Ink-jet OCRUV curing glue for UTG bonding and preparation method of ink-jet OCRUV curing glue

Abstract

The invention discloses ink jet OCRUV curing glue for UTG bonding and a preparation method thereof, the glue comprises the following raw material components in parts by weight: 10-30 parts of acrylate oligomer, 20-60 parts of first soft monomer, 10-30 parts of second soft monomer, 1-5 parts of first functional monomer, 1-5 parts of second functional monomer, 5-15 parts of hard monomer, 0.05-0.5 part of crosslinking monomer and 1-4 parts of photoinitiator, and 0.1-2 parts of an auxiliary agent. The AOI monomer is innovatively used in the acrylate oligomer in the formula, so that the viscosity of the polymer is greatly reduced compared with that of conventionally synthesized resin, and stable proceeding of an ink jet process is facilitated; in addition, hydroxyl-terminated silicone oil is introduced into the acrylate oligomer, so that the bonding of the UTG is guaranteed. Various monomers are matched for use, so that the low-temperature flexibility is ensured, the adhesion to a base material is also provided, and the bending effect is further ensured.

Description

Technical Field

[0001] The invention relates to the field of adhesive materials for UTG, and in particular to an inkjet OCRUV curing glue for UTG bonding and a preparation method thereof. Background Art

[0002] As the technology continues to mature and the cost gradually decreases, UTG has broad application prospects in the foldable and curved display market. It is expected that in the next few years, with the improvement of consumer acceptance of foldable devices and the continuous innovation of technology, UTG will become an important driving force for the growth of the entire industry. In particular, in the fields of high-end smartphones, wearable devices, and in-vehicle display systems, UTG's market share is expected to grow rapidly.

[0003] UTG material has excellent light transmittance, ensuring the brightness and color saturation of the display, which is crucial to improving the visual experience. Compared with plastic substrates, UTG is more resistant to scratches and wear, extending the service life of foldable devices. UTG can withstand higher operating temperatures, which is conducive to the stable performance of the display under high-load operation, especially in fast charging scenarios. Compared with some plastic materials, UTG is more sustainable and in line with the green trend of electronic products.

[0004] Although it is called "ultra-thin glass", its physical properties determine that it is still likely to break under strong impact, and additional protective measures need to be added during the design, such as increasing the thickness. Although UTG's toughness is better than traditional glass, the increase in thickness reduces its performance when bent, which may affect its structural integrity and limit the service life of foldable devices.

[0005] To solve the above problems, the prior art usually proceeds from two directions. On the one hand, the thickness of UTG is reduced by process adjustment to improve the bending performance, but the impact resistance effect is not ideal; on the other hand, by reducing the thickness of UTG and using a reinforcing film at the same time, the overall effect is improved to a certain extent. In summary, the present invention is intended to provide an OCR glue, and the corresponding UTG only reduces the thickness in the bending area, and uses the glue provided by the present invention for bonding. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an inkjet OCRUV curing glue for UTG bonding and a preparation method thereof in view of the deficiencies in the above-mentioned prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: in the first aspect of the present invention, an inkjet OCRUV curing glue for UTG bonding is provided, comprising the following raw material components in parts by weight: 10-30 parts of acrylate oligomer, 20-60 parts of first soft monomer, 10-30 parts of second soft monomer, 1-5 parts of first functional monomer, 1-5 parts of second functional monomer, 5-15 parts of hard monomer, 0.05-0.5 parts of cross-linking monomer, 1-4 parts of photoinitiator, and 0.1-2 parts of auxiliary agent;

[0008] The raw materials for preparing the acrylate oligomer include, by weight: 70-90 parts of polyether polyol, 10-30 parts of dihydroxy silicone oil, 10-20 parts of isocyanate ethyl acrylate, and 10-20 parts of hexamethylene diisocyanate.

[0009] Preferably, the first soft monomer is selected from at least one of alkyl or isomerized alkyl acrylates, wherein the C number of the alkyl group is 4 to 8;

[0010] The first soft monomer is selected from at least one of alkyl or isomerized alkyl acrylate, wherein the C number of the alkyl group is 12-18.

[0011] Preferably, the first soft monomer is selected from at least one of (iso)butyl acrylate, n-hexyl acrylate, and (iso)octyl acrylate;

[0012] The second soft monomer is selected from at least one of (iso)dodecyl acrylate, (iso)hexadecyl acrylate and (iso)octadecyl acrylate.

[0013] Preferably, the first functional monomer is selected from at least one of hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate;

[0014] The second functional monomer is selected from at least one of acrylamide, acryloylmorpholine, vinyl pyrrolidone, vinyl caprolactam and hydroxyethyl acrylamide.

[0015] Preferably, the hard monomer is selected from at least one of (methyl)isobornyl acrylate, (methyl)trimethylcyclohexyl acrylate, (methyl)phenoxyethyl acrylate, and (methyl)cyclotrimethylolpropane acrylate;

[0016] The crosslinking monomer is selected from at least one of 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate and dipentaerythritol hexaacrylate.

[0017] Preferably, the photoinitiator is selected from at least one of 1-hydroxy-cyclohexyl benzophenone, 2-hydroxy-2-methyl-phenylacetone, 2-methyl-1(4-methylthiophenyl)-2-morpholinyl-1-propanone, benzoin dimethyl ether, benzoin diethyl ether, 2,4,6-trimethylbenzoyl ethyl phosphate, and phenyl bis(2,4,6-trimethylbenzoylphosphine oxide);

[0018] The auxiliary agent includes at least one of a defoamer, a wetting agent, an adhesion promoter, a dispersant, a leveling agent, and a silane coupling agent.

[0019] Preferably, the acrylate oligomer is prepared by the following method:

[0020] S1. Mix polyether polyol and dihydroxy silicone oil, evacuate and heat to 120°C for dehydration, measure the moisture content with a Karl Fischer tester every hour until it is less than 0.2%, and then cool to 50°C;

[0021] S2, adding hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer;

[0022] S3. Add ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. for reaction for 2 hours, use an automatic potentiometric titrator to test the NCO content, test the NCO content once every 1 hour until it is stable and no longer changes, and then cool to below 40° C. to obtain the acrylate oligomer.

[0023] Preferably, the acrylate oligomer is prepared by the following method:

[0024] S1, 80 parts by weight of polyether polyol and 20 parts by weight of dihydroxy silicone oil were mixed, vacuumed and heated to 120° C. for dehydration, and the moisture content was measured using a Karl Fischer tester every hour until it was less than 0.2%, and then the temperature was lowered to 50° C.;

[0025] S2, adding 13 parts by weight of hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer;

[0026] S3. Add 16 parts by weight of ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. for reaction for 2 hours, use an automatic potentiometric titrator to test the NCO content, test the NCO content once every 1 hour until it is stable and no longer changes, and cool down to below 40° C. to obtain the acrylate oligomer.

[0027] Preferably, the polyether polyol is polyether polyol DE2500, and the molecular weight of the dihydroxy silicone oil is 500.

[0028] The second aspect of the present invention provides a method for preparing the inkjet OCRUV curing glue for UTG bonding as described above, the method comprising:

[0029] Under the conditions of avoiding light and with humidity less than 50%, the acrylate oligomer, the first soft monomer, the second soft monomer, the first functional monomer, the second functional monomer, the hard monomer, the cross-linking monomer, the photoinitiator and the auxiliary agent are mixed and dissolved, stirred evenly and filtered to obtain the inkjet OCRUV curing glue for UTG bonding.

[0030] When the glue of the present invention is used for UTG bonding, the corresponding UTG only reduces thickness in the bending area and is bonded using the glue provided by the present invention. The glue has extremely low viscosity and uses a dedicated inkjet device to perfectly solve micron-level gap filling, irregular shape spraying, and ultra-thin coating. At the same time, the glue has a rapid curing effect. Under UV irradiation, cross-linking and hardening can be completed in a few seconds. After hardening, the bonding effect can be guaranteed and the long-term use tolerance can be improved.

[0031] The beneficial effects of the present invention are:

[0032] The present invention provides an inkjet OCRUV curing glue for UTG bonding and a preparation method thereof. The acrylate oligomer in the formula of the present invention innovatively uses AOI monomer (ethyl isocyanate acrylate), so that the viscosity of the polymer is greatly reduced compared with conventional synthetic resins, which is beneficial to the stable operation of the inkjet process; in addition, terminal hydroxyl silicone oil is introduced into the acrylate oligomer to provide a guarantee for UTG bonding;

[0033] The combination of various monomers in the present invention not only ensures low-temperature flexibility, but also provides adhesion to the substrate and guarantees the bending effect;

[0034] The photoinitiator in the formulation of the present invention is a compound of two initiators, which not only ensures the curing property but also provides excellent compatibility and optical properties after curing. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0036] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0037] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0038] The present invention provides an inkjet OCRUV curing glue for UTG bonding, comprising the following raw material components in parts by weight: 10-30 parts of acrylate oligomer, 20-60 parts of first soft monomer, 10-30 parts of second soft monomer, 1-5 parts of first functional monomer, 1-5 parts of second functional monomer, 5-15 parts of hard monomer, 0.05-0.5 parts of cross-linking monomer, 1-4 parts of photoinitiator, and 0.1-2 parts of auxiliary agent;

[0039] The raw materials for preparing the acrylate oligomer include, by weight: 70-90 parts of polyether polyol, 10-30 parts of dihydroxy silicone oil, 10-20 parts of isocyanate ethyl acrylate, and 10-20 parts of hexamethylene diisocyanate.

[0040] In a preferred embodiment, the first soft monomer is selected from at least one of alkyl or isomerized alkyl acrylates, wherein the alkyl carbon number is 4 to 8. For example, it is selected from at least one of (iso)butyl acrylate, n-hexyl acrylate, and (iso)octyl acrylate.

[0041] In a preferred embodiment, the second soft monomer is selected from at least one of alkyl or isomerized alkyl acrylates, wherein the alkyl group has a carbon number of 12 to 18. For example, it is selected from at least one of (iso)dodecyl acrylate, (iso)hexadecyl acrylate, and (iso)octadecyl acrylate.

[0042] In a preferred embodiment, the first functional monomer is an acrylic acid ester monomer containing a hydroxyl unit, for example, at least one selected from hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate.

[0043] In a preferred embodiment, the second functional monomer is a nitrogen-containing unit monomer with a terminal double bond, for example, at least one selected from acrylamide, acryloylmorpholine, vinyl pyrrolidone, vinyl caprolactam, and hydroxyethyl acrylamide.

[0044] In a preferred embodiment, the hard monomer is selected from at least one of (methyl)isobornyl acrylate, (methyl)trimethylcyclohexyl acrylate, (methyl)phenoxyethyl acrylate, and (methyl)cyclotrimethylolpropane acrylate.

[0045] In a preferred embodiment, the crosslinking monomer is selected from at least one of 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate and dipentaerythritol hexaacrylate.

[0046] In a preferred embodiment, the photoinitiator is selected from at least one of 1-hydroxy-cyclohexyl benzophenone, 2-hydroxy-2-methyl-phenylacetone, 2-methyl-1(4-methylthiophenyl)-2-morpholinyl-1-propanone, benzoin dimethyl ether, benzoin diethyl ether, 2,4,6-trimethylbenzoyl ethyl phosphate, and phenyl bis(2,4,6-trimethylbenzoyl phosphine oxide).

[0047] In a preferred embodiment, the additive includes at least one of a defoamer, a wetting agent, an adhesion promoter, a dispersant, a leveling agent, and a silane coupling agent, for example, at least one selected from BYK-088, BYK A530, BYK 980, BYK DISPER 163, BYK333, BYK 3550, BYK3560, BYK3565, BYK 4500, BYK 4510, KH560, KH 570, A187, etc.

[0048] In a preferred embodiment, the acrylate oligomer is prepared by the following method:

[0049] S1. Mix polyether polyol and dihydroxy silicone oil, evacuate and heat to 120°C for dehydration, measure the moisture content with a Karl Fischer tester every hour until it is less than 0.2%, and then cool to 50°C;

[0050] S2, adding hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer;

[0051] S3. Add ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. for reaction for 2 hours, use an automatic potentiometric titrator to test the NCO content, test the NCO content once every 1 hour until it is stable and no longer changes, and then cool to below 40° C. to obtain an acrylate oligomer.

[0052] In a preferred embodiment, the acrylate oligomer is prepared by the following method:

[0053] S1, 80 parts by weight of polyether polyol and 20 parts by weight of dihydroxy silicone oil were mixed, vacuumed and heated to 120° C. for dehydration, and the moisture content was measured using a Karl Fischer tester every hour until it was less than 0.2%, and then the temperature was lowered to 50° C.;

[0054] S2, adding 13 parts by weight of hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer;

[0055] S3. Add 16 parts by weight of ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. and react for 2 hours. Use an automatic potentiometric titrator to test the NCO content. Test the NCO content every 1 hour until it is stable and no longer changes. Lower the temperature to below 40° C. to obtain an acrylate oligomer.

[0056] In a preferred embodiment, the polyether polyol is polyether polyol DE2500, and the molecular weight of the dihydroxy silicone oil is 500.

[0057] The acrylic ester oligomer prepared in the present invention uses a flexible polyether polyol, so that the product can provide high softness and high elongation; the low molecular weight dihydroxy silicone oil is innovatively used, which has excellent adhesion performance to UTG according to the principle of similar compatibility, and at the same time provides excellent elastic performance, so that the bending performance of the product is greatly improved; the innovative use of isocyanate ethyl acrylate as a post-grafting monomer can obtain a polymer with lower viscosity, thereby providing a larger design space for the low viscosity requirement required by the inkjet process.

[0058] The present invention also provides a method for preparing the above inkjet OCRUV curing glue for UTG bonding, the method comprising:

[0059] Under the condition of avoiding light and keeping humidity less than 50%, the acrylate oligomer, the first soft monomer, the second soft monomer, the first functional monomer, the second functional monomer, the hard monomer, the cross-linking monomer, the photoinitiator and the auxiliary agent are mixed and dissolved, stirred evenly, filtered, and the inkjet OCRUV curing glue for UTG bonding is obtained, which is packaged in a special packaging bottle / barrel, sealed and stored away from light.

[0060] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0061] The main raw materials and their sources involved in the following examples and comparative examples are described in Table 1:

[0062] Table 1

[0063]

[0064]

[0065] Example 1

[0066] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0067] 1. Preparation of acrylate oligomers

[0068] 80 parts of polyether polyol DE2500 and 20 parts of dihydroxy silicone oil (molecular weight 500) are added to a container, vacuumed and heated to 120°C for dehydration, and the water content is measured by Karl Fischer tester every 1 hour until it is less than 0.2%, and then the temperature is lowered to 50°C. 13 parts of hexamethylene diisocyanate are added, the temperature is raised to 80°C for reaction for 2 hours, the NCO content is tested by automatic potentiometric titrator, and then the NCO content is tested every 1 hour until it is stable and no longer changes, and the temperature is lowered to 45°C to obtain a prepolymer. 16 parts of isocyanate ethyl acrylate are added to the above prepolymer, the temperature is raised to 80°C for reaction for 2 hours, the NCO content is tested by automatic potentiometric titrator, and then the NCO content is tested every 1 hour until it is stable and no longer changes, and the temperature is lowered to below 40°C to obtain an acrylate oligomer.

[0069] 2. Prepare glue

[0070] Under the conditions of avoiding light and keeping humidity less than 50%, 10 parts of acrylate oligomer (self-made), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, and after being fully stirred and dissolved, the mixture was filtered to obtain an inkjet OCR UV glue for UTG bonding.

[0071] The above raw material ratios are all based on weight parts, and the remaining embodiments are the same as the comparative examples.

[0072] Example 2

[0073] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0074] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0075] 2. Prepare glue

[0076] Under the conditions of avoiding light and keeping humidity less than 50%, 30 parts of acrylate oligomer (self-made), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, stirred and dissolved thoroughly, and then filtered to obtain inkjet OCR UV glue for UTG bonding.

[0077] Example 3

[0078] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0079] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0080] 2. Prepare glue

[0081] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (homemade), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 0.5 parts of photoinitiator 184, 0.5 parts of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, stirred and dissolved thoroughly, and then filtered to obtain inkjet OCR UV glue for UTG bonding.

[0082] Example 4

[0083] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0084] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0085] 2. Prepare glue

[0086] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (self-made), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 2 parts of photoinitiator 184, 2 parts of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333, and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, and after being fully stirred and dissolved, the mixture was filtered to obtain inkjet OCR UV glue for UTG bonding.

[0087] Example 5

[0088] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0089] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0090] 2. Prepare glue

[0091] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (homemade), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.05 parts of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, stirred and dissolved thoroughly, and then filtered to obtain inkjet OCR UV glue for UTG bonding.

[0092] Example 6

[0093] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0094] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0095] 2. Prepare glue

[0096] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (homemade), 25 parts of butyl acrylate, 22 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.5 parts of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, stirred and dissolved thoroughly, and then filtered to obtain inkjet OCR UV glue for UTG bonding.

[0097] Comparative Example 1

[0098] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0099] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0100] 2. Prepare glue

[0101] Under the conditions of avoiding light and keeping humidity less than 50%, 40 parts of acrylate oligomer (self-made), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333 and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, stirred and dissolved thoroughly, and then filtered to obtain inkjet OCR UV glue for UTG bonding.

[0102] Comparative Example 2

[0103] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0104] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0105] 2. Prepare glue

[0106] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (homemade), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 1 part of 1,6-hexanediol diacrylate, 1 part of photoinitiator 184, 1 part of photoinitiator TPO-L, 0.2 parts of silane coupling agent A187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333, and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, and after being fully stirred and dissolved, the mixture was filtered to obtain inkjet OCR UV glue for UTG bonding.

[0107] Comparative Example 3

[0108] An inkjet OCRUV curing glue for UTG bonding, the preparation method is as follows:

[0109] 1. Prepare acrylate oligomers in the same manner as in Example 1;

[0110] 2. Prepare glue

[0111] Under the conditions of avoiding light and keeping humidity less than 50%, 20 parts of acrylate oligomer (self-made), 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 20 parts of dodecyl acrylate, 4 parts of hydroxybutyl acrylate, 3 parts of acryloylmorpholine, 10 parts of cyclotrimethylolpropane acrylate, 0.2 parts of 1,6-hexanediol diacrylate, 4 parts of photoinitiator 184, 4 parts of photoinitiator TPO-L, 0.2 parts of silane coupling agent A 187, 0.1 parts of defoaming agent BYK088, 0.3 parts of leveling agent BYK333, and 0.4 parts of adhesion promoter BYK4510 were accurately weighed, and after being fully stirred and dissolved, the mixture was filtered to obtain inkjet OCR UV glue for UTG bonding.

[0112] The formula summary of the embodiments and comparative examples is shown in Table 2 below:

[0113] Table 2

[0114]

[0115] The glue prepared in Examples 1-6 and Comparative Examples 1-3 was subjected to relevant performance tests, wherein the curing conditions of the glue were: ultraviolet irradiation at a UV-LED 365 wavelength with a cumulative energy of 5000 mj.

[0116] Storage modulus, creep recovery and Tg testing: The cured specimens were tested using an advanced rheology tester under the following conditions:

[0117] Test equipment: TA, ARES-G2

[0118] Test piece size: ∮8*1mm

[0119] Temperature range: -40~90℃

[0120] Heating rate: 3℃ / min

[0121] Deformation Mode: Shear

[0122] Test frequency: 1Hz

[0123] Test load: 10KPa

[0124] Load time: 10min

[0125] The test items, methods and results are shown in Table 3 below:

[0126] Table 3

[0127]

[0128] It can be seen from the test results in Table 3 that the glues of Examples 1-6 of the present invention have excellent properties. Although the overall performance of Comparative Example 1 is good, the high viscosity leads to poor spraying, which is mainly caused by the excessive addition of acrylate oligomers. Comparative Example 2 uses too much cross-linking monomer, which makes the cross-linking density too large, and the elongation at break is greatly reduced, resulting in bending failure. Comparative Example 3 uses too much photoinitiator, and it is found that the creep recovery and bonding strength of the product are greatly reduced, which may be caused by the termination of chain growth due to the cleavage coupling of too much initiator.

[0129] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. An inkjet OCRUV curing glue for UTG bonding, characterized in that: The invention comprises the following raw material components in parts by weight: 10-30 parts of acrylate oligomer, 20-60 parts of first soft monomer, 10-30 parts of second soft monomer, 1-5 parts of first functional monomer, 1-5 parts of second functional monomer, 5-15 parts of hard monomer, 0.05-0.5 parts of crosslinking monomer, 1-4 parts of photoinitiator and 0.1-2 parts of auxiliary agent; The raw materials for preparing the acrylate oligomer include, by weight: 70-90 parts of polyether polyol, 10-30 parts of dihydroxy silicone oil, 10-20 parts of isocyanate ethyl acrylate, and 10-20 parts of hexamethylene diisocyanate.

2. The inkjet OCRUV curing glue for UTG bonding according to claim 1, characterized in that: The first soft monomer is selected from at least one of alkyl or isomerized alkyl acrylates, wherein the number of carbon atoms in the alkyl group is 4 to 8; The second soft monomer is selected from at least one of alkyl or isomerized alkyl acrylates, wherein the C number of the alkyl group is 12-18.

3. The inkjet OCRUV curing glue for UTG bonding according to claim 2, characterized in that: The first soft monomer is selected from at least one of (iso)butyl acrylate, n-hexyl acrylate, and (iso)octyl acrylate; The second soft monomer is selected from at least one of (iso)dodecyl acrylate, (iso)hexadecyl acrylate and (iso)octadecyl acrylate.

4. The inkjet OCRUV curing glue for UTG bonding according to claim 1, characterized in that: The first functional monomer is selected from at least one of hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate; The second functional monomer is selected from at least one of acrylamide, acryloylmorpholine, vinyl pyrrolidone, vinyl caprolactam and hydroxyethyl acrylamide.

5. The inkjet OCRUV curing glue for UTG bonding according to claim 1, characterized in that: The hard monomer is selected from at least one of (methyl) isobornyl acrylate, (methyl) trimethylcyclohexyl acrylate, (methyl) phenoxyethyl acrylate, and (methyl) cyclotrimethylolpropane acrylate; The cross-linking monomer is selected from at least one of 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate and dipentaerythritol hexaacrylate.

6. The inkjet OCRUV curing glue for UTG bonding according to claim 1, characterized in that: The photoinitiator is selected from at least one of 1-hydroxy-cyclohexyl benzophenone, 2-hydroxy-2-methyl-phenylacetone, 2-methyl-1 (4-methylthiophenyl)-2-morpholinyl-1-propanone, benzoin dimethyl ether, benzoin diethyl ether, 2,4,6-trimethylbenzoyl ethyl phosphate, and phenyl bis (2,4,6-trimethylbenzoyl phosphine oxide); The auxiliary agent includes at least one of a defoamer, a wetting agent, an adhesion promoter, a dispersant, a leveling agent, and a silane coupling agent.

7. The inkjet OCRUV curing glue for UTG bonding according to claim 1, characterized in that: The acrylate oligomer is prepared by the following method: S1. Mix polyether polyol and dihydroxy silicone oil, evacuate and heat to 120°C for dehydration, measure the moisture content with a Karl Fischer tester every hour until it is less than 0.2%, and then cool to 50°C; S2, adding hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer; S3. Add ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. for reaction for 2 hours, use an automatic potentiometric titrator to test the NCO content, test the NCO content once every 1 hour until it is stable and no longer changes, and then cool to below 40° C. to obtain the acrylate oligomer.

8. The inkjet OCRUV curing glue for UTG bonding according to claim 7, characterized in that: The acrylate oligomer is prepared by the following method: S1, 80 parts by weight of polyether polyol and 20 parts by weight of dihydroxy silicone oil were mixed, vacuumed and heated to 120° C. for dehydration, and the moisture content was measured using a Karl Fischer tester every hour until it was less than 0.2%, and then the temperature was lowered to 50° C.; S2, adding 13 parts by weight of hexamethylene diisocyanate, heating to 80°C for reaction for 2 hours, using an automatic potentiometric titrator to test the NCO content, testing the NCO content every 1 hour until it is stable and no longer changes, and cooling to 45°C to obtain a prepolymer; S3. Add 16 parts by weight of ethyl isocyanate acrylate to the prepolymer obtained in step S2, raise the temperature to 80° C. for reaction for 2 hours, use an automatic potentiometric titrator to test the NCO content, test the NCO content once every 1 hour until it is stable and no longer changes, and cool down to below 40° C. to obtain the acrylate oligomer.

9. The inkjet OCRUV curing glue for UTG bonding according to claim 8, characterized in that: The polyether polyol is polyether polyol DE2500, and the molecular weight of the dihydroxy silicone oil is 500.

10. A method for preparing an inkjet OCRUV curing glue for UTG bonding as claimed in any one of claims 1 to 9, characterized in that: The method is: Under the conditions of avoiding light and with humidity less than 50%, the acrylate oligomer, the first soft monomer, the second soft monomer, the first functional monomer, the second functional monomer, the hard monomer, the cross-linking monomer, the photoinitiator and the auxiliary agent are mixed and dissolved, stirred evenly and filtered to obtain the inkjet OCRUV curing glue for UTG bonding.

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