UV-cured transparent protective glue for ink-jet printing and preparation method of UV-cured transparent protective glue

Abstract

The invention relates to the technical field of transparent protective glue, and particularly discloses UV (ultraviolet) curing transparent protective glue for ink-jet printing and a preparation method of the UV curing transparent protective glue. The UV curing transparent protective glue for ink-jet printing is prepared from the following components in parts by weight: 25 to 30 parts of alicyclic epoxy resin, 5 to 20 parts of monooxetane monomers, 5 to 20 parts of dioxetane monomers, 10 to 15 parts of acrylic acid oxetane dual-curing monomers, 2 to 3 parts of an initiator, 0.5 to 1 part of an antioxidant, 0.5 to 1 part of a stabilizer, 0.5 to 1 part of a coupling agent and 0.3 to 0.5 part of a flatting agent. Aiming at the problems of insufficient transparency, curing yellowing, weak strong alkali resistance, low adhesive force and the like of the existing glass substrate transparent protective adhesive, the invention provides the brand-new UV curing transparent protective adhesive for ink-jet printing. Researches show that the UV curing transparent protective glue for ink-jet printing has the advantages of good transparency, yellowing resistance, strong alkali resistance and good adhesive force, and has important application value.

Description

Technical Field

[0001] The present invention relates to the technical field of transparent protective adhesives, and particularly relates to a UV-curable transparent protective adhesive for inkjet printing and a preparation method thereof. Background Art

[0002] With the advantages of high precision, customization, and no need for plate making, inkjet printing technology has been widely used in the preparation of transparent protective coatings for fields such as glass and optical devices. As the core material, the UV-curable transparent protective adhesive needs to simultaneously meet strict requirements such as being transparent and colorless, having low viscosity (suitable for inkjet spraying), high hardness (4 - 5H), resistance to yellowing (△B < 2 at 150℃×168h), resistance to strong alkali (mass loss ≤ 2% at 45℃×5 minutes in 10% NaOH), and high temperature resistance (viscosity increase ≤ 1.7% at 60℃×10 days). However, there are still significant deficiencies in the prior art in achieving the above performances, specifically as follows: In addition, most existing systems have a single curing mechanism and it is difficult to balance multiple performances: the free radical system has good flexibility but low hardness (pencil hardness < H) and cannot meet the wear resistance requirements of glass substrates (background art of CN110494508A); the cationic system has high hardness (pencil hardness > 2H) but poor flexibility and is difficult to adapt to the bending of flexible substrates (background art of CN117229669A). At the same time, some systems need to add organic solvents (such as propylene glycol methyl ether) to adjust the viscosity, resulting in an increase in VOC emissions (background art of CN109517440A), which does not meet environmental protection requirements; while the low-solvent system has too high viscosity (> 50mPa·s) and cannot be adapted to the inkjet print head (requiring a viscosity of 10 - 20mPa·s) (background art of CN118667384A).

[0003] In response to the above problems, the prior art has tried to optimize the performance by compounding monomers (such as the photopolymerizable composition of CN110494508A) or introducing new initiators (such as the polymerizable initiator of CN102257432A), but there are still the following difficulties: (1) It is difficult to precisely control the synergistic effect between the free radical and cationic systems, which easily leads to phase separation or incomplete curing; (2) Resistance to yellowing requires simultaneously inhibiting initiator residues, monomer shrinkage, and high-temperature oxidation, and the optimization effect of a single component is limited; (3) The contradiction between low viscosity and high hardness is prominent. A high crosslink density is likely to increase the viscosity, while a low crosslinking cannot meet the hardness requirements. Summary of the Invention

[0004] In order to overcome at least one technical problem existing in the prior art, the present invention provides a UV-curable transparent protective adhesive for inkjet printing and a preparation method thereof.

[0005] The technical solution of the present invention is as follows: The present invention first provides a UV-curable transparent protective adhesive for inkjet printing, which comprises the following components in parts by weight: The mixture consists of 25-30 parts alicyclic epoxy resin, 5-20 parts monooxetane monomers, 5-20 parts dioxetane monomers, 10-15 parts acrylic oxetane dual-curing monomers, 2-3 parts initiator, 0.5-1 part antioxidant, 0.5-1 part stabilizer, 0.5-1 part coupling agent, and 0.3-0.5 parts leveling agent.

[0006] Preferably, the alicyclic epoxy resin is selected from one or more combinations of 3,4-epoxycyclohexylcarboxylate-3,4-epoxycyclohexylmethyl ester (EEC), bis((3,4-epoxycyclohexyl)methyl)adipate (BECC), and tetrahydroepoxydiepoxide (THDE).

[0007] Preferably, the monooxane monomer is selected from one or more of 3-ethyl-3-hydroxymethyloxetane (OXT-1), 3-ethyl-3-phenoxyethyloxyethane (POX), 3-ethyl-3-(methacryloyloxymethyl)oxetane (PEOX), and 3-ethyl-3-cyclohexyloxymethyloxetane.

[0008] Preferably, the dioxetane monomer is selected from one or more of 33,3'-(oxydimethylene)bis(3-ethyl)oxetane, bis[1-ethyl(3-oxetane)]methyl ether, 1,4-bis[(3-ethyl-3-oxetane-butylmethoxy)methyl]benzene, and di[(3-ethyl-3-oxetane)methyl] ether.

[0009] Preferably, the oxycyclobutane-based dual-curing monomer is selected from one or more of 3-ethyl-3-oxetane methyl acrylate, oxycyclobutane methacrylate, and 3-ethyl-3-hydroxymethyloxetane methyl acrylate.

[0010] Preferably, the initiator is selected from one or more of the following: triarylthionium salt, dithionium salt, dialkylbenzoylmethylthionium salt, 4-hydroxyphenyl dialkylthionium salt, symmetrical diaryliodothionium salt, asymmetrical diaryliodothionium, and diphenyliodothionium 4-methylbenzenesulfonate.

[0011] Preferably, the initiator is prepared by the following method: (1) 150.2 g of 2,4,6-trimethylbenzoyl chloride, 80.5 g of p-hydroxydiphenylphosphine oxide, and 120 mL of anhydrous pyridine were added to a 500 mL three-necked flask. The reaction temperature was maintained at 0-5 °C. 200 mL of anhydrous pyridine (containing 5% water) was slowly added dropwise at a rate of 2 mL / min. The reaction was kept at this temperature for 3 hours. Then the temperature was raised to 80 °C and the reaction was stirred for another 2 hours. Excess pyridine and the generated HCl gas were removed by vacuum distillation to obtain crude 4-hydroxy-2,4,6-trimethylbenzoylphenylphosphine oxide intermediate. The crude product was recrystallized from anhydrous ethanol (ethanol to crude product mass ratio 3:1), filtered, and vacuum dried to obtain an intermediate with a purity >98.5%. The intermediate was cooled and stored for later use. (2) Add 60.3g of acryloyl chloride, 150mL of anhydrous dichloromethane and 10.2g of triethylamine (as an acid-binding agent) to 100g of the intermediate obtained above. After purging with nitrogen for 30 minutes, maintain the reaction temperature at 0-5℃ and slowly add acryloyl chloride dropwise at a rate of 1mL / min. After the addition is complete, raise the temperature to 25℃ and continue stirring for 6 hours. After the reaction is completed, remove dichloromethane and byproducts (HCl, triethylamine hydrochloride) by vacuum distillation. Wash the residue twice with anhydrous diethyl ether and purify by column chromatography (silica gel as stationary phase, petroleum ether:ethyl acetate = 8:2 as mobile phase) to obtain a product with a purity >99.2%, which is the initiator.

[0012] Preferably, the antioxidant is selected from 2,6-di-tert-butyl-p-cresol (BHT, low cost) and / or 1,6-hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0013] Preferably, the stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and / or bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0014] Preferably, the coupling agent is selected from γ-methacryloxypropyltrimethoxysilane (KH-570, with high coupling efficiency) and / or N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0015] Preferably, the leveling agent is selected from BYK-333 and / or BYK-306 from BYK Chemicals.

[0016] Preferably, the UV-curable transparent protective adhesive for inkjet printing further comprises acrylic monomers; the acrylic monomers are present in parts by weight of 8-10 parts.

[0017] Preferably, the acrylic monomer is prepared by the following method: (1) 120.5 g of melamine, 6.8 g of phosgene, 300.2 g of anhydrous ethanol and 3.2 g of pyridine were added to a 250 mL three-necked flask. Phosgene was slowly added dropwise while maintaining the reaction temperature at 0-5 °C. The reaction was maintained at this temperature for 2 hours, and then the temperature was raised to 80 °C and the reaction was continued for 1 hour. Excess phosgene and HCl were removed by vacuum distillation to obtain crude melamine isocyanuric acid (MICA). The crude product was purified by recrystallization from ethanol to obtain MICA with a purity >98%, which was then cooled for later use.

[0018] (2) Add 45.6g of sodium hydroxide and 150mL of deionized water to 100g of MICA obtained above, stir well, and then add to a high-pressure reactor. Purge with ethylene oxide (initial pressure 0.5MPa), maintain the reaction temperature at 80℃ for 6 hours, and slowly increase the pressure to 1.0MPa to continue the reaction for 4 hours. After the reaction is completed, release the pressure, pour the product into ice water to quench it, neutralize with acetic acid to pH=7, filter, wash the filter cake three times with deionized water, and vacuum dry to obtain tris(2-hydroxyethyl)melamine isocyanuric acid (TM-IE) with a purity >95%.

[0019] (3) Add 48.0g acrylic acid, 0.8g p-toluenesulfonic acid, 0.2g hydroquinone, and 150mL toluene to 100g of TM-IE obtained above. Purge with nitrogen to remove oxygen and maintain the reaction temperature at 110℃ under reflux. Remove the generated water by azeotropic distillation during the reaction. Stop the reaction when the acid value in the system reaches the theoretical value (calculated as 62.5mg(KOH) / g). After the reaction is complete, remove toluene and excess acrylic acid by vacuum distillation. Wash with 5% NaHCO3 solution until neutral, filter, and purify the filter cake by recrystallization with anhydrous ethanol to obtain a product with a purity >99%, which is the acrylic acid monomer.

[0020] The present invention also provides a method for preparing the above-mentioned UV-curable transparent protective adhesive for inkjet printing, which includes the following steps: mixing and stirring an alicyclic epoxy resin, a monooxetine monomer, a dioxetine monomer, an oxyhexacyclic butane dual-curing monomer, an initiator, an antioxidant, a stabilizer, a coupling agent, and a leveling agent until homogeneous to obtain the UV-curable transparent protective adhesive for inkjet printing.

[0021] Beneficial effects: To address the problems of insufficient transparency, yellowing after curing, weak resistance to strong alkalis, and low adhesion of existing transparent protective adhesives for glass substrates, this invention provides a novel UV-curable transparent protective adhesive for inkjet printing. Studies have shown that the UV-curable transparent protective adhesive for inkjet printing described in this invention has the advantages of good transparency, resistance to yellowing, resistance to strong alkalis, and good adhesion, and has significant application value. Detailed Implementation

[0022] The present invention will be explained below with reference to specific embodiments, but the embodiments do not limit the scope of protection of the present invention.

[0023] Example 1: Preparation of UV-curable transparent protective adhesive for inkjet printing Raw material composition by weight: 28 parts aliphatic epoxy resin, 18 parts monooxetine, 15 parts dioxetine, 12 parts dual-curing monomer, 2.5 parts initiator, 0.8 parts antioxidant, 0.8 parts stabilizer, 0.8 parts coupling agent, and 0.6 parts leveling agent.

[0024] The alicyclic epoxy resin is selected from bis((3,4-epoxycyclohexyl)methyl)adipate. The monooxane monomers mentioned are selected from 3-ethyl-3-hydroxymethyloxane; The dioxane monomers mentioned are selected from 1,4-bis[(3-ethyl-3-oxecyclobutylmethoxy)methyl]benzene; The oxyhexacyclobutane-based dual-curing monomer is selected from oxyhexacyclobutane methacrylate; The antioxidant mentioned is selected from 2,6-di-tert-butyl-p-cresol; The stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; The coupling agent is selected from γ-methacryloyloxypropyltrimethoxysilane; The initiator is selected from triarylthionium salts; The leveling agent mentioned is BYK-333 from BYK Chemicals.

[0025] Preparation method: The alicyclic epoxy resin, monooxetine monomer, dioxetine monomer, acrylic oxetine dual-curing monomer, initiator, antioxidant, stabilizer, coupling agent and leveling agent are mixed and stirred evenly to obtain the UV-curable transparent protective adhesive for inkjet printing.

[0026] Example 1: The properties of the UV-curable transparent protective adhesive for inkjet printing are as follows: Yellowing resistance: △B is 2.6 after 150℃×168h; Resistant to strong alkalis: Immersion in 10% NaOH at 45℃ for 5 minutes results in a 2.1% mass loss. Adhesion: Level 1 in cross-cut adhesion test Transparency: Light transmittance is 91.5%; Example 2: Preparation of UV-curable transparent protective adhesive for inkjet printing Raw material composition by weight: 28 parts aliphatic epoxy resin, 18 parts monooxetine, 15 parts dioxetine, 12 parts dual-curing monomer, 2.5 parts initiator, 0.8 parts antioxidant, 0.8 parts stabilizer, 0.8 parts coupling agent, and 0.6 parts leveling agent.

[0027] The alicyclic epoxy resin is selected from bis((3,4-epoxycyclohexyl)methyl)adipate. The monooxane monomers mentioned are selected from 3-ethyl-3-hydroxymethyloxane; The dioxane monomers mentioned are selected from 1,4-bis[(3-ethyl-3-oxecyclobutylmethoxy)methyl]benzene; The oxyhexacyclobutane-based dual-curing monomer is selected from oxyhexacyclobutane methacrylate; The antioxidant mentioned is selected from 2,6-di-tert-butyl-p-cresol; The stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; The coupling agent is selected from γ-methacryloyloxypropyltrimethoxysilane; The initiator is selected from diphenyliodonium-4-methylbenzenesulfonate; The leveling agent mentioned is BYK-333 from BYK Chemicals.

[0028] Preparation method: The alicyclic epoxy resin, monooxetine monomer, dioxetine monomer, acrylic oxetine dual-curing monomer, initiator, antioxidant, stabilizer, coupling agent and leveling agent are mixed and stirred evenly to obtain the UV-curable transparent protective adhesive for inkjet printing.

[0029] Example 2: The properties of the UV-curable transparent protective adhesive for inkjet printing are as follows: Yellowing resistance: △B is 2.2 after 150℃×168h; Resistant to strong alkalis: Immersion in 10% NaOH at 45℃ for 5 minutes results in a mass loss of 1.8%. Adhesion: Level 1 in cross-cut adhesion test Transparency: Light transmittance is 90.8%; Example 3: Preparation of UV-curable transparent protective adhesive for inkjet printing Raw material composition by weight: 28 parts aliphatic epoxy resin, 18 parts monooxetine, 15 parts dioxetine, 12 parts dual-curing monomer, 2.5 parts initiator, 0.8 parts antioxidant, 0.8 parts stabilizer, 0.8 parts coupling agent, and 0.6 parts leveling agent.

[0030] The alicyclic epoxy resin is selected from bis((3,4-epoxycyclohexyl)methyl)adipate. The monooxane monomers mentioned are selected from 3-ethyl-3-hydroxymethyloxane; The dioxane monomers mentioned are selected from 1,4-bis[(3-ethyl-3-oxecyclobutylmethoxy)methyl]benzene; The oxyhexacyclobutane-based dual-curing monomer is selected from oxyhexacyclobutane methacrylate; The antioxidant mentioned is selected from 2,6-di-tert-butyl-p-cresol; The stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; The coupling agent is selected from γ-methacryloyloxypropyltrimethoxysilane; The leveling agent mentioned is BYK-333 from BYK Chemicals; The initiator is prepared by the following method: (1) 150.2 g of 2,4,6-trimethylbenzoyl chloride, 80.5 g of p-hydroxydiphenylphosphine oxide, and 120 mL of anhydrous pyridine were added to a 500 mL three-necked flask. The reaction temperature was maintained at 0-5 °C. 200 mL of anhydrous pyridine (containing 5% water) was slowly added dropwise at a rate of 2 mL / min. The reaction was kept at this temperature for 3 hours. Then the temperature was raised to 80 °C and the reaction was stirred for another 2 hours. Excess pyridine and the generated HCl gas were removed by vacuum distillation to obtain crude 4-hydroxy-2,4,6-trimethylbenzoylphenylphosphine oxide intermediate. The crude product was recrystallized from anhydrous ethanol (ethanol to crude product mass ratio 3:1), filtered, and vacuum dried to obtain an intermediate with a purity >98.5%. The intermediate was cooled and stored for later use. (2) Add 60.3g of acryloyl chloride, 150mL of anhydrous dichloromethane and 10.2g of triethylamine (as an acid-binding agent) to 100g of the intermediate obtained above. After purging with nitrogen for 30 minutes, maintain the reaction temperature at 0-5℃ and slowly add acryloyl chloride dropwise at a rate of 1mL / min. After the addition is complete, raise the temperature to 25℃ and continue stirring for 6 hours. After the reaction is completed, remove dichloromethane and byproducts (HCl, triethylamine hydrochloride) by vacuum distillation. Wash the residue twice with anhydrous diethyl ether and purify by column chromatography (silica gel as stationary phase, petroleum ether:ethyl acetate = 8:2 as mobile phase) to obtain a product with a purity >99.2%, which is the initiator.

[0031] Preparation method: The alicyclic epoxy resin, monooxetine monomer, dioxetine monomer, acrylic oxetine dual-curing monomer, initiator, antioxidant, stabilizer, coupling agent and leveling agent are mixed and stirred evenly to obtain the UV-curable transparent protective adhesive for inkjet printing.

[0032] Example 3: The properties of the UV-curable transparent protective adhesive for inkjet printing are as follows: Yellowing resistance: △B is 0.9 after 150℃×168h; Resistant to strong alkalis: Immersion in 10% NaOH at 45℃ for 5 minutes results in a mass loss of 1.6%. Adhesion: Level 1 in cross-cut adhesion test Transparency: Light transmittance is 93.1%.

[0033] Studies have shown that the yellowing resistance of Example 3 is significantly better than that of Examples 1 and 2. This indicates that the choice of initiator plays an important role in the yellowing resistance of the UV-curable transparent protective adhesive for inkjet printing in this invention. Adding the initiator prepared by the method described in this invention to the UV-curable transparent protective adhesive for inkjet printing can significantly improve the yellowing resistance of the UV-curable transparent protective adhesive for inkjet printing compared to adding conventional initiators.

[0034] Example 4: Preparation of UV-curable transparent protective adhesive for inkjet printing Raw material composition by weight: 28 parts aliphatic epoxy resin, 18 parts monooxetine, 15 parts dioxetine, 12 parts dual-curing monomer, 9 parts acrylic monomer, 2.5 parts initiator, 0.8 parts antioxidant, 0.8 parts stabilizer, 0.8 parts coupling agent, and 0.6 parts leveling agent.

[0035] The alicyclic epoxy resin is selected from bis((3,4-epoxycyclohexyl)methyl)adipate. The monooxane monomers mentioned are selected from 3-ethyl-3-hydroxymethyloxane; The dioxane monomers mentioned are selected from 1,4-bis[(3-ethyl-3-oxecyclobutylmethoxy)methyl]benzene; The oxyhexacyclobutane-based dual-curing monomer is selected from oxyhexacyclobutane methacrylate; The antioxidant mentioned is selected from 2,6-di-tert-butyl-p-cresol; The stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; The coupling agent is selected from γ-methacryloyloxypropyltrimethoxysilane; The leveling agent mentioned is BYK-333 from BYK Chemicals; The initiator is prepared by the following method: (1) 150.2 g of 2,4,6-trimethylbenzoyl chloride, 80.5 g of p-hydroxydiphenylphosphine oxide, and 120 mL of anhydrous pyridine were added to a 500 mL three-necked flask. The reaction temperature was maintained at 0-5 °C. 200 mL of anhydrous pyridine (containing 5% water) was slowly added dropwise at a rate of 2 mL / min. The reaction was kept at this temperature for 3 hours. Then the temperature was raised to 80 °C and the reaction was stirred for another 2 hours. Excess pyridine and the generated HCl gas were removed by vacuum distillation to obtain crude 4-hydroxy-2,4,6-trimethylbenzoylphenylphosphine oxide intermediate. The crude product was recrystallized from anhydrous ethanol (ethanol to crude product mass ratio 3:1), filtered, and vacuum dried to obtain an intermediate with a purity >98.5%. The intermediate was cooled and stored for later use. (2) Add 60.3g of acryloyl chloride, 150mL of anhydrous dichloromethane and 10.2g of triethylamine (as an acid-binding agent) to 100g of the intermediate obtained above. After purging with nitrogen for 30 minutes, maintain the reaction temperature at 0-5℃ and slowly add acryloyl chloride dropwise at a rate of 1mL / min. After the addition is complete, raise the temperature to 25℃ and continue stirring for 6 hours. After the reaction is completed, remove dichloromethane and byproducts (HCl, triethylamine hydrochloride) by vacuum distillation. Wash the residue twice with anhydrous diethyl ether and purify by column chromatography (silica gel as stationary phase, petroleum ether:ethyl acetate = 8:2 as mobile phase) to obtain a product with a purity >99.2%, which is the initiator.

[0036] The acrylic monomer is prepared by the following method: (1) 120.5 g of melamine, 6.8 g of phosgene, 300.2 g of anhydrous ethanol and 3.2 g of pyridine were added to a 250 mL three-necked flask. Phosgene was slowly added dropwise while maintaining the reaction temperature at 0-5 °C. The reaction was maintained at this temperature for 2 hours, and then the temperature was raised to 80 °C and the reaction was continued for 1 hour. Excess phosgene and HCl were removed by vacuum distillation to obtain crude melamine isocyanuric acid (MICA). The crude product was purified by recrystallization from ethanol to obtain MICA with a purity >98%, which was then cooled for later use.

[0037] (2) Add 45.6g of sodium hydroxide and 150mL of deionized water to 100g of MICA obtained above, stir well, and then add to a high-pressure reactor. Purge with ethylene oxide (initial pressure 0.5MPa), maintain the reaction temperature at 80℃ for 6 hours, and slowly increase the pressure to 1.0MPa to continue the reaction for 4 hours. After the reaction is completed, release the pressure, pour the product into ice water to quench it, neutralize with acetic acid to pH=7, filter, wash the filter cake three times with deionized water, and vacuum dry to obtain tris(2-hydroxyethyl)melamine isocyanuric acid (TM-IE) with a purity >95%.

[0038] (3) Add 48.0g acrylic acid, 0.8g p-toluenesulfonic acid, 0.2g hydroquinone, and 150mL toluene to 100g of TM-IE obtained above. Purge with nitrogen to remove oxygen and maintain the reaction temperature at 110℃ under reflux. Remove the generated water by azeotropic distillation during the reaction. Stop the reaction when the acid value in the system reaches the theoretical value (calculated as 62.5mg(KOH) / g). After the reaction is complete, remove toluene and excess acrylic acid by vacuum distillation. Wash with 5% NaHCO3 solution until neutral, filter, and purify the filter cake by recrystallization with anhydrous ethanol to obtain a product with a purity >99%, which is the acrylic acid monomer.

[0039] Preparation method: The alicyclic epoxy resin, monooxetine monomer, dioxetine monomer, acrylic oxetine dual-curing monomer, acrylic monomer, initiator, antioxidant, stabilizer, coupling agent and leveling agent are mixed and stirred evenly to obtain the UV-curable transparent protective adhesive for inkjet printing.

[0040] Example 4: The properties of the UV-curable transparent protective adhesive for inkjet printing are as follows: Yellowing resistance: 150℃×168h, △B is 1.1; Resistant to strong alkalis: Immersion in 10% NaOH at 45℃ for 5 minutes results in a mass loss of only 0.4%. Adhesion: Level 1 in cross-cut adhesion test Transparency: Light transmittance is 91.9%.

[0041] Studies have shown that the strong alkali resistance of Example 4 is significantly better than that of Examples 1-3; this indicates that adding the acrylic monomer prepared by the method described in this invention to the UV-curable transparent protective colloid for inkjet printing can significantly improve the strong alkali resistance of the UV-curable transparent protective colloid for inkjet printing.

Claims

1. A UV-curable transparent protective adhesive for inkjet printing, characterized in that, It contains the following components in parts by weight: The mixture consists of 25-30 parts alicyclic epoxy resin, 5-20 parts monooxetane monomers, 5-20 parts dioxetane monomers, 10-15 parts acrylic oxetane dual-curing monomers, 2-3 parts initiator, 0.5-1 part antioxidant, 0.5-1 part stabilizer, 0.5-1 part coupling agent, and 0.3-0.5 parts leveling agent.

2. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The alicyclic epoxy resin is selected from one or more of 3,4-epoxycyclohexylcarboxylate-3,4-epoxycyclohexylmethyl ester (EEC), bis((3,4-epoxycyclohexyl)methyl)adipate (BECC), and tetrahydroepoxydiepoxide (THDE).

3. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The monooxane monomers are selected from one or more of 3-ethyl-3-hydroxymethyloxetane (OXT-1), 3-ethyl-3-phenoxyethyloxyethane (POX), 3-ethyl-3-(methacryloyloxymethyl)oxetane (PEOX), and 3-ethyl-3-cyclohexyloxymethyloxetane.

4. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The dioxetane monomers are selected from one or more of 33,3'-(oxybismethylene)bis(3-ethyl)oxetane, bis[1-ethyl(3-oxetane)]methyl ether, 1,4-bis[(3-ethyl-3-oxetane-butylmethoxy)methyl]benzene, and di[(3-ethyl-3-oxetane)methyl] ether.

5. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The oxycyclobutane-based dual-curing monomer is selected from one or more of 3-ethyl-3-oxetane methyl acrylate, oxetane methacrylate, and 3-ethyl-3-hydroxymethyloxetane methyl acrylate.

6. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The initiator is selected from one or more of the following: triarylthionium salt, dithionium salt, dialkylbenzoylmethylthionium salt, 4-hydroxyphenyldialkylthionium salt, symmetrical diaryliodothionium salt, asymmetrical diaryliodothionium, and diphenyliodothionium 4-methylbenzenesulfonate.

7. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The antioxidants mentioned are selected from 2,6-di-tert-butyl-p-cresol (BHT, low cost) and / or 1,6-hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

8. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The stabilizer is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and / or bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

9. The UV-curable transparent protective adhesive for inkjet printing according to claim 1, characterized in that, The coupling agent is selected from γ-methacryloxypropyltrimethoxysilane (KH-570, with high coupling efficiency) and / or N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

10. A method for preparing the UV-curable transparent protective adhesive for inkjet printing according to any one of claims 1-9, characterized in that, The process includes the following steps: mixing and stirring an alicyclic epoxy resin, a monooxetine monomer, a dioxetine monomer, an oxyhexacyclic butane dual-curing monomer, an initiator, an antioxidant, a stabilizer, a coupling agent, and a leveling agent until homogeneous to obtain the UV-curable transparent protective adhesive for inkjet printing.