Method for manufacturing composite body, and foamed body joined product

Abstract

To provide a method for manufacturing a composite body that can join cross sections to which bubbles of a resin foam are exposed with sufficient strength, and a foamed body joined product.SOLUTION: There is provided a method for manufacturing a composite body. A method for manufacturing a composite body 100 includes: a first treatment step S10 of subjecting an exposure surface 11a of a first member 10 that is a foamed body having an exposure surface to which bubbles are exposed to plasma irradiation, and forming a first treatment surface 11b, and a joint step S40 of joining the first treatment surface 11b to a second member 20 through a resin layer 30b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for producing a composite and to a foam bonded article. [Background technology]

[0002] In recent years, resin molded products have been used in parts in various fields, such as automobiles, ships, aircraft, food, medicines, medical products, and home appliances. For example, silicone resins are used in automobile interior parts, electronic parts, medical device parts, packings, gaskets, sealing parts, etc., because they are excellent in heat resistance, water resistance, chemical resistance, weather resistance, ozone resistance, and cold resistance.

[0003] Furthermore, such resin molded articles are sometimes used in products by bonding together from various standpoints depending on the application and on the improvement of productivity.

[0004] When joining resin molded products, a joining method using an adhesive is generally used. For example, the technology of Patent Document 1 discloses a resin foam composite in which plate-shaped resin foams are joined in the stacking direction via a joint (adhesive). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-18512 A Summary of the Invention [Problem to be solved by the invention]

[0006] Here, the present inventors have found that there are highly demanded characteristics related to the bonding strength of a resin foam composite, which cannot be realized by the bonding method such as that of Patent Document 1. For example, this is the case when a plate-shaped resin foam is bonded to another member at a cross section (side surface) where the bubbles of the plate-shaped resin foam are exposed.

[0007] Therefore, an object of the present invention is to provide a method for manufacturing a composite body that can be bonded with sufficient strength even when the resin foam is bonded to another component at a cross section where the air bubbles of the resin foam are exposed, and a foam-bonded article. [Means for solving the problem]

[0008] The present inventors have conducted intensive research and found that the above-mentioned problems can be solved by irradiating a cross section of a resin foam where bubbles are exposed with plasma, and then bonding the resin foam to another member via a resin layer, and thus completed the present invention. That is, the present invention is as follows.

[0009] The embodiment (1) of the present invention is a first treatment step of irradiating an exposed surface of a first component, which is a foam having an exposed surface on which bubbles are exposed, with plasma to form a first treated surface; a joining step of joining the first treated surface to a second member via a resin layer; The present invention relates to a method for producing a composite.

[0010] The second aspect of the present invention is the second member is a foam having an exposed surface to which air bubbles are exposed; A second treatment step of irradiating an exposed surface of the second member with plasma to form a second treated surface, This is a method for producing a composite of the present invention (1), wherein the joining step is a step of joining the first treated surface to the second treated surface via a resin layer.

[0011] The third aspect of the present invention is A method for producing a composite of the present invention (1) or (2), wherein the first member is a silicone foam.

[0012] The fourth aspect of the present invention is A method for producing a composite of the present invention (2), wherein the second component is silicone foam.

[0013] The fifth aspect of the present invention is The method for producing the composite of the present invention (1) or (2), wherein the resin layer contains one or more resin materials selected from the group consisting of silicone-based resins, polyurethane-based resins, and acrylic-based resins.

[0014] The sixth aspect of the present invention is A composite body in which a plurality of foam bodies having an exposed surface on which air bubbles are exposed are bonded together, This is a foam bonded article in which the exposed surfaces that were irradiated with plasma are bonded together via a resin layer. Effect of the Invention

[0015] According to the present invention, it is possible to provide a method for producing a composite material and a foam-joined article that can bond a resin foam to another component with sufficient strength even when the resin foam is bonded to a cross-section where the air bubbles of the resin foam are exposed. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing the flow of a method for producing a composite according to the present embodiment. [Diagram 2] FIG. 2 is an explanatory diagram that illustrates the first processing step S10 according to this embodiment. [Diagram 3] FIG. 3 is an explanatory diagram that illustrates the second processing step S20 according to this embodiment. [Figure 4] Fig. 4(a) is a diagram showing the first member 10 to which the resin composition 30a is applied in the application step S30 according to this embodiment, and Fig. 4(b) is an enlarged view of the dotted line part in Fig. 4(a). [Diagram 5] FIG. 5 is an explanatory diagram that illustrates the bonding step S40 according to this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing a complex formed through the bonding step S40 according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The configuration, production method, and use of a composite according to one embodiment of the present invention will be described below, but the present invention is not limited thereto.

[0018] In the present invention, the density is the apparent density measured in accordance with JIS K7222:2005 "Foamed plastics and rubber - Determination of apparent density".

[0019] 1. Structure of the composite (foam joint) FIG. 6 is a schematic diagram showing a composite (foam-bonded article) 100 of this embodiment. As shown in FIG. 6, in the composite 100 of this embodiment, the exposed surface of the first member 10, which is a foam having an exposed surface with air bubbles exposed, is bonded to the second member 20 via a resin layer 30b. Note that, although this embodiment shows an example in which the composite is composed of the first member 10 and the second member 20, the present invention is not limited thereto, and the composite may further include one or more other members (such as a third member). Each component will be described below.

[0020] 1-1. First component / Second component 1-1-1.Shape In the composite 100 of this embodiment, the first member 10 and the second member 20 are preferably preformed bodies. The shapes (including size, volume, thickness, etc.) of the first member 10 and the second member 20 are not particularly limited and can be appropriately selected depending on the application of the composite. In the composite 100 of this embodiment shown in Fig. 6, the shapes of the first member 10 and the second member 20 are the same rectangular plate shape for ease of understanding.

[0021] 1-1-2.Material The materials of the first member 10 and the second member 20 are not particularly limited, and known materials can be appropriately selected and used depending on the application of the composite 100. From the viewpoint of obtaining sufficient bonding strength by plasma irradiation and the resin layer 30b described later, it is preferable that both the first member 10 and the second member 20 are resins. For example, silicone resin, fluororesin, polyurethane resin, polyester resin, polyethylene resin, polyvinyl chloride resin, acrylic resin, phenol resin, epoxy resin, vinyl chloride resin, vinyl ester resin, polyamide resin, polyurea resin, urea resin, etc. can be mentioned. In particular, the present inventors have verified the relationship between plasma treatment and bonding strength and have found that silicone resin, fluororesin, and polyurethane resin are more preferable than other resins, and silicone resin is even more preferable. Only one of these resins may be used, or more than one may be used in combination. In addition, it may be a homopolymer or a copolymer.

[0022] The silicone resin is not particularly limited as long as it contains a silane compound as a raw material monomer, and dimethyl silicone, methylphenyl silicone, and various modified silicones (for example, amino-modified silicone, epoxy-modified silicone, polyether-modified silicone emulsion, alkyl-modified silicone emulsion, fluorine-modified silicone, etc.) can be used. The silicone resin may be a copolymer such as a silicone-acrylic copolymer.

[0023] The first member 10 and / or the second member 20 are preferably resin foams, and more preferably silicone foams. Examples of silicone foams include solid-material silicone foams (such as millable silicone foams), liquid-material silicone foams (such as two-liquid silicone foams), and silicone foams using emulsions.

[0024] Millable silicone foam is a foam obtained by mixing and kneading various additives (fillers, dispersants, vulcanizing agents, etc.) with organopolysiloxane as the main raw material, and then heat curing it. By using a foaming agent (chemical foaming agent) as an additive, it is possible to make a foamed silicone resin. In addition, two-liquid silicone foam is a foam formed by foaming with gas (hydrogen) generated during curing by mixing and stirring two liquid silicone materials, and forming bubbles (cells). Furthermore, silicone foam using emulsion is a foam obtained by emulsifying silicone and water to prepare an emulsion composition, mechanically foaming the emulsion composition, and then curing (drying) it.

[0025] The first member 10 and the second member 20 may be made of only the above-mentioned resin, or may be made of fiber-reinforced plastic (FRP) reinforced with glass fiber or carbon fiber. The first member and the second member may be made of different types of resin or different materials. For example, the first member 10 may be made of silicone resin, and the second member 20 may be made of polyurethane resin. Alternatively, the first member 10 may be made of silicone resin, and the second member 20 may be made of a material other than resin (e.g., metal, glass, ceramics, etc.).

[0026] The composite 100 of this embodiment may be, for example, an example in which the first member 10 and the second member 20 are both formed from silicone foam. In this way, the composite 100 in which the first member 10 and the second member 20 are both formed from a resin foam such as silicone foam is particularly called a "foam-bonded article 100."

[0027] The first member 10 and the second member 20 may contain, in addition to the materials described above, other components, for example, additives such as colorants such as pigments, fillers, antioxidants, and ultraviolet protection agents.

[0028] 1-1-3.Foam structure It is more preferable that the first member 10 and / or the second member 20 are closed-cell foams. When the first member 10 and / or the second member 20 are closed-cell foams, when a resin composition (which becomes a resin layer 30b after curing) described later is applied (for example, coated or attached) to the bonding surfaces (first and second treated surfaces described later) of each member, the resin composition can be prevented from penetrating into the first member 10 or the second member 20 through the bubbles. Therefore, the resin composition remains near the bonding surfaces (first and second treated surfaces) of each member, and therefore a higher bonding strength can be achieved, particularly in the cross sections of the first member 10 and the second member 20.

[0029] The first member 10 and the second member 20 preferably have a foam layer and skin layers formed on two opposing surfaces of the foam layer. This is because bonding of foams having skin layers on their surfaces requires advanced bonding technology, particularly on the cross section of the foam.

[0030] 1-1-4. Density The density of the resin foam constituting the first member 10 can be adjusted as appropriate depending on the application of the composite 100. The density of the foam is, for example, 0.020 g / cm 3 More than 0.030g / cm 3 More than 0.040g / cm 3 More than 0.050g / cm 3 More than 0.075g / cm 3 More than 0.100g / cm 3 More than 0.120g / cm 3 or more, and 0.950 g / cm 3 Below 0.800g / cm 3 Below, 0.700g / cm 3 Below, 0.600g / cm 3 Below 0.550g / cm 3 Below 0.500g / cm 3 Below, 0.450g / cm 3 Below, 0.400g / cm 3 Below 0.350g / cm 3 Below, 0.300g / cm 3By setting the density of the resin foam within this range, the composite can be used in a wider range of applications.

[0031] When the second member 20 is made of resin like the first member 10, the second member 20 preferably has the same density as the above-mentioned first member 10. When the second member 20 is made of a material other than resin, the density is not particularly limited.

[0032] 1-1-5. Average cell size / porosity The average cell diameter in a cross section perpendicular to a plane (eg, a skin layer) of the first member 10 is not particularly limited and is, for example, preferably 5 μm to 400 μm, more preferably 5 μm to 300 μm, even more preferably 5 μm to 200 μm, and even more preferably 5 μm to 100 μm.

[0033] The porosity of the first member 10 is preferably 10% or more, 15% or more, or 20% or more, and is preferably 50% or less, 45% or less, or 40% or less.

[0034] When the second member 20 is formed of a resin like the first member 10, the second member 20 preferably has the same average cell size / porosity as the above-mentioned first member 10. When the second member 20 is formed of a material other than a resin, the average cell size / porosity is not particularly limited.

[0035] When the average cell diameter and porosity in a cross section perpendicular to a plane (e.g., a skin layer) are within such ranges, the resin composition described below can be easily applied to the first treated surface and / or the second treated surface, and the bonding strength can be further improved.

[0036] The average cell diameter in a cross section perpendicular to a plane (e.g., skin layer) can be measured by the following method.

[0037] Using a scanning electron microscope (SEM, for example, Keyence Corporation's VHXD-500), a cell photograph is taken of a cross section perpendicular to the main surface of the plane (for example, the skin layer). Then, using image processing software {for example, Image-ProPLUS (Media Cybernetics, 6.3ver)}, the diameter of each cell is measured. More specifically, the SEM image is read, and the contrast is adjusted to recognize the cells by contrast. Next, the shape of the cell is read using image processing (recognizing the shape as it is, not a perfect circle). Next, "Diameter (average)" is selected as the measurement item. Next, the diameter passing through the center of gravity of the object is measured at 2-degree intervals, and the average value is used to calculate the diameter of each cell.

[0038] The porosity of the first member 10 and / or the second member 20 is calculated as a percentage by dividing the apparent density of the foamed resin by the density of the unfoamed raw resin, and subtracting this divisor from 1. The measurement of the apparent density complies with JIS K7222:2005 "Foamed plastics and rubber - Determination of apparent density".

[0039] 1-2.Resin layer The "resin layer" according to this embodiment is a layer formed using a resin composition {known resin composition, for example, reactive or non-reactive polymer (for example, thermoplastic polymer, energy curable polymer), reactive compound (for example, polymerizable monomer, crosslinkable monomer), adhesive compound (for example, adhesive, pressure sensitive adhesive)}. Here, the "resin layer" may be a single layer or may be composed of multiple layers. In addition, when composed of multiple layers, these layers may be formed of different resin materials. Furthermore, the "resin layer" may contain parts or components that are not formed from the resin composition in addition to parts or components that are formed from the resin composition (for example, a substrate such as paper, nonwoven fabric, woven fabric, or film may be interposed, or may contain microcomponents such as fibers or fillers, which will be described later).

[0040] 1-2-1.Material The resin layer 30b is not particularly limited, and is preferably formed from one or more resin compositions selected from the group consisting of silicone-based resins, polyurethane-based resins, and acrylic-based resins. Among these, from the viewpoint of the bonding strength between the first member 10 and the second member 20, it is particularly preferable that the resin layer 30b is formed from a silicone-based resin.

[0041] The silicone-based resin is not particularly limited, and can be appropriately selected from known silicone-based resins, such as silicone rubber or silicone resin containing organopolysiloxane as the main component, which is cured by adding a crosslinking agent such as a siloxane-based crosslinking agent or a peroxide-based crosslinking agent.

[0042] The polyurethane resin is not particularly limited, and examples thereof include adhesives that utilize two-component curing urethane resins that contain various polyol compounds such as polyether polyols, polyester polyols, acrylic polyols, and polycarbonate diols, and curing agents such as the various isocyanate compounds described above.

[0043] The acrylic resin is not particularly limited, and examples thereof include adhesives containing a resin whose main component is (meth)acrylic acid or a derivative thereof (such as methyl methacrylate).

[0044] The resin layer 10 may be formed of one kind alone or a mixture of two or more kinds of these resins.

[0045] As described above, the resin layer 30b may contain other components, substrates, etc. in addition to the above-mentioned resins. For example, known additives such as oil components (plasticizers), tackifier resins, antioxidants, waxes, heat stabilizers, fillers, etc. may be blended as other components. These additives may be used alone or in combination of two or more. In addition, for example, when the resin layer 30b is a double-sided tape, a substrate made of paper or the like may be interposed.

[0046] 1-2-2. Placement The resin layer 30b is interposed between the first member 10 and the second member 20. The resin layer 30 is interposed between the first member 10 and the second member 20, so that the first member 10 and the second member 20 are fixed and bonded. The resin layer 30 at least partially (preferably entirely) covers the bonding surface (first treated surface) of the first member 10 and the bonding surface (second treated surface) of the second member 20. The area of ​​the resin layer 30 covering the first treated surface and the second treated surface is preferably 90% or more, 95% or more, or 99% or more of the area of ​​the first treated surface and the second treated surface. With this area, sufficient bonding strength can be obtained by bonding the first member 10 and the second member 20.

[0047] 1-2-3.Thickness The thickness of the resin layer 30b is preferably 300 μm or less, 200 μm or less, 180 μm or less, 150 μm or less, or 130 μm or less.

[0048] The thickness of the resin layer 30b is preferably 50 μm or more, 60 μm or more, 70 μm or more, 80 μm or more, or 90 μm or more.

[0049] By setting the thickness of the resin layer 30b within the above range, a higher bonding strength can be achieved, particularly in the cross sections of the first member 10 and the second member 20.

[0050] 2. Manufacturing method of the composite A method for producing the composite 100 of this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the flow of an example (S1) of a method for producing the composite 100 of this embodiment.

[0051] As shown in FIG. 1, the manufacturing method S1 of the composite of this embodiment includes a first processing step S10 of forming a first treated surface described below, a second processing step S20 of forming a second treated surface described below, an application step S30 of applying (e.g., coating, pasting) a resin composition to the first treated surface and / or the second treated surface, and a joining step S40 of joining the first treated surface and the second treated surface via a resin layer.

[0052] 2-1. First processing step S10 The first processing step S10 is a step of irradiating a surface (exposed surface) of the first member where the bubbles are exposed with plasma to form a first processed surface. Fig. 2 is an explanatory diagram that shows a schematic diagram of the first processing step S10.

[0053] As shown in FIG. 2, in this embodiment, for example, a rectangular, plate-like silicone foam is used as the first member 10. The surface of the first member 10 with the largest area is defined as surface A. A skin layer is formed on surface A and the surface opposite surface A, and a foam layer is formed between surface A and the surface opposite surface A. The first member 10 has four side surfaces. The side surfaces are cross sections of the silicone foam, and are surfaces (exposed surfaces) where bubbles in the foam layer are exposed. The side surfaces of the first member 10, that is, the surfaces (exposed surfaces) where bubbles are exposed, that are joined to the second member are defined as exposed surfaces 11a. When the exposed surface 11a is irradiated with plasma as described later, a first processed surface 11b is formed.

[0054] The first treated surface 11b may be formed on two or more of the four side surfaces of the first member 10. In this case, for example, a third member or the like can be further bonded. Alternatively, bonding can be performed even when the second member has a shape that requires two or more bonding surfaces (for example, a plate-like L-shape, etc.). Furthermore, multiple members including the first member 10 and the second member 20 can be bonded in a ring shape.

[0055] 2-1-1. Plasma irradiation The plasma irradiation performed in the first processing step S10 is to use a gas to bombard the plasma against at least a part of the surface of the object. Examples of the plasma irradiation include low pressure plasma treatment and atmospheric pressure plasma treatment. In this embodiment, atmospheric pressure plasma treatment is preferable from the viewpoint of cost and workability. That is, atmospheric pressure plasma does not require a device for creating a low pressure environment, so that the cost can be reduced and workability is excellent. In addition, since high-speed treatment can be performed any number of times on any part to be treated, localized and high-density plasma irradiation can be performed. The gas used for plasma irradiation is not particularly limited, and examples include nitrogen (N2), oxygen (O2), carbon dioxide (CO2), argon (Ar), helium (He), etc. Alternatively, a mixed gas of two or more of these gases may be used. The plasma output, gas flow rate, vacuum level, processing time, etc. can be adjusted. The processing conditions can be adjusted based on the wettability and spreading degree of the resin layer described later.

[0056] The exposed surface 11a of the first member 10 is irradiated with plasma to perform surface treatment, thereby forming a first treated surface 11b. Plasma irradiation enables a higher level of bonding that can withstand bonding on the side surfaces.

[0057] 2-2. Second processing step S20 The second processing step S20 is a step of irradiating a surface (exposed surface) of the silicone foam (foamed body) with exposed bubbles as the second member with plasma to form a second processed surface. Fig. 3 is an explanatory diagram showing a schematic diagram of the second processing step S20.

[0058] As shown in FIG. 3, in this embodiment, for example, a rectangular, plate-like silicone foam is used as the second member 20. The surface of the second member 20 with the largest area is defined as surface B. A skin layer is formed on surface B and the surface opposite surface B, and a foam layer is formed between surface B and the surface opposite surface B. The second member 20 has four side surfaces. The side surfaces are cross sections of the silicone foam, and are surfaces (exposed surfaces) where bubbles in the foam layer are exposed. Of the side surfaces of the second member 20, that is, the surfaces (exposed surfaces) where bubbles are exposed, the surface that is bonded to the first member is defined as exposed surface 21a. When the above-mentioned plasma treatment is performed on exposed surface 21a, a second treated surface 21b is formed.

[0059] That is, the exposed surface 21a of the second member is irradiated with plasma, and the surface is treated to form the second treated surface 21b. The plasma irradiation enables a higher level of bonding that can withstand bonding on the side surfaces.

[0060] The second treated surface 21b may be formed on two or more of the four side surfaces of the second member 20. In this case, for example, a third member or the like can be further bonded. Alternatively, bonding can be performed even when the first member has a shape that requires two or more bonding surfaces (for example, a plate-like L-shape). Furthermore, multiple members including the first member 10 and the second member 20 can be bonded in a ring shape.

[0061] In this embodiment, an example in which the second processing step S20 is performed after the first processing step S10 has been shown, but the present invention is not limited to this. For example, the second processing step S20 may be performed in parallel with the first processing step S10. Also, the order of the first processing step S10 and the second processing step S20 may be reversed. Furthermore, the second processing step S20 may not be performed.

[0062] 2-3.Applicable process S30 The application step S30 is a step of applying (e.g., coating or pasting) a resin composition 30a (which becomes a resin layer 30b after curing) to at least one of the first treated surface 11b and the second treated surface 21b described above. FIG. 4(a) is a schematic diagram showing the state in which the resin composition 30a is applied to the first treated surface 11b. FIG. 4(b) is an enlarged view of the area surrounded by the dotted line in FIG. 4(a). The resin composition 30a forms a resin layer 30b after curing.

[0063] The resin composition 30a is applied to the first treated surface 11b and / or the second treated surface 12b, the surfaces of which have been modified by the above-mentioned plasma irradiation, thereby bonding the first member 10 and the second member 20. That is, the resin composition 30a penetrates into voids in the first treated surface 11b and / or the second treated surface 12b, the surfaces of which have been modified, and the resin composition 30a is cured to form a resin layer 30b, which provides an anchor effect that bonds the first member 10 and the second member 20.

[0064] The resin composition 30a may be in the form of a coating agent, double-sided tape, or the like. The resin composition 30a is preferably a coating agent. Examples of the coating agent include room temperature curing silicone rubber, reactive polyurethane-based hot melt resin, and polyurethane-based resin for coating. These resins are liquid or paste-like before curing. Therefore, in the application step S30, the work of applying the resin composition 30a to the first treated surface 11b and the second treated surface 21b is easy to perform. In addition, even if some unevenness is formed on the first treated surface 11b and the second treated surface 21b, the resin composition 30a can be applied so as to fill the gap. The resin composition 30a easily penetrates into the gaps of the first treated surface 11b and the second treated surface 21b, and the adhesion area with the resin composition 30a becomes larger. Therefore, the anchor effect described above is further enhanced, and more sufficient adhesion can be obtained. Furthermore, since it is not necessary to form the first treated surface 11b and the second treated surface 21b smoothly in the first treatment step S10 and the second treatment step S20, the workability can be further improved.

[0065] When a coating agent is used for the resin composition 30a, the viscosity of the resin composition 30a before curing is preferably 200 mPa or more, 300 mPa or more, 400 mPa or more, and preferably 6,000 mPa or less, 5,000 mPa or less, 4,000 mPa or less, etc. By setting the viscosity within this range, more sufficient adhesiveness can be obtained.

[0066] Room temperature curing silicone rubber and reactive polyurethane hot melt resin are cured at room temperature due to moisture in the air. Polyurethane coating resin is cured at room temperature due to the evaporation of the solvent. Therefore, in the joining step S40 described later, when the first treated surface 11b and the second treated surface 21b are joined, the resin composition 30a is cured and fixed by simply pressing the first member 10 and the second member 20 for about 30 minutes to 1 hour. That is, the first member 10 and the second member 20 can be easily joined via the resin layer 30b, and the workability can be further improved. By adopting the above-mentioned configuration, a higher level of joining strength can be realized, especially in the cross section of the first member 10 and the second member 20.

[0067] When a coating agent is used for the resin composition 30a, the application method is not particularly limited, and a known application method can be used. For example, brush coating, spray coating, immersion, etc. can be used. The resin layer may be applied to either the first treated surface 11b or the second treated surface 21b. Alternatively, the resin layer may be applied to both the first treated surface 11b and the second treated surface 21b.

[0068] The resin used in the resin composition 30a is as described above in "1-2. Resin layer." In this embodiment, a coating agent made of, for example, a room temperature curing silicone resin is used as the resin composition 30a, and the coating agent is applied only to the first treatment surface 11b.

[0069] The amount of the resin composition 30a applied is adjusted depending on the application method, the number of applications, the concentration of the resin composition 30a, etc. The amount of the resin composition 30a applied is 150 to 700 g / m 2 It is preferable that the thickness is 200 to 600 g / m 2More preferably, 250 to 550 g / m 2 When the amount applied is within this preferred range, more sufficient adhesive strength can be obtained and damage to the resin layer 30b due to external stress can be further suppressed.

[0070] When the double-sided tape is used for the resin composition 30a, it is sufficient that the double-sided tape is attached to at least one of the first treated surface 11b and the second treated surface 22b. The double-sided tape may be attached to both surfaces. When the double-sided tape is used for the resin composition 30a, the first member 10 and the second member 20 can be fixed by simply pressing them together for a few seconds when bonding the first treated surface 11b and the second treated surface 21b in the bonding step S40.

[0071] 2-4.Joining process S40 The bonding step S40 is a step of bonding the first treated surface 11b and the second treated surface 21b via a resin composition 30a (which becomes a resin layer 30b after curing). Fig. 5 is an explanatory diagram that shows the bonding step S40. Fig. 6 is a diagram that shows a composite 100 formed through the bonding step S40.

[0072] As shown in Fig. 5, in this embodiment, the resin composition 30a formed on the first treated surface 11b in the above-mentioned application step S30 is brought into contact with the second treated surface 21b. The resin composition 30a is pressed against the second treated surface 21b for a predetermined time (e.g., several seconds) until the first member 10 and the second member 20 are bonded together by the resin layer 30. As shown in Fig. 6, when the resin composition 30a is fixed after the pressing, a resin layer 30b is formed, and a composite 100 in which the first member 10 and the second member 20 are bonded together by the resin layer 30b is obtained.

[0073] 3.Applications The application of the composite of this embodiment is not particularly limited, and it is used in parts in various fields such as automobiles, ships, aircraft, food, medicines, medical products, home appliances, etc. For example, it is used in automobile interior parts, electronic parts, medical equipment parts, packings, gaskets, sealing parts, etc. EXAMPLES

[0074] The laminate of the present invention will be specifically described below with reference to examples, but the present invention is not limited to these.

[0075] <First component / Second component> In the following examples and comparative examples, silicone foam (NanNex TL-7404 manufactured by Rogers Inoac Corp.) (density: 0.400 g / cm 3 ) was used as the first member and the second member. 3 The resin test pieces were 65 mm × 30 mm × 5 mm in size.

[0076] <Plasma irradiation> The surfaces (exposed surfaces) of the test pieces of the first and second components, each having exposed bubbles, that were to be joined to the other, were irradiated with plasma using a plasma irradiation device "Atmospheric Pressure Multi-Gas Plasma Jet Source" {SPR-DFMJ-01 (50 Hz)} (manufactured by Sunline Corporation) under the following conditions.

[0077] <Condition> Irradiation distance: 2mm Irradiation time: 5 seconds Gas flow rate: 8L / min

[0078] (Example 1-1) The above-mentioned plasma irradiation was performed on the exposed surfaces of the first member and the second member using nitrogen (N2), forming the first treated surface and the second treated surface, respectively. A silicone-based resin (SE 9187L manufactured by Dow Toray Co., Ltd.) was used as the resin composition, and the resin composition was applied to the first treated surface of the first member. The resin composition applied to the first treated surface was brought into contact with the second treated surface. The first and second members were pressed together for 3 seconds, and the resin layer was fixed, and then the composite of Example 1-1 in which the first and second members were joined was obtained.

[0079] (Example 1-2) A composite of Example 1-2 was obtained in the same manner as in Example 1-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using oxygen (O2).

[0080] (Examples 1-3) A composite of Example 1-3 was obtained in the same manner as in Example 1-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using carbon dioxide (CO2).

[0081] (Example 2-1) The exposed surfaces of the first member and the second member were irradiated with plasma using nitrogen (N2) to form the first treated surface and the second treated surface, respectively. A polyurethane resin (Nipolan 5120, manufactured by Tosoh Corporation) was used as the resin composition, and the resin composition was applied to the first treated surface of the first member. The resin composition applied to the first treated surface was brought into contact with the second treated surface. The two were pressed together for 3 seconds, and after the resin layer was fixed, the composite of Example 2-1 in which the first member and the second member were joined was obtained.

[0082] (Example 2-2) A composite of Example 2-2 was obtained in the same manner as in Example 2-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using oxygen (O2).

[0083] (Example 2-3) A composite of Example 2-3 was obtained in the same manner as in Example 2-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using carbon dioxide (CO2).

[0084] (Example 3-1) The exposed surfaces of the first member and the second member were irradiated with plasma using nitrogen (N2) to form the first treated surface and the second treated surface, respectively. As the resin composition, an acrylic resin double-sided tape (Sekisui Chemical Co., Ltd. #5782) was used, and the resin composition was attached to the first treated surface of the first member. The resin composition applied to the first treated surface was brought into contact with the second treated surface. The first and second members were pressed together for 3 seconds, and the resin layer was fixed, and then the composite of Example 3-1 in which the first and second members were joined was obtained.

[0085] (Example 3-2) A composite of Example 3-2 was obtained in the same manner as in Example 3-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using nitrogen (O2).

[0086] (Example 3-3) A composite of Example 3-3 was obtained in the same manner as in Example 3-1, except that the exposed surfaces of the first member and the second member were each irradiated with plasma using carbon dioxide (CO2).

[0087] (Comparative Example 1-1) The exposed surfaces of the first and second members were irradiated with nitrogen (N2) plasma to form the first and second treated surfaces, respectively. The first and second treated surfaces were brought into contact with each other without a resin layer and pressure-bonded for 3 seconds.

[0088] (Comparative Example 1-2) The procedure was the same as in Comparative Example 3-1, except that the exposed surfaces of the first member and the second member were irradiated with plasma using oxygen (O2).

[0089] (Comparative Example 1-3) The procedure was the same as in Comparative Example 3-1, except that the exposed surfaces of the first member and the second member were irradiated with plasma using carbon dioxide (CO2).

[0090] Comparative Example 2 The exposed surfaces of the first and second members were not irradiated with plasma. A polyurethane resin (Nipolan 5120, manufactured by Tosoh Corporation) was used as the resin composition, and the resin composition was applied to the exposed surface of the first member. The resin composition applied to the exposed surface of the first member was brought into contact with the exposed surface of the second member, and pressure-bonded as it was for 3 seconds.

[0091] <Tensile strength test> The tensile strength of the composites of each Example and Comparative Example was measured in accordance with JIS K6251:2010 "Vulcanized rubber and thermoplastic rubber - Determination of tensile properties". Specifically, the composites of each Example and Comparative Example were punched into dumbbell-shaped No. 3 test pieces to prepare them, and a tensile test was performed using an Instron material testing machine (Shimadzu Corporation, Autograph) at a crosshead speed of 200 mm / min to measure the bond strength. The bond strength was evaluated as follows. A:230kPa or more B: 150kPa or more and less than 230kPa C: No bonding The measurement and evaluation results of each of the examples and comparative examples are shown in Tables 1 and 2.

[0092] [Table 1]

[0093] [Table 2] [Explanation of symbols]

[0094] 10 First member 11a Exposed surface 11b First treatment surface 20 Second member 21a Exposed surface 21b Second treatment surface 30a Resin composition 30b Resin layer 100 Composite (Foam Bonded Product)

Claims

1. a first treatment step of irradiating a plasma onto an exposed surface of a first member, the exposed surface being a foam having bubbles exposed thereon, to form a first treated surface; a joining step of joining the first treated surface to a second member via a resin layer; A method for producing a composite, comprising:

2. the second member is a foam having an exposed surface to which air bubbles are exposed, A second processing step of irradiating the exposed surface of the second member with plasma to form a second processed surface, The method for producing a composite according to claim 1 , wherein the joining step is a step of joining the first treated surface to the second treated surface via the resin layer.

3. 3. The method for producing a composite according to claim 1, wherein the first member is a silicone foam.

4. The method of claim 2, wherein the second member is a silicone foam.

5. 3. The method for producing a composite according to claim 1, wherein the resin layer contains one or more resin materials selected from the group consisting of silicone-based resins, polyurethane-based resins, and acrylic-based resins.

6. A composite body formed by bonding multiple foams having exposed surfaces with exposed bubbles, in which the exposed surfaces that have been irradiated with plasma are bonded together via a resin layer.

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