CN114574151A - Liquid optical cement for ink jet - Google Patents
Liquid optical cement for ink jet Download PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- liquid optical
- acrylate
- optical cement
- hydroxyl
- inkjet according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 105
- 239000007788 liquid Substances 0.000 title claims abstract description 81
- 239000004568 cement Substances 0.000 title claims description 47
- 239000000853 adhesive Substances 0.000 claims abstract description 55
- 230000001070 adhesive effect Effects 0.000 claims abstract description 55
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims abstract description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000007822 coupling agent Substances 0.000 claims abstract description 12
- 239000003085 diluting agent Substances 0.000 claims abstract description 12
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 239000003112 inhibitor Substances 0.000 claims abstract description 10
- 239000004611 light stabiliser Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 18
- 239000005062 Polybutadiene Substances 0.000 claims description 13
- 229920002857 polybutadiene Polymers 0.000 claims description 13
- 229920005862 polyol Polymers 0.000 claims description 13
- 150000003077 polyols Chemical class 0.000 claims description 13
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 claims description 11
- 239000004925 Acrylic resin Substances 0.000 claims description 10
- AZIQALWHRUQPHV-UHFFFAOYSA-N prop-2-eneperoxoic acid Chemical compound OOC(=O)C=C AZIQALWHRUQPHV-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 125000005442 diisocyanate group Chemical group 0.000 claims description 8
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 claims description 7
- LCXXNKZQVOXMEH-UHFFFAOYSA-N Tetrahydrofurfuryl methacrylate Chemical compound CC(=C)C(=O)OCC1CCCO1 LCXXNKZQVOXMEH-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229920002121 Hydroxyl-terminated polybutadiene Polymers 0.000 claims description 6
- IAXXETNIOYFMLW-COPLHBTASA-N [(1s,3s,4s)-4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl] 2-methylprop-2-enoate Chemical compound C1C[C@]2(C)[C@@H](OC(=O)C(=C)C)C[C@H]1C2(C)C IAXXETNIOYFMLW-COPLHBTASA-N 0.000 claims description 6
- 229940119545 isobornyl methacrylate Drugs 0.000 claims description 6
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 claims description 6
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical group COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 claims description 6
- -1 polydimethylsiloxane Polymers 0.000 claims description 6
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 5
- RDLGTRBJUAWSAF-UHFFFAOYSA-N 1-(6-hydroxy-6-methylcyclohexa-2,4-dien-1-yl)propan-2-one Chemical compound CC(=O)CC1C=CC=CC1(C)O RDLGTRBJUAWSAF-UHFFFAOYSA-N 0.000 claims description 5
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 5
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 claims description 5
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims description 5
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 5
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 claims description 5
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000011368 organic material Substances 0.000 claims description 5
- MUTNCGKQJGXKEM-UHFFFAOYSA-N tamibarotene Chemical compound C=1C=C2C(C)(C)CCC(C)(C)C2=CC=1NC(=O)C1=CC=C(C(O)=O)C=C1 MUTNCGKQJGXKEM-UHFFFAOYSA-N 0.000 claims description 5
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 5
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 claims description 4
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 4
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 claims description 4
- RSOILICUEWXSLA-UHFFFAOYSA-N bis(1,2,2,6,6-pentamethylpiperidin-4-yl) decanedioate Chemical group C1C(C)(C)N(C)C(C)(C)CC1OC(=O)CCCCCCCCC(=O)OC1CC(C)(C)N(C)C(C)(C)C1 RSOILICUEWXSLA-UHFFFAOYSA-N 0.000 claims description 4
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 claims description 4
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 claims description 4
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 claims description 3
- SBJCUZQNHOLYMD-UHFFFAOYSA-N 1,5-Naphthalene diisocyanate Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1N=C=O SBJCUZQNHOLYMD-UHFFFAOYSA-N 0.000 claims description 3
- IEVADDDOVGMCSI-UHFFFAOYSA-N 2-hydroxybutyl 2-methylprop-2-enoate Chemical compound CCC(O)COC(=O)C(C)=C IEVADDDOVGMCSI-UHFFFAOYSA-N 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims 1
- 238000007641 inkjet printing Methods 0.000 abstract description 15
- 238000002834 transmittance Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 12
- 239000004814 polyurethane Substances 0.000 abstract description 7
- 229920002635 polyurethane Polymers 0.000 abstract description 7
- 238000003860 storage Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 10
- 230000004907 flux Effects 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 238000004383 yellowing Methods 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- ZXHZWRZAWJVPIC-UHFFFAOYSA-N 1,2-diisocyanatonaphthalene Chemical compound C1=CC=CC2=C(N=C=O)C(N=C=O)=CC=C21 ZXHZWRZAWJVPIC-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000004713 Cyclic olefin copolymer Substances 0.000 description 1
- 239000004262 Ethyl gallate Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6204—Polymers of olefins
- C08G18/6208—Hydrogenated polymers of conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/69—Polymers of conjugated dienes
- C08G18/698—Mixtures with compounds of group C08G18/40
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates 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
- C08G18/753—Polyisocyanates 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
- C08G18/755—Polyisocyanates 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
Landscapes
- 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
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
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
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
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.
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