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CN107304333B - Structural adhesive paper and preparation method thereof - Google Patents

Structural adhesive paper and preparation method thereof Download PDF

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Publication number
CN107304333B
CN107304333B CN201610255450.4A CN201610255450A CN107304333B CN 107304333 B CN107304333 B CN 107304333B CN 201610255450 A CN201610255450 A CN 201610255450A CN 107304333 B CN107304333 B CN 107304333B
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China
Prior art keywords
adhesive
adhesive layer
foaming agent
agent particles
paper
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CN201610255450.4A
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Chinese (zh)
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CN107304333A (en
Inventor
戴志芳
龙海
陶兴华
张盛武
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Priority to CN201610255450.4A priority Critical patent/CN107304333B/en
Priority to PCT/CN2016/084021 priority patent/WO2017181489A1/en
Publication of CN107304333A publication Critical patent/CN107304333A/en
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Publication of CN107304333B publication Critical patent/CN107304333B/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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • 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
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09J2301/21—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being formed by alternating adhesive areas of different nature

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

The invention provides a structural adhesive paper and a preparation method thereof. The structural adhesive paper comprises a first adhesive layer and a base material. The first adhesive layer includes: a first adhesive for adhering to an object to be adhered; and blowing agent particles. The first adhesive layer is provided with a groove, the position of the groove is filled with a second adhesive layer, and the second adhesive layer is used for being adhered to an adhered object and comprises a second adhesive but does not contain foaming agent particles. The first adhesive layer containing the foaming agent particles in the structural adhesive paper disclosed by the invention is kept to be separated from the adhered object after the foaming agent particles are foamed, and the second adhesive layer containing no foaming agent particles is kept to be adhered to the adhered object without being separated, so that the viscosity of the foamed structural adhesive paper can be accurately controlled.

Description

Structural adhesive paper and preparation method thereof
Technical Field
The invention relates to the field of adhesive paper, in particular to structural adhesive paper and a preparation method thereof.
Background
The adhesive paper in the prior art generally adopts a PET substrate, an acrylate pressure-sensitive adhesive and a foaming agent to realize foaming so as to be peeled off from a current collector, so that an electrode ear position is reserved on the current collector. Referring to fig. 14A and 14B, when the amount of the residual solvent in the adhesive is too large (> 10%), the foaming agent is completely coated in the adhesive, and even if the foaming agent expands after foaming, the contact area between the adhesive and the current collector cannot be effectively reduced, so that the adhesive paper is difficult to peel off, and the tab position cannot be reserved on the current collector. Referring to fig. 15A and 15B, when the amount of the residual solvent in the adhesive is relatively appropriate (5% to 10%), part of the foaming agent is close to the interface between the adhesive and the current collector, the contact area between the adhesive and the current collector can be effectively reduced after the foaming agent is foamed, and the adhesive paper can be normally peeled off, but the process requirement is harsh, the yield is low, and the requirement of batch production cannot be met. Referring to fig. 16A and 16B, when the amount of residual solvent in the adhesive is too low (< 5%), most of the foaming agent is exposed outside the adhesive, and after the foaming agent foams, the adhesive almost loses adhesion with the current collector, so that the adhesive paper loses adhesion and pollutes the oven.
Because the particle size distribution of the foaming agent is wide (5-30 micrometers), two failure modes are easy to occur when the foaming agent is mixed in the adhesive for coating and drying. Firstly, the adhesive layer is too thick, and the foaming agent foaming expansion can not effectively reduce the contact area of adhesive and the current collector, leads to the foaming back viscidity too big, can't peel off from the empty foil district of current collector, causes the strip breakage. Secondly, the adhesive layer is too thin, the foaming agent is exposed outside the adhesive, the contact between the adhesive and the empty foil area of the current collector is blocked, the viscosity after foaming is too weak, and the coating is not completely dried when the foaming agent is foamed, so that the foaming agent is easily brought up by hot air and stuck on the wet film area when the viscosity of the foaming agent is weak, and after the wet film is dried, the foaming agent is increased in embedding force and cannot be normally peeled off, and the tape breakage can also be caused.
In addition, the thickness of the adhesive layer is generally required to be in a small range, the precision of the conventional coating process cannot meet the requirement, and a large number of products are scrapped due to thickness fluctuation.
Disclosure of Invention
In view of the problems of the background art, an object of the present invention is to provide a structural adhesive sheet in which a first adhesive layer containing foaming agent particles is kept detached from an object to be bonded after foaming of the foaming agent particles, and a second adhesive layer containing no foaming agent particles is kept attached to the object to be bonded without detachment, thereby accurately controlling the viscosity of the foamed structural adhesive sheet, and a method for manufacturing the same.
The structural adhesive paper has extremely high consistency with the viscosity of the adhered object, is easy to produce in batches, and solves the problem of serious viscosity fluctuation after foaming of a foaming agent in the conventional adhesive paper.
Another object of the present invention is to provide a structural adhesive paper and a method for manufacturing the same, which can improve the utilization rate of active materials of a battery, avoid the waste of the active materials, and simultaneously improve the energy density, fast-flushing and fast-releasing performance, and heat dissipation performance of the battery.
In order to achieve the above object, in one aspect of the present invention, a structural adhesive paper is provided, which includes a first adhesive layer and a substrate. The base material is positioned on one side of the structural adhesive paper, which is far away from the bonded object. The first adhesive layer includes: the first adhesive is used for being adhered to an adhered object, and the surface of the first adhesive, which is adhered to the adhered object, is a first surface; and foaming agent particles distributed in the first adhesive. The first adhesive layer is provided with a groove, the position of the groove is filled with a second adhesive layer, the second adhesive layer is used for being adhered to an adhered object and comprises a second adhesive but does not contain foaming agent particles, and the surface, far away from the base material, of the second adhesive layer is a second surface. And after the structural adhesive paper is adhered to the adhered object, heating the structural adhesive paper, and when the heating temperature of the structural adhesive paper is higher than the foaming temperature of the foaming agent particles, the second adhesive layer is kept adhered to the adhered object without being separated, and the foaming agent particles in the first adhesive layer are foamed, wherein part of the foaming agent particles are exposed out of the first surface after being foamed, and the sum of the sectional areas of the part of the foaming agent particles along the first surface is not less than 70% of the area of the first surface.
In another aspect of the present invention, the present invention provides a method for preparing a structural adhesive paper, for preparing the structural adhesive paper according to one aspect of the present invention, comprising the steps of: stirring the first adhesive, the foaming agent particles and the first solvent to prepare slurry of the first adhesive layer; stirring the second adhesive and a second solvent to prepare slurry of a second adhesive layer; the method comprises the following steps of arranging slurry of a first adhesive layer on a base material, arranging a groove in the first adhesive layer, heating to a first temperature, and drying to remove a first solvent, wherein the first temperature is lower than the foaming temperature of foaming agent particles and ensures that the foaming agent particles are distributed in the first adhesive, so that the first adhesive can be bonded to a bonded object after drying, and the surface of the first adhesive bonded to the bonded object is a first surface; setting the slurry of the second adhesive layer at the corresponding position of the groove, heating to a second temperature, and drying to remove the second solvent, wherein the second temperature is lower than the foaming temperature of the foaming agent particles, so that the dried second adhesive layer can be adhered to an adhered object, and the surface of the second adhesive layer, which is far away from the base material, is a second surface; heating to a third temperature and keeping for a period of time to cure the first adhesive layer and the second adhesive layer, wherein the third temperature is lower than the foaming temperature of the foaming agent particles, and preparing the structural adhesive paper; and after the structural adhesive paper is adhered to the adhered object, heating the structural adhesive paper, and when the heating temperature of the structural adhesive paper is higher than the foaming temperature of the foaming agent particles, the second adhesive layer is kept adhered to the adhered object without being separated, and the foaming agent particles in the first adhesive layer are foamed, wherein part of the foaming agent particles are exposed out of the first surface after being foamed, and the sum of the sectional areas of the part of the foaming agent particles along the first surface is not less than 70% of the area of the first surface.
Compared with the prior art, the invention has the beneficial effects that:
the first adhesive layer containing the foaming agent particles in the structural adhesive paper disclosed by the invention is kept to be separated from the bonded object after the foaming agent particles are foamed, and the second adhesive layer containing no foaming agent particles is kept to be bonded with the bonded object without being separated, so that the viscosity of the foamed structural adhesive paper can be accurately controlled.
The structural adhesive paper has extremely high consistency with the viscosity of the adhered object, is easy to produce in batches, and solves the problem of serious viscosity fluctuation after foaming of a foaming agent in the conventional adhesive paper.
Drawings
Fig. 1 is a perspective view of an adherend current collector to which the structural adhesive paper according to the present invention is applied;
fig. 2 is a perspective view of the structural adhesive paper according to the present invention adhered to a current collector to be adhered;
FIG. 3 is a perspective view of a structural adhesive paper coated with an active material layer according to the present invention;
FIG. 4 is a perspective view of the structural adhesive paper according to the present invention after peeling;
FIG. 5 is a perspective view of a structural adhesive sheet according to the present invention;
FIG. 6 is another perspective view of a structural adhesive paper according to the present invention;
FIG. 7 is a front view of FIG. 5;
FIG. 8 is another front view of FIG. 5;
FIG. 9 is a front view of FIG. 6;
FIG. 10 is another front view of FIG. 6;
FIG. 11 is a top view of the structural adhesive paper with the substrate removed according to the present invention;
FIG. 12 is another top view of the structural adhesive paper according to the present invention with the substrate removed;
FIG. 13 is a further top view of the structural adhesive paper according to the present invention with the substrate removed;
14A-14B are schematic diagrams of an embodiment of a prior art adhesive tape, wherein FIG. 14A shows a schematic diagram before foaming of a foaming agent, and FIG. 14B shows a schematic diagram after foaming of the foaming agent;
fig. 15A to 15B are schematic views of another embodiment of the prior art adhesive tape, wherein fig. 15A shows a schematic view before foaming of the foaming agent, and fig. 15B shows a schematic view after foaming of the foaming agent;
fig. 16A to 16B are schematic diagrams of another embodiment of a prior art adhesive tape, wherein fig. 16A shows a schematic diagram before foaming of a foaming agent, and fig. 16B shows a schematic diagram after foaming of the foaming agent.
Wherein the reference numerals are as follows:
1 structure gummed paper
11 first adhesive layer
111 first adhesive
112 blowing agent particles
111S first surface
12 base material
13 second adhesive layer
13S second surface
2 current collector
21 reserved area
3 active substance layer
W width direction
L longitudinal direction
T thickness direction
1' base material
2' adhesive
21' foaming agent
Detailed Description
The structural adhesive paper and the method for preparing the same according to the present invention are explained in detail below.
The structural adhesive paper according to the first aspect of the present invention is first explained.
Referring to fig. 3, 5 to 10, the structural adhesive paper 1 according to the first aspect of the present invention includes a first adhesive layer 11 and a base material 12. The base material 12 is located on the side of the structural adhesive paper 1 away from the bonded object. The first adhesive layer 11 includes: a first adhesive 111 which is used to adhere to an object to be adhered, and a surface of the first adhesive 111 adhering to the object to be adhered is a first surface 111S; and foaming agent particles 112 distributed on the first adhesive 111. The first adhesive layer 11 is provided with a groove, the position of the groove is filled with a second adhesive layer 13, the second adhesive layer 13 is used for being adhered to an adhered object and comprises a second adhesive 131 but does not contain foaming agent particles, and the surface of the second adhesive layer 13, which is far away from the base material 12, is a second surface 13S. After the structural adhesive paper 1 is bonded to the bonded object, the structural adhesive paper 1 is heated, when the heating temperature of the structural adhesive paper 1 is higher than the foaming temperature of the foaming agent particles 112, the second adhesive layer 13 remains bonded to the bonded object without being separated, and the foaming agent particles 112 in the first adhesive layer 11 are foamed, wherein part of the foaming agent particles 112 are foamed to expose the first surface 111S, and the sum of the sectional areas of the part of the foaming agent particles 112 along the first surface 11S is not less than 70% of the area of the first surface 11S.
In the structural adhesive sheet 1 according to the first aspect of the present invention, the first adhesive layer 11 containing the foaming agent particles 112 in the structural adhesive sheet 1 is kept detached from the adherend after the foaming agent particles 112 are foamed (i.e., the first adhesive 111 is detached from the adherend), and the second adhesive layer 13 containing no foaming agent particles is kept attached to the adherend without detachment, so that the tackiness of the foamed structural adhesive sheet 1 can be accurately controlled.
In the structural adhesive paper 1 according to the first aspect of the present invention, the foaming agent particles 112 of the structural adhesive paper 1 may be exposed to the first surface 111S before foaming, or may not be exposed to the first surface 111S, as long as it is ensured that the foaming agent particles 112 are exposed to the first surface 111S after foaming and the sum of the sectional areas of the partial foaming agent particles 112 along the first surface 11S is not less than 70% of the area of the first surface 11S. Referring to fig. 7 and 9, the foaming agent particles 112 of the structural adhesive paper 1 are not exposed to the first surface 111S before foaming, and referring to fig. 8 and 10, the foaming agent particles 112 of the structural adhesive paper 1 are not exposed to the first surface 111S before foaming.
In the structural adhesive tape 1 according to the first aspect of the present invention, referring to fig. 6, the thickness of the second adhesive layer 13 in the thickness direction T of the structural adhesive tape 1 may be smaller than the thickness of the first adhesive layer 11 in the thickness direction T of the structural adhesive tape 1. Referring to fig. 5, the thickness of the second adhesive layer 13 in the thickness direction T of the structural adhesive paper 1 may also be equal to the thickness of the first adhesive layer 11 in the thickness direction T of the structural adhesive paper 1. In addition, the thickness of the second adhesive layer 13 along the thickness direction T of the structural adhesive tape 1 may also be slightly greater than the thickness of the first adhesive layer 11 along the thickness direction T of the structural adhesive tape 1. Preferably, the thickness of the second adhesive layer 13 in the thickness direction T of the structural adhesive tape 1 is equal to the thickness of the first adhesive layer 11 in the thickness direction T of the structural adhesive tape 1, i.e., the groove penetrates through the first adhesive layer 11 in the thickness direction T.
In the structural adhesive paper 1 according to the first aspect of the present invention, the sum of the cross-sectional areas of the partial foaming agent particles 112 along the first surface 11S is equal to the area of the first surface 11S, so as to ensure that the first adhesive 111 is kept away from the bonded object after the foaming agent particles 112 are foamed, and the structural adhesive paper 1 can be easily torn off.
In the structural adhesive paper 1 according to the first aspect of the present invention, the second surface 13S has an area of 1mm2～100mm2. Preferably, the area of the second surface 13S is 1mm2～10mm2。
In the structural adhesive paper 1 according to the first aspect of the present invention, the particle size of the blowing agent particles 112 is 5 μm to 30 μm.
In the structural adhesive paper 1 according to the first aspect of the present invention, the foaming agent particles 112 are a physical foaming agent and/or a chemical foaming agent. The physical foaming agent is an alkane long-chain series foaming agent. Preferably, the physical foaming agent is selected from one or more of an isopentane foaming agent, an isobutane foaming agent and a cyclopentane foaming agent. The chemical foaming agent is selected from one or more of Azodicarbonamide (AC), Azodiisobutyronitrile (AIBN), N-Dinitrosopentamethylenetetramine (DPT), 4' -oxybis-benzenesulfonyl hydrazide (OBSH) and p-toluenesulfonyl hydrazide (TSH).
In the structural adhesive paper 1 according to the first aspect of the invention, the substrate 12 is selected from polyethylene terephthalate (PET).
In the structural adhesive paper 1 according to the first aspect of the present invention, the first adhesive 111 is selected from one or more of acrylate type adhesives and polyurethane adhesives. The acrylate type adhesive may preferably be 2-methylethylacrylate (EBN).
In the structural adhesive paper 1 according to the first aspect of the present invention, the second adhesive 131 is selected from one or more of acrylate adhesives and polyurethane adhesives. The acrylate type adhesive may preferably be 2-methylethylacrylate (EBN).
In the structural adhesive paper 1 according to the first aspect of the present invention, the first adhesive layer 11 and/or the second adhesive layer 13 further include a curing agent. The curing agent in the first adhesive layer 11 and the curing agent in the second adhesive layer 13 may be the same or different. The curing agent is a room-temperature curing agent, and preferably is one or more of aliphatic polyamine, alicyclic polyamine, low-molecular polyamide, modified arylamine and isocyanate.
In the structural adhesive paper 1 according to the first aspect of the present invention, the thickness of the first adhesive layer 11 is 30 μm to 50 μm.
In the structural adhesive paper 1 according to the first aspect of the present invention, the thickness of the base material 12 is 15 μm to 36 μm.
In the structural adhesive paper 1 according to the first aspect of the present invention, the position of the groove in the first adhesive layer 11 is not limited. Referring to fig. 11, the groove (i.e., the second adhesive layer 13) is located at the center of the first adhesive layer 11. Referring to fig. 12, the groove (i.e., the second adhesive layer 13) penetrates the first adhesive layer 11 in the length direction L. Referring to fig. 13, the groove (i.e., the second adhesive layer 13) penetrates the first adhesive layer 11 in the width direction W.
In the structural adhesive paper 1 according to the first aspect of the present invention, the shape of the groove is not limited, and preferably, the groove has a rectangular shape.
Referring to fig. 1 to 4, in the structural adhesive sheet 1 according to the first aspect of the present invention, the object to be bonded is the current collector 2, the first adhesive layer 11 of the structural adhesive sheet 1 is adhered to the reserved area 21 of the current collector 2 where the tab is formed before the active material layer 3 is coated on the current collector 2, after the active material layer 3 is coated on the current collector 2, the active material layer 3 is dried, and after the drying is completed, the structural adhesive sheet 1 is peeled off to form the reserved area 21 of the tab.
Next, a method for producing the structural adhesive paper according to the second aspect of the present invention will be described.
The method for preparing the structural adhesive paper 1 according to the second aspect of the invention is used for preparing the structural adhesive paper 1 according to the first aspect of the invention, and comprises the following steps: stirring the first adhesive 111, the foaming agent particles 112 and the first solvent to prepare a slurry of the first adhesive layer 11; stirring the second adhesive 131 and the second solvent to prepare a slurry of the second adhesive layer 13; arranging slurry of the first adhesive layer 11 on the base material 12, arranging a groove in the first adhesive layer 11, heating to a first temperature, and drying to remove the first solvent, wherein the first temperature is lower than the foaming temperature of the foaming agent particles 112 and ensures that the foaming agent particles 112 are distributed in the first adhesive 111, so that the dried first adhesive 111 can be adhered to an adhered object, and the surface of the first adhesive 111 adhered to the adhered object is a first surface 111S; arranging the slurry of the second adhesive layer 13 at the corresponding position of the groove, heating to a second temperature, and drying to remove the second solvent, wherein the second temperature is lower than the foaming temperature of the foaming agent particles 112, so that the dried second adhesive layer 13 can be adhered to an adhered object, and the surface of the second adhesive layer 13, which is far away from the base material 12, is a second surface 13S; heating to a third temperature and keeping for a period of time to cure the first adhesive layer 11 and the second adhesive layer 13, wherein the third temperature is lower than the foaming temperature of the foaming agent particles 112, and completing the preparation of the structural adhesive paper 1; after the structural adhesive paper 1 is bonded to the bonded object, the structural adhesive paper 1 is heated, when the heating temperature of the structural adhesive paper 1 is higher than the foaming temperature of the foaming agent particles 112, the second adhesive layer 13 remains bonded to the bonded object without being separated, and the foaming agent particles 112 in the first adhesive layer 11 are foamed, wherein part of the foaming agent particles 112 are foamed to expose the first surface 111S, and the sum of the sectional areas of the part of the foaming agent particles 112 along the first surface 11S is not less than 70% of the area of the first surface 11S.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, the grooves are reserved by directly controlling the slurry of the first adhesive layer 11 to be coated on the base material 12.
In the method of manufacturing the structural adhesive paper 1 according to the second aspect of the present invention, the grooves are formed by providing a mask on the base material 12, thereafter coating the slurry of the first adhesive layer 11 on the base material 12 except for the mask and finally removing the mask.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, after the first solvent is removed by heating to the first temperature and drying, the residual amount of the first solvent is less than 1% of the total weight of the slurry of the first adhesive layer 11.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, after the second solvent is removed by heating to the second temperature and drying, the residual amount of the second solvent is less than 1% of the total weight of the slurry of the second adhesive layer 13.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, the first temperature is 75 to 85 ℃.
In the method for manufacturing the structural adhesive paper 1 according to the second aspect of the present invention, the second temperature is 75 to 85 ℃.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, the third temperature is 40 to 45 ℃.
In the method for preparing the structural adhesive paper 1 according to the second aspect of the present invention, the setting manner of the slurry of the first adhesive layer 11 is not limited, and may be secondary blade coating, extrusion coating, spraying, gravure printing, and the like, preferably gravure printing and secondary blade coating, so as to accurately control the size of the groove, further accurately control the area of the second adhesive layer 13 without the foaming agent particles, and achieve the purpose of accurately controlling the viscosity of the foamed structural adhesive paper 1.
The present application is further illustrated below with reference to examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
Example 1
Filtering cyclopentane serving as a foaming agent (the foaming temperature is 120-130 ℃) by adopting a 150-mesh sieve in a room temperature environment, and then stirring the cyclopentane, EBN and ethyl acetate at the rotating speed of 40-60 rpm to prepare slurry of the first adhesive layer, wherein the stirring time is 30 min.
And stirring the EBN and the toluene at the rotating speed of 40-60 rpm to prepare slurry of the second adhesive layer in a room temperature environment, wherein the stirring time is 30 min.
Arranging a mask on a base material PET (with the thickness of 19 mu m), wherein the area of the arranged mask area is 5mm multiplied by 5mm, the thickness of the mask is the same as that of the slurry of the first adhesive layer, then arranging the slurry of the first adhesive layer on the PET in a secondary scraper coating mode, controlling the coating thickness to be 40 mu m, generating a first material roll, heating the material roll until the temperature of an oven is 75 ℃, controlling the running speed of the first material roll to be 10-12 m/min, and baking for 2min to remove ethyl acetate (the residual amount is lower than 1%);
removing the mask to form a groove, spraying the slurry of the second adhesive layer on the corresponding position of the groove, heating to 75 ℃ in an oven, and baking for 2min to remove toluene (the residual content is less than 1%);
heating to 45 ℃ for curing for 60 hours to finish the preparation of the structural adhesive paper.
Comparative example 1
Filtering cyclopentane serving as a foaming agent (the foaming temperature is 120-130 ℃) by adopting a 150-mesh sieve in a room temperature environment, and then stirring the cyclopentane, EBN and toluene at the rotating speed of 40-60 rpm to prepare slurry of the adhesive layer, wherein the stirring time is 30 min.
The sizing agent of the adhesive layer is arranged on PET (with the thickness of 19 mu m) by adopting a common scraper coating mode, the coating thickness is controlled to be 50 mu m, a material roll is generated, the material roll is heated until the temperature of an oven is 75 ℃, the running speed of the material roll is controlled to be 10-12 m/min, and the baking time is 2min to remove toluene.
The following describes the test procedure for the structural adhesive paper.
The structural adhesive papers of example 1 and comparative example 1 were bonded to a current collector, baked in an oven at 125 ℃ for 20 seconds to foam cyclopentane, and then peeled from the current collector using a high-iron tensile machine, and the peel force between the structural adhesive paper and the current collector was tested.
10 were tested per group and the test results are shown in table 1.
Table 1 test results of example 1 and comparative example 1
As can be seen from table 1, the structural adhesive paper of example 1 has extremely high consistency with the viscosity of the current collector, and is easy to perform mass production, while the structural adhesive paper of comparative example 1 has large viscosity fluctuation after foaming of the foaming agent, and is not favorable for performing mass production.

Claims (11)

1. A structural adhesive paper (1) comprising:
a first adhesive layer (11) comprising:
a first adhesive (111) that adheres to an object to be adhered, and the surface of the first adhesive (111) that adheres to the object to be adhered being a first surface (111S); and
foaming agent particles (112) distributed on the first adhesive (111);
a base material (12) which is positioned on one side of the structural adhesive paper (1) far away from the bonded object;
it is characterized in that the preparation method is characterized in that,
a groove is formed in the first adhesive layer (11), a second adhesive layer (13) is filled in the groove, the second adhesive layer (13) is used for being adhered to an adhered object and comprises a second adhesive (131) but does not contain foaming agent particles, and the surface, far away from the base material (12), of the second adhesive layer (13) is a second surface (13S);
after the structural adhesive paper (1) is bonded to the bonded object, the structural adhesive paper (1) is heated, when the heating temperature of the structural adhesive paper (1) is higher than the foaming temperature of the foaming agent particles (112), the second adhesive layer (13) is kept bonded with the bonded object without being separated, the foaming agent particles (112) in the first adhesive layer (11) are foamed, wherein part of the foaming agent particles (112) are exposed out of the first surface (111S) after being foamed, and the sum of the sectional areas of the part of the foaming agent particles (112) along the first surface (11S) is not less than 70% of the area of the first surface (11S).
2. The structural adhesive paper (1) according to claim 1, characterized in that the thickness of the second adhesive layer (13) in the thickness direction (T) of the structural adhesive paper (1) is equal to the thickness of the first adhesive layer (11) in the thickness direction (T) of the structural adhesive paper (1).
3. The structural adhesive paper (1) according to claim 1, wherein the sum of the cross-sectional areas of the partial blowing agent particles (112) along the first surface (11S) is equal to the area of the first surface (11S).
4. Structural adhesive paper (1) according to claim 1, characterized in that the second surface (13S) has an area of 1mm2～100mm2。
5. Structural adhesive paper (1) according to claim 1, characterized in that the second surface (13S) has an area of 1mm2～10mm2。
6. The structural adhesive paper (1) according to claim 1, wherein the first adhesive (111) is selected from one or more of acrylate type adhesives, polyurethane adhesives.
7. The structural adhesive paper (1) according to claim 1, wherein the second adhesive (131) is selected from one or more of acrylate type adhesives, polyurethane type adhesives.
8. The structural adhesive paper (1) according to any one of claims 1 to 7, wherein the object to be bonded is a current collector (2), the first adhesive layer (11) of the structural adhesive paper (1) is bonded to the tab-forming reserved area (21) of the current collector (2) before the active material layer (3) is coated on the current collector (2), the active material layer (3) is dried after the active material layer (3) is coated on the current collector (2), and after the drying is completed, the structural adhesive paper (1) is peeled off to form the tab-forming reserved area (21).
9. A method for preparing a structural adhesive paper (1) according to any one of claims 1 to 8, comprising the steps of:
stirring the first adhesive (111), the foaming agent particles (112) and the first solvent to prepare a slurry of the first adhesive layer (11);
stirring the second adhesive (131) and a second solvent to prepare slurry of the second adhesive layer (13);
arranging slurry of a first adhesive layer (11) on a base material (12), arranging a groove in the first adhesive layer (11), heating to a first temperature, drying to remove a first solvent, wherein the first temperature is lower than the foaming temperature of foaming agent particles (112) and ensures that the foaming agent particles (112) are distributed in the first adhesive (111), so that the dried first adhesive (111) can be adhered to an adhered object, and the surface of the first adhesive (111) adhered to the adhered object is a first surface (111S);
arranging the slurry of the second adhesive layer (13) at the corresponding position of the groove, heating to a second temperature, and drying to remove the second solvent, wherein the second temperature is lower than the foaming temperature of the foaming agent particles (112), so that the dried second adhesive layer (13) can be adhered to an adhered object, and the surface of the second adhesive layer (13) far away from the base material (12) is a second surface (13S);
heating to a third temperature and keeping for a period of time to cure the first adhesive layer (11) and the second adhesive layer (13), wherein the third temperature is lower than the foaming temperature of the foaming agent particles (112), and finishing the preparation of the structural adhesive paper (1);
after the structural adhesive paper (1) is bonded to the bonded object, the structural adhesive paper (1) is heated, when the heating temperature of the structural adhesive paper (1) is higher than the foaming temperature of the foaming agent particles (112), the second adhesive layer (13) is kept bonded with the bonded object without being separated, the foaming agent particles (112) in the first adhesive layer (11) are foamed, wherein part of the foaming agent particles (112) are exposed out of the first surface (111S) after being foamed, and the sum of the sectional areas of the part of the foaming agent particles (112) along the first surface (11S) is not less than 70% of the area of the first surface (11S).
10. The method for preparing a structural adhesive paper (1) according to claim 9, wherein after the first solvent is removed by heating to the first temperature and drying, the residual amount of the first solvent is less than 1% of the total weight of the slurry of the first adhesive layer (11).
11. The method for preparing a structural adhesive paper (1) according to claim 9, wherein after the second solvent is removed by heating to the second temperature and drying, the residual amount of the second solvent is less than 1% of the total weight of the slurry of the second adhesive layer (13).
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CN112500809B (en) * 2020-12-01 2022-03-18 东莞新能源科技有限公司 Adhesive paper and preparation method of lithium ion battery pole piece using said adhesive paper
CN112795321B (en) * 2020-12-30 2023-01-31 浙江锂威能源科技有限公司 Gummed paper for realizing tab slot position, preparation method of pole piece, pole piece and lithium ion battery
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