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WO2018072137A1 - Papier adhésif structural et procédé de préparation associé - Google Patents

Papier adhésif structural et procédé de préparation associé Download PDF

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Publication number
WO2018072137A1
WO2018072137A1 PCT/CN2016/102556 CN2016102556W WO2018072137A1 WO 2018072137 A1 WO2018072137 A1 WO 2018072137A1 CN 2016102556 W CN2016102556 W CN 2016102556W WO 2018072137 A1 WO2018072137 A1 WO 2018072137A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
adhesive layer
structural
release film
agent particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/102556
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English (en)
Chinese (zh)
Inventor
戴志芳
龙海
陶兴华
张盛武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Priority to PCT/CN2016/102556 priority Critical patent/WO2018072137A1/fr
Publication of WO2018072137A1 publication Critical patent/WO2018072137A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients
    • 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
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive 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
    • 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
    • C09J2301/412—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of microspheres
    • 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
    • C09J2433/00—Presence of (meth)acrylic polymer
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • 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 invention relates to the field of adhesive tape, in particular to a structural adhesive tape and a preparation method thereof.
  • the prior art adhesive tape is generally foamed by using a PET substrate and an acrylate-based pressure-sensitive adhesive plus a foaming agent particle to cause peeling with a blank current collector (a current collector of the uncoated electrode slurry) to A tab slot is reserved on the blank current collector.
  • a blank current collector a current collector of the uncoated electrode slurry
  • FIGS. 8A and 8B when the residual solvent amount of the adhesive layer 2' is excessively large (>10%), the blowing agent particles 21' are completely coated in the adhesive even if the blowing agent particles 21' After expansion after foaming, it is also impossible to effectively reduce the contact area between the adhesive and the blank current collector, which makes the adhesive paper difficult to peel off, and it is impossible to reserve a ferrule on the blank current collector. Referring to FIGS.
  • the bonding interface between the adhesive layer and the blank current collector is not flat, and the thickness of the adhesive layer is usually required to be small, and the precision of the coating process is conventional. Unable to meet the requirements, thickness fluctuations lead to a large number of products scrapped.
  • Another object of the present invention is to provide a structural adhesive tape and a preparation method thereof, the structural adhesive tape
  • the viscosity consistency with the object to be bonded is extremely high, and it is easy to carry out batch production, and solves the problem that the viscosity of the foaming agent particles in the conventional adhesive tape is severe after foaming.
  • Another object of the present invention is to provide a structural adhesive tape and a preparation method thereof, which can improve the utilization rate of the active material of the battery, avoid waste of the active material, and improve the energy density and fast-release performance of the battery. And heat dissipation.
  • the present invention provides a structural adhesive tape comprising: a first adhesive layer attached to a release film; and a substrate disposed on the first adhesive layer a side away from the release film; and a second adhesive layer between the first adhesive layer and the substrate and including a second adhesive.
  • the first adhesive layer comprises: a first adhesive; and a foaming agent particle distributed on the first adhesive, and the quality of the foaming agent particles is the sum of the masses of the first adhesive and the foaming agent particles 20% to 70%.
  • the surface of the first adhesive layer away from the release film is a first surface
  • the surface of the first adhesive layer adjacent to the release film is a second surface. Part of the blowing agent particles are exposed on the first surface and embedded in the second adhesive layer, and the second surface of the first adhesive layer is attached to the release film.
  • the invention provides a method for preparing a structural adhesive paper for preparing the structural adhesive paper according to one aspect of the invention, comprising the steps of: first adhesive, foaming agent particles And the first solvent is stirred to form a slurry of the first adhesive layer, and the slurry of the first adhesive layer is coated on the release film, wherein the surface of the first adhesive layer away from the release film a first surface, the surface of the first adhesive layer adjacent to the release film is a second surface, heated to a first temperature for drying to remove the first solvent, and a portion of the blowing agent particles are exposed to the first adhesive
  • the first layer of the first adhesive layer is adjacent to the first surface of the release film, and the second surface of the first adhesive layer is adjacent to the release film, wherein the first temperature is lower than the release of the foaming agent particles.
  • the bubble temperature, the mass of the foaming agent particles is 20% to 70% of the sum of the masses of the first adhesive and the foaming agent particles; and the second adhesive and the second solvent are stirred to form the second adhesive layer Slurry, coating the slurry of the second adhesive layer on the substrate, heating to a second temperature for drying to remove the first a solvent; curing the first surface of the first adhesive layer away from the release film and the surface of the second adhesive layer away from the substrate and heating to a third temperature for curing, the third temperature is low At the foaming temperature of the foaming agent particles, the preparation of the structural adhesive paper is completed.
  • the structural adhesive paper of the present invention has a flat surface, a good thickness consistency, and is easy to be attached to the object to be bonded.
  • the structural adhesive tape of the invention has extremely high viscosity consistency with the object to be bonded, and is easy to be mass-produced.
  • the production solves the problem that the viscosity of the foaming agent particles in the conventional adhesive tape is severe after foaming.
  • the structural adhesive tape of the invention can improve the utilization rate of the active material of the battery, avoid the waste of the active material, and at the same time improve the energy density, fast-release performance and heat dissipation performance of the battery.
  • FIG. 1 is a perspective view of a current collector of a bonded object applied to a structural adhesive tape of the present invention
  • FIG. 2 is a perspective view of the structural adhesive tape of the present invention adhered to a current collector of the object to be bonded, wherein the release film of the structural adhesive tape is peeled off;
  • FIG. 3 is a perspective view of the structural adhesive paper-coated electrode slurry of the present invention, wherein the release film of the structural adhesive paper is peeled off;
  • Figure 4 is a perspective view of the structural adhesive tape of the present invention after peeling off
  • Figure 5 is a perspective view of the structural adhesive tape of the present invention.
  • Figure 6 is a front view of Figure 5;
  • Figure 7 is a schematic view showing the pressure composite of the structural adhesive tape of the present invention.
  • FIG. 8A to 8B are schematic views of an embodiment of a prior art adhesive tape, wherein FIG. 8A shows a schematic view of the foaming agent particles before foaming, and FIG. 8B shows a schematic view of the foaming agent particles after foaming;
  • FIG. 9A to 9B are schematic views showing another embodiment of the prior art adhesive tape, wherein FIG. 9A shows a schematic view of the foaming agent particles before foaming, and FIG. 9B shows a schematic view of the foaming agent particles after foaming;
  • FIGS. 10A to 10B are schematic views showing still another embodiment of the prior art adhesive tape, wherein Fig. 10A shows a schematic view of the foaming agent particles before foaming, and Fig. 10B shows a schematic view of the foaming agent particles after foaming.
  • the structural adhesive tape 1 according to the first aspect of the present invention comprises: a first adhesive layer 11 attached to the release film M; and a substrate 13 located at the first adhesive. a side of the layer 11 remote from the release film M; and a second adhesive layer 12 between the first adhesive layer 11 and the substrate 13 and including a second adhesive.
  • the first adhesive layer 11 includes: a first adhesive; and foaming agent particles 111 distributed on the first adhesive, and the mass of the blowing agent particles 111 is the first adhesive and the blowing agent particles 111 20% to 70% of the sum of the quality.
  • the surface of the first adhesive layer 11 remote from the release film is the first surface 11S1, and the surface of the first adhesive layer 11 near the release film is the second surface 11S2. Part of the blowing agent particles 111 are exposed on the first surface 11S1 and embedded in the second adhesive layer 12, and the second surface 11S2 of the first adhesive layer 11 is attached to the release film M.
  • the mass of the blowing agent particles 111 is 20% to 70% of the sum of the masses of the first adhesive agent and the blowing agent particles 111, and the blowing agent particles
  • the mass percentage of 111 is too high, which tends to cause early loss of adhesion of the structural adhesive tape, and the mass percentage of the foaming agent particles 111 is too low, which is likely to cause poor foaming.
  • the lower limit value of the mass percentage of the blowing agent particles 111 may be 20%, 25%, 30%, and the lower limit value of the mass percentage of the blowing agent particles 111 may be 30%, 35%, 40 %, 45%, 50%, 55%, 60%, 65%, 70%.
  • the mass of the blowing agent particles 111 is the sum of the masses of the first adhesive and the blowing agent particles 111. 25% to 35%.
  • the second adhesive layer 12 contains no blowing agent particles.
  • the first adhesive layer 11 has a thickness of 40 ⁇ m to 50 ⁇ m.
  • the second adhesive layer 12 has a thickness of 4 ⁇ m to 10 ⁇ m.
  • the first adhesive is one or more selected from the group consisting of an acrylate type adhesive and a urethane adhesive.
  • the second adhesive is one or more selected from the group consisting of an acrylate type adhesive and a urethane adhesive.
  • the material of the first adhesive and the second adhesive may be different.
  • the substrate 13 has a thickness of 15 ⁇ m to 36 ⁇ m.
  • the substrate 13 is selected from the group consisting of polyethylene terephthalate (PET).
  • the particle size of the blowing agent particles 111 is from 5 ⁇ m to 30 ⁇ m.
  • the blowing agent particles 111 are physical blowing agents and/or chemical blowing agents.
  • the physical foaming agent is an alkane long chain series foaming agent.
  • the physical blowing agent is selected from one or more of an isopentane blowing agent, an isobutane blowing agent, and a cyclopentane blowing agent.
  • the chemical blowing agent is selected from the group consisting of azodicarbonamide, azobisisobutyronitrile, N,N-dinitrosopentamethylenetetramine, 4,4'-oxobisbenzenesulfonyl hydrazide, One or more of tosylhydrazide.
  • the first adhesive layer 11 and/or the second adhesive layer 12 further includes a curing agent.
  • the curing agent in the first adhesive layer 11 may be the same as or different from the curing agent in the second adhesive layer 12.
  • the curing agent may be a room temperature curing agent.
  • the curing agent is selected from one or more of an aliphatic polyamine, an alicyclic polyamine, a polyamide (preferably a low molecular weight polyamide), a modified aromatic amine, and an isocyanate.
  • the release film M may be a silicone oil-coated PET film.
  • the release film M in the structural adhesive sheet 1 is peeled off, and the exposed first adhesive layer 11 is used for being pasted. Bonded to the object.
  • the object to be bonded may be a blank current collector 2, and the structure is applied before the electrode paste 3 is applied on the blank current collector 2.
  • the release film M in the adhesive tape 1 is peeled off, and the first adhesive layer 11 of the structural adhesive tape 1 is pasted on the reserved region 21 of the blank current collector 2 forming the tabs, when coated on the blank current collector 2
  • the electrode paste 3 is dried. After the drying is completed, the structural adhesive tape 1 is peeled off to form a reserved area 21 of the tab.
  • a method for preparing a structural adhesive paper according to a second aspect of the present invention is for use in the preparation of the structural adhesive paper 1 of the first aspect of the present invention, comprising the steps of: first adhesive, foaming agent particles 111, and The slurry of the first adhesive layer 11 is stirred by a solvent, and the slurry of the first adhesive layer 11 is coated on the release film M, wherein the first adhesive layer 11 is away from the release film.
  • the surface of M is the first surface 11S1, and the surface of the first adhesive layer 11 close to the release film M is the second surface 11S2, heated to a first temperature for drying to remove the first solvent, and a partial foaming agent
  • the particle 111 is exposed on the first surface 11S1 of the first adhesive layer 11 away from the release film M, and the second surface 11S2 of the first adhesive layer 11 near the release film M remains adhered to the release film M.
  • the first temperature is lower than the foaming temperature of the blowing agent particles 111, and the mass of the blowing agent particles 111 is 20% to 70% of the sum of the masses of the first adhesive agent and the blowing agent particles 111;
  • the second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer 12, and the slurry of the second adhesive layer 12 is coated on the substrate 13.
  • the composite is heated and heated to a third temperature for curing, which is lower than the foaming temperature of the blowing agent particles 111, that is, the preparation of the structural adhesive paper 1 is completed.
  • the partial blowing agent particles 111 are exposed to the first adhesive layer 11 when heated to a first temperature for drying to remove the first solvent.
  • the second surface 11S2 of the first adhesive layer 11 close to the release film M is adhered to the release film M, so when the release film M is peeled off, The second surface 11S2 of the adhesive layer 11 is kept flat, so that the structural adhesive paper 1 has a uniform thickness and is easily attached to the object to be bonded.
  • the structural adhesive paper 1 is During use (release film M is peeled off, exposed first adhesive layer 11 is applied to the object to be bonded, such as stuck on the current collector 2 of FIG. 1), and the foaming agent particles 111 are foamed. It is easy to break through the second surface 11S2 of the first adhesive layer 11, and the structural adhesive paper 1 is neither completely detached from the object to be bonded nor completely attached, so that the structural adhesive tape 1 is easily peeled off from the bonded object.
  • the post-foam structure adhesive paper 1 has good consistency of adhesion, and does not cause poor foaming and residual glue.
  • the residual amount of the first solvent accounts for the slurry of the first adhesive layer 11.
  • the ratio of the total weight is not more than 1%.
  • the residual amount of the second solvent accounts for the slurry of the second adhesive layer 12.
  • the ratio of the total weight is not more than 1%.
  • the first temperature is from 75 ° C to 85 ° C, and the baking time is not less than 2 min.
  • the second temperature is from 75 ° C to 85 ° C, and the baking time is not less than 1 min.
  • the third temperature is 40 ° C to 45 ° C
  • the curing time is 48 h to 72 h.
  • the coating of the slurry of the first adhesive layer 11 is selected from extrusion coating, blade coating, spray coating or transfer coating.
  • the coating of the slurry of the second adhesive layer 12 is selected from extrusion coating, blade coating, spray coating or transfer coating.
  • the first adhesive layer 11 of the first adhesive layer 11 away from the release film M and the second adhesive layer 12 are away from the substrate.
  • the surface of 13 is compounded under a pressure of 5 kg to 12 kg.
  • the first surface 11S1 of the first adhesive layer 11 away from the release film M and the second adhesive layer 12 may be away from the base.
  • the surface of the material 13 is first pressure-composited, and then heated to a third temperature for curing; or the first surface 11S1 of the first adhesive layer 11 away from the release film M and the second adhesive layer 12 may be away from the base.
  • the surface of the material 13 is heated to a third temperature while being pressed and composited to be aged.
  • the first adhesive acrylate adhesive, foaming agent particles cyclopentane (filtered through a 150 mesh sieve, foaming temperature of 120 ° C ⁇ 130 ° C) and ethyl acetate at 40 rpm ⁇ 60 rpm
  • the slurry of the first adhesive layer was prepared by stirring for 30 minutes, wherein the mass of the blowing agent particles was 25% of the sum of the masses of the first adhesive and the blowing agent particles.
  • the slurry of the first adhesive layer is coated on the release film by a doctor blade to form a roll I, and the roll I is heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate (the residual amount is not more than 1%)
  • the speed of the coil I is 10m/min ⁇ 12m/min
  • the thickness of the slurry coating is 40 ⁇ m
  • the part of the blowing agent particle cyclopentane is exposed to the first layer of the first adhesive layer away from the release film.
  • the surface, the second surface of the first adhesive layer adjacent to the release film remains attached to the release film.
  • a slurry of the second adhesive layer was prepared by stirring the second adhesive acrylate type adhesive and toluene at a rotation speed of 40 rpm to 60 rpm for 30 minutes.
  • the slurry of the second adhesive layer is coated on the substrate PET (thickness 15 ⁇ m) by a doctor blade to form a roll II, and the roll II is heated to an oven temperature of 75 ° C for 2 min to remove toluene (the residual amount is not More than 1%), the winding speed of the coil II is 10 m/min to 12 m/min, and the thickness of the slurry coating is 5 ⁇ m.
  • the first surface of the first adhesive layer in the roll I away from the release film and the surface of the second adhesive layer in the roll II away from the substrate are combined under a pressure of 6 kg, and the recombination speed is 5 m/min ⁇ 45 m / min, after heating to 45 ° C for 60 h, the completion of the preparation of structural adhesive tape.
  • the release film is peeled off, the first adhesive layer of the structural adhesive tape is pasted on the blank current collector aluminum foil, the positive electrode slurry is coated on the current collector, and then placed in an oven to heat the foaming agent particles cyclopentane.
  • the structural adhesive tape is curled. After the positive electrode slurry layer is completely dried, the current collector is removed from the oven and passed through the mechanical hair. The brush peels off the structural adhesive tape, which forms a reserved area for the tabs.
  • Table 1 gives the test results of the parallel test, and the structural adhesive tape is pasted on the current collector to make the patch flat, without the appearance of oblique rubber or wrinkles.
  • the first adhesive acrylate adhesive, foaming agent particles cyclopentane (filtered through a 150 mesh sieve, foaming temperature of 120 ° C ⁇ 130 ° C) and ethyl acetate at 40 rpm ⁇ 60 rpm
  • the slurry of the first adhesive layer was prepared by stirring for 30 minutes, wherein the mass of the blowing agent particles was 60% of the sum of the masses of the first adhesive and the blowing agent particles.
  • the slurry of the first adhesive layer is coated on the release film by a doctor blade to form a roll I, and the roll I is heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate (the residual amount is not more than 1%)
  • the speed of the coil I is 10m/min ⁇ 12m/min
  • the thickness of the slurry coating is 50 ⁇ m
  • the part of the blowing agent particle cyclopentane is exposed to the first layer of the first adhesive layer away from the release film.
  • the surface, the second surface of the first adhesive layer adjacent to the release film remains attached to the release film.
  • a slurry of the second adhesive layer was prepared by stirring the second adhesive acrylate type adhesive and toluene at a rotation speed of 40 rpm to 60 rpm for 30 minutes.
  • the slurry of the second adhesive layer is coated on the substrate PET (thickness 15 ⁇ m) by a doctor blade to form a roll II, and the roll II is heated to an oven temperature of 75 ° C for 2 min to remove toluene (the residual amount is not More than 1%), the winding speed of the coil II is 10 m/min to 12 m/min, and the thickness of the slurry coating is 5 ⁇ m.
  • the first surface of the first adhesive layer in the roll I away from the release film and the surface of the second adhesive layer in the roll II away from the substrate are combined under a pressure of 6 kg, and the recombination speed is 5 m/min ⁇ 45 m / min, after heating to 45 ° C for 60 h, the completion of the preparation of structural adhesive tape.
  • the release film is peeled off, the first adhesive layer of the structural adhesive tape is pasted on the blank current collector aluminum foil, the positive electrode slurry is coated on the current collector, and then placed in an oven to heat the foaming agent particles cyclopentane. Knot The adhesive paper is curled. After the positive slurry layer is completely dried, the current collector is removed from the oven, and the structural adhesive paper is peeled off by a mechanical brush to form a reserved area of the tab.
  • Table 2 gives the test results of the parallel test, and the structural adhesive tape is pasted on the current collector to make the patch flat, without the appearance of oblique rubber or wrinkle.
  • a slurry is prepared in which the mass of the blowing agent particles is 25% of the sum of the masses of the binder and the blowing agent particles.
  • the slurry was coated on a substrate PET (thickness 15 ⁇ m) by a doctor blade to form a roll, and the roll was heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate, and the roll speed was 10 m/min to 12 m. /min, the slurry coating thickness was 50 ⁇ m. After heating to 45 ° C for 60 h, the preparation of the structural adhesive tape is completed.
  • the adhesive layer of the structural adhesive tape is pasted on the blank current collector aluminum foil, the positive electrode slurry is coated on the current collector, and then placed in an oven to heat the foaming agent particles cyclopentane, and the structural adhesive paper is curled. After the positive slurry layer is completely dried, the current collector is removed from the oven, and the structural adhesive tape is peeled off by a mechanical brush to form a reserved area of the tab.
  • Table 3 gives the test results of the parallel test, and the result of the structural adhesive tape sticking to the current collector is as follows: 10% of the structural adhesive paper is unevenly attached, wherein the ratio of the oblique rubber is 3%, and the ratio of the wrinkles is 7%.
  • the slurry of the first adhesive layer was prepared by stirring the first adhesive acrylate type adhesive and toluene at a rotation speed of 40 rpm to 60 rpm for 30 minutes at room temperature.
  • the blowing agent particles cyclopentane (foaming temperature is 120 ° C ⁇ 130 ° C) are filtered through a 150 mesh sieve, and then stirred with a second adhesive acrylate adhesive, ethyl acetate at a speed of 40 rpm to 60 rpm.
  • a slurry of the second adhesive layer was prepared for 30 minutes, wherein the mass of the blowing agent particles was 25% of the sum of the masses of the second adhesive and the blowing agent particles.
  • the slurry of the second adhesive layer was coated on a substrate PET (thickness: 15 ⁇ m) by a doctor blade to form a roll I, and the roll I was heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate.
  • the roll I has a running speed of 10 m/min to 12 m/min, the slurry coating thickness is 40 ⁇ m, and a part of the blowing agent particles cyclopentane is exposed on the surface of the second adhesive layer away from the substrate PET.
  • the slurry forming material roll II of the first adhesive layer is disposed on the second adhesive layer of the roll I by gravure coating, and the roll II is heated to an oven temperature of 75 ° C for 2 min to remove Toluene, the roll speed of the roll II is from 10 m/min to 12 m/min, and the thickness of the slurry coating is 5 ⁇ m, so that the above-mentioned foaming agent particles cyclopentane exposed on the surface of the second adhesive layer are embedded in the first adhesive.
  • the layer remains unexposed to the surface of the first adhesive layer away from the substrate PET.
  • the mixture was aged to 45 ° C for 60 h to complete the preparation of structural adhesive tape.
  • the first adhesive layer of the structural adhesive tape is pasted on the blank current collector aluminum foil, the positive electrode slurry is coated on the current collector, and then heated in an oven to foam the foaming agent particles cyclopentane, and the structural adhesive paper is curled. After the positive electrode slurry layer is completely dried, the current collector is removed from the oven, and the structural adhesive tape is peeled off by a mechanical brush to form a reserved area of the tab.
  • Table 4 gives the test results of the parallel test, and the result of the structural adhesive tape sticking on the current collector is that the 5% structural adhesive paper is unevenly attached, wherein the ratio of the oblique rubber is 1%, and the ratio of the wrinkles is 4%.
  • the structural adhesive paper of Comparative Example 1 was inferior in thickness consistency, and the adhesive consistency of the structural adhesive paper after foaming was also poor.
  • the thickness consistency of the structural adhesive paper in Comparative Example 2 was also poor, because in Comparative Example 2, the first adhesive layer bonded to the blank current collector was relatively thin, only 5 ⁇ m, and usually the blowing agent particles.
  • the particle size distribution itself is 5 ⁇ m to 30 ⁇ m, and since part of the foaming agent particles exposes the surface of the second adhesive layer away from the surface of the substrate PET, it is impossible to continue coating the slurry of the first adhesive layer thereon.
  • the flatness of the first adhesive layer is ensured, and thus the bonding surface of the structural adhesive tape cannot be ensured, and the consistency of the thickness of the structural adhesive tape is not guaranteed. If the thickness of the first adhesive layer is increased, the foaming agent particles are not exposed after being foamed, which tends to cause the structural adhesive tape to be easily peeled off, and a residual glue is formed on the current collector.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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Abstract

La présente invention concerne un papier adhésif structural et un procédé de préparation associé. Le papier adhésif structural comprend une première couche adhésive, fixée sur un film antiadhésif ; un substrat, situé sur une face de la première couche adhésive qui est éloignée du film antiadhésif ; et une seconde couche adhésive, qui est située entre la première couche adhésive et le substrat et qui comprend un second adhésif. La première couche adhésive comprend : un premier adhésif, ainsi que des particules d'un agent d'expansion, réparties sur le premier adhésif. La surface de la première couche adhésive qui est éloignée du film antiadhésif est une première surface, et une surface de la première couche adhésive qui est proche du film antiadhésif est une seconde surface. Quelques-unes des particules de l'agent d'expansion sont exposées à partir de la première surface et incorporées dans la seconde couche adhésive, et la seconde surface de la première couche adhésive est fixée au film antiadhésif. Le papier adhésif structural présente les avantages d'une surface plane, d'une épaisseur constante et d'une adhérence aisée à des objets à coller. Le papier adhésif structural présente une adhésivité très constante aux objets à coller, et est aisément produit en série.
PCT/CN2016/102556 2016-10-19 2016-10-19 Papier adhésif structural et procédé de préparation associé Ceased WO2018072137A1 (fr)

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CN115181519A (zh) * 2022-08-08 2022-10-14 新纶新能源材料(常州)有限公司 一种铝塑膜内层胶黏剂及其制备方法和在铝塑膜中的应用
WO2025097354A1 (fr) * 2023-11-09 2025-05-15 简单绿能股份有限公司 Matériau de libération et son procédé de formation
US12403437B2 (en) 2019-03-26 2025-09-02 Daicel Corporation Method for producing nanodiamonds doped with group 14 element, and method for purifying same

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CN101815768A (zh) * 2007-10-09 2010-08-25 粘合剂研究股份有限公司 多孔的压敏性粘合剂和粘合带
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CN1511185A (zh) * 2001-06-04 2004-07-07 具有脱离特性的粘性硅橡胶
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Publication number Priority date Publication date Assignee Title
US12403437B2 (en) 2019-03-26 2025-09-02 Daicel Corporation Method for producing nanodiamonds doped with group 14 element, and method for purifying same
CN115181519A (zh) * 2022-08-08 2022-10-14 新纶新能源材料(常州)有限公司 一种铝塑膜内层胶黏剂及其制备方法和在铝塑膜中的应用
CN115181519B (zh) * 2022-08-08 2024-03-19 新纶新能源材料(常州)有限公司 一种铝塑膜内层胶黏剂及其制备方法和在铝塑膜中的应用
WO2025097354A1 (fr) * 2023-11-09 2025-05-15 简单绿能股份有限公司 Matériau de libération et son procédé de formation

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