WO2023190418A1 - 糸状粘着体の貼付方法及び糸状粘着体接合体 - Google Patents

糸状粘着体の貼付方法及び糸状粘着体接合体 Download PDF

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Publication number
WO2023190418A1
WO2023190418A1 PCT/JP2023/012349 JP2023012349W WO2023190418A1 WO 2023190418 A1 WO2023190418 A1 WO 2023190418A1 JP 2023012349 W JP2023012349 W JP 2023012349W WO 2023190418 A1 WO2023190418 A1 WO 2023190418A1
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Prior art keywords
adhesive
filamentous
shear strength
adherend
filamentous adhesive
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PCT/JP2023/012349
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English (en)
French (fr)
Japanese (ja)
Inventor
佳世 下川
裕充 森下
淳 ▲高▼嶋
陽介 巻幡
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to JP2024512499A priority Critical patent/JPWO2023190418A1/ja
Publication of WO2023190418A1 publication Critical patent/WO2023190418A1/ja
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds

Definitions

  • the present invention relates to a method for pasting a filamentous adhesive and a filamentous adhesive bonded body.
  • Adhesive members such as double-sided tape are sometimes used when bonding two or more types of articles together, but bonding is difficult when the shapes of the articles to be bonded are complex or the bonding area is narrow.
  • it is necessary to cut the double-sided tape into narrow widths and punch it, which is disadvantageous in terms of total cost due to the large number of man-hours and amount of waste.
  • the strength of the base material of double-sided tape is insufficient, it is impossible to rework the rigid bodies.
  • a filamentous adhesive is used. Since the filamentous adhesive has a high tensile strength, it can be pulled off even if it is included in a bonded body of rigid bodies. Furthermore, it can be bonded to complex shapes or minute shapes, and there is no need for post-processing of the tape, which is advantageous in terms of cost.
  • Patent Document 1 describes a thread-like adhesive body that does not require a release paper and can be freely drawn in a curved shape.
  • Patent Document 2 describes a filamentous adhesive article having an adhesive body including an adhesive layer having a specific gel fraction.
  • Patent Document 3 describes a filament-like adhesive article that includes a multifilament yarn having four or more filaments as a core material.
  • the filamentous adhesive since the filamentous adhesive has the above-mentioned excellent properties, it can be used for various purposes. Therefore, various mechanical properties are required of a bonded body formed by bonding adherends with a filamentous adhesive, and it is desired to solve these requirements by the adhesive properties exhibited by the filamentous adhesive.
  • Patent Documents 1 to 3 do not describe or suggest any specific means for achieving desired adhesive properties of the bonded body using the filamentous adhesive.
  • the present invention is as follows.
  • a method for pasting a filamentous adhesive A step of attaching the filamentous adhesive body to an adherend in the following shape, Here, the shape is obtained by placing an ABS resin plate on top of the filamentous adhesive of an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) plate to which the filamentous adhesive is adhered, and then pressing the filamentous adhesive to create a 0.
  • a tensile test was carried out at a tensile rate of 300 mm/min at a temperature of 25°C on a sample bonded body that had been crimped for 10 seconds under a pressure of 35 MPa, and the load [N] at the time of shear failure was calculated as the filament adhesive.
  • the shear strength Q (0°) in the direction where the shear strength is maximum and the shear strength
  • An attachment method in which the shear strength Q (90°) in a direction that is 90° with respect to the direction in which the strength is maximum satisfies the following relationship. 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1 [2]
  • the filamentous adhesive body includes a filamentous core material and an adhesive layer covering the periphery of the core material.
  • the core material has a tensile breaking strength of 100 N/mm 2 or more,
  • the tensile strength at break is determined by carrying out a tensile test on the core material at a temperature of 25° C. at a tensile rate of 300 mm/min, and calculating the load [N] at the time of tensile breakage by the cross-sectional area of the filamentous adhesive.
  • An adhesive body in which a filamentous adhesive body is attached to a first adherend The thread-like adhesive body is attached to the first adherend in the following shape,
  • the shape is obtained by placing an ABS resin plate on top of the filamentous adhesive of an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) plate to which the filamentous adhesive is adhered, and then pressing the filamentous adhesive to create a 0.
  • a tensile test was carried out at a tensile rate of 300 mm/min at a temperature of 25°C on a sample bonded body that had been crimped for 10 seconds under a pressure of 35 MPa, and the load [N] at the time of shear failure was calculated as the filament adhesive.
  • shear strength [N/mm 2 ] converted per unit area [mm 2 ] of the adhesive area of the body to the ABS resin plate Regarding the shear strength [N/mm 2 ] converted per unit area [mm 2 ] of the adhesive area of the body to the ABS resin plate, the shear strength Q (0°) in the direction where the shear strength is maximum, and the shear strength
  • An adhesive body having a shape in which shear strength Q (90°) in a direction that is 90° with respect to the direction in which the strength is maximum satisfies the following relationship. 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1 [5]
  • a second adherend is disposed on the filamentous adhesive included in the patch according to [4], and the first adherend and the second adherend are joined. zygote.
  • the step of arranging a second adherend on the filamentous adhesive body included in the patch according to [4] and joining the first adherend and the second adherend is included. , a method for manufacturing a zygote.
  • the present invention it is possible to provide a method for attaching a filamentous adhesive that exhibits stable adhesive properties against external forces in any shearing direction and has excellent reworkability. Further, according to the present invention, it is possible to provide a pasted body of thread-like adhesive material that exhibits stable adhesive properties against external forces in any shearing direction and has excellent reworkability, and a bonded body containing the same. .
  • FIG. 1 is a schematic diagram of a thread-like adhesive body that can be used in the pasting method of the present invention.
  • FIG. 2 is a schematic diagram showing an example of a preferable shape of the filamentous adhesive to be applied according to the application method of the present invention.
  • FIG. 3 is a schematic diagram showing another example of a preferable attachment shape of the thread-like adhesive body according to the attachment method of the present invention.
  • FIG. 4 is a schematic diagram showing an example of the shape of a thread-like adhesive body applied by a different application method to that of the present invention.
  • FIG. 5 is a diagram for explaining how to determine the aspect ratio in one aspect of the attached shape of the filamentous adhesive body.
  • FIG. 6 is a diagram for explaining how to determine the aspect ratio in another embodiment of the pasting shape of the filamentous adhesive body.
  • FIG. 7 is a schematic diagram showing still another example of the preferred shape of the filamentous adhesive to be applied according to the application method of the present invention.
  • the method for attaching a filamentous adhesive of the present invention includes the step of attaching the filamentous adhesive to an adherend in the following shape, where the shape is made of ABS resin (acrylonitrile-butadiene) to which the filamentous adhesive is attached.
  • An ABS resin plate was further placed on the thread-like adhesive body of the (styrene copolymer synthetic resin) plate, and the sample bonded body was pressed for 10 seconds under a pressure of 0.35 MPa using a press machine.
  • a tensile test was conducted under temperature conditions at a tensile speed of 300 mm/min, and the load [N] at the time when shear failure occurred was converted to the unit area [mm 2 ] of the adhesive area of the filamentous adhesive to the ABS resin plate.
  • the shear strength Q (0°) in the direction where the shear strength is maximum, and the shear strength Q (90 °) in the direction that is 90 ° with the direction where the shear strength is maximum is a shape that satisfies the following relationship. 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1
  • the term "adhesive body” refers to a thing formed by pasting a filamentous adhesive body onto an adherend.
  • the term “conjugated body” refers to a product in which an additional adherend is placed on the patch body, and two or more adherends are joined by a filamentous adhesive.
  • the method for attaching the filamentous adhesive of the present invention is to apply shear strength Q (0°) in the direction in which the shear strength is maximum, and shear strength Q (90 °) in the direction that is 90° to the direction in which the shear strength is maximum.
  • the method includes the step of attaching the filamentous adhesive to an adherend in a shape that satisfies the following relationship. 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1
  • the shear strength Q (0°) in the direction where the shear strength is maximum and the shear strength Q (90°) in the direction that is 90° to the direction where the shear strength is maximum are: Q(0°) ⁇ Q(90°) Therefore, the lower limit value of Q(0°)/Q(90°) is 1.0 and will never be less than 1.0.
  • the maximum value of Q(0°)/Q(90°) is preferably less than 1.08, more preferably less than 1.05. If Q(0°)/Q(90°) is 1.1 or more, the adhesive properties may vary depending on the shear direction. Such an attachment method is not suitable for applications that require stable adhesive properties against external forces in all shear directions.
  • the shear strength Q (0°) in the direction where the shear strength is maximum and the shear strength Q (90°) in the direction that is 90° to the direction where the shear strength is maximum are determined by the following method. Desired. First, an ABS resin plate is further placed on top of the filamentous adhesive body of the ABS resin plate to which the filamentous adhesive body has been attached, and a bonded body for a sample is obtained by pressing the ABS resin plate with the filamentous adhesive body for 10 seconds under a pressure of 0.35 MPa using a press machine.
  • the sample bonded body was set in a tensile testing machine and pulled at a tensile speed of 300 mm/min at a temperature of 25°C, and the load [N] at which shear failure occurred was calculated as the adhesive area of the filamentous adhesive to the ABS resin plate.
  • the shear strength [N/mm 2 ] converted per unit area [mm 2 ] of is determined in a plurality of directions.
  • the two ABS resin plates were pressed together for 10 seconds under a pressure of 0.35 MPa using a press machine to form a bonded sample. Arrange so that the filamentous adhesive does not protrude even after installation.
  • the measurement results are stable, so we conducted a tensile test on the sample bonded body with the tensile direction passing through the center of gravity of the filament adhesive. It is preferable to set it on a machine.
  • the shear strength in the direction where the shear strength is maximum is Q (0°). Further, the shear strength in a direction that is 90 degrees to the direction in which the shear strength is maximum is Q (90 degrees). Note that when there are multiple directions in which the shear strength is maximum, Q (0°) and Q (90°) are measured in each case, and Q (0°)/Q (90°) is determined. Among these, Q(0°)/Q(90°) which is the maximum value is adopted as Q(0°)/Q(90°) in this specification.
  • ABS resin plate used for the measurement a commercially available one can be used, such as Kobe Polysheet ABS plate (manufactured by Showa Denko Materials Co., Ltd.).
  • a commercially available press machine can be used to create the sample bonded body, and for example, a servo press machine (manufactured by Hitachi Chemical Co., Ltd.) can be used. Furthermore, a commercially available tensile tester can be used for the tensile test of the sample bonded body, and for example, AG-X/R (manufactured by Shimadzu Corporation) can be used.
  • the pasting method of the present invention uses a filamentous adhesive. Even when the filamentous adhesive body is included in a bonded body of rigid bodies, it can be pulled off. Therefore, compared to the conventional pasting method using double-sided tape, reworkability is excellent, the adherend can be easily reused, and the pasting method of the present invention is superior in terms of both environment and cost.
  • the filamentous adhesive used in the pasting method of the present invention will be described.
  • the filamentous adhesive used in the pasting method of the present invention is not particularly limited as long as it is filamentous and exhibits adhesiveness, but includes a filamentous core material and an adhesive layer covering the periphery of the core material. It is preferable to include.
  • FIG. 1 is a schematic diagram showing one embodiment of the thread-like adhesive body 1.
  • the filamentous adhesive body 1 is constituted by a linear adhesive body consisting of a linear core material 1a and an adhesive layer 1b covering the longitudinal surface of the core material 1a.
  • the filamentous adhesive body 1 is an elongated adhesive body and has a linear shape.
  • linear as used herein is a concept that includes not only a straight line, a curved line, and a broken line, but also a state that can be bent in various directions and angles like a thread (that is, a thread-like state).
  • the adhesive layer in this specification also includes a linear adhesive layer.
  • cross-sectional shape of the filamentous adhesive body 1 in this configuration example is circular, the present embodiment is not limited to this, and the cross-sectional shape may be rectangular such as an oval or a square in addition to the circular shape. etc. can be taken.
  • the adhesive layer 1b includes an adhesive formed from an adhesive composition.
  • the adhesive is not particularly limited, and any known adhesive can be used.
  • acrylic adhesives, rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine adhesives, epoxy adhesives, etc. Can be mentioned.
  • acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, or polyester adhesives are preferred, and acrylic adhesives are particularly preferred.
  • only one type of adhesive may be used alone, or two or more types may be used in combination.
  • the adhesive in this embodiment is a pressure-sensitive adhesive that is sticky at room temperature and can attach an adherend to the surface of the adherend by the pressure generated when the surface of the adhesive comes into contact with the surface of the adherend. It is preferable that there be. Pressure-sensitive adhesives do not require heating and can be applied to adherends that are sensitive to heat.
  • both solvent-based adhesives and water-dispersed adhesives can be used as the adhesive; crosslinking progresses as the adhesive composition dries (solvent evaporates), and crosslinking occurs after drying. It is preferable that the process be completed quickly. This is to prevent new crosslinking from occurring after the surfaces of the adhesive layers come into contact with each other.
  • a water-dispersible adhesive is preferable because it can be applied at high speed, is environmentally friendly, and has less influence (swelling, dissolution) on the base material and core material due to solvents, and a water-dispersible acrylic adhesive. agent is more preferred.
  • the adhesive layer may cover the entire surface of the core material (the surface in the longitudinal direction), or may cover only at least a part of the surface of the core material. .
  • the adhesive layer is typically formed continuously, it is not limited to this form, and may be formed in a regular or random pattern such as dots or stripes.
  • the end surface of the core material may or may not be covered with an adhesive layer. For example, if the adhesive body is cut during the manufacturing process or during use, the end surface of the core material may not be covered with the adhesive layer.
  • resins include polyolefins such as polyethylene (PE), polypropylene (PP), ethylene/propylene copolymers, and ethylene/vinyl acetate copolymers; polyesters such as polyethylene terephthalate (PET); vinyl chloride resins; vinyl acetate resins. ; polyimide resin; polyamide resin; fluororesin and the like.
  • PET polyethylene terephthalate
  • vinyl chloride resins vinyl acetate resins.
  • polyimide resin polyamide resin
  • fluororesin and the like examples of rubber include natural rubber, synthetic rubber such as urethane rubber, and the like.
  • foams include foamed polyurethane, foamed polychloroprene rubber, and the like.
  • fibers include glass fibers, carbon fibers, metal fibers, chemical fibers (regenerated fibers, semi-synthetic fibers, synthetic fibers, etc.), natural fibers (vegetable fibers, animal fibers, etc.), and the like.
  • the cross-sectional shape of the core material is not particularly limited, but it usually has a cross-sectional shape that corresponds to the cross-sectional shape of the adhesive body.
  • the material of the thread-like core material that can be used for the thread-like adhesive body 1, rayon, cupro, acetate, promix, nylon, aramid, vinylon, vinylidene, polyvinyl chloride, polyester, acrylic, polyethylene, polypropylene, polyurethane, Various polymer materials such as polyclar and polylactic acid, various rubbers such as glass, carbon fiber, synthetic rubber such as natural rubber and polyurethane, natural materials such as cotton and wool, metals, etc. can be used.
  • examples of the form of the thread-like core material include, in addition to monofilament, multifilament, spun yarn, processed yarn that has undergone crimping, bulking, etc. and is generally called textured yarn, bulky yarn, and stretch yarn.
  • the cross-sectional shape is not limited to a circular shape, but may also be a rectangular thread such as a square shape, a star shape, an elliptical shape, a hollow shape, or the like.
  • the core material may contain fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, etc.), as necessary. , dyes, etc.) may be blended.
  • the surface of the core material may be subjected to known or conventional surface treatments such as corona discharge treatment, plasma treatment, and application of a primer.
  • the tensile strength at break of the core material is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of improving reworkability, it is preferably 100 N/mm 2 or more, more preferably 200 N/mm 2 or more. , more preferably 300 N/mm 2 or more.
  • the tensile strength at break refers to the tensile strength when a core material is subjected to a tensile test at a temperature of 25°C and a tensile rate of 300 mm/min, and the load [N] at the time of tensile breakage is equal to the cross-sectional area of the filamentous adhesive. It refers to the value [N/mm 2 ] converted per unit area [mm 2 ].
  • an apparatus similar to the above-mentioned apparatus used for the tensile test of the sample bonded body can be used.
  • the cross-sectional size of the core material is not particularly limited and can be selected as appropriate depending on the purpose, but for example, in the case of a circular cross-sectional shape, from the viewpoint of handling properties (flexibility, difficulty in cutting), the diameter is preferably It is 1 ⁇ m to 2000 ⁇ m, more preferably 10 ⁇ m to 1000 ⁇ m, and still more preferably 200 ⁇ m to 600 ⁇ m.
  • the thickness of the adhesive layer is not particularly limited, but from the viewpoint of adhesiveness, it is preferably, for example, 1 ⁇ m or more, and more preferably 3 ⁇ m or more. Further, from the viewpoint of thickness unevenness and drying properties, the thickness is preferably 200 ⁇ m or less, and more preferably 150 ⁇ m or less, for example. Furthermore, by laminating layers, the thickness can be increased depending on the application.
  • the adhesive forming the adhesive layer 1b is sticky at room temperature, and the pressure generated when the surface of the adhesive contacts the surface of the adherend causes the adherend to be attached to the surface.
  • it is a pressure-sensitive adhesive that can be pasted.
  • a pressure-sensitive adhesive does not require heating and can be applied to adherends that are sensitive to heat.
  • the shape of the filamentous adhesive body 1 is not particularly limited, but the long axis (the center of gravity of the cross section) is The longer the length ratio (major axis/minor axis) of the axes passing through the filament, the flatter the shape of the filamentous adhesive body 1 becomes.
  • the smaller the ratio is the closer the cross-sectional shape of the filamentous adhesive body 1 is to a circle, and the ratio has a minimum value of 1 when the cross-sectional shape is circular.
  • special shapes such as triangles and stars are also included.
  • the shape to which the filamentous adhesive material is applied in the application method of the present invention is not particularly limited as long as it satisfies the above-mentioned relationship of 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1.
  • Preferred examples of the shape to which the filamentous adhesive material is applied in the application method of the present invention are shown below, but the present invention is not limited to these examples.
  • FIG. 2 shows a preferred embodiment of the shape of the filamentous adhesive to be applied in the application method of the present invention.
  • examples of such are (a) circular, (b) spiral (3 turns) and (c) spiral (5 turns).
  • the number of circumferences of the spiral circle is determined by the number of times the spiral circle crosses the straight line connecting the outermost starting point of the spiral circle and the center of gravity. For example, when a spiral circle that starts from the outermost point reaches a straight line connecting the starting point and the center of gravity, it is considered to have made one turn, and when it reaches the next straight line, it has made two turns.
  • a similar idea can be applied to a spiral rectangle, which will be described later.
  • FIG. 3 shows another preferred embodiment of the shape of the filamentous adhesive to be applied in the application method of the present invention.
  • this include (d) a quadrilateral, (e) a quadrilateral with partially overlapping parts (an overlapping quadrilateral), (f) a spiral quadrilateral (three turns), and (g) a spiral quadrilateral (five turns). I can do it.
  • FIG. 4 shows an embodiment different from the shape in which the filamentous adhesive is pasted in the pasting method of the present invention. Examples of this include (h) stripes (4 lines) and (i) waveforms (5 peaks and 4 valleys).
  • Such shapes (h) and (i) different from the shape in which the filamentous adhesive is pasted in the pasting method of the present invention are based on the above-mentioned 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1. This is a typical example where relationship 1 is not satisfied.
  • a method of attaching a filamentous adhesive having such a shape may have different adhesive properties depending on the direction of shear, and is therefore not suitable for applications that require stable adhesive properties against external forces in all directions of shear.
  • Whether or not the method of attaching the filamentous adhesive material corresponds to the method of attaching the present invention can be determined using the aspect ratio of the attached shape as a guide.
  • the aspect ratio is the ratio (b/a ) is defined as
  • the aspect ratio of the pasted shape for the spiral circle (3 turns) in FIG. 2(b) can be determined as shown in FIG. First, draw a rectangle that touches the outer circumference of the first spiral circle. The lengths of the sides of the quadrilaterals are compared, and the longer one is designated b1 and the shorter one is designated a1. At this time, b1 is the length in the direction where the shear strength is maximum, and a1 is the length in the direction making 90 degrees with the direction where the shear strength is maximum.
  • a rectangle touching the outer periphery of the second and third spiral circles can be drawn in the same way, and the lengths of the sides of the rectangle are b2 and b3 (the length in the direction where the shear strength is maximum), and a2 and a3 (the length in the direction making 90° with the direction in which the shear strength is maximum).
  • the aspect ratio of the pasted shape for the waveform (5 peaks, 4 valleys) in FIG. 4(i) can be determined as shown in FIG. 6.
  • the length obtained by doubling the amplitude of the wave and the length half the period of the wave are compared, and the longer one is designated as b, and the shorter one is designated as a.
  • b is the length in the direction where the shear strength is maximum
  • a is the length in the direction making 90 degrees with the direction where the shear strength is maximum.
  • the length that is twice the amplitude of the wave is b, and the length that is half the wave period is a.
  • both the length that is twice the amplitude of the wave and the length that is half the period of the wave can be either a or b.
  • the aspect ratio of the pasting shape is preferably less than 1.5, more preferably less than 1.4, even more preferably less than 1.3, the above-mentioned 1.0 ⁇ Q(0°)/Q (90°) ⁇ 1.1 tends to be satisfied. Further, since there is a relationship of bn ⁇ an or b ⁇ a, the lower limit of the aspect ratio of the pasted shape is 1.0.
  • a single stroke shape is illustrated as an example of the shape to which the filamentous adhesive is pasted, but the above relationship of 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1 It is clear that the shape is not limited to a single stroke as long as it satisfies the requirements.
  • shapes that are not drawn in one stroke include, for example, multiple circles such as double circles and triple circles, and multiple squares such as double squares and triple squares. can be mentioned.
  • the aspect ratio of the pasted shape in these shapes can also be determined according to the above-mentioned method.
  • the filamentous adhesive body be pasted in a shape other than a star, rectangle, or triangle.
  • the adherend that can be used in the pasting method of the present invention is not particularly limited as long as it can be pasted with the above-mentioned filamentous adhesive.
  • the adherend include ABS resin, PC (polycarbonate) resin, acrylic resin, and metal. There are no particular restrictions on the shape of the adherend.
  • the adhesive body of the present invention is an adhesive body in which a filamentous adhesive is adhered to a first adherend, and the filamentous adhesive is adhered to the first adherend in the following shape.
  • the shape is obtained by placing an ABS resin plate on top of the filamentous adhesive of the ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) plate to which the filamentous adhesive has been attached, and then pressing the filamentous adhesive to create a 0.
  • a tensile test was carried out at a tensile rate of 300 mm/min at a temperature of 25°C on a sample bonded body that had been crimped for 10 seconds under a pressure of 35 MPa, and the load [N] at the time of shear failure was calculated as the filament adhesive.
  • the shear strength [N/mm 2 ] converted per unit area [mm 2 ] of the adhesive area of the body to the ABS resin plate Regarding the shear strength [N/mm 2 ] converted per unit area [mm 2 ] of the adhesive area of the body to the ABS resin plate, the shear strength Q (0°) in the direction where the shear strength is maximum, and the shear strength
  • the shape is such that the shear strength Q (90°) in a direction that is 90° with respect to the direction in which the strength is maximum satisfies the following relationship. 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1
  • Q (0°) and Q (90°) are determined as described above.
  • the preferable range of Q(0°)/Q(90°) and the preferable form of the shape to which the filamentous adhesive is attached are also as described above.
  • the adhesive body of the present invention can provide a bonded body that exhibits stable adhesive properties against external forces in any shearing direction and has excellent reworkability.
  • a second adherend is disposed on the filamentous adhesive included in the above-mentioned patch, and the first adherend and the second adherend are joined.
  • the bonded body of the present invention is a bonded body in which three or more adherends are bonded, such as a filamentous adhesive further pasted on the second adherend and a third adherend placed thereon. It may also be something that has been done. In such a case, as long as the method of attaching the filamentous adhesive in joining at least one set of adherends is in accordance with the present invention, the joined body of the present invention can be considered regardless of the manner of joining of other adherends. can.
  • the joined body of the present invention exhibits stable adhesive properties against external forces in any shearing direction, and has excellent reworkability.
  • the second adherend As the second adherend in the joined body of the present invention, those listed above as the adherend can be used, and preferred embodiments are also the same.
  • the second adherend may be the same as the first adherend, or may be different.
  • Method for manufacturing joined body Although there are no particular limitations on the method for producing the bonded body of the present invention, for example, a second adherend is placed on the filamentous adhesive included in the above-mentioned patch, and the first adherend and the A manufacturing method including a step of joining two adherends can be mentioned.
  • the method for applying a patch body, the patch body, and the bonded body of the present invention can be suitably used for applications that require stable adhesive properties against external forces in all shear directions and excellent reworkability.
  • Examples of such uses include fixing electronic device parts (e.g., batteries, covers, etc.) for smartphones, digital cameras, wireless headphones, smart watches, etc., and temporary fixing in sewing processes (e.g., clothes, bags, etc.) etc. can be mentioned.
  • a method for pasting a filamentous adhesive A step of attaching the filamentous adhesive body to an adherend in the following shape,
  • the shape is obtained by placing an ABS resin plate on top of the filamentous adhesive of an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) plate to which the filamentous adhesive is adhered, and then pressing the filamentous adhesive to create a 0.
  • a tensile test was carried out at a tensile rate of 300 mm/min at a temperature of 25°C on a sample bonded body that had been crimped for 10 seconds under a pressure of 35 MPa, and the load [N] at the time of shear failure was calculated as the filament adhesive.
  • the shear strength Q (0°) in the direction where the shear strength is maximum and the shear strength
  • An attachment method in which the shear strength Q (90°) in a direction that is 90° with respect to the direction in which the strength is maximum satisfies the following relationship.
  • 1.0 ⁇ Q(0°)/Q(90°) ⁇ 1.1 ⁇ 2> The method according to ⁇ 1>, wherein the filamentous adhesive body includes a filamentous core material and an adhesive layer covering the periphery of the core material.
  • the core material has a tensile breaking strength of 100 N/mm 2 or more,
  • the tensile strength at break is determined by carrying out a tensile test on the core material at a temperature of 25° C. at a tensile rate of 300 mm/min, and calculating the load [N] at the time of tensile breakage by the cross-sectional area of the filamentous adhesive.
  • An adhesive body in which a filamentous adhesive body is attached to a first adherend The thread-like adhesive body is attached to the first adherend in the following shape,
  • the shape is obtained by placing an ABS resin plate on top of the filamentous adhesive of an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) plate to which the filamentous adhesive is adhered, and then pressing the filamentous adhesive to create a 0.
  • a tensile test was carried out at a tensile rate of 300 mm/min at a temperature of 25°C on a sample bonded body that had been crimped for 10 seconds under a pressure of 35 MPa, and the load [N] at the time of shear failure was calculated as the filament adhesive.
  • Monomer emulsion A contained 98 parts by mass of 2-ethylhexyl acrylate, 1.25 parts by mass of acrylic acid, 0.75 parts by mass of methacrylic acid, 0.05 parts by mass of lauryl mercaptan (chain transfer agent), and ⁇ -methacryloxypropyltrimethoxy. 0.02 parts by mass of silane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KBM-503”) and 2 parts by mass of sodium polyoxyethylene lauryl sulfate (emulsifier) were added to 30 parts by mass of ion-exchanged water and emulsified. used.
  • a multifilament yarn consisting of 7 polyester fibers (developed product, manufactured by Teijin Frontier Co., Ltd.) with a fineness of 167 dtex and a number of filaments of 48 twisted 70 times per 1 m was prepared.
  • Coating Solution 1 was applied to the core material by dipping using a coating roller rotating at the same speed as the feeding speed. Thereafter, it was dried at 100° C. for 1 minute to obtain a filamentous adhesive body A having a diameter (width in the width direction) of 450 ⁇ m.
  • Example 1 Two ABS resin plates (Kobe Polysheet ABS plate, manufactured by Showa Denko Materials Co., Ltd.) with dimensions of 30 mm x 60 mm x 2 mm were prepared.
  • the filamentous adhesive material A is pasted on one main surface (on a 30 mm x 60 mm surface) of an ABS resin plate in a circular shape (diameter 25 mm) as schematically shown in FIG. 2(a), and the pasted material is I got it.
  • Another ABS resin plate was placed so that its main surface was located on top of the pasted filamentous adhesive material A. Note that the two ABS resin plates were arranged with a 30 mm offset in the long side direction with the thread-like adhesive body A interposed therebetween.
  • ABS resin-thread-like adhesive A-ABS resin laminate was pressed for 10 seconds under a pressure of 0.35 MPa using a press machine (servo press machine, manufactured by Daiichi Dentsu Inc.), and then further pressed for 30 seconds. By curing for a minute, a sample zygote of Example 1 was obtained. Further, the adhesion area of the filamentous adhesive to the adherend was calculated from the adhesive width and attachment length of the filamentous adhesive to be 52.2 mm 2 .
  • Example 2 The sample of Example 2 was prepared in the same manner as in Example 1, except that the thread-like adhesive material A was attached so as to form a spiral shape (3 circumferences, outer diameter of 25 mm) schematically shown in FIG. 2(b). A zygote was obtained. In addition, the pitch of the filamentous adhesive material A in the spiral shape was 2 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated from the adhesive width and attachment length of the filamentous adhesive to be 97.2 mm 2 .
  • Example 3 The sample of Example 3 was prepared in the same manner as in Example 1, except that the filamentous adhesive material A was attached so as to form a spiral shape (5 circumferences, outer diameter of 25 mm) as schematically shown in FIG. 2(c). A zygote was obtained. In addition, the pitch of the filamentous adhesive material A in the spiral shape was 2 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated to be 162 mm 2 from the adhesion width and attachment length of the filamentous adhesive.
  • Example 4 A sample bonded body of Example 4 was obtained in the same manner as in Example 1, except that the thread-like adhesive material A was attached so as to form a square (25 mm on a side) schematically shown in FIG. 3(d). . Further, the adhesion area of the filamentous adhesive to the adherend was calculated to be 60.0 mm 2 from the adhesion width and attachment length of the filamentous adhesive.
  • Example 1 was carried out in the same manner as in Example 1, except that the filamentous adhesive material A was attached to form a rectangle (outermost side 25 mm) having an overlapping part of 10 mm as schematically shown in FIG. 3(e). A sample zygote of No. 5 was obtained. In addition, the pitch of the filamentous adhesive material A in the rectangular overlapping portion was 2 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated to be 66.0 mm 2 from the bonding width and attachment length of the filamentous adhesive.
  • Example 6 was prepared in the same manner as in Example 1, except that the thread-like adhesive material A was attached to form a spiral rectangle (3 circumferences, 25 mm on the outermost side) schematically shown in FIG. 3(f). A sample conjugate was obtained. In addition, the pitch of the filamentous adhesive material A in the spiral rectangle was 2 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated to be 150 mm 2 from the adhesion width and attachment length of the filamentous adhesive.
  • Example 7 was prepared in the same manner as in Example 1, except that the filamentous adhesive material A was attached to form a spiral rectangle (5 circumferences, 25 mm on the outermost side) schematically shown in FIG. 3(g). A sample conjugate was obtained. In addition, the pitch of the filamentous adhesive material A in the spiral rectangle was 2 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated to be 201 mm 2 from the bonding width and attachment length of the filamentous adhesive.
  • Comparative example 1 A sample bonded body of Comparative Example 1 was obtained in the same manner as in Example 1, except that the filamentous adhesive material A was attached so as to form stripes (4 rows) schematically shown in FIG. 4(h). .
  • the stripes were formed by arranging linear filamentous adhesive bodies A each having a length of 25 mm in four rows at a pitch of 8 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated from the bonding width and attachment length of the filamentous adhesive to be 48.0 mm 2 .
  • Comparative example 2 The sample bonded body of Comparative Example 2 was prepared in the same manner as in Example 1, except that the filamentous adhesive material A was attached so as to have the waveform (5 peaks, 4 valleys) schematically shown in FIG. 4(i). Obtained. Note that the waveform had a wave amplitude of 12.5 mm (twice the wave amplitude is 25 mm), and the pitch of the straight portions of the filamentous adhesive A was 2.5 mm. Further, the adhesion area of the filamentous adhesive to the adherend was calculated from the bonding width and attachment length of the filamentous adhesive to be 141 mm 2 .
  • Comparative example 3 A sample bonded body of Comparative Example 3 was obtained in the same manner as in Comparative Example 2 except that filamentous adhesive body A was changed to filamentous adhesive body B. Further, the adhesion area of the filamentous adhesive to the adherend was calculated from the bonding width and attachment length of the filamentous adhesive to be 141 mm 2 .
  • Comparative example 4 A sample bonded body of Comparative Example 4 was obtained in the same manner as in Example 1, except that a 25 mm x 25 mm double-sided tape EW514 (manufactured by Nitto Denko Corporation) was attached instead of filamentous adhesive A. Further, the adhesive area of the double-sided tape to the adherend was 625 mm 2 .
  • the tensile strength at break of the filamentous adhesive and the double-sided tape was measured using a tensile testing machine. The measurement was carried out at a temperature of 25° C. and a tensile speed of 300 mm/min. The load [N] at the time when the filamentous adhesive body or double-sided tape broke was divided by the cross-sectional area [mm 2 ] of the filamentous adhesive body or double-sided tape to obtain the tensile strength at break [N/mm 2 ]. The results are shown in Tables 1 and 2.
  • the attached bodies and bonded bodies obtained by the method of attaching the filamentous adhesive bodies of Examples 1 to 7 exhibited stable adhesive properties against external forces in all shear directions, and exhibited excellent reworkability.
  • the pasted bodies and bonded bodies obtained by the method of pasting the filamentous adhesive bodies of Comparative Examples 1 to 3 showed excellent reworkability, the adhesive properties against external forces were uneven depending on the shear direction.
  • the pasted body and bonded body obtained by the double-sided tape pasting method of Comparative Example 4 exhibited stable adhesive properties against external forces in all shear directions, they were inferior in reworkability.
  • the method for attaching a filamentous adhesive body of the present invention it is possible to provide a method for attaching a filamentous adhesive body that exhibits stable adhesive properties against external forces in any shear direction and has excellent reworkability. Therefore, it is applicable to adhesive applications in various fields.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
  • Connection Of Plates (AREA)
PCT/JP2023/012349 2022-03-29 2023-03-27 糸状粘着体の貼付方法及び糸状粘着体接合体 Ceased WO2023190418A1 (ja)

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