WO2015100191A1 - Sealing material - Google Patents

Sealing material Download PDF

Info

Publication number
WO2015100191A1
WO2015100191A1 PCT/US2014/071783 US2014071783W WO2015100191A1 WO 2015100191 A1 WO2015100191 A1 WO 2015100191A1 US 2014071783 W US2014071783 W US 2014071783W WO 2015100191 A1 WO2015100191 A1 WO 2015100191A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing material
base material
water absorbing
resin particles
absorbing resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2014/071783
Other languages
French (fr)
Inventor
Hitoshi Morimoto
Ikuse NAKAMURA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of WO2015100191A1 publication Critical patent/WO2015100191A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2421/00—Presence of unspecified rubber
    • C09J2421/006—Presence of unspecified rubber in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C09J2475/006—Presence of polyurethane in the substrate

Definitions

  • the present disclosure relates to a sealing material interposed between two members that seals a gap between the two members.
  • sealing material such as a gasket, packing, or the like has been used to secure sealing performance and water stopping performance in a joining section between two members by embedding into a gap between two members, and various raw materials that have been used as such include silicon rubber or other rubber based material, urethane foam or other foam material,
  • Patent Document 1 discloses a packing used in a joint portion of a tube connected by a flange.
  • Patent Document 2 discloses a front defroster nozzle of an automobile where a sealing member that is an annular packing made of a foam body is interposed in a joining section between a lower cylindrical body and an upper cylindrical body.
  • Patent Document 3 discloses use of a gasket made of resin in a construction of a door mirror placement part of a vehicle.
  • Patent Document 4 discloses preventing rain water from penetration indoors by a primary or secondary gasket in a waterproof construction of an outer wall joint.
  • Patent Document 5 discloses use of packing to keep a joining section in a water tight state in a watertight testing device for a joining section of a tube.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. H09-96388A
  • Patent Document 2 Japanese Unexamined Patent Application Publication No. 2010-188791A
  • Patent Document 3 Japanese Unexamined Patent Application Publication No. H10-315860A
  • Patent Document 4 Japanese Unexamined Patent Application Publication No. H06-26117A
  • Patent Document 5 Japanese Unexamined Patent Application Publication No. H09-280996A
  • Securing sufficient sealing performance and water stopping performance is desired by embedding sealing material interposed between two members into the gap between the members.
  • the sealing material according to one embodiment of the present disclosure is a sealing material interposed between two members that seals a gap between the two members, wherein the sealing material is provided with a base material having gap filling conformability and deformation resistant
  • the base material may be a sheet-like base material, and the water absorbing resin particles may be fixed to at least one side of the sheet-like material.
  • the sealing material according to this embodiment may further provide an adhesive layer provided on the other side of the sheet-like base material. Further, the sealing material according to this embodiment may have the water absorbing resin particles fixed to both main surfaces of the sheet-like base material.
  • an average particle diameter of the water absorbing resin particles may be 800 micrometers or less.
  • the water absorbing resin particles may have water absorbing properties of 250 (g/g 30 min) or more.
  • the water absorbing resin particles may be fixed onto the base material by a binder resin.
  • the base material may be a base material made of a foam body.
  • the Asker C hardness of the foam body may be 50 or less.
  • the base material may be a base material made of a rubber-like elastic body.
  • a sealing material is provided that can sufficiently secure water stopping performance over a long period of time in a joining section between two members.
  • FIG. 1 A is a cross-sectional view schematically illustrating one aspect of the sealing material.
  • FIG. IB is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 2A is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 2B is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 3A is a cross-sectional perspective view schematically illustrating the sealing material according to a modified example.
  • FIG. 3B is also a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 3C is also a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 3D is also a cross-sectional view schematically illustrating another aspect of the sealing material.
  • FIG. 4 is a perspective view schematically illustrating one aspect of use of the sealing material.
  • FIG. 5A is a perspective view schematically illustrating another aspect of use of the sealing material.
  • FIG. 5B is a perspective view schematically illustrating another aspect of use of the sealing material.
  • FIG. 6 is a perspective view schematically illustrating a water stopping performance test in the working examples.
  • the sealing material according to this embodiment is a sealing material interposed between two members that seals a gap between the two members and is provided with a base material and water absorbing resin particles fixed at a fixed amount of not less than 2.5 grams/square meter onto at least a portion of the base material.
  • the sealing material according to this embodiment can sufficiently secure water stopping performance over a long period of time in a joining section between two members.
  • the above effect is considered to be achieved for the following reasons. That is, when a gap occurs between the sealing material and a member and water begins to penetrate into the gap, the water absorbing resin particles absorb the water and swell, and the gap is blocked by the swollen water absorbing resin particles thereby preventing further penetration of the water. Further, after water penetration has stopped and a dry atmosphere has returned, the moisture absorbed in the water absorbing resin particles dries naturally and returns to its pre-absorption state, and thus is understood to be able to withstand repeated water penetration.
  • the sealing material according to this embodiment can sufficiently secure water stopping performance over a long period of time in a joining section between two members, the sealing material can be suitably used for securing water stopping performance in a joining section between housing members and in a joining section between vehicle members, and the like.
  • the base material positioned in the gap between two members is not particularly restricted.
  • base materials used conventionally, for example, in gaskets or as packing materials may be used by appropriate selection according to applied use of the sealing material.
  • the shape of the base material is also not particularly restricted and may be, for example, a sheet-like base material, a rectangular shaped base material, or a base material having a three-dimensional shape along the gap between the two members.
  • the shape of the base material can be appropriately selected according to the shape of the joining section of the members.
  • the base material may be a base material made of, for example, a foam body.
  • a foam body any foam body that can be used as a gasket or packing material may be used without particular restriction.
  • the foam body examples include polyolefin based foams such as polyethylene foams, polypropylene foams, ethylene -propylene copolymer based foams, ethylene -vinyl acetate copolymer based foams; polyester based foams such as polyethylene terephthalate based foams, polyethylene naphthalate based foams, polybutylene terephthalate based foams; polyvinyl chloride foams; polystyrene foams; phenolic resin foams; isocyanurate foams; vinyl acetate foams; polyphenylene sulfide-based foams; polyamide based foams; polyimide foams; polyurethane foams, and the like.
  • polyolefin based foams such as polyethylene foams, polypropylene foams, ethylene -propylene copolymer based foams, ethylene -vinyl acetate copolymer based foams
  • polyester based foams such as
  • a foam body As the foam body, a foam body is used having an Type E durometer hardness (JISK6253 published in 2012,ISO7619) of 50 or less in one embodiment, and of 40 or less in another embodiment.
  • Type E durometer hardness of the foam body is 50 or less, the sealing material more easily achieves gap filling conformability and deformation resistant characteristics which enables the sealing material to be applied to broad uses.
  • the Type E durometer hardness of the foam body is 5 or greater, and in another embodiment, is 10 or greater.
  • the Type E durometer hardness of the foam body is 5 or greater there is less deformation over time of the sealing material making it less susceptible to gaps between the sealing material and the member, and thereby having a tendency to further improve the water stopping performance of the sealing material.
  • the base material may be a base material made of, for example, a rubber-like elastic body.
  • a rubber-like elastic body any rubber-like elastic body that can be used as a gasket or packing material may be used without particular restriction.
  • the rubber-like elastic body include chloroprene rubber, butyl rubber, ethylene-propylene-diene rubber, ethylpropylene butyl rubber, polybutadiene rubber, polyisoprene rubber, polyisobutylene rubber, styrene-butadiene rubber, nitrile rubber, fluoro rubber, silicone rubber, urethane rubber, and the like.
  • the base material may be a base material made of foam rubber-like elastic body.
  • foam a suitable rubber-like elastic body examples include foamed ethylene-propylene-diene rubber, foamed chloroprene rubber, foamed ethylpropylene butyl rubber, foamed nitrile rubber, natural foam rubber, foamed silicone rubber, foamed styrene-butadiene rubber, foamed polybutadiene, foamed polyisoprene, foamed polyisobutylene, foamed fluoro rubber, and foamed polyurethane, and the like.
  • the base material may be made of a material other than a foam rubber-like elastic body.
  • the base material may be made from resin material such as polyester resins, polyurethane resins, phenolic resins, polyamide resins, fluorine resins, polyacetal resins, polyolefin resins, and the like.
  • the water absorbing resin particles may be anything that swells by absorbing and retaining water when coming into contact with water, and may be particles that include known water absorbing resins, the composition of such being not particularly restricted.
  • water absorbing resin particles examples include particles that contain a water absorbing resin such as sodium polyacrylate, acrylic acid- vinyl alcohol copolymer, crosslinked sodium polyacrylate, starch- acrylic acid graft copolymers, isobutylene-maleic anhydride copolymers and saponified products thereof, polyaspartic acid, and the like.
  • a water absorbing resin such as sodium polyacrylate, acrylic acid- vinyl alcohol copolymer, crosslinked sodium polyacrylate, starch- acrylic acid graft copolymers, isobutylene-maleic anhydride copolymers and saponified products thereof, polyaspartic acid, and the like.
  • the water absorbing resin particles are preferably particles having an average particle diameter of 800 micrometers ( ⁇ ) or less, and more preferably 500 micrometers or less as determined by the Microtrac method (measured by Micro-track MT3000 series provided by Nikkiso Co., Ltd (Shibuya-ku Tokyo, Japan).
  • ⁇ micrometers
  • the average particle diameter of the water absorbing resin particles exceeds 800 micrometers, there is a tendency to drop off from the base material which may lead to a decrease in storage stability and product reliability.
  • the lower limit of the average particle diameter of the water absorbing resin particles is not particularly restricted. Note that, in one aspect, partially embedding the water absorbing resin particles into the base material enables the water absorbing resin particles to be fixed to the base material. In this type of aspect, completely burying the water absorbing resin particles into the base material may prevent the water absorbing resin particles from absorbing water. In other words, in this aspect, it is desired that the water absorbing resin particles be partially embedded into the base material and are fixed to the base material with the remaining portion protruding above the base material.
  • the average particle diameter of the water absorbing resin particles may be 10 micrometers or greater, and this type of water absorbing resin particle can easily fix onto the base material with the desired aspect described above. Further, from a perspective of more easily fixing onto the base material, the average particle diameter of the water absorbing resin particles may be 20 micrometers or greater.
  • the average particle diameter of the water absorbing resin particles indicates the average particle diameter of the water absorbing resin particles in a dry state
  • the average particle diameter is defined as a particle diameter where, when used as a boundary in a particle size distribution obtained by the Microtrac method provided by Nikkiso Co., Ltd, the distribution area of the particle diameter on the large side is equivalent to the distribution area of the particle diameter on the small side.
  • the water absorbing resin particles are particles having water absorbing properties of 250 (g/g 30 min) or greater. In another embodiment, the water absorbing properties of the water absorbing resin particles are 300 (g/g 30 min) or greater, and in a further embodiment 350 (g/g 30 min) or greater. With the water absorbing resin particles having this type of water absorbing properties, sufficient water stopping performance can be maintained even with the occurrence of larger gaps thereby enabling a more suitable sealing material to be obtained as a sealing material to be applied to a joining section between housing members, a joining section between vehicle members, and the like.
  • the water absorbing properties of the water absorbing resin particles are such that swelling does not occur under a use environment, and may be, for example, 1000 (g/g 30 min) or less or 800 (g/g 30 min) or less.
  • the water absorbing properties of the water absorbing resin particles indicate a value measured in compliance with JIS K 7223.
  • a water absorbing property of the water absorbing resin particles of "250 (g/g 30 min) or more" means 250 g of water or more is absorbed in 30 min per 1 g of water absorbing resin particles.
  • the water absorbing resin particles are fixed on at least a portion of the base material, and the fixed amount is 2.5 grams/square meter or greater. When the fixed amount is less than 2.5 grams/square meter, sufficient water stopping performance may not be obtained.
  • the fixed amount of the water absorbing resin particles is 3.0 grams/square meter or more, and in another embodiment 4.0 grams/square meter or more.
  • the sealing material having the water absorbing resin particles fixed in this type of fixed amount can be particularly suited for applying to a joining section between housing members, a joining section between vehicle members, and the like.
  • the fixed amount of the water absorbing resin particles may be, for example, 100 grams/square meter or less. At 100 grams/square meter or less tackiness that occurs by absorbing moisture in the air is suppressed and handling is favorable. Furthermore, the fixed amount of the water absorbing resin particles may be 50 grams/square meter or less or 40 grams/square meter or less.
  • the fixed amount of the water absorbing resin particles indicates a fixed amount of water absorbing resin particles fixed on the surface of the base material, in other words a fixed amount of water absorbing resin particles fixed so that at least a portion is positioned outside the base material.
  • the fixed amount of the water absorbing resin particles does not include, for example, a fixed amount of the water absorbing resin particles that are embedded so as to be completely buried in the base material.
  • the water absorbing resin particles are fixed onto the surface of the base material, but the aspect of fixation is not particularly restricted. For example, embedding a portion of the water absorbing resin particles into the base material enables the water absorbing resin particles to be fixed on to the base material. With the sealing material having the water absorbing resin particles fixed by embedding in this manner, because a portion of the water absorbing resin particles are exposed on the surface of the base material, water absorption by the water absorbing resin particles proceeds rapidly, thereby obtaining excellent water stopping performance.
  • the water absorbing resin particles When the water absorbing resin particles are fixed to the base material by embedding, it is desirable that 40% or more of the volume of the water absorbing resin particles are embedded into the base material. Further, 50% or more of the volume of the water absorbing resin particles may be embedded into the base material. A low degree of embedding into the base material brings about a tendency for the water absorbing resin particles to drop off which may lead to a decrease in storage stability and product reliability.
  • the water absorbing resin particles are embedded into the base material such that 10% or more of the volume of the water absorbing resin particles protrude outside the base material. In another embodiment 20% of the volume of the water absorbing resin particles or more protrude outside the base material. Embedding in this manner further improves the water absorption rate by the water absorbing resin particles thereby tending to further improve the water stopping performance.
  • examples of methods for embedding the water absorbing resin particles into the base material include methods where the base material raw materials are extrusion molded and the water absorbing resin particles are adhered to the surface prior to hardening, methods where the water absorbing resin particles are distributed on the surface of a soft base material and then embedded under applied pressure, and the like.
  • the water absorbing resin particles may be fixed onto the base material by a binder resin.
  • fixing using a binder resin allows the water absorbing resin particles to be more stably fixed onto the base material and enables a stable water stopping performance to be maintained over a long period of time.
  • binder resin may be used without particular restriction so long as the water absorbing resin particles can be fixed on to the base material.
  • the binder resin include polyurethane resins, polyester resins, acrylic resins, phenol resins, and the like.
  • the binder resin is a resin that has water absorbing properties
  • the water absorbing resin particles may be buried inside the binder resin.
  • the binder resin is a resin with non-water absorbing properties, it is desirable that at least a portion of the water absorbing resin particles protrude from the layer of the binder resin.
  • a polyurethane resin for example, can be suitably applied as the binder resin. Because polyurethane resins have water absorbing properties, the water absorbing resin particles can be fixed onto the base material without preventing penetration of the water into the water absorbing resin particles even if the water absorbing particles are buried inside or beneath the binder resin.
  • polyurethane resins include moisture curing types that cure by reacting with moisture in the air in a single solution polyurethane resin, block types that cure when heated, lacquer types where a film is formed by evaporation of a solvent, two part polyurethane resins where a main agent polyol is blended with a curing agent polyisocyanate at the time of use and which is moisture curing at room temperature, and the like.
  • polyols include acrylic polyols having a hydroxyl group in the molecule, polyester polyols, polyether polyols, polyurethane polyols, and the like.
  • isocyanates used in polyisocyanate prepolymers include Tolylene diisocyanate(TDI) -based,
  • an adhesive agent may be used as the binder resin.
  • the sealing material may such that an adhesive agent, which is a binder resin, forms an adhesive layer on the base material and the water absorbing resin particles are fixed to the adhesive layer.
  • adhesive agents examples include acrylic -based adhesive agents, epoxy-based adhesive agents, urethane -based adhesive agents, silicone-based adhesive agents, and the like.
  • the adhesive agent may be a pressure sensitive adhesive (PSA), and examples of pressure sensitive adhesives include natural and synthetic rubber-based pressure sensitive adhesives, acrylic-based pressure sensitive adhesives, silicone -based pressure sensitive adhesives, elastomer-based pressure sensitive adhesives, polyolefin-based pressure sensitive adhesives, and the like.
  • PSA pressure sensitive adhesive
  • the binder resin may contain alcoholic compounds. Providing an alcoholic compound enables less degradation of water absorption rate under high humidity condition and more stable water stopping performance than the case without any alcoholic compound.
  • the boiling points of the alcoholic compounds may be higher than 100 degrees C. By providing higher boiling point than 100 degrees C, the alcoholic compounds may not vaporize during the drying process of the binder solution etc. and therefore remain effective for resistance against humidity.
  • suitable alcoholic compounds include primary alcohol agents, such as 1 -pentanol, 1 -hexanol, 1 -octanol, secondary alcohol agents, such as 2-heptanol, 2-octanol, tertiary alcohol agents, such as isobutyl alcohol, polyol agents, such as ethylene glycol, glycerin, ethylene glycol monobutyl ether, and the like. Further, these alcoholic compounds may have other functional groups.
  • the thickness of the resin layer formed by the binder resin may be 5 ⁇ or greater, or may be 10 ⁇ or greater. Providing the resin layer with a thickness of 5 ⁇ or greater enables the water absorbing resin particles to fix onto the base material with sufficient retention.
  • the thickness of the resin layer formed by the binder resin is 400
  • micrometers or less and in another embodiment is 200 micrometers or less.
  • Providing the resin layer with a thickness of 400 micrometers or less enables the water absorbing resin particles to be firmly fixed onto the base material without losing the gap filling conformability and deformation resistant
  • the sealing material may further have an adhesive layer provided on a portion of the base material, for example, in the opposite side of the water absorbing particle.
  • the sealing material having this type of adhesive layer can be easily interposed between two members because the sealing material can be applied via the adhesive layer to one side of a joining member.
  • the adhesive layer may be a layer containing a known adhesive agent and can be appropriately selected from among known adhesive agents according to the material properties of the joining members, the material properties of the base material, and the like.
  • adhesive agents that can be suitably used include acrylic-based adhesive agents, epoxy-based adhesive agents, urethane -based adhesive agents, silicone-based adhesive agents, and the like.
  • the adhesive agent may be a pressure sensitive adhesive (PSA), and examples of pressure sensitive adhesives include natural and synthetic rubber-based pressure sensitive adhesives, acrylic -based pressure sensitive adhesives, silicone-based pressure sensitive adhesives, elastomer-based pressure sensitive adhesives,
  • polyolefin-based pressure sensitive adhesives and the like.
  • the adhesive layer may be formed by two-sided adhesive tape provided with an adhesive layer made of a pressure sensitive adhesive on both major surfaces. This type of adhesive layer can be easily formed by applying the two-sided adhesive tape onto the base material.
  • the thickness of the adhesive layer may be the thickness that obtains the intended adhesiveness.
  • the adhesive layer may contain the water absorbing resin particles.
  • the water stopping performance can be further improved in the contact surface between the member and the adhesive layer.
  • FIG. 1 A is a cross-sectional view schematically illustrating one aspect of the sealing material.
  • a sealing material 100 of FIG. 1A is provided with a sheet- like base material 2 and water absorbing resin particles 1 fixed onto one side surface of the sheet- like base material 2. In the sheet material 100, a portion of the water absorbing resin particles 1 are fixed by being embedded in the sheet-like base material 2.
  • the sealing material 100 may be provided with an adhesive layer on the other surface side of the sheet- like base material 2. Further, the sealing material 100 may have the water absorbing resin particles 1 also fixed to the other surface side of the sheet-like base material 2 (i.e., the water absorbing resin particles 1 fixed on both major surfaces of the sheet-like base material 2).
  • FIG. IB is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • the sealing material 110 of FIG. IB is provided with a sheet- like base material 2 and water absorbing resin particles 1 fixed by a binder resin 3 onto one surface side of the sheet-like base material 2.
  • a resin having water absorbing properties is used as a binder resin 3.
  • the water absorbing resin particles 1 are firmly fixed onto the surface of the sheet-like base material 2.
  • the binder resin 3 is a resin having water absorbing properties, sufficient water stopping performance can be obtained while covering the water absorbing resin particles 1 by the binder resin 3.
  • the sealing material 110 may be provided with an adhesive layer on the other major surface of the sheet- like base material 2. Further, the sealing material 110 may have the water absorbing resin particles 1 also fixed to the other major surface of the sheet- like base material 2 (i.e., the water absorbing resin particles 1 fixed on both major surfaces of the sheet-like base material 2).
  • FIG. 2A is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • a sealing material 120 of FIG. 2A is provided with a sheet- like base material 12, water absorbing resin particles 11 fixed by a binder resin 13 onto one major surface of the sheet- like base material 12, and an adhesive layer 14 provided on the other major surface of the sheet- like base material 12.
  • the binder resin 13 may be a resin that does not have tack (for example, urethane resin or the like), or it may be a resin that functions as an adhesive agent.
  • FIG. 2B is a cross-sectional view schematically illustrating another aspect of the sealing material.
  • a sealing material 130 of FIG. 2B is provided with the sheet- like base material 12, a first resin layer containing the water absorbing resin particles 11 and a first binder resin 13, provided on one major surface of the sheet-like base material, and a second resin layer containing the water absorbing resin particles 11 and a second binder resin 14 on the second major surface.
  • the first binder resin 13 and the second binder resin 14 may respectively be resins that do not have tack (for example, urethane resin or the like), or they may be resins that function as adhesive agents.
  • FIG. 3 is a cross-sectional perspective view schematically illustrating a modified example of the sealing material according to this embodiment.
  • a sealing material 140 of FIG. 3 A is provided with a sheet- like base material 22, a binder resin layer 21 containing water absorbing resin particles provided onto one major surface of the sheet-like base material 22, and an adhesive layer 23 provided on the other major surface of the sheet-like base material 22.
  • a sealing material 150 illustrated in FIG. 3B is provided with a base material 32 having a predetermined three-dimensional shape, a binder resin layer 31 containing water absorbing resin particles provided on the surface of a portion of the base material 32, and an adhesive layer 33 provided on another surface of the base material 32.
  • the three-dimensional shape of the base material 32 is formed so that the gap between two members is filled and sealed by the sealing material 150 when the sealing material 150 is interposed between the two members.
  • a sealing material 160 illustrated in FIG. 3C is provided with a base material 42 in a rectangular shape and a binder resin layer 41 containing water absorbing resin particles provided on the entire surface of the base material 42.
  • This type of sealing material 160 can be suitably used when either one of two joining members has unevenness in a joining section.
  • a sealing material 170 illustrated in FIG. 3D is provided with a base material 52 having a disk- like shape and binder resin layers 51a and 51b containing water absorbing resin particles provided on both major surfaces of the base material 52.
  • the sealing material 170 can be produced, for example, by cutting the sheet- like base material provided with the binder resin layers 51a and 51b on both major surfaces into a disk-like shape.
  • FIG. 4 is a perspective view schematically illustrating one aspect of use of the sealing material according to this embodiment.
  • the first major surface of the first member 65 and the side edge portion of the second member 66 are joined via a sealing material 180.
  • the sealing material 180 has a first major surface 61 and a second major surface 63 and the second major surface 63 joins with the first major surface of the first member 65.
  • the sealing material 180 is interposed between the first member 65 and the second member 66 so that the main first major surface 61 joins with the side edge portion of the second member 66.
  • the sealing material 180 have water absorbing resin particles fixed in the first major surface 61 that contacts the side edge portion of the second member 66.
  • An adhesive layer for example, may be provided on the second major surface 63 of the sealing material 180.
  • the sealing material 180 is applied to the first member 65 via the adhesive layer and then the second member 66 is joined onto the sealing material 180, and using this method, the sealing material 180 can be easily interposed between the first member 65 and the second member 66.
  • FIG. 5A is a perspective view schematically illustrating another aspect of use of the sealing material according to this embodiment.
  • a side edge portion of a first member 75 and a side edge portion of a second member 76 are joined via a sealing material 190.
  • the sealing material 190 has a second joining surface 73 that joins with the first member 75, and a first joining surface 71 that joins with the second member 76.
  • the sealing material 190 has water absorbing resin particles fixed to at least one side of the first joining surface 71 and the second joining surface 73, and the water absorbing resin particles may be fixed to both sides of the first joining surface 71 and the second joining surface 73.
  • the sealing material 190 may have adhesiveness on at least one side of the first joining surface 71 and the second joining surface 73.
  • at least one side of the first joining surface 71 and the second joining surface 73 may be a joining surface made of an adhesive layer.
  • FIG. 5B is a perspective view schematically illustrating another aspect of use of the sealing material according to this embodiment.
  • a first major surface of a first member 85 and a first major surface of a second member 86 are joined via a sealing material 200.
  • the sealing material 200 has a first major surface 81 and a second major surface 83, and the second major surface 83 joins with the first major surface of the first member 85.
  • the sealing material 200 is interposed between the first member 85 and the second member 86 so that the first major surface 81 joins with the first major surface of the second member 86.
  • the sealing material 200 has water absorbing resin particles fixed to at least one side of the first major surface 81 and the second major surface 83, and the water absorbing resin particles may be fixed to both sides of the first major surface 81 and the second major surface 83.
  • the sealing material 200 may have adhesiveness on at least one side of the first major surface 81 and the second major surface 83.
  • an adhesive layer may be provided on at least one side of the first major surface 81 and the second major surface 83.
  • the sealing material 200 is applied to one of either the first member 85 or the second member 86 via the adhesive layer and then the other member is joined onto the sealing material 200, and using this method, the sealing material 200 can be easily interposed between the first member 85 and the second member 86.
  • one aspect of the present disclosure may be a joining method where a first member and a second member are joined via the above sealing material.
  • another aspect of the present disclosure may be a manufacturing method of the sealing material wherein the water absorbing resin particles described above are fixed to a known gasket or packing material to obtain the sealing material.
  • Sealing material was prepared by fixing water absorbing resin particles (made by Sanyo Chemical Industries, Ltd., "SANFRESH ST-500 MPSA" average particle diameter: 40 micrometers, water absorbency: 400 (g/g 30 min)) onto one surface of a sheet- like base material made of butyl rubber at a fixed amount of 3 grams/square meter using a urethane resin solution (made by Sakata Inx
  • the water absorbing resin particles were added to 150 g of the urethane resin solution and dispersed to make a coating solution.
  • the coating solution was coated onto the base material using a knife coater so as to produce a dry weight of the applied coating solution of 8 grams/square meter.
  • the applied coating solution was allowed to dry (Dry Condition : 80 C, 10 minutes) to produce the sealing material.
  • Sealing material was prepared identically to working example 1 with the exception of modifying the fixed amount of the water absorbing resin particles to 4 grams/square meter, 5 grams/square meter, and 6 grams/square meter, respectively.
  • the sealing material of comparative example 1 uses the sheet- like base material made of butyl rubber as is without fixing the water absorbing resin particles.
  • Sealing material was prepared identically to working example 1 with the exception of changing the fixed amount of the water absorbing resin particles to 1 grams/square meter and 2 grams/square meter, respectively.
  • FIG. 6 is a perspective view schematically illustrating a water stopping performance test in the working examples.
  • the water stopping performance test was performed with a test device made by stacking a spacer 92 with a thickness Hi onto a test plate 93, and installing a test tube 91 (thickness 1 mm, inner diameter 10 mm) above the spacer 92 with the sealing material 210 therebetween. Note that, the sealing material 210 was installed so that the surface where the water absorbing resin particles were fixed was positioned on the spacer 92 side. Because the spacer 92 has a structure where a portion of the disk plate is missing, a gap is formed in the test device surrounded by the test plate 93, the spacer 92, and the sealing material 210.
  • the water stopping performance of the sealing material was evaluated for when the thickness Hi of the spacer is 0.1 mm and water was pooled in the test tube 91 , in that, "A” represents when water was pooled in the test tube 91 up to a height of 100 mm from the test plate 93, and "B” represents when water leaked from the gap prior to water pooling up to a height of 100 mm.
  • Sealing material was prepared identically to working example 2 with the exception of changing the base material to chloroprene rubber foam (made by Daiwabo Progress Co., Ltd., product name NV-M, Askers-C hardness 23) (fixed amount 4 grams/square meter).
  • Sealing material was prepared identically to working example 2 with the exception of changing the base material to EPDM foam (made by INOAC Corporation, product name E-4388, Askers-C hardness 20) (fixed amount 4 grams/square meter).
  • Sealing material was prepared identically to working example 2 with the exception of changing the base material to polyurethane foam (made by INOAC Corporation, product name ESH, Askers-C hardness 7) (fixed amount 4 grams/square meter).
  • Sealing material was prepared identically to working example 2 with the exception of using polyester resin (made by Seiko Advance Ltd., product name PAL) instead of urethane resin as a binder resin (fixed amount 4 grams/square meter).
  • Sealing material was prepared identically to working example 2 with the exception of using acrylic resin (made by Teikoku Printing Inks Mfg. Co., Ltd., product name NAN) instead of urethane resin as a binder resin (fixed amount 4 grams/square meter).
  • Sealing material was prepared identically to working example 1 with the exception of using mixture of acrylic pressure sensitive adhesive (made by Soken Chemical & Engineering Co., Ltd., product name SK-Dyne 1811 L) and ethylene glycol monobutyl ether ( 10% compared to binder resin) instead of urethane resin as a binder resin and changing the fixed amount to 12 grams/square meter.
  • acrylic pressure sensitive adhesive made by Soken Chemical & Engineering Co., Ltd., product name SK-Dyne 1811 L
  • ethylene glycol monobutyl ether 10% compared to binder resin
  • Sealing material was prepared identically to working example 1 with the exception of adding ethylene glycol monobutyl ether (30% compared to binder resin) to the binder resin and changing the fixed amount to 12 grams/square meter.
  • Sealing material was prepared identically to working example 10 with the exception of changing the amount of ethylene glycol monobutyl ether to 5%.
  • Sealing material was prepared identically to working example 10 with the exception of changing the amount of ethylene glycol monobutyl ether to 2%.
  • Sealing material was prepared identically to working example 10 with the exception of using 1 -octanol instead of ethylene glycol monobutyl ether as a high boiling point alcoholic compound.
  • Sealing material was prepared identically to working example 10 with the exception of eliminating ethylene glycol monobutyl ether.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Sealing Material Composition (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

Problem: To provide a sealing material that can sufficiently secure water stopping performance over a long period of time in a joining section between two members. Resolution Means: A sealing material interposed between two members that seals a gap between the two members, wherein the sealing material is provided with a base material having gap filling conformability and deformation resistant characteristics, and water absorbing resin particles fixed at a fixed amount of not less than 2.5 g/m2 onto at least a portion of the base material.

Description

SEALING MATERIAL
FIELD OF THE DISCLOSURE
The present disclosure relates to a sealing material interposed between two members that seals a gap between the two members.
BACKGROUND ART
Heretofore, sealing material such as a gasket, packing, or the like has been used to secure sealing performance and water stopping performance in a joining section between two members by embedding into a gap between two members, and various raw materials that have been used as such include silicon rubber or other rubber based material, urethane foam or other foam material,
polytetrafluoroethylene or other resin material, and the like.
For example, Patent Document 1 discloses a packing used in a joint portion of a tube connected by a flange. Further, Patent Document 2 discloses a front defroster nozzle of an automobile where a sealing member that is an annular packing made of a foam body is interposed in a joining section between a lower cylindrical body and an upper cylindrical body. Moreover, Patent Document 3 discloses use of a gasket made of resin in a construction of a door mirror placement part of a vehicle. Furthermore, Patent Document 4 discloses preventing rain water from penetration indoors by a primary or secondary gasket in a waterproof construction of an outer wall joint. Further, Patent Document 5 discloses use of packing to keep a joining section in a water tight state in a watertight testing device for a joining section of a tube.
PRIOR ART DOCUMENTS
Patent Documents
Patent Document 1 : Japanese Unexamined Patent Application Publication No. H09-96388A Patent Document 2: Japanese Unexamined Patent Application Publication No. 2010-188791A Patent Document 3: Japanese Unexamined Patent Application Publication No. H10-315860A Patent Document 4: Japanese Unexamined Patent Application Publication No. H06-26117A Patent Document 5: Japanese Unexamined Patent Application Publication No. H09-280996A
SUMMARY OF THE DISCLOSURE
Problems to be Solved by the Disclosure
Securing sufficient sealing performance and water stopping performance is desired by embedding sealing material interposed between two members into the gap between the members.
Particularly, securing sufficient water stopping performance in gaps between members over a long period of time in a joining section between housing members and in a joining section between vehicle members is desired.
However, with conventional sealing material, even if sufficient water stopping performance is secured at the time of joining, the water stopping performance may decrease as small gaps may appear due to deformation of the sealing material over time or due to deformation by an external force such as a load or the like during use and leaks may occur from these
Means to Solve the Problem
The sealing material according to one embodiment of the present disclosure is a sealing material interposed between two members that seals a gap between the two members, wherein the sealing material is provided with a base material having gap filling conformability and deformation resistant
characteristics and water absorbing resin particles fixed at a fixed amount of not less than 2.5 g/m 2 onto at least a portion of the base material.
With this type of embodiment, even if a small gap occurs between the sealing material and the member, leakage from such gap can be sufficiently prevented. Therefore, by using the above sealing material, water stopping performance over a long period of time in a joining section between two members can be sufficiently secured.
In the sealing material according to a different embodiment, the base material may be a sheet-like base material, and the water absorbing resin particles may be fixed to at least one side of the sheet-like material.
The sealing material according to this embodiment may further provide an adhesive layer provided on the other side of the sheet-like base material. Further, the sealing material according to this embodiment may have the water absorbing resin particles fixed to both main surfaces of the sheet-like base material.
In the sealing material according to a different embodiment, an average particle diameter of the water absorbing resin particles may be 800 micrometers or less.
In the sealing material according to a different embodiment, the water absorbing resin particles may have water absorbing properties of 250 (g/g 30 min) or more.
In the sealing material according to a different embodiment, the water absorbing resin particles may be fixed onto the base material by a binder resin.
In the sealing material according to a different embodiment, the base material may be a base material made of a foam body. Further, in this embodiment, the Asker C hardness of the foam body may be 50 or less.
In the sealing material according to a different embodiment, the base material may be a base material made of a rubber-like elastic body.
EFFECT OF THE DISCLOSURE
According to one aspect of the present disclosure, a sealing material is provided that can sufficiently secure water stopping performance over a long period of time in a joining section between two members.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 A is a cross-sectional view schematically illustrating one aspect of the sealing material. FIG. IB is a cross-sectional view schematically illustrating another aspect of the sealing material. FIG. 2A is a cross-sectional view schematically illustrating another aspect of the sealing material.
FIG. 2B is a cross-sectional view schematically illustrating another aspect of the sealing material. FIG. 3A is a cross-sectional perspective view schematically illustrating the sealing material according to a modified example.
FIG. 3B is also a cross-sectional view schematically illustrating another aspect of the sealing material.
FIG. 3C is also a cross-sectional view schematically illustrating another aspect of the sealing material.
FIG. 3D is also a cross-sectional view schematically illustrating another aspect of the sealing material.
FIG. 4 is a perspective view schematically illustrating one aspect of use of the sealing material. FIG. 5A is a perspective view schematically illustrating another aspect of use of the sealing material.
FIG. 5B is a perspective view schematically illustrating another aspect of use of the sealing material.
FIG. 6 is a perspective view schematically illustrating a water stopping performance test in the working examples.
DETAILED DESCRIPTION
Embodiments of the present disclosure will be described in detail hereinafter with reference to drawings at certain times.
The sealing material according to this embodiment is a sealing material interposed between two members that seals a gap between the two members and is provided with a base material and water absorbing resin particles fixed at a fixed amount of not less than 2.5 grams/square meter onto at least a portion of the base material.
With the sealing material according to this embodiment, even if a small gap occurs between the sealing material and the member, leakage from such gap can be sufficiently prevented. Therefore, the sealing material according to this embodiment can sufficiently secure water stopping performance over a long period of time in a joining section between two members.
The above effect is considered to be achieved for the following reasons. That is, when a gap occurs between the sealing material and a member and water begins to penetrate into the gap, the water absorbing resin particles absorb the water and swell, and the gap is blocked by the swollen water absorbing resin particles thereby preventing further penetration of the water. Further, after water penetration has stopped and a dry atmosphere has returned, the moisture absorbed in the water absorbing resin particles dries naturally and returns to its pre-absorption state, and thus is understood to be able to withstand repeated water penetration.
Because the sealing material according to this embodiment can sufficiently secure water stopping performance over a long period of time in a joining section between two members, the sealing material can be suitably used for securing water stopping performance in a joining section between housing members and in a joining section between vehicle members, and the like.
The base material positioned in the gap between two members is not particularly restricted. As the base material, base materials used conventionally, for example, in gaskets or as packing materials may be used by appropriate selection according to applied use of the sealing material.
The shape of the base material is also not particularly restricted and may be, for example, a sheet-like base material, a rectangular shaped base material, or a base material having a three-dimensional shape along the gap between the two members. The shape of the base material can be appropriately selected according to the shape of the joining section of the members.
The base material may be a base material made of, for example, a foam body. As the foam body, any foam body that can be used as a gasket or packing material may be used without particular restriction.
Examples of the foam body include polyolefin based foams such as polyethylene foams, polypropylene foams, ethylene -propylene copolymer based foams, ethylene -vinyl acetate copolymer based foams; polyester based foams such as polyethylene terephthalate based foams, polyethylene naphthalate based foams, polybutylene terephthalate based foams; polyvinyl chloride foams; polystyrene foams; phenolic resin foams; isocyanurate foams; vinyl acetate foams; polyphenylene sulfide-based foams; polyamide based foams; polyimide foams; polyurethane foams, and the like.
As the foam body, a foam body is used having an Type E durometer hardness (JISK6253 published in 2012,ISO7619) of 50 or less in one embodiment, and of 40 or less in another embodiment. When the Type E durometer hardness of the foam body is 50 or less, the sealing material more easily achieves gap filling conformability and deformation resistant characteristics which enables the sealing material to be applied to broad uses.
In one embodiment the Type E durometer hardness of the foam body is 5 or greater, and in another embodiment, is 10 or greater. When the Type E durometer hardness of the foam body is 5 or greater there is less deformation over time of the sealing material making it less susceptible to gaps between the sealing material and the member, and thereby having a tendency to further improve the water stopping performance of the sealing material.
The base material may be a base material made of, for example, a rubber-like elastic body. As the rubber-like elastic body, any rubber-like elastic body that can be used as a gasket or packing material may be used without particular restriction. Examples of the rubber-like elastic body include chloroprene rubber, butyl rubber, ethylene-propylene-diene rubber, ethylpropylene butyl rubber, polybutadiene rubber, polyisoprene rubber, polyisobutylene rubber, styrene-butadiene rubber, nitrile rubber, fluoro rubber, silicone rubber, urethane rubber, and the like.
Further, the base material may be a base material made of foam rubber-like elastic body.
Examples of foam a suitable rubber-like elastic body include foamed ethylene-propylene-diene rubber, foamed chloroprene rubber, foamed ethylpropylene butyl rubber, foamed nitrile rubber, natural foam rubber, foamed silicone rubber, foamed styrene-butadiene rubber, foamed polybutadiene, foamed polyisoprene, foamed polyisobutylene, foamed fluoro rubber, and foamed polyurethane, and the like.
The base material may be made of a material other than a foam rubber-like elastic body. For example, the base material may be made from resin material such as polyester resins, polyurethane resins, phenolic resins, polyamide resins, fluorine resins, polyacetal resins, polyolefin resins, and the like.
The water absorbing resin particles may be anything that swells by absorbing and retaining water when coming into contact with water, and may be particles that include known water absorbing resins, the composition of such being not particularly restricted.
Examples of the water absorbing resin particles include particles that contain a water absorbing resin such as sodium polyacrylate, acrylic acid- vinyl alcohol copolymer, crosslinked sodium polyacrylate, starch- acrylic acid graft copolymers, isobutylene-maleic anhydride copolymers and saponified products thereof, polyaspartic acid, and the like.
The water absorbing resin particles are preferably particles having an average particle diameter of 800 micrometers (μηι) or less, and more preferably 500 micrometers or less as determined by the Microtrac method (measured by Micro-track MT3000 series provided by Nikkiso Co., Ltd (Shibuya-ku Tokyo, Japan). When the average particle diameter of the water absorbing resin particles exceeds 800 micrometers, there is a tendency to drop off from the base material which may lead to a decrease in storage stability and product reliability.
The lower limit of the average particle diameter of the water absorbing resin particles is not particularly restricted. Note that, in one aspect, partially embedding the water absorbing resin particles into the base material enables the water absorbing resin particles to be fixed to the base material. In this type of aspect, completely burying the water absorbing resin particles into the base material may prevent the water absorbing resin particles from absorbing water. In other words, in this aspect, it is desired that the water absorbing resin particles be partially embedded into the base material and are fixed to the base material with the remaining portion protruding above the base material. The average particle diameter of the water absorbing resin particles may be 10 micrometers or greater, and this type of water absorbing resin particle can easily fix onto the base material with the desired aspect described above. Further, from a perspective of more easily fixing onto the base material, the average particle diameter of the water absorbing resin particles may be 20 micrometers or greater.
Note that, in this specification, the average particle diameter of the water absorbing resin particles indicates the average particle diameter of the water absorbing resin particles in a dry state, and the average particle diameter is defined as a particle diameter where, when used as a boundary in a particle size distribution obtained by the Microtrac method provided by Nikkiso Co., Ltd, the distribution area of the particle diameter on the large side is equivalent to the distribution area of the particle diameter on the small side.
In one embodiment the water absorbing resin particles are particles having water absorbing properties of 250 (g/g 30 min) or greater. In another embodiment, the water absorbing properties of the water absorbing resin particles are 300 (g/g 30 min) or greater, and in a further embodiment 350 (g/g 30 min) or greater. With the water absorbing resin particles having this type of water absorbing properties, sufficient water stopping performance can be maintained even with the occurrence of larger gaps thereby enabling a more suitable sealing material to be obtained as a sealing material to be applied to a joining section between housing members, a joining section between vehicle members, and the like.
Although the upper limit concerning the water absorbing properties of the water absorbing resin particles is not intended to be necessarily limited, the water absorbing properties are such that swelling does not occur under a use environment, and may be, for example, 1000 (g/g 30 min) or less or 800 (g/g 30 min) or less.
In this specification, the water absorbing properties of the water absorbing resin particles indicate a value measured in compliance with JIS K 7223. Note that a water absorbing property of the water absorbing resin particles of "250 (g/g 30 min) or more" means 250 g of water or more is absorbed in 30 min per 1 g of water absorbing resin particles.
The water absorbing resin particles are fixed on at least a portion of the base material, and the fixed amount is 2.5 grams/square meter or greater. When the fixed amount is less than 2.5 grams/square meter, sufficient water stopping performance may not be obtained.
In one embodiment the fixed amount of the water absorbing resin particles is 3.0 grams/square meter or more, and in another embodiment 4.0 grams/square meter or more. With this type of fixed amount, the water stopping performance can be sufficiently maintained even when gaps between the sealing material and the member become large. Therefore, the sealing material having the water absorbing resin particles fixed in this type of fixed amount can be particularly suited for applying to a joining section between housing members, a joining section between vehicle members, and the like.
Although the upper limit of the fixed amount of the water absorbing resin particles is not particularly limited, the fixed amount of the water absorbing resin particles may be, for example, 100 grams/square meter or less. At 100 grams/square meter or less tackiness that occurs by absorbing moisture in the air is suppressed and handling is favorable. Furthermore, the fixed amount of the water absorbing resin particles may be 50 grams/square meter or less or 40 grams/square meter or less.
Note that, in this specification, the fixed amount of the water absorbing resin particles indicates a fixed amount of water absorbing resin particles fixed on the surface of the base material, in other words a fixed amount of water absorbing resin particles fixed so that at least a portion is positioned outside the base material. The fixed amount of the water absorbing resin particles does not include, for example, a fixed amount of the water absorbing resin particles that are embedded so as to be completely buried in the base material.
The water absorbing resin particles are fixed onto the surface of the base material, but the aspect of fixation is not particularly restricted. For example, embedding a portion of the water absorbing resin particles into the base material enables the water absorbing resin particles to be fixed on to the base material. With the sealing material having the water absorbing resin particles fixed by embedding in this manner, because a portion of the water absorbing resin particles are exposed on the surface of the base material, water absorption by the water absorbing resin particles proceeds rapidly, thereby obtaining excellent water stopping performance.
When the water absorbing resin particles are fixed to the base material by embedding, it is desirable that 40% or more of the volume of the water absorbing resin particles are embedded into the base material. Further, 50% or more of the volume of the water absorbing resin particles may be embedded into the base material. A low degree of embedding into the base material brings about a tendency for the water absorbing resin particles to drop off which may lead to a decrease in storage stability and product reliability.
In one embodiment, the water absorbing resin particles are embedded into the base material such that 10% or more of the volume of the water absorbing resin particles protrude outside the base material. In another embodiment 20% of the volume of the water absorbing resin particles or more protrude outside the base material. Embedding in this manner further improves the water absorption rate by the water absorbing resin particles thereby tending to further improve the water stopping performance.
Note that, examples of methods for embedding the water absorbing resin particles into the base material include methods where the base material raw materials are extrusion molded and the water absorbing resin particles are adhered to the surface prior to hardening, methods where the water absorbing resin particles are distributed on the surface of a soft base material and then embedded under applied pressure, and the like.
Furthermore, the water absorbing resin particles may be fixed onto the base material by a binder resin. Compared to fixing by only embedding into the base material, fixing using a binder resin allows the water absorbing resin particles to be more stably fixed onto the base material and enables a stable water stopping performance to be maintained over a long period of time.
Any binder resin may be used without particular restriction so long as the water absorbing resin particles can be fixed on to the base material. Examples of the binder resin include polyurethane resins, polyester resins, acrylic resins, phenol resins, and the like.
If the binder resin is a resin that has water absorbing properties, the water absorbing resin particles may be buried inside the binder resin. Meanwhile, if the binder resin is a resin with non-water absorbing properties, it is desirable that at least a portion of the water absorbing resin particles protrude from the layer of the binder resin.
A polyurethane resin, for example, can be suitably applied as the binder resin. Because polyurethane resins have water absorbing properties, the water absorbing resin particles can be fixed onto the base material without preventing penetration of the water into the water absorbing resin particles even if the water absorbing particles are buried inside or beneath the binder resin.
Examples of polyurethane resins include moisture curing types that cure by reacting with moisture in the air in a single solution polyurethane resin, block types that cure when heated, lacquer types where a film is formed by evaporation of a solvent, two part polyurethane resins where a main agent polyol is blended with a curing agent polyisocyanate at the time of use and which is moisture curing at room temperature, and the like. Examples of polyols include acrylic polyols having a hydroxyl group in the molecule, polyester polyols, polyether polyols, polyurethane polyols, and the like. Examples of isocyanates used in polyisocyanate prepolymers include Tolylene diisocyanate(TDI) -based,
Polymethylene polyphenyl polyisocyanate(MDI)-based, Isophorone diisocyanate (IPDI)-based, hexamethylene diisocyanate ( HDI)-based, and the like.
Further, an adhesive agent may be used as the binder resin. In other words, the sealing material may such that an adhesive agent, which is a binder resin, forms an adhesive layer on the base material and the water absorbing resin particles are fixed to the adhesive layer.
Examples of adhesive agents include acrylic -based adhesive agents, epoxy-based adhesive agents, urethane -based adhesive agents, silicone-based adhesive agents, and the like. Moreover, the adhesive agent may be a pressure sensitive adhesive (PSA), and examples of pressure sensitive adhesives include natural and synthetic rubber-based pressure sensitive adhesives, acrylic-based pressure sensitive adhesives, silicone -based pressure sensitive adhesives, elastomer-based pressure sensitive adhesives, polyolefin-based pressure sensitive adhesives, and the like.
Furthermore, the binder resin may contain alcoholic compounds. Providing an alcoholic compound enables less degradation of water absorption rate under high humidity condition and more stable water stopping performance than the case without any alcoholic compound.
When the content of alcoholic compounds is less than 1% the effect of improvement of stability in humidity may not be sufficient.
The boiling points of the alcoholic compounds may be higher than 100 degrees C. By providing higher boiling point than 100 degrees C, the alcoholic compounds may not vaporize during the drying process of the binder solution etc. and therefore remain effective for resistance against humidity.
Examples of suitable alcoholic compounds include primary alcohol agents, such as 1 -pentanol, 1 -hexanol, 1 -octanol, secondary alcohol agents, such as 2-heptanol, 2-octanol, tertiary alcohol agents, such as isobutyl alcohol, polyol agents, such as ethylene glycol, glycerin, ethylene glycol monobutyl ether, and the like. Further, these alcoholic compounds may have other functional groups.
The thickness of the resin layer formed by the binder resin may be 5 μηι or greater, or may be 10 μηι or greater. Providing the resin layer with a thickness of 5 μηι or greater enables the water absorbing resin particles to fix onto the base material with sufficient retention.
In one embodiment the thickness of the resin layer formed by the binder resin is 400
micrometers or less, and in another embodiment is 200 micrometers or less. Providing the resin layer with a thickness of 400 micrometers or less enables the water absorbing resin particles to be firmly fixed onto the base material without losing the gap filling conformability and deformation resistant
characteristics or pliability of the base material.
The sealing material may further have an adhesive layer provided on a portion of the base material, for example, in the opposite side of the water absorbing particle. The sealing material having this type of adhesive layer can be easily interposed between two members because the sealing material can be applied via the adhesive layer to one side of a joining member.
The adhesive layer may be a layer containing a known adhesive agent and can be appropriately selected from among known adhesive agents according to the material properties of the joining members, the material properties of the base material, and the like. Examples of adhesive agents that can be suitably used include acrylic-based adhesive agents, epoxy-based adhesive agents, urethane -based adhesive agents, silicone-based adhesive agents, and the like. Moreover, the adhesive agent may be a pressure sensitive adhesive (PSA), and examples of pressure sensitive adhesives include natural and synthetic rubber-based pressure sensitive adhesives, acrylic -based pressure sensitive adhesives, silicone-based pressure sensitive adhesives, elastomer-based pressure sensitive adhesives,
polyolefin-based pressure sensitive adhesives, and the like.
Further, the adhesive layer may be formed by two-sided adhesive tape provided with an adhesive layer made of a pressure sensitive adhesive on both major surfaces. This type of adhesive layer can be easily formed by applying the two-sided adhesive tape onto the base material.
The thickness of the adhesive layer, although not particularly limited, may be the thickness that obtains the intended adhesiveness. In the sealing material having the adhesive layer, the adhesive layer may contain the water absorbing resin particles. When the adhesive layer contains the water absorbing resin particles, the water stopping performance can be further improved in the contact surface between the member and the adhesive layer.
A plurality of aspects of the sealing material according to this embodiment will be explained below with reference to the drawings.
FIG. 1 A is a cross-sectional view schematically illustrating one aspect of the sealing material. A sealing material 100 of FIG. 1A is provided with a sheet- like base material 2 and water absorbing resin particles 1 fixed onto one side surface of the sheet- like base material 2. In the sheet material 100, a portion of the water absorbing resin particles 1 are fixed by being embedded in the sheet-like base material 2.
In FIGS. 1 A and IB, configuring elements on the other surface side of the sheet-like base member 2 are not particularly illustrated, but the sealing material 100 may be provided with an adhesive layer on the other surface side of the sheet- like base material 2. Further, the sealing material 100 may have the water absorbing resin particles 1 also fixed to the other surface side of the sheet-like base material 2 (i.e., the water absorbing resin particles 1 fixed on both major surfaces of the sheet-like base material 2).
FIG. IB is a cross-sectional view schematically illustrating another aspect of the sealing material. The sealing material 110 of FIG. IB is provided with a sheet- like base material 2 and water absorbing resin particles 1 fixed by a binder resin 3 onto one surface side of the sheet-like base material 2.
With the sealing material 110, in one embodiment a resin having water absorbing properties is used as a binder resin 3. By covering the water absorbing resin particles 1 with the binder resin 3, the water absorbing resin particles 1 are firmly fixed onto the surface of the sheet-like base material 2.
Further, when the binder resin 3 is a resin having water absorbing properties, sufficient water stopping performance can be obtained while covering the water absorbing resin particles 1 by the binder resin 3.
In FIG. IB, configuring elements on the other major surface of the sheet- like base member 2 are not particularly illustrated, but the sealing material 110 may be provided with an adhesive layer on the other major surface of the sheet- like base material 2. Further, the sealing material 110 may have the water absorbing resin particles 1 also fixed to the other major surface of the sheet- like base material 2 (i.e., the water absorbing resin particles 1 fixed on both major surfaces of the sheet-like base material 2).
FIG. 2A is a cross-sectional view schematically illustrating another aspect of the sealing material. A sealing material 120 of FIG. 2A is provided with a sheet- like base material 12, water absorbing resin particles 11 fixed by a binder resin 13 onto one major surface of the sheet- like base material 12, and an adhesive layer 14 provided on the other major surface of the sheet- like base material 12. With the sealing material 120, the binder resin 13 may be a resin that does not have tack (for example, urethane resin or the like), or it may be a resin that functions as an adhesive agent.
FIG. 2B is a cross-sectional view schematically illustrating another aspect of the sealing material. A sealing material 130 of FIG. 2B is provided with the sheet- like base material 12, a first resin layer containing the water absorbing resin particles 11 and a first binder resin 13, provided on one major surface of the sheet-like base material, and a second resin layer containing the water absorbing resin particles 11 and a second binder resin 14 on the second major surface.
With the sealing material 130, the first binder resin 13 and the second binder resin 14 may respectively be resins that do not have tack (for example, urethane resin or the like), or they may be resins that function as adhesive agents.
FIG. 3 is a cross-sectional perspective view schematically illustrating a modified example of the sealing material according to this embodiment. A sealing material 140 of FIG. 3 A is provided with a sheet- like base material 22, a binder resin layer 21 containing water absorbing resin particles provided onto one major surface of the sheet-like base material 22, and an adhesive layer 23 provided on the other major surface of the sheet-like base material 22.
A sealing material 150 illustrated in FIG. 3B is provided with a base material 32 having a predetermined three-dimensional shape, a binder resin layer 31 containing water absorbing resin particles provided on the surface of a portion of the base material 32, and an adhesive layer 33 provided on another surface of the base material 32. The three-dimensional shape of the base material 32 is formed so that the gap between two members is filled and sealed by the sealing material 150 when the sealing material 150 is interposed between the two members.
A sealing material 160 illustrated in FIG. 3C is provided with a base material 42 in a rectangular shape and a binder resin layer 41 containing water absorbing resin particles provided on the entire surface of the base material 42. This type of sealing material 160 can be suitably used when either one of two joining members has unevenness in a joining section.
A sealing material 170 illustrated in FIG. 3D is provided with a base material 52 having a disk- like shape and binder resin layers 51a and 51b containing water absorbing resin particles provided on both major surfaces of the base material 52. The sealing material 170 can be produced, for example, by cutting the sheet- like base material provided with the binder resin layers 51a and 51b on both major surfaces into a disk-like shape.
FIG. 4 is a perspective view schematically illustrating one aspect of use of the sealing material according to this embodiment. In FIG. 4, the first major surface of the first member 65 and the side edge portion of the second member 66 are joined via a sealing material 180. The sealing material 180 has a first major surface 61 and a second major surface 63 and the second major surface 63 joins with the first major surface of the first member 65. The sealing material 180 is interposed between the first member 65 and the second member 66 so that the main first major surface 61 joins with the side edge portion of the second member 66.
Here, with members having a plate-like shape like the first member 65 and the second member 66, it is generally easy for the major surfaces to be formed flat without unevenness, but it is difficult for the side edge portion to be flattened to the same degree. On account of this, there is a tendency for a gap, caused by unevenness in the side edge portion of the second member, to easily occur between the second member 66 and the sealing material 180. Therefore, it is desirable that the sealing material 180 have water absorbing resin particles fixed in the first major surface 61 that contacts the side edge portion of the second member 66.
An adhesive layer, for example, may be provided on the second major surface 63 of the sealing material 180. In this case, the sealing material 180 is applied to the first member 65 via the adhesive layer and then the second member 66 is joined onto the sealing material 180, and using this method, the sealing material 180 can be easily interposed between the first member 65 and the second member 66.
FIG. 5A is a perspective view schematically illustrating another aspect of use of the sealing material according to this embodiment. In FIG. 5A, a side edge portion of a first member 75 and a side edge portion of a second member 76 are joined via a sealing material 190. The sealing material 190 has a second joining surface 73 that joins with the first member 75, and a first joining surface 71 that joins with the second member 76.
The sealing material 190 has water absorbing resin particles fixed to at least one side of the first joining surface 71 and the second joining surface 73, and the water absorbing resin particles may be fixed to both sides of the first joining surface 71 and the second joining surface 73.
The sealing material 190 may have adhesiveness on at least one side of the first joining surface 71 and the second joining surface 73. In other words, at least one side of the first joining surface 71 and the second joining surface 73 may be a joining surface made of an adhesive layer. Applying this type of sealing material 190 to either of the first member 75 or the second member 76 via a joining surface having adhesiveness and then joining to the other member allows the sealing material 190 to be easily interposed between the first member 75 and the second member 76.
FIG. 5B is a perspective view schematically illustrating another aspect of use of the sealing material according to this embodiment. In FIG. 5B, a first major surface of a first member 85 and a first major surface of a second member 86 are joined via a sealing material 200. The sealing material 200 has a first major surface 81 and a second major surface 83, and the second major surface 83 joins with the first major surface of the first member 85. The sealing material 200 is interposed between the first member 85 and the second member 86 so that the first major surface 81 joins with the first major surface of the second member 86.
The sealing material 200 has water absorbing resin particles fixed to at least one side of the first major surface 81 and the second major surface 83, and the water absorbing resin particles may be fixed to both sides of the first major surface 81 and the second major surface 83.
The sealing material 200 may have adhesiveness on at least one side of the first major surface 81 and the second major surface 83. In other words, an adhesive layer may be provided on at least one side of the first major surface 81 and the second major surface 83. In this case, the sealing material 200 is applied to one of either the first member 85 or the second member 86 via the adhesive layer and then the other member is joined onto the sealing material 200, and using this method, the sealing material 200 can be easily interposed between the first member 85 and the second member 86.
Several embodiments of the present disclosure have been described above, but the present disclosure is not limited to the above mentioned embodiments. For example, one aspect of the present disclosure may be a joining method where a first member and a second member are joined via the above sealing material. Furthermore, another aspect of the present disclosure may be a manufacturing method of the sealing material wherein the water absorbing resin particles described above are fixed to a known gasket or packing material to obtain the sealing material. Examples
The present disclosure is described more specifically below using working examples, but the present disclosure is not limited to the working examples.
Working Example 1
Sealing material was prepared by fixing water absorbing resin particles (made by Sanyo Chemical Industries, Ltd., "SANFRESH ST-500 MPSA" average particle diameter: 40 micrometers, water absorbency: 400 (g/g 30 min)) onto one surface of a sheet- like base material made of butyl rubber at a fixed amount of 3 grams/square meter using a urethane resin solution (made by Sakata Inx
Corporation, "Lamiall Mark III" 18% solid content toluene methyl ethyl ketone / isopropyl alcohol mixed solution).
Specifically, 50 g of the water absorbing resin particles were added to 150 g of the urethane resin solution and dispersed to make a coating solution. The coating solution was coated onto the base material using a knife coater so as to produce a dry weight of the applied coating solution of 8 grams/square meter. The applied coating solution was allowed to dry (Dry Condition : 80 C, 10 minutes) to produce the sealing material.
Working Examples 2 to 4
Sealing material was prepared identically to working example 1 with the exception of modifying the fixed amount of the water absorbing resin particles to 4 grams/square meter, 5 grams/square meter, and 6 grams/square meter, respectively.
Comparative Example 1
The sealing material of comparative example 1 uses the sheet- like base material made of butyl rubber as is without fixing the water absorbing resin particles.
Comparative Examples 2 to 3
Sealing material was prepared identically to working example 1 with the exception of changing the fixed amount of the water absorbing resin particles to 1 grams/square meter and 2 grams/square meter, respectively.
Water Stopping Performance Test 1
FIG. 6 is a perspective view schematically illustrating a water stopping performance test in the working examples. The water stopping performance test was performed with a test device made by stacking a spacer 92 with a thickness Hi onto a test plate 93, and installing a test tube 91 (thickness 1 mm, inner diameter 10 mm) above the spacer 92 with the sealing material 210 therebetween. Note that, the sealing material 210 was installed so that the surface where the water absorbing resin particles were fixed was positioned on the spacer 92 side. Because the spacer 92 has a structure where a portion of the disk plate is missing, a gap is formed in the test device surrounded by the test plate 93, the spacer 92, and the sealing material 210. The water stopping performance of the sealing material was evaluated for when the thickness Hi of the spacer is 0.1 mm and water was pooled in the test tube 91 , in that, "A" represents when water was pooled in the test tube 91 up to a height of 100 mm from the test plate 93, and "B" represents when water leaked from the gap prior to water pooling up to a height of 100 mm.
The results after conducting the water stopping performance test 1 are indicated in Table 1 for the sealing materials of working examples 1 to 4 and comparative examples 1 to 3.
Table 1
Figure imgf000014_0001
Water Stopping Performance Test 2
0.3 mL of water was dripped, so as to spread to a diameter of approximately 20 mm, onto a surface where water absorbing resin particles of the sealing material were fixed. After standing for 30 seconds, the sealing material was stood up vertically, and the water stopping performance of the sealing material was evaluated, "B" representing dripping of the dripped water, and "A" representing when the dripped water was absorbed by the sealing material without dripping.
The results after conducting the water stopping performance test 2 are indicated in Table 2 for the sealing materials of working examples 1 to 4 and comparative examples 1 to 3.
Table 2
Figure imgf000014_0002
Working Example 5
Sealing material was prepared identically to working example 2 with the exception of changing the base material to chloroprene rubber foam (made by Daiwabo Progress Co., Ltd., product name NV-M, Askers-C hardness 23) (fixed amount 4 grams/square meter).
Working Example 6
Sealing material was prepared identically to working example 2 with the exception of changing the base material to EPDM foam (made by INOAC Corporation, product name E-4388, Askers-C hardness 20) (fixed amount 4 grams/square meter).
Working Example 7
Sealing material was prepared identically to working example 2 with the exception of changing the base material to polyurethane foam (made by INOAC Corporation, product name ESH, Askers-C hardness 7) (fixed amount 4 grams/square meter).
Working Example 8
Sealing material was prepared identically to working example 2 with the exception of using polyester resin (made by Seiko Advance Ltd., product name PAL) instead of urethane resin as a binder resin (fixed amount 4 grams/square meter).
Working Example 9
Sealing material was prepared identically to working example 2 with the exception of using acrylic resin (made by Teikoku Printing Inks Mfg. Co., Ltd., product name NAN) instead of urethane resin as a binder resin (fixed amount 4 grams/square meter).
The results after conducting the water stopping performance test 2 are indicated in Table 3 for the sealing materials of working examples 5 to 9.
Table 3
Figure imgf000015_0001
Working Example 10
Sealing material was prepared identically to working example 1 with the exception of using mixture of acrylic pressure sensitive adhesive (made by Soken Chemical & Engineering Co., Ltd., product name SK-Dyne 1811 L) and ethylene glycol monobutyl ether ( 10% compared to binder resin) instead of urethane resin as a binder resin and changing the fixed amount to 12 grams/square meter.
Working Example 11
Sealing material was prepared identically to working example 1 with the exception of adding ethylene glycol monobutyl ether (30% compared to binder resin) to the binder resin and changing the fixed amount to 12 grams/square meter.
Working Example 12
Sealing material was prepared identically to working example 10 with the exception of changing the amount of ethylene glycol monobutyl ether to 5%.
Working Example 13
Sealing material was prepared identically to working example 10 with the exception of changing the amount of ethylene glycol monobutyl ether to 2%.
Working Example 14
Sealing material was prepared identically to working example 10 with the exception of using 1 -octanol instead of ethylene glycol monobutyl ether as a high boiling point alcoholic compound.
Comparative Example 4
Sealing material was prepared identically to working example 10 with the exception of eliminating ethylene glycol monobutyl ether.
Water Stopping Performance Test 3
0.4 mL of water was dripped, so as to spread to a diameter of approximately 20 mm, onto a surface where water absorbing resin particles of the sealing material were fixed. The time required for water absorption to be complete was measured once a day. This was done until the time exceeded 30 seconds for the first time. The number of days it took for the time to exceed 30 seconds was recorded.
The results after conducting the water stopping performance test 3 are indicated in Table 4 for the sealing materials of working examples 10 to 14 and comparative example 4.
Table 4
Figure imgf000016_0001
Exceeded 30
Seconds in Water
Stopping
Performance Test
3
Reference Numerals
1, 11 Water absorbing resin particles
2 and 12 Base material
3, 13, and 14 Binder resin
21, 31 , 41 , 51 a 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

Claims

What is claimed is:
1. A sealing material interposed between two members that seals a gap between the two members, the sealing material comprising:
a base material having gap filling conformability and deformation resistant characteristics; and water absorbing resin particles fixed at a fixed amount of not less than 2.5 grams/square meter on at least a portion of the base material.
2. The sealing material according to claim 1, wherein the base material is a sheet- like base material, and
the water absorbing resin particles are fixed onto at least one surface side of the sheet-like base material.
3. The sealing material according to claim 2, further comprising an adhesive layer provided on another surface of the sheet-like base material.
4. The sealing material according to claim 2, wherein the water absorbing resin particles are fixed onto both main surfaces of the sheet-like base material.
5. The sealing material according to any one of claims 1 to 4, wherein an average particle diameter of the water absorbing resin particles is 800 micrometers or less.
6. The sealing material according to any one of claims 1 to 5, wherein the water absorbing resin particles have water absorbing properties of 250 (g/g 30 min) or more.
7. The sealing material according to any one of claims 1 to 6, wherein the water absorbing resin particles are fixed onto the base material by a binder resin.
8. The sealing material according to any one of claims 1 to 6, wherein the water absorbing resin particles are fixed onto the base material by a binder resin and wherein a binder resin contains an alcoholic compound.
9. The sealing material according to any one of claims 1 to 7, wherein the base material is composed of a foam body.
10. The sealing material according to claim 8, wherein an Askers-C hardness of the foam body is not greater than 50.
11. The sealing material according to any one of claims 1 to 7, wherein the base material is composed of a rubber-like elastic body.
PCT/US2014/071783 2013-12-27 2014-12-22 Sealing material Ceased WO2015100191A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013271237A JP6415049B2 (en) 2013-12-27 2013-12-27 Sealing material
JP2013-271237 2013-12-27

Publications (1)

Publication Number Publication Date
WO2015100191A1 true WO2015100191A1 (en) 2015-07-02

Family

ID=53479594

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/071783 Ceased WO2015100191A1 (en) 2013-12-27 2014-12-22 Sealing material

Country Status (2)

Country Link
JP (1) JP6415049B2 (en)
WO (1) WO2015100191A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6857961B2 (en) * 2015-11-12 2021-04-14 日東エルマテリアル株式会社 Gap filling method and structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020001686A1 (en) * 1998-03-12 2002-01-03 Mitsubishi Gas Chemical Company, Inc Oxygen-absorbing multi-layer laminate, production method thereof and packaging container
US6964796B1 (en) * 1996-10-18 2005-11-15 Toyo Seikan Kaisha, Ltd. Oxygen-absorbing resin composition and packaging container, packaging material, cap or liner material having oxygen absorbability
US20110155224A1 (en) * 2009-12-28 2011-06-30 Samsung Sdi Co., Ltd. Photoelectric conversion device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63304080A (en) * 1987-06-03 1988-12-12 Nippon Shokubai Kagaku Kogyo Co Ltd Water stopping material and water stopping using said material
JPH01207375A (en) * 1988-02-15 1989-08-21 Sumitomo Electric Ind Ltd Composition for water stopping tape and water stopping tape using said composition
JP5227676B2 (en) * 2008-06-20 2013-07-03 株式会社イノアックコーポレーション Waterproof sealing material and manufacturing method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6964796B1 (en) * 1996-10-18 2005-11-15 Toyo Seikan Kaisha, Ltd. Oxygen-absorbing resin composition and packaging container, packaging material, cap or liner material having oxygen absorbability
US20020001686A1 (en) * 1998-03-12 2002-01-03 Mitsubishi Gas Chemical Company, Inc Oxygen-absorbing multi-layer laminate, production method thereof and packaging container
US20110155224A1 (en) * 2009-12-28 2011-06-30 Samsung Sdi Co., Ltd. Photoelectric conversion device

Also Published As

Publication number Publication date
JP6415049B2 (en) 2018-10-31
JP2015124344A (en) 2015-07-06

Similar Documents

Publication Publication Date Title
CN110753809B (en) Supporting elastomeric foam and method of making same
US20170137670A1 (en) Waterproof tape having improved adhesion and manufacturing method thereof
JP5697770B2 (en) Solar panel sealing material and solar cell module
JP6223477B2 (en) Adhesive sheet
US8501310B2 (en) Foam waterproofing material with a micro cell structure
JP5699314B2 (en) Cover material for flat cable and flat cable using the same
JP2010037353A (en) Method of manufacturing closed-cell urethane sheet, and waterproof sealing material
WO2015100191A1 (en) Sealing material
US6716377B1 (en) Use of plastic foams containing swellable fillers for sealing wall channels
JP5702602B2 (en) Rubber-based resin closed cell foam sheet and method for producing the same
US20160176160A1 (en) Release sheet and release sheet-including silicone resin sheet
JP2003137611A (en) Glass frame sealing structure and sealing method
JP2009054983A (en) Radio wave absorber and manufacturing method thereof
JP4115567B2 (en) Electromagnetic shielding gasket
JP2010031137A (en) Closed cell foam sheet
JP2010199538A (en) Water cut-off tape for solar cell module
JP2014216634A (en) Water cut-off tape for solar cell module
JP2015153977A (en) Seal material for solar cell and laminated seal material for solar cell
TW202104488A (en) Carrier film for electronic component and production method for carrier film
JP2010177356A (en) Waterproof tape for solar battery modules
JP2000109627A (en) Polyvinyl chloride resin composition and sponge-like foam made of polyvinyl chloride resin
KR20190061555A (en) Adhesive tape with excellent impact resistance and resilience
JP2000256496A (en) Definite form elastic formed sealing material
JP2001132842A (en) Connection structure of sealing material
JP2000169807A (en) Foam with adhesive layer

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14873127

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14873127

Country of ref document: EP

Kind code of ref document: A1