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WO2018072137A1 - 结构胶纸及其制备方法 - Google Patents

结构胶纸及其制备方法 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
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WO
WIPO (PCT)
Prior art keywords
adhesive
adhesive layer
structural
release film
agent particles
Prior art date
Application number
PCT/CN2016/102556
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English (en)
French (fr)
Inventor
戴志芳
龙海
陶兴华
张盛武
Original Assignee
宁德新能源科技有限公司
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Priority to PCT/CN2016/102556 priority Critical patent/WO2018072137A1/zh
Publication of WO2018072137A1 publication Critical patent/WO2018072137A1/zh

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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)
  • Adhesive Tapes (AREA)
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Abstract

本发明提供一种结构胶纸及其制备方法。所述结构胶纸包括：第一胶黏剂层，贴附在离型膜上；基材，位于第一胶黏剂层的远离离型膜的一侧；以及第二胶黏剂层，位于第一胶黏剂层与基材之间且包括第二胶黏剂。第一胶黏剂层包括：第一胶黏剂；以及发泡剂颗粒，分布于第一胶黏剂。第一胶黏剂层的远离离型膜的表面为第一表面，第一胶黏剂层的靠近离型膜的表面为第二表面。部分发泡剂颗粒露出于第一表面并嵌入至第二胶黏剂层，且第一胶黏剂层的第二表面与离型膜贴附。所述结构胶纸的表面平整，厚度一致性好，易于粘贴在被粘结对象上，所述结构胶纸与被粘结对象的粘性一致性极高，易于进行批量化生产。

Description

结构胶纸及其制备方法 技术领域
本发明涉及胶纸领域，尤其涉及一种结构胶纸及其制备方法。
背景技术
现有技术的胶纸一般采用PET基材和丙烯酸酯系压敏型胶黏剂加发泡剂颗粒实现发泡从而与空白集流体(未涂布电极浆料的集流体)产生剥离，以在空白集流体上预留出极耳空位。参照图8A和图8B，当胶黏剂层2＇的残余溶剂量过大时(>10％)，发泡剂颗粒21＇被完全包覆在胶黏剂中，即使发泡剂颗粒21＇发泡后膨胀，也无法有效减小胶黏剂与空白集流体的接触面积，导致胶纸难以剥离，无法在空白集流体上预留出极耳空位。参照图9A和图9B，当胶黏剂层2＇的残余溶剂量相对合适时(5％～10％)，部分发泡剂颗粒21＇挨着胶黏剂与空白集流体之间的界面，发泡剂颗粒21＇发泡后可以有效减小胶黏剂与空白集流体的接触面积，胶纸可以正常剥离，但是该工艺要求苛刻，合格率较低，无法满足批量化生产的需求。参照图10A和图10B，当胶黏剂层2＇的残余溶剂量过低时(<5％)，大多数发泡剂颗粒21＇已经裸露在胶黏剂之外，发泡剂颗粒21＇发泡后，胶黏剂几乎与空白集流体失去粘结，导致胶纸失粘，污染烘箱。
另外，由于胶黏剂层中的发泡剂颗粒露出，导致胶黏剂层与空白集流体的粘结界面不平整，而胶黏剂层的厚度通常要求范围较小，常规的涂布工艺精度无法满足要求，厚度波动导致大量产品报废。
发明内容
鉴于背景技术中存在的问题，本发明的一目的在于提供一种结构胶纸及其制备方法，所述结构胶纸的表面平整，厚度一致性好，易于粘贴在被粘结对象上。
本发明的另一目的在于提供一种结构胶纸及其制备方法，所述结构胶纸 与被粘结对象的粘性一致性极高，易于进行批量化生产，解决了常规胶纸中发泡剂颗粒发泡后粘性波动严重的问题。
本发明的又一目的在于提供一种结构胶纸及其制备方法，所述结构胶纸能提升电池活性物质的利用率、避免活性物质的浪费，同时提升电池的能量密度、快冲快放性能以及散热性能。
为了达到上述目的，在本发明的一方面，本发明提供了一种结构胶纸，其包括：第一胶黏剂层，贴附在离型膜上；基材，位于第一胶黏剂层的远离离型膜的一侧；以及第二胶黏剂层，位于第一胶黏剂层与基材之间且包括第二胶黏剂。第一胶黏剂层包括：第一胶黏剂；以及发泡剂颗粒，分布于第一胶黏剂，且发泡剂颗粒的质量为第一胶黏剂和发泡剂颗粒的质量之和的20％～70％。第一胶黏剂层的远离离型膜的表面为第一表面，第一胶黏剂层的靠近离型膜的表面为第二表面。部分发泡剂颗粒露出于第一表面并嵌入至第二胶黏剂层，且第一胶黏剂层的第二表面与离型膜贴附。
在本发明的另一方面，本发明提供了一种结构胶纸的制备方法，其用于制备本发明一方面所述的结构胶纸，包括步骤：将第一胶黏剂、发泡剂颗粒以及第一溶剂搅拌制成第一胶黏剂层的浆料，将第一胶黏剂层的浆料涂布在离型膜上，其中，第一胶黏剂层的远离离型膜的表面为第一表面，第一胶黏剂层的靠近离型膜的表面为第二表面，加热至第一温度进行烘干以除去第一溶剂，并使部分发泡剂颗粒露出于第一胶黏剂层的远离离型膜的第一表面，第一胶黏剂层的靠近离型膜的第二表面保持与离型膜贴合，其中，所述第一温度低于发泡剂颗粒的发泡温度，发泡剂颗粒的质量为第一胶黏剂和发泡剂颗粒的质量之和的20％～70％；将第二胶黏剂以及第二溶剂搅拌制成第二胶黏剂层的浆料，将第二胶黏剂层的浆料涂布在基材上，加热至第二温度进行烘干以除去第二溶剂；将第一胶黏剂层的远离离型膜的第一表面与第二胶黏剂层的远离基材的表面加压复合并加热至第三温度进行熟化，所述第三温度低于发泡剂颗粒的发泡温度，即完成结构胶纸的制备。
相对于现有技术，本发明的有益效果为：
本发明的结构胶纸的表面平整，厚度一致性好，易于粘贴在被粘结对象上。
本发明的结构胶纸与被粘结对象的粘性一致性极高，易于进行批量化生 产，解决了常规胶纸中发泡剂颗粒发泡后粘性波动严重的问题。
本发明的结构胶纸能提升电池活性物质的利用率、避免活性物质的浪费，同时提升电池的能量密度、快冲快放性能以及散热性能。
附图说明
图1为本发明的结构胶纸所应用的被粘结对象集流体的立体图；
图2为本发明的结构胶纸粘贴于被粘结对象集流体的立体图，其中，结构胶纸的离型膜被剥离；
图3为本发明的结构胶纸涂布电极浆料的立体图，其中，结构胶纸的离型膜被剥离；
图4为本发明的结构胶纸剥离后的立体图；
图5为本发明的结构胶纸的一立体图；
图6为图5的一前视图；
图7为本发明的结构胶纸的加压复合示意图；
图8A至图8B为现有技术的胶纸的一实施例的一示意图，其中，图8A示出发泡剂颗粒发泡前的示意图，图8B示出发泡剂颗粒发泡后的示意图；
图9A至图9B为现有技术的胶纸的另一实施例的一示意图，其中，图9A示出发泡剂颗粒发泡前的示意图，图9B示出发泡剂颗粒发泡后的示意图；
图10A至图10B为现有技术的胶纸的又一实施例的一示意图，其中，图10A示出发泡剂颗粒发泡前的示意图，图10B示出发泡剂颗粒发泡后的示意图。
其中，附图标记说明如下：
1  结构胶纸
11  第一胶黏剂层
111  发泡剂颗粒
11S1  第一表面
11S2  第二表面
12  第二胶黏剂层
13  基材
M  离型膜
2  集流体
21  预留区域
3  电极浆料
W  宽度方向
L  长度方向
T  厚度方向
1＇  基材
2＇  胶黏剂层
21＇  发泡剂颗粒
具体实施方式
下面详细说明根据本发明的结构胶纸及其制备方法。
首先说明根据本发明第一方面的结构胶纸。
参照图3、图5至图6，根据本发明第一方面的结构胶纸1包括：第一胶黏剂层11，贴附在离型膜M上；基材13，位于第一胶黏剂层11的远离离型膜M的一侧；以及第二胶黏剂层12，位于第一胶黏剂层11与基材13之间且包括第二胶黏剂。第一胶黏剂层11包括：第一胶黏剂；以及发泡剂颗粒111，分布于第一胶黏剂，且发泡剂颗粒111的质量为第一胶黏剂和发泡剂颗粒111的质量之和的20％～70％。第一胶黏剂层11的远离离型膜的表面为第一表面11S1，第一胶黏剂层11的靠近离型膜的表面为第二表面11S2。部分发泡剂颗粒111露出于第一表面11S1并嵌入至第二胶黏剂层12，且第一胶黏剂层11的第二表面11S2与离型膜M贴附。
在根据本发明第一方面所述的结构胶纸1中，发泡剂颗粒111的质量为第一胶黏剂和发泡剂颗粒111的质量之和的20％～70％，发泡剂颗粒111所占的质量百分含量过高，容易造成结构胶纸提早失粘，发泡剂颗粒111的质量百分含量过低，容易造成发泡不良。其中，发泡剂颗粒111的质量百分含量的下限值可为20％、25％、30％，发泡剂颗粒111的质量百分含量的下限值可为30％、35％、40％、45％、50％、55％、60％、65％、70％。优选地，发泡剂颗粒111的质量为第一胶黏剂和发泡剂颗粒111的质量之和的 25％～35％。
在根据本发明第一方面所述的结构胶纸1中，第二胶黏剂层12不含发泡剂颗粒。
在根据本发明第一方面所述的结构胶纸1中，第一胶黏剂层11的厚度为40μm～50μm。
在根据本发明第一方面所述的结构胶纸1中，第二胶黏剂层12的厚度为4μm～10μm。
在根据本发明第一方面所述的结构胶纸1中，所述第一胶黏剂选自丙烯酸酯型胶黏剂、聚氨酯胶黏剂中的一种或几种。
在根据本发明第一方面所述的结构胶纸1中，所述第二胶黏剂选自丙烯酸酯型胶黏剂、聚氨酯胶黏剂中的一种或几种。
在根据本发明第一方面所述的结构胶纸1中，第一胶黏剂与第二胶黏剂的材质可不同。
在根据本发明第一方面所述的结构胶纸1中，基材13的厚度为15μm～36μm。
在根据本发明第一方面所述的结构胶纸1中，基材13选自聚对苯二甲酸乙二醇酯(PET)。
在根据本发明第一方面所述的结构胶纸1中，发泡剂颗粒111的粒径为5μm～30μm。
在根据本发明第一方面所述的结构胶纸1中，发泡剂颗粒111为物理发泡剂和/或化学发泡剂。所述物理发泡剂为烷烃类长链系列发泡剂。优选地，所述物理发泡剂选自异戊烷发泡剂、异丁烷发泡剂、环戊烷发泡剂中的一种或几种。所述化学发泡剂选自偶氮二甲酰胺、偶氮二异丁腈、N,N-二亚硝基五次甲基四胺、4,4'-氧代双苯磺酰肼、对甲苯磺酰肼中的一种或几种。
在根据本发明第一方面所述的结构胶纸1中，第一胶黏剂层11和/或第二胶黏剂层12还包括固化剂。第一胶黏剂层11中的固化剂与第二胶黏剂层12中的固化剂可以相同，也可以不同。
在根据本发明第一方面所述的结构胶纸1中，所述固化剂可为室温固化剂。优选地，所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺(优选为低分子量聚酰胺)、改性芳胺、异氰酸酯中的一种或几种。
在根据本发明第一方面所述的结构胶纸1中，优选地，离型膜M可为涂覆硅油的PET膜。
在根据本发明第一方面所述的结构胶纸1中，使用结构胶纸1时，将结构胶纸1中的离型膜M剥离，露出的第一胶黏剂层11用于粘贴在被粘结对象上。
参照图1至图4，在根据本发明第一方面所述的结构胶纸1中，被粘结对象可为空白集流体2，在空白集流体2上涂布电极浆料3之前，将结构胶纸1中的离型膜M剥离，并将结构胶纸1的第一胶黏剂层11粘贴于空白集流体2的形成极耳的预留区域21处，当在空白集流体2上涂布电极浆料3之后对电极浆料3进行烘干，烘干完成后，剥离结构胶纸1，形成极耳的预留区域21。
其次说明根据本发明第二方面的结构胶纸的制备方法。
参照图7，根据本发明第二方面的结构胶纸的制备方法用于制备本发明第一方面所述的结构胶纸1，包括步骤：将第一胶黏剂、发泡剂颗粒111以及第一溶剂搅拌制成第一胶黏剂层11的浆料，将第一胶黏剂层11的浆料涂布在离型膜M上，其中，第一胶黏剂层11的远离离型膜M的表面为第一表面11S1，第一胶黏剂层11的靠近离型膜M的表面为第二表面11S2，加热至第一温度进行烘干以除去第一溶剂，并使部分发泡剂颗粒111露出于第一胶黏剂层11的远离离型膜M的第一表面11S1，第一胶黏剂层11的靠近离型膜M的第二表面11S2保持与离型膜M贴合，其中，所述第一温度低于发泡剂颗粒111的发泡温度，且发泡剂颗粒111的质量为第一胶黏剂和发泡剂颗粒111的质量之和的20％～70％；将第二胶黏剂以及第二溶剂搅拌制成第二胶黏剂层12的浆料，将第二胶黏剂层12的浆料涂布在基材13上，加热至第二温度进行烘干以除去第二溶剂；将第一胶黏剂层11的远离离型膜M的第一表面11S1与第二胶黏剂层12的远离基材13的表面加压复合并加热至第三温度进行熟化，所述第三温度低于发泡剂颗粒111的发泡温度，即完成结构胶纸1的制备。
在根据本发明第二方面所述的结构胶纸1的制备方法中，加热至第一温度进行烘干除去第一溶剂时使部分发泡剂颗粒111露出于第一胶黏剂层11 的远离离型膜M的第一表面11S1，第一胶黏剂层11的靠近离型膜M的第二表面11S2由于与离型膜M保持贴合，因此当离型膜M剥离后，第一胶黏剂层11的第二表面11S2保持平整，使得结构胶纸1的厚度一致性好，易于粘贴在被粘结对象上。且同时由于烘干使得第一表面11S1附近的部分发泡剂颗粒111露出，因此尽管第二表面11S2附近的发泡剂颗粒111由于存在离型膜M的缘故未露出，但是在结构胶纸1的使用过程中(离型膜M剥离，露出的第一胶黏剂层11用于粘贴在被粘结对象上，诸如粘贴在图1的集流体2上)，发泡剂颗粒111发泡后极易突破第一胶黏剂层11的第二表面11S2，结构胶纸1与被粘结对象既不完全脱离，也不完全贴附，使得结构胶纸1易于从被粘结对象剥离，发泡后结构胶纸1的粘性一致性良好，不会出现发泡不良和残胶。
在根据本发明第二方面所述的结构胶纸1的制备方法中，加热至第一温度进行烘干除去第一溶剂后，第一溶剂的残余量占第一胶黏剂层11的浆料的总重量的比例不大于1％。
在根据本发明第二方面所述的结构胶纸1的制备方法中，加热至第二温度进行烘干除去第二溶剂后，第二溶剂的残余量占第二胶黏剂层12的浆料的总重量的比例不大于1％。
在根据本发明第二方面所述的结构胶纸1的制备方法中，第一温度为75℃～85℃，烘烤时间不小于2min。
在根据本发明第二方面所述的结构胶纸1的制备方法中，第二温度为75℃～85℃，烘烤时间不小于1min。
在根据本发明第二方面所述的结构胶纸1的制备方法中，第三温度为40℃～45℃，熟化时间48h～72h。
在根据本发明第二方面所述的结构胶纸1的制备方法中，第一胶黏剂层11的浆料的涂布方式选自挤压涂布、刮刀涂布、喷涂或转移涂布。
在根据本发明第二方面所述的结构胶纸1的制备方法中，第二胶黏剂层12的浆料的涂布方式选自挤压涂布、刮刀涂布、喷涂或转移涂布。
在根据本发明第二方面所述的结构胶纸1的制备方法中，将第一胶黏剂层11的远离离型膜M的第一表面11S1与第二胶黏剂层12的远离基材13的表面在5kg～12kg压力下复合。
在根据本发明第二方面所述的结构胶纸1的制备方法中，可将第一胶黏剂层11的远离离型膜M的第一表面11S1与第二胶黏剂层12的远离基材13的表面先加压复合，之后加热至第三温度进行熟化；或可将第一胶黏剂层11的远离离型膜M的第一表面11S1与第二胶黏剂层12的远离基材13的表面边加压复合边加热至第三温度进行熟化。
下面结合实施例，进一步阐述本申请。应理解，这些实施例仅用于说明本申请而不用于限制本申请的范围。
实施例1
室温下，将第一胶黏剂丙烯酸酯型胶黏剂、发泡剂颗粒环戊烷(采用150目筛子过滤，发泡温度为120℃～130℃)以及乙酸乙酯在40rpm～60rpm转速下搅拌30min制成第一胶黏剂层的浆料，其中，发泡剂颗粒的质量为第一胶黏剂和发泡剂颗粒的质量之和的25％。将第一胶黏剂层的浆料采用刮刀涂布在离型膜上生成料卷Ⅰ，将料卷Ⅰ加热至烘箱温度为75℃烘干2min以除去乙酸乙酯(残余量不大于1％)，料卷Ⅰ走速为10m/min～12m/min，浆料涂布厚度为40μm，并使部分发泡剂颗粒环戊烷露出于第一胶黏剂层的远离离型膜的第一表面，第一胶黏剂层的靠近离型膜的第二表面保持与离型膜贴合。
将第二胶黏剂丙烯酸酯型胶黏剂以及甲苯在40rpm～60rpm转速下搅拌30min制成第二胶黏剂层的浆料。将第二胶黏剂层的浆料采用刮刀涂布在基材PET(厚度为15μm)上生成料卷Ⅱ，将料卷Ⅱ加热至烘箱温度为75℃烘干2min以除去甲苯(残余量不大于1％)，料卷Ⅱ走速为10m/min～12m/min，浆料涂布厚度为5μm。
将料卷Ⅰ中第一胶黏剂层的远离离型膜的第一表面与料卷Ⅱ中第二胶黏剂层的远离基材的表面在6kg压力下复合，复合速度为5m/min～45m/min，之后加热至45℃熟化60h，即完成结构胶纸的制备。
剥离离型膜，将结构胶纸的第一胶黏剂层粘贴在空白集流体铝箔上，将正极浆料涂布在集流体上，之后置于烘箱加热使发泡剂颗粒环戊烷发泡，结构胶纸卷曲，待正极浆料层干燥完全后，将集流体从烘箱移除，通过机械毛 刷剥离结构胶纸，即形成极耳的预留区域。
表1给出平行测试的测试结果，且结构胶纸粘贴在集流体上使贴附平整，无斜胶、无贴皱出现。
表1  实施例1的结构胶纸的厚度以及发泡后的粘性结果
Figure PCTCN2016102556-appb-000001
实施例2
室温下，将第一胶黏剂丙烯酸酯型胶黏剂、发泡剂颗粒环戊烷(采用150目筛子过滤，发泡温度为120℃～130℃)以及乙酸乙酯在40rpm～60rpm转速下搅拌30min制成第一胶黏剂层的浆料，其中，发泡剂颗粒的质量为第一胶黏剂和发泡剂颗粒的质量之和的60％。将第一胶黏剂层的浆料采用刮刀涂布在离型膜上生成料卷Ⅰ，将料卷Ⅰ加热至烘箱温度为75℃烘干2min以除去乙酸乙酯(残余量不大于1％)，料卷Ⅰ走速为10m/min～12m/min，浆料涂布厚度为50μm，并使部分发泡剂颗粒环戊烷露出于第一胶黏剂层的远离离型膜的第一表面，第一胶黏剂层的靠近离型膜的第二表面保持与离型膜贴合。
将第二胶黏剂丙烯酸酯型胶黏剂以及甲苯在40rpm～60rpm转速下搅拌30min制成第二胶黏剂层的浆料。将第二胶黏剂层的浆料采用刮刀涂布在基材PET(厚度为15μm)上生成料卷Ⅱ，将料卷Ⅱ加热至烘箱温度为75℃烘干2min以除去甲苯(残余量不大于1％)，料卷Ⅱ走速为10m/min～12m/min，浆料涂布厚度为5μm。
将料卷Ⅰ中第一胶黏剂层的远离离型膜的第一表面与料卷Ⅱ中第二胶黏剂层的远离基材的表面在6kg压力下复合，复合速度为5m/min～45m/min，之后加热至45℃熟化60h，即完成结构胶纸的制备。
剥离离型膜，将结构胶纸的第一胶黏剂层粘贴在空白集流体铝箔上，将正极浆料涂布在集流体上，之后置于烘箱加热使发泡剂颗粒环戊烷发泡，结 构胶纸卷曲，待正极浆料层干燥完全后，将集流体从烘箱移除，通过机械毛刷剥离结构胶纸，即形成极耳的预留区域。
表2给出平行测试的测试结果，且结构胶纸粘贴在集流体上使贴附平整，无斜胶、无贴皱出现。
表2  实施例2的结构胶纸的厚度以及发泡后的粘性结果
Figure PCTCN2016102556-appb-000002
对比例1
室温下，将胶黏剂丙烯酸酯型胶黏剂、发泡剂颗粒环戊烷(采用150目筛子过滤，发泡温度为120℃～130℃)以及乙酸乙酯在40rpm～60rpm转速下搅拌30min制成浆料，其中，发泡剂颗粒的质量为胶黏剂和发泡剂颗粒的质量之和的25％。将浆料采用刮刀涂布在基材PET(厚度为15μm)上生成料卷，将料卷加热至烘箱温度为75℃烘干2min以除去乙酸乙酯，料卷走速为10m/min～12m/min，浆料涂布厚度为50μm。之后加热至45℃熟化60h，即完成结构胶纸的制备。
将结构胶纸的胶黏剂层粘贴在空白集流体铝箔上，将正极浆料涂布在集流体上，之后置于烘箱加热使发泡剂颗粒环戊烷发泡，结构胶纸卷曲，待正极浆料层干燥完全后，将集流体从烘箱移除，通过机械毛刷剥离结构胶纸，即形成极耳的预留区域。
表3给出平行测试的测试结果，且结构胶纸粘贴在集流体上的结果为：10％结构胶纸贴附不平整，其中斜胶比例为3％、贴皱比例为7％。
表3  对比例1的结构胶纸的厚度以及发泡后的粘性结果
Figure PCTCN2016102556-appb-000003
Figure PCTCN2016102556-appb-000004
对比例2
室温环境下，将第一胶黏剂丙烯酸酯型胶黏剂以及甲苯在40rpm～60rpm的转速下搅拌30min制成第一胶黏剂层的浆料。将发泡剂颗粒环戊烷(发泡温度为120℃～130℃)采用150目筛子过滤，之后与第二胶黏剂丙烯酸酯型胶黏剂、乙酸乙酯在40rpm～60rpm的转速下搅拌30min制成第二胶黏剂层的浆料，其中，发泡剂颗粒的质量为第二胶黏剂和发泡剂颗粒的质量之和的25％。
将第二胶黏剂层的浆料采用刮刀涂布在基材PET(厚度为15μm)上生成料卷Ⅰ，将料卷Ⅰ加热至烘箱温度为75℃烘干2min以除去乙酸乙酯，料卷Ⅰ走速为10m/min～12m/min，浆料涂布厚度为40μm，并使部分发泡剂颗粒环戊烷露出于第二胶黏剂层的远离基材PET的表面。
之后在料卷Ⅰ的第二胶黏剂层上采用凹版涂布的方式设置第一胶黏剂层的浆料生成料卷Ⅱ，将料卷Ⅱ加热至烘箱温度为75℃烘干2min以除去甲苯，料卷Ⅱ走速为10m/min～12m/min，浆料涂布厚度为5μm，使上述露出于第二胶黏剂层的表面的发泡剂颗粒环戊烷嵌入第一胶黏剂层且保持未露出于第一胶黏剂层的远离基材PET的表面。
加热至45℃熟化60h，完成结构胶纸的制备。
将结构胶纸的第一胶黏剂层粘贴在空白集流体铝箔上，将正极浆料涂布在集流体上，之后置于烘箱加热使发泡剂颗粒环戊烷发泡，结构胶纸卷曲，待正极浆料层干燥完全后，将集流体从烘箱移除，通过机械毛刷剥离结构胶纸，即形成极耳的预留区域。
表4给出平行测试的测试结果，且结构胶纸粘贴在集流体上的结果为：5％结构胶纸贴附不平整，其中斜胶比例为1％、贴皱比例为4％。
表4  对比例2的结构胶纸的厚度以及发泡后的粘性结果
Figure PCTCN2016102556-appb-000005
Figure PCTCN2016102556-appb-000006
与实施例1-2相比，对比例1的结构胶纸的厚度一致性较差，且结构胶纸发泡后的粘性一致性也较差。对比例2中结构胶纸的厚度一致性也较差，这是由于在对比例2中，与空白集流体粘结的第一胶黏剂层比较薄，仅为5μm，而通常发泡剂颗粒本身粒径分布为5μm～30μm，且由于部分发泡剂颗粒露出第二胶黏剂层的远离基材PET的表面，导致在其上继续涂布第一胶黏剂层的浆料时，无法保证第一胶黏剂层的平整度，进而无法保证结构胶纸的粘结面的平整，同时结构胶纸的厚度的一致性也得不到保证。如果增加第一胶黏剂层的厚度又无法保证发泡剂颗粒发泡后露出，容易导致结构胶纸不易剥离，在集流体上形成残胶。

Claims (22)

  1. 一种结构胶纸(1)，其特征在于，包括：
    第一胶黏剂层(11)，贴附在离型膜(M)上，包括：
    第一胶黏剂；以及
    发泡剂颗粒(111)，分布于第一胶黏剂，且发泡剂颗粒(111)的质量为第一胶黏剂和发泡剂颗粒(111)的质量之和的20％～70％；
    基材(13)，位于第一胶黏剂层(11)的远离离型膜(M)的一侧；以及
    第二胶黏剂层(12)，位于第一胶黏剂层(11)与基材(13)之间且包括第二胶黏剂；
    第一胶黏剂层(11)的远离离型膜(M)的表面为第一表面(11S1)，第一胶黏剂层(11)的靠近离型膜(M)的表面为第二表面(11S2)，部分发泡剂颗粒(111)露出于第一表面(11S1)并嵌入至第二胶黏剂层(12)，且第一胶黏剂层(11)的第二表面(11S2)与离型膜(M)贴附。
  2. 根据权利要求1所述的结构胶纸(1)，其特征在于，发泡剂颗粒(111)的质量为第一胶黏剂和发泡剂颗粒(111)的质量之和的25％～35％。
  3. 根据权利要求1所述的结构胶纸(1)，其特征在于，第一胶黏剂层(11)的厚度为40μm～50μm。
  4. 根据权利要求1所述的结构胶纸(1)，其特征在于，第二胶黏剂层(12)的厚度为4μm～10μm。
  5. 根据权利要求1所述的结构胶纸(1)，其特征在于，所述第一胶黏剂选自丙烯酸酯型胶黏剂、聚氨酯胶黏剂中的一种或几种；所述第二胶黏剂选自丙烯酸酯型胶黏剂、聚氨酯胶黏剂中的一种或几种。
  6. 根据权利要求1所述的结构胶纸(1)，其特征在于，第一胶黏剂与第 二胶黏剂的材质不同。
  7. 根据权利要求1所述的结构胶纸(1)，其特征在于，基材(13)的厚度为15μm～36μm。
  8. 根据权利要求1所述的结构胶纸(1)，其特征在于，基材(13)选自聚对苯二甲酸乙二醇酯。
  9. 根据权利要求1所述的结构胶纸(1)，其特征在于，发泡剂颗粒(111)的粒径为5μm～30μm。
  10. 根据权利要求9所述的结构胶纸(1)，其特征在于，发泡剂颗粒(111)为物理发泡剂和/或化学发泡剂。
  11. 根据权利要求10所述的结构胶纸(1)，其特征在于，
    所述物理发泡剂选自异戊烷发泡剂、异丁烷发泡剂、环戊烷发泡剂中的一种或几种；
    所述化学发泡剂选自偶氮二甲酰胺、偶氮二异丁腈、N,N-二亚硝基五次甲基四胺、4,4'-氧代双苯磺酰肼、对甲苯磺酰肼中的一种或几种。
  12. 根据权利要求1所述的结构胶纸(1)，其特征在于，第一胶黏剂层(11)和/或第二胶黏剂层(12)还包括固化剂。
  13. 根据权利要求12所述的结构胶纸(1)，其特征在于，所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺、改性芳胺、异氰酸酯中的一种或几种。
  14. 一种结构胶纸(1)的制备方法，用于制备权利要求1-13中任一项所述的结构胶纸(1)，包括步骤：
    将第一胶黏剂、发泡剂颗粒(111)以及第一溶剂搅拌制成第一胶黏剂层(11)的浆料，将第一胶黏剂层(11)的浆料涂布在离型膜(M)上，其 中，第一胶黏剂层(11)的远离离型膜(M)的表面为第一表面(11S1)，第一胶黏剂层(11)的靠近离型膜(M)的表面为第二表面(11S2)，加热至第一温度进行烘干以除去第一溶剂，并使部分发泡剂颗粒(111)露出于第一胶黏剂层(11)的远离离型膜(M)的第一表面(11S1)，第一胶黏剂层(11)的靠近离型膜(M)的第二表面(11S2)保持与离型膜(M)贴合，其中，所述第一温度低于发泡剂颗粒(111)的发泡温度，发泡剂颗粒(111)的质量为第一胶黏剂和发泡剂颗粒(111)的质量之和的20％～70％；
    将第二胶黏剂以及第二溶剂搅拌制成第二胶黏剂层(12)的浆料，将第二胶黏剂层(12)的浆料涂布在基材(13)上，加热至第二温度进行烘干以除去第二溶剂；
    将第一胶黏剂层(11)的远离离型膜(M)的第一表面(11S1)与第二胶黏剂层(12)的远离基材(13)的表面加压复合并加热至第三温度进行熟化，所述第三温度低于发泡剂颗粒(111)的发泡温度，即完成结构胶纸(1)的制备。
  15. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，加热至第一温度进行烘干除去第一溶剂后，第一溶剂的残余量占第一胶黏剂层(11)的浆料的总重量的比例不大于1％。
  16. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，加热至第二温度进行烘干除去第二溶剂后，第二溶剂的残余量占第二胶黏剂层(12)的浆料的总重量的比例不大于1％。
  17. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，第一温度为75℃～85℃。
  18. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，第二温度为75℃～85℃。
  19. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，第 三温度为40℃～45℃。
  20. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，第一胶黏剂层(11)的浆料的涂布方式选自挤压涂布、刮刀涂布、喷涂或转移涂布。
  21. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，第二胶黏剂层(12)的浆料的涂布方式选自挤压涂布、刮刀涂布、喷涂或转移涂布。
  22. 根据权利要求14所述的结构胶纸(1)的制备方法，其特征在于，将第一胶黏剂层(11)的远离离型膜(M)的第一表面(11S1)与第二胶黏剂层(12)的远离基材(13)的表面在5kg～12kg压力下复合。
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CN104371610A (zh) * 2014-12-03 2015-02-25 新丰杰力电工材料有限公司 热剥离丙烯酸酯压敏胶粘剂的制备方法及其应用

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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
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 (zh) * 2023-11-09 2025-05-15 简单绿能股份有限公司 一种离型材料及其成形方法

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