WO2007072885A1 - 独立気泡発泡ゴムシート、積層体及びそれらを用いた止水・水密シール材 - Google Patents
独立気泡発泡ゴムシート、積層体及びそれらを用いた止水・水密シール材 Download PDFInfo
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- WO2007072885A1 WO2007072885A1 PCT/JP2006/325427 JP2006325427W WO2007072885A1 WO 2007072885 A1 WO2007072885 A1 WO 2007072885A1 JP 2006325427 W JP2006325427 W JP 2006325427W WO 2007072885 A1 WO2007072885 A1 WO 2007072885A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- 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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/024—Preparation or use of a blowing agent concentrate, i.e. masterbatch in a foamable composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/06—Copolymers with styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2311/00—Characterised by the use of homopolymers or copolymers of chloroprene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08J2323/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08J2323/22—Copolymers of isobutene; butyl rubber
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0607—Rubber or rubber derivatives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249976—Voids specified as closed
- Y10T428/249977—Specified thickness of void-containing component [absolute or relative], numerical cell dimension or density
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
Definitions
- the present invention relates to a closed-cell foamed rubber sheet, a laminate, and a water-stopping / watertight seal material using the same, and more specifically, a foaming raw material composition containing rubber-based resin as a main component is subjected to a crosslinking treatment and Closed-cell foamed rubber sheet obtained by foaming treatment, which can be suitably used for various sealing materials in the fields of architecture, civil engineering, electricity, electronics, vehicles, etc., laminates, and water / watertightness using them It relates to a sealing material.
- foams are widely used as sealing materials in various fields such as architecture, civil engineering, electricity, electronics, vehicles and the like.
- the foam used for such a sealing material include a thermoplastic resin foam having a strength such as a polyethylene-based resin and a polypropylene-based resin, and a rubber foam having a synthetic rubber or a natural rubber power. .
- water-stop / water-tight seal materials are used to fill gaps in various structures such as vehicles, buildings, civil engineering, and light electricity, and prevent water from entering.
- a foam-like sealant is installed in a compressed state at the periphery, and the repulsive stress closes the gap with the interface to prevent water from entering. Yes.
- the foam which is a sealing material
- the member to be sealed is deformed due to the repulsive force of the foam to recover its shape from the compressed state, or the member to be sealed is deformed. If the gap in the sealed part is enlarged, there is a problem. As a result, the sealing performance is inferior and the water cannot be stopped.
- a foam structure having both closed cells and open cells can be expected to have both ease of filling a complex gap due to easy deformation based on open cells and water-stopping based on closed cells. Therefore, it is considered to be suitable as a fixed water sealing material that fills complex gaps.
- a foam structure having both closed and open cells is made to have a water-swelling property.
- a fixed seal material characterized in that the number of bubbles per lcm of length is 8 or more see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 09-111899
- the object of the present invention is a foamed structure having closed cells, and the force is used for a long time, for example, when used as a water sealing material.
- the inventors of the present invention can be obtained by subjecting a foamable raw material composition mainly composed of a rubber-based resin to a crosslinking treatment and a foaming treatment.
- a foamable raw material composition mainly composed of a rubber-based resin
- a crosslinking treatment and a foaming treatment By making the apparent density and compression set of the closed-cell foamed rubber sheet within a specific range, when used as a still water sealing material, it has low repulsion (low compressive stress), but it is covered for a long time. It has been found that it has excellent interfacial adhesion with a seal member (a structural member to be water-stopped) and is excellent in water-stopping properties, and further studies have been made to complete the present invention.
- the closed-cell foamed rubber sheet of the present invention is obtained by subjecting a foamable raw material composition containing a rubber-based resin as a main component to a crosslinking treatment and a foaming treatment, and is a method based on JIS K7222.
- the apparent density measured in step 30 is: LOOkgZm 3 and the compression set measured under conditions of 70 ° C and 24 hours according to JIS K6262 is 60% or less.
- a water-stop / water-tight seal material composed of the closed-cell foam rubber sheet, It has excellent interfacial adhesion to the structural member, and has the effect of being excellent in water-stopping properties over a long period of time and improving reliability, and can provide an excellent water-stopping and water-tight sealing material.
- the crosslinking treatment is physical crosslinking by ionizing radiation or chemical crosslinking by an organic peroxide or sulfur compound.
- the crosslinking treatment is specified. There is an effect that the rubber sheet can be easily manufactured.
- the rubber-based resin is nitrile monobutadiene rubber (NBR), styrene monobutadiene copolymer rubber (SBR), butyl rubber (IIR), or chloroprene rubber (CR), It has the effect of further improving the adhesion with the structural member that is the target of water and improving the water stoppage.
- NBR nitrile monobutadiene rubber
- SBR styrene monobutadiene copolymer rubber
- IIR butyl rubber
- CR chloroprene rubber
- the foamable raw material composition includes a crystalline resin having a melting point of 25 ° C or higher or a high soft point resin having a soft point of 25 ° C or higher.
- the crystalline region of the crystalline resin and the glass region of the high soft point resin are not shrunk and have a high elastic modulus and are not easily deformed.
- the resin layer is formed before foaming of the foamable raw material composition or!
- the timing of forming the resin layer is specified. There is an effect that it can be reduced.
- the laminate has an acrylic or rubber-based pressure-sensitive adhesive layer, when used as a water / watertight seal material, the water / watertight seal material and the structural member to be water-stopped Excellent interfacial adhesion and improved water tightness!
- the pressure-sensitive adhesive layer is a polyurethane-based pressure-sensitive adhesive obtained by reacting a raw material containing a polyol and a polyisocyanate, adhesion and removability are imparted. This has the effect of achieving both waterstop and workability.
- the foamed layer when the foamed layer is laminated and integrated on one or both sides of the closed cell foamed rubber sheet or the laminated body, the bending rigidity of the laminated body is increased, and the handleability is improved. If you can! [0026]
- the closed-cell foamed rubber sheet or laminate When the closed-cell foamed rubber sheet or laminate is used as a water-stopping / water-tight sealing material, it has excellent interfacial adhesion with a structural member to be water-stopped, and has excellent water-stopping properties over a long period of time. There is an effect that reliability can be improved.
- a high-performance closed-cell foamed rubber sheet, a laminate, and a laminate that can be suitably used for various sealing materials in the fields of architecture, civil engineering, electricity, electronics, vehicles, etc. Can provide water-stop / water-tight seals using them.
- the closed-cell foamed rubber sheet of the present invention is obtained by subjecting a foamable raw material composition containing rubber-based resin as a main component to crosslinking treatment and foaming treatment, and is measured by a method based on JIS K7222. Density is 30 ⁇ : It is characterized in that the compression set measured under the conditions of LOOkgZm 3 and JIS K6262 at 70 ° C for 24 hours is 60% or less.
- the closed-cell foamed rubber sheet of the present invention (hereinafter also referred to as “foamed rubber sheet”) is obtained by subjecting a foamable raw material composition mainly composed of a rubber-based resin to a crosslinking treatment and a foaming treatment. It is possible to have both open cells and closed cells as long as they have closed cells.
- the closed cell ratio of the foamed rubber sheet is preferably as high as possible from the viewpoint of water-stopping, and is preferably 80 to 100% or more, and more preferably 85 to 100%.
- the closed cell ratio of foamed rubber sheet is measured as follows.
- test piece having a flat square shape with a side of 5 cm and a constant thickness is cut out from a closed-cell foamed rubber sheet. Then, measure the thickness of the specimen and calculate the apparent volume V of the specimen.
- the density of the resin is lg / cm 3 .
- test piece was submerged in distilled water at 23 ° C to a depth of 100 mm from the water surface. Increase the pressure of 15 kPa for 3 minutes. Then, remove the water from the test piece, remove the water adhering to the surface of the test piece, and measure the weight W of the test piece.
- Open cell ratio F (%) 100 X (W-W) / V
- the closed cell foam rubber sheet has an apparent density force of 30 to: LOOkg / m 3 measured by a method according to JIS K7222 and 70 by a method according to JIS K6262.
- C compression set measured under conditions of 24 hours is required to be 60% or less.
- the compression set (70 ° C, 24h) of the closed-cell foamed rubber sheet exceeds 60%, the foamed rubber sheet is inferior in shape recoverability, and used as a water-stopping / watertight sealant. In some cases, it is impossible to maintain water-stopping properties for a long period of time.
- the compression set (70 ° C, 24h) of the closed-cell foamed rubber sheet is preferably as small as possible. However, those with 55% or less are excellent in shape recovery and are preferably 5 to 55%. 5-45% is particularly preferred.
- the foamed rubber sheet of the present invention preferably has a 50% compression stress of 60 kPa or less as measured by a method according to JIS K6767.
- the lower limit of the 50% compressive stress is not particularly limited, but when used as a water / watertight sealing material, it is preferably 1 OkPa or more because it is possible to further increase the water stop. Also, if the 50% compressive stress exceeds 60 kPa, the flexibility is insufficient and the shape of the sealed part cannot be sufficiently followed, and a gap is formed between the sealed part and poor water stoppage. Cause.
- the foamed rubber sheet of the present invention preferably has a 50% compressive stress of 60 kPa or less (and lOkPa or more), and has excellent water-stopping properties while being low in resilience. Can provide watertight sealant.
- the closed-cell foamed rubber sheet of the present invention can be obtained by subjecting a foamable raw material composition containing a resin mainly composed of a rubber-based resin to a crosslinking treatment and a foaming treatment. It is possible to adopt a publicly known method.
- a foamable raw material composition in which a filler or the like is added to a rubber-based resin, a cross-linking agent, and a pyrolytic foaming agent, if necessary, Kneading with a kneading machine such as a calender, extruder, conveyor belt casting, etc.
- a foamable raw material composition comprising a rubber-based resin, a bridging agent and a thermally decomposable foaming agent, where necessary, a filler or the like is added Kneading with a mixing roll, etc., and supplying the kneaded composition to a mold and crosslinking and foaming at the same time as molding to produce a closed-cell foamed rubber sheet, (3) Rubber-based resin and pyrolytic foam If necessary, add filler etc.
- the foamable raw material composition is kneaded with a kneader such as a Banbury mixer or a pressure-solder, it is continuously kneaded with a calendar, an extruder, a conveyor belt casting, etc. to produce a foamable sheet,
- the foamable raw material composition in which a filler or the like is added to the pyrolytic foaming agent as necessary, is kneaded with a kneader such as a Banbury mixer or a pressure-solder, and then calendered, extruded
- a foamable sheet is manufactured by continuously kneading by a machine, conveyor belt casting, etc., and after this uncrosslinked foamable sheet is heated and foamed to produce a foamed molded
- a foamable raw material composition to which a filler or the like is added according to After kneading with any kneader, it is continuously kneaded by a calendar, an extruder, a conveyor belt casting, etc. to produce a foamable sheet, and this foamable sheet is irradiated with ionizing radiation to crosslink the foamable sheet. And a method of producing a closed-cell foamed rubber sheet by heating and foaming a foamable sheet and then crosslinking with a crosslinking agent. It should be noted that the rubber-based resin may be contained in the foamable raw material composition in an amount of 50% by weight or more.
- Examples of the crosslinking agent include organic peroxides, sulfur, sulfur compounds and the like, and organic peroxides are preferable.
- Examples of ionizing radiation include light, ⁇ -rays, and electron beams.
- Examples of the organic peroxide include diisopropylbenzene hydroberoxide, 2,4 dichroic benzoyl peroxide, benzoyl peroxide, tert-chinole perbenzoate, tamil hydride oral peroxide, tert hydride oral peroxide, 1, 1 di (t-butylperoxy) -3,3,5 trimethylhexane, n-butyl 4,4-di (t butylperoxy) valerate, a, ⁇ ′ bis (t butylperoxypropyl) benzene, 2,5 dimethyl-2,5 di (t-butylperoxy) hexyne 3, t-butylperoxycumene and the like.
- sulfur compound examples include tetramethylthiuram disulfide, tetramethylthiuram mono Sulfide, zinc dimethyldithiocarnomate, 2-mercaptobenzothiazole, dibenzothi Jirujisurufuido, N- cyclohexyl 2-benzothiazole sulfenamide, N- t-butyl 2-benzothiazole sulfenamide, sulfur monochloride, and the like disalt I ⁇ yellow.
- the physical crosslinking by the ionizing radiation irradiation and the chemical crosslinking by the crosslinking agent may be used in combination.
- a foamable raw material composition such as a rubber-based resin, a crosslinking agent and a thermally decomposable foaming agent, a filler added as necessary, a stabilizer, etc. with a kneader
- a foamable sheet is produced by continuously kneading with an extruder or the like, and this uncrosslinked foamable sheet is irradiated with ionizing radiation to crosslink, and after the foamable sheet is heated and foamed, further with a crosslinking agent.
- a closed-cell foamed rubber sheet can be produced by crosslinking.
- a crosslinking agent having a one-minute half-life temperature higher than the decomposition temperature of the pyrolytic foaming agent By using a pyrolytic foaming agent and a crosslinking agent under the above conditions, crosslinking can be performed after foam molding, and a foam rubber sheet having high dimensional stability is obtained. In addition, a foam with a high magnification and a high degree of crosslinking can be obtained.
- the decomposition temperature of the pyrolytic foaming agent is the temperature at which the pyrolytic foaming agent begins to rapidly decompose. Specifically, it is measured under the condition of a temperature increase rate of 1 ° CZ by thermogravimetric analysis (TG). Measure the temperature at which the weight is reduced by 50% by weight.
- the content of the crosslinking agent in the foamable raw material composition may be appropriately adjusted depending on the properties of the rubber-based resin and the use of the closed cell foamed rubber sheet. Specifically, when the crosslinking treatment of the foamable raw material composition is performed only with the crosslinking agent, if the content of the crosslinking agent in the foamable raw material composition is small, the gel content of the foamable raw material composition is reduced. If the rate (crosslinking degree) is not suitable for foaming and breaks, it may not be possible to obtain a closed-cell foamed rubber sheet.
- the foaming raw material composition may not foam due to an excessive increase in the rate (crosslinking degree), so 0.1 to 10 parts by weight is preferred with respect to 100 parts by weight of the rubber-based resin 0.2 to 7 parts by weight is more preferred.
- the 1-minute half-life temperature of the crosslinking agent is higher than the decomposition temperature of the pyrolytic foaming agent.
- the content is high, if the content of the crosslinking agent in the foamable raw material composition is small, the effect of adding the crosslinking agent does not appear, whereas if it is large, the resulting closed-cell foamed rubber sheet becomes hard and the compression flexibility Therefore, it is preferable to add 0.05 to L0 parts by weight with respect to 100 parts by weight of the rubber-based resin. 0.1 to 5 parts by weight is more preferable.
- the 1 minute half-life temperature of the crosslinking agent is higher than the decomposition temperature of the pyrolytic foaming agent.
- the content is low, if the content of the crosslinking agent in the foamable raw material composition is small, the gel fraction (crosslinking degree) of the foamable raw material composition is not suitable for foaming and bubbles are broken. On the other hand, it may not be possible to obtain an independent foamed foam rubber sheet. On the other hand, if the amount is too large, the gel fraction (crosslinking degree) of the foamable raw material composition will increase so much that the foamable raw material composition may not foam. 0.05 to 5 parts by weight is preferable with respect to 100 parts by weight of the rubber-based resin.
- the content of the pyrolytic foaming agent in the foamable raw material composition is small! ⁇ and the closed cell foamed rubber sheet may increase the apparent density without increasing the expansion ratio, and the repulsive force of the closed cell foamed rubber sheet may increase.
- the closed-cell foamed rubber sheet is used as a water-tight / watertight seal material, the apparent density of the foam becomes low, the compression set increases, the shape recovery of the closed-cell foamed rubber sheet decreases, and it takes a long time. Therefore, it may not be possible to maintain water-stopping properties.
- 3 to 20 parts by weight is preferable with respect to 100 parts by weight, and 5 to 15 parts by weight is more preferable.
- the irradiation dose of ionizing radiation may be appropriately adjusted according to the characteristics of the rubber-based resin and the use of the closed-cell foamed rubber sheet, and is 0.5 to: LOMrad force S, preferably 0.7. ⁇ 5. OMr ad is more preferred.
- the gel fraction of the foamed rubber sheet is preferably 40 to 95 weight 0/0. More preferably, it is 60 to 85% by weight. If the gel fraction is low, the compression set becomes large. On the other hand, if the gel fraction is too high, the compression flexibility is lowered.
- the rubber-based resin according to the present invention is not particularly limited as long as it has rubber elasticity at room temperature.
- chloroprene rubber (CR) chloroprene rubber (CR), isoprene rubber (IR), butyl rubber ( IIR), nitrile rubber (nitrile-butadiene rubber) (NBR), natural rubber, styrene butadiene copolymer rubber (SBR), butadiene rubber (BR), urethane rubber, fluorine rubber, acrylic rubber, and silicone rubber.
- nitrile-butadiene rubber (NBR), styrene-butadiene copolymer rubber (SBR), butyl rubber (IIR), and chloroprene rubber (CR) force is listed, among which nitrile-butadiene rubber (NBR), styrene-butadiene copolymer rubber (SBR), butyl rubber (IIR), and chloroprene rubber (CR) force.
- Nitrile butadiene rubber is also called nitrile rubber or acrylonitrile-butadiene copolymer rubber
- SBR styrene-butadiene copolymer rubber
- a foamable raw material composition containing rubber-based resin as a main component is added with crystalline resin or high It is also possible to blend soft coconut oil.
- the melting point of the crystalline resin and the soft soft point of the high soft point resin are low, and the dimensional stability of the closed cell foam rubber sheet may not be improved. More than ° C is preferred 50-200 o C force S is preferred! / ⁇ .
- the melting point of crystalline rosin is measured according to JIS K7121 and is high soft.
- the soft spot of chemical conversion point resin means that measured according to JIS K2207.
- Crystalline resin includes polyethylene resin, polypropylene resin such as polypropylene resin, ethylene vinyl acetate copolymer, polyvinyl acetate, ethylene vinyl chloride copolymer, poly Vinyl chloride, polyvinyl chloride, polyvinylidene power It is preferably at least one resin selected.
- the polyethylene-based resin is not particularly limited, and for example, ethylene a-olefin copolymer, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, linear medium density. Examples thereof include polyethylene and linear high-density polyethylene, which may be used alone or in combination.
- ⁇ -olefin include ⁇ -olefin including propylene, 1-butene, 1-pentene, 4-methyl 1-pentene, 1-hexene, 1-octene, 1 nonene, 1-decene, and the like. It is done.
- the polypropylene-based resin is not particularly limited, and examples thereof include a propylene homopolymer and a propylene-a-olefin copolymer.
- the propylene-a-olefin copolymer may be any of a block copolymer, a random copolymer, and a random block copolymer.
- Examples of a-olefin include olefins such as ethylene, 1-butene, 1-pentene, 4-methyl 1-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene, and the like.
- examples of the high soft point resin include rosin-based resin, terpene-based resin, petroleum resin, and the like. Is preferred.
- the crystalline region of the crystalline resin is inserted between the molecular chains of the rubber-based resin.
- the shrinkage of the rubber-based resin can be suppressed by entering the glass region of the high softening point resin. Therefore, when the independent foamed rubber sheet is used as a water-stop / water-tight seal material, it is possible to improve the adhesion with the structural member to be water-stopped and to improve the water-stop.
- the blending amount of the crystalline or high softening point resin in the foamable raw material composition may not be able to prevent shrinkage of the closed-cell foamed rubber sheet, while being small, Since the flexibility of the obtained closed cell foamed rubber sheet may be insufficient, 1 to 50 parts by weight is preferable with respect to 100 parts by weight of the rubber-based resin, and 5 to 30 parts by weight is more preferable.
- the foamable raw material composition has a vulcanization accelerator, a vulcanization acceleration aid, a vulcanization retarder, a softening agent, a filler, an anti-aging agent for the purpose of adjusting the physical properties of the closed-cell foamed rubber sheet. Agents, antioxidants, pigments, colorants, fungicides, foaming aids, flame retardants, flame retardant aids, etc. may be added.
- Examples of the vulcanization accelerator include aldehyde ammonias, aldehyde amines, guanidines, thiazoles, sulfenamides, turums, dithiocarnomic acids, xanthogenic acids, and thioureas.
- Examples of the vulcanization acceleration aid include zinc oxide, zinc carbonate, magnesium oxide, red lead, calcium hydroxide, stearic acid, zinc stearate, amines, diethylene glycol and the like.
- examples of the vulcanization retarder include phthalic anhydride, organic acids such as benzoic acid and salicylic acid, and amines such as N--troso-diphenylamine and N--troso-diphenyl-13-naphthylamine. Is mentioned.
- acrylic polymers such as poly (meth) acrylic acid alkyl esters and polychlorinated vinyl can be added to adjust the viscosity and gel fraction of the foamable raw material composition.
- a softener to the foamable raw material composition containing rubber-based resin as a main component in order to improve the moldability and dimensional stability of the closed-cell foamed rubber sheet.
- the softening agent By blending the softening agent, the closed-cell foamed rubber sheet can be softened, and the distortion generated in the closed-cell foamed rubber sheet can be smoothly alleviated, thereby improving the dimensional stability of the closed-cell foamed rubber sheet.
- the softener to be blended may be a conventionally known softener, but the blending amount of the softener that is preferably compatible with rosin is 1 to 50 parts by weight with respect to 100 parts by weight of the rubber-based greaves. 15 to 30 parts by weight is more preferable from the viewpoint of securing the preferred foaming property and reducing the shrinkage force.
- Examples of the softening agent include, for example, araffins such as chlorinated paraffin and liquid paraffin, waxes, animal and vegetable oils such as flax oil, petroleum oil, process oil, lubricating oil, and petroleum asphalt.
- Petroleum softeners such as petroleum jelly, coal tar softeners such as coal tar and coal tar pitch, fatty oil softeners such as castor oil, linseed oil, rapeseed oil and coconut oil, tall oil, sub-oil, honey Waxes such as wax, carnauba wax, lanolin, ricinoleic acid, Fatty acids such as luminic acid and stearic acid, fatty acid esters such as phthalic acid ester, fatty acid salts such as barium stearate, calcium stearate, and zinc lanolinate, phosphoric acid esters, alkyl sulfonic acid esters, tackifiers, etc. It is done.
- Examples of the filler include talc, calcium carbonate, bentonite, carbon black, fumed silica, aluminum silicate, acetylene black, and aluminum powder.
- flame retardant for example, in addition to metal hydroxides such as hydroxide-aluminum and hydroxide-magnesium, bromine-based flame retardants such as deca-buck mouth diphenyl ether, polyphosphate ammonium -Phosphorus flame retardants such as um.
- flame retardant aids include, for example, antimony trioxide, antimony tetraoxide, antimony pentoxide, sodium pyroantimonate, antimony trichloride, antimony trisulfide, antimony oxychloride, antimony dichloride, perchloropentane, and potassium antimonate.
- the foaming treatment method used in the present invention includes publicly known methods including those described in Plastic Foam Handbook (published by Makihiro, Atsushi Kosaka, published by Nikkan Kogyo Shimbun, 1973). V, you can use the shift method!
- the thermally decomposable foaming agent is one that decomposes by heating to generate a foaming gas!
- a thermally decomposable foaming agent is not particularly limited, and examples thereof include azodicarbonamide, Examples thereof include benzenesulfol hydrazide, dinitrosopentamethylenetetramine, toluenesulfur hydrazide, and 4,4 oxybis (benzenesulfol hydrazide).
- These pyrolytic foaming agents may be used alone or in combination of two or more.
- the blending amount of the pyrolytic foaming agent in the foamable raw material composition is preferably 1 to 30 parts by weight per 100 parts by weight of the rubber-based resin! /.
- the closed-cell foamed rubber expansion ratio of the sheet of the present invention is particularly limited 30 the apparent density of nag: To a LOOkgZm 3, for example, the expansion ratio of about 10 times or more.
- the thickness of the closed-cell foamed rubber sheet is not particularly limited, but is generally in the range of 1 to 20 mm, and preferably in the range of 3 to 5 mm, for use in water-stopping / watertight seal materials. It is better.
- the laminate of the present invention comprises the above-mentioned closed-cell foamed rubber sheet and a foamable raw material composition that is laminated and integrated on one or both sides of this closed-cell foamed rubber sheet and serves as a raw material for the above-mentioned closed-cell foamd rubber sheet And a resin layer having a melting point or soft point lower than the temperature at the time of foaming.
- the effects of having a resin layer on one or both surfaces of the above closed-cell foamed rubber sheet include the following.
- the closed-cell foamed rubber sheet mainly composed of rubber-based resin has a rubber-derived tackiness, so when foamed rubber sheets are laminated or rolled up in a roll shape during production.
- the foamed rubber sheet may be blocked, making it difficult to separate the foamed rubber sheets.
- a foamed rubber sheet having a slightly adhesive surface is preferred in order to improve the adhesion at the interface between the sealed portion and the foamed rubber sheet. For this reason, the foamed rubber sheet is more easily blocked.
- a material having no adhesiveness on one side or both sides of the closed-cell foamed rubber sheet that is, a non-foamed resin layer is laminated and integrated. It is possible to prevent blocking when the foamed rubber sheet is laminated or rolled up.
- the resin layer used in the present invention is lower than the temperature at the time of foaming of the foamable raw material composition which is the raw fabric of the closed cell foamed rubber sheet, and has a melting point or soft point.
- the film is not particularly limited, and examples thereof include films having polyolefin-based repellency such as low-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, and ethylene acetate butyl copolymer. These rosins may be used alone or in combination of two or more.
- the melting point of the resin constituting the resin layer is measured according to JIS K7121.
- the soft spot of the resin constituting the resin layer is measured according to JIS K2207.
- the resin having a melting point or soft softness point lower than the temperature at the time of foaming is not particularly limited. As will be described later, it is preferable that the foaming material is spread together with the foamable raw material composition at the time of foaming. Therefore, it is necessary to extend at the timing of foaming. From this point of view, a polyolefin resin having a melting point of 170 ° C. or lower is preferred, and a polyethylene resin having a melting point of 130 ° C. or lower is more preferable. Further, high-density polyethylene with high tensile strength is most preferable because it does not stretch in the flow direction due to the tension applied to the sheet. Further, the thickness of the resin layer is preferably 5 to 100 / ⁇ ⁇ .
- the closed cell foamed rubber sheet of one laminate is prepared.
- the peel strength measured by a method in accordance with JIS 6854-2 is preferably 50NZ25mm or less, more preferably 20NZ25mm or less, by superposing the resin layer of the other laminate on top.
- a film constituting the resin layer is produced by a conventionally known method, and this film is formed.
- a laminate sheet is produced by laminating on one or both sides of a foamable sheet made of a foamable raw material composition, and the laminate sheet is heated to perform crosslinking treatment and foaming treatment of the foamable sheet.
- a method of producing a laminate by forming a closed cell foamed rubber sheet and simultaneously laminating a resin layer on one or both sides of the closed cell foamed rubber sheet.
- the film constituting the resin layer it can be produced by, for example, extrusion molding by the T-die method or inflation method, calendar molding, solution casting method, or the like.
- a foam layer different from the closed-cell foamed rubber sheet is laminated and integrated on one side or both sides of the closed-cell foamed rubber sheet or on one side or both sides of the laminated body to obtain a laminate. It may be configured. Examples of such a foam layer include, but are not limited to, a polyolefin resin foam foam sheet, a rubber resin foam foam sheet, a polyurethane resin foam sheet, a polyolefin resin foam foam sheet and rubber. A systemic resin foam sheet is preferred.
- the polyolefin-based resin is the same as the polyolefin-based resin constituting the above-described resin layer, and therefore the description thereof is omitted.
- the closed cell ratio of the polyolefin-based resin foam sheet is preferably 80% or more.
- the method for measuring the independent cell rate of the polyolefin foamed resin sheet is the same as the method for measuring the closed cell rate of the closed cell foamed rubber sheet, and is therefore omitted.
- the foam sheet constituting the foam layer may be either a closed-cell foam sheet or an open-cell foam sheet, but from the viewpoint of ensuring watertightness, the closed-cell foam sheet is used. preferable.
- the apparent density of the foam sheet constituting the foam layer is 20 to: LOOkg / m 3 is preferred, and 22 to 70 kg / m 3 is more preferred from the viewpoint that both compression flexibility and handleability can be achieved. That's right.
- the foamed layer contains conventionally known additives such as antioxidants, fillers, stabilizers, ultraviolet absorbers, pigments, antistatic agents, plasticizers, flame retardants, and flame retardant aids. May be.
- An adhesive layer can also be provided on one or both surfaces of the closed-cell foamed rubber sheet, or on one or both surfaces of the laminate.
- the laminate was laminated and integrated on one or both sides of the closed cell foamed rubber sheet and the closed cell foamed rubber sheet.
- the pressure-sensitive adhesive layer is laminated and integrated on the surface of the outermost layer of the closed cell foam rubber sheet or the resin layer constituting the laminate.
- the laminate comprises an independent cell foam rubber sheet, a resin layer laminated on one or both sides of the closed cell foam rubber sheet, and one surface of the closed cell foam rubber sheet or the resin layer.
- the closed cell foam rubber sheet, the resin layer, or the outermost layer of the foam layer is laminated and integrated.
- the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited.
- a polyurethane-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, or a rubber-based pressure-sensitive adhesive can be used. It is desirable to use a polyurethane-based pressure-sensitive adhesive from the viewpoint of removability and high water-stopping properties and workability.
- the polyurethane-based pressure-sensitive adhesive is obtained by reacting a raw material containing a polyol and a polyisocyanate.
- the polyol include polyester polyol and polyether polyol.
- the polyester polyol is obtained by reacting a polyvalent carboxylic acid component and a polyol component.
- a polyvalent carboxylic acid component include terephthalic acid, adipic acid, azelaic acid, sebacic acid, phthalic anhydride, isophthalic acid, trimellitic acid, and the like.
- polystyrene resin ethylene glycol, propylene glycol, polyethylene glycol, butylene glycol, 1,6 hexene glycol, 3-methyl-1,5-pentanediol, 3,3'-dimethylol heptane, Polyoxyethylene glycol, polyoxypropylene glycol, 1,4 butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol, others And polyester polyols obtained by ring-opening polymerization of latatones such as polyvalerolatatanes.
- the polyether polyol can be obtained by polymerizing an oxysilane compound using a low molecular weight polyol as an initiator.
- the oxysilane compound include ethylene oxide, propylene oxide, butylene oxide, and tetravidrofuran.
- the low molecular weight polyol include propylene glycol, e.g. Tylene glycol, glycerin, trimethylolpropane and the like can be mentioned.
- the polyisocyanates are classified into aromatic polyisocyanates, aliphatic polyisocyanates, araliphatic polyisocyanates, and alicyclic polyisocyanates.
- aromatic polyisocyanate examples include 1,3 phenolic diisocyanate, 4,4'-diphenyl diisocyanate, 1,4 phenolic diisocyanate, 4,4, -diphenol.
- aliphatic polyisocyanate examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, and 1,2 propylene diisocyanate. Isocyanate, 2,3 butylene diisocyanate, 1,3 butylene diisocyanate, dodecamethylene diisocyanate, 2,4,4 trimethylhexamethylene diisocyanate and the like.
- Examples of the araliphatic polyisocyanate include ⁇ , ⁇ '-diisocyanate 1,3 dimethylbenzene, ⁇ , ⁇ , diisocyanato 1,4-dimethylbenzene, ⁇ , ⁇ Examples include '-diisocyanate 1,4-jetylbenzene, 1,4-tetramethylxylylene diisocyanate, 1,3-tetramethylxylylene diisocyanate, and the like.
- the alicyclic polyisocyanates include 3 isocyanatomethyl-3,5,5 trimethylcyclohexyl isocyanate, 1,3 cyclopentane diisocyanate, 1,3 cyclohexanone.
- the closed-cell foamed rubber sheet or laminate of the present invention can be suitably used for various sealing materials in the fields of architecture, civil engineering, electricity, electronics, vehicles and the like.
- it has excellent interfacial adhesion with structural members that are subject to water-stopping, excellent water-stopping properties over a long period of time, and can improve reliability.
- It can be suitably used as the lumber material.
- the obtained foamable sheet was irradiated with an electron beam with a dose of 2 Mrad and an acceleration voltage of 500 keV to obtain a crosslinked and unfoamed foamable sheet.
- an electron beam with a dose of 2 Mrad and an acceleration voltage of 500 keV to obtain a crosslinked and unfoamed foamable sheet.
- the azodicarbonamide is decomposed to foam the foamable sheet, resulting in an apparent density of 35 kgZm 3 and a thickness of 2
- a 5 mm closed cell foam rubber sheet was obtained.
- a closed-cell foamed rubber sheet having an apparent density of 56 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Example 1 except that the amount of azodicarbonamide was changed to 10 parts by weight.
- a closed cell foamed rubber sheet having an apparent density of 85 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Example 1 except that the amount of azodicarbonamide was changed to 6 parts by weight.
- Example 1 Except for adding 0.5 parts by weight of the crosslinking agent diisopropylbenzene hydroperoxide (trade name “Park Mill P” manufactured by Nippon Oil & Fats Co., Ltd., 1 minute half-life temperature: 230 ° C.) to the formulation of Example 1.
- a closed cell foamed rubber sheet having an apparent density of 35 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Example 1.
- Example 5 Except that the blending amount of diisopropylbenzene hydroperoxide (Nippon Yushi Co., Ltd., trade name “Park Mill P”, 1 minute half-life temperature: 230 ° C.) was 1.0 part by weight, A closed-cell foamed rubber sheet having an apparent density of 35 kgZm 3 and a thickness of 2.5 mm was obtained.
- diisopropylbenzene hydroperoxide Nippon Yushi Co., Ltd., trade name “Park Mill P”, 1 minute half-life temperature: 230 ° C.
- Example 2 An independent foamed foam rubber with an apparent density of 35 kgZm 3 and a thickness of 2.5 mm in the same manner as in Example 1 except that 15 parts by weight of 2-ethylhexyl phthalate (manufactured by Wako Pure Chemical Industries) was blended as a softening agent. A sheet was obtained.
- 2-ethylhexyl phthalate manufactured by Wako Pure Chemical Industries
- Example 2 The same as Example 1, except that 10 parts by weight of terpene resin (trade name “Clear Open P125”, manufactured by Yashara Chemicals, soft temperature: 125 ° C) manufactured by Yashara Chemicals is blended as an additive.
- terpene resin trade name “Clear Open P125”, manufactured by Yashara Chemicals, soft temperature: 125 ° C
- Yashara Chemicals a closed-cell foamed rubber sheet having an apparent density of 35 kgZm 3 and a thickness of 2.5 mm was obtained.
- a polyurethane-based pressure-sensitive adhesive (trade name “Sirebine SP-205” manufactured by Toyo Ink Co., Ltd.) was applied to a thickness of 20 m. A laminate in which the pressure-sensitive adhesive layer was laminated and integrated on one side of the closed-cell foamed rubber sheet was obtained.
- Example 2 On one side of the closed cell foam rubber sheet obtained in Example 1, an acrylic adhesive (trade name “BPS3180” manufactured by Toyo Ink Manufacturing Co., Ltd.) was applied to a thickness of 20 m, and closed cell foam was used. A laminated body in which the pressure-sensitive adhesive layer was laminated and integrated on one side of the rubber sheet was obtained.
- BPS3180 acrylic adhesive
- the blending amount of azodicarbonamide was 10 parts by weight, and when extruding the foamable sheet, a high-density polyethylene film with a thickness of 40 ⁇ m as the resin layer (trade name “HD”, manufactured by Tamapoly Co., Ltd., melting point: 134 ° An isolated cellular foamed rubber sheet having an apparent density of 56 kgZm 3 and a thickness of 2.5 mm, in the same manner as in Example 1, except that C) was extruded and laminated on one side of the uncrosslinked and unfoamed foam sheet. The laminated body containing was obtained. Blocking after winding the closed-cell foamed rubber sheet into a roll was ineffective. The peel strength of the resin layer of the laminate is 10N / 25 mm.
- a double-sided tape (trade name “# 5761” manufactured by Sekisui Chemical Co., Ltd.) was applied on the resin layer of the laminate and used in the state where the release paper was peeled off.
- Polyethylene foam sheet on one side of the closed cell foam rubber sheet obtained in Example 1 (trade name “Softlon FR—ND # 3001” manufactured by Sekisui Chemical Co., Ltd., closed cell rate: 92%, apparent density: 33 kgZm 3 ) was laminated and integrated by an adhesive laminating method to obtain a laminated body having a thickness of 3.5 mm.
- a closed cell foam rubber sheet having an apparent density of 35 kgZm 3 and a thickness of 3.5 mm was obtained in the same manner as in Example 1 except that the thickness of the obtained closed cell foam rubber sheet was adjusted to 3.5 mm. .
- a closed-cell foamed rubber sheet having an apparent density of 25 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Example 1 except that the amount of azodicarbonamide was changed to 20 parts by weight.
- a closed cell foamed rubber sheet having an apparent density of 110 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Example 1 except that the amount of azodicarbonamide was changed to 4 parts by weight.
- the apparent density was obtained in the same manner as in Example 1 except that 100 parts by weight of ethylene-propylene copolymer rubber (EPDM: density 0.87 g / cm 3 ) as the main raw material and 10 parts by weight of azodicarbonamide were added. 40kgZm 3 , 2.5mm thick closed cell foam rubber sheet was obtained
- a closed cell foamed rubber sheet having an apparent density of 67 kgZm 3 and a thickness of 2.5 mm was obtained in the same manner as in Comparative Example 3, except that the amount of azodicarbonamide was changed to 6 parts by weight.
- the blending amount of azodicarbonamide was 10 parts by weight, and when extruding the foamable sheet, a polyethylene terephthalate film with a thickness of 50 ⁇ m as the resin layer (trade name “E5000” manufactured by Toyobo Co., Ltd., softening point: 260 ° C) except that the laminate was extruded and laminated on one side of the uncrosslinked and unfoamed foam sheet. A laminate could not be obtained due to the spread of force during foaming.
- the gel fraction of the closed-cell foamed rubber sheet was measured as follows. Foam rubber sheet 1 OOmg of 70 ° C (Comparative Examples 3-5 is 110 ° C xylene) ethylmethylketone in 25 ml for 7 to 22 hours. The residue on the wire mesh was vacuum-dried and the weight A (mg) of the dry residue was measured, and calculated according to the following formula.
- One of the two acrylic resin plates has a through hole for water filling and pressure application in the portion corresponding to the center of the test piece. From this through-hole, fill the space surrounded by the facing surface of the two acrylic resin plates and the test piece with distilled water, and then apply a pressure of 15 kPa, and start applying the pressure and confirm that there is water leakage. The time until this was observed visually and evaluated as the water stoppage time (minutes). The point in time when water leakage was confirmed was taken as the end point of the water stoppage time. The evaluation was performed immediately after the test piece was placed between the acrylic resin boards and after curing for 12 hours at 70 ° C. If the water stoppage time exceeded 72 hours, it was shown as “no leak” in Tables 1 and 2. [0125] (7) Dimensional stability
- the test piece was cured at 70 ° C for 1 week (7 days). Then, the dimensions in the longitudinal direction, lateral direction of the test piece and the direction orthogonal to the surface of the closed cell foam rubber sheet (hereinafter referred to as “thickness direction”) are calculated, and the shrinkage rate in each direction is calculated by the following formula,
- the shrinkage ratio in the longitudinal and lateral directions was used as an index of dimensional stability in the plane direction, and the shrinkage ratio in the thickness direction was used as an index of dimensional stability in the thickness direction.
- Shrinkage rate (%) 100 X (dimension before curing dimension after curing) Z dimension before curing
- the obtained closed-cell foamed rubber sheet or laminate strength was cut into a plane rectangular shape with a length of 200mm x width 50mm, and a test piece was prepared. After the lapse of minutes, the amount of deflection at the free end of the test piece was measured.
- the closed-cell foamed rubber sheet and laminate of Example 111 are within the range of the apparent density and compression set defined in the present invention, and have high peel strength, that is, covered It is clear that the interfacial adhesion with the seal member (structural member to be water-stopped) is excellent and the water-proof property evaluation is also good.
- the closed-cell foamed rubber sheet of Example 4 5 has a dimensional change (shrinkage) rate by cross-linking after foaming using a cross-linking agent having a half-life temperature of 1 minute higher than the decomposition temperature of the foaming agent. The compression set is reduced.
- the closed-cell foamed rubber sheet of Example 67 contains a softener or a high softening point resin. Therefore, it is clear that the shrinkage rate is small and the dimensional stability is excellent.
- the closed-cell foamed rubber sheet provided with the pressure-sensitive adhesive layer of Examples 8 and 9, that is, the laminate can remarkably increase the peel strength as compared with that without the pressure-sensitive adhesive layer (Example 1). It is possible to further improve the aqueous property, and it can be applied as a seal material under more severe conditions.
- the closed-cell foamed rubber sheet of Comparative Example 1 is outside the compression set range defined in the present invention, and has low peel strength, that is, interfacial adhesion. Inferior, water stoppage evaluation after curing at 70 ° C is inferior.
- the closed-cell foamed rubber sheet of Comparative Example 2 has low foaming, which is outside the range of the apparent density defined in the present invention, has high compressive stress, and does not have good workability. It is clear that the closed-cell foamed rubber sheet is outside the compression set range defined in the present invention, has low peel strength, that is, poor interfacial adhesion, and poor water-stopping evaluation.
- the laminate of Example 11 is more rigid than the single-cell foamed rubber sheet alone of Example 12, and can be handled more easily. Industrial applicability
- the closed-cell foamed rubber sheet or laminate of the present invention can be suitably used for various sealing materials in the fields of architecture, civil engineering, electricity, electronics, vehicles and the like. Not only water-stopping sealing materials but also various sealing materials such as airtight sealing materials, soundproofing materials and sound insulating materials can be suitably used.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/086,630 US20090169860A1 (en) | 2005-12-21 | 2006-12-20 | Closed-Cell Foamed Rubber Sheet, Laminate, and Waterproof/Watertight Sealing Material Made of the Sheet or Laminate |
CN2006800482544A CN101341200B (zh) | 2005-12-21 | 2006-12-20 | 闭孔发泡橡胶片、层压体及使用它们的防水/水密性密封材料 |
JP2007551134A JPWO2007072885A1 (ja) | 2005-12-21 | 2006-12-20 | 独立気泡発泡ゴムシート、積層体及びそれらを用いた止水・水密シール材 |
EP20060835047 EP1970403B1 (en) | 2005-12-21 | 2006-12-20 | Closed cell foam rubber sheet, laminate, and waterproof/watertight sealing material using the sheet or lamiante |
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JP2005367672 | 2005-12-21 | ||
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JP2006111748 | 2006-04-14 | ||
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JP2006274687 | 2006-10-06 |
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JP2009242623A (ja) * | 2008-03-31 | 2009-10-22 | Sekisui Chem Co Ltd | シール材 |
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Also Published As
Publication number | Publication date |
---|---|
EP1970403A1 (en) | 2008-09-17 |
EP1970403A4 (en) | 2010-04-21 |
KR20080087796A (ko) | 2008-10-01 |
CN101341200A (zh) | 2009-01-07 |
JPWO2007072885A1 (ja) | 2009-06-04 |
CN101341200B (zh) | 2011-10-12 |
US20090169860A1 (en) | 2009-07-02 |
EP1970403B1 (en) | 2012-02-08 |
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