WO2018072138A1 - Method for fabricating structural adhesive paper - Google Patents

Method for fabricating structural adhesive paper Download PDF

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Publication number
WO2018072138A1
WO2018072138A1 PCT/CN2016/102557 CN2016102557W WO2018072138A1 WO 2018072138 A1 WO2018072138 A1 WO 2018072138A1 CN 2016102557 W CN2016102557 W CN 2016102557W WO 2018072138 A1 WO2018072138 A1 WO 2018072138A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
structural adhesive
adhesive tape
tape according
structural
Prior art date
Application number
PCT/CN2016/102557
Other languages
French (fr)
Chinese (zh)
Inventor
戴志芳
龙海
陶兴华
张盛武
谢斌
Original Assignee
宁德新能源科技有限公司
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Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to PCT/CN2016/102557 priority Critical patent/WO2018072138A1/en
Publication of WO2018072138A1 publication Critical patent/WO2018072138A1/en

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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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the field of adhesive tape, in particular to a preparation method of structural adhesive tape.
  • the active material on the positive and negative electrode sheets is often removed by a laser cleaning method to expose a predetermined area for soldering the ear on the current collector.
  • the active material on the positive and negative electrode sheets is cleaned by a laser, there are cases where pinholes, burrs, and active materials remain, which causes the secondary battery to be easily short-circuited, and there is also a problem of disconnection caused by the falling of the ear.
  • the structural adhesive tape is generally foamed by a PET substrate and an acrylate-based pressure-sensitive adhesive plus a foaming agent to cause peeling from the current collector to form a reserved region of the welding tab at the current collector.
  • the thickness of the adhesive layer between the foaming agent particles and the current collector near the current collector determines the amount of adhesion between the structural adhesive paper and the current collector. The greater the thickness, the greater the adhesion. Big.
  • the method of preserving the tab area using the current structural adhesive paper has two extremes of premature adhesive loss and poor peeling of the structural adhesive tape. How to avoid the above problems is the current research problem in the field.
  • an object of the present invention is to provide a method for preparing a structural adhesive tape, which can effectively reduce the premature loss of adhesion and non-peeling of the structural adhesive tape, and effectively reduce the preparation process of the structural adhesive tape. The chance of a broken band.
  • the present invention provides a method for preparing a structural adhesive tape, comprising the steps of: stirring a first adhesive, a foaming agent particle, and a first solvent into a first adhesive; a slurry of the adhesive layer, coating the slurry of the first adhesive layer on the first substrate, heating to a first temperature for drying to remove the first solvent, the first temperature being lower than the blowing agent
  • the second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer, the slurry of the second adhesive layer is coated on the second substrate, and heated to a second temperature for drying To remove the second solvent, to obtain a roll II; to add the surface of the first substrate away from the first adhesive layer in the roll I and the surface of the second adhesive layer in the roll II away from the second substrate Pressing and heating to a third temperature for aging, so that the second
  • the preparation method of the structural adhesive tape of the invention can effectively reduce the probability of premature loss of adhesion and non-peeling of the structural adhesive tape, and at the same time effectively reduce the probability of occurrence of breakage during the preparation of the structural adhesive tape.
  • Figure 1 is a perspective view of the structural adhesive tape of the present invention
  • Figure 2 is a cross-sectional view of the structural adhesive tape of the present invention taken along the position of the groove;
  • Figure 3 is a bottom plan view of the structural adhesive tape of the present invention.
  • Figure 4 is another bottom view of the structural adhesive tape of the present invention.
  • Figure 5 is another bottom view of the structural adhesive tape of the present invention.
  • Figure 6 is a flow chart showing the preparation of structural adhesive tape by the preparation method of the present invention.
  • Figure 7 is a flow chart for the preparation of structural adhesive tape using known preparation methods.
  • the structural adhesive tape of the present invention is shown in which a first adhesive layer 11, a first substrate 12, a second adhesive layer 21, and a second adhesive layer 21 are sequentially disposed in the thickness direction T from bottom to top.
  • the second substrate 22, the first adhesive layer 11 is for adhering to an object to be bonded, such as a current collector, and includes a first adhesive and blowing agent particles 111.
  • the first adhesive layer 11 and the first substrate 12 are provided with a groove R penetrating in the thickness direction T, and the groove R is filled with the slurry of the second adhesive layer 21.
  • the second adhesive layer 21 at the groove R does not contain the blowing agent particles, the blowing agent particles 111 in the first adhesive layer 11 can remain after being foamed.
  • the object to be bonded is bonded to ensure that the structural adhesive tape does not lose its viscosity after being out of the oven, avoiding the loss of stickiness of the structural adhesive tape, contaminating the oven, and ensuring that the structural adhesive tape is easily peeled off by the brush.
  • the method for preparing a structural adhesive tape comprises the steps of: stirring a first adhesive, a blowing agent particle 111, and a first solvent into a slurry of the first adhesive layer 11,
  • the slurry of the adhesive layer 11 is coated on the first substrate 12 (corresponding to the operation of step S11 in FIG. 6), heated to a first temperature for drying to remove the first solvent, and the first temperature is lower than the hair a foaming temperature of the foaming agent particles 111, and a groove R is formed in the first adhesive layer 11 and the first base material 12 in the thickness direction T (corresponding to the operation of step S13 in FIG.
  • step S31 in FIG. 6 The second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer 21, and the slurry of the second adhesive layer 21 is coated on the second substrate 22 (corresponding to step S21 in FIG. 6)
  • the operation is performed by heating to a second temperature for drying to remove the second solvent to obtain a roll II; and the surface of the first substrate 12 away from the first adhesive layer 11 and the roll II in the roll I
  • the surface of the second adhesive layer 21 away from the second substrate 22 is press-composited and heated to a third temperature for curing (corresponding to the operation of step S31 in FIG.
  • the release film M is attached to the other side of the slurry of the first adhesive layer 11 (corresponding to the operation of step S12 in FIG. 6), and then heated to the first temperature for drying. Remove the first solvent, then A groove R is formed in the first adhesive layer 11, the first substrate 12, and the release film M in the thickness direction T (corresponding to the operation of step S13 in FIG. 6), and then the release of the groove R is provided.
  • the film M was peeled off (corresponding to the operation of step S14 in Fig. 6) to obtain a roll I.
  • the surface of the first adhesive layer 11 is kept flat, so that the structural adhesive paper has a uniform thickness and is easily attached to the object to be bonded.
  • a new release film M (corresponding to the operation of step S15 in FIG. 6) may be reattached in situ to obtain a release film.
  • the roll I of M is used to facilitate the pressurization of the roll I and the roll II, and the release film M is peeled off after the final preparation of the structural adhesive tape.
  • step S41 can also be performed to obtain a structural adhesive sheet corresponding to the tab size.
  • the pressure of the press roll is applied, and the concave pressure is applied.
  • the roll II at the opening of the groove R is deformed so that the second adhesive layer 21 enters and fills the groove R, thereby ensuring contact with the object to be bonded, such as a current collector.
  • the method for preparing the structural adhesive paper according to the present invention can ensure that the second adhesive layer 21 is pressed into the groove R by deformation under pressure, thereby filling the full groove R to bond with the object to be bonded. Since the second adhesive layer 21 at the groove R does not contain the foaming agent particles, after the foaming agent particles 111 in the first adhesive layer 11 are foamed, the structural adhesive paper remains adhered to the object to be bonded. Sticking, reducing the chance of structural adhesive paper appearing prematurely. At the same time, after the foaming agent particles 111 in the first adhesive layer 11 are foamed, the first adhesive layer 11 loses adhesion with the object to be bonded, and only the second adhesive layer 21 at the groove R remains.
  • the adhesive material is bonded to the object to be bonded, so that the adhesive force between the structural adhesive tape and the object to be bonded is not excessively increased, and the structural adhesive tape after foaming is also easily peeled off from the object to be bonded.
  • the roll I and the roll II are press-compressed, since the second adhesive layer 21 has become solid, the size of the opening of the groove R is required to be low during pressurization, and a large opening is not required. The secondary coating breakage problem caused by the excessive opening of the groove R is effectively avoided.
  • the thickness of the first adhesive layer 11 is from 20 ⁇ m to 60 ⁇ m.
  • the first adhesive layer 11 has a thickness of 30 ⁇ m to 40 ⁇ m.
  • the total thickness of the first adhesive layer 11 and the first substrate 12 is from 10 ⁇ m to 100 ⁇ m.
  • the total thickness of the first adhesive layer 11 and the first substrate 12 i.e., the thickness of the roll I
  • the thickness of the second adhesive layer 21 is from 1 ⁇ m to 30 ⁇ m.
  • the second adhesive layer 21 has a thickness of 10 ⁇ m to 15 ⁇ m.
  • the total thickness of the second adhesive layer 21 and the second substrate 22 is 5 ⁇ m to 40 ⁇ m.
  • the total thickness of the second adhesive layer 21 and the second substrate 22 is from 10 ⁇ m to 20 ⁇ m.
  • the opening area of the groove R is from 1 mm 2 to 50 mm 2 .
  • the opening area of the groove R is 4 mm 2 to 16 mm 2 .
  • the groove R is disposed in a die-cutting manner.
  • the number of the grooves R is one or more.
  • the shape of the groove R is not limited, and preferably, the groove R has a rectangular shape.
  • the position of the groove R in the first adhesive layer 11 and the first substrate 12 is not limited.
  • the groove R is located at a central portion of the first adhesive layer 11 and the first substrate 12.
  • the groove R may also penetrate the first adhesive layer 11 and the first substrate 12 in the width direction W or the length direction L.
  • the coating of the slurry of the first adhesive layer 11 is selected from gravure coating, blade coating, extrusion coating or spray coating.
  • the coating of the slurry of the second adhesive layer 21 is selected from gravure coating, knife coating, extrusion coating or spray coating.
  • the particle size of the blowing agent particles 111 is from 5 ⁇ m to 30 ⁇ m.
  • the blowing agent particles 111 are physical foaming agents and/or chemical foaming 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 (AC), azobisisobutyronitrile (AIBN), N,N-dinitrosopentamethylenetetramine (DPT), 4,4'- One or more of oxybisbenzenesulfonylhydrazide (OBSH) and p-toluenesulfonylhydrazide (TSH).
  • AC azodicarbonamide
  • AIBN azobisisobutyronitrile
  • DPT N,N-dinitrosopentamethylenetetramine
  • OBSH oxybisbenzenesulfonylhydrazide
  • TSH p-toluenesulfonylhydrazide
  • the first substrate 12 is selected from the group consisting of polyparaphenylene Ethylene glycol dicarboxylate (PET).
  • PET polyparaphenylene Ethylene glycol dicarboxylate
  • the first adhesive is selected from one or more of an acrylate type adhesive and a urethane adhesive.
  • the second substrate 22 is selected from the group consisting of polyethylene terephthalate (PET).
  • the second adhesive is selected from one or more of an acrylate type adhesive and a urethane adhesive.
  • a curing agent is further included in the first adhesive layer 11 and/or the second adhesive layer 21.
  • the curing agent in the first adhesive layer 11 and the curing agent in the second adhesive layer 21 may be the same or different.
  • 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 residual amount of the first solvent accounts for the total weight of the slurry of the first adhesive layer 11
  • the ratio is not more than 1%.
  • the residual amount of the second solvent accounts for the total weight of the slurry of the second adhesive layer 12.
  • the ratio 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 from 40 ° C to 45 ° C
  • the ripening time is from 48 h to 72 h.
  • the distance between the surface of the first substrate 12 away from the first adhesive layer 11 and the second adhesive layer 21 in the roll II in the roll I is removed.
  • the surface of the two substrates 22 is composited under a pressure of 5 kg to 12 kg.
  • 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.
  • the slurry of the first adhesive layer is coated on the first substrate PET (thickness: 10 ⁇ m) by a doctor blade, and the release film is attached to the other side of the slurry of the first adhesive layer (silicone-coated PET film, thickness 50 ⁇ m), heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate, the walking speed is 10m / min ⁇ 12m / min, the thickness of the slurry coating is 10 ⁇ m, then the first in the thickness direction
  • the die-cutting layer in the adhesive layer, the first substrate, and the release film forms a through-groove (opening area of 1 mm 2 ), and then the release film which has been die-cut and punched is peeled off, and is re-positioned in its original position. A new release film is attached to obtain a roll I.
  • 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 second substrate PET (thickness: 5 ⁇ 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 roll II has a running speed of 10 m/min to 12 m/min, and the slurry coating thickness is 1 ⁇ m.
  • the surface of the first substrate in the roll I away from the first adhesive layer and the surface of the second adhesive layer in the roll II away from the second 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 number of breaks of the roll I is: 0 times / 1000 m.
  • the structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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.
  • the structural adhesive tape 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.
  • the foaming agent particle foaming failure rate was 0%
  • the structural adhesive paper debonding rate was 0%
  • the structural adhesive paper peeling failure rate was 0%.
  • 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.
  • the slurry of the first adhesive layer is coated on the first substrate PET (thickness: 10 ⁇ m) by a doctor blade, and the release film is attached to the other side of the slurry of the first adhesive layer (silicone-coated PET film, thickness 50 ⁇ m), heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate, the running speed is 10 m / min ⁇ 12 m / min, the slurry coating thickness is 50 ⁇ m, then the first in the thickness direction
  • the die-cutting layer in the adhesive layer, the first substrate, and the release film forms a through-groove (opening area of 1 mm 2 ), and then the release film which has been die-cut and punched is peeled off, and is re-positioned in its original position. A new release film is attached to obtain a roll I.
  • 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 second substrate PET (thickness: 20 ⁇ 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 roll II has a running speed of 10 m/min to 12 m/min, and the slurry coating thickness is 10 ⁇ m.
  • the surface of the first substrate in the roll I away from the first adhesive layer and the surface of the second adhesive layer in the roll II away from the second 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 number of breaks of the roll I is: 0 times / 1000 m.
  • the structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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.
  • the structural adhesive tape 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.
  • the foaming agent foaming failure rate was 0%
  • the structural adhesive paper debonding rate was 0%
  • the structural adhesive paper peeling failure rate was 0%.
  • the first adhesive acrylate type adhesive, blowing agent particles cyclopentane (filtered through a 150 mesh sieve, foaming temperature of 120 ° C ⁇ 130 ° C) and ethyl acetate at 40 rpm
  • the slurry of the first adhesive layer was prepared by stirring at -60 rpm for 30 minutes.
  • the slurry of the first adhesive layer is coated on the first substrate PET (thickness of 10 ⁇ m) by a doctor blade (corresponding to the operation of step S1 in FIG. 7), and the other side of the slurry of the first adhesive layer is attached.
  • a release film silicone-coated PET film having a thickness of 50 ⁇ m) (corresponding to the operation of step S2 in Fig.
  • step S3 in FIG. 7 the release film which has undergone die-cutting is peeled off (corresponding to the operation of step S4 in FIG. 7 ), and a new release film is reattached in the original position (corresponding to the steps in FIG. 7 ).
  • 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 surface of the first substrate of the roll I by a doctor blade (corresponding to the operation of step S6 in FIG. 7), the thickness of the slurry coating is 10 ⁇ m, and then the second glue
  • the surface of the adhesive layer 21 is provided with a second substrate 22 (thickness of 20 ⁇ m) (corresponding to the operation of step S7 in FIG. 7), and heated to an oven temperature of 75 ° C for 2 minutes to remove toluene, and the running speed is 10 m/min to 12 m. /min.
  • the structural adhesive paper is heated to 45 ° C for 60 h, that is, the preparation of the structural adhesive tape is completed.
  • the number of breaks of the roll I is: 3 times / 1000 m.
  • the structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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.
  • the structural adhesive tape 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.
  • the foaming agent foaming failure rate was 0%
  • the structural adhesive paper debonding rate was 3%
  • the structural adhesive paper peeling failure rate was 0%.
  • the burr is easily generated around the groove after the die-cutting of the roll I, when the slurry of the second adhesive layer is applied on the surface of the roll I, it is also prone to scraping the burr to cause the roll.
  • the number of breaks of the roll I was 3 times/1000 m.
  • Example 1-2 the roll I and the roll II were separately prepared, and the roll I and the roll II were passed.
  • the pressure roller is pressed and composited, since the thickness of the coil II is relatively thin, during the compounding process, the pressure of the pressure roller is applied, and the coil II at the opening of the groove is deformed, so that the second adhesive layer enters and fills up. Grooves to ensure contact with the current collector.
  • the preparation method since the slurry of the second adhesive layer becomes solid after the drying process, the requirement for the size of the groove is lowered, and the groove is not filled with the second adhesive layer.
  • the structural adhesive paper is not sticky, and the structural adhesive tape breakage can be avoided.

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  • Adhesive Tapes (AREA)
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Abstract

The present invention provides a method for fabricating a structural adhesive paper, comprising the steps: mixing a first adhesive, a blowing agent particulate, and a first solvent to produce a slurry of a first adhesive layer, then applying same to a first base material; heating to a first temperature and drying so as to remove the first solvent; arranging grooves running through the first adhesive layer and the first base material in the thickness direction to obtain a material roll I; mixing a second adhesive and a second solvent to produce a slurry of a second adhesive layer, then applying same to a second base material; heating to a second temperature and drying so as to remove the second solvent to obtain a material roll II; pressurizing and compounding the material roll I and material roll II and heating to a third temperature and curing, such that the second adhesive layer enters and completely fills the groove under the effect of the pressure, thus completing the fabrication of the structural adhesive paper. The method for fabricating the structural adhesive paper of the present invention effectively reduces the probability of the structural adhesive paper prematurely losing its adhesiveness and being difficult to peel, while also effectively reducing the probability of breakage during the process of fabricating the structural adhesive.

Description

结构胶纸的制备方法Method for preparing structural adhesive tape 技术领域Technical field
本发明涉及胶纸领域，尤其涉及一种结构胶纸的制备方法。The invention relates to the field of adhesive tape, in particular to a preparation method of structural adhesive tape.
背景技术Background technique
目前二次电池制备过程中，常采用激光清洗的方法将正负极片上的活性物质清除，以在集流体上裸露形成用于焊接极耳的预留区域。但是采用激光对正负极片上的活性物质进行清洗时，存在针孔、毛刺以及活性物质残留的情况，导致二次电池易发生内短路，且还存在极耳脱落引发的断路问题。At present, in the preparation process of the secondary battery, the active material on the positive and negative electrode sheets is often removed by a laser cleaning method to expose a predetermined area for soldering the ear on the current collector. However, when the active material on the positive and negative electrode sheets is cleaned by a laser, there are cases where pinholes, burrs, and active materials remain, which causes the secondary battery to be easily short-circuited, and there is also a problem of disconnection caused by the falling of the ear.
在现有技术中，涂布前在集流体的预留区域粘贴结构胶纸可以解决这个问题。结构胶纸一般采用PET基材和丙烯酸酯系压敏型胶黏剂加发泡剂实现发泡从而与集流体产生剥离，以在集流体形成焊接极耳的预留区域。在结构胶纸中，靠近集流体的发泡剂颗粒与集流体之间的胶黏剂层的厚度决定结构胶纸与集流体之间粘结力的大小，该厚度越大，粘结力越大。然而由于该厚度无法通过常规制备工艺进行控制，所以使用目前的结构胶纸预留极耳区域的方法存在结构胶纸过早失粘和不易剥离两种极端的情况。如何避免上述问题的出现是本领域目前的研究难题。In the prior art, the application of structural adhesive tape to the reserved area of the current collector before coating can solve this problem. The structural adhesive tape is generally foamed by a PET substrate and an acrylate-based pressure-sensitive adhesive plus a foaming agent to cause peeling from the current collector to form a reserved region of the welding tab at the current collector. In structural adhesive tape, the thickness of the adhesive layer between the foaming agent particles and the current collector near the current collector determines the amount of adhesion between the structural adhesive paper and the current collector. The greater the thickness, the greater the adhesion. Big. However, since the thickness cannot be controlled by a conventional preparation process, the method of preserving the tab area using the current structural adhesive paper has two extremes of premature adhesive loss and poor peeling of the structural adhesive tape. How to avoid the above problems is the current research problem in the field.
发明内容Summary of the invention
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的制备方法，其能有效降低结构胶纸出现过早失粘和不易剥离的几率，同时有效降低结构胶纸制备过程中出现断带的几率。In view of the problems in the prior art, an object of the present invention is to provide a method for preparing a structural adhesive tape, which can effectively reduce the premature loss of adhesion and non-peeling of the structural adhesive tape, and effectively reduce the preparation process of the structural adhesive tape. The chance of a broken band.
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的制备方法，其包括步骤：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第一基材上，加热至第一温度进行烘干以除去第一溶剂，所述第一温度低于发泡剂颗粒的发泡温度，沿厚度方向在第一胶黏剂层、第一基材中贯通设置凹槽，得到料卷Ⅰ； 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第二基材上，加热至第二温度进行烘干以除去第二溶剂，得到料卷Ⅱ；将料卷Ⅰ中第一基材的远离第一胶黏剂层的表面与料卷Ⅱ中第二胶黏剂层的远离第二基材的表面加压复合并加热至第三温度进行熟化，使第二胶黏剂层在压力作用下进入并填充满凹槽，即完成结构胶纸的制备，其中，所述第三温度低于发泡剂颗粒的发泡温度，且在所述结构胶纸中，第一胶黏剂层和位于凹槽处的第二胶黏剂层一起用于粘贴在被粘接对象上。In order to achieve the above object, in one aspect of the present invention, the present invention provides a method for preparing a structural adhesive tape, comprising the steps of: stirring a first adhesive, a foaming agent particle, and a first solvent into a first adhesive; a slurry of the adhesive layer, coating the slurry of the first adhesive layer on the first substrate, heating to a first temperature for drying to remove the first solvent, the first temperature being lower than the blowing agent The foaming temperature of the particles, along the thickness direction in the first adhesive layer, the first substrate through the groove, to obtain the coil I; The second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer, the slurry of the second adhesive layer is coated on the second substrate, and heated to a second temperature for drying To remove the second solvent, to obtain a roll II; to add the surface of the first substrate away from the first adhesive layer in the roll I and the surface of the second adhesive layer in the roll II away from the second substrate Pressing and heating to a third temperature for aging, so that the second adhesive layer enters and fills the groove under pressure, that is, the preparation of the structural adhesive paper is completed, wherein the third temperature is lower than the foaming agent particles The foaming temperature, and in the structural adhesive paper, the first adhesive layer and the second adhesive layer at the groove are used together for bonding to the object to be bonded.
本发明的有益效果为：The beneficial effects of the invention are:
本发明的结构胶纸的制备方法能有效降低结构胶纸出现过早失粘和不易剥离的几率，同时有效降低结构胶纸制备过程中出现断带的几率。The preparation method of the structural adhesive tape of the invention can effectively reduce the probability of premature loss of adhesion and non-peeling of the structural adhesive tape, and at the same time effectively reduce the probability of occurrence of breakage during the preparation of the structural adhesive tape.
附图说明DRAWINGS
图1为本发明的结构胶纸的一立体图；Figure 1 is a perspective view of the structural adhesive tape of the present invention;
图2为本发明的结构胶纸沿凹槽位置作出的一剖视图；Figure 2 is a cross-sectional view of the structural adhesive tape of the present invention taken along the position of the groove;
图3为本发明的结构胶纸的一仰视图；Figure 3 is a bottom plan view of the structural adhesive tape of the present invention;
图4为本发明的结构胶纸的另一仰视图；Figure 4 is another bottom view of the structural adhesive tape of the present invention;
图5为本发明的结构胶纸的又一仰视图；Figure 5 is another bottom view of the structural adhesive tape of the present invention;
图6为采用本发明的制备方法进行结构胶纸的制备的一流程图；Figure 6 is a flow chart showing the preparation of structural adhesive tape by the preparation method of the present invention;
图7为采用已知的制备方法进行结构胶纸的制备的一流程图。Figure 7 is a flow chart for the preparation of structural adhesive tape using known preparation methods.
其中，附图标记说明如下：Among them, the reference numerals are as follows:
11第一胶黏剂层11 first adhesive layer
111发泡剂颗粒111 foaming agent particles
12第一基材12 first substrate
21第二胶黏剂层21 second adhesive layer
22第二基材22 second substrate
M离型膜W宽度方向M release film W width direction
T厚度方向T thickness direction
S1、S2、S3、S4、S5、S6、S7、S11、S12、S13、S14、S15、S21、S31、S41步骤 Steps S1, S2, S3, S4, S5, S6, S7, S11, S12, S13, S14, S15, S21, S31, S41
具体实施方式detailed description
下面详细说明根据本发明的结构胶纸的制备方法。The preparation method of the structural adhesive paper according to the present invention will be described in detail below.
参照图1和图2，示出本发明的结构胶纸，其自下而上沿厚度方向T依次设置有第一胶黏剂层11、第一基材12、第二胶黏剂层21以及第二基材22，第一胶黏剂层11用于粘贴在被粘接对象(诸如集流体)上且包括第一胶黏剂以及发泡剂颗粒111。第一胶黏剂层11以及第一基材12沿厚度方向T贯通设置有凹槽R，凹槽R填充有第二胶黏剂层21的浆料。在该结构胶纸中，由于凹槽R处的第二胶黏剂层21不含发泡剂颗粒，因此在第一胶黏剂层11中的发泡剂颗粒111发泡后仍能保持与被粘接对象粘结，保证结构胶纸出烘箱后不失粘，避免出现结构胶纸失粘，污染烘箱，同时又保证结构胶纸容易被毛刷剥离。1 and 2, the structural adhesive tape of the present invention is shown in which a first adhesive layer 11, a first substrate 12, a second adhesive layer 21, and a second adhesive layer 21 are sequentially disposed in the thickness direction T from bottom to top. The second substrate 22, the first adhesive layer 11 is for adhering to an object to be bonded, such as a current collector, and includes a first adhesive and blowing agent particles 111. The first adhesive layer 11 and the first substrate 12 are provided with a groove R penetrating in the thickness direction T, and the groove R is filled with the slurry of the second adhesive layer 21. In the structural adhesive tape, since the second adhesive layer 21 at the groove R does not contain the blowing agent particles, the blowing agent particles 111 in the first adhesive layer 11 can remain after being foamed. The object to be bonded is bonded to ensure that the structural adhesive tape does not lose its viscosity after being out of the oven, avoiding the loss of stickiness of the structural adhesive tape, contaminating the oven, and ensuring that the structural adhesive tape is easily peeled off by the brush.
参照图6，根据本发明的结构胶纸的制备方法包括步骤：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的浆料涂布在第一基材12上(对应图6中步骤S11的操作)，加热至第一温度进行烘干以除去第一溶剂，所述第一温度低于发泡剂颗粒111的发泡温度，沿厚度方向T在第一胶黏剂层11、第一基材12中贯通设置凹槽R(对应图6中步骤S13的操作)，得到料卷Ⅰ；将第二胶黏剂以及第二溶剂搅拌制成第二胶黏剂层21的浆料，将第二胶黏剂层21的浆料涂布在第二基材22上(对应图6中步骤S21的操作)，加热至第二温度进行烘干以除去第二溶剂，得到料卷Ⅱ；将料卷Ⅰ中第一基材12的远离第一胶黏剂层11的表面与料卷Ⅱ中第二胶黏剂层21的远离第二基材22的表面加压复合并加热至第三温度进行熟化(对应图6中步骤S31的操作)，使第二胶黏剂层21在压力作用下进入并填充满凹槽R，即完成结构胶纸1的制备，其中，所述第三温度低于发泡剂颗粒111的发泡温度。在所述结构胶纸中，第一胶黏剂层11和位于凹槽R处的第二胶黏剂层21一起用于粘贴在被粘接对象上。Referring to Figure 6, the method for preparing a structural adhesive tape according to the present invention comprises the steps of: stirring a first adhesive, a blowing agent particle 111, and a first solvent into a slurry of the first adhesive layer 11, The slurry of the adhesive layer 11 is coated on the first substrate 12 (corresponding to the operation of step S11 in FIG. 6), heated to a first temperature for drying to remove the first solvent, and the first temperature is lower than the hair a foaming temperature of the foaming agent particles 111, and a groove R is formed in the first adhesive layer 11 and the first base material 12 in the thickness direction T (corresponding to the operation of step S13 in FIG. 6) to obtain a roll I; The second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer 21, and the slurry of the second adhesive layer 21 is coated on the second substrate 22 (corresponding to step S21 in FIG. 6) The operation is performed by heating to a second temperature for drying to remove the second solvent to obtain a roll II; and the surface of the first substrate 12 away from the first adhesive layer 11 and the roll II in the roll I The surface of the second adhesive layer 21 away from the second substrate 22 is press-composited and heated to a third temperature for curing (corresponding to the operation of step S31 in FIG. 6) to make the second adhesive Layer 21 enters under pressure and filling up the groove R, is completed by preparing a tape structure, wherein said third temperature is below the foaming temperature of the blowing agent particles 111. In the structural adhesive tape, the first adhesive layer 11 and the second adhesive layer 21 at the groove R are used together for sticking to the object to be bonded.
参照图6，在根据本发明所述的结构胶纸的制备方法中，制备料卷Ⅰ时，还可在将第一胶黏剂层11的浆料涂布在第一基材12上后，即执行完步骤S11的操作后，在第一胶黏剂层11的浆料的另外一面贴附离型膜M(对应图6中步骤S12的操作)，随后加热至第一温度进行烘干以除去第一溶剂，然后 沿厚度方向T在第一胶黏剂层11、第一基材12、离型膜M中贯通设置凹槽R(对应图6中步骤S13的操作)，之后将设置有凹槽R的离型膜M剥离(对应图6中步骤S14的操作)，得到料卷Ⅰ。当离型膜M剥离后，第一胶黏剂层11的表面保持平整，使得结构胶纸的厚度一致性好，易于粘贴在被粘接对象上。优选地，将设置有凹槽R的离型膜M剥离后，还可在其原位重新贴附新的离型膜M(对应图6中步骤S15的操作)，以得到带有离型膜M的料卷Ⅰ，以便于进行料卷Ⅰ和料卷Ⅱ的加压复合，该离型膜M在结构胶纸最终制备完成后剥离。Referring to FIG. 6, in the method for preparing a structural adhesive tape according to the present invention, when the roll I is prepared, after the slurry of the first adhesive layer 11 is coated on the first substrate 12, That is, after the operation of step S11 is performed, the release film M is attached to the other side of the slurry of the first adhesive layer 11 (corresponding to the operation of step S12 in FIG. 6), and then heated to the first temperature for drying. Remove the first solvent, then A groove R is formed in the first adhesive layer 11, the first substrate 12, and the release film M in the thickness direction T (corresponding to the operation of step S13 in FIG. 6), and then the release of the groove R is provided. The film M was peeled off (corresponding to the operation of step S14 in Fig. 6) to obtain a roll I. After the release film M is peeled off, the surface of the first adhesive layer 11 is kept flat, so that the structural adhesive paper has a uniform thickness and is easily attached to the object to be bonded. Preferably, after the release film M provided with the groove R is peeled off, a new release film M (corresponding to the operation of step S15 in FIG. 6) may be reattached in situ to obtain a release film. The roll I of M is used to facilitate the pressurization of the roll I and the roll II, and the release film M is peeled off after the final preparation of the structural adhesive tape.
参照图6，在结构胶纸制备完成后，还可以进行步骤S41的分切操作，以得到与极耳尺寸对应的结构胶纸。Referring to FIG. 6, after the structural adhesive sheet is prepared, the slitting operation of step S41 can also be performed to obtain a structural adhesive sheet corresponding to the tab size.
在根据本发明所述的结构胶纸的制备方法中，将料卷Ⅰ和料卷Ⅱ加压复合时，由于料卷Ⅱ的厚度相对较薄，在复合过程中，受到压辊压力作用，凹槽R开口处的料卷Ⅱ产生变形，使第二胶黏剂层21进入并填充满凹槽R，从而能保证与被粘接对象(诸如集流体)接触。In the preparation method of the structural adhesive paper according to the present invention, when the roll I and the roll II are press-compressed, since the thickness of the roll II is relatively thin, in the compounding process, the pressure of the press roll is applied, and the concave pressure is applied. The roll II at the opening of the groove R is deformed so that the second adhesive layer 21 enters and fills the groove R, thereby ensuring contact with the object to be bonded, such as a current collector.
本发明所述的结构胶纸的制备方法能保证第二胶黏剂层21在压力作用下通过变形挤入凹槽R，从而填充满凹槽R实现与被粘接对象粘结。由于凹槽R处第二胶黏剂层21不含发泡剂颗粒，所以在第一胶黏剂层11中的发泡剂颗粒111发泡后，结构胶纸仍和被粘接对象保持粘粘，降低结构胶纸出现过早失粘的几率。同时在第一胶黏剂层11中的发泡剂颗粒111发泡后，第一胶黏剂层11与被粘接对象失去粘结，仅凹槽R处的第二胶黏剂层21保持与被粘接对象粘结，因此不会造成结构胶纸与被粘接对象之间的粘结力过大，进而使得发泡后的结构胶纸还容易从被粘接对象上剥离。另外，将料卷Ⅰ和料卷Ⅱ加压复合时，由于第二胶黏剂层21已经成为固态，因此加压复合时对凹槽R开口大小要求变低，不需要较大的开口，同时有效避免因凹槽R开口过大导致的二次涂布断带问题。The method for preparing the structural adhesive paper according to the present invention can ensure that the second adhesive layer 21 is pressed into the groove R by deformation under pressure, thereby filling the full groove R to bond with the object to be bonded. Since the second adhesive layer 21 at the groove R does not contain the foaming agent particles, after the foaming agent particles 111 in the first adhesive layer 11 are foamed, the structural adhesive paper remains adhered to the object to be bonded. Sticking, reducing the chance of structural adhesive paper appearing prematurely. At the same time, after the foaming agent particles 111 in the first adhesive layer 11 are foamed, the first adhesive layer 11 loses adhesion with the object to be bonded, and only the second adhesive layer 21 at the groove R remains. The adhesive material is bonded to the object to be bonded, so that the adhesive force between the structural adhesive tape and the object to be bonded is not excessively increased, and the structural adhesive tape after foaming is also easily peeled off from the object to be bonded. In addition, when the roll I and the roll II are press-compressed, since the second adhesive layer 21 has become solid, the size of the opening of the groove R is required to be low during pressurization, and a large opening is not required. The secondary coating breakage problem caused by the excessive opening of the groove R is effectively avoided.
在根据本发明所述的结构胶纸的制备方法中，第一胶黏剂层11的厚度为20μm～60μm。优选地，第一胶黏剂层11的厚度为30μm～40μm。In the method of producing a structural adhesive tape according to the present invention, the thickness of the first adhesive layer 11 is from 20 μm to 60 μm. Preferably, the first adhesive layer 11 has a thickness of 30 μm to 40 μm.
在根据本发明所述的结构胶纸的制备方法中，第一胶黏剂层11和第一基材12的总厚度(即料卷Ⅰ的厚度)为10μm～100μm。优选地，第一胶黏剂层11和第一基材12的总厚度(即料卷Ⅰ的厚度)为30μm～60μm。 In the method of producing a structural adhesive tape according to the present invention, the total thickness of the first adhesive layer 11 and the first substrate 12 (i.e., the thickness of the roll I) is from 10 μm to 100 μm. Preferably, the total thickness of the first adhesive layer 11 and the first substrate 12 (i.e., the thickness of the roll I) is from 30 μm to 60 μm.
在根据本发明所述的结构胶纸的制备方法中，第二胶黏剂层21的厚度为1μm～30μm。优选地，第二胶黏剂层21的厚度为10μm～15μm。In the method of producing a structural adhesive tape according to the present invention, the thickness of the second adhesive layer 21 is from 1 μm to 30 μm. Preferably, the second adhesive layer 21 has a thickness of 10 μm to 15 μm.
在根据本发明所述的结构胶纸的制备方法中，第二胶黏剂层21和第二基材22的总厚度(即料卷Ⅱ的厚度)为5μm～40μm。优选地，第二胶黏剂层21和第二基材22的总厚度(即料卷Ⅱ的厚度)为10μm～20μm。In the method of producing a structural adhesive tape according to the present invention, the total thickness of the second adhesive layer 21 and the second substrate 22 (i.e., the thickness of the roll II) is 5 μm to 40 μm. Preferably, the total thickness of the second adhesive layer 21 and the second substrate 22 (i.e., the thickness of the roll II) is from 10 μm to 20 μm.
在根据本发明所述的结构胶纸的制备方法中，凹槽R的开口面积为1mm2～50mm2。优选地，凹槽R的开口面积为4mm2～16mm2。In the method of producing a structural adhesive tape according to the present invention, the opening area of the groove R is from 1 mm 2 to 50 mm 2 . Preferably, the opening area of the groove R is 4 mm 2 to 16 mm 2 .
在根据本发明所述的结构胶纸的制备方法中，凹槽R的设置方式采用模切冲孔。In the method of producing a structural adhesive tape according to the present invention, the groove R is disposed in a die-cutting manner.
在根据本发明所述的结构胶纸的制备方法中，凹槽R的数量为一个或多个。In the method of producing a structural adhesive tape according to the present invention, the number of the grooves R is one or more.
在根据本发明所述的结构胶纸的制备方法中，凹槽R的形状不受限制，优选地，凹槽R具有矩形形状。In the method of producing a structural adhesive tape according to the present invention, the shape of the groove R is not limited, and preferably, the groove R has a rectangular shape.
在根据本发明所述的结构胶纸的制备方法中，凹槽R在第一胶黏剂层11和第一基材12中的位置不受限制。优选地，参照图3，凹槽R位于第一胶黏剂层11和第一基材12的中央部分。当然，参照图4和图5，凹槽R也可沿宽度方向W或长度方向L贯通第一胶黏剂层11和第一基材12。In the method of producing a structural adhesive tape according to the present invention, the position of the groove R in the first adhesive layer 11 and the first substrate 12 is not limited. Preferably, referring to FIG. 3, the groove R is located at a central portion of the first adhesive layer 11 and the first substrate 12. Of course, referring to FIGS. 4 and 5, the groove R may also penetrate the first adhesive layer 11 and the first substrate 12 in the width direction W or the length direction L.
在根据本发明所述的结构胶纸的制备方法中，第一胶黏剂层11的浆料的涂布方式选自凹版印刷涂布、刮刀涂布、挤压涂布或喷涂。In the method of producing a structural adhesive tape according to the present invention, the coating of the slurry of the first adhesive layer 11 is selected from gravure coating, blade coating, extrusion coating or spray coating.
在根据本发明所述的结构胶纸的制备方法中，第二胶黏剂层21的浆料的涂布方式选自凹版印刷涂布、刮刀涂布、挤压涂布或喷涂。In the method of producing a structural adhesive tape according to the present invention, the coating of the slurry of the second adhesive layer 21 is selected from gravure coating, knife coating, extrusion coating or spray coating.
在根据本发明所述的结构胶纸的制备方法中，发泡剂颗粒111的粒径为5μm～30μm。In the method for producing a structural adhesive paper according to the present invention, the particle size of the blowing agent particles 111 is from 5 μm to 30 μm.
在根据本发明所述的结构胶纸的制备方法中，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(AC)、偶氮二异丁腈(AIBN)、N,N-二亚硝基五次甲基四胺(DPT)、4,4'-氧代双苯磺酰肼(OBSH)、对甲苯磺酰肼(TSH)中的一种或几种。In the method of producing a structural adhesive paper according to the present invention, the blowing agent particles 111 are physical foaming agents and/or chemical foaming agents. The physical foaming agent is an alkane long chain series foaming agent. Preferably, 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 (AC), azobisisobutyronitrile (AIBN), N,N-dinitrosopentamethylenetetramine (DPT), 4,4'- One or more of oxybisbenzenesulfonylhydrazide (OBSH) and p-toluenesulfonylhydrazide (TSH).
在根据本发明所述的结构胶纸的制备方法中，第一基材12选自聚对苯 二甲酸乙二醇酯(PET)。In the method of producing a structural adhesive tape according to the present invention, the first substrate 12 is selected from the group consisting of polyparaphenylene Ethylene glycol dicarboxylate (PET).
在根据本发明所述的结构胶纸的制备方法中，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。In the method of preparing a structural adhesive tape according to the present invention, the first adhesive is selected from one or more of an acrylate type adhesive and a urethane adhesive.
在根据本发明所述的结构胶纸的制备方法中，第二基材22选自聚对苯二甲酸乙二醇酯(PET)。In the method of producing a structural adhesive tape according to the present invention, the second substrate 22 is selected from the group consisting of polyethylene terephthalate (PET).
在根据本发明所述的结构胶纸的制备方法中，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。In the method of producing a structural adhesive tape according to the present invention, the second adhesive is selected from one or more of an acrylate type adhesive and a urethane adhesive.
在根据本发明所述的结构胶纸的制备方法中，第一胶黏剂层11和/或第二胶黏剂层21中还包括固化剂。In the method of producing a structural adhesive tape according to the present invention, a curing agent is further included in the first adhesive layer 11 and/or the second adhesive layer 21.
在根据本发明所述的结构胶纸的制备方法中，第一胶黏剂层11中的固化剂与第二胶黏剂层21中的固化剂可以相同，也可以不同。In the method of producing a structural adhesive tape according to the present invention, the curing agent in the first adhesive layer 11 and the curing agent in the second adhesive layer 21 may be the same or different.
在根据本发明所述的结构胶纸的制备方法中，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。In the method of producing a structural adhesive paper according to the present invention, the curing agent may be a room temperature curing agent. Preferably, 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.
在根据本发明所述的结构胶纸的制备方法中，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％。In the method for producing a structural adhesive tape according to the present invention, after heating to a first temperature for drying to remove the first solvent, the residual amount of the first solvent accounts for the total weight of the slurry of the first adhesive layer 11 The ratio is not more than 1%.
在根据本发明所述的结构胶纸的制备方法中，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％。In the method for producing a structural adhesive tape according to the present invention, after heating to a second temperature for drying to remove the second solvent, the residual amount of the second solvent accounts for the total weight of the slurry of the second adhesive layer 12. The ratio is not more than 1%.
在根据本发明所述的结构胶纸的制备方法中，第一温度为75℃～85℃，烘烤时间不小于2min。In the method for producing a structural adhesive tape according to the present invention, the first temperature is from 75 ° C to 85 ° C, and the baking time is not less than 2 min.
在根据本发明所述的结构胶纸的制备方法中，第二温度为75℃～85℃，烘烤时间不小于1min。In the method for producing a structural adhesive tape according to the present invention, the second temperature is from 75 ° C to 85 ° C, and the baking time is not less than 1 min.
在根据本发明所述的结构胶纸的制备方法中，第三温度为40℃～45℃，熟化时间为48h～72h。In the method for producing a structural adhesive tape according to the present invention, the third temperature is from 40 ° C to 45 ° C, and the ripening time is from 48 h to 72 h.
在根据本发明所述的结构胶纸的制备方法中，将料卷Ⅰ中第一基材12的远离第一胶黏剂层11表面与料卷Ⅱ中第二胶黏剂层21的远离第二基材22的表面在5kg～12kg压力下复合。 In the method for preparing a structural adhesive tape according to the present invention, the distance between the surface of the first substrate 12 away from the first adhesive layer 11 and the second adhesive layer 21 in the roll II in the roll I is removed. The surface of the two substrates 22 is composited under a pressure of 5 kg to 12 kg.
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。The present application is further illustrated below in conjunction with the embodiments. It is to be understood that the examples are not intended to limit the scope of the application.
实施例1Example 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。将第一胶黏剂层的浆料采用刮刀涂布在第一基材PET(厚度为10μm)上，在第一胶黏剂层的浆料的另外一面贴附离型膜(涂覆硅油的PET膜，厚度为50μm)，加热至烘箱温度为75℃烘干2min以除去乙酸乙酯，走速为10m/min～12m/min，浆料涂布厚度为10μm，之后沿厚度方向在第一胶黏剂层、第一基材、离型膜中模切冲孔形成贯通的凹槽(开口面积为1mm2)，之后将经过模切冲孔的离型膜剥离，并在其原位置重新贴附新的离型膜，得到料卷Ⅰ。At room temperature, 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. The slurry of the first adhesive layer is coated on the first substrate PET (thickness: 10 μm) by a doctor blade, and the release film is attached to the other side of the slurry of the first adhesive layer (silicone-coated PET film, thickness 50μm), heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate, the walking speed is 10m / min ~ 12m / min, the thickness of the slurry coating is 10μm, then the first in the thickness direction The die-cutting layer in the adhesive layer, the first substrate, and the release film forms a through-groove (opening area of 1 mm 2 ), and then the release film which has been die-cut and punched is peeled off, and is re-positioned in its original position. A new release film is attached to obtain a roll I.
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第二基材PET(厚度为5μm)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，料卷Ⅱ走速为10m/min～12m/min，浆料涂布厚度为1μm。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 second substrate PET (thickness: 5 μm) 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 roll II has a running speed of 10 m/min to 12 m/min, and the slurry coating thickness is 1 μm.
将料卷Ⅰ中第一基材的远离第一胶黏剂层表面与料卷Ⅱ中第二胶黏剂层的远离第二基材的表面在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。The surface of the first substrate in the roll I away from the first adhesive layer and the surface of the second adhesive layer in the roll II away from the second 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.
在制备过程中，料卷I断带次数为：0次/1000m。In the preparation process, the number of breaks of the roll I is: 0 times / 1000 m.
将结构胶纸分切成100等份，之后将结构胶纸粘贴在集流体铝箔上，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。其中，发泡剂颗粒发泡不良率为0％，结构胶纸失粘率为0％，结构胶纸剥离不良率为0％。The structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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. The structural adhesive tape 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. Among them, the foaming agent particle foaming failure rate was 0%, the structural adhesive paper debonding rate was 0%, and the structural adhesive paper peeling failure rate was 0%.
实施例2Example 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。将第一胶黏剂层的浆料采用刮刀涂布在第一基材PET(厚度为10μm)上，在第一胶黏剂层的浆料的另外一面贴附离型膜(涂覆硅油的PET膜，厚度为50μm)，加热至烘箱温度为75℃烘干2min以除去乙酸乙酯，走速为10m/min～12m/min，浆料涂布厚度为50μm，之后沿厚度方向在第一胶黏剂层、第一基材、离型膜中模切冲孔形成贯通的凹槽(开口面积为1mm2)，之后将经过模切冲孔的离型膜剥离，并在其原位置重新贴附新的离型膜，得到料卷Ⅰ。At room temperature, 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. The slurry of the first adhesive layer is coated on the first substrate PET (thickness: 10 μm) by a doctor blade, and the release film is attached to the other side of the slurry of the first adhesive layer (silicone-coated PET film, thickness 50 μm), heated to an oven temperature of 75 ° C for 2 min to remove ethyl acetate, the running speed is 10 m / min ~ 12 m / min, the slurry coating thickness is 50 μm, then the first in the thickness direction The die-cutting layer in the adhesive layer, the first substrate, and the release film forms a through-groove (opening area of 1 mm 2 ), and then the release film which has been die-cut and punched is peeled off, and is re-positioned in its original position. A new release film is attached to obtain a roll I.
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第二基材PET(厚度为20μm)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，料卷Ⅱ走速为10m/min～12m/min，浆料涂布厚度为10μm。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 second substrate PET (thickness: 20 μm) 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 roll II has a running speed of 10 m/min to 12 m/min, and the slurry coating thickness is 10 μm.
将料卷Ⅰ中第一基材的远离第一胶黏剂层表面与料卷Ⅱ中第二胶黏剂层的远离第二基材的表面在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。The surface of the first substrate in the roll I away from the first adhesive layer and the surface of the second adhesive layer in the roll II away from the second 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.
在制备过程中，料卷I断带次数为：0次/1000m。In the preparation process, the number of breaks of the roll I is: 0 times / 1000 m.
将结构胶纸分切成100等份，之后将结构胶纸粘贴在集流体铝箔上，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。其中，发泡剂发泡不良率为0％，结构胶纸失粘率为0％，结构胶纸剥离不良率为0％。The structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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. The structural adhesive tape 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. Among them, the foaming agent foaming failure rate was 0%, the structural adhesive paper debonding rate was 0%, and the structural adhesive paper peeling failure rate was 0%.
对比例1Comparative example 1
参照图7，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。将第一胶黏剂层的浆料采用刮刀涂布在第一基材PET(厚度为10μm)上(对应图7中步骤S1的操作)，第一胶黏剂层的浆料的另外一面贴附离型膜(涂覆硅油的PET膜，厚度为50μm)(对应图7中步骤S2的操作)，加热至烘箱温度为75 ℃烘干2min以除去乙酸乙酯，走速为10m/min～12m/min，浆料涂布厚度为50μm，之后沿厚度方向在第一胶黏剂层、第一基材、离型膜中模切冲孔形成贯通的凹槽(开口面积为1mm2)(对应图7中步骤S3的操作)，之后将经过模切冲孔的离型膜剥离(对应图7中步骤S4的操作)，并在原位置重新贴附新的离型膜(对应图7中步骤S5的操作)，然后清理凹槽处废料，得到料卷Ⅰ。Referring to Figure 7, at room temperature, the first adhesive acrylate type adhesive, blowing agent particles cyclopentane (filtered through a 150 mesh sieve, foaming temperature of 120 ° C ~ 130 ° C) and ethyl acetate at 40 rpm The slurry of the first adhesive layer was prepared by stirring at -60 rpm for 30 minutes. The slurry of the first adhesive layer is coated on the first substrate PET (thickness of 10 μm) by a doctor blade (corresponding to the operation of step S1 in FIG. 7), and the other side of the slurry of the first adhesive layer is attached. A release film (silicone-coated PET film having a thickness of 50 μm) (corresponding to the operation of step S2 in Fig. 7) was heated to an oven temperature of 75 ° C for 2 minutes to remove ethyl acetate, and the running speed was 10 m/min. 12m/min, the thickness of the slurry coating is 50 μm, and then the punching holes are formed in the first adhesive layer, the first substrate, and the release film in the thickness direction to form a through groove (opening area is 1 mm 2 ) ( Corresponding to the operation of step S3 in FIG. 7 , the release film which has undergone die-cutting is peeled off (corresponding to the operation of step S4 in FIG. 7 ), and a new release film is reattached in the original position (corresponding to the steps in FIG. 7 ). The operation of S5), and then the waste at the groove is cleaned to obtain the roll I.
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料卷Ⅰ的第一基材的表面上(对应图7中步骤S6的操作)，浆料涂布厚度为10μm，之后在第二胶黏剂层21的表面设置第二基材22(厚度为20μm)(对应图7中步骤S7的操作)，加热至烘箱温度为75℃烘干2min以除去甲苯，走速为10m/min～12m/min。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 surface of the first substrate of the roll I by a doctor blade (corresponding to the operation of step S6 in FIG. 7), the thickness of the slurry coating is 10 μm, and then the second glue The surface of the adhesive layer 21 is provided with a second substrate 22 (thickness of 20 μm) (corresponding to the operation of step S7 in FIG. 7), and heated to an oven temperature of 75 ° C for 2 minutes to remove toluene, and the running speed is 10 m/min to 12 m. /min.
最后将结构胶纸加热至45℃熟化60h，即完成结构胶纸的制备。Finally, the structural adhesive paper is heated to 45 ° C for 60 h, that is, the preparation of the structural adhesive tape is completed.
在制备过程中，料卷I断带次数为：3次/1000m。In the preparation process, the number of breaks of the roll I is: 3 times / 1000 m.
将结构胶纸分切成100等份，之后将结构胶纸粘贴在集流体铝箔上，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。其中，发泡剂发泡不良率为0％，结构胶纸失粘率为3％，结构胶纸剥离不良率为0％。The structural adhesive paper is divided into 100 equal parts, and then the structural adhesive paper is pasted on the 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. The structural adhesive tape 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. Among them, the foaming agent foaming failure rate was 0%, the structural adhesive paper debonding rate was 3%, and the structural adhesive paper peeling failure rate was 0%.
在对比例1的制备方法中，参照图7，当进行步骤S6的操作时，由于第二胶黏剂层的浆料为液态，其在重力作用下流动并填充至料卷Ⅰ的凹槽R处。但是，当料卷Ⅰ的凹槽开口过小时，第二胶黏剂层的浆料受到第一基材表面张力影响，难以渗透下去，无法与集流体接触，造成结构胶纸的失粘(对比例1中结构胶纸的失粘率为3％)；当料卷Ⅰ的凹槽开口过大时，料卷Ⅰ自身的强度严重下降，涂布第二胶黏剂层的浆料时断带率极高，无法正常生产。此外，由于对料卷Ⅰ模切冲孔后容易在凹槽周围产生毛刺，在料卷Ⅰ的表面涂布第二胶黏剂层的浆料时，还极易出现刮刀刮到毛刺导致料卷Ⅰ断带的情况，对比例1中，料卷I断带次数为3次/1000m。In the preparation method of Comparative Example 1, referring to FIG. 7, when the operation of the step S6 is performed, since the slurry of the second adhesive layer is in a liquid state, it flows under gravity and is filled into the groove R of the roll I. At the office. However, when the groove opening of the coil I is too small, the slurry of the second adhesive layer is affected by the surface tension of the first substrate, is difficult to penetrate, and cannot contact the current collector, causing the structural adhesive paper to become viscous ( The debonding rate of the structural adhesive paper in the ratio 1 is 3%); when the groove opening of the coil I is too large, the strength of the coil I itself is seriously degraded, and the slurry of the second adhesive layer is broken. The rate is extremely high and cannot be produced normally. In addition, since the burr is easily generated around the groove after the die-cutting of the roll I, when the slurry of the second adhesive layer is applied on the surface of the roll I, it is also prone to scraping the burr to cause the roll. In the case of the I-break zone, in the comparative example 1, the number of breaks of the roll I was 3 times/1000 m.
在实施例1-2中，料卷Ⅰ和料卷Ⅱ分开制备，当将料卷Ⅰ和料卷Ⅱ通过 压辊加压复合时，由于料卷Ⅱ的厚度相对较薄，在复合过程中，受到压辊压力作用，凹槽开口处的料卷Ⅱ产生变形，使第二胶黏剂层进入并填充满凹槽，从而能保证与集流体接触。在该制备方法中，由于第二胶黏剂层的浆料经过烘干工序后变为固态，对凹槽的尺寸大小的要求降低，不会出现凹槽未填充满第二胶黏剂层造成结构胶纸失粘的情况，同时还可避免结构胶纸断带情况的出现。 In Example 1-2, the roll I and the roll II were separately prepared, and the roll I and the roll II were passed. When the pressure roller is pressed and composited, since the thickness of the coil II is relatively thin, during the compounding process, the pressure of the pressure roller is applied, and the coil II at the opening of the groove is deformed, so that the second adhesive layer enters and fills up. Grooves to ensure contact with the current collector. In the preparation method, since the slurry of the second adhesive layer becomes solid after the drying process, the requirement for the size of the groove is lowered, and the groove is not filled with the second adhesive layer. The structural adhesive paper is not sticky, and the structural adhesive tape breakage can be avoided.

Claims (26)

  1. 一种结构胶纸的制备方法，其特征在于，包括步骤：A method for preparing a structural adhesive tape, comprising the steps of:
    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)的浆料涂布在第一基材(12)上，加热至第一温度进行烘干以除去第一溶剂，所述第一温度低于发泡剂颗粒(111)的发泡温度，沿厚度方向(T)在第一胶黏剂层(11)、第一基材(12)中贯通设置凹槽(R)，得到料卷Ⅰ；The first adhesive, the blowing agent particles (111) and the first solvent are stirred to form a slurry of the first adhesive layer (11), and the slurry of the first adhesive layer (11) is coated on the slurry. The first substrate (12) is heated to a first temperature for drying to remove the first solvent, the first temperature being lower than the foaming temperature of the blowing agent particles (111), and in the thickness direction (T) a layer of adhesive (11), the first substrate (12) is provided with a groove (R), to obtain a roll I;
    将第二胶黏剂以及第二溶剂搅拌制成第二胶黏剂层(21)的浆料，将第二胶黏剂层(21)的浆料涂布在第二基材(22)上，加热至第二温度进行烘干以除去第二溶剂，得到料卷Ⅱ；The second adhesive and the second solvent are stirred to form a slurry of the second adhesive layer (21), and the slurry of the second adhesive layer (21) is coated on the second substrate (22). Heating to a second temperature for drying to remove the second solvent to obtain a roll II;
    将料卷Ⅰ中第一基材(12)的远离第一胶黏剂层(11)的表面与料卷Ⅱ中第二胶黏剂层(21)的远离第二基材(22)的表面加压复合并加热至第三温度进行熟化，使第二胶黏剂层(21)在压力作用下进入并填充满凹槽(R)，即完成结构胶纸的制备，其中，所述第三温度低于发泡剂颗粒(111)的发泡温度，且在所述结构胶纸中，第一胶黏剂层(11)和位于凹槽(R)处的第二胶黏剂层(21)一起用于粘贴在被粘接对象上。The surface of the first substrate (12) away from the first adhesive layer (11) in the roll I and the surface of the second adhesive layer (21) in the roll II away from the second substrate (22) Pressurizing and heating to a third temperature for aging, so that the second adhesive layer (21) enters and fills the groove (R) under pressure, that is, the preparation of the structural adhesive tape is completed, wherein the third The temperature is lower than the foaming temperature of the blowing agent particles (111), and in the structural adhesive paper, the first adhesive layer (11) and the second adhesive layer at the groove (R) (21 ) Used together for pasting on the object to be bonded.
  2. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第一胶黏剂层(11)的厚度为10μm～60μm，优选为30μm～40μm。The method for producing a structural adhesive tape according to claim 1, wherein the first adhesive layer (11) has a thickness of from 10 μm to 60 μm, preferably from 30 μm to 40 μm.
  3. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第二胶黏剂层(21)的厚度为1μm～30μm，优选为10μm～15μm。The method for producing a structural adhesive tape according to claim 1, wherein the second adhesive layer (21) has a thickness of from 1 μm to 30 μm, preferably from 10 μm to 15 μm.
  4. 根据权利要求2所述的结构胶纸的制备方法，其特征在于，第一胶黏剂层(11)和第一基材(12)的总厚度为20μm～100μm，优选为30μm～60μm。The method for producing a structural adhesive tape according to claim 2, wherein the first adhesive layer (11) and the first substrate (12) have a total thickness of from 20 μm to 100 μm, preferably from 30 μm to 60 μm.
  5. 根据权利要求3所述的结构胶纸的制备方法，其特征在于，第二胶黏剂层(21)和第二基材(22)的总厚度为5μm～40μm，优选为10μm～20μm。 The method of producing a structural adhesive tape according to claim 3, wherein the second adhesive layer (21) and the second substrate (22) have a total thickness of from 5 μm to 40 μm, preferably from 10 μm to 20 μm.
  6. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，凹槽(R)的开口面积为1mm2～50mm2，优选为4mm2～16mm2。The method of producing a structural adhesive tape according to claim 1, wherein the opening area of the groove (R) is from 1 mm 2 to 50 mm 2 , preferably from 4 mm 2 to 16 mm 2 .
  7. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第一胶黏剂层(11)的浆料的涂布方式选自凹版印刷涂布、刮刀涂布、挤压涂布或喷涂。The method for preparing a structural adhesive tape according to claim 1, wherein the slurry of the first adhesive layer (11) is applied by gravure coating, blade coating, extrusion coating or Spraying.
  8. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第二胶黏剂层(21)的浆料的涂布方式选自凹版印刷涂布、刮刀涂布、挤压涂布或喷涂。The method for preparing a structural adhesive tape according to claim 1, wherein the slurry of the second adhesive layer (21) is applied by gravure coating, blade coating, extrusion coating or Spraying.
  9. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，凹槽(R)的设置方式采用模切冲孔。The method for preparing a structural adhesive tape according to claim 1, wherein the groove (R) is disposed in a die-cutting manner.
  10. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，凹槽(R)的数量为一个或多个。The method of producing a structural adhesive tape according to claim 1, wherein the number of the grooves (R) is one or more.
  11. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，发泡剂颗粒(111)的粒径为5μm～30μm。The method of producing a structural adhesive tape according to claim 1, wherein the foaming agent particles (111) have a particle diameter of from 5 μm to 30 μm.
  12. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，发泡剂颗粒(111)为物理发泡剂和/或化学发泡剂。The method of producing a structural adhesive paper according to claim 1, wherein the blowing agent particles (111) are physical foaming agents and/or chemical foaming agents.
  13. 根据权利要求12所述的结构胶纸的制备方法，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。The method for preparing a structural adhesive tape according to claim 12, wherein the physical foaming agent is one selected from the group consisting of isopentane blowing agent, isobutane blowing agent, and cyclopentane blowing agent. Or several; the chemical blowing agent is selected from the group consisting of azodicarbonamide, azobisisobutyronitrile, N,N-dinitrosopentamethylenetetramine, 4,4'-oxobisbenzenesulfonate One or more of a hydrazide or a p-toluenesulfonyl hydrazide.
  14. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第一基材(12)选自聚对苯二甲酸乙二醇酯。 The method of producing a structural adhesive tape according to claim 1, wherein the first substrate (12) is selected from the group consisting of polyethylene terephthalate.
  15. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，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。The method for preparing a structural adhesive tape according to claim 1, wherein the first adhesive is one or more selected from the group consisting of an acrylate type adhesive and a urethane adhesive.
  16. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第二基材(22)选自聚对苯二甲酸乙二醇酯。The method of producing a structural adhesive tape according to claim 1, wherein the second substrate (22) is selected from the group consisting of polyethylene terephthalate.
  17. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，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。The method for preparing a structural adhesive tape according to claim 1, wherein the second adhesive is one or more selected from the group consisting of an acrylate type adhesive and a urethane adhesive.
  18. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第一胶黏剂层(11)和/或第二胶黏剂层(21)中还包括固化剂。The method of preparing a structural adhesive tape according to claim 1, wherein a curing agent is further included in the first adhesive layer (11) and/or the second adhesive layer (21).
  19. 根据权利要求18所述的结构胶纸的制备方法，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。The method for preparing a structural adhesive tape according to claim 18, wherein the curing agent is one or more selected from the group consisting of an aliphatic polyamine, an alicyclic polyamine, a polyamide, a modified aromatic amine, and an isocyanate. Kind.
  20. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，制备料卷Ⅰ时，将第一胶黏剂层(11)的浆料涂布在第一基材(12)上，第一胶黏剂层(11)的浆料的另外一面贴附离型膜(M)，沿厚度方向(T)在第一胶黏剂层(11)、第一基材(12)、离型膜(M)中贯通设置凹槽(R)，之后将设置有凹槽(R)的离型膜(M)剥离，得到料卷Ⅰ。The method for preparing a structural adhesive tape according to claim 1, wherein when the roll I is prepared, the slurry of the first adhesive layer (11) is coated on the first substrate (12), The other side of the slurry of the adhesive layer (11) is attached with a release film (M) in the thickness direction (T) in the first adhesive layer (11), the first substrate (12), and the release film. A groove (R) is formed in the film (M), and then the release film (M) provided with the groove (R) is peeled off to obtain a roll I.
  21. 根据权利要求1所述的结构胶纸的制备方法，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％。The method for preparing a structural adhesive tape according to claim 1, wherein after the first temperature is removed by heating to the first temperature, the residual amount of the first solvent accounts for the slurry of the first adhesive layer (11). The ratio of the total weight of the material is not more than 1%.
  22. 根据权利要求1所述的结构胶纸的制备方法，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％。 The method for preparing a structural adhesive tape according to claim 1, wherein after the second temperature is removed by heating to a second temperature, the residual amount of the second solvent accounts for the slurry of the second adhesive layer (12). The ratio of the total weight of the material is not more than 1%.
  23. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第一温度为75℃～85℃。The method of producing a structural adhesive tape according to claim 1, wherein the first temperature is from 75 ° C to 85 ° C.
  24. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第二温度为75℃～85℃。The method of producing a structural adhesive tape according to claim 1, wherein the second temperature is from 75 ° C to 85 ° C.
  25. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，第三温度为40℃～45℃。The method of producing a structural adhesive tape according to claim 1, wherein the third temperature is from 40 ° C to 45 ° C.
  26. 根据权利要求1所述的结构胶纸的制备方法，其特征在于，将料卷Ⅰ中第一基材(12)的远离第一胶黏剂层(11)的表面与料卷Ⅱ中第二胶黏剂层(21)的远离第二基材(22)的表面在5kg～12kg压力下复合。 The method for preparing a structural adhesive tape according to claim 1, characterized in that the surface of the first substrate (12) away from the first adhesive layer (11) in the roll I and the second in the roll II are The surface of the adhesive layer (21) remote from the second substrate (22) is recombined under a pressure of 5 kg to 12 kg.
PCT/CN2016/102557 2016-10-19 2016-10-19 Method for fabricating structural adhesive paper WO2018072138A1 (en)

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