CN117487504A - Water-based UV curing pressure-sensitive adhesive for display device backlight module and preparation method thereof - Google Patents
Water-based UV curing pressure-sensitive adhesive for display device backlight module and preparation method thereof Download PDFInfo
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- CN117487504A CN117487504A CN202311656195.0A CN202311656195A CN117487504A CN 117487504 A CN117487504 A CN 117487504A CN 202311656195 A CN202311656195 A CN 202311656195A CN 117487504 A CN117487504 A CN 117487504A
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- 239000004820 Pressure-sensitive adhesive Substances 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000003848 UV Light-Curing Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229920002635 polyurethane Polymers 0.000 claims abstract description 59
- 239000004814 polyurethane Substances 0.000 claims abstract description 59
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 47
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000006185 dispersion Substances 0.000 claims abstract description 17
- 239000013530 defoamer Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000012948 isocyanate Substances 0.000 claims description 22
- 150000002513 isocyanates Chemical class 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 13
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 11
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 11
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 11
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 11
- 239000002518 antifoaming agent Substances 0.000 claims description 11
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 11
- 230000001804 emulsifying effect Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000009775 high-speed stirring Methods 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 11
- 230000000977 initiatory effect Effects 0.000 claims description 11
- 229920000570 polyether Polymers 0.000 claims description 11
- 229920005862 polyol Polymers 0.000 claims description 11
- 150000003077 polyols Chemical class 0.000 claims description 11
- 238000007348 radical reaction Methods 0.000 claims description 11
- 150000003254 radicals Chemical class 0.000 claims description 11
- -1 acrylic ester Chemical class 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 13
- 230000001070 adhesive effect Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 abstract description 3
- 239000003960 organic solvent Substances 0.000 abstract description 3
- 238000006116 polymerization reaction Methods 0.000 abstract description 3
- 238000004513 sizing Methods 0.000 abstract description 3
- 230000002194 synthesizing effect Effects 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 241000124033 Salix Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/2815—Monohydroxy compounds
- C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
- C08G18/2825—Alkanols, cycloalkanols or arylalkanols including terpenealcohols having at least 6 carbon atoms
-
- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
-
- 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
- C08G18/48—Polyethers
-
- 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
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6692—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/34
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a water-based UV curing pressure-sensitive adhesive for a display device backlight module and a preparation method thereof, wherein the water-based UV curing pressure-sensitive adhesive mainly comprises the following components in parts by weight: 70-90 parts of aqueous polyurethane acrylic acid, 2-5 parts of photoinitiator, 1-3 parts of defoamer, 1-3 parts of flatting agent and 20-40 parts of water. The aqueous UV pressure-sensitive adhesive prepared by the invention combines the advantages of aqueous dispersion and UV curing, does not contain low molecular weight monomers, has viscosity and elasticity obtained by designing and synthesizing a PUA structure, is convenient for sizing by aqueous dispersion, can be directly formed into a pressure-sensitive adhesive strip with initial adhesion after dispensing, is crosslinked by UV curing, greatly improves the peel strength and high temperature resistance of the pressure-sensitive adhesive, has excellent surface dryness and has no oxygen-free air polymerization phenomenon; the automatic degree of the production line can be improved through the water-based UV adhesive, the yield and the yield are improved, the labor cost is reduced, and the carbon emission of the product can be reduced due to the fact that the water-based UV adhesive does not contain organic solvents for volatilization in the production and use processes, so that the water-based UV adhesive is more environment-friendly and energy-saving.
Description
Technical Field
The invention relates to the technical field of willow breeding material preservation, in particular to a water-based UV curing pressure-sensitive adhesive for a display device backlight module and a preparation method thereof.
Background
Currently, the mainstream of the liquid crystal display technology is still that of the liquid crystal display technology, and the backlight module is required to provide a light source for the liquid crystal display, so the reliability of the backlight module has a key effect on the liquid crystal display. In the process of assembling the backlight module, many functional films, such as a light guide plate and a reflective sheet, are usually attached by a double-sided adhesive tape. However, the current manual bonding method can lead to product yield being limited by the proficiency of workers, and under the current dual-carbon policy, the traditional double-sided adhesive tapes face higher carbon discharge pressure, so that various manufacturers have proposed the need to replace the manual bonding double-sided adhesive tapes with machine dispensing.
In order to solve the problem, a general solution is to use UV glue, and after the glue is dispensed by a machine at a required position, the substrate is bonded by UV curing and forming. However, when the existing UV pressure-sensitive adhesive is cured in air, the problem of low peel strength after curing and insufficient adhesion to a substrate due to the oxygen inhibition problem and the problem of easy falling off after high-temperature aging are easily caused, so that the UV pressure-sensitive adhesive with high adhesion and excellent ageing resistance is needed in the industry.
Disclosure of Invention
The invention aims to provide an aqueous UV curing pressure-sensitive adhesive for a display device backlight module and a preparation method thereof, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the aqueous UV curing pressure-sensitive adhesive for the display device backlight module mainly comprises the following components in parts by weight: 70-90 parts of aqueous polyurethane acrylic ester, 2-5 parts of photoinitiator, 1-3 parts of defoamer, 1-3 parts of flatting agent and 20-40 parts of water.
Preferably, the preferable parts by weight of the aqueous UV pressure-sensitive adhesive comprise 80 parts of aqueous polyurethane acrylic acid, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 40 parts of water.
Preferably, the preparation method comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 90-120 ℃ and-0.1 MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
Preferably, the temperature in the step A is reduced to 35-38 ℃.
Preferably, the temperature is raised to 60-65 ℃ in the step B, and the reaction is carried out for 8-9 h.
Preferably, the high-speed stirring speed in the step D is 5000-6000 rpm, and the stirring time is 30-50 min.
Preferably, the defoaming time in the step E is 10min-20min.
Compared with the prior art, the invention has the beneficial effects that: the aqueous UV pressure-sensitive adhesive prepared by the invention combines the advantages of aqueous dispersion and UV curing, does not contain low molecular weight monomers, has viscosity and elasticity obtained by designing and synthesizing a PUA structure, is convenient for sizing by aqueous dispersion, can be directly formed into a pressure-sensitive adhesive strip with initial adhesion after dispensing, is crosslinked by UV curing, greatly improves the peel strength and high temperature resistance of the pressure-sensitive adhesive, has excellent surface dryness and has no oxygen-free air polymerization phenomenon; compared with the adhesive double-sided tape, the automatic degree of the production line can be improved through the aqueous UV adhesive, the yield and the yield are improved, the labor cost is reduced, and the VOC emission is generated because the aqueous UV adhesive does not contain organic solvent for volatilization in the production and use processes, so that the carbon emission of the product can be reduced, and the adhesive double-sided tape is more environment-friendly and energy-saving.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides the following technical scheme: the aqueous UV curing pressure-sensitive adhesive for the display device backlight module mainly comprises the following components in parts by weight: 70-90 parts of aqueous polyurethane acrylic ester, 2-5 parts of photoinitiator, 1-3 parts of defoamer, 1-3 parts of flatting agent and 20-40 parts of water.
Embodiment one:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 70 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 90 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 35 ℃.
In this example, the temperature was raised to 60℃in step B, and the reaction was carried out for 8 hours.
In this example, the high-speed stirring rate in step D was 5000 rpm and the stirring time was 30min.
In this embodiment, the defoaming time in step E is 10min.
Embodiment two:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 75 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 120 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature is reduced to 38℃in step A.
In this example, the temperature was raised to 65℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 6000 rpm and the stirring time was 50min.
In this embodiment, the defoaming time in step E is 20min.
Embodiment III:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 80 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 95 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 36 ℃.
In this example, the temperature was raised to 61℃in step B, and the reaction was carried out for 8 hours.
In this example, the high-speed stirring rate in step D was 5200 rpm and the stirring time was 32 minutes.
In this embodiment, the defoaming time in step E is 12min.
Embodiment four:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 85 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 115 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 37 ℃.
In this example, the temperature was raised to 64℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 5800 rpm and the stirring time was 48 minutes.
In this embodiment, the defoaming time in step E is 18min.
Fifth embodiment:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 90 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 98 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 37 ℃.
In this example, the temperature was raised to 62℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 5400 rpm and the stirring time was 36min.
In this embodiment, the defoaming time in step E is 14min.
Example six:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 80 parts of waterborne polyurethane acrylate, 5 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 110 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 37 ℃.
In this example, the temperature was raised to 63℃in step B, and the reaction was carried out for 8 hours.
In this example, the high-speed stirring rate in step D was 5300 rpm and the stirring time was 38min.
In this embodiment, the defoaming time in step E is 16min.
Embodiment seven:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 80 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 3 parts of defoamer, 1 part of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 100 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 36 ℃.
In this example, the temperature was raised to 64℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 5400 rpm and the stirring time was 42min.
In this embodiment, the defoaming time in step E is 16min.
Example eight:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 80 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 3 parts of flatting agent and 30 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 105 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 37 ℃.
In this example, the temperature was raised to 64℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 5600 rpm and the stirring time was 41min.
In this embodiment, the defoaming time in step E is 16min.
Example nine:
the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 80 parts of waterborne polyurethane acrylate, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 40 parts of water.
The preparation method of the embodiment comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 100 ℃ and minus 0.1MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
In this example, the temperature in step A was reduced to 36 ℃.
In this example, the temperature was raised to 63℃in step B, and the reaction was carried out for 9 hours.
In this example, the high-speed stirring rate in step D was 5500 rpm and the stirring time was 40min.
In this embodiment, the defoaming time in the step E is 10min-20min.
Performance test experiments
In order to examine the performance of the aqueous UV pressure-sensitive adhesive, the aqueous UV adhesive in the examples and the common UV pressure-sensitive adhesive are compared and examined in many aspects, and the results are as follows:
comparison of mechanical Properties
In the aspect of mechanical properties, the performance of the aqueous UV pressure-sensitive adhesive is obviously superior to that of common UV adhesive and conventional double-sided adhesive tapes, and the aqueous UV pressure-sensitive adhesive can provide reliable adhesion for backlight modules and replace the original double-sided adhesive tapes.
Other performance comparisons
The aqueous UV pressure-sensitive adhesive has more excellent optical performance and stable storage performance for optical performance and storage stability, is more beneficial to the light emission of the backlight module, and is suitable for industrial popularization.
In summary, the aqueous UV pressure-sensitive adhesive prepared by the invention combines the advantages of aqueous dispersion and UV curing, does not contain low molecular weight monomers, has viscosity and elasticity obtained by designing and synthesizing a PUA structure, is convenient for sizing by aqueous dispersion, can be directly formed into a pressure-sensitive adhesive strip with initial adhesion after dispensing, and is crosslinked by UV curing, so that the peel strength and high temperature resistance of the pressure-sensitive adhesive are greatly improved, the surface dryness is excellent, and the oxygen-free air polymerization phenomenon is avoided; compared with the adhesive double-sided tape, the automatic degree of the production line can be improved through the aqueous UV adhesive, the yield and the yield are improved, the labor cost is reduced, and the VOC emission is generated because the aqueous UV adhesive does not contain organic solvent for volatilization in the production and use processes, so that the carbon emission of the product can be reduced, and the adhesive double-sided tape is more environment-friendly and energy-saving.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a waterborne UV solidification pressure sensitive adhesive for display device backlight unit which characterized in that: the aqueous UV pressure-sensitive adhesive mainly comprises the following components in parts by weight: 70-90 parts of aqueous polyurethane acrylic ester, 2-5 parts of photoinitiator, 1-3 parts of defoamer, 1-3 parts of flatting agent and 20-40 parts of water.
2. The aqueous UV curable pressure sensitive adhesive for a backlight module of a display device according to claim 1, wherein: the preferable parts by weight of the aqueous UV pressure-sensitive adhesive comprise 80 parts of aqueous polyurethane acrylic acid, 3 parts of photoinitiator, 1 part of defoamer, 1 part of flatting agent and 40 parts of water.
3. The method for preparing the water-based UV curing pressure-sensitive adhesive for the backlight module of the display device, which is realized in the following steps: the preparation method comprises the following steps:
A. adding polyether polyol with high primary hydroxyl content into a 500ML round bottom flask according to equivalent weight, vacuumizing for 4 hours at 90-120 ℃ and-0.1 MPa, and reducing the temperature until the water content is reduced to below 0.05%;
B. after the temperature is reduced, adding calculated amount of 2, 2-dimethylolpropionic acid, isocyanate and catalyst into the mixture to react, and gradually heating the mixture to synthesize isocyanate-terminated prepolymer; adding calculated amount of hydroxyethyl acrylate and lauryl alcohol into the prepolymer to react to end-cap isocyanate, so that the aqueous polyurethane acrylic acid contains difunctional components and monofunctional components;
C. emulsifying and dispersing the synthesized aqueous polyurethane acrylic acid with water, adding dibenzoyl peroxide for uniform dispersion, and thermally initiating a free radical reaction to graft the monofunctional aqueous polyurethane acrylic acid into the difunctional aqueous polyurethane acrylic acid;
D. adding a photoinitiator, a defoaming agent and a leveling agent into the slightly crosslinked prepolymer, and stirring uniformly at a high speed to obtain a water-based UV curing pressure-sensitive adhesive;
E. and (3) the obtained aqueous UV pressure-sensitive adhesive is defoamed and then transferred into a black syringe or a pot for storage in shade.
4. The method for preparing the aqueous UV-curable pressure-sensitive adhesive for a backlight module of a display device according to claim 3, wherein the method comprises the following steps: and (C) cooling to 35-38 ℃ in the step (A).
5. The method for preparing the aqueous UV-curable pressure-sensitive adhesive for a backlight module of a display device according to claim 3, wherein the method comprises the following steps: and in the step B, the temperature is increased to 60-65 ℃ and the reaction is carried out for 8-9 h.
6. The method for preparing the aqueous UV-curable pressure-sensitive adhesive for a backlight module of a display device according to claim 3, wherein the method comprises the following steps: and D, the high-speed stirring speed in the step is 5000-6000 rpm, and the stirring time is 30-50 min.
7. The method for preparing the aqueous UV-curable pressure-sensitive adhesive for a backlight module of a display device according to claim 3, wherein the method comprises the following steps: and E, defoaming for 10-20 min.
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| CN202311656195.0A CN117487504A (en) | 2023-12-04 | 2023-12-04 | Water-based UV curing pressure-sensitive adhesive for display device backlight module and preparation method thereof |
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