WO2009142292A1 - ガスケット素材 - Google Patents

ガスケット素材 Download PDF

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Publication number
WO2009142292A1
WO2009142292A1 PCT/JP2009/059421 JP2009059421W WO2009142292A1 WO 2009142292 A1 WO2009142292 A1 WO 2009142292A1 JP 2009059421 W JP2009059421 W JP 2009059421W WO 2009142292 A1 WO2009142292 A1 WO 2009142292A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
filler
reinforcing fiber
joint sheet
raw material
Prior art date
Application number
PCT/JP2009/059421
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
健 藤原
浩二 秋吉
義明 浜田
康晃 永井
信介 望月
Original Assignee
日本リークレス工業株式会社
本田技研工業株式会社
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 日本リークレス工業株式会社, 本田技研工業株式会社 filed Critical 日本リークレス工業株式会社
Priority to CN2009801187741A priority Critical patent/CN102037262B/zh
Priority to BRPI0913307-0A priority patent/BRPI0913307B1/pt
Publication of WO2009142292A1 publication Critical patent/WO2009142292A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • 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
    • 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
    • C09K2200/02—Inorganic compounds
    • C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
    • 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
    • C09K2200/02—Inorganic compounds
    • C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
    • C09K2200/0247—Silica
    • 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
    • C09K2200/0612—Butadiene-acrylonitrile rubber
    • 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
    • C09K2200/0692—Fibres
    • C09K2200/0695—Polyamide fibres

Definitions

  • the present invention relates to a material for a gasket used in an engine or a transmission mounted on a vehicle or the like, and in particular, a raw material obtained by kneading rubber, a reinforcing fiber, and a filler is pressure-laminated and vulcanized with a calender roll.
  • the present invention relates to a gasket material made of a molded joint sheet.
  • the gasket insertion part between the housing of the transmission combined with the engine and the cover fixed with bolts has a large temperature change due to repeated operation and stop of the engine.
  • repeated relative displacement (fretting) occurs between the joint surfaces of the housing and the cover and the gasket due to repeated temperature changes.
  • fretting occurs due to an external force applied to the cover or the like.
  • the base material layer is combined with a surface layer and a back layer having different fixing strengths to greatly improve the seal durability as a three-layer structure, or as described in Patent Document 2,
  • the base material layer is combined with a surface layer and a back layer having different friction coefficients to provide a three-layer structure, thereby greatly improving the seal durability.
  • the strength of the reinforcing fiber is increased by increasing the mixing amount of the reinforcing fiber into the rubber material or filler, or increasing the fiber length of the reinforcing fiber.
  • aramid fibers are particularly expensive, and the amount of aramid fibers needs to be reduced in order to reduce costs.
  • the aramid fiber is a reinforcing material for improving the tensile strength of the rubber instead of the asbestos fiber which is now banned, it is difficult to reduce the compounding amount.
  • the conventional sheet has a three-layer structure, and this three-layer structure inevitably increases raw material costs, complicates the material blending, kneading process and sheet forming process. The complexity of this process is high. This leads to cost reduction.
  • the sheet described in Patent Document 3 has a two-layer structure, and kneaded aramid fiber, barium sulfate, etc. into a rubber material to increase strength while increasing flexibility of the joint sheet.
  • the present invention has been made in order to advantageously solve the above-mentioned problems, and the gasket material of the present invention is obtained by pressure laminating and vulcanizing a raw material in which rubber, reinforcing fiber and filler are mixed with a calender roll.
  • the basic composition of the raw materials is NBR as rubber: 16 to 28 wt%, aramid fiber as reinforcing fiber: 4 to 8 wt%, and these are also acicular dolomite as reinforcing fiber : 10 to 20 wt%, silica particles as a filler: 8 to 20 wt%, and inorganic filler as a filler: the balance.
  • the gasket material of the present invention aims to reduce the cost while maintaining the performance of the joint sheet.
  • the blending amount of aramid fibers is decreased, a decrease in tensile strength, a decrease in sealing performance due to a decrease in flexibility, and a decrease in heat resistance occur.
  • the aramid fiber as the reinforcing fiber has a blending amount of 4 to 8 wt%, and the aramid fiber has a specific surface area of 6 to 12 m 2 / g, which is an index of the fibrillation degree.
  • the silica particles as the filler are blended in an amount of 8 to 20 wt%, and the silica particles preferably have a primary particle diameter of, for example, 32 to 48 nm.
  • acicular dolomite as another reinforcing fiber is used at a blending amount of 10 to 20 wt%, and the acicular dolomite has, for example, a microneedle with an average particle diameter of 4 to 12 ⁇ m. It is preferable to proceed with shaping. According to this acicular dolomite, since it can finish smoothly, without making the sheet surface rough, a two-layer structure can be made possible, maintaining sealing performance.
  • clay particles hydroxous aluminum silicate
  • barium sulfate calcium carbonate
  • diatomaceous earth diatomaceous earth
  • magnesium oxide and the like can be blended with the inorganic filler serving as the remaining filler.
  • the gasket material of the present invention since the reinforcing fibers are entangled during mixing, the tensile strength of the joint sheet is improved. Further, the heat resistance can be improved by improving the compression recovery property and the stress relaxation property.
  • the gasket surface can be smoothed and the sealing performance can be sufficiently enhanced.
  • the strength of the joint sheet is not improved by the method of increasing the roll pressure or the temperature of the hot roll when the joint sheet is formed, so that the hardness of the joint sheet can be kept low, and the sealing performance can be sufficiently enhanced. It is possible to improve the sealing performance.
  • the strength of the reinforcing fiber is increased by increasing the composition amount of the reinforcing fiber, the strength of the reinforcing fiber is increased by increasing the morphological effect, and the rubber and the reinforcing fiber. Since the blending ratio of the filler is changed between the intermediate layer and the surface layer so that the surface layer is more flexible than the intermediate layer, it is manufactured by soaring raw material costs and complicated raw material compounding processes. The problem of increasing costs can be avoided.
  • FIG. 1 is a cross-sectional view showing an embodiment of the gasket material of the present invention.
  • Reference numeral 1 in the drawing denotes a joint sheet as a gasket material of the embodiment, and the joint sheet 1 is a so-called intermediate material. It has a two-layer structure of a main layer 1a made of and a surface layer 1b made of so-called dish material.
  • the joint sheet 1 includes NBR as rubber, fibrillated (fine fiber) aramid fibers as reinforcing fibers, acicular dolomite as reinforcing fibers, and silica particles as fillers.
  • the raw material mixed with an inorganic filler such as clay as a filler is supplied onto a hot roll of a calender roll having a pair of rolls of a hot roll and a cold roll, and kneaded with these rolls. It is formed by being laminated on a hot roll by pressurizing while being further vulcanized and cured by the heat of the hot roll and then peeled off from the hot roll. And in that case, as shown in FIG. 1, two layers, the main layer 1a and the surface layer 1b, are formed by varying the composition of the reinforcing fiber and the filler.
  • the basic composition of the raw materials is NBR: 16 to 28 wt%, aramid fiber: 4 to 8 wt%, acicular dolomite: 10 to 20 wt%, and silica particles: 8 It shall consist of ⁇ 20 wt% and inorganic filler: balance.
  • the aramid fiber for example, an aromatic polyamide fiber (pulp type) having a specific surface area that is an index of fibrillation degree of 6 m 2 / g or more and 12 m 2 / g or less is used. This is because if the specific surface area of the aramid fiber is less than 6 m 2 / g, the tensile strength and buckling fatigue surface pressure of the joint sheet and hence the gasket formed therefrom cannot be sufficiently increased. If the specific surface area exceeds 12 m 2 / g, the aramid in the raw material This is because it is difficult to disperse the fibers.
  • the silica particles having a primary particle diameter of 32 nm or more and 48 nm or less are used. This is because if the silica particles having a primary particle diameter of less than 32 nm and more than 48 nm are used, the axial force reduction rate of the joint sheet and thus the gasket formed therefrom is increased.
  • the said acicular dolomite uses an average particle diameter of 4 micrometers or more and 12 micrometers or less. This is because if the average particle diameter of the acicular dolomite is less than 4 ⁇ m, the joint sheet and thus the tensile strength and buckling fatigue pressure of the gasket formed therefrom cannot be sufficiently increased, and if it exceeds 12 ⁇ m, the surface of the joint sheet becomes rough. .
  • the reinforcing fibers composed of 4 to 8 wt% aramid fibers and 10 to 20 wt% acicular dolomite are entangled during mixing to maintain high flexibility of the joint sheet.
  • the strength is increased, the sealing performance can be ensured even if fretting occurs in a structure such as a housing or a cover.
  • the strength is not improved by increasing the composition amount of the reinforcing fiber or increasing the fiber length of the reinforcing fiber, the raw material cost of the gasket can be kept low, and the gasket surface can be smoothed and the sealing performance is sufficient. Since the strength of the joint sheet is not improved by increasing the roll pressure or the temperature of the hot roll when the joint sheet is laminated, the joint sheet hardness can be kept low, and the gasket against repeated compressive stress can be maintained. As a result, it is possible to prevent the deterioration of the sealing performance due to the buckling fatigue of the gasket.
  • a gasket such as a vehicle seat gasket formed by cutting the joint seat 1 of this embodiment into a predetermined contour shape
  • the rigidity of the structure such as a transmission
  • the structure for example, the housing
  • excellent sealing durability can be exhibited even if a large force is applied to the structure. That is, when the rigidity of the structure is low, the surface pressure generated in the gasket insertion portion is high immediately below and in the vicinity of the fastening bolt, but is low between the spans of the fastening bolt. For this reason, the gasket to be inserted into the gasket insertion portion is required to have high buckling resistance and good flexibility sealing properties.
  • these high values are required. It is possible to provide buckling resistance and sealability with good flexibility.
  • the above-described characteristics of the gasket such as a vehicle seat gasket formed by using the joint sheet 1 of this embodiment, conversely, the pitch of the fastening bolt or the like when designing the portion of the structure to be sealed with the gasket.
  • the degree of freedom such as the size and the cover thickness can be increased, and the weight of the structure can be reduced.
  • Joint sheets were prepared by changing the blending ratio of aramid fiber, acicular dolomite, silica, rubber, and inorganic filler as in Comparative Examples 1 to 8 shown in Table 1 and Examples 1 to 12 of the present invention. The performance was confirmed by the tensile strength, the axial force decrease rate, and the limit seal pressure test.
  • Tensile test A tensile test was performed under the conditions defined in JIS K 6251.
  • Table 1 shows the results of a tensile test, an axial force drop test, and a limit seal pressure measurement test performed on the joint sheets under the above-described conditions. From these results, Examples 1 to 16 are general examples. As a result, it was confirmed that the gasket material had good characteristics with a tensile strength of 16 MPa or more, a limit sealing performance of 0.7 MPaMP or more, and an axial force reduction rate of 12% or less. On the other hand, Comparative Examples 1 to 8 did not satisfy any one or more of the tensile strength of 16 MPa or more, the limit sealing performance of 0.7 MPa or more, and the axial force decrease rate of 12% or less.
  • the basic composition of the joint sheet is NBR: 16 to 28 wt%, more preferably 16 to 24 wt%, Aramid fiber: 4-8 wt%, more preferably 4-6 wt%, Acicular dolomite: 10-20 wt%, Silica particles: 8-20 wt%, more preferably 10-15 wt%, It is preferable that it consists of an inorganic filler: remainder.
  • FIG. 2 shows the result of a tensile test performed in the same manner as described above with the specific surface area serving as an index of the fibrillation degree of the aramid fibers changed for the joint sheet 1 of the above embodiment.
  • the fibrillation degree of the aramid fiber is 6 m 2 / g or more and the tensile strength of the joint sheet 1 is 16 MPa or more.
  • the specific surface area of the aramid fiber is desirably 6 m 2 / g or more, and 6 to 12 m 2 / g is effective.
  • FIG. 3 shows the results of the axial force reduction rate test performed in the same manner as described above with the silica particle diameter varied for the joint sheet 1 of the above embodiment.
  • the axial force reduction rate of the joint sheet 1 is reduced to 12% or less when the silica particle diameter is 32 to 50 nm.
  • the silica particle size is desirably 32 nm or more, and 32 to 50 nm is effective.
  • FIG. 4 shows the result of performing a tensile test in the same manner as described above with the needle-shaped dolomite particle diameter varied for the joint sheet 1 of the above embodiment.
  • the particle diameter of the acicular dolomite is 4.0 ⁇ m or more, and the tensile strength of the joint sheet 1 is 16 MPa or more. Therefore, it was found that the particle size of acicular dolomite is preferably 4.0 ⁇ m or more, and 4 to 12 ⁇ m is effective.
  • this invention is not limited to the above-mentioned example, It can change suitably within the description range of a claim.
  • the reinforcing fiber composed of 4 to 8 wt% aramid fiber and 10 to 20 wt% acicular dolomite is entangled during mixing while maintaining the flexibility of the joint sheet high. Since the strength is increased, the sealing performance can be ensured even if fretting occurs in a structure such as a housing or a cover.
  • the strength is not improved by increasing the composition amount of the reinforcing fiber or increasing the fiber length of the reinforcing fiber, the raw material cost of the gasket can be kept low, and the gasket surface can be smoothed and the sealing performance is sufficient. Since the strength of the joint sheet is not improved by increasing the roll pressure or the temperature of the hot roll when the joint sheet is laminated, the joint sheet hardness can be kept low, and the gasket against repeated compressive stress can be maintained. As a result, it is possible to prevent the deterioration of the sealing performance due to the buckling fatigue of the gasket.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Gasket Seals (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Reinforced Plastic Materials (AREA)
PCT/JP2009/059421 2008-05-23 2009-05-22 ガスケット素材 WO2009142292A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2009801187741A CN102037262B (zh) 2008-05-23 2009-05-22 垫料材料
BRPI0913307-0A BRPI0913307B1 (pt) 2008-05-23 2009-05-22 material de gaxeta e folha de gaxeta para um veículo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-135150 2008-05-23
JP2008135150A JP5065154B2 (ja) 2008-05-23 2008-05-23 ガスケット素材

Publications (1)

Publication Number Publication Date
WO2009142292A1 true WO2009142292A1 (ja) 2009-11-26

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PCT/JP2009/059421 WO2009142292A1 (ja) 2008-05-23 2009-05-22 ガスケット素材

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Country Link
JP (1) JP5065154B2 (zh)
CN (1) CN102037262B (zh)
BR (1) BRPI0913307B1 (zh)
WO (1) WO2009142292A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150044842A (ko) * 2012-08-09 2015-04-27 에누오케 가부시키가이샤 Nbr 조성물
JP6889276B2 (ja) * 2017-11-24 2021-06-18 Nok株式会社 ガスケット素材
CN108178855A (zh) * 2017-12-29 2018-06-19 浙江天铁实业股份有限公司 高承载铁路道口板材料及其制备方法
JP7443023B2 (ja) * 2019-10-30 2024-03-05 花王株式会社 水解性清掃物品
CN113402872B (zh) * 2021-07-29 2022-07-15 公牛集团股份有限公司 一种仿水磨石效果的免喷涂材料及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0274546A (ja) * 1988-09-09 1990-03-14 Kubota Ltd 無機質製品の押出成形方法
JP2002105437A (ja) * 2000-10-04 2002-04-10 Honda Motor Co Ltd 複合シートガスケット
JP2004036808A (ja) * 2002-07-05 2004-02-05 Nippon Leakless Corp ガスケット素材
JP2004035806A (ja) * 2002-07-05 2004-02-05 Nippon Leakless Corp ガスケット素材

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1051832C (zh) * 1995-07-31 2000-04-26 舟山市海山密封材料有限公司 摩托车发动机专用密封垫片及其制造工艺
US20060100374A1 (en) * 2002-07-05 2006-05-11 Yoshiaki Hamada Gasket material
EP1557595A4 (en) * 2002-07-05 2008-03-26 Nippon Leakless Ind Co Ltd SEAL MATERIAL
CN1247680C (zh) * 2004-11-16 2006-03-29 南京工业大学 一种非石棉混杂纤维增强橡胶基密封复合材料及其制作工艺
JP4746879B2 (ja) * 2005-01-12 2011-08-10 ニチアス株式会社 非石綿系シート状ガスケット
JP2007092904A (ja) * 2005-09-29 2007-04-12 Nichias Corp シート状ガスケット及びその製造方法
JP2007239901A (ja) * 2006-03-09 2007-09-20 Nichias Corp シート状ガスケットの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0274546A (ja) * 1988-09-09 1990-03-14 Kubota Ltd 無機質製品の押出成形方法
JP2002105437A (ja) * 2000-10-04 2002-04-10 Honda Motor Co Ltd 複合シートガスケット
JP2004036808A (ja) * 2002-07-05 2004-02-05 Nippon Leakless Corp ガスケット素材
JP2004035806A (ja) * 2002-07-05 2004-02-05 Nippon Leakless Corp ガスケット素材

Also Published As

Publication number Publication date
JP2009281524A (ja) 2009-12-03
CN102037262B (zh) 2013-10-16
JP5065154B2 (ja) 2012-10-31
BRPI0913307B1 (pt) 2020-06-30
BRPI0913307A2 (pt) 2019-09-10
CN102037262A (zh) 2011-04-27

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