JP2007097283A - Automotive wire harness fixing adhesive sheet and automotive molded parts - Google Patents

Abstract

An object of the present invention is to provide an excellent adhesive force to a molded part for automobiles having a material such as a raised nonwoven fabric or a rough paper on the surface, excellent followability to the uneven shape of the molded part for automobiles, and the wire harness to be linear. It has high repulsion resistance to counter the repulsive force to be attempted, and thus it is possible to stably fix the wire harness to the molded parts for automobiles, and it has flame retardancy and has excellent manufacturing suitability. A pressure-sensitive adhesive sheet for fixing an automobile wire harness is provided.
SOLUTION: An adhesive sheet used for fixing an automobile wire harness to a molded part for an automobile, wherein the adhesive sheet has a structure in which a soft metal foil, a foamed resin layer, and an adhesive layer are laminated in this order. An adhesive sheet for fixing an automobile wire harness, wherein a groove is provided on the surface of the soft metal foil.
[Selection] Figure 1

Description

  The present invention relates to an adhesive sheet used for fixing an automotive wire harness (assembled electric wire) to an automotive molded part in which a mechanism that requires power supply such as a molded ceiling (roofing), a bumper, and a door trim is installed. The present invention relates to a manufacturing method, a method for fixing an automobile wire harness using the pressure-sensitive adhesive sheet, and a molded part for automobile in which the wire harness for automobile is fixed using the pressure-sensitive adhesive sheet.

  In the assembly line of automobiles, to reduce the required man-hours, a bundle of wires for feeding power to room lamps, etc. on the back side of molded parts for automobiles where mechanisms that require power feeding such as molded ceilings, bumpers, and door trims are installed. These molded parts for automobiles are supplied after fixing (hereinafter abbreviated as “wire harness”) in advance and modularizing.

  For fixing the wire harness to the back side of the molded parts for automobiles where the power supply mechanism such as these molded ceilings, bumpers, door trims, etc. is installed, the work is easy, the layout of the wire harness, the fixing position of the wire harness For reasons such as easy design changes, adhesive sheets with adhesive layers on one side of substrates such as vinyl chloride and polyolefin plastic films, adhesive tapes with double-sided tapes attached to these various substrate layers, etc. A method of sticking and fixing the wire around the wire harness is used.

  Conventionally, molded ceilings, door trims, and the like have a structure in which a material such as a plastic film or a sheet is bonded to a hard resin material in order to block noise outside the vehicle. However, in recent years, a higher level of interior silence has been demanded, and molded ceilings, door trims, etc. have changed to a structure in which a material such as nonwoven fabric or paper that has high air permeability is bonded to a flexible material such as urethane resin. Yes.

For such non-woven fabrics with raised surfaces and paper-based materials with rough surfaces, the contact surface of the pressure-sensitive adhesive sheet is point-bonded, so module components such as molded ceilings and door trims must be stood and transported to the assembly line. In addition, there is a problem that the pressure-sensitive adhesive sheet is peeled off due to a load applied to the pressure-sensitive adhesive sheet. In particular, molded parts for automobiles have a concavo-convex shape, and when trying to fix the wire harness along this concavo-convex shape, the repulsive force of the wire harness becoming a linear shape acts on the adhesive sheet, and the adhesive sheet becomes short in time. There was a problem of peeling off.
Therefore, a method has been proposed in which an adhesive tape and welding with a welding gun such as ultrasonic welding or high-frequency welding are used in combination (for example, see Patent Document 1).
JP 2004-306741 A

  However, the method described in Patent Document 1 has a problem in that the number of processes using a welding gun is increased and workability is deteriorated, and work requires skill.

In addition, materials used for automobile interior parts such as molded ceilings, bumpers, and door trims are flame retardant and self-extinguishing when ignited for the purpose of preventing fire or spreading fire for passenger safety ( It is preferable that such flame retardancy is also imparted to the pressure-sensitive adhesive sheet that fixes the wire harness to the back side of a molded ceiling or the like. Examples of methods for imparting flame retardancy to the pressure-sensitive adhesive sheet include the use of a flame-retardant substrate or the addition of a flame retardant into the pressure-sensitive adhesive. Examples thereof include a resin sheet added with a flame retardant. However, when only the metal foil is used as the base material, the metal foil has the advantage of preventing the spread of the adhesive without adding a flame retardant into the adhesive forming the adhesive layer, Since it is a hard base material compared with a resin sheet and is firm, there is a problem that followability to an adherend is poor and the adhesive sheet peels off when a load is applied. In addition, when using a resin sheet with a flame retardant added as a base material, there is a concern that the adhesive layer will also burn if it does not have flame retardancy. is required. However, when a flame retardant is added to the pressure-sensitive adhesive, the initial adhesiveness is lowered and there is a problem that the peel resistance is inferior.
In this way, for automotive molded parts that have a surface such as a nonwoven fabric with a raised surface or a paper surface with a rough surface, an adhesive that combines flame resistance in addition to sufficient initial adhesive strength and resistance to peeling. Although it is required to use a sheet, the conventional pressure-sensitive adhesive sheet never satisfies these requirements.

  Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to provide excellent adhesion to molded parts for automobiles having materials such as brushed nonwoven fabrics and rough papers on the surface, and uneven shapes of molded parts for automobiles. Excellent trackability and high repulsion resistance to resist the repulsive force of the wire harness becoming a linear shape, which makes it possible to stably fix the wire harness to automotive molded parts And providing a pressure-sensitive adhesive sheet for fixing an automotive wire harness having flame retardancy and excellent manufacturing suitability, and a manufacturing method capable of manufacturing such a pressure-sensitive adhesive sheet for fixing a wiring harness for an automobile with stable quality. It is to provide.

  Moreover, the other object of this invention is to provide the molded component for motor vehicles which fixed the motor vehicle wire harness using the said adhesive sheet for motor vehicle wire harness fixation.

  Furthermore, the other object of this invention is to provide the fixing method to the molded component for motor vehicles of the wiring harness for motor vehicles using the said adhesive sheet for wire harness fixing for motor vehicles.

The inventors of the present invention have intensively studied to solve such problems, and as a result, have completed the present invention.
That is, the first invention of the present invention is an adhesive sheet used for fixing an automobile wire harness to an automotive molded part, the adhesive sheet comprising a soft metal foil, a foamed resin layer, and an adhesive layer. It is a pressure-sensitive adhesive sheet for fixing a wire harness for automobiles, characterized in that a groove is provided on the surface of the soft metal foil.

  Moreover, 2nd invention of this invention is the molded component for motor vehicles which fixed the wire harness for motor vehicles using the adhesive sheet for wire harness fixing for motor vehicles described in 1st invention.

  Furthermore, the third invention of the present invention is a method for manufacturing an automotive wire harness fixing pressure-sensitive adhesive sheet according to the first invention, and in the manufacturing process, before winding the pressure-sensitive adhesive sheet with a roll, A groove is provided on the surface of the soft metal foil in a direction perpendicular to the traveling direction of the pressure-sensitive adhesive sheet.

  Furthermore, the fourth invention of the present invention uses the automotive wire harness fixing adhesive sheet according to the first invention so that the automotive wire harness is parallel to a groove provided in the adhesive sheet. It is the fixing method of the wire harness for motor vehicles characterized by fixing to the molded component for motor vehicles.

  A base material layer having a two-layer structure in which a soft metal foil and a foamed resin layer are laminated is used for the pressure-sensitive adhesive sheet for fixing an automobile wire harness according to the present invention (hereinafter abbreviated as pressure-sensitive adhesive sheet). Thus, by using a soft metal foil for a part of the base material layer, the pressure-sensitive adhesive sheet of the present invention not only has high repulsion resistance that can sufficiently counter the repulsive force of the wire harness, but also a foamed resin. It is possible to prevent the layer and the pressure-sensitive adhesive layer from burning or spreading. In addition, since the foamed resin layer has an appropriate elasticity, when the pressure-sensitive adhesive layer is in contact with the surface of a material such as a raised nonwoven fabric or a rough paper-based material of an automotive molded part, The concave portion serves as a spring for pressing the pressure-sensitive adhesive layer, and the convex portion serves as a cushion for absorbing the convex portion. With such a function, the pressure-sensitive adhesive sheet of the present invention has excellent adhesion to molded parts for automobiles having materials such as brushed nonwoven fabrics and rough papers on the surface, and excellent follow-up to uneven shapes of molded parts for automobiles. It has sex.

  Moreover, the adhesive sheet of this invention shows the outstanding manufacturing aptitude by the groove | channel being provided in the surface of the soft metal foil. A base material layer having a two-layer structure in which a soft metal foil and a foamed resin layer are laminated may break due to stress when the soft metal foil is in a convex state by passing a roll during manufacture, for example. If the soft metal foil is cracked in this way, it not only causes manufacturing trouble, but the finished adhesive sheet loses flame retardancy. However, if the groove is provided in the direction perpendicular to the roll winding direction (advancing direction of the adhesive sheet) on the surface of the soft metal foil as in the adhesive sheet of the present invention, the surface area of the soft metal foil is reduced. By being larger than the surface area of the roll contact surface of the pressure-sensitive adhesive sheet, stress can be absorbed even when the soft metal foil is in a convex state, so that the pressure-sensitive adhesive sheet can be produced with stable quality.

  Furthermore, by using the pressure-sensitive adhesive sheet of the present invention, fixing the automotive wire harness to the molded automotive part so as to be parallel to the groove provided in the pressure-sensitive adhesive sheet, the followability to the automotive wire harness is further improved. Since it can raise, the fixation to the molded component for motor vehicles of the wire harness for motor vehicles can be performed more favorably.

[Automotive wire harness fixing adhesive sheet]
The pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet used for fixing an automobile wire harness to a molded part for automobile, and is composed of a base material and a pressure-sensitive adhesive layer provided on the base material. Yes.

  This base material has a two-layer structure of a layer made of a soft metal foil and a foamed resin layer. As a method for forming a two-layer structure, for example, a method of bonding a soft metal foil and a foamed resin layer through an adhesive or a primer, a method of laminating the soft metal foil while melting the foamed resin layer by heating, etc. Is mentioned. By adopting such a two-layer structure, the wire harness can be satisfactorily bonded to an automotive molded part having a material such as a raised non-woven fabric or a rough paper system on its surface, and has excellent shape retention and adhesion. The adhesiveness of the agent can be assisted and flame retardancy can be imparted.

Specific examples of the material of the soft metal foil include aluminum, lead, magnesium, copper, and silver. Among these, aluminum is preferable.
The thickness of the soft metal foil is preferably 2 to 30 μm, more preferably 5 to 20 μm. By setting the thickness of the soft metal foil to 2 to 30 μm, the layer of the soft metal foil is not destroyed when the adhesive sheet is produced, transported, or when the automobile wire harness is applied, and it follows the wire harness. It can be made easy to stick an adhesive sheet. Further, when the thickness of the soft metal foil is in the above range, for example, an adhesive layer is provided on a base material having a two-layer structure of a soft metal foil and a foamed resin layer, and a release paper is bonded onto the adhesive layer. Even when the pressure-sensitive adhesive sheet is produced, the soft metal foil and the release paper are not easily broken and are excellent in rollability.

  In the pressure-sensitive adhesive sheet of the present invention, a groove is provided on the surface of the soft metal foil. This groove is preferably formed of at least one selected from the group consisting of a straight line, a broken line, a one-dot chain line, a two-dot chain line, and a wavy line. As such a thing, what is specifically shown to Fig.1 (a)-(e) can be mentioned, for example. Alternatively, it may be a staggered pattern as shown in FIG. 1 (f), or may be a combination of grooves having different patterns as shown in FIG. 1 (g). Furthermore, as shown in FIG. 1 (h), grooves having the same or different patterns may be combined in a lattice pattern. That is, as long as the grooves are aligned in the longitudinal direction, various patterns of grooves can be used in combination at random.

  About such a groove | channel, the surface area of a soft metal foil needs to be larger than the surface area of the roll contact surface of an adhesive sheet. The roll contact surface of the pressure-sensitive adhesive sheet is a surface where the release layer provided on the pressure-sensitive adhesive layer is in contact with the roll provided in the pressure-sensitive adhesive sheet manufacturing apparatus, and the surface where the release layer is in contact with the pressure-sensitive adhesive layer. It is the opposite side. The release layer can be made of various materials, but when the surface that contacts the roll is fibrous or porous, the surface of the release layer that contacts the roll is Assume a smooth surface. Specifically, the surface area of the soft metal foil is preferably 100.5 to 150.0% of the surface area of the release layer, and more preferably 101.0 to 130.0%. Since the surface area of the soft metal foil is within this range with respect to the surface area of the roll contact surface of the pressure-sensitive adhesive sheet, for example, even when the soft metal foil is in a convex state by passing a roll during production, stress is applied to the groove. Since it can absorb, cracking of the soft metal foil can be prevented, manufacturing trouble can be reduced, and at the same time, an adhesive sheet can be produced with stable quality. Moreover, by fixing a wire harness to a molded part for automobiles with such an adhesive sheet, it has excellent shape retention and high resilience resistance.

  The width of the groove is preferably 0.1 to 5.0 mm, the interval between the grooves is preferably 0.5 to 5.0 mm, and the depth of the groove is 0.01 to 1. 0.0 mm is preferred. However, the interval mentioned here refers to the distance between the ridges of adjacent grooves. For example, when different types of grooves such as straight lines and wavy lines are used in combination, the ridges of these adjacent different grooves The shortest distance between them.

  The release layer is not particularly limited as long as it is subjected to a release treatment, and a known layer can be used. For example, a paper appropriately selected from polyethylene laminated paper, glassine paper, clay coated paper, polyester film, polypropylene film and the like and formed with a release layer of a silicone compound can be suitably used.

  Examples of the foamed resin layer include polyolefin resins such as polyethylene and polypropylene, plastics such as polyurethane resin, polystyrene resin, acrylic resin, vinyl chloride resin, and polycarbonate resin, isoprene, butadiene, chloroprene, and EPDM (ethylene-propylene-diene). Monomers), olefin-based, urethane-based, styrene-based thermoplastic elastomers, and their blends, etc., foamed using chemical foaming, mechanical foaming, etc. into a sheet Is mentioned. In order to improve the cohesive strength of the foamed resin layer, it is preferable to perform cross-linking such as chemical cross-linking or electron beam cross-linking. Among these, polyethylene foam is preferable from the viewpoint of balance between flexibility and strength and cost.

  Moreover, the flame retardance as an adhesive sheet improves more by providing a flame retardance to a foamed resin layer. As a method of imparting flame retardancy to the foamed resin layer, a method using a flame retardant material such as vinyl chloride as the foamed plastic or foamed rubber layer, or adding a flame retardant or flame retardant aid in the foamed resin layer And the like. Known flame retardants and flame retardant aids can be used.

  The thickness of the foamed resin layer is preferably 0.4 to 4.0 mm, and more preferably 1.2 to 3.0 mm. By setting the thickness of the foamed resin layer to 0.4 to 4.0 mm, the wire harness can be satisfactorily bonded to molded parts for automobiles having materials such as a raised nonwoven fabric and a paper system with a rough surface, and The adhesive sheet can be easily pasted by following the wire harness. In addition, when the thickness of the foamed resin layer is within this range, for example, an adhesive sheet in which an adhesive layer is provided on a soft metal foil and a two-layer structure base material of the foamed resin layer, and a release paper is bonded onto the adhesive layer. Even when manufactured, the soft metal foil and release paper are not easily broken, and are excellent in rollability.

  The 25% compressive strength of the foamed resin layer is preferably 10 to 150 MPa, and more preferably 20 to 80 MPa. By setting the 25% compressive strength of the foamed resin layer to 10 to 150 MPa, the wire harness can be satisfactorily bonded to a molded part for automobiles having a material such as a raised nonwoven fabric or a paper system with a rough surface, and a wire The adhesive sheet can be easily pasted by following the harness. In addition, when the adhesive sheet is pasted in the wrong position, the adhesive sheet may be peeled off and pasted again, but if the 25% compressive strength of the foamed resin layer is within the above range, foaming may occur. The resin layer does not break or tear between layers, and can be easily reattached. Furthermore, the foamed resin layer does not become hard and does not impair the adhesion to molded parts for automobiles having materials such as a raised nonwoven fabric or a paper system with a rough surface.

Various adhesives such as known acrylic, rubber, and silicone can be used for the adhesive layer provided on the base material, but automobiles having materials such as brushed nonwoven fabric and paper having a rough surface are used. In order to give sufficient initial adhesive strength to a molded part for use, a synthetic rubber-based pressure-sensitive adhesive is more preferable.
Among them, the pressure-sensitive adhesive layer contains a styrene-isoprene block copolymer and a tackifying resin, and the styrene-isoprene block copolymer has a cyblock amount of 30 to 80% by mass, and the tackifying resin is C _5. system petroleum resin, C ₅ based / C ₉ petroleum resins, and is preferably a pressure-sensitive adhesive layer containing at least one selected from the group consisting of alicyclic petroleum resin.

  The styrene-isoprene block copolymer contained in the pressure-sensitive adhesive layer has a diblock amount of 30 to 80% by mass, thereby obtaining a pressure-sensitive adhesive sheet having excellent adhesion to molded parts for automobiles and excellent retention. It is done. The molecular weight of the styrene-isoprene block copolymer is preferably in the range of 10,000 to 800,000, and more preferably in the range of 30,000 to 500,000. By setting the molecular weight range to 10,000 to 800,000, the cohesive force of the pressure-sensitive adhesive can be improved, and the pressure-sensitive adhesive sheet can be favorably bonded to a molded part for automobiles.

Further, tackifier resin preferably contains at least one selected C ₅ petroleum resins, C ₅ based / C ₉ petroleum resins, and from the group consisting of alicyclic petroleum resin. Since these tackifying resins are compatible with the isoprene layer of the styrene-isoprene block copolymer and improve the adhesiveness, the pressure-sensitive adhesive sheet can be satisfactorily adhered to a molded part for automobiles. Although C ₅ petroleum resin is an aliphatic petroleum resin, as such, for example, Escorez 1202,1304,1401 (manufactured by Tonex), Wing Tack 95 (manufactured by Goodyear), Quinton K100, R100, F100 (Japan Zeon), Picotac 95, Pico Pale 100 (Rika Hercules) and the like. Furthermore, C ₅ based / C ₉ petroleum resin is obtained by copolymerizing the C ₉ petroleum resin is a C ₅ system and an aromatic, as such, for example, Escorez 2101 (manufactured by Tonex) , Quinton S195 (manufactured by Nippon Zeon), Hercotac 1149 (manufactured by Rika Hercules), and the like. The alicyclic petroleum resin can be obtained by hydrogenating a C ₉ (aromatic) petroleum resin. Examples of such an alicyclic petroleum resin include Escollets 5300 (manufactured by Tonex), Alcon P-100 (Arakawa Chemical). And Rigalite R101 (manufactured by Rika Hercules).

C ₅ petroleum resins, as C ₅ based / C ₉ petroleum resins, and alicyclic tackifier resin other than petroleum resin, may be used known tackifying resins. Examples of such known tackifying resins, for example, C ₉ petroleum resins, terpene resins, rosin resin, terpene - phenolic resins, styrene resins, coumarone - indene resins, xylene resins, and phenol resins. Among them, it is preferable to use a polymerized rosin ester resin or a terpene resin.

  It is preferable that content of tackifying resin is 60-200 mass parts with respect to 100 mass parts of styrene-isoprene block copolymers. By setting the content of the tackifying resin to 60 to 200 parts by mass, it is possible to improve adhesion to molded parts for automobiles and adhesion after moisture resistance deterioration, and obtain sufficient heat-resistant holding power. it can.

  Further, a tackifying resin that is liquid at room temperature can also be used as the tackifying resin. Such a tackifying resin that is liquid at room temperature is preferably selected from the known tackifying resins. The content of the liquid tackifying resin is preferably 10 to 30% by mass with respect to the total amount of the tackifying resin. By setting the content of the liquid tackifying resin to 10 to 30% by mass, the wettability to molded parts for automobiles can be improved and good adhesion can be obtained, and sufficient heat-resistant holding power can be obtained. .

  Moreover, what contains a softening agent is preferable as tackifying resin. Examples of such softeners include low molecular weight liquid rubbers such as process oils, polyester plasticizers, and polybutenes. The content of the softening agent is preferably 10 to 30% by mass with respect to the total amount of the tackifying resin. By setting the content of the softening agent to 10 to 30% by mass, it is possible to improve wettability to a molded part for automobiles and to adhere well, and to obtain a sufficient heat resistance holding force.

  In the pressure-sensitive adhesive sheet of the present invention, other polymer components and crosslinking agents can be used. Further, various additives generally used for pressure-sensitive adhesives, such as antioxidants, ultraviolet absorbers, fillers, pigments, thickeners, and the like, can be used as long as adhesiveness is not lowered.

  The pressure-sensitive adhesive thus prepared is usually diluted with an organic solvent such as toluene or hexane and used in the form of a solution. A pressure-sensitive adhesive layer coating solution prepared by dissolving this pressure-sensitive adhesive in an organic solvent is applied to a substrate to form a pressure-sensitive adhesive layer.

  As a method for forming this pressure-sensitive adhesive layer, a method in which the pressure-sensitive adhesive layer coating solution is directly applied and dried on a substrate with a roll coater or a die coater and bonded to the release-treated surface may be used. Alternatively, a method may be used in which a pressure-sensitive adhesive layer is once formed by coating and drying on the treatment surface, and then this is bonded to the substrate surface and transferred to the substrate side.

  The pressure-sensitive adhesive layer is provided on the foamed resin layer of the two-layer structure substrate. By providing the pressure-sensitive adhesive layer on the foamed resin layer, the wire harness can be satisfactorily bonded to an automotive molded part having a material such as a raised nonwoven fabric or a rough paper-based material on the surface. When a pressure-sensitive adhesive layer is provided on a soft metal foil layer, adhesion to automotive molded parts that have materials such as brushed non-woven fabric and rough paper on the surface is a point bond because the soft metal foil layer is hard. Therefore, there is a concern that the adhesive sheet may be peeled off.

  The thickness of the pressure-sensitive adhesive layer in the present invention is preferably 40 to 200 μm, and more preferably 50 to 100 μm from the viewpoint of productivity. By setting the thickness of the pressure-sensitive adhesive layer to 40 to 200 μm, the adhesiveness can be increased and the coating treatment can be performed in a short time.

When the thickness of the pressure-sensitive adhesive layer is 40 to 100 μm, it may be a single-layered pressure-sensitive adhesive layer, but when the thickness exceeds 100 μm, it adheres to a fibrous support such as a nonwoven fabric. It is preferable to use a pressure-sensitive adhesive layer provided in the middle of the adhesive layer. If a single-layer pressure-sensitive adhesive layer having a thickness of more than 100 μm is provided on the substrate, for example, a coating solution for the pressure-sensitive adhesive layer is applied on the temporary support, and the organic solvent is dried. , There is a method of transferring the pressure-sensitive adhesive layer after drying onto the base material from the temporary support, but since the film thickness is thick, there is a problem that organic solvent tends to remain in the pressure-sensitive adhesive layer, and bubbles and the like are likely to be generated. Because.
As a method for producing a pressure-sensitive adhesive layer having a thickness exceeding 100 μm by providing a fibrous support such as a nonwoven fabric in the middle of the pressure-sensitive adhesive layer, for example, in order to impregnate the pressure-sensitive adhesive to the inside of the nonwoven fabric, The coating solution for the agent layer is directly applied to the nonwoven fabric, and the organic solvent is dried to form an adhesive layer having a thickness of about 100 μm including the nonwoven fabric layer impregnated with the adhesive to the inside. Thereafter, the pressure-sensitive adhesive layer of about 100 μm formed on another temporary support is transferred from the temporary support to the surface opposite to the pressure-sensitive adhesive layer provided on one side of the nonwoven fabric, and has a total film thickness of 200 μm. An adhesive layer is formed. Furthermore, there is a method for producing a pressure-sensitive adhesive sheet by transferring the pressure-sensitive adhesive layer having a thickness of 200 μm onto a substrate.

  Alternatively, after drying the coating solution for the pressure-sensitive adhesive layer coated on the release paper, the step of bonding to the nonwoven fabric is performed twice, and the pressure-sensitive adhesive layer is provided on both sides of the nonwoven fabric. A method of pasting may be used.

In the case of a pressure-sensitive adhesive layer having a thickness of 200 μm provided with a fibrous support such as a nonwoven fabric in the middle part of the pressure-sensitive adhesive layer, the thickness of the single-layer thick pressure-sensitive adhesive layer (200 μm) is 2 Since the adhesive layer (100 μm) having a thin layer structure is dried, the organic solvent does not remain in the adhesive layer and the generation of bubbles and the like is small. Can be formed.
Cotton, hemp, rayon, or the like can be used as such a fibrous support such as a nonwoven fabric. The thickness of this support is preferably 20 to 80 μm. In addition, since fibrous supports, such as a nonwoven fabric, have small elasticity, they do not impair the followability and adhesion to molded parts for automobiles and the resilience resistance of the pressure-sensitive adhesive sheet.

  In the present invention, known and publicly available release papers can be used. For example, polyethylene is laminated on any of high-quality paper, kraft paper, and glassine paper, and release treatment is performed on it, or on a synthetic resin film such as polyethylene, polypropylene, or polyethylene terephthalate (PET). The thing etc. which performed the mold process are mentioned. Among these, from the viewpoint of productivity and pasting workability, one obtained by laminating polyethylene on any of high-quality paper, kraft paper, and glassine paper and performing a mold release treatment thereon is preferable.

  In addition, the form of the adhesive sheet of this invention is not specifically limited, A sheet | seat, a roll-shaped product form may be sufficient, and a tape form may be sufficient.

[Molded parts for automobiles]
The molded component for automobiles of the present invention is formed by fixing an automotive wire harness using the above-described adhesive sheet for fixing an automotive wire harness. Examples of such molded parts for automobiles include molded parts in which a mechanism that requires power supply such as a molded ceiling (roof lining), a bumper, a door trim, an instrument panel, and a tailgate lining is installed.

  In FIG. 2, the schematic which fixed the wire harness 3 to the back side surface of the molding ceiling 2 using the adhesive sheet 1 for wire harness fixation for motor vehicles of this invention is shown. (A) is an overall schematic diagram of the molded ceiling 2, (b) is an enlarged schematic diagram in which the wire harness 3 is fixed to the back side of the molded ceiling 2 using the adhesive sheet 1, and (c) is an enlarged schematic diagram of the adhesive sheet 1. FIG. Reference numeral 4 denotes a linear groove provided on the surface of the soft metal foil of the pressure-sensitive adhesive sheet 1.

  The wire harness 3 is wound along the shape of the back side surface of the molded ceiling 2, and the wire harness fixing adhesive sheet 1 for automobile of the present invention is pasted and fixed at an appropriate interval from above the wire harness 3. It is preferable that the pressure-sensitive adhesive sheet 1 is stuck along the shape of the wire harness 3 so that not much air remains from above the wire harness 3. The back side of the molded ceiling 2 is generally a material that is difficult to adhere, and is made of a non-woven fabric or olefin sealing resin with a raised surface, or a paper-based material with a rough surface. The pressure-sensitive adhesive sheet 1 for fixing an automobile wire harness according to the present invention uses the specific material as described above as a base material, and therefore can adhere well to such an adherend. Moreover, since the wire harness 3 may be fixed in a state where a plurality of electric wires are bundled, in this case, a repulsive force that peels off from the back side surface of the molded ceiling 2 and becomes linear acts more strongly on the adhesive sheet 1. . In addition, after fixing the wire harness 3 to the molded ceiling 2 using the adhesive sheet 1, when transporting an assembly assembled as a module, vibration, impact, etc. during transportation are applied to the adhesive sheet 1. Furthermore, when this module is stood and transported, the end portion of the wire harness hangs down, and the weight of the wire harness 3 is added to the adhesive sheet 1 as a load. The pressure-sensitive adhesive sheet 1 for fixing an automobile wire harness according to the present invention uses the specific material as described above as a base material, so that the repulsive force, vibration during transportation, impact, and the weight of the wire harness 3 during transportation. The wire harness 3 can be stably held and fixed following the uneven shape of the molded ceiling 2.

  Further, by using the adhesive sheet 1 to fix the wire harness 3 to the molded ceiling 2 so as to be parallel to the groove provided in the adhesive sheet 1, the followability of the adhesive sheet 1 to the wire harness 3 is further improved. Since it can raise, fixing to the molding ceiling 2 of the wire harness 3 can be performed more favorably.

  Therefore, in the automobile molding component of the present invention, the wire harness is not peeled off before the assembly process by fixing the automobile wire harness using the pressure-sensitive adhesive sheet of the present invention.

  In addition, the molded ceiling 2 and the wire harness 3 are generally manufactured using a flame retardant material for the purpose of preventing fire or preventing the spread of fire during ignition as a safety measure for passengers. Therefore, by fixing the wire harness 3 using the wire harness fixing pressure-sensitive adhesive sheet 1 of the present invention, all the automotive molding parts of the present invention are flame retardant and can prevent or fire. But it can prevent the spread of fire.

[Method for producing pressure-sensitive adhesive sheet for fixing automobile wire harness]
In the manufacturing process, the pressure-sensitive adhesive sheet for fixing a wire harness for automobiles of the present invention is applied to the surface of the soft metal foil on the surface of the pressure-sensitive adhesive sheet before applying the pressure-sensitive adhesive layer coating solution and bonding it to the substrate. In this way, a groove is provided in a vertical direction.
As a method of providing a groove on the surface of the soft metal foil, for example, a convex portion matching the shape of the groove is provided on the roll surface, and a base material having a two-layer structure composed of a soft metal foil layer and a foamed resin layer is used. What is necessary is just to send to this roll and laminate so that the surface of foil may be pressurized by the roll surface which provided the convex part. Since the foamed resin layer has an appropriate shock absorption, a groove can be easily provided on the surface of the soft metal foil by this method. Moreover, it is preferable to provide the convex part of the roll surface so that the longitudinal direction is perpendicular to the traveling direction of the substrate.
Furthermore, the step of providing the groove on the surface of the soft metal foil by the above method needs to be performed before the adhesive layer coating solution is applied and bonded to the substrate.

  By manufacturing in this way, a pressure-sensitive adhesive sheet in which a coating solution for a pressure-sensitive adhesive layer is applied to a base material layer having a two-layer structure in which a soft metal foil and a foamed resin layer are laminated can be passed through a roll. Since the stress generated in the soft metal foil at the time of paper and winding can be absorbed by this groove, cracking of the soft metal foil can be prevented, manufacturing trouble can be reduced, and an adhesive sheet can be manufactured with stable quality.

[Method for fixing automotive wire harness]
The automobile wire harness is fixed to the automobile molded part using the automobile wire harness fixing adhesive sheet of the present invention so as to be parallel to the groove provided in the adhesive sheet.
By fixing in this way, since the followability with respect to the wire harness of an adhesive sheet can be improved more, the fixation to the molded component for motor vehicles of a wire harness can be performed more favorably.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples. The groove patterns (a) to (h) provided on the surface of the soft aluminum foil shown below are the same as the groove patterns (a) to (h) shown in FIG.

[Example 1]
(Preparation of base material)
A roll in which a soft aluminum foil with a thickness of 12 μm and a flame-retardant type polyethylene foam with a thickness of 2.0 mm (Softlon FR3002 manufactured by Sekisui Chemical Co., Ltd.) are bonded together with an adhesive, and then a convex portion that matches the shape of the groove is provided on the surface. By laminating the pasted base material using the above, a base material having a pattern (a) (straight) groove provided on the surface of the soft aluminum foil was obtained.

(Preparation of adhesive layer coating solution)
Styrene - isoprene block copolymer (weight average molecular weight 170,000, styrene content 16 wt%, diblock content 52 wt%) 100 parts by weight, _{C 5} petroleum resins (number average molecular weight 110, softening point 96 ° C.) 40 parts by weight, the polymerization 40 parts by mass of rosin ester resin (number average molecular weight 1200, softening point 125 ° C.), 20 parts by mass of low molecular weight polybutene and 2 parts by mass of hindered phenol are mixed and dissolved in toluene (adhesive layer coating solution) A solution of agent A) was prepared.

(Preparation of adhesive sheet for fixing)
The pressure-sensitive adhesive layer coating solution was applied onto release paper with an applicator so that the thickness after drying was 60 μm, and dried at 80 ° C. for 3 minutes. This was bonded to the surface of the foamed resin layer of the substrate and laminated by pressing to 0.2 MPa to produce an adhesive sheet.

[Example 2]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of a pattern (b) (broken line shape) was provided on the soft aluminum foil of the base material.

[Example 3]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of pattern (c) (dashed line) was provided on the soft aluminum foil of the base material.

[Example 4]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of pattern (d) (wavy line shape) was provided on the soft aluminum foil of the base material.

[Example 5]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of pattern (e) (wavy line shape) was provided on the soft aluminum foil of the base material.

[Example 6]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of pattern (f) (staggered) was provided on the soft aluminum foil of the base material.

[Example 7]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of pattern (g) (composite wire) was provided on the soft aluminum foil of the base material.

[Example 8]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a groove of a pattern (h) (lattice shape) was provided on the soft aluminum foil of the base material.

[Comparative Example 1]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the groove was not provided in the soft aluminum foil of the base material.

Using the pressure-sensitive adhesive sheet prepared above, a test was performed by the following evaluation method. The results are shown in Table 1.
(Evaluation test method)
(1) Rollability of pressure-sensitive adhesive sheet The rolled-up state when the pressure-sensitive adhesive sheet prepared above was wound around a paper tube having an outer diameter of about 4 inches was visually evaluated. In other words, when the wound soft metal foil layer and release paper are not broken or broken, and there is no gap between the substrate surface and the back side of the release paper, “○” is displayed. . In addition, although the soft metal foil or release paper is somewhat folded, it is displayed as “△” when there is almost no gap between the substrate surface and the release paper back surface, and the soft metal foil layer of the wound product or When the release paper is broken or broken, or when there is a large gap between the substrate surface and the back side of the release paper and it is not wound up well, “X” is displayed.

(2) Rebound resistance-1
The adhesive sheet produced above was cut into a size of 100 mm × 50 mm. In an atmosphere of 23 ° C. and 50% relative humidity (hereinafter abbreviated as RH), a wire bundling corrugated tube (manufactured by Denka Electron) having a length of 70 mm and a diameter of 8 mmφ is provided with a groove provided on the soft aluminum foil of the adhesive sheet It arrange | positioned in the position used as the center of an adhesive sheet so that it might become parallel, and as shown in FIG. 3, the corrugated tube was stuck on the roof lining with the adhesive sheet. FIG. 3 is a schematic view in which the corrugated tube 5 is fixed on the roof lining 2 with the adhesive sheet 1. For roofing 2, roofing A (TS Tech, fixing adhesive sheet affixing surface: polypropylene (PP) spunbond nonwoven fabric) and roofing B (MTEC, adhesive sheet affixing surface: paper material) used.
The surface of the pressure-sensitive adhesive sheet 1 in contact with the roof lining 2 was reciprocated once by a 2 kg roller. Immediately after pressurization, the pressure-sensitive adhesive sheet 1 is placed so as to face downward. As shown in FIG. 4, a load 6 of 200 g is hung on one end of the corrugated tube 5, and the pressure-sensitive adhesive sheet peels after 72 hours (resilience resistance). -1) was evaluated. The evaluation criteria are as follows. “◎”: no peeling, “◯”: peeling 1/2 or less, “Δ”: peeling over 1/2, “×”: peeling.
FIG. 4 is a schematic diagram of the repulsion resistance-1 test of the pressure-sensitive adhesive sheet for fixing the automobile wire harness according to the present invention.

(3) Rebound resistance-2
The adhesive sheet produced above was cut into a size of 100 mm × 50 mm. In an atmosphere of 23 ° C. and 50% RH, a wire bundling corrugated tube (manufactured by Denka Electron) having a length of 70 mm and a diameter of 8 mmφ is arranged at the center of the adhesive sheet by the following two affixing methods. As shown, a corrugated tube was affixed to the roofing with an adhesive sheet. That is, the case where the corrugated tube is attached so as to be parallel to the groove provided on the soft aluminum foil of the pressure-sensitive adhesive sheet is referred to as attaching method 1), and the case where the corrugated tube is attached so as to be perpendicular to the groove is applied. Method 2), and evaluation was performed by these two sticking methods. FIG. 3 is a schematic view in which the corrugated tube 5 is fixed on the roof lining 2 with the adhesive sheet 1. For roofing 2, roofing A (TS Tech, fixing adhesive sheet affixing surface: polypropylene (PP) spunbond nonwoven fabric) and roofing B (MTEC, adhesive sheet affixing surface: paper material) used.
The surface of the pressure-sensitive adhesive sheet 1 in contact with the roof lining 2 was reciprocated once by a 2 kg roller. Immediately after pressurization, the pressure-sensitive adhesive sheet 1 is placed sideways, and a load 6 of 200 g is hung on the upper end of the corrugated tube 5 as shown in FIG. -2) was evaluated. The evaluation criteria are as follows. “◎”: no peeling, “◯”: peeling 1/2 or less, “Δ”: peeling over 1/2, “×”: peeling.
FIG. 5 is a schematic view of the repulsion resistance-2 test of the pressure-sensitive adhesive sheet for fixing an automobile wire harness according to the present invention.

(4) Adhesive strength The pressure-sensitive adhesive sheet prepared above was cut into a width of 25 mm and a length of 100 mm, and a stainless steel plate (hairline polishing treatment with # 360 water-resistant abrasive paper) and a polypropylene plate (Nippon Test) at 23 ° C. and 50% RH atmosphere. Panel press) with 1 kg reciprocating pressure with a 2 kg roller, and after 1 hour, it was peeled off at 180 ° with a tensile tester (Orientec RTA100) at a pulling speed of 300 mm / min, and adhesive strength (N / 25 mm) Was measured.

(5) Holding power The pressure-sensitive adhesive sheet prepared above was cut into a width of 25 mm and a length of 100 mm, and applied to a stainless steel plate (hairline polishing treatment with # 360 water-resistant polishing paper) in an atmosphere of 23 ° C. and 50% RH. It stuck by 1 reciprocating pressure with a 2 kg roller so that it might become 25 mm. After 1 hour, a load of 0.5 kg was applied in an atmosphere of 40 ° C., and the time required for dropping was measured. When it did not fall for 24 hours or more, “> 24” was displayed in Table 1.

(6) Flame retardancy (test according to FMVSS No. 302)
The pressure-sensitive adhesive sheet produced above was cut into a width of 70 mm and a length of 200 mm, and attached horizontally to the combustion test jig with the pressure-sensitive adhesive layer surface facing downward. The flame height of the gas burner was set to 40 mm, and the flame retardancy when the tip of the adhesive sheet was ignited for 15 seconds was evaluated. In addition, if you draw a marked line at a position 38mm from the edge of the adhesive sheet and extinguish the fire before reaching the marked line, if you extinguish the fire within 60 seconds after passing the marked line, within 50mm from the edge after passing the marked line In the case of extinguishing the fire at the position, both were indicated as self-extinguishing. In addition, those that did not ignite even after being exposed to a flame for 15 seconds were indicated as flame retardant, and the others were indicated as combustion.

According to the above results, the pressure-sensitive adhesive sheet of Comparative Example 1 is broken in the aluminum foil layer when the pressure-sensitive adhesive sheet is rolled as compared with the pressure-sensitive adhesive sheets of Examples 1 to 8, and the flame retardancy is inferior. In addition to being sufficient, it was found that the rebound resistance is inferior and does not necessarily satisfy all the required performances required for an adhesive sheet for fixing an automobile wire harness.
On the other hand, the pressure-sensitive adhesive sheets of Examples 1 to 8 of the present invention have the required performance required for a wire harness fixing pressure-sensitive adhesive sheet for automobiles in all of rollability, resilience resistance, adhesive strength, holding power and flame retardancy. It was something to satisfy.

  The present invention provides a powerful means for reducing the required man-hours in the automobile assembly process.

It is a figure which shows the example of the groove | channel provided in the soft metal foil surface of the adhesive sheet for automobile wire harness fixation of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which fixed the wire harness to the back surface side of a shaping | molding ceiling using the adhesive sheet for automobile wiring harness fixation of this invention, (a) is the whole schematic view of a shaping | molding ceiling, (b) is expansion of a shaping | molding ceiling. Schematic, (c) is an enlarged schematic view of the surface of the pressure-sensitive adhesive sheet for fixing an automobile wire harness. It is the schematic which fixed the corrugated tube on roof lining using the adhesive sheet for wire harness fixation for motor vehicles of this invention. It is the schematic of the test method of the resilience resistance of the adhesive sheet for fixing the wire harness for motor vehicles in the Example of this invention. It is the schematic of the test method of the resilience resistance of the adhesive sheet for fixing the wire harness for motor vehicles in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Automobile wire harness fixing adhesive sheet, 2 ... Lou-flying, 3 ... Wire harness, 4 ... Groove, 5 ... Corrugated tube, 6 ... Load

Claims (13)

A pressure-sensitive adhesive sheet used for fixing an automobile wire harness to a molded part for an automobile,
The wire harness for automobiles, wherein the pressure-sensitive adhesive sheet has a structure in which a soft metal foil, a foamed resin layer, and a pressure-sensitive adhesive layer are laminated in this order, and a groove is provided on the surface of the soft metal foil. Fixing adhesive sheet.   The automobile wire harness fixing according to claim 1, wherein the groove is formed of at least one selected from the group consisting of a straight line, a broken line, a one-dot chain line, a two-dot chain line, and a wavy line. Adhesive sheet.   The surface area of the soft metal foil in which a release layer is provided on the pressure-sensitive adhesive layer and the grooves are provided is 100.5 to 150.0% with respect to the surface area of the release layer. The adhesive sheet for fixing the automobile wire harness as described.   The pressure-sensitive adhesive sheet for fixing an automotive wire harness according to any one of claims 1 to 3, wherein the thickness of the soft metal foil is 2 to 30 µm.   The pressure-sensitive adhesive sheet for fixing an automotive wire harness according to any one of claims 1 to 4, wherein the foamed resin layer has a thickness of 0.4 to 4.0 mm.   The pressure-sensitive adhesive sheet for fixing an automobile wire harness according to any one of claims 1 to 5, wherein the soft metal foil is a soft aluminum foil.   The pressure-sensitive adhesive sheet for fixing an automotive wire harness according to any one of claims 1 to 6, wherein the foamed resin layer has a 25% compressive strength of 10 to 150 MPa.   The pressure-sensitive adhesive sheet for fixing an automobile wire harness according to any one of claims 1 to 7, wherein the foamed resin layer is a polyethylene foam.   The pressure-sensitive adhesive sheet for fixing an automobile wire harness according to any one of claims 1 to 8, wherein the foamed resin layer contains a flame retardant. The pressure-sensitive adhesive layer contains a styrene-isoprene block copolymer and a tackifying resin,
The styrene-isoprene block copolymer has a cyblock amount of 30 to 80% by mass,
The tackifying resin, containing at least one selected C ₅ petroleum resins, C ₅ based / C ₉ petroleum resins, and from the group consisting of alicyclic petroleum resin,
The pressure-sensitive adhesive sheet for fixing an automobile wire harness according to any one of claims 1 to 9, wherein a content of the tackifying resin is 60 to 200 parts by mass with respect to 100 parts by mass of the styrene-isoprene block copolymer. .   An automotive wire harness is fixed using the automotive wire harness fixing pressure-sensitive adhesive sheet according to claim 1. It is a manufacturing method of the adhesive sheet for wire harness fixation for vehicles according to any one of claims 1 to 10,
In the manufacturing process, before winding up the pressure-sensitive adhesive sheet with a roll, a groove is provided on the surface of the soft metal foil in a direction perpendicular to the traveling direction of the pressure-sensitive adhesive sheet. Manufacturing method of adhesive sheet for fixing. Using the automobile wire harness fixing adhesive sheet according to any one of claims 1 to 10, the automobile wire harness is formed into an automobile molded part so as to be parallel to a groove provided in the adhesive sheet. A method for fixing a wire harness for an automobile characterized by fixing.

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