JP6415049B2 - Sealing material - Google Patents

Description

  The present disclosure relates to a sealing material that is interposed between two members and seals a gap between the two members.

  Conventionally, sealing materials such as gaskets and packings have been used to fill the gaps between the two members to ensure sealing and water-stopping at the joint between the two members. Various materials such as rubber materials, foam materials such as urethane foam, and resin materials such as polytetrafluoroethylene are used.

  For example, Patent Document 1 discloses a packing used for a joint portion of a pipe connected by a flange. Patent Document 2 describes a front defroster nozzle for an automobile, and discloses that a seal member, which is an annular packing made of a foam, is interposed at a joint portion between a lower cylinder and an upper cylinder. Patent Document 3 discloses the use of a resin gasket in the structure of the door mirror arrangement portion of the vehicle. Further, Patent Document 4 discloses that in a waterproof structure of an outer wall joint, primary and secondary gaskets prevent rainwater from entering the room. Patent Document 5 discloses that a packing is used in a water tightness test apparatus for a joint portion of a pipe in order to keep the joint portion in a watertight state.

JP-A-9-96388 JP 2010-188791 A JP-A-10-315860 JP-A-6-26117 JP-A-9-280996

  The sealing material interposed between the two members is required to fill the gap between the members to ensure sufficient sealing and water-stopping properties. In particular, in a joint portion of a house member and a joint portion of a vehicle member, it is required that the water stoppage in the gap between the members is sufficiently ensured over a long period of time.

  However, with conventional sealing materials, even if sufficient water-stopping properties are ensured at the time of joining, a slight gap occurs due to deformation of the sealing material over time or deformation due to external force such as load during use, and water leaks from the gap. In some cases, the water stoppage may be lowered.

A sealing material according to one embodiment is a sealing material interposed between two members and sealing a gap between the two members, and a base material having followability to the gap, and the base material A water-absorbent resin particle fixed to at least a part with a fixed amount of 2.5 g / m ² or more.

  According to such a form, even when a slight gap is generated between the sealing material and the member, water leakage from the gap can be sufficiently prevented. For this reason, by using the said sealing material, the water stop in the junction part between two members can fully be ensured over a long period of time.

  In the sealing material according to another aspect, the base material may be a sheet-like base material, and the water-absorbent resin particles may be fixed on at least one surface of the sheet-like base material.

  The sealing material which concerns on this form may further be equipped with the adhesive bond layer provided on the other surface of the said sheet-like base material. Moreover, the sealing material according to this embodiment may be one in which the water-absorbing resin particles are fixed on both main surfaces of the sheet-like base material.

  In the sealing material according to another embodiment, the water absorbent resin particles may have an average particle size of 800 μm or less.

  In the sealing material according to another embodiment, the water absorbent resin particles may have a water absorption of 250 (g / g 30 minutes) or more.

  The sealing material which concerns on another form may be the said water-absorbing resin particle fixed on the said base material with binder resin.

  In the sealing material which concerns on another form, the said base material may be a base material consisting of a foam. In this embodiment, the foam may have a durometer-E hardness of 50 or less.

  In the sealing material which concerns on another form, the said base material may be a base material which consists of rubber-like elastic bodies.

  According to one aspect of the present disclosure, there is provided a sealing material that can sufficiently ensure water-stopping at a joint portion between two members over a long period of time.

(A) is sectional drawing which shows typically the one aspect | mode of a sealing material, (b) is sectional drawing which shows the other aspect of a sealing material typically. (A) is sectional drawing which shows the further another aspect of a sealing material typically, (b) is sectional drawing which shows the further another aspect of a sealing material typically. (A) is a cross-sectional perspective view which shows one of the modifications of a sealing material, (b) is a cross-sectional perspective view which shows the other modification of a sealing material, (c) is another deformation | transformation of a sealing material. It is a cross-sectional perspective view which shows an example, (d) is a cross-sectional perspective view which shows the other modification of a sealing material. It is a perspective view which shows typically the one aspect | mode of use of a sealing material. (A) is a perspective view which shows typically the other aspect of use of a sealing material, (b) is a perspective view which shows typically the other aspect of use of a sealing material. It is a perspective view which shows typically the water stop test in an Example.

  Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings depending on cases.

The sealing material according to the present embodiment is a sealing material that is interposed between two members and seals a gap between the two members. and water-absorbing resin particles fixed with a fixed amount of m ² or more.

  According to the sealing material according to the present embodiment, even when a slight gap is generated between the sealing material and the member, water leakage from the gap can be sufficiently prevented. For this reason, according to the sealing material which concerns on this embodiment, the water stop at the junction part between two members can fully be ensured over a long period of time.

  The above effect is considered to be produced for the following reason. That is, when a gap occurs between the sealing material and the member and water begins to enter the gap, the water absorbent resin particles absorb the water and swell, and the swollen water absorbent resin particles close the gap. More water intrusion is prevented. In addition, when the infiltration of water stops and the atmosphere is dry, the water absorbed in the water-absorbent resin particles is naturally dried and returns to the state before the water absorption, so that it can withstand repeated infiltration of water. It is done.

  Since the sealing material according to the present embodiment can sufficiently ensure the water-stopping property at the joint portion between the two members over a long period of time, the water-proofing properties such as the joint portion of the housing member and the joint portion of the vehicle member are ensured. It can use suitably for the use for doing.

  A base material will not be restrict | limited especially if it has the followable | trackability to the clearance gap between two members. As a base material, the base material conventionally used as a gasket or packing can be suitably selected and used according to the application use of a sealing material, for example.

  The shape of the substrate is not particularly limited, and may be, for example, a sheet-like substrate, a rectangular parallelepiped substrate, or a substrate having a three-dimensional shape along a gap between two members. Also good. The shape of the substrate can be appropriately selected depending on the shape of the joint portion of the member.

  The substrate may be a substrate made of a foam, for example. As the foam, a foam that can be used as a gasket or packing can be used without particular limitation.

  Examples of the foam include polyolefin foams such as polyethylene foam, polypropylene foam, ethylene-propylene copolymer foam, ethylene-vinyl acetate copolymer foam; polyethylene terephthalate foam, Polyester foams such as polyethylene naphthalate foam and polybutylene terephthalate foam; polyvinyl chloride foam; polystyrene foam; phenol resin foam; isocyanurate foam; vinyl acetate foam; Polyphenylene sulfide foams; polyamide foams; polyimide foams; polyurethane foams;

  As the foam, a foam having a durometer-E hardness (JISK6253 (2012), ISO7619) of 50 or less is preferable, and a foam of 40 or less is more preferable. When the durometer-E hardness of the foam is 50 or less, it becomes easy to obtain a sealing material excellent in conformity to unevenness, and the sealing material can be applied to a wide range of uses.

  In one aspect, the foam may have a durometer-E hardness of 5 or greater, and in another aspect, the foam may have a durometer-E hardness of 10 or greater. When the durometer-E hardness of the foam is 5 or more, the seal material is less likely to be deformed with time, and a gap is less likely to be formed between the seal material and the member, and the water stopping property of the seal material tends to be further improved.

  The substrate may be a substrate made of a rubber-like elastic body, for example. As the rubber-like elastic body, a rubber-like elastic body that can be used as a gasket or packing can be used without particular limitation. Examples of rubber-like elastic bodies include chloroprene rubber, butyl rubber, ethylene propylene diene rubber, ethylpropylene butyl rubber, polybutadiene rubber, polyisoprene rubber, polyisobutylene rubber, styrene butadiene rubber, and nitrile rubber. Examples thereof include rubber, fluorine rubber, silicone rubber, and urethane rubber.

  The base material may be a base material made of foamed rubber (a foam and a rubber-like elastic body). Examples of the foamed rubber include foamed ethylene propylene diene rubber, foamed chloroprene rubber, foamed ethylpropylene butyl rubber, foamed nitrile rubber, foamed natural rubber, foamed silicon rubber, and foamed styrene butadiene rubber.

  A base material may consist of materials other than a foam and a rubber-like elastic body. For example, the base material may be made of a resin material such as a polyester resin, a polyurethane resin, a phenol resin, a polyamide resin, a fluorine resin, a polyacetal resin, or a polyolefin resin.

  The water-absorbent resin particles only need to swell by absorbing and holding the water when contacted with water, and the composition is not particularly limited, and may be particles containing a known water-absorbent resin.

  Examples of the water-absorbent resin particles include sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, sodium polyacrylate cross-linked product, starch-acrylic acid graft copolymer, isobutylene-maleic anhydride copolymer, and ken And particles containing a water-absorbing resin such as polyaspartic acid.

  The water-absorbent resin particles are preferably particles having an average particle size of 800 μm or less, more preferably 500 μm or less, measured using a Microtrac MT3000 series manufactured by Nikkiso Co., Ltd. (Shibuya-ku, Tokyo). preferable. When the average particle diameter of the water-absorbent resin particles exceeds 800 μm, the water-absorbent resin particles are likely to fall off from the substrate, and storage stability and product reliability may be reduced.

  The lower limit of the average particle diameter of the water absorbent resin particles is not particularly limited. In one embodiment, the water absorbent resin particles can be fixed to the substrate by partially embedding the water absorbent resin particles in the substrate. In such an embodiment, when the water absorbent resin particles are completely buried in the substrate, the water absorbent resin particles may not be able to absorb water. That is, in this embodiment, it is desirable that the water-absorbent resin particles are fixed to the base material in a state in which a part thereof is embedded in the base material and the other part protrudes on the base material. The average particle diameter of the water-absorbent resin particles may be 10 μm or more, and such water-absorbent resin particles can be easily fixed on the substrate in the above-described desirable mode. Further, from the viewpoint of facilitating fixation on the base material, the average particle diameter of the water-absorbent resin particles may be 20 μm or more.

  In the present specification, the average particle diameter of the water-absorbent resin particles indicates the average particle diameter of the water-absorbent resin particles in a dry state, and in the particle size distribution obtained by the Nikkiso Co., Ltd. microtrack method, the value is the boundary. The average particle size was defined as the particle size at which the distribution areas on the side having the larger particle size and the side having the smaller particle size are equivalent.

  In one embodiment, the water-absorbent resin particles may be particles having a water absorption of 250 (g / g 30 minutes) or more. In another embodiment, the water absorption of the water absorbent resin particles may be 300 (g / g 30 minutes) or more. In still another embodiment, the water absorption of the water absorbent resin particles is 350 (g / g 30 minutes). ) Or more. According to the water-absorbent resin particles having such a water-absorbing property, it becomes possible to maintain a sufficient water stoppage even when a larger gap is generated, such as a joint part of a house member, a joint part of a vehicle member, etc. As a sealing material applied to the above, a more preferable sealing material can be obtained.

  Regarding the water absorption of the water-absorbent resin particles, the upper limit is not necessarily limited, but the water-absorbency may be such that it does not swell in the atmosphere during use. For example, the water absorption of the water absorbent resin particles may be 1000 (g / g 30 minutes) or less, or 800 (g / g 30 minutes) or less.

  In this specification, the water absorption of the water absorbent resin particles indicates a value measured according to JIS K 7223. The water absorption of the water absorbent resin particles “250 (g / g 30 minutes or more)” means that 250 g or more of water is absorbed in 30 minutes per 1 g of the water absorbent resin particles.

The water-absorbent resin particles are fixed to at least a part on the base material, and the fixed amount is 2.5 g / m ² or more. If the fixing amount is less than 2.5 g / m ² , sufficient water stoppage may not be obtained.

The fixed amount of the water-absorbent resin particles is preferably 3.0 g / m ² or more, and more preferably 4.0 g / m ² or more. By setting it as such a fixed amount, even if the clearance gap between a sealing material and a member becomes large, water-stopping property will fully be maintained. For this reason, the sealing material to which the water-absorbing resin particles are fixed in such a fixed amount can be particularly suitably applied to a joint portion of a house member, a joint portion of a vehicle member, and the like.

Although there is no restriction | limiting in particular in the upper limit of the fixed amount of a water absorbent resin particle, For example, the fixed amount of a water absorbent resin particle may be 100 g / m < ² > or less. Thereby, the stickiness which arises by absorbing the humidity in the air is suppressed, and the handleability is improved. Further, the fixed amount of the water absorbent resin particles may be 50 g / m ² or less, or 40 g / m ² or less.

  In the present specification, the fixed amount of the water-absorbing resin particles is the fixed amount of the water-absorbent resin particles fixed on the surface of the substrate, that is, the water absorption fixed so that at least a part is located outside the substrate. For example, water-absorbing resin particles embedded so as to be completely embedded in the base material are not included in the fixed amount.

  The water-absorbent resin particles are fixed on the surface of the substrate, but the mode of fixing is not particularly limited. For example, the water-absorbing resin particles can be fixed on the substrate by embedding a part of the water-absorbing resin particles in the substrate. In the sealing material to which the water-absorbing resin particles are fixed by such embedding, since a part of the water-absorbing resin particles are exposed on the surface of the base material, water absorption by the water-absorbing resin particles proceeds promptly and is excellent. A water-stopping property is obtained.

  When the water absorbent resin particles are fixed by being embedded in the base material, it is desirable that 40% or more of the volume of the water absorbent resin particles is embedded in the base material. Moreover, 50% or more of the volume of the water absorbent resin particles may be embedded in the base material. If the degree of embedding in the substrate is low, the water-absorbing resin particles are likely to fall off, and storage stability and product reliability may be reduced.

  In one aspect, when the water-absorbent resin particles are fixed by being embedded in the substrate, 10% or more of the volume of the water-absorbent resin particles may protrude from the substrate. In another aspect, 20% or more may protrude outside the substrate. By embedding in this way, the water absorption speed by the water-absorbent resin particles is further improved, and the water stoppage tends to be further improved.

  In addition, as a method of embedding the water-absorbing resin particles in the base material, for example, a method of extruding the base material and attaching the water-absorbing resin particles to the surface before curing, a water-absorbing resin on the surface of the flexible base material For example, a method of embedding by pressurizing after dispersing the particles.

  Moreover, the water-absorbing resin particles may be fixed on the base material with a binder resin. By fixing with the binder resin, the water-absorbent resin particles can be fixed more stably on the base material compared to fixing only by embedding in the base material, and more stable water-stopping can be achieved over a long period of time. Can be maintained.

  Any binder resin can be used without particular limitation as long as the water-absorbent resin particles can be fixed on the substrate. Examples of the binder resin include polyurethane resin, polyester resin, acrylic resin, phenol resin, and the like.

  When the binder resin is a resin having water absorbency, the water absorbent resin particles may be embedded in the binder resin. On the other hand, when the binder resin is a non-water absorbent resin, it is desirable that at least a part of the water absorbent resin particles protrude from the binder resin layer.

  As the binder resin, for example, a polyurethane resin can be suitably used. Since the polyurethane resin is water-absorbing, even when the binder resin encloses the water-absorbing resin particles, the water-absorbing resin particles can be fixed on the substrate without preventing water from penetrating into the water-absorbing resin particles. it can.

  Polyurethane resins include one-component polyurethane resins that cure by reacting with moisture in the air, block types that cure by heating, lacquer types that form a film by volatilization of solvents, and main component polyols and curing agents. Room temperature curing type two-component polyurethane resin in which the polyisocyanate is mixed at the time of use. Examples of the polyol include an acrylic polyol having a hydroxyl group in the molecule, a polyester polyol, a polyether polyol, and a polyurethane polyol. For polyisocyanate prepolymers, depending on the isocyanate used, toluene diisocyanate (TDI), polymethylene polyphenyl polyisocyanate (MDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and so on.

  An adhesive can also be used as the binder resin. That is, the sealing material may be one in which an adhesive, which is a binder resin, forms an adhesive layer on a base material, and water-absorbing resin particles are fixed to the adhesive layer.

  Examples of the adhesive include an acrylic adhesive, an epoxy adhesive, a urethane adhesive, and a silicone adhesive. The adhesive may be a pressure-sensitive adhesive (pressure-sensitive adhesive). Examples of the pressure-sensitive adhesive include natural rubber / synthetic rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and elastomer-based pressure-sensitive adhesives. And polyolefin pressure-sensitive adhesives.

  The thickness of the resin layer formed of the binder resin can be 5 μm or more, and can be 10 μm or more. By setting the thickness of the resin layer to 5 μm or more, the water-absorbent resin particles can be fixed on the substrate with a sufficient holding force.

  In one embodiment, the resin layer formed of the binder resin may have a thickness of 400 μm or less. In another aspect, the thickness of the resin layer formed of the binder resin may be 200 μm or less. By setting the thickness of the resin layer to 400 μm or less, the water-absorbent resin particles can be firmly fixed on the substrate without impairing the flexibility and followability of the substrate.

  The sealing material may further have an adhesive layer provided on a part of the base material. Since the sealing material having such an adhesive layer can be attached to one of the members to be joined via the adhesive layer, it can be easily interposed between the two members.

  The adhesive layer may be a layer containing a known adhesive, and the adhesive can be appropriately selected from known adhesives according to the material of the member to be joined, the material of the base material, and the like. Examples of adhesives that can be suitably used include acrylic adhesives, epoxy adhesives, urethane adhesives, silicone adhesives, and the like. The adhesive may be a pressure-sensitive adhesive (pressure-sensitive adhesive). As the pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, an elastomer-based pressure-sensitive adhesive, and a polyolefin-based pressure-sensitive adhesive. Agents and the like.

  Moreover, the adhesive layer may be formed of a double-sided pressure-sensitive adhesive tape having adhesive layers made of a pressure-sensitive adhesive on both main surfaces. Such an adhesive layer can be easily formed by applying a double-sided pressure-sensitive adhesive tape on the substrate.

  The thickness of the adhesive layer is not particularly limited as long as the desired adhesiveness can be obtained.

  In the sealing material having an adhesive layer, the adhesive layer may include water-absorbing resin particles. When the adhesive layer contains water-absorbing resin particles, the water stoppage at the contact surface between the member and the adhesive layer can be further improved.

  Hereinafter, a plurality of aspects of the sealing material according to the present embodiment will be described with reference to the drawings.

  Fig.1 (a) is sectional drawing which shows typically the one aspect | mode of a sealing material. 1A includes a sheet-like base material 2 and water-absorbing resin particles 1 fixed on one main surface (hereinafter referred to as a first main surface) of the sheet-like base material 2. . In the sealing material 100, the water-absorbent resin particles 1 are fixed by being partially embedded in the sheet-like substrate 2.

  In FIG. 1, no particular components are shown on the other main surface (hereinafter referred to as the second main surface) of the sheet-like substrate 2, but the sealing material 100 is the first material of the sheet-like substrate 2. An adhesive layer may be provided on the two main surfaces. Further, the sealing material 100 has the water-absorbing resin particles 1 fixed on the second main surface of the sheet-like substrate 2 (that is, the water-absorbing resin particles 1 on both main surfaces of the sheet-like substrate 2). May be fixed).

  FIG.1 (b) is sectional drawing which shows typically the other aspect of a sealing material. The sealing material 110 in FIG. 1B includes a sheet-like substrate 2 and water-absorbing resin particles 1 fixed on the first main surface of the sheet-like substrate 2 with a binder resin 3.

  In one embodiment of the sealing material 110, a resin having water absorption can be used as the binder resin 3. By covering the water absorbent resin particles 1 with the binder resin 3, the water absorbent resin particles 1 are firmly fixed on the main surface of the sheet-like substrate 2. Moreover, since the binder resin 3 is a resin having water absorbency, sufficient water stoppage can be obtained while the water absorbent resin particles 1 are covered with the binder resin 3.

  In FIG. 1 (b), no particular components are shown on the second main surface of the sheet-like substrate 2, but the sealing material 110 is an adhesive layer on the second main surface of the sheet-like substrate 2. May be provided. Further, the sealing material 110 has the water-absorbing resin particles 1 fixed on the second main surface of the sheet-like substrate 2 (that is, the water-absorbing resin particles 1 on both main surfaces of the sheet-like substrate 2). May be fixed).

  Fig.2 (a) is sectional drawing which shows typically the other aspect of a sealing material. 2A includes a sheet-like base material 12, water-absorbing resin particles 11 fixed on the first main surface of the sheet-like base material 12 by a binder resin 13, and the sheet-like base material 12. And an adhesive layer 14 provided on the second main surface. In the sealing material 120, the binder resin 13 may be a resin having no tack (for example, a urethane resin) or a resin functioning as an adhesive.

  FIG. 2B is a cross-sectional view schematically showing another aspect of the sealing material. The sealing material 130 of FIG.2 (b) is the 1st containing the water absorbing resin particle 11 and the 1st binder resin 13 which were provided on the sheet-like base material 12, and the 1st main surface of the sheet-like base material 12. FIG. And a second resin layer including the water absorbent resin particles 11 and the second binder resin 14 provided on the second main surface of the sheet-like substrate 12.

  In the sealing material 130, the first binder resin 13 and the second binder resin 14 may each be a resin having no tack (for example, a urethane resin) or a resin that functions as an adhesive.

  FIG. 3 is a cross-sectional perspective view schematically showing a modification of the sealing material according to the present embodiment. 3A includes a sheet-like base material 22, a binder resin layer 21 including water-absorbing resin particles provided on one main surface of the sheet-like base material 22, and a sheet-like base material. 22 and an adhesive layer 23 provided on the other main surface.

  3B includes a base material 32 having a predetermined three-dimensional shape, a binder resin layer 31 including water-absorbing resin particles provided on a part of the surface of the base material 32, and a base material. 32 and an adhesive layer 33 provided on the other surface. The three-dimensional shape of the base material 32 is formed such that when the sealing material 150 is interposed between two members, the gap between the two members is filled with the sealing material 150 and sealed.

  A sealing material 160 shown in FIG. 3C includes a rectangular parallelepiped base material 42 and a binder resin layer 41 including water-absorbing resin particles provided on the entire surface of the base material 42. Such a sealing material 160 can be suitably used when the two members to be joined are both uneven at the joint.

  The sealing material 170 shown in FIG.3 (d) is equipped with the disk-shaped base material 52 and the binder resin layers 51a and 51b containing the water absorbing resin particle provided on the main surfaces of both the base materials 52. is there. The sealing material 170 can be produced, for example, by cutting a sheet-like base material provided with the binder resin layers 51a and 51b on both main surfaces into a disk shape.

  FIG. 4 is a perspective view schematically showing one aspect of the use of the sealing material according to the present embodiment. In FIG. 4, the main surface of the first member 65 and the side portion of the second member 66 are joined via a sealing material 180. The sealing material 180 has a first main surface 61 and a second main surface 63, the second main surface 63 is joined to the main surface of the first member 65, and the first main surface 61 is the second member 66. It is interposed between the 1st member 65 and the 2nd member 66 so that it may join with the side part.

  Here, in the plate-like members such as the first member 65 and the second member 66, it is generally easy to form the main surface flat without unevenness, but the side portions are flattened to the same extent. It ’s difficult. For this reason, there exists a tendency for the clearance gap resulting from the unevenness | corrugation of the side part of a 2nd member to produce between the 2nd member 66 and the sealing material 180 easily. Therefore, it is desirable that the sealing material 180 has water-absorbing resin particles fixed on the first main surface 61 in contact with the side portion of the second member 66.

  For example, an adhesive layer may be provided on the second main surface 63 of the sealing material 180. In this case, the sealing material 180 is easily attached to the first member 65 by a method in which the sealing material 180 is attached to the first member 65 via an adhesive layer, and then the second member 66 is joined onto the sealing material 180. And between the second member 66 and the second member 66.

  Fig.5 (a) is a perspective view which shows typically the other aspect of use of the sealing material which concerns on this embodiment. In FIG. 5A, a sealing material 190 is interposed between the side part of the first member 75 and the side part of the second member 76. The sealing material 190 has a first joint surface 71 that joins the second member 76 and a second joint surface 73 that joins the first member 75.

  The sealing material 190 has water-absorbing resin particles fixed to at least one of the first bonding surface 71 and the second bonding surface 73, and water-absorbing both the first bonding surface 71 and the second bonding surface 73. Resin particles may be fixed.

  In the sealing material 190, at least one of the first bonding surface 71 and the second bonding surface 73 may have adhesiveness. That is, at least one of the first bonding surface 71 and the second bonding surface 73 may be a bonding surface made of an adhesive layer. Such a sealing material 190 is easily attached to either the first member 75 or the second member 76 through an adhesive bonding surface, and then the other member is bonded to easily the first member. 75 and the second member 76 can be interposed.

  FIG.5 (b) is a perspective view which shows typically the other aspect of use of the sealing material which concerns on this embodiment. In FIG. 5B, the main surface of the first member 85 and the main surface of the second member 86 are joined via the sealing material 200. The sealing material 200 has a first main surface 81 and a second main surface 83, the second main surface 83 is joined to the main surface of the first member 85, and the first main surface 81 is the second member 86. It is interposed between the first member 85 and the second member 86 so as to be joined to the main surface.

  The sealing material 200 has water absorbent resin particles fixed to at least one of the first main surface 81 and the second main surface 83, and the water absorbent resin particles fixed to both the first main surface 81 and the second main surface 83. May be.

  In the sealing material 200, at least one of the first main surface 81 and the second main surface 83 may have adhesiveness. That is, an adhesive layer may be provided on at least one of the first main surface 81 and the second main surface 83. In this case, the sealing material 200 can be easily obtained by applying the sealing material 200 to one of the first member 85 and the second member 86 via an adhesive layer and then joining the other member onto the sealing material 200. Can be interposed between the first member 85 and the second member 86.

  As mentioned above, although preferred embodiment was described, this indication is not limited to the said embodiment. For example, one aspect of the present disclosure may be a joining method in which the first member and the second member are joined via the sealing material. Further, another aspect of the present disclosure may be a method for manufacturing a sealing material in which the water-absorbing resin particles are fixed to a known gasket or packing to obtain a sealing material.

  Hereinafter, the disclosure will be described more specifically with reference to examples, but the present disclosure is not limited to the examples.

Example 1
On one surface of a sheet-like substrate made of butyl rubber, water-absorbing resin particles (manufactured by Sanyo Chemical Industries, “Sunfresh ST-500MPSA”, average particle diameter: 40 μm, water absorption: 400 (g / g 30 minutes)), Using a urethane resin solution (“Lamiol Mark III” manufactured by Sakata Inx Co., Ltd., 18% solid content toluene / methyl ethyl ketone / isopropyl alcohol mixed solution), it was fixed at a fixing amount of 3 g / m ² to prepare a sealing material.

Specifically, 50 g of water-absorbing resin particles were added to 150 g of a urethane resin solution and dispersed to obtain a coating solution. This coating solution was applied onto a substrate by knife coating so that the dry weight of the applied coating solution was 8 g / m ² . The applied coating solution was dried (drying conditions; 80 ° C., 30 minutes) to produce a sealing material.

(Examples 2 to 4)
A sealing material was produced in the same manner as in Example 1 except that the fixed amount of the water absorbent resin particles was changed to 4 g / m ² , 5 g / m ^2, and 6 g / m ² , respectively.

(Comparative Example 1)
The sheet-like base material made of butyl rubber was used as the sealing material of Comparative Example 1 without fixing the water-absorbent resin particles.

(Comparative Examples 2-3)
A sealing material was produced in the same manner as in Example 1 except that the fixed amount of the water absorbent resin particles was changed to 1 g / m ² and 2 g / m ² , respectively.

(Water-stop test 1)
FIG. 6 is a perspective view schematically showing a water-stop test in Examples. Water cut test was Seki置spacer 92 of thickness _{H 1} on the test plate 93, via the sealing material 210 test tube 91 (thickness 1 mm, internal diameter 10 mm) on top of the spacer 92 is formed by installing, The test apparatus was used. The sealing material 210 was installed so that the surface to which the water-absorbing resin particles were fixed was positioned on the spacer 92 side. Since the spacer 92 has a structure in which a part of the disk is missing, a gap surrounded by the test plate 93, the spacer 92, and the sealing material 210 is formed in the test apparatus.

The thickness _{H 1} of the spacers and 0.1 mm, when the reservoir water to the test tube 91, the case was able to accumulate water in the test tube 91 from the test plate 93 to the height of 100mm "A", 100mm of Before water accumulated to the height, the case where water leaked from the said gap was set to "B", and the water stop property of the sealing material was evaluated.

  Table 1 shows the results of the water-stop test 1 performed on the sealing materials of Examples 1 to 4 and Comparative Examples 1 to 3.

(Water-stop test 2)
On the surface of the sealing material on which the water-absorbing resin particles were fixed, 0.3 mL of water was dropped so as to spread over a range of 20 mm in diameter. When standing for 30 seconds and standing the seal material vertically, the case where the dripped water dripped is “B”, and the case where the dripped water is absorbed by the seal material and does not drip is “A”. The water stopping property was evaluated.

  Table 2 shows the results of the water-stop test 2 performed on the sealing materials of Examples 1 to 4 and Comparative Examples 1 to 3.

(Example 5)
A sealing material was produced in the same manner as in Example 2 except that the base material was changed to foamed chloroprene rubber (trade name NV-M, durometer-E hardness 23, manufactured by Daiwabo Progress Co., Ltd.) (adhesion amount 4 g / m ² ).

(Example 6)
A sealing material was produced in the same manner as in Example 2 except that the base material was changed to foamed EPDM (trade name E-4388, durometer-E hardness 20 manufactured by Inoac Corporation) (fixed amount 4 g / m). ² ).

(Example 7)
A sealing material was produced in the same manner as in Example 2 except that the base material was changed to foamed polyurethane (manufactured by Inoac Corporation, trade name ESH, durometer-E hardness 7) (adhesion amount 4 g / m ² ). .

(Example 8)
A sealing material was produced in the same manner as in Example 2 except that a polyester resin (trade name PAL, manufactured by Seiko Advance Co., Ltd.) was used instead of the urethane resin as the binder resin (fixed amount 4 g / m ² ).

Example 9
A sealing material was produced in the same manner as in Example 2 except that an acrylic resin (product name: NAN, manufactured by Teikoku Ink Co., Ltd.) was used as the binder resin instead of the urethane resin (adhesion amount 4 g / m ² ). .

  Table 3 shows the results of the water-stopping test 2 performed on the sealing materials of Examples 5 to 9.

  DESCRIPTION OF SYMBOLS 1,11 ... Water-absorbing resin particle, 2 and 12 ... Base material, 3, 13 and 14 ... Binder resin, 21, 31, 41, 51a and 51b ... Binder resin layer, 22, 32, 42 and 52 ... Base material, 23 and 33 ... adhesive layer, 65, 66, 75, 76, 85 and 86 ... member, 91 ... test tube, 92 ... spacer, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190 , 200 and 210... Sealing material.

Claims (9)

Is interposed between two members, to seal the gap between the two members, a sealing member for preventing water leakage from the gap,
A substrate having followability to the gap;
Water-absorbing resin particles fixed to at least a part of the base material with a fixing amount of 2.5 g / m ² or more;
Equipped with a,
The water-absorbent resin particles have a water absorption of 250 (g / g 30 minutes) or more;
A sealing material in which at least a part of the water-absorbent resin particles is exposed on the surface of the substrate. The substrate is a sheet-like substrate;
The sealing material according to claim 1, wherein the water-absorbent resin particles are fixed on at least one surface of the sheet-like substrate.   The sealing material of Claim 2 further provided with the adhesive bond layer provided on the other surface of the said sheet-like base material.   The sealing material according to claim 2, wherein the water-absorbent resin particles are fixed on both main surfaces of the sheet-like substrate.   The sealing material as described in any one of Claims 1-4 whose average particle diameter of the said water absorbing resin particle is 800 micrometers or less. The sealing material according to any one of claims 1 to 5 , wherein the water-absorbent resin particles are fixed on the base material with a binder resin. The sealing material according to any one of claims 1 to 6 , wherein the substrate is made of a foam. The sealing material according to claim 7 , wherein the foam has a durometer-E hardness of 50 or less. Wherein the substrate is made of a rubber-like elastic material, the sealing material as claimed in any one claims 1-6.

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