CN111777959A - Polyurethane foaming double-sided adhesive tape and preparation method thereof - Google Patents

Polyurethane foaming double-sided adhesive tape and preparation method thereof Download PDF

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CN111777959A
CN111777959A CN202010663110.1A CN202010663110A CN111777959A CN 111777959 A CN111777959 A CN 111777959A CN 202010663110 A CN202010663110 A CN 202010663110A CN 111777959 A CN111777959 A CN 111777959A
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sensitive adhesive
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adhesive layer
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CN111777959B (en
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方友
张元涛
梁书泉
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Zhongguancun Technology Leasing Co ltd
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Guangdong Hongqing Electronic Material Technology Co Ltd
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    • 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
    • C09J7/29—Laminated material
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    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
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    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/10—Homopolymers or copolymers of methacrylic acid esters
    • C09J133/12—Homopolymers or copolymers of methyl methacrylate
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    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
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    • C09J9/02—Electrically-conducting adhesives
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    • C09J2400/00—Presence of inorganic and organic materials
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    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
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    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/28—Presence of paper
    • C09J2400/283—Presence of paper in the substrate
    • C—CHEMISTRY; METALLURGY
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    • C09J2467/00—Presence of polyester
    • C09J2467/005—Presence of polyester in the release coating
    • C—CHEMISTRY; METALLURGY
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C09J2475/006—Presence of polyurethane in the substrate

Abstract

The invention relates to the technical field of electronic product processing, in particular to a polyurethane foaming double-sided adhesive and a preparation method thereof, wherein the polyurethane foaming double-sided adhesive comprises a conductive shielding adhesive layer, a polyurethane foaming layer, a PET (polyethylene terephthalate) base layer, an adhesive-release layer and a release layer which are sequentially compounded, the adhesive-release layer is made of an acrylic pressure-sensitive adhesive, and the acrylic pressure-sensitive adhesive comprises the following raw materials: acrylic pressure-sensitive adhesive, tackifying resin, curing agent, silane coupling agent, black paste and antioxidant. The polyurethane foaming double-sided adhesive tape disclosed by the invention is compounded with the non-setting adhesive layer on one surface of the PET base layer, and the non-setting adhesive layer prepared from the specific raw materials of the acrylic pressure-sensitive adhesive according to a specific dosage has excellent bonding performance, high stripping force and excellent static shearing property on low-surface-energy materials, particularly display screens; the polyurethane foaming layer provides good buffering performance and sealing performance for the polyurethane foaming double-sided adhesive tape.

Description

Polyurethane foaming double-sided adhesive tape and preparation method thereof
Technical Field
The invention relates to the technical field of electronic product processing, in particular to a polyurethane foaming double-sided adhesive tape and a preparation method thereof.
Background
The traditional foam adhesive tape mainly comprises a Polyethylene (PE) foam adhesive tape, a Polyurethane (PU) foam adhesive tape and a vinyl acetate (EVA) foam adhesive tape, and the product is widely applied to the digital electronic industry, the automobile industry, the household appliance industry, the building elevator industry and various audio-visual equipment toys, and has good sealing property, shock absorption property, compression resistance, rebound resistance and conformability. At present, the size of a television display screen is larger and larger, the screen is gradually frameless, and the display screen is fixedly adhered by the adhesive force and the static shearing force of an adhesive tape. The requirements for the performance of adhesive tapes in the TV industry are also increasing, and not only high strength adhesive properties but also outstanding static shear properties are required.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the polyurethane foaming double-sided adhesive tape which has high peeling force, excellent static shear performance and excellent adhesion performance to low-surface-energy materials.
The invention also aims to provide a preparation method of the polyurethane foaming double-sided adhesive tape, which has the advantages of simple operation, convenient control, high production efficiency and low production cost and can be used for large-scale production.
The purpose of the invention is realized by the following technical scheme: the utility model provides a polyurethane foaming double faced adhesive tape, is including the electrically conductive shielding glue film, polyurethane foaming layer, PET basic unit, not dry adhesive layer and the release layer of complex in proper order, not dry adhesive layer is made by acrylic acid pressure sensitive adhesive, acrylic acid pressure sensitive adhesive includes the raw materials of following parts by weight:
Figure BDA0002579346390000011
Figure BDA0002579346390000021
the polyurethane foaming double-sided adhesive tape disclosed by the invention is compounded with the non-setting adhesive layer on one surface of the PET base layer, and the non-setting adhesive layer prepared from the specific raw materials of the acrylic pressure-sensitive adhesive according to a specific dosage has excellent bonding performance, high stripping force and excellent static shearing property on low-surface-energy materials, particularly display screens; the polyurethane foaming layer provides good buffering performance and sealing performance for the polyurethane foaming double-sided adhesive tape.
Preferably, each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000022
preferably, the soft monomer is butyl acrylate and isooctyl acrylate according to a weight ratio of 25-35: 8-15 by mixing; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 1-3, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 2-4, mixing; the initiator is tert-butyl peroxypivalate, tert-butyl peroxyacetate, di-tert-butyl peroxide, tert-butyl peroxyneodecanoate or tert-amyl peroxypivalate.
By adopting the technical scheme, the butyl acrylate and the isooctyl acrylate are used as soft monomers together to provide stripping force and initial adhesion force for the acrylic pressure-sensitive adhesive; the vinyl acetate and the methyl methacrylate are used as hard monomers together to provide cohesive force for the acrylic pressure-sensitive adhesive; the acrylic acid serves as a functional monomer and provides a crosslinking point for the acrylic acid pressure-sensitive adhesive, the trimethylolpropane monoallyl ether and the di-trimethylolpropane serve as special monomers together, weather resistance and temperature resistance of the non-drying adhesive layer are improved, and the ethyl acetate serves as a solvent.
Preferably, the preparation method of each part of the acrylic pressure sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 72-75 ℃ for reaction, after the reaction is finished, preserving heat at the temperature of 65-70 ℃ for 2-4h, and cooling to obtain the acrylic pressure-sensitive adhesive.
According to the technical scheme, the acrylic pressure-sensitive adhesive with high stripping force, initial adhesion, weather resistance and temperature resistance is obtained by combining specific types and specific dosage ratios of the soft monomer, the functional monomer, the hard monomer, the special monomer and the initiator, and the acrylic pressure-sensitive adhesive has the combined action with the tackifying resin, the curing agent, the silane coupling agent, the black paste and the antioxidant, so that the acrylic pressure-sensitive adhesive has excellent bonding performance, high stripping force and excellent static shear property on low-surface-energy materials, particularly display screens. Further, in the step (R2), the initiator and ethyl acetate are mixed to dilute the initiator, so that the influence of severe reaction of the initiated monomer on the stripping force, initial adhesion, weather resistance and temperature resistance of the acrylic pressure-sensitive adhesive is avoided.
Preferably, the tackifying resin is rosin pentaerythritol tackifying resin; the type of the curing agent is TakenateD-110N, PUDS80 or PUDS 81; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
By adopting the technical scheme, the tackifying resin is rosin pentaerythritol tackifying resin which has a synergistic effect with the acrylic acid pressure-sensitive adhesive, so that the peeling force of the non-drying adhesive layer can be remarkably increased, and further, the type of the rosin pentaerythritol tackifying resin is PEDR-120M; the curing agent with the specific model is adopted, so that the curing effect is good; the black paste with the type is adopted, so that the adhesive layer is endowed with a better shading effect, the light leakage of the display screen after the polyurethane foaming double-sided adhesive is applied to the display screen is prevented, and the interference of external light to the inside of the display screen is also prevented.
Preferably, the silane coupling agent is at least one of gamma- (2, 3-glycidoxy) propyltrimethoxysilane, gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, and gamma-aminoethylaminopropyltrimethoxysilane.
By adopting the technical scheme, the silane coupling agent of the specific type is added into the acrylic pressure-sensitive adhesive, so that the non-drying adhesive layer has excellent adhesive property on low-surface-energy materials, particularly display screens, and the high temperature resistance and high humidity resistance of the non-drying adhesive layer can be improved. More preferably, the silane coupling agent is formed by mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and gamma-aminopropyl triethoxy silane according to the weight ratio of 3-5:1, and the high temperature resistance and high humidity resistance of the non-drying glue layer can be better ensured.
Preferably, the polyurethane foam double-sided adhesive further comprises a bearing main body layer sandwiched between the conductive shielding adhesive layer and the polyurethane foam layer, and the bearing main body layer is a TPU film.
Since the display screen is fragile and expensive, reworkability of the adhesive tape is required. When the existing foam adhesive tape is reworked, if the foam adhesive tape is directly torn by hand, the phenomenon of tearing foam easily occurs, more foam adhesive tapes are remained on a display screen, and the display screen is difficult to rework. By adopting the technical scheme, the polyurethane foaming double-sided adhesive tape is additionally provided with the bearing main body layer and is compounded with the polyurethane foaming layer, the TPU film adopted by the bearing main body layer has high tearing strength, tensile strength and elasticity, and in the subsequent working hours, the polyurethane foaming double-sided adhesive tape is more favorable for tearing the whole polyurethane foaming double-sided adhesive tape from the display screen, and the display screen reworking difficulty caused by the phenomenon that the foam is torn easily due to the low tearing strength of the polyurethane foaming layer and more foam adhesive tapes are remained on the display screen does not exist.
Preferably, the conductive shielding adhesive layer comprises a first conductive pressure-sensitive adhesive layer, a conductive base layer and a second conductive pressure-sensitive adhesive layer which are sequentially compounded, and the second conductive pressure-sensitive adhesive layer is attached to the TPU film.
By adopting the technical scheme, the first conductive pressure sensitive adhesive layer, the conductive base layer and the second conductive pressure sensitive adhesive layer form the conductive shielding adhesive layer, the problem that the screen display effect is influenced by current/electromagnetic interference is solved, and when the frequency of an interference electromagnetic field is higher, the eddy current generated by the conductive action of the conductive shielding adhesive layer is utilized to form the counteracting action on electromagnetic waves, so that the shielding effect is achieved.
Preferably, the first conductive pressure sensitive adhesive layer and the second conductive pressure sensitive adhesive layer are both made of acrylic acid pressure sensitive adhesive doped with conductive materials, and the conductive base layer is conductive cloth, conductive tissue paper, conductive non-woven fabric, copper foil or aluminum foil.
By adopting the technical scheme, the acrylic pressure-sensitive adhesive doped with the conductive material is adopted to provide the conductive performance for the first conductive pressure-sensitive adhesive layer and the second conductive pressure-sensitive adhesive layer, and when the frequency of an interference electromagnetic field is higher, eddy current generated in the conductive material can counteract electromagnetic waves externally, so that the shielding effect is achieved. Any one of the conductive base layers is adopted to provide conductive performance for the conductive base layer, so that the problem that the current/electromagnetic interference affects the work of the display screen is solved by combining the first conductive pressure-sensitive adhesive layer and the second conductive pressure-sensitive adhesive layer together. Further, the acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000051
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as those adopted by the non-setting adhesive layer in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120, the rosin tackifying resin is selected from TAMANOL803L, the curing agent is selected from DESMODUR L-75, and the conductive powder is atomized nickel powder. By utilizing the characteristic of low resistivity of the atomized nickel powder, when the frequency of an interference electromagnetic field is high, eddy currents generated in the atomized nickel powder can counteract electromagnetic waves externally, so that the shielding effect is achieved, and the acrylic pressure-sensitive adhesive doped with the conductive material is high in viscosity.
Further, the bearing main body layer is a black TPU film, and the thickness of the bearing main body layer is 20-100 μm; the polyurethane foaming layer is a black polyurethane foaming layer, and the thickness of the polyurethane foaming layer is 500-1500 mu m; the PET base layer is a black PET film, and the thickness of the PET base layer is 25-100 mu m; the thickness of the non-drying adhesive layer is 25-50 μm; the thickness of the first conductive pressure-sensitive adhesive layer is 25-50 μm, the thickness of the second conductive pressure-sensitive adhesive layer is 25-50 μm, and the thickness of the conductive base layer is 25-50 μm; the release layer is a PET release film or PET release paper, and the thickness of the release layer is 50-100 mu m. Adopt above-mentioned technical scheme, this polyurethane foaming double faced adhesive tape wholly sets to black, improves this polyurethane foaming double faced adhesive tape's shading effect, prevents that the light of display screen from revealing and also prevents the inside interference of outside light to the display screen. More preferably, the first conductive pressure sensitive adhesive layer has a thickness of 25 μm, 28 μm, 30 μm, 32 μm, 36 μm, 40 μm, 45 μm or 50 μm, the conductive base layer has a thickness of 25 μm, 28 μm, 30 μm, 32 μm, 36 μm, 40 μm, 45 μm or 50 μm, the second conductive pressure sensitive adhesive layer has a thickness of 25 μm, 28 μm, 30 μm, 32 μm, 36 μm, 40 μm, 45 μm or 50 μm, the carrier body layer has a thickness of 20 μm, 25 μm, 30 μm, 32 μm, 40 μm, 43 μm, 48 μm, 50 μm, 54 μm, 57 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm, and the polyurethane layer has a thickness of 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 800 μm, 850 μm, 750 μm, 1000 μm, 800 μm, and 900 μm, 1100 μm, 1200 μm, 1300 μm, 1400 μm or 1500 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm in thickness of the PET base layer, 25 μm, 28 μm, 30 μm, 32 μm, 36 μm, 40 μm, 45 μm or 50 μm in thickness of the non-drying adhesive layer, and 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm in thickness of the release layer.
The other purpose of the invention is realized by the following technical scheme: the preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking a PET base layer, coating polyurethane foaming glue on one surface of the PET base layer, attaching a bearing main body layer, and foaming, wherein the polyurethane foaming glue forms a polyurethane foaming layer;
(S2) coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer, drying to form a non-drying adhesive layer, and then attaching a release layer;
(S3) taking a conductive base layer, respectively coating conductive pressure-sensitive adhesives on two surfaces of the conductive base layer, and drying to form a first conductive pressure-sensitive adhesive layer and a second conductive pressure-sensitive adhesive layer;
(S4) after the second conductive pressure-sensitive adhesive layer is attached to the bearing main body layer, the second conductive pressure-sensitive adhesive layer is rolled, and the polyurethane foamed double-sided adhesive is obtained.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.2-0.8g/cm325% compression load of 0.16 to 0.46kgf/cm2。
The invention has the beneficial effects that: the polyurethane foaming double-sided adhesive tape disclosed by the invention is compounded with the non-setting adhesive layer on one surface of the PET base layer, and the non-setting adhesive layer prepared from the specific raw materials of the acrylic pressure-sensitive adhesive according to a specific dosage has excellent bonding performance, high stripping force and excellent static shearing property on low-surface-energy materials, particularly display screens; the polyurethane foaming layer provides good buffering performance and sealing performance for the polyurethane foaming double-sided adhesive tape.
The preparation method of the polyurethane foaming double-sided adhesive tape is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the reference signs are: 1. a conductive shielding glue layer; 11. a first conductive pressure sensitive adhesive layer; 12. a conductive base layer; 13. a second conductive pressure sensitive adhesive layer; 2. a carrier body layer; 3. a polyurethane foam layer; 4. a PET base layer; 5. a non-drying glue layer; 6. and a release layer.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Example 1
As shown in fig. 1, the polyurethane foamed double-sided adhesive tape comprises a conductive shielding adhesive layer 1, a bearing main body layer 2, a polyurethane foam layer 3, a PET base layer 4, a non-setting adhesive layer 5 and a release layer 6 which are sequentially compounded, wherein the bearing main body layer 2 is a TPU film.
The bearing main body layer 2 is a black TPU film, and the thickness of the bearing main body layer 2 is 50 μm.
The polyurethane foam layer 3 is a black polyurethane foam layer 3, and the thickness of the polyurethane foam layer 3 is 1000 μm.
The polyurethane foaming layer 3 is formed by coating polyurethane foaming glue on one surface of the PET base layer 4 and then laminating the TPU film and then foaming the TPU film.
The PET base layer 4 is a black PET film, and the thickness of the PET base layer 4 is 50 μm.
The non-drying adhesive layer 5 is made of acrylic pressure-sensitive adhesive, and the thickness of the non-drying adhesive layer 5 is 35 μm.
The release layer 6 is a PET release film, and the thickness of the release layer 6 is 80 μm. In other embodiments, the release layer 6 is PET release paper.
The conductive shielding adhesive layer 1 comprises a first conductive pressure-sensitive adhesive layer 11, a conductive base layer 12 and a second conductive pressure-sensitive adhesive layer 13 which are sequentially compounded, and the second conductive pressure-sensitive adhesive layer 13 is attached to the TPU film.
The first conductive pressure-sensitive adhesive layer 11 and the second conductive pressure-sensitive adhesive layer 13 are both made of acrylic pressure-sensitive adhesive doped with conductive materials, the thickness of the first conductive pressure-sensitive adhesive layer 11 is 35 micrometers, and the thickness of the second conductive pressure-sensitive adhesive layer 13 is 35 micrometers.
The conductive base layer 12 is a copper foil, and the thickness of the conductive base layer 12 is 35 μm. In other embodiments, the conductive base layer 12 is selected from a conductive cloth, a conductive tissue, a conductive non-woven fabric, or an aluminum foil.
Example 2
This example differs from example 1 in that:
the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000081
each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000091
the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 25: 8, mixing the components; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 1, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 2, mixing; the initiator is tert-butyl peroxypivalate.
The preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 72 ℃ for reaction, preserving heat at the temperature of 65 ℃ for 2 hours after the reaction is finished, and cooling to obtain the acrylic pressure-sensitive adhesive.
The type of the rosin pentaerythritol tackifying resin is PEDR-120M; the type of the curing agent is TakenateD-110N; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
The silane coupling agent is gamma-aminopropyl triethoxysilane.
The acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000092
Figure BDA0002579346390000101
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the non-drying adhesive layer 5 in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120 in type, the rosin tackifying resin is selected from TAMANOL803L in type, the curing agent is selected from DESMODUR L-75 in type, and the conductive powder is atomized nickel powder.
The preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking the PET base layer 4, coating polyurethane foaming glue on one surface of the PET base layer 4, attaching the bearing main body layer 2, and foaming to form a polyurethane foaming layer 3;
(S2), coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer 4, drying to form a non-drying adhesive layer 5, and then attaching a release layer 6;
(S3), taking the conductive base layer 12, and respectively coating and drying the conductive pressure-sensitive adhesive on the two sides of the conductive base layer 12 to form a first conductive pressure-sensitive adhesive layer 11 and a second conductive pressure-sensitive adhesive layer 13;
(S4) attaching the second conductive pressure-sensitive adhesive layer 13 to the bearing main body layer 2, and rolling to obtain the polyurethane foam double-sided adhesive tape.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.56g/cm325% compression load of 0.16kgf/cm2。
Example 3
This example differs from example 1 in that:
the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000111
each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000112
the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 28: 10, mixing the components; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 2, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 3, mixing; the initiator is tert-butyl peroxypivalate.
The preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at 73 ℃ for reaction, after the reaction is finished, preserving heat at 66 ℃ for 3h, and cooling to obtain the acrylic pressure-sensitive adhesive.
The type of the rosin pentaerythritol tackifying resin is PEDR-120M; the type of the curing agent is PUDS 80; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
The silane coupling agent is formed by mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and gamma-aminopropyl triethoxy silane according to the weight ratio of 3-5: 1.
The acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000121
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the non-drying adhesive layer 5 in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120 in type, the rosin tackifying resin is selected from TAMANOL803L in type, the curing agent is selected from DESMODUR L-75 in type, and the conductive powder is atomized nickel powder.
The preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking the PET base layer 4, coating polyurethane foaming glue on one surface of the PET base layer 4, attaching the bearing main body layer 2, and foaming to form a polyurethane foaming layer 3;
(S2), coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer 4, drying to form a non-drying adhesive layer 5, and then attaching a release layer 6;
(S3), taking the conductive base layer 12, and respectively coating and drying the conductive pressure-sensitive adhesive on the two sides of the conductive base layer 12 to form a first conductive pressure-sensitive adhesive layer 11 and a second conductive pressure-sensitive adhesive layer 13;
(S4) attaching the second conductive pressure-sensitive adhesive layer 13 to the bearing main body layer 2, and rolling to obtain the polyurethane foam double-sided adhesive tape.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.56g/cm325% compression load of 0.16kgf/cm2。
Example 4
This example differs from example 1 in that:
the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000131
each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000132
the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 28: 12, mixing the components; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 2, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 3, mixing; the initiator is tert-butyl peroxyacetate.
The preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 74 ℃ for reaction, preserving heat at the temperature of 67 ℃ for 3 hours after the reaction is finished, and cooling to obtain the acrylic pressure-sensitive adhesive.
The type of the rosin pentaerythritol tackifying resin is PEDR-120M; the type of the curing agent is PUDS 81; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
The silane coupling agent is formed by mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and gamma-aminopropyl triethoxy silane according to the weight ratio of 4: 1.
The acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000141
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the non-drying adhesive layer 5 in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120 in type, the rosin tackifying resin is selected from TAMANOL803L in type, the curing agent is selected from DESMODUR L-75 in type, and the conductive powder is atomized nickel powder.
The preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking the PET base layer 4, coating polyurethane foaming glue on one surface of the PET base layer 4, attaching the bearing main body layer 2, and foaming to form a polyurethane foaming layer 3;
(S2), coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer 4, drying to form a non-drying adhesive layer 5, and then attaching a release layer 6;
(S3), taking the conductive base layer 12, and respectively coating and drying the conductive pressure-sensitive adhesive on the two sides of the conductive base layer 12 to form a first conductive pressure-sensitive adhesive layer 11 and a second conductive pressure-sensitive adhesive layer 13;
(S4) attaching the second conductive pressure-sensitive adhesive layer 13 to the bearing main body layer 2, and rolling to obtain the polyurethane foam double-sided adhesive tape.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.56/cm325% compression load of 0.16kgf/cm2。
Example 5
This example differs from example 1 in that:
the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000151
each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000152
Figure BDA0002579346390000161
the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 32: 12, mixing the components; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 3, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 3, mixing; the initiator is tert-butyl peroxyacetate.
The preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 74 ℃ for reaction, preserving heat at the temperature of 69 ℃ for 3 hours after the reaction is finished, and cooling to obtain the acrylic pressure-sensitive adhesive.
The type of the rosin pentaerythritol tackifying resin is PEDR-120M; the type of the curing agent is PUDS 80; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
The silane coupling agent is formed by mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and gamma-aminopropyl triethoxy silane according to the weight ratio of 4: 1.
The acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000162
Figure BDA0002579346390000171
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the non-drying adhesive layer 5 in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120 in type, the rosin tackifying resin is selected from TAMANOL803L in type, the curing agent is selected from DESMODUR L-75 in type, and the conductive powder is atomized nickel powder.
The preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking the PET base layer 4, coating polyurethane foaming glue on one surface of the PET base layer 4, attaching the bearing main body layer 2, and foaming to form a polyurethane foaming layer 3;
(S2), coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer 4, drying to form a non-drying adhesive layer 5, and then attaching a release layer 6;
(S3), taking the conductive base layer 12, and respectively coating and drying the conductive pressure-sensitive adhesive on the two sides of the conductive base layer 12 to form a first conductive pressure-sensitive adhesive layer 11 and a second conductive pressure-sensitive adhesive layer 13;
(S4) attaching the second conductive pressure-sensitive adhesive layer 13 to the bearing main body layer 2, and rolling to obtain the polyurethane foam double-sided adhesive tape.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.56/cm325% compression load of 0.16kgf/cm2。
Example 6
This example differs from example 1 in that:
the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000172
Figure BDA0002579346390000181
each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure BDA0002579346390000182
the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 35: 15 are mixed; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 3, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 4, mixing; the initiator is tert-butyl peroxypivalate.
The preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 75 ℃ for reaction, preserving heat at the temperature of 70 ℃ for 4 hours after the reaction is finished, and cooling to obtain the acrylic pressure-sensitive adhesive.
The type of the rosin pentaerythritol tackifying resin is PEDR-120M; the type of the curing agent is PUDS 81; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
The silane coupling agent is formed by mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and gamma-aminopropyl triethoxy silane according to the weight ratio of 5: 1.
The acrylic pressure-sensitive adhesive doped with the conductive material comprises the following raw materials in parts by weight:
Figure BDA0002579346390000191
the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the acrylic pressure-sensitive adhesive doped with the conductive material are the same as the acrylic pressure-sensitive adhesive, the silane coupling agent and the black paste adopted by the non-drying adhesive layer 5 in type, the petroleum C9 tackifying resin is selected from YUEN LIANG YL-120 in type, the rosin tackifying resin is selected from TAMANOL803L in type, the curing agent is selected from DESMODUR L-75 in type, and the conductive powder is atomized nickel powder.
The preparation method of the polyurethane foaming double-sided adhesive tape comprises the following steps:
(S1) taking the PET base layer 4, coating polyurethane foaming glue on one surface of the PET base layer 4, attaching the bearing main body layer 2, and foaming to form a polyurethane foaming layer 3;
(S2), coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer 4, drying to form a non-drying adhesive layer 5, and then attaching a release layer 6;
(S3), taking the conductive base layer 12, and respectively coating and drying the conductive pressure-sensitive adhesive on the two sides of the conductive base layer 12 to form a first conductive pressure-sensitive adhesive layer 11 and a second conductive pressure-sensitive adhesive layer 13;
(S4) attaching the second conductive pressure-sensitive adhesive layer 13 to the bearing main body layer 2, and rolling to obtain the polyurethane foam double-sided adhesive tape.
The density of a polyurethane foaming layer formed after the polyurethane foaming adhesive is foamed is 0.56/cm325% compression load of 0.16kgf/cm2。
Comparative example 1
This comparative example differs from example 2 in that:
the first conductive pressure-sensitive adhesive layer and the second conductive pressure-sensitive adhesive layer are free of silane coupling agents and conductive powder.
Comparative example 2
This comparative example differs from example 4 in that:
the polyurethane foaming double faced adhesive tape is free of TPU film.
Comparative example 3
This comparative example differs from example 4 in that:
the using amount of the black paste used by the first conductive pressure sensitive adhesive layer, the second conductive pressure sensitive adhesive layer and the adhesive layer is 1.5 parts.
Comparative example 4
This comparative example differs from example 4 in that:
the using amount of the black paste used by the first conductive pressure sensitive adhesive layer, the second conductive pressure sensitive adhesive layer and the adhesive layer is 5.5 parts.
Comparative example 5
This comparative example differs from example 4 in that:
the oil C9 tackifying resin used by the acrylic pressure sensitive adhesive doped with the conductive material is SK-90, and the rosin tackifying resin is KF 382S; the tackifying resin used by the acrylic pressure-sensitive adhesive is rosin glycerol ester KB 90.
Example 7
Taking the polyurethane foaming double-sided adhesive prepared in the examples 2-6 and the comparative examples 1-5 for carrying out the detection of stripping force, high temperature and high humidity resistance, static shearing force, compression load and resistance;
the test method comprises the following steps:
and (3) testing the peeling force: testing the peeling force by referring to the standard GB/T2792-2014, and respectively testing the SUS plate, the PC plate and the Glass plate;
static shear force test: testing the static shear force according to the standard GB/T4851-2014;
and (3) compression load testing: the compression load is tested according to standard D3574, and the test sample is tested on a PC board by using the conditions of 25mm width, 60 ℃/95% static shear force and 1kg load;
and (3) testing high temperature and high humidity resistance: the specification of the sample is 1.8mm wide, a television screen and a bottom frame with 1140mm x 640mm are attached, the weight of the screen is 2.2kg, the screen is tested for 240 hours under the conditions of forward inclination of 35 degrees and 60 ℃/90RH, and the conditions of glue opening, damage, light leakage and difficulty and easiness in rework are judged;
and (3) resistance testing: the surface resistance of the first conductive pressure sensitive adhesive layer was tested with reference to the standard GB/T33375-.
The test results are shown in table 1 below:
TABLE 1
Figure BDA0002579346390000211
Figure BDA0002579346390000221
As can be seen from the above Table 1, the comparison between the comparative example 1 and the example 2 shows that the high temperature and high humidity resistance can be improved by using the silane coupling agent of the present invention, and if no silane coupling agent is present, the phenomenon of poor glue opening can occur during the high temperature and high humidity simulation test; the surface resistance of the first conductive pressure sensitive adhesive layer of the comparative example 1 is much larger than that of the first conductive pressure sensitive adhesive layer of the example 1, which shows that the atomized nickel powder adopted by the invention has a remarkable promotion effect on the conductive effect of the first conductive pressure sensitive adhesive layer.
Example 4 compared with comparative example 2, if there is no TPU film in the structure, there occurs a problem that the screen is stuck and reworking is difficult in the subsequent reworking. The TPU film is a thermoplastic polyether type polyurethane elastomer, has good elasticity and wear resistance, and has outstanding bearing capacity, impact resistance and shock absorption performance. In subsequent time returning, the polyurethane foaming double-sided adhesive tape can be pulled out from the display screen through pulling and tearing without adhesive residue.
In example 4, compared with comparative examples 3 and 4, if the amount of the black paste used in the first conductive pressure sensitive adhesive layer, the second conductive pressure sensitive adhesive layer, and the adhesive layer is small, the light leakage phenomenon occurs after the high temperature and high humidity simulation test. And if the black paste used by the first conductive pressure sensitive adhesive layer, the second conductive pressure sensitive adhesive layer and the non-setting adhesive layer is too much, the overall comprehensive performance is influenced.
Example 4 compared with comparative example 5, the performance of the polyurethane foaming double-sided adhesive tape is greatly influenced by the special type of the tackifying resin.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.

Claims (10)

1. A polyurethane foaming double faced adhesive tape is characterized in that: including compound electrically conductive shielding adhesive layer, polyurethane foaming layer, PET basic unit, not dry adhesive layer in proper order and from the type layer, not dry adhesive layer is made by acrylic acid pressure-sensitive adhesive, acrylic acid pressure-sensitive adhesive includes the raw materials of following parts by weight:
Figure FDA0002579346380000011
2. the polyurethane foam double sided tape of claim 1, wherein: each part of the acrylic pressure-sensitive adhesive comprises the following raw materials in parts by weight:
Figure FDA0002579346380000012
3. the polyurethane foam double sided tape of claim 2, wherein: the soft monomer is prepared from butyl acrylate and isooctyl acrylate according to a weight ratio of 25-35: 8-15 by mixing; the functional monomer is acrylic acid; the hard monomer is vinyl acetate and methyl methacrylate according to a weight ratio of 3: 1-3, mixing; the special monomer is trimethylolpropane monoallyl ether and di-trimethylolpropane according to the weight ratio of 3: 2-4, mixing; the initiator is at least one of tert-butyl peroxypivalate, tert-butyl peroxyacetate, di-tert-butyl peroxide, tert-butyl peroxyneodecanoate or tert-amyl peroxypivalate.
4. The polyurethane foam double sided tape of claim 2, wherein: the preparation method of each part of the acrylic pressure-sensitive adhesive comprises the following steps:
(R1), weighing soft monomers, functional monomers, hard monomers, special monomers, initiators and ethyl acetate according to parts by weight for later use;
(R2) mixing an initiator with ethyl acetate to obtain a diluted solution;
(R3), uniformly stirring the soft monomer, the functional monomer, the hard monomer and the special monomer, adding the diluent at the temperature of 72-75 ℃ for reaction, after the reaction is finished, preserving heat at the temperature of 65-70 ℃ for 2-4h, and cooling to obtain the acrylic pressure-sensitive adhesive.
5. The polyurethane foam double sided tape of claim 1, wherein: the tackifying resin is rosin pentaerythritol tackifying resin; the type of the curing agent is Takenate D-110N, PUDS80 or PUDS 81; the type of the BLACK paste is SEIKABEAM BC-BLACK; the antioxidant is model LRGANOX 1010.
6. The polyurethane foam double sided tape of claim 1, wherein: the silane coupling agent is at least one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, gamma-aminopropyl triethoxy silane, gamma-methacryloxypropyl trimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, gamma-mercaptopropyl triethoxy silane and gamma-aminoethylaminopropyl trimethoxy silane.
7. The polyurethane foam double sided tape of claim 1, wherein: the polyurethane foaming double faced adhesive tape further comprises a bearing main body layer clamped between the conductive shielding adhesive layer and the polyurethane foaming layer, and the bearing main body layer is a TPU film.
8. The polyurethane foam double sided tape of claim 7, wherein: the conductive shielding adhesive layer comprises a first conductive pressure-sensitive adhesive layer, a conductive base layer and a second conductive pressure-sensitive adhesive layer which are sequentially compounded, and the second conductive pressure-sensitive adhesive layer is attached to the TPU film.
9. The polyurethane foam double sided tape of claim 8, wherein: the first conductive pressure-sensitive adhesive layer and the second conductive pressure-sensitive adhesive layer are both made of acrylic acid pressure-sensitive adhesive doped with conductive materials, and the conductive base layer is conductive cloth, conductive tissue paper, conductive non-woven fabric, copper foil or aluminum foil.
10. A method for preparing the polyurethane foam double-sided adhesive tape according to claim 8 or 9, characterized in that: the method comprises the following steps:
(S1) taking a PET base layer, coating polyurethane foaming glue on one surface of the PET base layer, attaching a bearing main body layer, and foaming, wherein the polyurethane foaming glue forms a polyurethane foaming layer;
(S2) coating acrylic acid pressure-sensitive adhesive on the other side of the PET base layer, drying to form a non-drying adhesive layer, and then attaching a release layer;
(S3) taking a conductive base layer, respectively coating conductive pressure-sensitive adhesives on two surfaces of the conductive base layer, and drying to form a first conductive pressure-sensitive adhesive layer and a second conductive pressure-sensitive adhesive layer;
(S4) after the second conductive pressure-sensitive adhesive layer is attached to the bearing main body layer, the second conductive pressure-sensitive adhesive layer is rolled, and the polyurethane foamed double-sided adhesive is obtained.
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CN113444466B (en) * 2021-05-17 2022-09-02 江阴通利光电科技有限公司 Reworking double-sided foam adhesive tape, reworking method and preparation method
CN113717654A (en) * 2021-08-26 2021-11-30 昆山汉品电子有限公司 Modified self-adaptive exhaust transparent pressure-sensitive adhesive, product and production method thereof
CN114561160A (en) * 2022-01-10 2022-05-31 纳电(深圳)材料科技有限公司 High-temperature-resistant anti-static PI adhesive tape and preparation method thereof
CN116042120A (en) * 2023-01-06 2023-05-02 苏州市星辰科技有限公司 High-viscosity acrylic foam double-sided tape and gluing device thereof
CN117511442A (en) * 2023-11-02 2024-02-06 极天羽技术股份有限公司 PE foam double faced adhesive tape for bonding and fixing mobile phone rear cover and middle frame

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