Adhesive sheet, sealing material, and sealing structure

Abstract

The material of the adhesive sheet (10) has a first dynamic shear storage modulus G '0 higher than 1.0 * 106 Pa and a second dynamic shear storage modulus G' 50 lower than 1.0 * 106 Pa. The first dynamic shear storage modulus G '0 is the dynamic shear storage modulus G' of the material of the adhesive sheet (10) at 1 Hz and 0 DEG C. The second dynamic shear storage modulus G '50 is the dynamic shear storage modulus G' of the material of the adhesive sheet (10) at 1 Hz and 0 DEG C.

Description

Technical Field

[0001] This invention relates to adhesive sheets, seals, and sealing structures. Background Technology

[0002] Previously, seals with adhesive tabs were known.

[0003] For example, Patent Document 1 describes a water-stopping sealant having a layer of a defined adhesive composition on at least one side of a foamed structure having independent air bubbles. This layer comprises a polymer having a defined polycarbonate structure. The water-stopping sealant is non-adhesive and therefore does not adhere immediately. After installation, the water-stopping sealant gradually adheres to the substrate due to the resilience of the foamed structure, thus improving the sealing performance of the interface between the foamed structure surface and the substrate. A water-stopping test was conducted with a sample of the water-stopping sealant held between two acrylic plates.

[0004] On the other hand, adhesive sheets that can be peeled off after being attached to an adhesive surface are known to be conceived. For example, Patent Document 2 describes a pressure-sensitive adhesive tape that can be re-detached without residue or damage by substantially stretching the adhesive surface. This pressure-sensitive adhesive tape includes at least one adhesive layer made of microspheres and at least one carrier B. The pressure-sensitive adhesive A forming the adhesive layer includes an elastomer portion (a1) based on at least one polyethylene aromatic-polydiene-block copolymer and a defined adhesive resin portion (a2). The pressure-sensitive adhesive A optionally includes a softening resin portion (a3).

[0005] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 10-77463 Patent Document 2: Japanese Patent Application Publication No. 2018-138649 Summary of the Invention

[0006] The problem that the invention aims to solve According to patent documents 1 and 2, it was not conceivable to use a seal under conditions requiring both the application of a seal to a rough surface and the high-speed peeling of a seal.

[0007] Therefore, the present invention provides an adhesive sheet that is advantageous from the viewpoint of attaching seals to rough surfaces and peeling seals off at high speeds.

[0008] Solution for solving the problem The present invention provides an adhesive sheet, wherein the first dynamic shear storage modulus (G') of the material of the adhesive sheet at 1 Hz and 0 °C is 1.0 × 10⁻⁶. 6Pa is higher, and the second dynamic shear storage modulus (G') of the material at 1 Hz and 50 °C is 1.0 × 10⁻⁶. 6 Pa is low.

[0009] Furthermore, the present invention provides a sealing element having the aforementioned adhesive sheet and a first layer covered by the adhesive sheet.

[0010] Furthermore, the present invention provides a sealing structure, wherein the sealing structure comprises a first component, a second component, and the aforementioned sealing member, the sealing member sealing the space between the first component and the second component.

[0011] Invention Effects The aforementioned adhesive sheet is advantageous from the viewpoint of attaching seals to rough surfaces and peeling seals off at high speeds. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view schematically illustrating an example of an adhesive sheet of the present invention.

[0013] Figure 2 It is a graph showing the relationship between the dynamic shear storage modulus (G') of the adhesive sheet material and temperature.

[0014] Figure 3 This is a cross-sectional view schematically illustrating an example of the seal of the present invention.

[0015] Figure 4 This is a cross-sectional view schematically illustrating another example of the seal of the present invention.

[0016] Figure 5 This is a cross-sectional view schematically illustrating an example of the sealing structure of the present invention. Detailed Implementation

[0017] Embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following embodiments.

[0018] Figure 1 This is a cross-sectional view schematically illustrating an example of an adhesive sheet of the present invention. Figure 1 The adhesive sheet 10 shown is made of a specified material. Figure 2 The relationship between the dynamic shear storage modulus (G') of the material of adhesive sheet 10 and temperature is shown. The material of adhesive sheet 10 is as follows: Figure 2 As shown in graph (a), it has a higher value than 1.0 × 10 6 The first dynamic shear storage modulus G'0 with a Pa value of 1.0 × 10⁻⁶ is high. 6 [Pa] Low second dynamic shear storage modulus G' 50The first dynamic shear storage modulus G'0 is the dynamic shear storage modulus (G') of the adhesive sheet 10 at 1 Hz and 0 °C. The second dynamic shear storage modulus G' 50 G' is the dynamic shear storage modulus of the material of the adhesive sheet 10 at 1 Hz and 0 °C.

[0019] When sealing components with rough surfaces using seals incorporating adhesive tabs, it is crucial that the seal adheres firmly and tightly to the rough surface. Furthermore, considering environmental factors, the recycling of components with rough surfaces is considered important. In this case, for example, it is envisioned that the seal adhering to the component with the rough surface be peeled off, allowing for the recycling of the component. To improve the efficiency of recycling components with rough surfaces, it is important to prevent seal breakage and residual adhesive tabs on the rough surface, even when peeling the seal off at high speed.

[0020] For example, such as Figure 2 As shown in graph (b), if the adhesive strength of the bonding sheet is increased and the bonding sheet is made softer by considering attaching the seal to the rough surface, the bonding sheet is prone to breakage and it is difficult to peel off the seal at high speed. On the other hand, for example, as Figure 2 As shown in (c), if the toughness of the adhesive sheet is increased and the adhesive sheet is made harder to peel off the seal at high speed, the adhesiveness of the adhesive sheet decreases, making it difficult to attach the seal to a rough surface. Therefore, the inventors have repeatedly conducted in-depth research on adhesive sheets that are advantageous from the perspectives of attaching the seal to a rough surface and peeling off the seal at high speed.

[0021] It can be considered that the behavior of the material of the seal and adhesive sheet attached to the rough surface is highly correlated at low speeds, and if the temperature-time conversion rule of viscoelastic behavior is considered, it is highly correlated with the behavior of the material at high temperatures. On the other hand, it can be considered that the behavior of the material of the seal and adhesive sheet peeled off at high speeds is highly correlated at high speeds, and if the temperature-time conversion rule of viscoelastic behavior is considered, it is highly correlated with the behavior of the material at low temperatures. Based on such investigations, the inventors conducted a large number of trials and errors. As a result, they newly discovered that by adjusting the first dynamic shear storage modulus G'0 and the second dynamic shear storage modulus G' of the material contained in the adhesive sheet 10... 50 Meeting the above conditions enables the adhesive sheet 10 to exhibit advantageous characteristics from the perspectives of both attaching seals to rough surfaces and peeling seals off at high speeds.

[0022] The dynamic shear storage modulus of the material of the adhesive sheet 10 can be determined, for example, by the method described in the embodiments. A sample for determining the dynamic shear storage modulus of the material of the adhesive sheet 10 used in the seal described later can be prepared, for example, by cutting a portion of the adhesive sheet 10 from the seal; or by drying the solution obtained by dissolving the adhesive sheet 10 in a solvent and shaping it into a specified shape; etc.

[0023] The first dynamic shear storage modulus G'0 only needs to be greater than 1.0 × 10 6 A higher Pa value does not limit it to a specific value. For example, the first dynamic shear storage modulus G'0 is greater than 1.0 × 10⁻⁶. 6 Pa is high and is 5.0 × 10 7 Below Pa. The first dynamic shear storage modulus G'0 can be 1.2 × 10⁻⁶. 6 Pa or above, 1.5 × 10 6 Pa or above, 2.0 × 10 6 Pa or above, 2.5 × 10 6 Pa or above, 3.0 × 10 6 Pa or above, 5.0 × 10 6 Pa or above or 1.0 × 10 7 Pa or higher. The first dynamic shear storage modulus G'0 can be 4.5 × 10⁻⁶. 7 Below Pa, 4.0 × 10 7 Below Pa, 3.5 × 10 7 Below Pa, 3.0×10 7 Below Pa, 2.5×10 7 Pa or below or 2.0 × 10 7 Below Pa.

[0024] Second dynamic shear storage modulus G' 50 As long as it is more than 1.0×10 6 Since Pa is low, it is not limited to a specific value. Second dynamic shear storage modulus G' 50 For example, 1.0 × 10 5 Pa or higher and greater than 1.0 × 10 6 Pa is low. The second dynamic shear storage modulus G' 50 It can be 1.2 × 10 5 Pa or above, 1.5 × 10 5 Pa or above, 2.0 × 10 5 Pa or above or 2.5 × 10 5 Pa or above. Second dynamic shear storage modulus G' 50 It can be 9.8×10 5 Below Pa, 9.5 × 10 5 Below Pa, 9.0×10 5Pa or below or 8.5×10 5 Below Pa.

[0025] In the adhesive sheet 10, the first dynamic shear storage modulus G'0 is relative to the second dynamic shear storage modulus G' 50 The ratio G'0 / G' 50 Not limited to a specific value. Compared to G'0 / G' 50 For example, a value of 4.0 or higher. In this case, the adhesive sheet 10 more easily exhibits its advantageous characteristics from the perspectives of both attaching seals to rough surfaces and high-speed peeling of seals.

[0026] Comparison of G'0 / G' 50 Ideally, it should be 4.5 or higher, and even better, 5 or higher. (Compared to G'0 / G') 50 For example, below 150, below 140, below 120, below 100, below 90, below 80, below 70, below 60, or below 55.

[0027] The material of adhesive sheet 10 only needs to have a ratio of 1.0 × 10 6 The first dynamic shear storage modulus G'0 with a Pa value of 1.0 × 10⁻⁶ is high. 6 [Pa] Low second dynamic shear storage modulus G' 50 It is not limited to a specific material. The adhesive sheet 10 may contain, for example, a rubber-based polymer. The rubber-based polymer may be, for example, a synthetic rubber such as a thermoplastic elastomer or a thermosetting elastomer.

[0028] Examples of thermoplastic elastomers include olefin-based elastomers, styrene-based elastomers, butyl-based elastomers, and vinyl chloride-based elastomers. Examples of olefin-based elastomers include ethylene-propylene rubber (EPM) and ethylene-propylene-diene rubber (EPDM). Examples of styrene-based elastomers include styrene-butadiene rubber (SBR), styrene-butadiene-styrene rubber (SBS), styrene-isoprene-styrene rubber (SIS), styrene-ethylene-butadiene rubber, styrene-ethylene-butene-styrene rubber (SEBS), styrene-isobutylene-styrene block rubber (SIBS), and styrene-isoprene-propylene-styrene rubber. Examples of butyl-based elastomers include butyl rubber, polyisobutylene rubber, polybutene, polyisoprene rubber, and nitrile rubber (NBR). Examples of vinyl chloride-based elastomers include chloroprene rubber or chlorosulfonated polyethylene rubber.

[0029] Examples of thermosetting elastomers include silicone rubber, fluororubber, acrylic rubber, and polyamide rubber.

[0030] The rubber-based polymer is ideally a thermoplastic elastomer, and more ideally a styrene-based elastomer. When the rubber-based polymer is a styrene-based elastomer, it ideally contains 15% to 35% styrene units by weight. In this case, the adhesive sheet 10 more easily exhibits properties advantageous from the perspectives of both sealing against rough surfaces and high-speed peeling of seals.

[0031] The weight-average molecular weight of the rubber-based polymer is, for example, 30,000 or more, ideally 50,000 or more, and more ideally 100,000 or more. The weight-average molecular weight of the rubber-based polymer is, for example, 5 million or less, ideally 3 million or less, and more ideally 1 million or less. In this case, the surface formed by the adhesive sheet 10 readily possesses the desired adhesive strength. The weight-average molecular weight is determined using gel permeation chromatography, converted to polystyrene.

[0032] The adhesive sheet 10 may be made of an elastomer and a tackifier. The elastomer may be, for example, the rubber-based polymer described above.

[0033] Tackifiers are not limited to specific substances. Tackifiers can be, for example, defined resins. Examples of such resins include rosin-based tackifiers, terpene-based tackifiers, hydrocarbon-based tackifiers, phenolic tackifiers, ketone-based tackifiers, polyamide-based tackifiers, epoxy-based tackifiers, and elastic tackifiers. Examples of rosin-based tackifiers include unmodified rosin, modified rosin, rosin phenolic resins, and rosin ester resins. Examples of terpene-based tackifiers include terpene resins, terpene phenolic resins, styrene-modified terpene resins, aromatic-modified terpene resins, and hydrogenated terpene resins. Examples of hydrocarbon-based tackifiers include aliphatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic / aromatic petroleum resins, aliphatic / alicyclic petroleum resins, hydrogenated hydrocarbon resins, coumarone-based resins, and coumarone-indene-based resins. Examples of aromatic hydrocarbon resins include styrene-based resins and xylene-based resins. Examples of phenolic tackifying resins include alkylphenol resins, xylene-formaldehyde resins, soluble phenolic resins (Resol), and linear phenolic varnishes (Novolak). Ideally, tackifiers should be alicyclic or aromatic hydrocarbon resins.

[0034] The content of the tackifier in the adhesive sheet 10 is not limited to a specific value. For example, in the adhesive sheet, the ratio of the tackifier content to the content of elastomers such as rubber-based polymers is, for example, 0.5 to 1 by mass. As a result, the adhesive sheet 10 can more easily exhibit advantageous properties from the viewpoints of both applying seals to rough surfaces and peeling seals at high speeds.

[0035] The thickness of the adhesive sheet 10 is not limited to a specific value. For example, its thickness can be 50 to 400 μm. The thickness of the adhesive sheet 10 can be 70 μm or more, or 80 μm or more. The thickness of the adhesive sheet 10 can be 300 μm or less, or 250 μm or less.

[0036] A seal with adhesive sheet 10 can be provided. For example... Figure 3 As shown, the seal 1a includes an adhesive sheet 10 and a first layer 20 covered by the adhesive sheet 10. The adhesive sheet 10, for example, covers a portion of the surface of the first layer 20. The material of the adhesive sheet 10, as described above, has a density greater than 1.0 × 10⁻⁶. 6 The first dynamic shear storage modulus G'0 with a Pa value of 1.0 × 10⁻⁶ is high. 6 [Pa] Low second dynamic shear storage modulus G' 50 Therefore, seal 1a is advantageous from the viewpoint of attaching seal 1a to rough surfaces and high-speed peeling seal 1a.

[0037] like Figure 3 As shown, the seal 1a includes, for example, a pair of adhesive sheets 10, with a first layer 20 disposed between the pair of adhesive sheets 10. The pair of adhesive sheets 10 are disposed on both sides of the seal 1a in the thickness direction. Thus, adhesive surfaces 11 formed by the adhesive sheets 10 are formed on both sides of the seal 1a in the thickness direction of the adhesive sheets 10.

[0038] The material forming the first layer 20 is not limited to a specific material. The first layer 20 is, for example, a foam. In this case, even if the gap to be sealed is large, the gap can be easily filled by the sealant 1a. Furthermore, as a foam, the first layer 20 can be compressed and deformed to match the gap, so a sealing structure that performs water-stopping function can be easily obtained using the sealant 1a.

[0039] The structure of the foam is not limited to a specific structure. For example, the foam may have an independent bubble structure. In this case, the internal liquid tightness of the foam is high, and the desired water-stopping effect can be easily achieved through the seal 1a.

[0040] Foamed materials can, for example, have a semi-independent, semi-continuous bubble structure. In this case, the foamed material contains continuous bubbles before compression deformation; for example, when the foamed material is compressed and deformed in a manner that produces more than 50% compression deformation, it changes to a structure identical to that of independent bubbles due to blockage of the continuous portion. Foamed materials can, for example, have a continuous bubble structure.

[0041] The material used to form the foam is not limited to a specific material. For example, the foam can be a rubber foam or a resin foam. Examples of resin foams include polyurethane foam, silicone foam, and acrylic foam.

[0042] Ideally, the foam should be a rubber foam. In this case, even with small compression deformation of the foam in the sealing structure described later, the sealing structure can easily achieve high water-tightness. A rubber foam is obtained, for example, by foaming a rubber composition containing rubber, a foaming agent, and a crosslinking agent.

[0043] Rubber can be, for example, olefin-based elastomers, styrene-based elastomers, butyl-based elastomers, vinyl chloride-based elastomers, or natural rubber. Examples of olefin-based elastomers include ethylene-propylene rubber (EPM) and ethylene-propylene-diene rubber (EPDM). Examples of styrene-based elastomers include styrene-butadiene rubber (SBR), styrene-butadiene-styrene rubber (SBS), styrene-isoprene-styrene rubber (SIS), styrene-ethylene-butadiene rubber, styrene-ethylene-butene-styrene rubber (SEBS), styrene-isobutylene-styrene block rubber (SIBS), and styrene-isoprene-propylene-styrene rubber. Examples of butyl-based elastomers include butyl rubber, polyisobutylene rubber, polybutene, polyisoprene rubber, and nitrile rubber (NBR). Examples of vinyl chloride-based elastomers include chloroprene rubber and chlorosulfonated polyethylene rubber.

[0044] Ideally, the rubber should be an olefin-based elastomer, and even more ideally, EPDM. In this case, the sealing structure can easily achieve high water-tightness even with small compression deformation of the foam in the sealing structure.

[0045] EPDM is a rubber obtained by copolymerizing ethylene, propylene, and dienes. In addition to ethylene and propylene, dienes are also copolymerized, thereby introducing unsaturated bonds, which can be cross-linked using cross-linking agents.

[0046] Examples of dienes include 5-ethylidene-2-norbornene, 1,4-hexadiene, and dicyclopentadiene. These dienes can be used alone or in combination of two or more. When the diene includes dicyclopentadiene, an increase in the degree of crosslinking can be sought.

[0047] Ideally, EPDM should have long-chain branches. The method for introducing long branches into EPDM is not limited to a specific method; well-known methods can be used. If EPDM has long-chain branches, the rubber composition can be well foamed.

[0048] The diene content in EPDM is, for example, 1% by mass or more, ideally 2% by mass or more, and even more ideally 3% by mass or more. The diene content is, for example, less than 20% by mass, ideally less than 15% by mass. Therefore, the rubber foam is less prone to surface shrinkage and cracking.

[0049] The foaming agent can be either an organic or inorganic foaming agent.

[0050] Examples of organic blowing agents include azo-based blowing agents, N-nitroso-based blowing agents, hydrazide-based blowing agents, aminourea-based blowing agents, fluoroalkane-based blowing agents, triazole-based blowing agents, and other well-known organic blowing agents. Examples of azo-based blowing agents include azodicarbonamide (ADCA), barium azodicarboxylate, azobisisobutyronitrile (AIBN), azocyclohexanenitrile, and azodiaminobenzene. Examples of N-nitroso-based blowing agents include N,N'-dinitrospentamethylenetetramine (DTP), N,N'-dimethyl-N,N'-dinitrosoterephthalamide, and trinitrosotrimethyltriamine. Examples of hydrazide-based blowing agents include 4,4'-oxobis(benzenesulfonylhydrazine) (OBSH), p-toluenesulfonylhydrazine, diphenyl sulfone-3,3'-disulfonylhydrazine, 2,4-toluenedisulfonylhydrazine, p,p-bis(benzenesulfonylhydrazine) ether, and benzene-1,3-disulfonylhydrazine and allylbis(sulfonylhydrazine). Examples of aminourea-based blowing agents include p-toluenesulfonamide and 4,4'-oxobis(benzenesulfonamide). Examples of fluoroalkane-based blowing agents include trichlorofluoromethane and dichlorofluoromethane. Examples of triazole-based blowing agents include 5-morpholino-1,2,3,4-thiatriazole. Organic blowing agents can be thermally expandable microparticles formed by encapsulating a heat-expanding substance within microcapsules. Examples of such thermally expandable microparticles include commercially available products such as Microsphere (trade name, manufactured by Matsumoto Oils & Fats Co., Ltd.).

[0051] Examples of inorganic blowing agents include bicarbonates, carbonates, nitrites, borohydrides, inorganic azides, and other well-known inorganic blowing agents. Examples of bicarbonates include sodium bicarbonate and ammonium bicarbonate. Examples of carbonates include sodium carbonate and ammonium carbonate. Examples of nitrites include sodium nitrite and ammonium nitrite. Examples of borohydrides include sodium borohydride. These blowing agents can be used alone or in combination of two or more.

[0052] The amount of foaming agent added relative to 100 parts by weight of rubber is, for example, 0.1 parts by weight or more, ideally 1 part by weight or more, and more ideally 10 parts by weight or more. The amount of foaming agent added is, for example, 50 parts by weight or less, ideally 30 parts by weight or less.

[0053] Examples of crosslinking agents include sulfur compounds such as sulfur (S8) and 4,4'-dithiodimorpholine, selenium, magnesium oxide, lead monoxide, quinone dioxime, dibenzoyl-p-quinone dioxime, poly(p-nitrosobenzene), polyamines, nitroso compounds such as p-nitrosobenzene, organic peroxides, resins, and ammonium salts such as ammonium benzoate. Examples of organic peroxides include dicumyl peroxide, dimethyl di(tert-butyl peroxide)hexane, 1,1-di(tert-butyl peroxide)cyclohexane, and α,α'-di(tert-butyl peroxide)diisopropylbenzene. Examples of resins include alkylphenol-formaldehyde resins and melamine-formaldehyde condensates. These crosslinking agents can be used alone or in combination of two or more.

[0054] Ideal crosslinking agents are sulfur (S8) and sulfur compounds, quinone-type compounds, or organic peroxides. Sulfur (S8) and sulfur compounds are advantageous from the viewpoint of excellent mechanical strength and foaming properties. Quinone-type compounds are advantageous from the viewpoint of reduced sulfur atom content, reduced corrosivity, and excellent foaming properties. Organic peroxides are advantageous from the viewpoint of improved adhesion to the object used to achieve the sealing structure and good conformability to elevation differences.

[0055] The proportion of the crosslinking agent relative to 100 parts by weight of rubber is, for example, 0.05 parts by weight or more, ideally 0.5 parts by weight or more, and more ideally 1 part by weight or more. The proportion of the crosslinking agent relative to 100 parts by weight of rubber is, for example, 30 parts by weight or less, ideally 20 parts by weight or less, and more ideally 10 parts by weight or less.

[0056] As a crosslinking agent, quinone-type compounds and organic peroxides can be used together. In this case, it is easier to achieve sufficient crosslinking at the surface of the foam. When using quinone-type compounds and organic peroxides together, the proportion of the organic peroxide relative to 100 parts by mass of the quinone-type compound is, for example, 1 part by mass or more, more preferably 10 parts by mass or more. The proportion of the organic peroxide relative to 100 parts by mass of the quinone-type compound is, for example, 100 parts by mass or less, ideally 50 parts by mass or less.

[0057] Ideally, the rubber composition contains foaming agents and crosslinking agents. Examples of foaming agents include urea-based foaming agents, salicylic acid-based foaming agents, benzoic acid-based foaming agents, and metal oxides such as zinc oxide. Urea-based foaming agents and metal oxides are preferred. These foaming agents can be used alone or in combination of two or more.

[0058] The proportion of the foaming agent relative to 100 parts by weight of rubber is, for example, 0.5 parts by weight or more, ideally 1 part by weight or more. Its proportion relative to 100 parts by weight of rubber is, for example, 20 parts by weight or less, more ideally 10 parts by weight or less.

[0059] Examples of crosslinking aids include thiazoles, thioureas, dithiocarbamates, guanidines, sulfenamides, thiurams, xanthic acids, aldehydes, and aldehyde amines. Ideally, thiazoles, thioureas, dithiocarbamates, or thiurams should be used as crosslinking aids. Examples of thiazoles include dibenzothiazole disulfide and 2-mercaptobenzothiazole. Examples of thioureas include diethylthiourea, trimethylthiourea, and dibutylthiourea. Examples of dithiocarbamates include sodium dimethyldithiocarbamate, sodium diethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, and zinc dibenzyldithiocarbamate. Examples of guanidines include diphenylguanidine and di-o-tolylguanidine. Examples of sulfenamides include benzothiazole-2-diethylsulfenamide and N-cyclohexyl-2-benzothiazole sulfenamide. Examples of thiurams include tetramethylthiuram monosulfide, tetramethylthiuram disulfide, and tetrabenzylthiuram disulfide. Examples of xanthates include sodium isopropyl xanthate and zinc isopropyl xanthate. Examples of aldehydes and amines include acetaldehyde and hexamethylenetetramine. Examples of aldehydes and amines include n-butyraldehyde aniline and butyraldehyde monobutylamine.

[0060] Crosslinking aids can be alcohols. Examples of alcohols include monohydric alcohols such as ethanol, dihydric alcohols such as ethylene glycol, trihydric alcohols such as glycerol, and polyhydric alcohols (polyoxyethylene glycol) such as polyethylene glycol and polypropylene glycol. Ideally, polyhydric alcohols should be used. In this case, the number average molecular weight of the polyhydric alcohol is, for example, 200 or more, ideally 300 or more. The number average molecular weight of the polyhydric alcohol is, for example, 10,000 or less, ideally 5,000 or less.

[0061] These crosslinking aids can be used alone or in combination with two or more.

[0062] When using sulfur and sulfur compounds as crosslinking agents, from the viewpoint of ensuring good foam shape and softness of the foam, thiazoles, thioureas, dithiocarbamates, or thiurams are ideal as crosslinking aids.

[0063] When using quinone compounds as crosslinking agents, alcohols are ideal, and polyols are even more ideal, from the viewpoint of reducing corrosivity. In particular, when using derivatives of quinone dioxime as quinone compounds, the use of polyethylene glycol is advantageous. Using polyethylene glycol as a polyol allows for good crosslinking of the rubber composition, easily ensuring excellent foaming properties.

[0064] The proportion of the crosslinking aid relative to 100 parts by weight of rubber is, for example, 0.01 parts by weight or more, ideally 0.02 parts by weight or more, and more ideally 0.06 parts by weight or more. Its amount relative to 100 parts by weight of rubber is, for example, 20 parts by weight or less, ideally 10 parts by weight or less, and more ideally 5 parts by weight or less.

[0065] Rubber compositions may contain additives such as lubricants (processing aids), pigments, fillers, flame retardants, and softeners, as needed.

[0066] Examples of lubricants include stearic acid, stearic acid esters, stearic compounds such as zinc stearate, and paraffin wax. These lubricants can be used alone or in combination of two or more. The proportion of the lubricant relative to 100 parts by weight of rubber is, for example, 0.1 parts by weight or more, ideally 1 part by weight or more. Alternatively, the proportion relative to 100 parts by weight of rubber is, for example, 20 parts by weight or less, more ideally 10 parts by weight or less.

[0067] Carbon black is an example of a pigment. Pigments can be used alone or in combination of two or more. The proportion of pigment relative to 100 parts by weight of rubber is, for example, 1 part by weight or more, ideally 2 parts by weight or more. Alternatively, the proportion relative to 100 parts by weight of rubber is, for example, 50 parts by weight or less, ideally 30 parts by weight or less.

[0068] The filler material can be inorganic, organic, or other known filler materials. Examples of inorganic fillers include calcium carbonate, magnesium carbonate, silica and its salts, clay, talc, mica powder, bentonite, silica, alumina, aluminum silicate, and aluminum powder. An example of an organic filler is cork. These fillers can be used alone or in combination of two or more. The proportion of the filler material relative to 100 parts by weight of rubber is, for example, 10 parts by weight or more, ideally 30 parts by weight or more, and more ideally 50 parts by weight or more. Alternatively, the proportion relative to 100 parts by weight of rubber is, for example, 300 parts by weight or less, ideally 200 parts by weight or less.

[0069] Examples of flame retardants include hydroxides such as calcium hydroxide, magnesium hydroxide, and aluminum hydroxide. These flame retardants can be used alone or in combination of two or more. The proportion of the flame retardant relative to 100 parts by weight of rubber is, for example, 5 parts by weight or more, ideally 10 parts by weight or more, and more ideally 15 parts by weight or more. Alternatively, the proportion relative to 100 parts by weight of rubber is, for example, 200 parts by weight or less, ideally 150 parts by weight or less, and more ideally 100 parts by weight or less.

[0070] Examples of plasticizers include petroleum-based oils, asphalt, low molecular weight polymers, organic esters, and tackifiers. Examples of petroleum-based oils include paraffinic processed oils such as paraffin oil, cycloalkanes processed oils, drying oils or animal and vegetable oils, and aromatic processed oils. An example of drying oils or animal and vegetable oils is linseed oil. Examples of organic esters include phthalates such as di-2-ethylhexyl phthalate (DOP) and dibutyl phthalate (DBP), phosphate esters, higher fatty acid esters, and alkyl sulfonates. Ideally, petroleum-based oils or asphalt should be used as plasticizers, and paraffinic processed oils are even more ideal. These plasticizers can be used alone or in combination of two or more. The proportion of the plasticizer relative to 100 parts by weight of rubber is, for example, 5 parts by weight or more, ideally 10 parts by weight or more. Alternatively, the proportion relative to 100 parts by weight of rubber is, for example, 300 parts by weight or less, and even more ideally 200 parts by weight or less.

[0071] Rubber compositions may contain known additives such as plasticizers, anti-aging agents, antioxidants, colorants, fungicides, and non-rubber polymers, depending on their purpose and use.

[0072] The thickness of the seal 1a is not limited to a specific thickness. For example, the seal 1a may have a thickness of 1 to 40 mm. The thickness of the seal 1a may be 2 mm or more, 3 mm or more, or 5 mm or more. The thickness of the seal 1a may be less than 35 mm, less than 30 mm, less than 25 mm, or less than 20 mm.

[0073] A sealing structure can be provided using seal 1a. For example... Figure 4 As shown, the sealing structure 2 includes a first member 3a, a second member 3b, and a sealing element 1a. In the sealing structure 2, the sealing element 1a seals between the first member 3a and the second member 3b. With this configuration, for example, even if the surfaces of the first member 3a and the second member 3b that contact the sealing element 1a are rough surfaces, the sealing element 1a can easily adhere to those rough surfaces. Furthermore, the sealing element 1a can be easily peeled off from at least one of the first member 3a and the second member 3b at high speed.

[0074] like Figure 4 As shown, for example, at least one of the first component 3a and the second component 3b has a rough surface 32 that contacts the seal 1a. The arithmetic mean roughness R of the rough surface 32 is determined according to Japanese Industrial Standard (JIS) B0601:2013. a Not limited to a specific value. The arithmetic mean roughness R of rough surface 32. a For example, a roughness of 0.3 μm or higher. Even under such conditions, the seal 1a easily adheres to the rough surface 32. The arithmetic mean roughness R of the rough surface 32 a For example, below 1.0 μm.

[0075] Before use, seal 1a may be exposed to environments of various temperatures due to storage or transportation conditions. For example, it is sometimes ideal that the adhesive strength does not easily change even if seal 1a is stored or transported in an environment with higher temperatures. From this point of view, one can focus on the ratio F1 / F2 of adhesive strength F1 [N / 15mm] to adhesive strength F2 [N / 15mm]. Adhesive strength F1 [N / 15mm] is the adhesive strength measured by attaching seal 1a, which has been placed in monomer form at 60°C for 7 days, to a surface made of polypropylene (PP), and then stretching and peeling seal 1a in a direction of 90° relative to the PP surface. Adhesive strength F2 is the adhesive strength measured by attaching an initial sample of seal 1a, which has not been placed at 60°C for 7 days, to a surface made of PP, and then stretching and peeling seal 1a in a direction of 90° relative to the PP surface. Adhesive strength F1 or adhesive strength F2 can be measured, for example, by the method described in the examples.

[0076] As described above, the seal 1a may be exposed to environments of various temperatures before use due to storage or transportation conditions, and is not necessarily stored or transported in a high-temperature environment. Therefore, the ratio F1 / F2 of the seal 1a is not limited to a specific value. The ratio F1 / F2 is, for example, 0.5 or higher. In this case, even if the seal 1a is stored or transported in a high-temperature environment before use, the seal 1a can easily adhere to rough surfaces. The ratio F1 / F2 can also be less than 0.5.

[0077] Ideally, the F2 / F1 ratio should be above 0.55, even more ideally above 0.6, and further ideally above 0.65. An F2 / F1 ratio below 1 is acceptable.

[0078] The seal 1a can be modified from various perspectives. For example, one of the pair of adhesive tabs 10 can be an adhesive tab other than adhesive tab 10. In this case, the first dynamic shear storage modulus G'0 and the second dynamic shear storage modulus G' of the material of the adhesive tab are... 50 It can be 1.0×10 6 [Pa] or above, or 1.0 × 10 6 [Pa] and below.

[0079] Seal 1a can be as follows Figure 5 The seal 1b shown is modified as described. Except where specifically stated, seal 1b is constructed in the same manner as seal 1a. The same reference numerals are used for the constituent elements of seal 1b that are the same as or correspond to those of seal 1a, and detailed descriptions are omitted. The descriptions related to seal 1a also apply to seal 1b, provided there is no technical contradiction.

[0080] like Figure 5 As shown, the seal 1b includes an adhesive sheet 10 and a first layer 20 as a foam. The adhesive sheet 10 forms one end face 11 in the thickness direction of the seal 1b. The first layer 20 forms the other end face 12 in the thickness direction of the seal 1b.

[0081] Example The present invention will now be described in more detail through embodiments. However, the present invention is not limited to the following embodiments.

[0082] <Example 1> Asahi Kasei Corporation's SEBS resin TUFTEC H1041 and ENEOS Corporation's tackifier T-REZ HA125 were mixed at 165°C in proportions of 100 parts by weight and 80 parts by weight, respectively, to obtain a mixture. The styrene unit content in this SEBS resin was 30% by weight. The mixture was hot-pressed at 170°C and 4 MPa for 60 seconds to form a sheet with a thickness of 100 μm, obtaining the adhesive sheet of Example 1. Furthermore, the sheet, formed to a thickness of 300 μm under the same conditions, was punched into a circle with a diameter of 8 mm to produce the evaluation sample of Example 1.

[0083] Using the adhesive sheet from Example 1, three types of seals, 1A, 1B, and 1C, were fabricated. In seal 1A, foam No. 6800 manufactured by Nitto Denko Corporation was placed between two adhesive sheets from Example 1. In seal 1B, foam EE-1000 manufactured by Nitto Denko Corporation was placed between two adhesive sheets from Example 1. In seal 1C, one adhesive sheet from Example 1 and one foam EE-1000 manufactured by Nitto Denko Corporation were laminated. Foam No. 6800 is an EPDM foam with an independent bubble structure and a thickness of 10 mm. Foam EE-1000 is an EPDM foam with a continuous bubble structure and a thickness of 10 mm. Each seal was subjected to a pressure of 2 kPa for 5 minutes in an oven at 140°C to bond the adhesive sheet to the foam. Thus, the three types of seals from Example 1 were obtained.

[0084] <Example 2> Except as described below, the adhesive sheet of Example 2 and the evaluation sample of Example 2 were obtained in the same manner as in Example 1. The mixing ratio of SEBS resin and tackifier was changed to 100 parts by weight and 60 parts by weight. The adhesive sheet of Example 2 was used instead of the adhesive sheet of Example 1, and the seal of Example 2 was obtained in the same manner as the seal 1A.

[0085] <Example 3> Except as described below, the adhesive sheet of Example 3 and the evaluation sample of Example 3 were obtained in the same manner as in Example 1. Tackifier T-REZ HA105 was used instead of tackifier T-REZ HA125. The adhesive sheet of Example 3 was used instead of the adhesive sheet of Example 1; otherwise, the seal of Example 3 was obtained in the same manner as seal 1A.

[0086] <Example 4> Except as described below, the adhesive sheet of Example 4 and the evaluation sample of Example 4 were obtained in the same manner as in Example 1. Arkon P-100, manufactured by Arakawa Chemical Industry Co., Ltd., was used instead of T-REZHA125 as the tackifier. The adhesive sheet of Example 4 was used instead of the adhesive sheet of Example 1. Otherwise, the three seals of Example 4 were obtained in the same manner as seals 1A, 1B, and 1C.

[0087] <Example 5> Except as described below, the adhesive sheet of Example 5 and the evaluation sample of Example 5 were obtained in the same manner as in Example 1. Asahi Kasei Corporation's TUFTEC H1052 was used instead of TUFTEC H1041 as the SEBS resin. The styrene unit content in this SEBS resin was 20% by mass. The adhesive sheet of Example 5 was used instead of the adhesive sheet of Example 1. In addition, the three seals of Example 5 were obtained in the same manner as seals 1A, 1B, and 1C.

[0088] <Example 6> Except as described below, the adhesive sheet of Example 6 and the evaluation sample of Example 6 were obtained in the same manner as in Example 1. Asahi Kasei Corporation's TUFTEC H1062 was used instead of TUFTEC H1041 as the SEBS resin. The styrene unit content in this SEBS resin was 18% by mass. The adhesive sheet of Example 6 was used instead of the adhesive sheet of Example 1; otherwise, the seal of Example 6 was obtained in the same manner as seal 1A.

[0089] <Example 7> Except as described below, the adhesive sheet of Example 7 and the evaluation sample of Example 7 were obtained in the same manner as in Example 1. As the SEBS resin, a mixture of TUFTEC H1062 and TUFTEC H1517 was used instead of TUFTEC H1041. In this mixture, the mass ratio of TUFTEC H1062 to TUFTEC H1517 was 80:20. The styrene content in this SEBS resin mixture was 23% by mass. The adhesive sheet of Example 7 was used instead of the adhesive sheet of Example 1; otherwise, the seal of Example 7 was obtained in the same manner as seal 1A.

[0090] <Example 8> Except as described below, the adhesive sheet of Example 8 and the evaluation sample of Example 8 were obtained in the same manner as in Example 1. As the SEBS resin, a mixture of TUFTEC H1062 and TUFTEC H1517 was used instead of TUFTEC H1041. In this mixture, the mass ratio of TUFTEC H1062 to TUFTEC H1517 was 75:25. The styrene content in this SEBS resin mixture was 24.3% by mass. The adhesive sheet of Example 8 was used instead of the adhesive sheet of Example 1; otherwise, the three seals of Example 8 were obtained in the same manner as seals 1A, 1B, and 1C.

[0091] <Example 9> Except as described below, the adhesive sheet of Example 9 and the evaluation sample of Example 9 were obtained in the same manner as in Example 1. As the SEBS resin, a mixture of TUFTEC H1062 and TUFTEC H1517 was used instead of TUFTEC H1041. In this mixture, the mass ratio of TUFTEC H1062 to TUFTEC H1517 was 70:30. The styrene content in this SEBS resin mixture was 25.5% by mass. The adhesive sheet of Example 9 was used instead of the adhesive sheet of Example 1; otherwise, three seals of Example 9 were obtained in the same manner as seals 1A, 1B, and 1C.

[0092] <Example 10> Except as described below, the adhesive sheet of Example 10 and the evaluation sample of Example 10 were obtained in the same manner as in Example 1. As the SEBS resin, a mixture of TUFTEC H1062 and TUFTEC H1517 was used instead of TUFTEC H1041. In this mixture, the mass ratio of TUFTEC H1062 to TUFTEC H1517 was 65:35. The styrene content in this SEBS resin mixture was 26.8% by mass. The adhesive sheet of Example 10 was used instead of the adhesive sheet of Example 1. In addition, three seals of Example 10 were obtained in the same manner as seals 1A, 1B, and 1C.

[0093] <Comparative Example 1> Except as described below, the adhesive sheet of Comparative Example 1 and the evaluation sample of Comparative Example 1 were obtained in the same manner as in Example 1. Kraton D1155 SBS resin manufactured by Kraton Corporation was used instead of TUFTEC H1041. Arkon M-115 manufactured by Arakawa Chemical Industry Co., Ltd. was used instead of T-REZ HA125 as the tackifier. The mixing ratio of SBS resin and tackifier was adjusted to 100 parts by weight and 35 parts by weight. The adhesive sheet of Comparative Example 1 was used instead of the adhesive sheet of Example 1; otherwise, the seal of Comparative Example 1 was obtained in the same manner as seal 1A.

[0094] <Comparative Example 2> Except as described below, the adhesive sheet of Comparative Example 2 and the evaluation sample of Comparative Example 2 were obtained in the same manner as in Example 1. The mixing ratio of SEBS resin and tackifier was changed to 100 parts by weight and 120 parts by weight. The adhesive sheet of Comparative Example 2 was used instead of the adhesive sheet of Example 1, and the seal of Comparative Example 2 was obtained in the same manner as the seal 1A.

[0095] <Comparative Example 3> Except as described below, the adhesive sheet of Comparative Example 3 and the evaluation sample of Comparative Example 3 were obtained in the same manner as in Example 1. The mixing ratio of SEBS resin and tackifier was changed to a mixing ratio of 100 parts by weight and 40 parts by weight. The adhesive sheet of Comparative Example 3 was used instead of the adhesive sheet of Example 1, and the seal of Comparative Example 3 was obtained in the same manner as the seal 1A.

[0096] <Comparative Example 4> Except as described below, the adhesive sheet of Comparative Example 4 and the evaluation sample of Comparative Example 4 were obtained in the same manner as in Example 1. Kraton D1657 SEBS resin manufactured by Kraton Corporation was used instead of TUFTEC H1041. Arkon M-115 manufactured by Arakawa Chemical Industry Co., Ltd. was used instead of T-REZ HA125 as the tackifier. The mixing ratio of SEBS resin and tackifier was adjusted to 100 parts by weight and 60 parts by weight. The adhesive sheet of Comparative Example 4 was used instead of the adhesive sheet of Example 1; otherwise, the seal of Comparative Example 4 was obtained in the same manner as seal 1A.

[0097] (Dynamic viscoelasticity measurement) With the evaluation samples of each embodiment and comparative example held in a stainless steel clamp with a diameter of 8 mm, dynamic viscoelasticity measurements were performed using a TA Instruments ARES-G2 rotary rheometer under the following conditions. Based on the measurement results, the dynamic shear storage modulus G'0 at 0°C and 1 Hz, and the dynamic shear storage modulus G' at 50°C and 1 Hz were determined. 50The results are shown in Tables 1A, 1B, 1C, 1D, and 2.

[0098] Measurement mode: shear.

[0099] Frequency: 1Hz.

[0100] Axial load: 0.02N.

[0101] Temperature range: -50 to 180℃.

[0102] Heating rate: 5℃ / minute.

[0103] (Adhesion test on rough surfaces) The seals of each embodiment and comparative example were cut into rectangular shapes with a width of 20 mm and a length of 150 mm when viewed from above, to prepare test pieces for the rough surface adhesion test. The surface of a SUS304 steel plate was sanded for 30 seconds using a sander equipped with ♯600 grit sandpaper to create a rough surface. The arithmetic mean roughness R of the rough surface was determined according to JIS B0601:2013. a The thickness is 0.7 μm. The steel plate is 0.4 mm thick and has a rectangular shape with a width of 40 mm and a length of 200 mm when viewed from above. With the surface of the adhesive sheet of the test piece in contact with the rough surface of the steel plate, a 2 kg roller is moved back and forth once on the test piece to press it against the rough surface. After 10 seconds from pressing the test piece against the rough surface, the steel plate with the seal attached is tilted laterally, and the edge of the steel plate is tapped on a table 10 times. The adhesion of the seal is evaluated according to the following criteria.

[0104] Good: The seal adheres to the steel plate without any gaps.

[0105] Not enough: The seal has shifted and fallen off the steel plate, or a gap has been identified between a portion of the seal and the rough surface of the steel plate.

[0106] (High-speed peel test) The seals of each embodiment and comparative example were cut into rectangular shapes with a width of 20 mm and a length of 150 mm when viewed from above, to prepare test pieces for high-speed peel testing. With the surface of the adhesive sheet of the test piece in contact with the surface of a steel plate, a 2 kg roller was moved back and forth once on the test piece, pressing the test piece against the surface of the steel plate. The steel plate was 0.4 mm thick and had a rectangular shape with a width of 40 mm and a length of 200 mm when viewed from above. After pressing the test piece against the surface of the steel plate, the test piece and the steel plate were left to stand for 24 hours at 23°C and 50% relative humidity. Then, the test piece was peeled from the surface of the steel plate at a speed of 30 m / min and an angle of 30°. The ease of high-speed peeling was evaluated according to the following criteria.

[0107] Good: The seal is not broken, and no adhesive residue was found on the steel plate.

[0108] Not enough: The seal is broken, or adhesive residue is found on the steel plate.

[0109] The seals of each embodiment were punched into annular shapes with an inner diameter of 50 mm and an outer diameter of 70 mm to create test pieces for IPX7 testing. The test piece was placed between two acrylic sheets, with spacers placed around it between the sheets. The test piece was then fixed in a state that produced a specified compressive deformation in the thickness direction of the acrylic sheets. The acrylic sheets were Acrylite EX manufactured by Mitsubishi Chemical Co., Ltd., and had a thickness of 10 mm. This produced a sample for IPX7 testing. Acrylite is a registered trademark. The sample was submerged in a water tank filled to a height of 1 m. After 30 minutes, the sample was removed, and it was checked whether there was any leakage into the annular test piece to determine if it met the IPX7 standard. If there was no leakage, it could be evaluated as meeting the IPX7 standard.

[0110] (Adhesive strength after storage) Each of the seals from Examples 6 to 10 was cut into a rectangular shape with a width of 15 mm and a length of 150 mm when viewed from above. These were then placed in a constant temperature chamber set at 60°C for 7 days to obtain samples that had undergone preservation treatment. Alternatively, each of the seals from Examples 6 to 10 was cut into a rectangular shape with a width of 15 mm and a length of 150 mm when viewed from above, and these were not placed in a constant temperature chamber set at 60°C for 7 days to obtain initial samples. With each sample thus obtained in contact with the surface of a polypropylene (PP) sheet, a 2 kg roller was moved back and forth once over the sample to press it against the surface of the PP sheet. The PP sheet had a rectangular surface with a width of 40 mm and a length of 200 mm when viewed from above, and a thickness of 2 mm. Each sample pressed against the PP sheet was placed in an environment of 23°C and 50% relative humidity for 24 hours. Then, using the Autograph universal testing machine manufactured by Shimadzu Corporation, the sample was stretched at a speed of 300 mm / min at a 90° angle relative to the surface of the PP board, causing the sample to peel off from the surface, and the adhesive forces F1 and F2 were measured. The results are shown in Tables 1C and 1D.

[0111] As shown in Tables 1A, 1B, 1C, 1D, and 2, the evaluation results of the rough surface adhesion test and the high-speed peel test of the seals in each embodiment are "Good". The evaluation results of the high-speed peel test for the seals in Comparative Examples 1 and 3 are "Good", but the evaluation results of the rough surface adhesion test are "Not enough". Furthermore, the evaluation results of the rough surface adhesion test for the seals in Comparative Examples 2 and 4 are "Good", but the evaluation results of the high-speed peel test are "Not enough". Based on the comparison between the embodiments and comparative examples, it can be seen that in the material of the adhesive sheet of the seal, if the dynamic shear storage modulus G'0 at 0°C and 1Hz is greater than 1.0 × 10⁻⁶, then... 6 Pa is high, and the dynamic shear storage modulus G' at 50℃ and 1Hz is high. 50 Compared to 1.0×10 6 A lower Pa is advantageous from the perspective of applying seals to rough surfaces and peeling seals at high speeds.

[0112] According to Tables 1C and 1D, in the sealing components of Examples 6-10, the ratio (F1 / F2) of the adhesion force (F1) of the sample after preservation treatment to the surface of the PP plate to the adhesion force (F2) of the initial sample to the surface of the PP plate is 0.5 or more. Therefore, it can be considered that these seals can easily maintain high adhesion even if stored or transported at high temperatures before use, and the sealing components can easily adhere to rough surfaces.

[0113] A first aspect of the present invention provides an adhesive sheet, wherein the first dynamic shear storage modulus (G') of the material of the adhesive sheet at 1 Hz and 0 °C is greater than 1.0 × 10⁻⁶. 6 Pa is higher, and the second dynamic shear storage modulus (G') of the material at 1 Hz and 50 °C is 1.0 × 10⁻⁶. 6 Pa is low.

[0114] A second aspect of the present invention provides an adhesive sheet of the first aspect, wherein the ratio of the first dynamic shear storage modulus (G') to the second dynamic shear storage modulus (G') is 4.0 or more.

[0115] A third aspect of the present invention provides an adhesive sheet of the first or second aspect, wherein the material comprises a styrene-based elastomer having styrene units of 15% to 35% by weight.

[0116] The fourth aspect of the present invention provides an adhesive sheet according to any one of the first to third aspects, wherein the material comprises an elastomer and a tackifier, and the ratio of the content of the tackifier to the content of the elastomer is 0.5 to 1 by mass.

[0117] A fifth aspect of the present invention provides a sealing element comprising an adhesive sheet of any one of the first to fourth aspects and a first layer covered by the adhesive sheet.

[0118] The sixth aspect of the present invention provides a seal of the fifth aspect, wherein the first layer is a foam.

[0119] The seventh aspect of the present invention provides a seal of the fifth or sixth aspect, wherein the seal has a thickness of 1 to 40 mm.

[0120] The eighth aspect of the present invention provides a sealing structure, wherein the sealing structure comprises: a first component; a second component; and a sealing member of the fifth to seventh aspects, the sealing member sealing between the first component and the second component.

[0121] The ninth aspect of the present invention provides a sealing structure similar to the eighth aspect, wherein at least one of the first member and the second member has a rough surface in contact with the seal, and the arithmetic mean roughness R of the rough surface is determined according to Japanese Industrial Standard (JIS) B0601:2013. a It is above 0.3μm.

Claims

1. An adhesive sheet, wherein, The first dynamic shear storage modulus G' of the material of the adhesive sheet at 1 Hz and 0 °C is 1.0 × 10⁻⁶. 6 Pa is high. The second dynamic shear storage modulus G', which is the dynamic shear storage modulus G' of the material at 1 Hz and 50 °C, is 1.0 × 10⁻⁶. 6 Pa is low.

2. The adhesive sheet according to claim 1, wherein, The ratio of the first dynamic shear storage modulus G' to the second dynamic shear storage modulus G' is 4.0 or higher.

3. The adhesive sheet according to claim 1, wherein, The material comprises a styrene-based elastomer having styrene units of 15% to 35% by weight.

4. The adhesive sheet according to claim 1, wherein, The material comprises an elastomer and a tackifier. The ratio of the content of the tackifier to the content of the elastomer is 0.5 to 1 by mass.

5. A sealing element comprising: The adhesive sheet as claimed in any one of claims 1 to 4; and The first layer covered by the adhesive sheet.

6. The seal according to claim 5, wherein, The first layer is a foam.

7. The seal according to claim 5, wherein, The seal has a thickness of 1 to 40 mm.

8. A sealing structure, wherein, The sealing structure includes: First component; The second component; and The seal as described in claim 5, The seal seals the space between the first component and the second component.

9. The sealing structure according to claim 8, wherein, At least one of the first component and the second component has a rough surface that contacts the seal. The arithmetic mean roughness R of the rough surface as determined according to Japanese Industrial Standard JIS B0601:2013 a It is above 0.3μm.

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