXT-212, OXT-121, OXT-221 from TOAGOSEI, CELLOXIDE 2021P, CELLOXIDE8010, CELLOXIDE 2081, CELLOXIDE 2000, EHPE 3150, EHPE 3150CE, EPOLEAD GT401, CYCLOMER M100, EPOLEAD PB3600, EPOLEAD PB4700, EPOFRIEND AT501, EPOFRIEND CT310, etc., DIC's HP-4032D, N-730A, EXA-830CRP, EXA-830LVP, EXA-835LV, EXA-850CRP, etc., Mitsubishi Chemical's YL980, YX8040D, YX8000D, YL983U, JER 1750, Zhilun New Materials' ZLA-175H, ZLA-185H, ZLA-450H, ZLA-600H, ZLA-160H, ZLA-170H, ZLA-165H, ZLA-4000H, ZLA-4010, ZLA-140S, ZLA-694B, ZLA-622B, ZLA-693B, etc., Syna-epoxy-51, Syna-Epoxy-28E, Syna One or more combinations of Syna S-30, Syna S-32, Syna S-610, Syna S-06E, Syna S-07, Syna S-09, Syna S-10E, Syna S-21E, Syna S-27 (HQ), Syna S-60, Syna S-100, Syna S-101, Syna S-182, Syna S-184, SynaS-221, etc.

[0013] Furthermore, organic resins having acrylate groups and epoxy groups are commercially available raw materials. The following examples illustrate some of the commercially available raw materials involved in the present invention: a mixture of one or more selected from CN153 NS from Sartomer, SEA-H187AI, SEA-A130H, SEA-A150H, SEA-A170H, SEA-F130H, SEA-F150H, SEA-F170H, etc. from SHIN-A.

[0014] Furthermore, depending on the final resin composition, the photoinitiator may be a cationic initiator alone (100% epoxy resin), a free radical initiator alone (100% acrylate), or a combination of a cationic initiator and a free radical initiator (in any proportion or as a mixture of similar resins). The photoinitiator is a free radical photoinitiator selected from the group consisting of α-hydroxyketone photoinitiators, benzoin compounds, acylphosphine oxide photoinitiators, acetophenone photoinitiators, acetophenone photoinitiators, morpholinyl ketone photoinitiators, diphenyl iodonium hexafluoroantimonate, diphenyl iodonium hexafluoroarsenate, diphenyl iodonium hexafluorophosphate, iodonium fluoroborate, aryldiazonium salts, and ferrocene. Preferably, one or more combinations of strong new materials such as TR-1173, TR-184, TR-1173, TR-TPO, TR-NPI-601, TR-TPO-L, TR-907, TR-369, TR-379, TR-BDK, TR-BP, TR-CBP, TR-4-PBZ, TR-MBF, TR-4-MBP, TR-NI-501, TR-PPI-101, TR-PPI-101S, TR-PPI-ONE, TR-NPI-50103, TR-PAG-201, TR-PAG-202, TR-PAG-20101, TR-PAG-20102, TR-PAG-23401, TR-PAG-30101, TR-PAG-30201, and TR-PAG-30301P are used.

[0015] Furthermore, the black filler is one or more combinations of carbon black, black iron oxide, and silicon aluminum carbon black. The following examples illustrate some of the raw materials available on the market involved in the present invention: RAVEN 7000, RAVEN 5000 ULTRA, RAVEN 3600 ULTRA, RAVEN 3500, RAVEN 2500 ULTRA, RAVEN 2300 ULTRA, RAVEN 2000, RAVEN 1255, RAVEN 1250, RAVEN 1200, RAVEN 1180, RAVEN 1080 ULTRA, RAVEN 1060 ULTRA, RAVEN 1035, RAVEN 1010, RAVEN 1000, RAVEN 860 ULTRA, RAVEN 760 ULTRA, RAVEN 450, RAVEN 430 ULTRA, RAVEN 425 ULTRA, RAVEN 14, RAVEN L, RAVEN H20, RAVEN P5 ULTRA, CONDUCTEX7055, CONDUCTEX K, one or more combinations of Mitsubishi Chemical's #2900B, #2650, #2350, #1000, #980, #970, #960, MA600, MA7, MA8, MA 11, MA100, MA220, MCF88, #52, #85, #95, #47, #45, #45L, #40, #30, #25, #10, #5, Sunshine Advanced Materials' TD890, TD900, TD888, TD788, TD589P, TD488P, TD588P, TD688, TD122, TD788A, TD180, TD317A, TD369P, TD488, TD300, TD505P, TD157, TD146, etc.

[0016] Furthermore, the diameter of the micron-sized powder is preferably between 5 μm and 50 μm, and is preferably a combination of one or more of silicon dioxide, kaolin, talc, diatomaceous earth, low molecular weight thermoplastic resin, silicone resin, etc.The following examples illustrate some of the raw materials available on the market involved in the present invention: Tospearl 120E, TSR9000, TSR9002, and CoatOSil DSA6 from Momentive; SIPERNAT® 820A, SIPERNAT® 830 (ZEOLEX 330), SIPERNAT® 833, SIPERNAT® 835 (ZEOLEX 325), S160, S200, S288, S310, S380, 22S, 44MS, 50S, 622LS, YH180B, YH200, 22PC, 2200PC, 11PC, ACEMATT HK125, ACEMATT HK400, ACEMATT HK440, ACEMATT OP278, ACEMATTHK450, ACEMATT HK460, ACEMATT OK412, ACEMATT OK 412LC, ACEMATT OK500, ACEMATTOK520, ACEMATT OK607, ACEMATT 3600, A790, A810, OK900, OK390, HK390, HK520, OK630, Imerys’ C490, C499, C503, C263LD, C287, Infilm 300, E0309, E0530, Hydrite UF90, HydriteUF9OS, Hydrite Ts90, Hydrite Ts90S, Hydrite PXNLC, Hydrite PXNLCS, Hydrite PXNLED, Eckalite ED, Nanjing Tianshi New Materials' PEW-0511, PEW-0200, PEW-0274, PPW-0901, PPW-0902, PPW-0903, PPW-0911, PPW-0921, PPW-0922, PPW-0931, PPW-0936, Grace's SYLOWHITE® SM405, SYLOID® C 503, SYLOID® C 803, SYLOID® C 805, SYLOID® C 807, SYLOID® C809, SYLOID® C 906, SYLOID® C 907, etc., one or more combinations of Liangjiang titanium dioxide chemical products' LJ-401, LJ-612, LJ-601, LJ-553, LJ-801, LJ-320, LJ-211, LJ-110, LJ-312, R920, R996, R944, etc.

[0017] Furthermore, other functional additives include defoaming agents, antioxidants and adhesion promoters.

[0018] Further defoaming agents are all commercially available raw materials. Some examples are listed below: one or more selected from BYK's BYK-011, BYK-012, BYK-014, BYK-015, BYK-016, BYK-017, BYK-018, BYK-019, BYK-021, BYK-051, BYK-052, BYK-053, BYK-054, BYK-057, BYK-1765, BYK-1788, BYK-065, BYK-066N, BYK-170, BYK-077, BYK-141, BYK-024, BYK-310, BYK-378, BYK-035, etc.

[0019] Furthermore, the antioxidant is one or more of hindered phenols, hindered amines, and phosphates, preferably BASF's antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 245, antioxidant 1330, antioxidant 3114, IRGAFOS168, IRGAFOS 38, IRGAFOS 126, etc., and Qitai Chemical Technology's Revonox 501, Revonox 420, Revonox420V, Revonox 608, Revonox 6PLUS, Deox 1412, RevonoxU 5024, RevonoxU 5035, DeoxMD1024, Chiguard 234, etc., or one or more combinations thereof.

[0020] Furthermore, the adhesion promoter is mainly a silane coupling agent, preferably one or more combinations of γ-aminopropyltriethoxysilane (KH-550), γ-(2,3-epoxypropyloxy)propyltrimethoxysilane (KH-560), γ-(methacryloyloxy)propyltrimethoxysilane (KH-570), N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane (KH-602), N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (KH-792), vinyltrimethoxysilane (A-171), etc.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Low viscosity, avoiding bubbles during application, suitable for capillary diffusion processes in micro-gap splicing of optical glass, displays, etc.

[0023] (2) Optical shielding: The colloid itself has a certain optical shielding property, which can control the light transmittance of the bonding surface of the two spliced ​​glass panels. By changing the visible light absorption of the glue and forming a non-reflective structure on the surface after curing, the light transmittance of the bonding surface and the light shielding of the non-bonding surface are integrated. Compared with the existing technology, the preparation process of optical devices is simplified, and it has strong adhesion to optical glass, which can effectively improve the light leakage problem of optical devices.

[0024] (3) Avoiding colloid reflection and light leakage: A special surface structure can be formed on the non-bonded surface to avoid reflection, light leakage and other phenomena on the colloid surface, and reduce the obvious visual stripe phenomenon caused by the splicing slit glue on the overall optical display system; the refractive index of the optical glue prepared by the present invention is maintained at 1.50 or above in the visible light range of 589nm, and the viscosity is maintained at 5cps~2000cps at room temperature of 25℃. By changing the amount of black filler used, the ability of the colloid itself to absorb wavelengths in the visible light band is adjusted, thereby controlling the light shielding property of the colloid itself;

[0025] (4) The present invention uses micron powders of a specific particle size to produce a special surface structure on the adhesive surface exposed to the air during light curing, thereby reducing the reflection of the non-adhesive surface of the adhesive, thereby reducing or even avoiding obvious visual streaks caused by the glue reflecting light;

[0026] (5) The optical adhesive of the present invention can realize the integration of light transmittance of the bonding surface and light shielding of the non-bonding surface, thereby simplifying the preparation process during the optical glass seam splicing process.

[0027] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a diagram illustrating the mechanism of action of a low-viscosity glue composition with different light transmittance in different directions according to the present invention;

[0030] Figure 2 The non-adhesive surface is a photograph showing the surface of the colloid after curing based on the comparative example and the embodiment;

[0031] Figure 3 The photographs are provided to illustrate the light transmittance in different directions between the bonding surface and the non-bonding surface based on the comparative example and the embodiment;

[0032] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0033] 1-light source, 2-optical glass, 3-glue composition, 4-non-adhesive surface, 5-adhesive surface. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The present invention discloses a low-viscosity adhesive composition with anisotropic light transmittance, wherein the anisotropic light transmittance is characterized by a certain transmittance on the bonding surface and light-shielding and non-reflective properties on the non-bonding surface. The composition, calculated by weight, is as follows: 50 to 95 parts by weight of a resin with a certain optical refractive index, 0.1 to 10 parts by weight of a photoinitiator, 0.001 to 10 parts by weight of a black filler, 0.01 to 20 parts by weight of a micron-sized powder (with a powder diameter between 5 μm and 50 μm), and 0.01 to 10 parts by weight of other functional additives, including a defoaming agent, an antioxidant, and an adhesion promoter.

[0036] like Figure 1 , which is a diagram illustrating the mechanism of action of a low-viscosity adhesive composition with different light transmittance according to the present invention, wherein reference numeral 1 represents a light source; 2 represents optical glass; 3 represents the adhesive composition of the present invention, i.e., optical adhesive; 4 represents a non-bonding surface, specifically, the interface between the optical adhesive of the present invention and the non-optical glass; and 5 represents a bonding surface, specifically, the interface between the optical adhesive of the present invention and the optical glass.

[0037] When the glue prepared using this invention is used to fill the gap between two optical glass panels, the non-bonded surface, free to shrink because it doesn't contact the glass, shrinks during curing. This causes the micron-sized powders claimed in this patent to concentrate and expose numerous tiny irregularities on the surface. When light strikes these irregularities, it reflects at angles different from normal, or even is absorbed by the black filler and not reflected, significantly reducing surface reflections. Furthermore, shrinkage further concentrates the micron-sized powders and black filler, further reducing light transmittance on the non-bonded surface and effectively preventing light leakage from internal light sources on the non-bonded surface of optical devices. On the bonded surface, however, because the bonded surface is flat glass, there are no surface or interface irregularities. Transmittance is primarily controlled by the proportion of black filler in the glue formula. Therefore, during the actual application of the optical glue of the present invention, when external light shines on the non-bonding surface, the glue surface of the present invention does not reflect the light, so the bright line generated on the non-bonding surface cannot be observed by the naked eye. This solves the application requirements of conventional applications that require the use of two types of glue, ink glue and optical glue, to achieve shielding and light transmittance. That is, one glue is used to bond the glass to provide bonding and light transmittance, while the other glue is applied to the area to be shielded to avoid light leakage caused by the bright line.

[0038] The present invention discloses a low-viscosity glue composition with anisotropic light transmittance, a preparation method, and an application thereof. The composition is calculated as follows in parts by weight: 50 to 95 parts by weight of a resin with a certain optical refractive index, 0.1 to 10 parts by weight of a photoinitiator, 0.001 to 10 parts by weight of a black filler, 0.01 to 20 parts by weight of a micron-sized powder (powder diameter between 5 μm and 50 μm), and 0.01 to 10 parts by weight of other functional additives, which include a defoaming agent, an antioxidant, and an adhesion promoter.

[0039] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0040] Example 1

[0041] A low-viscosity adhesive composition with anisotropic light transmittance is disclosed. The components of this embodiment include the following raw materials, measured in parts by weight: 60.00 parts of CN104 NS, 40.00 parts of MIRAMER M140, 0.01 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0042] Example 2

[0043] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured by weight: 40.00 parts of CN104 NS, 60.00 parts of MIRAMER M140, 0.01 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0044] Example 3

[0045] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured by weight: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.01 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH570, and 0.50 parts of antioxidant 1010.

[0046] Example 4

[0047] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured by weight: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.05 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0048] Example 5

[0049] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured in parts by weight: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.20 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0050] Example 6

[0051] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured by weight: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.50 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0052] Example 7

[0053] A low-viscosity adhesive composition with anisotropic light transmittance. The components of this embodiment include the following raw materials, measured by weight: 70.00 parts of CELLOXIDE 2021P, 30.00 parts of ED-509S, 0.20 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-PAG-202 photoinitiator, 2.00 parts of coupling agent KH-560, and 0.50 parts of antioxidant 1010.

[0054] Example 8

[0055] A low-viscosity adhesive composition with different optical transmittance is disclosed. The components of this embodiment include the following raw materials, measured in parts by weight: 50.00 parts of SEA-H187AI, 50.00 parts of GM61P00, 0.20 parts of RAVEN 3500, 5.00 parts of OK412 (particle size 6 μm), 0.10 parts of BYK-0653, 1.00 parts of TR-TPO-L photoinitiator, 1.00 parts of TR-PAG-202 photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0056] Comparative Example 1

[0057] The components of this comparative example, calculated in parts by weight, include the following raw material components: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.20 parts of RAVEN 3500, 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0058] Comparative Example 2

[0059] The components of this comparative example, calculated in parts by weight, include the following raw material components: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.50 parts of RAVEN 3500, 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0060] Comparative Example 3

[0061] The components of this comparative example, calculated in parts by weight, include the following raw material components: 40.00 parts of CN104 NS, 60.00 parts of GM61P00, 0.50 parts of RAVEN 3500, 5.00 parts of DENKA SFP-20M (particle size: 0.4 μm), 0.10 parts of BYK-0653, 2.00 parts of TR-TPO-L photoinitiator, 2.00 parts of coupling agent KH-570, and 0.50 parts of antioxidant 1010.

[0062] The performance of a low-viscosity adhesive composition with different light transmittance in different directions was tested on the above-mentioned embodiment and comparative example by the following method. The specific sample preparation and testing methods are as follows:

[0063] 1. Curing method: light curing, wavelength: 365nm, curing energy: 5000 mJ / cm 2 .

[0064] 2. Viscosity test: The viscosity of the prepared liquid glue was tested using a Brookfield LV, using a No. 21 rotor at room temperature (25°C), a speed of 10 RPM, and a test time of 3 min.

[0065] 3. Refractive index test:

[0066] ① Liquid refractive index: Use ATAGO Abbe refractometer NAR 4T to measure the refractive index of liquid optical adhesive;

[0067] ② Solid refractive index: The glue was photocured to prepare a 2 mm thick block, and the refractive index of the block was measured using an ATAGO Abbe refractometer NAR 4T.

[0068] 4. Transmittance: Prepare the adhesive layer into a film of approximately 400 μm. Use a UV-3600i Plus spectrophotometer at a medium scan speed, a data interval of 1 nm, and a wavelength range of 380 nm to 1100 nm. Record the transmittance at 500 nm.

[0069] The non-adhesive surface is non-reflective and has optical shielding properties. Sample preparation method: The optical adhesive of the embodiment and the comparative example prepared by the present invention are respectively coated on a smooth glass sheet, and the thickness of the adhesive layer is controlled to be 400 μm;

[0070] Preparation method of adhesive / non-adhesive surface optical obscuration sample:

[0071] (1) Preparation method of bonding surface sample: Fill the optical adhesive prepared by the present invention between two pieces of glass, and control the thickness of the adhesive layer to 400 μm;

[0072] (2) Non-adhesive surface sample preparation method: The optical adhesive prepared by the present invention is applied on a glass sheet, and the thickness of the adhesive layer is controlled to be 400 μm;

[0073] Formula viscosity range - comparison between comparative example and example

[0074] Comparison of Examples 1-3 demonstrates that the overall viscosity of a low-viscosity adhesive composition with anisotropic light transmittance can be adjusted in two ways. Method 1 adjusts the overall viscosity of the adhesive by varying the ratio of a resin with specific optical properties to a diluent monomer. Method 2 further reduces the overall viscosity of the adhesive by adding diluent monomers with varying dilution capacities. These two methods can produce a low-viscosity, light-curing adhesive for glass seam splicing with anisotropic light transmittance. This adhesive is suitable for capillary diffusion processes for splicing micro-gap gaps in optical glass, such as those used in optical glass and displays, effectively preventing the generation of bubbles during the manufacturing process.

[0075] Comparison of the use of different resins - comparative examples and examples

[0076] A comparison of Examples 1-3 and Examples 7-8 demonstrates that low-viscosity optical adhesives can be prepared using different acrylate resins, epoxy resins, or mixed combinations of resins containing both acrylate and epoxy groups. In particular, in Example 8, the primary resin is a resin containing both acrylate and epoxy groups, and the low-viscosity diluent can be either an acrylic diluent or an epoxy diluent, or even a mixture of both. These resin compositions, when meeting the conditions specified in this technology announcement, including the addition of black powder and micron-sized fillers of a specific particle size, can produce low-viscosity, light-curing adhesives for glass joints with a refractive index of 1.5 or greater at room temperature (25°C), a certain light transmittance on the bonding surface, and light-shielding and non-reflective properties on the non-bonding surface. Therefore, the formulation system of this technology can meet the diverse needs of different customers within a specific performance range.

[0077] Comparison of different transmittance formulas - comparative examples and examples

[0078] From the comparison of Examples 3 to 6, it can be seen that by changing the amount of black filler added to the glue, liquid optical adhesives with different transmittances in the visible light range can be prepared, and the light transmittance between the bonding surfaces can be controlled between 5% and 90%.

[0079] Non-adhesive surface after curing colloid surface - comparative example and embodiment comparison description:

[0080] Figure 2 Compare the surface conditions of the following three samples after curing on the non-bonding surface. The three samples are:

[0081] (1) Comparative Example 2 (only black filler added),

[0082] (2) Comparative Example 3 (adding black filler, powder not within the particle size range declared in the present invention),

[0083] (3) Example 6 (addition of black filler and micron powder within the particle size range declared in this patent).

[0084] Three adhesive formulations were prepared according to the (non-adhesive surface non-reflective, optically obscuring sample preparation method) and then visually observed for reflectivity under standard fluorescent light. Comparative Examples 2 and 3 exhibited significant reflectivity on the non-adhesive surface under standard fluorescent light, while Example 6 exhibited no reflectivity at all. Further explanation: despite the addition of an inorganic powder with a particle size of 0.4μm in Comparative Example 3, the non-adhesive surface still exhibited reflectivity under fluorescent light. In practical applications, this reflectivity can cause streaking issues across the entire display module. However, the addition of black filler and the specific 5μm-50μm micron-sized powder disclosed in this patent to the Example 6 formulation eliminated any reflectivity on the non-adhesive surface under fluorescent light, effectively preventing streaking issues caused by reflections in display modules during practical applications.

[0085] Comparative Example 2 Comparative Example 3 Example 6 Weight percentage of black filler 0.5 0.5 0.5 The weight percentage of micron-sized powder (5um~50um) within the scope of this patent declaration 0 0 5 Weight percentage of micron particle size powder (0.4um) 0 5 0

[0086] Table 1: specific material weight parts table of Comparative Example 2, Comparative Example 2 and Example 6;

[0087] Light transmittance in different directions between the bonding surface and the non-bonding surface - comparison between the comparative example and the embodiment:

[0088] Figure 3 Compare the light transmittance of the following three samples in different directions on the bonding surface and non-bonding surface. The three samples are:

[0089] (1) Comparative Example 2 (only black filler added),

[0090] (2) Comparative Example 3 (adding black filler, powder not within the particle size range declared in the present invention),

[0091] (3) Example 6 (addition of black filler and micron powder within the particle size range declared in this patent).

[0092] The bottom of the image shows the printed text for the adhesive and non-adhesive surfaces. The three samples in the upper half are made using the adhesive surface sample preparation method for Comparative Examples 2, 3, and Example 6. The three samples in the lower half are made using the non-adhesive surface sample preparation method for Comparative Examples 2, 3, and Example 6.

[0093] In the formula of Comparative Example 2, only black filler is added, and both the bonding surface and the non-bonding surface have a certain transmittance, that is, the bottom plate text can be clearly displayed under strong light.

[0094] Comparative Example 3, which incorporates black filler and other inorganic powders (whose particle size falls outside the range specified in this patent), still reveals the base text on both the adhesive and non-adhesive surfaces under strong light. This means both the adhesive and non-adhesive surfaces have a certain transmittance, failing to meet the requirement for different light transmittances in different directions as required by the present invention. In practical applications, the adhesive surface must have a certain transmittance (5% to 90%), while the non-adhesive surface must be completely light-shielding.

[0095] After adding black filler and the specific micron-sized powder with a particle size of 5μm~50μm declared in the present invention, Example 6 can achieve a specific transmittance on the bonding surface, and the non-bonding surface has a light-shielding property (the text on the bottom plate is covered and cannot be clearly displayed). Its performance can meet the application requirements of glass splicing glue in display modules.

[0096] In general, a comparison of Examples 5-6 with Comparative Examples 1-3 shows that while the glues in Comparative Examples 1-2 achieve a certain degree of light-shielding properties by adding a certain amount of black filler, i.e., increasing the black filler content reduces light transmittance, they fail to achieve the desired properties of anisotropic light transmission as claimed in this patent: a certain degree of transmittance on the bonding surface, while the non-bonding surface exhibits light-shielding and non-reflective properties. Even though Comparative Example 3 contains black filler and micron-sized powder, the added powder particle size falls outside the claimed range, and the non-bonding surface still exhibits a certain degree of light transmittance and light reflectivity, thus failing to achieve anisotropic light transmission. To address this issue, the present invention utilizes the synergistic effect of black filler and micron-sized powder (with a powder diameter between 5μm and 50μm) to produce a low-viscosity glue composition with anisotropic light transmission. This glue composition achieves the integrated functions of light transmission on the bonding surface and light-shielding and non-reflective properties on the non-bonding surface, effectively alleviating the side light leakage and reflection issues of optical devices and simplifying the optical device manufacturing process compared to the prior art.

[0097] In summary, the present invention prepares a low-viscosity glue composition with anisotropic light transmittance, as well as its preparation method and application. The anisotropic light transmittance described in the present invention means that the bonding surface has a certain transmittance, while the non-bonding surface has light-shielding and non-reflective properties. Its composition is calculated by weight as follows: 50 to 95 parts by weight of a resin with a certain optical refractive index, 0.1 to 10 parts by weight of a photoinitiator, 0.001 to 10 parts by weight of a black filler, 0.01 to 20 parts by weight of a micron-sized powder (powder diameter is between 5μm and 50μm), and 0.01 to 10 parts by weight of other functional additives, which include a defoaming agent, an antioxidant, and an adhesion promoter.

[0098] The glue of the present invention has the following application characteristics:

[0099] Low viscosity avoids bubbles during application and is suitable for capillary diffusion processes in micro-gap splicing of optical glass, displays, etc.

[0100] The colloid itself has a certain optical shielding property, which can control the light transmittance of the bonding surface of the two spliced ​​glass panels;

[0101] Since the non-bonding surface of conventional optical glue on the market is exposed to the air during the application process, the spliced ​​part of the glue will cause light transmission and reflection, resulting in the problem of splicing stripes on the entire display module. The glue of the present invention can form a special surface structure on the non-bonding surface, avoiding reflection and light leakage on the surface of the glue, and reducing the obvious visual stripe phenomenon caused by the splicing slit glue on the overall optical display system.

[0102] Components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Comparative Example 1 Comparative Example 2 Comparative Example 3 CN104 NS 60 40 40 40 40 40 40 40 40 SEA-H187AI 50 MIRAMER M140 40 60 GM61P00 60 60 60 60 50 60 60 60 CELLOXIDE 2021P 70 ED-509S 30 RAVEN 3500 0.01 0.01 0.01 0.05 0.2 0.5 0.2 0.2 0.2 0.5 0.5 OK412 (particle size 6μm) 5 5 5 5 5 5 5 5 SFP-20M (particle size: 0.4 μm) 5 TR-TPO-L 2 2 2 2 2 2 1 2 2 2 TR-PAG-202 2 1 KH-570 2 2 2 2 2 2 2 2 2 2 KH-560 2 BYK-0653 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1010 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Viscosity cps 1500 600 200 200 200 200 50 300 200 200 200 Liquid refractive index 1.54 1.53 1.5 1.51 1.51 1.51 1.5 1.51 1.51 1.51 1.51 Refractive index of solids 1.56 1.55 1.52 1.53 1.53 1.53 1.52 1.53 1.53 1.53 1.53 Light transmittance of bonding surface 90 90 90 73 45 15 45 45 16 14 12

[0103] Table 2: Component ratios and test results of Examples 1 to 8 and Comparative Examples 1 to 3

[0104] In summary, the low-viscosity optical glue has the following application characteristics: (1) low viscosity, which avoids the generation of bubbles during the application process and is suitable for capillary diffusion processes of micro-gap splicing of optical glass, displays, etc.; (2) the colloid itself has a certain optical shielding property and can control the light transmittance of the bonding surface of the two spliced ​​glass; (3) since the non-bonding surface of the conventional optical glue on the market will be exposed to the air during the application process, the spliced ​​part of the colloid will cause the entire display module to have splicing stripes due to light transmission and reflection, while the glue of the present invention can form a special surface structure on the non-bonding surface, avoiding reflection, light leakage and other phenomena on the surface of the colloid, and reducing the obvious visual stripe phenomenon of the splicing slit glue on the overall optical display system.

[0105] The optical adhesive prepared by the present invention maintains a refractive index of 1.50 or above within the visible light range (589 nm), and maintains a viscosity between 5 cps and 2000 cps at room temperature (25°C). By varying the amount of black filler used, the colloid's ability to absorb wavelengths in the visible light band is adjusted, thereby controlling the colloid's light-shielding properties. Furthermore, the use of micronized powders of a specific particle size creates a unique surface structure on the surface of the colloid exposed to air during light curing, thereby reducing light reflection on the non-bonded surface and thereby minimizing or even eliminating noticeable visual streaks caused by reflected light. The optical adhesive of the present invention integrates light transmittance on the bonded surface and light shielding on the non-bonded surface, simplifying the preparation process during optical glass seam splicing.

[0106] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-viscosity glue composition with different light transmittance, characterized in that: The composition comprises the following components in parts by weight: 50-90 parts of organic resin, 0.1-10 parts of photoinitiator, 0.001-10 parts of black filler, 0.01-20 parts of micron-sized powder with a diameter of 5 μm-50 μm, and 0.01-10 parts of other functional additives; The other functional additives include at least one of a defoaming agent, an antioxidant and an adhesion promoter; The organic resin has an acrylate group or an epoxy group, which makes the final glue composition reactive and capable of undergoing a light-curing reaction. After uniform mixing, the glue composition has an optical refractive index of greater than 1.5 at room temperature and a room temperature viscosity of 5 cps to 2000 cps.

2. The low-viscosity glue composition with different light transmittance according to claim 1, characterized in that: The organic resin is at least one of acrylate oligomer, acrylate monomer and epoxy resin.

3. The low-viscosity glue composition with different light transmittance according to claim 1, characterized in that: The photoinitiator is at least one of α-hydroxy ketone photoinitiators, benzoin compounds, acylphosphine oxide photoinitiators, acetophenone photoinitiators, acetophenone photoinitiators, morpholinyl ketone photoinitiators, diphenyl hexafluoroantimonate iodonium salts, diphenyl hexafluoroarsenate iodonium salts, diphenyl hexafluorophosphate iodonium salts, fluoroborate iodonium salts, aryl diazonium salts, and threonium ferrocene.

4. The anisotropically transparent low-viscosity glue composition according to claim 1, characterized in that: The filler is at least one of carbon black, black iron oxide, and silicon aluminum carbon black.

5. The low-viscosity glue composition with different light transmittance according to claim 1, characterized in that: The micron-sized powder is at least one of silicon dioxide, kaolin, talc, diatomaceous earth, low-molecular thermoplastic resin, and silicone resin.

6. The low-viscosity glue composition with different light transmittance according to claim 1, characterized in that: The antioxidant is at least one of hindered phenols, hindered amines and phosphate antioxidants.

7. The low-viscosity glue composition with different direction transmittance according to claim 1, characterized in that: The adhesion promoter is a silane coupling agent.

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