CN114574151A - Liquid optical cement for ink jet - Google Patents

Liquid optical cement for ink jet Download PDF

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Publication number
CN114574151A
CN114574151A CN202210364778.5A CN202210364778A CN114574151A CN 114574151 A CN114574151 A CN 114574151A CN 202210364778 A CN202210364778 A CN 202210364778A CN 114574151 A CN114574151 A CN 114574151A
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China
Prior art keywords
liquid optical
acrylate
optical cement
hydroxyl
inkjet according
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CN202210364778.5A
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Chinese (zh)
Inventor
张仲
王耀宇
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Interface Optoelectronics Shenzhen Co Ltd
Interface Technology Chengdu Co Ltd
Yecheng Optoelectronics Wuxi Co Ltd
General Interface Solution Ltd
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Interface Optoelectronics Shenzhen Co Ltd
Interface Technology Chengdu Co Ltd
Yecheng Optoelectronics Wuxi Co Ltd
General Interface Solution Ltd
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Application filed by Interface Optoelectronics Shenzhen Co Ltd, Interface Technology Chengdu Co Ltd, Yecheng Optoelectronics Wuxi Co Ltd, General Interface Solution Ltd filed Critical Interface Optoelectronics Shenzhen Co Ltd
Priority to CN202210364778.5A priority Critical patent/CN114574151A/en
Priority to TW111113786A priority patent/TWI807773B/en
Publication of CN114574151A publication Critical patent/CN114574151A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04Polyurethanes
    • C09J175/14Polyurethanes having carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/62Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6204Polymers of olefins
    • C08G18/6208Hydrogenated polymers of conjugated dienes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/67Unsaturated compounds having active hydrogen
    • C08G18/671Unsaturated compounds having only one group containing active hydrogen
    • C08G18/672Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/67Unsaturated compounds having active hydrogen
    • C08G18/69Polymers of conjugated dienes
    • C08G18/698Mixtures with compounds of group C08G18/40
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/74Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Ink Jet (AREA)
  • Materials For Medical Uses (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

The invention provides a liquid optical adhesive for ink jet, which comprises 5-30 wt% of polyurethane modified acrylate prepolymer; 65-90 wt% of an acrylate reactive diluent; 0.2 to 2% by weight of a photoinitiator; 0.01 to 0.1% by weight of a polymerization inhibitor; 0.5 to 1 wt% of a light stabilizer; 0.1-3 wt% of an antioxidant; 0 to 0.5 wt% of a coupling agent; and 0.01 to 1 wt% of an additive. The liquid optical adhesive for ink jet has excellent humidity resistance, heat resistance and storage stability, is not easy to generate bubbles and age and yellow, has high light transmittance and bonding strength, and has excellent optical performance and stress reaction cracking resistance, thereby meeting the requirements of ink jet printing processes.

Description

Liquid optical cement for ink jet
Technical Field
The present invention relates to a liquid optical adhesive, and more particularly to a liquid optical adhesive for ink jet.
Background
Liquid optical cement has wide application in the field of glue dispensing and laminating of various electronic products, and is commonly used for laminating display modules such as smart phones, flat panels, watches, bracelets and the like. Therefore, the liquid optical cement is required to have excellent optical properties and good resistance to various hot and humid environments during the use of the product.
The conventional liquid optical cement has high viscosity, generally adopts the processes of scraping glue, slit gluing, glue pouring and the like to carry out glue dispensing, has poor thickness uniformity of a glue layer, and is easy to generate bubbles. The ink-jet printing process has the advantages that the glue layer is coated uniformly, the problem of bubbles can be improved to a certain extent, meanwhile, no retaining wall is needed in the dispensing process, the process can be flexibly adjusted according to actual conditions, and the ink-jet printing process is widely applied to the full-lamination field of VR glasses and the like.
Liquid optical adhesives for ink jet are classified into acrylic and silicone, but are generally not resistant to moist heat, and are likely to suffer from problems such as yellowing and whitening of adhesive layers, edge bubbles, and warping in high-temperature and high-humidity environments. In order to solve the problems, the current acrylic liquid optical adhesive for ink jet avoids the generation of bubbles by increasing the elastic modulus and simultaneously reducing the viscosity, but has lower light transmittance and lower molecular weight of the used modified polyurethane resin, so that the adhesive force is lower, and the application display effect and the product use are influenced. In addition, the silicone liquid optical cement can improve the bubble discharge performance while reducing the viscosity by adding a viscosity regulator and a construction aid, but the refractive index is generally lower.
Therefore, how to improve the formulation of the liquid optical adhesive for ink-jet to solve the above-mentioned deficiencies of the prior art is a task that those skilled in the art are eagerly to research and develop.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a liquid optical adhesive for inkjet printing, which not only has excellent humidity and heat resistance and storage stability, but also has excellent light transmittance and adhesive strength, and can meet the requirements of inkjet printing process.
In order to achieve the above object, the present invention provides a liquid optical adhesive for ink-jet printing, which comprises the following components:
5-30 wt% of a urethane-modified acrylate prepolymer;
65-90 wt% of an acrylate reactive diluent;
0.2 to 2% by weight of a photoinitiator;
0.01 to 0.1% by weight of a polymerization inhibitor;
0.5 to 1 wt% of a light stabilizer;
0.1-3 wt% of an antioxidant;
0 to 0.5 wt% of a coupling agent; and
0.01 to 1 wt% of an additive.
According to an embodiment of the present invention, the urethane-modified acrylate prepolymer is formed by polymerizing diisocyanate and hydroxyl-containing organic compound.
According to the embodiment of the present invention, the molar ratio of the isocyanate group to the hydroxyl group in the urethane-modified acrylate prepolymer is 1.1 to 1.5.
According to an embodiment of the present invention, the aforementioned diisocyanate is selected from one or more of isophorone diisocyanate (IPDI), m-xylylene isocyanate (XDI), Toluene Diisocyanate (TDI), 1, 5-Naphthalene Diisocyanate (NDI), and Hexamethylene Diisocyanate (HDI).
According to an embodiment of the present invention, the hydroxyl group-containing organic material includes a hydroxyl acrylate resin and a polybutadiene polyol.
According to an embodiment of the present invention, the hydroxyl group-containing organic material includes 60 to 85 wt% of a hydroxyl acrylate resin and 15 to 40 wt% of a polybutadiene polyol, based on the total amount of the hydroxyl group-containing organic material.
According to an embodiment of the present invention, the hydroxy acrylate resin is selected from one or more of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hydroxypropyl acrylate (HPA), hydroxypropyl methacrylate (HPMA), hydroxybutyl acrylate (4HBA) and hydroxybutyl methacrylate (4 HBMA); the polybutadiene polyol is one or more selected from hydrogenated polybutadiene polyol, hydroxyl-terminated polybutadiene and hydrogenated hydroxyl-terminated polybutadiene.
According to an embodiment of the invention, the aforementioned acrylate reactive diluent is selected from a mixture of at least two of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), Lauryl Acrylate (LA), hydroxybutyl acrylate (4HBA), tetrahydrofurfuryl acrylate (THFA) and tetrahydrofurfuryl methacrylate (THFMA).
According to an embodiment of the present invention, the aforementioned photoinitiator is selected from one or more of 2-hydroxy-2-methylphenylacetone, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide, diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide and 1-hydroxycyclohexylphenylketone.
According to an embodiment of the present invention, the polymerization inhibitor is p-hydroxyanisole (MEHQ).
According to an embodiment of the present invention, the light stabilizer is bis (1,2,2,6, 6-pentamethyl-4-piperidinyl) sebacate.
According to an embodiment of the present invention, the antioxidant is one or more of 2, 6-di-tert-butyl-4-methylphenol, didodecyl thiodipropionate, and the like.
According to an embodiment of the present invention, the coupling agent is 3- (2, 3-glycidoxy) propyltrimethoxysilane.
According to an embodiment of the present invention, the aforementioned additive is one or more of a defoaming agent and a surfactant.
According to an embodiment of the present invention, the defoaming agent is polydimethylsiloxane.
According to an embodiment of the present invention, the viscosity of the liquid optical adhesive for ink jet printing is 0 to 50 mPas.
Compared with the prior art, the invention has the following advantages:
1. the liquid optical cement for ink jet provided by the invention has low viscosity and is suitable for ink jet printing.
2. The liquid optical cement for ink jet provided by the invention has high light transmittance and bonding strength, and excellent optical performance and stress reaction and splitting resistance.
3. The liquid optical adhesive for ink jet provided by the invention has excellent humidity and heat resistance and storage stability.
The purpose, technical content, features and effects of the present invention will be more readily understood through the detailed description of the embodiments below.
Drawings
Fig. 1 is a schematic structural diagram of a liquid optical adhesive for inkjet according to an embodiment of the present invention.
Fig. 2 is a schematic view of a bonding structure of the liquid optical adhesive for inkjet used in a touch display device provided in the present invention.
The reference signs are:
liquid optical adhesive for inkjet 14
Outer protective glass for display panel 16
Detailed Description
The following detailed description of the present invention will be provided in conjunction with specific examples to assist those skilled in the art in further understanding the present invention.
The technical solutions adopted in the embodiments of the present invention are only examples, and should not be used to limit the present invention unless specifically stated. The embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Unless otherwise indicated, all numerical range values set forth herein are intended to include the endpoints of the range, and all integers and fractions within the range. Percentages, ratios, etc. listed herein are by weight unless otherwise specified.
The invention provides a liquid optical adhesive for ink jet, which takes polyurethane modified acrylate prepolymer as main resin, controls the molecular weight by hydroxyl acrylate resin, and properly improves the molecular weight of the prepolymer by polybutadiene polyol to ensure that the optical adhesive has certain adhesive force; meanwhile, the acrylate reactive diluent is matched to reduce the viscosity of the system and improve the performances of water resistance, temperature resistance and the like; in addition, the addition of a photoinitiator can initiate polymerization of the system. The storage stability can be improved by adding the polymerization inhibitor; the addition of light stabilizer and antioxidant can improve light stability and inhibit aging degradation; the addition of the coupling agent can increase the crosslinking degree of the system and improve the adhesive force; and additives such as defoaming agent, surfactant and the like are added to ensure other performances such as appearance, film forming property and the like of the optical cement.
Fig. 1 is a schematic structural diagram of a liquid optical adhesive for inkjet according to an embodiment of the present invention. The formula of the liquid optical adhesive for ink-jet provided by the embodiment specifically comprises the following components: 5-30 wt% of a polyurethane-modified acrylate prepolymer; 65-90 wt% of an acrylate reactive diluent; 0.2 to 2% by weight of a photoinitiator; 0.01 to 0.1% by weight of a polymerization inhibitor; 0.5 to 1 wt% of a light stabilizer; 0.1-3 wt% of an antioxidant; 0 to 0.5 wt% of a coupling agent; and 0.01 to 1 wt% of an additive.
Further, the polyurethane modified acrylate prepolymer used in the present invention can combine the excellent properties of polyurethane and acrylate resin. Because the polyurethane modified acrylate prepolymer is used as the main resin, the system has excellent chemical resistance, water resistance, weather resistance and film forming property, meanwhile, groups such as carbon-carbon double bonds in molecules are very easy to react to form a crosslinking network after modification, intermolecular force is also improved due to the existence of hard segment hydrogen bonds in polyurethane, and the optical adhesive has higher elastic modulus and crosslinking density.
The polyurethane modified acrylate prepolymer used in the invention is obtained by polymerizing diisocyanate and hydroxyl-containing organic matters. In the urethane-modified acrylate prepolymer of the present invention, the ratio of diisocyanate to the hydroxyl-containing organic substance is different depending on the content of the isocyanate group and the hydroxyl group contained in each of the diisocyanate and the hydroxyl group, and generally, the molar ratio of the isocyanate group to the hydroxyl group in the urethane-modified acrylate prepolymer is 1.1 to 1.5. Among them, suitable diisocyanates for use in the present invention may include, but are not limited to: one or more of isophorone diisocyanate (IPDI), m-xylylene isocyanate (XDI), Toluene Diisocyanate (TDI), 1, 5-Naphthalene Diisocyanate (NDI), and Hexamethylene Diisocyanate (HDI). The hydroxyl-containing organic substance used in the present invention includes a combination of a hydroxyl acrylate resin and a polybutadiene polyol; specifically, the hydroxyl group-containing organic substance includes 60 to 85 wt% of a hydroxyl acrylate resin and 15 to 40 wt% of a polybutadiene polyol, based on the total amount of the hydroxyl group-containing organic substance. Among them, the hydroxy acrylate resins suitable for use in the present invention may include, but are not limited to: one or more of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hydroxypropyl acrylate (HPA), hydroxypropyl methacrylate (HPMA), hydroxybutyl acrylate (4HBA) and hydroxybutyl methacrylate (4 HBMA). Polybutadiene polyols suitable for use in the present invention may include, but are not limited to: one or more of hydrogenated polybutadiene polyol, hydroxyl-terminated polybutadiene, and hydrogenated hydroxyl-terminated polybutadiene.
Further, in the acrylate reactive diluent used in the present invention, the hydrophobic acrylate group and the tight cross-linked network can hinder the penetration of water molecules, so that the water resistance of the liquid optical cement is significantly improved. Considering that too high hardness of the optical cement after curing may be relatively easy to cause stress cracking, the acrylate reactive diluents suitable for the present invention may include, but are not limited to: a mixture of at least two of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), Lauryl Acrylate (LA), hydroxybutyl acrylate (4HBA), tetrahydrofurfuryl acrylate (THFA), and tetrahydrofurfuryl methacrylate (THFMA). Taking an acrylate reactive diluent formed by mixing four materials as an example, the acrylate reactive diluent can comprise 15-40 wt% of isobornyl acrylate, 10-40 wt% of lauryl acrylate, 10-20 wt% of tetrahydrofurfuryl methacrylate and 5-10 wt% of hydroxybutyl acrylate based on the total weight of the liquid optical adhesive for ink jet. Of course, the acrylate reactive diluent can also be formed by mixing two, three, five or six materials.
Further illustrated, photoinitiators suitable for use in the present invention may include, but are not limited to: one or more of 2-hydroxy-2-methylphenylacetone, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide, diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide, and 1-hydroxycyclohexylphenylketone. The polymerization inhibitor suitable for use in the present invention may be, for example, p-hydroxyanisole (MEHQ). Light stabilizers suitable for use in the present invention may be, for example, bis (1,2,2,6, 6-pentamethyl-4-piperidinyl) sebacate. Antioxidants suitable for use in the present invention may be, for example, 2, 6-di-tert-butyl-4-methylphenol. A coupling agent suitable for use in the present invention may be, for example, 3- (2, 3-glycidoxy) propyltrimethoxysilane. Additives suitable for use in the present invention may be, for example, one or more of a defoamer and a surfactant, for example, the defoamer may be polydimethylsiloxane. The above listed materials are only examples and are not limited to practice.
It should be noted that the content of the coupling agent used in the present invention may be 0% by weight, which means that the coupling agent may not be included in the formulation of the liquid optical adhesive for inkjet according to the present invention.
The liquid optical adhesive for ink-jet printing has lower viscosity by adopting the formula, the viscosity of the liquid optical adhesive for ink-jet printing is in the range of millipascal-second (mPa & s), the liquid optical adhesive is suitable for ink-jet printing, and has excellent humidity and heat resistance and storage stability, bubbles are not easy to generate, aging and yellowing are not easy to occur, and the comprehensive performance of the liquid optical adhesive is improved.
The present invention will be described in further detail and the effects thereof will be verified by referring to the following specific examples and comparative examples, which should not be construed as limiting the scope of the present invention, and the test methods and standards for verifying the same are as follows:
a commercially available liquid optical adhesive for acrylic inkjet was used as comparative example 1. The specific compositions of the liquid optical adhesives for ink-jet of examples 1 to 3 provided by the present invention are shown in the table I, wherein the percentages in the table are by weight.
Watch 1
Composition of matter Example 1 Example 2 Example 3
Urethane modified acrylate prepolymer 23% 30% 29%
Acrylic acid isobornyl ester 20% 31.5% 37.5%
Isobornyl methacrylate 5% - -
Acrylic acid lauryl ester 30% 15% 30
Tetrahydrofurfuryl methacrylate
14% 10% -
Acrylic acid hydroxy butyl ester 5.5% 10% -
Photoinitiator 1.0% 0.5% 1.2%
Polymerization inhibitor 0.03% 0.05% 0.1%
Light stabilizers 0.8% 0.5% 0.8%
Antioxidant agent 0.1% 1.0% 0.5%
Coupling agent 0.02% 0.45% 0.5%
Additive agent 0.55% 1.0% 0.4%
Specific compositions of the synthetic formulations of the urethane-modified acrylate prepolymers of examples 1 to 3 are shown in table two, in which the percentages are by weight.
Watch two
Figure BDA0003586609440000061
The remaining components of the liquid optical cement for inkjet of examples 1 to 3 are shown below:
photoinitiator (2):
example 1: 2-hydroxy-2-methylphenylacetone, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide
Example 2: 2-hydroxy-2-methylphenylacetone, diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide
Example 3: diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide or 1-hydroxycyclohexylphenylketone.
Polymerization inhibitor: p-hydroxyanisole.
Light stabilizer: sebacic acid bis (1,2,2,6, 6-pentamethyl-4-piperidinyl) ester.
Antioxidant: 2, 6-di-tert-butyl-4-methylphenol.
Coupling agent: 3- (2, 3-glycidoxy) propyltrimethoxysilane.
Additive: polydimethylsiloxane (defoamer).
And (3) performance testing:
first, viscosity test (according to ASTM D4287 and 2000 specifications): the viscosity of the optical cement was measured under high shear conditions (shear strain rate 1200s-1) using a cone-plate viscometer, and the results were expressed in millipascal-seconds (mPa · s). The viscosity of the liquid optical adhesive for ink jet is usually required to be 0 to 50 mPas.
Second, refractive index test (according to ISO 489 specification): after the optical cement was cured, the refractive index thereof was measured using an abbe refractometer. The refractive index of the liquid optical cement is about 1.50, which is acceptable.
Thirdly, light transmittance test (according to ISO 13468-1 standard): the optical cement is prepared into a thin layer with a smooth surface and is cured, the luminous flux penetrating through the sample and the luminous flux irradiating on the sample are measured, and the ratio of the luminous flux penetrating through the sample to the luminous flux irradiating on the sample is the light transmittance which is expressed by percentage. The higher the light transmittance of the liquid optical cement is, the clearer the picture of the product is.
Fourth, haze test (according to ASTM D1003 specification): preparing the optical cement into a thin layer with a flat surface, curing the thin layer, measuring the scattered luminous flux and the transmitted luminous flux which deviate from the incident light direction after the optical cement penetrates through the sample, wherein the ratio of the scattered luminous flux to the transmitted luminous flux is the haze and is expressed by percentage. The haze of the liquid optical cement is smaller, and the picture color is clearer on products such as an optical module and the like.
Fifth, yellowness index YI test (according to ASTM E313 specification): preparing the optical adhesive into a flat film, curing the flat film, testing the stimulus values corresponding to the three primary colors of red, green and blue by using a color difference meter, and calculating the yellow index of the optical adhesive. Generally, the YI of the liquid optical cement is required to be less than 1, and the closer to 0, the better the color of the product picture.
Sixthly, testing the bonding strength (according to ISO 4587 specification): preparing a single lap joint sample, applying longitudinal tensile shearing force on the lap joint surface of the sample after completely curing the optical cement, and testing the maximum load which can be borne by the sample, namely the bonding strength. The higher the bond strength, the less likely the optical cement will exhibit stress reaction cracking.
Seventhly, density test (according to ASTM D792 specification): the mass per unit volume of the optical cement, i.e. the density, was measured at 23 ℃ and the results were in g/ml. The smaller the density, the more the number of optical glue points with the same quality is, and the lower the cost is.
Eighthly, pH test: the optical cement pH was tested with a pH meter. 6 to 7 hours is neutral, and basically has no corrosion to product electrodes and the like, and the result is good.
Ninthly, testing moisture and heat resistance:
1. coating the liquid optical cement on a substrate, curing, testing for 1000 hours in a 65 ℃ and 90% RH oven, and taking out to detect the appearance, the light transmittance, the haze and other properties of the liquid optical cement;
2. after the liquid optical cement coated on the substrate is cured, the substrate is placed in an oven at 85 ℃ and 85% RH for testing for 1000 hours, and then the substrate is taken out for testing the appearance, the light transmittance, the haze and other properties of the substrate.
And (3) testing results:
table III shows the performance test results of the liquid optical adhesive for ink-jet of examples 1-3 of the present invention and the general liquid optical adhesive for ink-jet of comparative example 1. The results show that the general liquid optical adhesive for ink-jet of comparative example 1 has the properties within the specification range of the liquid optical adhesive for ink-jet except that the light transmittance is low, and the refractive index is relatively ideal 1.49; the pH is 7.6, the paint is weakly alkaline and has weak corrosivity; the yellowness index was 0.50, slightly better than example 1. The liquid optical adhesive for ink jet of the embodiment 1 has excellent light transmittance and bonding strength, so that a picture can be clearer in the using process of a product, a glue layer is not prone to stress reaction and splitting, other properties can meet the requirements of the liquid optical adhesive for ink jet, and the comprehensive performance is better. The liquid optical cement for ink-jet of the embodiment 2 has a low yellow index of 0.28, so that the material has high light transmittance, and the comprehensive performance of the liquid optical cement is superior to that of the comparative example 1. In addition to higher viscosity and yellow index, the liquid optical cement for ink-jet of example 3 also has better combination properties than those of comparative example 1.
Watch III
Figure BDA0003586609440000071
Figure BDA0003586609440000081
The fourth table shows the reliability test results of the liquid optical adhesive for ink-jet of examples 1 to 3 of the present invention and the general liquid optical adhesive for ink-jet of comparative example 1. The results show that the general liquid optical adhesive for inkjet of comparative example 1 has a certain degree of yellowing in appearance after the high temperature and high humidity resistance test, edge bubbles after the 85 ℃/85% RH test, and a significant increase in haze, indicating poor wet heat resistance. The liquid optical adhesives for ink-jet of examples 1 to 3 had little change in appearance, haze and the like under high-temperature and high-humidity environment, and had no decrease in light transmittance. It can be seen that the liquid optical adhesive for inkjet of examples 1 to 3 provided by the present invention has more excellent wet heat resistance than the general liquid optical adhesive for inkjet of comparative example 1. Meanwhile, after the optical cement is stored for 1000 hours at room temperature after being cured, the general liquid optical cement for inkjet of the comparative example 1 is slightly whitened, while the liquid optical cement for inkjet of the examples 1 to 3 is not obviously abnormal, which indicates that the storage stability is better.
Watch four
Figure BDA0003586609440000082
The test results show that the liquid optical adhesive for ink-jet of 1-3 of the invention has low viscosity, is suitable for ink-jet printing process, has high refractive index (about 1.50), high light transmittance (99%), high bonding strength (above 4.5 MPa), good humidity and heat resistance effect, no bubble, no yellowing of adhesive layer, no whitening and other defects after reliability test, and can fully meet the requirements of ink-jet printing process.
The liquid optical adhesive for inkjet of the present invention is suitable for coating on substrates including glass, PMMA, COC, etc., but not limited thereto, and as is well known to those skilled in the art, can be applied to the field of adhesive dispensing and bonding of optical electronic products such as mobile phones, tablet computers, wearable display modules, etc. to bond and fix two optical components together. Taking the application of the touch display device as an example, as shown in fig. 2, the liquid optical adhesive 10 for inkjet of the present invention can be applied between the display panel 12 and the touch panel 14 and between the touch panel 14 and the outer protective glass 16 by an inkjet printing process, so that the display panel 12 and the touch panel 14 are attached to each other, and the touch panel 14 and the outer protective glass 16 are attached to each other.
In summary, the liquid optical adhesive for inkjet according to the present invention has low viscosity and is suitable for use in inkjet printing process, and has excellent humidity resistance and heat resistance and storage stability, can effectively avoid the occurrence of yellowing and whitening of adhesive layer, and edge bubbles and warpage in high temperature and high humidity environment, and has high light transmittance and adhesive strength, and can exhibit excellent optical performance and stress reaction cracking resistance, thereby achieving good bonding display effect, and improving product quality and reliability, thereby improving market competitiveness.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications according to the features and the spirit described in the scope of the application of the present invention should be included in the scope of the application of the present invention.

Claims (16)

1. The liquid optical cement for ink-jet is characterized by comprising the following components:
5-30 wt% of a polyurethane-modified acrylate prepolymer;
65-90 wt% of an acrylate reactive diluent;
0.2 to 2% by weight of a photoinitiator;
0.01 to 0.1% by weight of a polymerization inhibitor;
0.5 to 1 wt% of a light stabilizer;
0.1-3 wt% of an antioxidant;
0 to 0.5 wt% of a coupling agent; and
0.01 to 1 wt% of an additive.
2. The liquid optical cement for inkjet according to claim 1, wherein the urethane-modified acrylate prepolymer is formed by polymerizing diisocyanate and hydroxyl-containing organic substance.
3. The liquid optical cement for inkjet according to claim 2, wherein the molar ratio of isocyanate group to hydroxyl group in the urethane-modified acrylate prepolymer is 1.1 to 1.5.
4. The liquid optical cement for inkjet according to claim 2, wherein the diisocyanate is one or more selected from the group consisting of isophorone diisocyanate, m-xylylene isocyanate, toluene diisocyanate, 1, 5-naphthalene diisocyanate and hexamethylene diisocyanate.
5. The liquid optical cement for inkjet according to claim 2, wherein the hydroxyl-containing organic substance comprises a hydroxyl acrylate resin and a polybutadiene polyol.
6. The liquid optical adhesive according to claim 5, wherein the hydroxyl group-containing organic material comprises 60 to 85 wt% of a hydroxyl acrylate resin and 15 to 40 wt% of a polybutadiene polyol, based on the total amount of the hydroxyl group-containing organic material.
7. The liquid optical cement for inkjet according to claim 5, wherein the hydroxy acrylate resin is one or more selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate and hydroxybutyl methacrylate, and the polybutadiene polyol is one or more selected from the group consisting of hydrogenated polybutadiene polyol, hydroxyl-terminated polybutadiene and hydrogenated hydroxyl-terminated polybutadiene.
8. The liquid optical cement for inkjet according to claim 1, wherein the acrylate-based reactive diluent is a mixture of at least two selected from the group consisting of isobornyl acrylate, isobornyl methacrylate, lauryl acrylate, hydroxybutyl acrylate, tetrahydrofurfuryl acrylate and tetrahydrofurfuryl methacrylate.
9. The liquid optical paste according to claim 1, wherein the photoinitiator is one or more selected from the group consisting of 2-hydroxy-2-methylphenylacetone, phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide, diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide, and 1-hydroxycyclohexylphenylketone.
10. The liquid optical cement for inkjet according to claim 1, wherein the polymerization inhibitor is p-hydroxyanisole.
11. The liquid optical ink-jet adhesive according to claim 1, wherein the light stabilizer is bis (1,2,2,6, 6-pentamethyl-4-piperidinyl) sebacate.
12. The liquid optical cement for inkjet according to claim 1, wherein the antioxidant is one or more of 2, 6-di-tert-butyl-4-methylphenol and didodecyl thiodipropionate.
13. The wet heat resistant liquid optical adhesive for inkjet according to claim 1, wherein the coupling agent is 3- (2, 3-glycidoxy) propyltrimethoxysilane.
14. The liquid optical cement for inkjet according to claim 1, wherein the additive is one or more of a defoaming agent and a surfactant.
15. The liquid optical cement for inkjet according to claim 14, wherein the defoaming agent is polydimethylsiloxane.
16. The liquid optical cement for inkjet according to claim 1, wherein the viscosity of the liquid optical cement for inkjet is 0 to 50 mPa.s.
CN202210364778.5A 2022-04-08 2022-04-08 Liquid optical cement for ink jet Pending CN114574151A (en)

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