WO2022224083A1 - Multilayer structure adhesive tape and preparation method therefor - Google Patents
Multilayer structure adhesive tape and preparation method therefor Download PDFInfo
- Publication number
- WO2022224083A1 WO2022224083A1 PCT/IB2022/053445 IB2022053445W WO2022224083A1 WO 2022224083 A1 WO2022224083 A1 WO 2022224083A1 IB 2022053445 W IB2022053445 W IB 2022053445W WO 2022224083 A1 WO2022224083 A1 WO 2022224083A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive tape
- layer
- adhesive
- multilayer structure
- antistatic
- Prior art date
Links
- 239000002390 adhesive tape Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 58
- 239000012790 adhesive layer Substances 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000002079 double walled nanotube Substances 0.000 claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002109 single walled nanotube Substances 0.000 claims abstract description 17
- 239000006185 dispersion Substances 0.000 claims description 22
- 239000000853 adhesive Substances 0.000 claims description 21
- 230000001070 adhesive effect Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 16
- 229920002635 polyurethane Polymers 0.000 claims description 12
- 239000004814 polyurethane Substances 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 239000004014 plasticizer Substances 0.000 claims description 5
- 238000011417 postcuring Methods 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 30
- 239000002041 carbon nanotube Substances 0.000 abstract description 22
- 229910021393 carbon nanotube Inorganic materials 0.000 abstract description 22
- 230000003287 optical effect Effects 0.000 abstract description 17
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 25
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 8
- 239000002608 ionic liquid Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 239000002086 nanomaterial Substances 0.000 description 7
- 229920001940 conductive polymer Polymers 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000002048 multi walled nanotube Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000000643 oven drying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/041—Carbon nanotubes
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/41—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the carrier layer
-
- 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
- C09J2475/00—Presence of polyurethane
Definitions
- the present invention relates to an antistatic device. More particularly, the present invention relates to a multilayer structure adhesive tape having a carbon nanotube antistatic layer, and a preparation method therefor.
- Optical films with antistatic layers are widely applied to, for example, surfaces of electronic equipment and electronic apparatuses, such as surfaces of OLED liquid crystal displays, to protect the surfaces of electronic equipment during processing and to prevent damage to electronic circuits due to static electricity. It is generally desirable for such optical films to have both outstanding antistatic performance and optical performance (at least excellent optical transparency) without deterioration over time due to conditions such as ultraviolet exposure, oxidation, humidity or high temperature.
- ionic liquid materials are colorless, and therefore have good optical transparency and relatively stable performance that do not easily deteriorate.
- carriers of ionic liquids are ions, and thus it is rather difficult to achieve high conductivity or low surface resistance, but a sufficient antistatic effect cannot be provided if surface resistance is relatively high.
- a conductive polymer has p electrons as carriers, and the conductivity depends on the conjugated structure of the polymer.
- conductive polymers can exhibit lower surface resistance and higher conductivity, and thus provide excellent antistatic ability.
- ionic liquids with a mass concentration of up to 1% can usually only achieve surface resistance of 10 L 9 ohm/sq, while conductive polymers can usually achieve surface resistance of 10 L 3 ohm/sq.
- conductive polymers are relatively sensitive to ultraviolet light, oxygen or high temperature, and their physicochemical properties easily deteriorate.
- carbon nanomaterials e.g., carbon nanotubes, and graphene
- carbon nanomaterials combine the advantages of the above two materials, that is, they have outstanding conductivity and stable physicochemical properties based on the conjugated structure. Therefore, carbon nanomaterials are naturally one of the ideal choices for eliminating static electricity.
- the challenges of using carbon nanomaterials in applications such as OLED liquid crystal displays mainly lie in how to uniformly disperse carbon nanomaterials in a certain solvent, how to apply a coating uniformly, and how to minimize the impact of the dark color of the carbon nanomaterials themselves on the optical performance.
- the present invention aims to overcome the challenges existing in the prior art, by applying a carbon nanomaterial to an antistatic optical fdm on the surface of electronic equipment.
- a multilayer structure adhesive tape comprising an adhesive tape substrate layer, and an antistatic layer and an adhesive layer located on opposite sides of the adhesive tape substrate layer, where the antistatic layer comprises single-walled or double-walled carbon nanotubes.
- Carbon nanotubes have low surface resistance and stable physicochemical properties, resulting in excellent and stable antistatic ability. Furthermore, unlike multi-walled carbon nanotubes, single-walled or double-walled carbon nanotubes can minimize the impact of the color of the carbon nanotubes themselves on the optical performance of the multilayer structure adhesive tape while ensuring excellent antistatic ability.
- the antistatic layer is formed by applying an aqueous dispersion solution comprising single-walled or double-walled carbon nanotubes and a water-soluble or water-dispersible binder onto one side of the adhesive tape substrate layer and drying.
- the water-soluble or water-dispersible binder facilitates uniform dispersion of the carbon nanotubes in the aqueous dispersion solution.
- a thickness of the antistatic layer is less than 80 nm, to ensure excellent optical performance.
- the adhesive layer comprises a polyurethane adhesive.
- a peeling force of the adhesive layer is less than 15 g/inch.
- a lower peeling force can protect the surface to which the multilayer structure adhesive tape is adhered (e.g., the surface of an OLED liquid crystal display), and protect the multilayer structure adhesive tape itself from being damaged during peeling.
- the adhesive layer comprises a plasticizer.
- the addition of the plasticizer can further reduce the peeling force of the adhesive layer, to achieve the desired viscosity.
- the multilayer structure adhesive tape further comprises a release fdm covering the adhesive layer, to protect the adhesive layer prior to use.
- a method for preparing a multilayer structure adhesive tape comprising an adhesive tape substrate layer.
- the method comprises: preparing an adhesive solution; preparing an aqueous dispersion solution comprising single-walled or double-walled carbon nanotubes; applying the aqueous dispersion solution onto one side of the adhesive tape substrate layer and drying to form an antistatic layer; applying the adhesive solution onto the other side of the adhesive tape substrate layer, drying and curing to form an adhesive layer; and subjecting the adhesive layer to post-curing treatment.
- the aqueous dispersion solution comprises a water-soluble or water-dispersible binder.
- the antistatic layer is formed to have a thickness of less than 80 nm.
- the adhesive layer is formed by using a polyurethane adhesive.
- the adhesive layer is formed to have a peeling force of less than 15 g/inch.
- lamination of a release fdm on the adhesive layer is further comprised.
- the present invention achieves a multilayer structure adhesive tape having both excellent antistatic ability and optical performance, and has stable performance and does not easily deteriorate, by forming an antistatic layer comprising single-walled or double-walled carbon nanotubes, and obtains performance superior to traditional ionic liquid antistatic layers and conductive polymer antistatic layers.
- the antistatic layer via the method of application of an aqueous dispersion solution, the carbon nanotubes can be uniformly dispersed and applied, thereby forming a uniform antistatic layer.
- FIG. 1 shows a schematic cross-sectional view of a multilayer structure adhesive tape according to the present invention.
- FIG. 2 shows a schematic cross-sectional view of a multilayer structure adhesive tape having a release film according to the present invention.
- FIG. 3 shows a schematic flow diagram of a method for preparing a multilayer structure adhesive tape according to the present invention.
- performance indicators such as “optical transparency,” “haze,” “peeling force” and “surface resistance” described herein conform to the general definitions in the art and can be measured by the testing techniques commonly used in the art.
- FIG. 1 shows a schematic cross-sectional view of a multilayer structure adhesive tape according to the present invention.
- the multilayer structure adhesive tape 1 comprises an adhesive tape substrate layer 10, and an antistatic layer 20 and an adhesive layer 30 located respectively on opposite sides of the adhesive tape substrate layer 10.
- the adhesive tape substrate layer 10 may be a PET film or any other suitable optical film, with a thickness of typically 50-75 pm;
- the antistatic layer 20 is a coating formed by applying an aqueous solution comprising single-walled or double-walled carbon nanotubes; and the adhesive layer 30 is used to adhere to surfaces of electronic equipment, such as surfaces of OLED liquid crystal displays.
- the antistatic layer 20 comprises single-walled or double-walled carbon nanotubes.
- the single-walled or double-walled structure avoids the adverse impact the dark color of multi-walled carbon nanotubes can have on the color, transparency, and other optical performance of the adhesive tape.
- the single-walled carbon nanotubes may be JCST-75-1.5-20 produced by Nanjing Jicang Nanotechnology Co., Ltd., with an average length of about 75 nm and an average diameter of about 1.5 nm; and double-walled carbon nanotubes may be JCST-60-3-50 produced by Nanjing Jicang Nanotechnology Co., Ltd., with an average length of about 60 nm and an average diameter of about 3 nm.
- the antistatic layer 20 further comprises a water-soluble or water-dispersible binder, for example, the DSM986 binder produced by DSM Company, to uniformly disperse the carbon nanotubes in the aqueous solution and uniformly apply the carbon nanotubes during the process of forming the antistatic layer 20.
- a water-soluble or water-dispersible binder for example, the DSM986 binder produced by DSM Company
- a premix of commercially available carbon nanotubes and a binder such as JCGMT-999-11-30-COOH produced by Nanjing Jicang Nanotechnology Co., Ltd., may also be used directly.
- a thickness of the antistatic layer 20 is preferably less than 80 nm, to ensure good optical performance. The particular preparation process is described below in detail.
- the adhesive layer 30 preferably adopts a low-viscosity adhesive, such as a polyurethane adhesive, so as to avoid damage to the OLED liquid crystal display and the multilayer structure adhesive tape 1 during the process of peeling the multilayer structure adhesive tape 1 from the OLED liquid crystal display.
- a preferred viscosity is a viscosity having a peeling force less than 15 g/inch.
- Commercially available polyurethane adhesives include, for example, CYABINE SP205 produced by Toyo Ink Company and PA-67-2 produced by Xinzong Chemical Company, etc.
- the polyurethane adhesive is mixed with a suitable crosslinker and an organic solvent, so as to be applied onto one side of the adhesive tape substrate layer 10.
- the adhesive layer 30 further comprises an antistatic ionic liquid, for example, a product HQ115 from 3M Company, to provide the adhesive layer 30 with a certain antistatic function.
- the adhesive layer 30 may further comprise a plasticizer or the like to further reduce the viscosity.
- the outer surface of the adhesive layer 30 may also be covered with a peelable release film 40, to protect the adhesive layer 30 prior to use.
- the release film 40 may also be made of a PET film.
- an adhesive solution is prepared.
- a polyurethane adhesive e.g., methyl ethyl ketone
- an antistatic ionic liquid e.g., methyl ethyl ketone
- a suitable plasticizer may be added depending on the desired target viscosity.
- a preferred viscosity is a viscosity having a peeling force less than 15 g/inch.
- an aqueous dispersion solution of single-walled or double-walled carbon nanotubes is prepared.
- the single-walled or double-walled carbon nanotubes and the water-soluble or water-dispersible binder are mixed and dispersed in deionized water in an appropriate proportion, to form an aqueous dispersion solution.
- the mass concentration of the aqueous dispersion solution is, for example, about 1%.
- An appropriate amount of carboxyl groups or similar functional groups may be added to the carbon nanotube aqueous dispersion solution, so as to improve the hydrophilicity of the carbon nanotubes and make it easier for the carbon nanotubes to disperse uniformly in the aqueous solution.
- the antistatic layer 20 is formed by the aqueous dispersion solution of single-walled or double-walled carbon nanotubes prepared in Step S2.
- the carbon nanotube aqueous dispersion solution is uniformly applied onto one side of the adhesive tape substrate layer 10 by a mesh roller, and the carbon nanotube aqueous dispersion solution is dried by natural air drying or oven-drying in an oven, to form the antistatic layer 20.
- the thickness of the coating after drying is calculated by the weight and mass concentration of the applied carbon nanotube aqueous dispersion solution is preferably less than 80 nm, to ensure good optical performance.
- the temperature and time of natural air drying or oven-drying depend on the weight and mass concentration of the applied carbon nanotube aqueous dispersion solution. For example, in this embodiment, the coating is heated in an oven at a temperature of 100°C for 5 min, to form the antistatic layer 20.
- the adhesive layer 30 is formed by the adhesive solution prepared in Step S 1.
- the polyurethane adhesive solution is uniformly applied to the other side of the adhesive tape substrate layer 10 to form a coating with a thickness of about 20-25 pm, and the adhesive tape substrate layer 10 carrying the coating is heated in an oven, to dry the polyurethane adhesive solution and cure the polyurethane adhesive.
- the drying and curing time and temperature depend on the composition and coating thickness of the polyurethane adhesive solution, for example, in this embodiment, the adhesive layer 30 is heated in an oven at a temperature of 100°C for 10 min.
- Step S5 the PET release film 40 is laminated on the formed adhesive layer 30.
- a thickness of the release film 40 may generally be about 50 pm.
- Step S6 post-curing treatment is performed.
- the multilayer structure adhesive tape 1 formed by the above steps is kept in an oven at 60°C for 2 days, to complete the post-curing of the adhesive layer 30.
- the time and temperature of the post-curing treatment can be adaptively adjusted according to the composition and thickness of the adhesive layer 30.
- Steps SI and S2 of pre-preparing the adhesive solution or the carbon nanotube aqueous dispersion solution can obviously be performed in an interchanged order or simultaneously, and Steps S3 and S4 of forming the antistatic layer 20 and the adhesive layer 30 respectively by coating and drying can also be interchanged in the order.
- the multilayer structure adhesive tape 1 having excellent optical transparency, excellent and stable antistatic performance and low viscosity can be formed.
- the use of single-walled or double-walled carbon nanotubes instead of multi-walled carbon nanotubes can provide the antistatic layer 20 with a clear and only slightly black appearance, as well as excellent optical transparency and haze.
- the optical transparency can reach 86% or higher and the haze may be less than 4.5%.
- the antistatic layer 20 containing single-walled or double-walled carbon nanotubes can achieve a surface resistance of the order of 10 L 6 ohm/sq, and can still maintain a surface resistance of the order of 10 L 6 ohm/sq after long-term exposure to ultraviolet light, which means that the antistatic layer 20 has excellent antistatic performance that does not easily deteriorate.
- Dispersing carbon nanotubes in an aqueous solution via a water-soluble or water-dispersible binder can form a uniform carbon nanotube aqueous dispersion solution, thereby facilitating the uniform application of carbon nanotubes onto the adhesive tape substrate layer 10.
- Using a low-viscosity adhesive to form the adhesive layer 30 having a peeling force of less than 15 g/inch can protect the OLED liquid crystal display and the multilayer structure adhesive tape 1 from being damaged during the peeling process.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
Abstract
The present invention relates to a multilayer structure adhesive tape having a carbon nanotube antistatic layer, and a preparation method therefor. The multilayer structure adhesive tape comprises an adhesive tape substrate layer, and an antistatic layer and an adhesive layer located on opposite sides of the adhesive tape substrate layer, wherein the antistatic layer comprises single-walled or double-walled carbon nanotubes. The multilayer structure adhesive tape has excellent antistatic ability and optical performance, and the antistatic ability does not easily deteriorate over time due to conditions such as ultraviolet exposure, oxidation, humidity or high temperature.
Description
MULTILAYER STRUCTURE ADHESIVE TAPE AND PREPARATION METHOD
THEREFOR
Technical Field
The present invention relates to an antistatic device. More particularly, the present invention relates to a multilayer structure adhesive tape having a carbon nanotube antistatic layer, and a preparation method therefor.
Background
Optical films with antistatic layers are widely applied to, for example, surfaces of electronic equipment and electronic apparatuses, such as surfaces of OLED liquid crystal displays, to protect the surfaces of electronic equipment during processing and to prevent damage to electronic circuits due to static electricity. It is generally desirable for such optical films to have both outstanding antistatic performance and optical performance (at least excellent optical transparency) without deterioration over time due to conditions such as ultraviolet exposure, oxidation, humidity or high temperature.
At present, two types of traditional coatings are typically used to impart antistatic performance to the film surfaces. One type is coatings based on ionic liquid materials, and the other is coatings based on a conductive polymers. Each of these two coatings has advantages and limitations. Most of ionic liquids are colorless, and therefore have good optical transparency and relatively stable performance that do not easily deteriorate. However, carriers of ionic liquids are ions, and thus it is rather difficult to achieve high conductivity or low surface resistance, but a sufficient antistatic effect cannot be provided if surface resistance is relatively high. A conductive polymer has p electrons as carriers, and the conductivity depends on the conjugated structure of the polymer. Therefore, compared with ionic liquids, conductive polymers can exhibit lower surface resistance and higher conductivity, and thus provide excellent antistatic ability. For comparison, ionic liquids
with a mass concentration of up to 1% can usually only achieve surface resistance of 10L9 ohm/sq, while conductive polymers can usually achieve surface resistance of 10L3 ohm/sq. However, conductive polymers are relatively sensitive to ultraviolet light, oxygen or high temperature, and their physicochemical properties easily deteriorate.
In contrast, carbon nanomaterials (e.g., carbon nanotubes, and graphene) combine the advantages of the above two materials, that is, they have outstanding conductivity and stable physicochemical properties based on the conjugated structure. Therefore, carbon nanomaterials are naturally one of the ideal choices for eliminating static electricity. At present, the challenges of using carbon nanomaterials in applications such as OLED liquid crystal displays mainly lie in how to uniformly disperse carbon nanomaterials in a certain solvent, how to apply a coating uniformly, and how to minimize the impact of the dark color of the carbon nanomaterials themselves on the optical performance. The present invention aims to overcome the challenges existing in the prior art, by applying a carbon nanomaterial to an antistatic optical fdm on the surface of electronic equipment.
Summary
An object of the present invention is to provide a multilayer structure adhesive tape having both excellent antistatic ability and optical performance, which has stable performance and does not easily deteriorate. Another objective of the present invention is to overcome the above challenges in the application of carbon nanomaterials to antistatic optical films, in the prior art.
According to one aspect of the present invention, a multilayer structure adhesive tape is provided, the adhesive tape comprising an adhesive tape substrate layer, and an antistatic layer and an adhesive layer located on opposite sides of the adhesive tape substrate layer, where the antistatic layer comprises single-walled or double-walled carbon nanotubes.
Carbon nanotubes have low surface resistance and stable physicochemical properties, resulting in excellent and stable antistatic ability. Furthermore, unlike
multi-walled carbon nanotubes, single-walled or double-walled carbon nanotubes can minimize the impact of the color of the carbon nanotubes themselves on the optical performance of the multilayer structure adhesive tape while ensuring excellent antistatic ability.
In one embodiment, the antistatic layer is formed by applying an aqueous dispersion solution comprising single-walled or double-walled carbon nanotubes and a water-soluble or water-dispersible binder onto one side of the adhesive tape substrate layer and drying. The water-soluble or water-dispersible binder facilitates uniform dispersion of the carbon nanotubes in the aqueous dispersion solution.
In one embodiment, a thickness of the antistatic layer is less than 80 nm, to ensure excellent optical performance.
In one embodiment, the adhesive layer comprises a polyurethane adhesive.
In one embodiment, a peeling force of the adhesive layer is less than 15 g/inch. A lower peeling force can protect the surface to which the multilayer structure adhesive tape is adhered (e.g., the surface of an OLED liquid crystal display), and protect the multilayer structure adhesive tape itself from being damaged during peeling.
In one embodiment, the adhesive layer comprises a plasticizer. The addition of the plasticizer can further reduce the peeling force of the adhesive layer, to achieve the desired viscosity.
In one embodiment, the multilayer structure adhesive tape further comprises a release fdm covering the adhesive layer, to protect the adhesive layer prior to use.
According to another aspect of the present invention, a method for preparing a multilayer structure adhesive tape comprising an adhesive tape substrate layer, is provided. The method comprises: preparing an adhesive solution; preparing an aqueous dispersion solution comprising single-walled or double-walled carbon nanotubes; applying the aqueous dispersion solution onto one side of the adhesive tape substrate layer and drying to form an antistatic layer; applying the adhesive solution onto the other side of the adhesive
tape substrate layer, drying and curing to form an adhesive layer; and subjecting the adhesive layer to post-curing treatment.
In one embodiment, the aqueous dispersion solution comprises a water-soluble or water-dispersible binder.
In one embodiment, the antistatic layer is formed to have a thickness of less than 80 nm.
In one embodiment, the adhesive layer is formed by using a polyurethane adhesive.
In one embodiment, the adhesive layer is formed to have a peeling force of less than 15 g/inch.
In one embodiment, lamination of a release fdm on the adhesive layer is further comprised.
As mentioned above, the present invention achieves a multilayer structure adhesive tape having both excellent antistatic ability and optical performance, and has stable performance and does not easily deteriorate, by forming an antistatic layer comprising single-walled or double-walled carbon nanotubes, and obtains performance superior to traditional ionic liquid antistatic layers and conductive polymer antistatic layers. In addition, in the present invention, by forming the antistatic layer via the method of application of an aqueous dispersion solution, the carbon nanotubes can be uniformly dispersed and applied, thereby forming a uniform antistatic layer.
Brief Description of the Drawings
Embodiments of the present invention are described below, by way of examples only, with reference to the accompanying drawings. In the drawings, the same features or members are designated by the same reference numbers, and the figures are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 shows a schematic cross-sectional view of a multilayer structure adhesive tape according to the present invention.
FIG. 2 shows a schematic cross-sectional view of a multilayer structure adhesive tape having a release film according to the present invention.
FIG. 3 shows a schematic flow diagram of a method for preparing a multilayer structure adhesive tape according to the present invention.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the invention and its applications and uses. It should be understood that, similar reference numbers refer to the same or similar parts and features throughout the drawings. The accompanying drawings illustratively show the idea and principles of the embodiments of the present invention, but do not necessarily show specific size of each embodiment of the present invention and the scale thereof. In specific parts of specific accompanying drawings, related details or structures of the embodiments of the present invention may be illustrated in an exaggerated manner.
In the description of the various embodiments of the present invention, the orientation terms used in relation to “upper,” “lower,” “left” and “right” are described using upper, lower, left and right positions of the views shown in the accompanying drawings. In the actual application process, the positional relationship of “upper,” “lower,” “left” and “right” used can be defined according to the actual situation, and such relationships can be reversed.
The performance indicators such as “optical transparency,” “haze,” “peeling force” and “surface resistance” described herein conform to the general definitions in the art and can be measured by the testing techniques commonly used in the art.
FIG. 1 shows a schematic cross-sectional view of a multilayer structure adhesive tape according to the present invention. According to FIG. 1, the multilayer structure adhesive tape 1 comprises an adhesive tape substrate layer 10, and an antistatic layer 20 and an adhesive layer 30 located respectively on opposite sides of the adhesive tape substrate layer 10. Where, the adhesive tape substrate layer 10 may be a PET film or any other
suitable optical film, with a thickness of typically 50-75 pm; the antistatic layer 20 is a coating formed by applying an aqueous solution comprising single-walled or double-walled carbon nanotubes; and the adhesive layer 30 is used to adhere to surfaces of electronic equipment, such as surfaces of OLED liquid crystal displays.
The antistatic layer 20 comprises single-walled or double-walled carbon nanotubes. The single-walled or double-walled structure avoids the adverse impact the dark color of multi-walled carbon nanotubes can have on the color, transparency, and other optical performance of the adhesive tape. Exemplarily and non-restrictively, the single-walled carbon nanotubes may be JCST-75-1.5-20 produced by Nanjing Jicang Nanotechnology Co., Ltd., with an average length of about 75 nm and an average diameter of about 1.5 nm; and double-walled carbon nanotubes may be JCST-60-3-50 produced by Nanjing Jicang Nanotechnology Co., Ltd., with an average length of about 60 nm and an average diameter of about 3 nm. The antistatic layer 20 further comprises a water-soluble or water-dispersible binder, for example, the DSM986 binder produced by DSM Company, to uniformly disperse the carbon nanotubes in the aqueous solution and uniformly apply the carbon nanotubes during the process of forming the antistatic layer 20. A premix of commercially available carbon nanotubes and a binder, such as JCGMT-999-11-30-COOH produced by Nanjing Jicang Nanotechnology Co., Ltd., may also be used directly. A thickness of the antistatic layer 20 is preferably less than 80 nm, to ensure good optical performance. The particular preparation process is described below in detail.
The adhesive layer 30 preferably adopts a low-viscosity adhesive, such as a polyurethane adhesive, so as to avoid damage to the OLED liquid crystal display and the multilayer structure adhesive tape 1 during the process of peeling the multilayer structure adhesive tape 1 from the OLED liquid crystal display. A preferred viscosity is a viscosity having a peeling force less than 15 g/inch. Commercially available polyurethane adhesives include, for example, CYABINE SP205 produced by Toyo Ink Company and PA-67-2 produced by Xinzong Chemical Company, etc. The polyurethane adhesive is mixed with a
suitable crosslinker and an organic solvent, so as to be applied onto one side of the adhesive tape substrate layer 10. The adhesive layer 30 further comprises an antistatic ionic liquid, for example, a product HQ115 from 3M Company, to provide the adhesive layer 30 with a certain antistatic function. Optionally, the adhesive layer 30 may further comprise a plasticizer or the like to further reduce the viscosity.
As shown in FIG. 2, in other embodiments, the outer surface of the adhesive layer 30 may also be covered with a peelable release film 40, to protect the adhesive layer 30 prior to use. The release film 40 may also be made of a PET film.
Next, the preparation method for the multilayer structure adhesive tape 1 is described in detail with reference to FIG. 3.
In Step SI, an adhesive solution is prepared. In this embodiment, a polyurethane adhesive, an organic solvent (e.g., methyl ethyl ketone), and an antistatic ionic liquid are mixed in an appropriate proportion. Optionally, a suitable plasticizer may be added depending on the desired target viscosity. Where, a preferred viscosity is a viscosity having a peeling force less than 15 g/inch.
In Step S2, an aqueous dispersion solution of single-walled or double-walled carbon nanotubes is prepared. The single-walled or double-walled carbon nanotubes and the water-soluble or water-dispersible binder are mixed and dispersed in deionized water in an appropriate proportion, to form an aqueous dispersion solution. The mass concentration of the aqueous dispersion solution is, for example, about 1%. An appropriate amount of carboxyl groups or similar functional groups may be added to the carbon nanotube aqueous dispersion solution, so as to improve the hydrophilicity of the carbon nanotubes and make it easier for the carbon nanotubes to disperse uniformly in the aqueous solution.
In Step S3, the antistatic layer 20 is formed by the aqueous dispersion solution of single-walled or double-walled carbon nanotubes prepared in Step S2. The carbon nanotube aqueous dispersion solution is uniformly applied onto one side of the adhesive tape substrate layer 10 by a mesh roller, and the carbon nanotube aqueous dispersion solution is
dried by natural air drying or oven-drying in an oven, to form the antistatic layer 20. The thickness of the coating after drying is calculated by the weight and mass concentration of the applied carbon nanotube aqueous dispersion solution is preferably less than 80 nm, to ensure good optical performance. The temperature and time of natural air drying or oven-drying depend on the weight and mass concentration of the applied carbon nanotube aqueous dispersion solution. For example, in this embodiment, the coating is heated in an oven at a temperature of 100°C for 5 min, to form the antistatic layer 20.
In Step S4, the adhesive layer 30 is formed by the adhesive solution prepared in Step S 1. The polyurethane adhesive solution is uniformly applied to the other side of the adhesive tape substrate layer 10 to form a coating with a thickness of about 20-25 pm, and the adhesive tape substrate layer 10 carrying the coating is heated in an oven, to dry the polyurethane adhesive solution and cure the polyurethane adhesive. The drying and curing time and temperature depend on the composition and coating thickness of the polyurethane adhesive solution, for example, in this embodiment, the adhesive layer 30 is heated in an oven at a temperature of 100°C for 10 min.
Optionally, in Step S5, the PET release film 40 is laminated on the formed adhesive layer 30. A thickness of the release film 40 may generally be about 50 pm.
In Step S6, post-curing treatment is performed. In this embodiment, the multilayer structure adhesive tape 1 formed by the above steps is kept in an oven at 60°C for 2 days, to complete the post-curing of the adhesive layer 30. The time and temperature of the post-curing treatment can be adaptively adjusted according to the composition and thickness of the adhesive layer 30.
The orders of some of the above steps may be interchanged if the order of operations is not expressly or implicitly stated. For example, Steps SI and S2 of pre-preparing the adhesive solution or the carbon nanotube aqueous dispersion solution can obviously be performed in an interchanged order or simultaneously, and Steps S3 and S4 of forming the
antistatic layer 20 and the adhesive layer 30 respectively by coating and drying can also be interchanged in the order.
Via the above preparation method, the multilayer structure adhesive tape 1 having excellent optical transparency, excellent and stable antistatic performance and low viscosity can be formed. The use of single-walled or double-walled carbon nanotubes instead of multi-walled carbon nanotubes can provide the antistatic layer 20 with a clear and only slightly black appearance, as well as excellent optical transparency and haze. For example, the optical transparency can reach 86% or higher and the haze may be less than 4.5%. Meanwhile, the antistatic layer 20 containing single-walled or double-walled carbon nanotubes can achieve a surface resistance of the order of 10L6 ohm/sq, and can still maintain a surface resistance of the order of 10L6 ohm/sq after long-term exposure to ultraviolet light, which means that the antistatic layer 20 has excellent antistatic performance that does not easily deteriorate. Dispersing carbon nanotubes in an aqueous solution via a water-soluble or water-dispersible binder can form a uniform carbon nanotube aqueous dispersion solution, thereby facilitating the uniform application of carbon nanotubes onto the adhesive tape substrate layer 10. Using a low-viscosity adhesive to form the adhesive layer 30 having a peeling force of less than 15 g/inch can protect the OLED liquid crystal display and the multilayer structure adhesive tape 1 from being damaged during the peeling process.
The exemplary embodiments of the multilayer structure adhesive tape having a carbon nanotube antistatic layer and a preparation method therefor according to the present invention have been described in detail above, but it should be understood that, the present invention is not limited to the particular embodiments described and shown in detail above. Those skilled in the art can make various variations and variants for the present invention without departing from the gist and scope of the present invention. All these variations and variants fall within the scope of the present invention. In addition, all members described here can be replaced with other technically equivalent members.
Claims
1. A multilayer structure adhesive tape, comprising an adhesive tape substrate layer, and an antistatic layer and an adhesive layer located on opposite sides of the adhesive tape substrate layer, wherein the antistatic layer comprises single-walled or double-walled carbon nanotubes.
2. The multilayer structure adhesive tape according to claim 1, wherein the antistatic layer is formed by applying an aqueous dispersion solution comprising the single-walled or double-walled carbon nanotubes and a water-soluble or water-dispersible binder onto one side of the adhesive tape substrate layer and drying.
3. The multilayer structure adhesive tape according to claim 1, wherein a thickness of the antistatic layer is less than 80 nm.
4. The multilayer structure adhesive tape according to claim 1, wherein the adhesive layer comprises a polyurethane adhesive.
5. The multilayer structure adhesive tape according to claim 4, wherein a peeling force of the adhesive layer is less than 15 g/inch.
6. The multilayer structure adhesive tape according to claim 4, wherein the adhesive layer comprises a plasticizer.
7. The multilayer structure adhesive tape according to claim 1, further comprising a release fdm covering the adhesive layer.
8. A method for preparing a multilayer structure adhesive tape, the multilayer structure adhesive tape comprising an adhesive tape substrate layer, wherein the method comprises: preparing an adhesive solution; preparing an aqueous dispersion solution comprising single-walled or double-walled carbon nanotubes; applying the aqueous dispersion solution onto one side of the adhesive tape substrate layer and drying to form an antistatic layer; applying the adhesive solution onto the other side of the adhesive tape substrate layer, drying and curing to form an adhesive layer; and subjecting the adhesive layer to post-curing treatment.
9. The method according to claim 8, wherein the aqueous dispersion solution comprises a water-soluble or water-dispersible binder.
10. The method according to claim 8, wherein the antistatic layer is formed to have a thickness of less than 80 nm.
11. The method according to claim 8, wherein the adhesive layer is formed by using a polyurethane adhesive.
12. The method according to claim 11, wherein the adhesive layer is formed to have a peeling force of less than 15 g/inch.
13. The method according to claim 8, further comprising laminating a release fdm on the adhesive layer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110436103.2A CN115232566A (en) | 2021-04-22 | 2021-04-22 | Multi-layer adhesive tape and preparation method thereof |
CN202110436103.2 | 2021-04-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022224083A1 true WO2022224083A1 (en) | 2022-10-27 |
Family
ID=81345953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2022/053445 WO2022224083A1 (en) | 2021-04-22 | 2022-04-12 | Multilayer structure adhesive tape and preparation method therefor |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN115232566A (en) |
WO (1) | WO2022224083A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180208801A1 (en) * | 2017-01-20 | 2018-07-26 | Polyonics, Inc. | Electrostatic dissipative surface coating and high temperature label employing same |
KR102071913B1 (en) * | 2016-05-31 | 2020-01-31 | 주식회사 엘지화학 | Optical Film |
WO2020153757A1 (en) * | 2019-01-25 | 2020-07-30 | 주식회사 엘지화학 | Surface protective film and method for manufacturing organic light-emitting electronic device by using same |
-
2021
- 2021-04-22 CN CN202110436103.2A patent/CN115232566A/en active Pending
-
2022
- 2022-04-12 WO PCT/IB2022/053445 patent/WO2022224083A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102071913B1 (en) * | 2016-05-31 | 2020-01-31 | 주식회사 엘지화학 | Optical Film |
US20180208801A1 (en) * | 2017-01-20 | 2018-07-26 | Polyonics, Inc. | Electrostatic dissipative surface coating and high temperature label employing same |
WO2020153757A1 (en) * | 2019-01-25 | 2020-07-30 | 주식회사 엘지화학 | Surface protective film and method for manufacturing organic light-emitting electronic device by using same |
Also Published As
Publication number | Publication date |
---|---|
CN115232566A (en) | 2022-10-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI446062B (en) | Transparent conductive films containing carbon nanotubes and the touch panel | |
JP5473148B2 (en) | Transparent conductive film with improved conductivity and method for producing the same | |
US8778116B2 (en) | Method for producing carbon nanotube-containing conductor | |
JP5573158B2 (en) | Flexible transparent conductive film and flexible functional element using the same | |
US8637122B2 (en) | Method of manufacturing transparent conductive film containing carbon nanotubes and binder, and transparent conductive film manufactured thereby | |
US20060054868A1 (en) | Coatings containing nanotubes, methods of applying the same and substrates incorporating the same | |
KR100869161B1 (en) | Polymer binder composition for transparent conductive films containing carbon nanotubes | |
CN104637570A (en) | Flexible transparent conductive thin film and preparation method thereof | |
JP2012140008A (en) | Release film having excellent static electricity proofness, and method of manufacturing same | |
JP2004526838A (en) | Carbon nanotube-containing coating | |
US9544999B2 (en) | Transparent electrodes and electronic devices including the same | |
Ramadhan et al. | Surface-functionalized silver nanowires on chitosan biopolymers for highly robust and stretchable transparent conducting films | |
WO2015075876A1 (en) | Transparent conductor and method for producing transparent conductor | |
US20110083886A1 (en) | Method of manufacturing electrode substrate | |
WO2022224083A1 (en) | Multilayer structure adhesive tape and preparation method therefor | |
JP2017117632A (en) | Ito conductive film and coating for forming the ito conductive film | |
KR100945208B1 (en) | Fabrication method of transparent heater containing carbon nanotubes and binders, and the transparent heater | |
KR20070105869A (en) | Anti-static hard coating film with high hardness and manufacturing method thereof | |
KR20080107688A (en) | Preparation of transparent conductive film composed of carbon nanotubes for display | |
TW202311465A (en) | Surface-protective film and optical component | |
JP4784550B2 (en) | Transparent conductive paint and transparent conductive film | |
JP6747545B1 (en) | Laminate | |
WO2016129270A1 (en) | Electrode, method for producing same, and touch panel and organic el lighting element each provided with said electrode | |
CN111830618A (en) | Laminate body | |
CN113136045A (en) | PET single-side antistatic film and processing method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22717925 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 22717925 Country of ref document: EP Kind code of ref document: A1 |