JPH08225314A - Expanded graphite sheet - Google Patents
Expanded graphite sheetInfo
- Publication number
- JPH08225314A JPH08225314A JP7072238A JP7223895A JPH08225314A JP H08225314 A JPH08225314 A JP H08225314A JP 7072238 A JP7072238 A JP 7072238A JP 7223895 A JP7223895 A JP 7223895A JP H08225314 A JPH08225314 A JP H08225314A
- Authority
- JP
- Japan
- Prior art keywords
- expanded graphite
- graphite sheet
- gasket
- pressure
- release agent
- 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.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 34
- 239000010439 graphite Substances 0.000 title claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 abstract description 26
- 238000005979 thermal decomposition reaction Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000013011 mating Effects 0.000 description 5
- -1 polytetrafluoroethylene Polymers 0.000 description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 4
- 239000010425 asbestos Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 4
- 235000012489 doughnuts Nutrition 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 229910052895 riebeckite Inorganic materials 0.000 description 4
- 239000006082 mold release agent Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
- Gasket Seals (AREA)
- Laminated Bodies (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、表面に離型剤を付着さ
せた膨張黒鉛シートに関し、配管の接続部において気体
や液体の漏れを防止するために使用されているガスケッ
ト用材料、更に詳言すれば、原子力発電所や火力発電所
等の高温高圧配管の接続部に用いられるガスケット用材
料に最適な膨張黒鉛シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded graphite sheet having a release agent adhered to the surface thereof, which is used as a gasket material for preventing leakage of gas or liquid at a connecting portion of a pipe, and more particularly, to a gasket material. In other words, the present invention relates to an expanded graphite sheet that is most suitable as a material for a gasket used in a connection part of high-temperature and high-pressure piping in a nuclear power plant, a thermal power plant, or the like.
【０００２】[0002]
【従来の技術】原子力発電所、火力発電所および一般産
業用の高圧蒸気発生装置や、化学プラント等の高温高圧
配管の接続部には、気体または液体の漏れを防ぐための
ガスケットが用いられている。このガスケットの材料
は、アスベストジョイントシート、ノンアスベストジョ
イントシート、アスベストビーターシート、ノンアスベ
ストビーターシート、膨張黒鉛シート、膨張黒鉛シート
複合材料等であり、その目的と使用条件により選択され
て使用されている。ここでいう膨張黒鉛シートとして
は、鱗片状天然黒鉛の硫酸層間化合物を約１０００℃に
急熱して膨張させた後、圧縮成形によりシート状に賦形
したものを例示できる。2. Description of the Related Art Gasket or liquid gaskets are used to prevent gas or liquid from leaking at the connection of high-temperature steam generators for nuclear power plants, thermal power plants, general industries, and chemical plants. There is. The material of this gasket is an asbestos joint sheet, a non-asbestos joint sheet, an asbestos beater sheet, a non-asbestos beater sheet, an expanded graphite sheet, an expanded graphite sheet composite material, etc., which is selected and used according to its purpose and use conditions. . Examples of the expanded graphite sheet used here include those obtained by rapidly heating a sulfuric acid intercalation compound of scaly natural graphite to about 1000 ° C. to expand it, and then shaping it into a sheet by compression molding.
【０００３】ところが、上記ガスケットは、温度が約１
００℃以上の環境下で使用すると、接続部のフランジと
ガスケットが固着して簡単に離れなくなるため、定期交
換や修理時にガスケットを剥してフランジ面を清浄にす
る作業に大変な労力が払われている。この問題を解決す
るために、例えば、高価なポリテトラフルオロエチレン
をコーティングすることにより離型性を高めたガスケッ
ト用材料が開発されたが、ポリテトラフルオロエチレン
の耐熱温度は約２５０℃であるため、この温度以上では
使用できないのみならず、常温においても締め付け圧力
により厚さが減少するので、ガスケットの締め付け圧力
が低下して、頻繁に増し締めを行う必要があった。ま
た、膨張黒鉛シートのような強度が低く剥離し易い材料
を用いたガスケットでは、表面にポリテトラフルオロエ
チレンのコーティングを施しても、フランジ面との僅か
な接着力によって膨張黒鉛シートは剥離して、ポリテト
ラフルオロエチレン膜がフランジ面に固着したまま残存
するため、根本的な解決にはならなかった。However, the temperature of the gasket is about 1
If the product is used in an environment of 00 ° C or higher, the flange of the connection part and the gasket will stick and will not be easily separated, so a lot of work will be required to remove the gasket and clean the flange surface at the time of regular replacement or repair. There is. In order to solve this problem, for example, a gasket material having improved releasability by coating with expensive polytetrafluoroethylene was developed, but the heat-resistant temperature of polytetrafluoroethylene is about 250 ° C. Not only cannot it be used above this temperature, but the thickness also decreases due to the tightening pressure at room temperature, so the tightening pressure of the gasket decreases and it was necessary to frequently perform additional tightening. Also, in the case of a gasket using a material that has low strength and is easy to peel off, such as expanded graphite sheet, even if the surface is coated with polytetrafluoroethylene, the expanded graphite sheet will peel off due to the slight adhesive force with the flange surface. Since the polytetrafluoroethylene film remains fixed on the flange surface, it was not a fundamental solution.
【０００４】[0004]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、高温で使用しても応力緩和率（熱によるヘ
タリの指数）が小さく熱分解をしないという耐熱性を有
し、かつ高温で使用した後もフランジ面等の相手材に固
着しないガスケット用材料を提供することである。The problem to be solved by the present invention is that it has heat resistance such that it has a small stress relaxation rate (exponential index due to heat) even if it is used at high temperature and does not decompose thermally. The object is to provide a gasket material that does not stick to a mating material such as a flange surface even after being used in.
【０００５】[0005]
【課題を解決するための手段】この課題は、耐熱性が良
く、かつ強度が比較的低い物質の微粒子を、膨張黒鉛シ
ートの表面に、結合剤により極めて弱く付着させたガス
ケット材料によって解決されることを見出した。すなわ
ち、本発明に係るシートは、膨張黒鉛シートの片面また
は両面に、結合剤であるアルミニウムイソプロポキシド
を介して離型剤を付着させた膨張黒鉛シートである。ま
た、特に最適な上記結合剤の添加量は、離型剤の重量の
２０％以上、１００％以下の範囲である。This problem is solved by a gasket material in which fine particles of a substance having good heat resistance and relatively low strength are attached to the surface of an expanded graphite sheet very weakly with a binder. I found that. That is, the sheet according to the present invention is an expanded graphite sheet in which a release agent is attached to one surface or both surfaces of the expanded graphite sheet via aluminum isopropoxide as a binder. Further, the most suitable amount of the binder added is in the range of 20% or more and 100% or less of the weight of the release agent.
【０００６】本発明者等は、高温高圧によって、ガスケ
ットがフランジ等の相手材に固着する原因の究明するた
めに、温度や圧力の様々な条件下でガスケットの固着力
の測定を行ったところ、低温においてはフランジの締め
付け圧力が上昇するほど固着力が増加するが、温度が３
００℃以上になるとフランジの締め付け圧力に拘らず、
ガスケットの固着力が減少してゆくことを発見した。ま
た、ジョイントシートやビーターシートなどのガスケッ
ト材料中にゴム成分を含むガスケット材料では、高温高
圧によってゴム成分が接着剤として作用してしまい、相
手材と強力に固着することが明らかになった。さらに、
最も固着力が強くなる１００〜２００℃の温度におい
て、フランジ面やガスケット表面の清浄度を変化させて
固着力を測定したところ、フランジ面とガスケット表面
の双方が完全に清浄な状態であれば、固着はほとんど生
じることはないが、表面が僅かでも汚染されていると、
ガスケット材料と相手材が強く固着することを発見し、
膨張黒鉛シート製ガスケットやポリテトラフルオロエチ
レンをコーティングしたガスケットにおいても固着が生
じる原因を解明した。その結果、ガスケット材料の固着
を防止するためには、ガスケット材料の表面に離型性の
良い物質を塗布すれば良いとの結論に達したが、離型剤
として代表的な物質であるポリテトラフルオロエチレン
にしても、前述のように僅かな汚染により固着してしま
い、完全な離型性は示さなかった。The inventors of the present invention measured the adhesion force of the gasket under various conditions of temperature and pressure in order to investigate the cause of the adhesion of the gasket to the mating material such as the flange due to high temperature and high pressure. At low temperature, the fixing force increases as the tightening pressure of the flange increases,
When the temperature exceeds 00 ° C, regardless of the tightening pressure of the flange,
It was discovered that the adhesive strength of the gasket decreased. Further, it has been clarified that in a gasket material containing a rubber component in a gasket material such as a joint sheet or a beater sheet, the rubber component acts as an adhesive due to high temperature and high pressure and strongly adheres to the mating material. further,
At a temperature of 100 to 200 ° C. at which the adhesive strength becomes the strongest, the adhesive strength was measured by changing the cleanliness of the flange surface and the gasket surface. If both the flange surface and the gasket surface were completely clean, Sticking hardly occurs, but if the surface is slightly contaminated,
It was discovered that the gasket material and the mating material were strongly bonded,
We also clarified the cause of sticking in the expanded graphite sheet gasket and the gasket coated with polytetrafluoroethylene. As a result, in order to prevent the sticking of the gasket material, it was concluded that a material with a good mold release property should be applied to the surface of the gasket material. Even with fluoroethylene, it was fixed due to slight contamination as described above, and did not exhibit perfect releasability.
【０００７】本発明者等は、離型剤について研究を重ね
た結果、例えば結合剤として従来から使用されているポ
リビニルアルコール等の熱可塑性樹脂が離型剤中に含ま
れていると、仮に常温において優れた離型性を発現した
としても、ガスケット材料の基本的特性値である応力緩
和率が非常に悪くなることが明らかになった。すなわ
ち、結合剤となる熱可塑性樹脂を介して離型剤が塗布さ
れたガスケット材料が、フランジの間に装着され、締め
付けられた後、熱可塑性樹脂の軟化点以上の温度で使用
される場合には、樹脂が軟化してフランジの締付け圧力
によって押し出されるために、フランジの締め付け圧力
が低下するという本質的な欠点を有することが明らかに
なった。As a result of repeated research on the release agent, the inventors of the present invention have found that if the release agent contains a thermoplastic resin such as polyvinyl alcohol which has been conventionally used as a binder, it is assumed that the release temperature is room temperature. It was revealed that even if excellent releasability was exhibited in, the stress relaxation rate, which is a basic characteristic value of the gasket material, becomes extremely poor. That is, when a gasket material coated with a release agent through a thermoplastic resin serving as a binder is mounted between the flanges and tightened, and is used at a temperature equal to or higher than the softening point of the thermoplastic resin, Has been found to have an essential drawback in that the flange clamping pressure is reduced because the resin softens and is pushed out by the flange clamping pressure.
【０００８】換言すれば、ガスケット材料表面に塗布す
る離型剤は、耐熱性の良好な物質の組み合わせによって
構成されていなければならないことが明らかになった。In other words, it has become clear that the release agent applied to the surface of the gasket material must be composed of a combination of substances having good heat resistance.
【０００９】本発明では耐熱性の良い離型剤として、従
来公知の物質、例えば黒鉛粉末、雲母粉末、滑石粉末、
窒化ホウ素粉末、二硫化モリブデン粉末を利用できる
が、これらの離型剤は比較的高強度の製品のための離型
剤として従来使用されてきたものなので、これらの離型
剤を接着させるための結合剤の強度や添加量に考慮を払
わないと、離型剤の被膜自身の強度が強くなり過ぎてし
まい、膨張黒鉛シート製ガスケット材のような低強度の
材料には離型性を発揮し得ない。また、従来の離型剤は
ガスケットへの使用を想定していないため、離型剤被膜
のガス透過性には考慮が払われておらず、従来の離型剤
を膨張黒鉛ガスケットに適用した場合には、フランジを
取り外す際に離型剤が離型性を発現せず、膨張黒鉛シー
トが破壊されるだけではなく、封止ガスや封止液がガス
ケットとフランジの接触面で離型剤被膜を通って使用中
に漏れることがあった。In the present invention, as a releasing agent having good heat resistance, a conventionally known substance such as graphite powder, mica powder, talc powder,
Although boron nitride powder and molybdenum disulfide powder can be used, these mold release agents have been conventionally used as mold release agents for relatively high-strength products. Unless consideration is given to the strength of the binder and the amount added, the strength of the mold release agent coating itself becomes too strong, and it exhibits mold releasability for low strength materials such as expanded graphite sheet gasket materials. I don't get it. Moreover, since the conventional release agent is not supposed to be used for gaskets, the gas permeability of the release agent coating is not taken into consideration.When applying the conventional release agent to the expanded graphite gasket, In addition, the release agent does not develop releasability when the flange is removed, and not only the expanded graphite sheet is destroyed, but also the sealing gas and the sealing liquid are coated with the release agent coating on the contact surface between the gasket and the flange. It sometimes leaked during use.
【００１０】そこで本発明者等は、結合剤としてアルミ
ニウムイソプロポキシドを利用すると、塗布後の乾燥時
に空気中の水分と反応して酸化アルミニウムに変化しつ
つ離型剤を結合させることができる上に、その結合力が
適度に弱く、かつ耐熱性が優れているので好適に使用で
きることを見出した。ここで、このアルミニウムイソプ
ロポキシドを結合剤として使用する際には、その添加量
が離型剤の重量よりも多くなると結合力が膨張黒鉛シー
トより勝るため、充分な離型性を発現させることは困難
になり、また、その添加量が離型剤の重量の２０％未満
になると、離型剤被膜の強度が弱くなり過ぎてしまうた
め、比較的簡単に剥離してしまう。それ故、結合剤アル
ミニウムイソプロポキシドの添加量は、離型剤の重量の
２０％から１００％の範囲が望ましく、２５％から８０
％の範囲が特に望ましい。Therefore, the present inventors can bond a release agent while using aluminum isopropoxide as a binder while reacting with moisture in the air during the drying after coating to change to aluminum oxide. Furthermore, they have found that they can be suitably used because their bonding strength is appropriately weak and they have excellent heat resistance. Here, when this aluminum isopropoxide is used as a binder, the binding force is superior to that of the expanded graphite sheet when the amount added is larger than the weight of the release agent, and therefore sufficient release property is expressed. If the amount of addition is less than 20% of the weight of the release agent, the strength of the release agent coating becomes too weak, resulting in relatively easy peeling. Therefore, the amount of the binder aluminum isopropoxide added is preferably in the range of 20% to 100% by weight of the release agent, and more preferably 25% to 80%.
The range of% is particularly desirable.
【００１１】一方、従来より利用されているフェノール
樹脂やフラン樹脂のような熱硬化性樹脂やテトラエトキ
シシランのような強力な結合剤では、離型剤被膜自体が
簡単に破壊される程度に結合剤の添加量を極力少なくし
ても、離型剤の粒子と粒子との結合力がなお強く、膨張
黒鉛シートのような低強度の素材に対しては、充分な離
型性を発現しないことを確認した。本発明は、以上のよ
う知見に基づいて完成させたものである。On the other hand, thermosetting resins such as phenol resin and furan resin and strong binders such as tetraethoxysilane, which have been conventionally used, bond to such an extent that the release agent coating itself is easily destroyed. Even if the additive amount of the agent is reduced as much as possible, the binding force between the particles of the release agent is still strong, and sufficient releasability is not exhibited for low-strength materials such as expanded graphite sheet. It was confirmed. The present invention has been completed based on the above findings.
【００１２】[0012]
【実施例】本発明の実施例を以下に記述するが、本発明
はこれに限定されるものではない。EXAMPLES Examples of the present invention will be described below, but the present invention is not limited thereto.
【００１３】実施例１ 滑石粉末（林化成株式会社製ミセルトン）７５重量部
と、アルミニウムイソプロポキシド（和光純薬工業株式
会社製）２５重量部を１００重量部のシクロヘキサン中
で混合した。この混合溶液を、厚さ１ｍｍ密度１ｇ／ｃ
ｍ３の膨張黒鉛シート（東洋炭素株式会社製ＰＦ１０
０）の両面に塗布した後、乾燥させて表面に１．０ｍｇ
／ｃｍ２の被膜を得た。かかる膨張黒鉛シートをφ４８
ｍｍ×φ３２ｍｍのドーナツ状に打ち抜き加工した後、
２校の鉄製厚板の間に挟み２０９ＭＰａの圧力をかけ
た。圧力をかけたままの状態で２００℃まで昇温して、
２２時間保持した後、圧力をかけたまま冷却した。冷却
後、圧力を開放したところ、膨張黒鉛シートと鉄製厚板
とは全く固着しておらず、試料は簡単に取り出せた。Example 1 75 parts by weight of talc powder (Micelleton manufactured by Hayashi Kasei Co., Ltd.) and 25 parts by weight of aluminum isopropoxide (manufactured by Wako Pure Chemical Industries, Ltd.) were mixed in 100 parts by weight of cyclohexane. This mixed solution has a thickness of 1 mm and a density of 1 g / c.
m 3 expanded graphite sheet (PF10 manufactured by Toyo Tanso Co., Ltd.)
0) After coating on both sides, it is dried to 1.0 mg on the surface.
A coating of / cm 2 was obtained. This expanded graphite sheet is
After punching into a donut shape of mm x φ 32 mm,
It was sandwiched between the iron plates of two schools and a pressure of 209 MPa was applied. With the pressure still applied, raise the temperature to 200 ° C,
After holding for 22 hours, it was cooled while pressure was applied. When the pressure was released after cooling, the expanded graphite sheet and the iron thick plate were not fixed at all, and the sample could be taken out easily.
【００１４】実施例２ 鱗片状天然黒鉛粉末（マダガスカル産）８０重量部と、
アルミニウムイソプロポキシド（和光純薬工業株式会社
製）２０重量部を１００重量部のシクロヘキサン中で混
合した。この混合溶液を、厚さ１ｍｍ密度１ｇ／ｃｍ３
の膨張黒鉛シート（東洋炭素株式会社製ＰＦ１００）の
両面に塗布した後、乾燥させて表面に１．５ｍｇ／ｃｍ
２の被膜を得た。かかる膨張黒鉛シートをφ４８ｍｍ×
φ３２ｍｍのドーナツ状に打ち抜き加工した後、２枚の
鉄製厚板の間に挟み２０９ＭＰａの圧力をかけた。圧力
をかけたままの状態で２００℃まで昇温して、２２時間
保持した後、圧力をかけたまま冷却した。冷却後、圧力
を開放したところ、膨張黒鉛シートと鉄製厚板とは極め
て弱く接着していたが、試料は簡単に取り出せた。Example 2 80 parts by weight of flaky natural graphite powder (produced in Madagascar),
20 parts by weight of aluminum isopropoxide (manufactured by Wako Pure Chemical Industries, Ltd.) was mixed in 100 parts by weight of cyclohexane. This mixed solution has a thickness of 1 mm and a density of 1 g / cm 3
Coated on both sides of the expanded graphite sheet (PF100 manufactured by Toyo Tanso Co., Ltd.) and then dried to 1.5 mg / cm on the surface.
A coating of 2 was obtained. This expanded graphite sheet is φ 48 mm ×
After punching into a φ32 mm donut shape, it was sandwiched between two iron thick plates and a pressure of 209 MPa was applied. The temperature was raised to 200 ° C. with the pressure applied, and the temperature was maintained for 22 hours, and then cooled with the pressure applied. When the pressure was released after cooling, the expanded graphite sheet and the iron thick plate were bonded very weakly, but the sample could be taken out easily.
【００１５】実施例３ 滑石粉末（林化成株式会社製ミセルトン）５０重量部
と、アルミニウムイソプロポキシド（和光純薬工業株式
会社製）５０重量部を１００重量部のシクロヘキサン中
で混合した。この混合溶液を、厚さ１ｍｍ密度１ｇ／ｃ
ｍ３の膨張黒鉛シート（東洋炭素株式会社製ＰＦ１０
０）の両面に塗布した後、乾燥させて表面に１．２ｍｇ
／ｃｍ２の被膜を得た。かかる膨張黒鉛シートをφ４８
ｍｍ×φ３２ｍｍのドーナツ状に打ち抜き加工した後、
２枚の鉄製厚板の間に挟み２０９ＭＰａの圧力をかけ
た。圧力をかけたままの状態で２００℃まで昇温して、
２２時間保持した後、圧力をかけたまま冷却した。冷却
後、圧力を開放したところ、膨張黒鉛シートと鉄製厚板
とは弱く接着しており、試料の表面は少し剥離したが、
試料は簡単に取り出せた。Example 3 50 parts by weight of talc powder (Micelleton manufactured by Hayashi Kasei Co., Ltd.) and 50 parts by weight of aluminum isopropoxide (manufactured by Wako Pure Chemical Industries, Ltd.) were mixed in 100 parts by weight of cyclohexane. This mixed solution has a thickness of 1 mm and a density of 1 g / c.
m 3 expanded graphite sheet (PF10 manufactured by Toyo Tanso Co., Ltd.)
0) After coating on both sides, it is dried to 1.2 mg on the surface.
A coating of / cm 2 was obtained. This expanded graphite sheet is
After punching into a donut shape of mm x φ 32 mm,
It was sandwiched between two iron thick plates and a pressure of 209 MPa was applied. With the pressure still applied, raise the temperature to 200 ° C,
After holding for 22 hours, it was cooled while pressure was applied. When the pressure was released after cooling, the expanded graphite sheet and the iron plate were weakly adhered, and the surface of the sample was slightly peeled off,
The sample was easily removed.
【００１６】実施例４ 滑石粉末（林化成株式会社製ミセルトン）４０重量部
と、アルミニウムイソプロポキシド（和光純薬工業株式
会社製）６０重量部を１００重量部のシクロヘキサン中
で混合した。この混合溶液を、厚さ１ｍｍ密度１ｇ／ｃ
ｍ３の膨張黒鉛シート（東洋炭素株式会社製ＰＦ１０
０）の両面に塗布した後、乾燥させて表面に１．４ｍｇ
／ｃｍ２の披膜を得た。かかる膨張黒鉛シートをφ４８
ｍｍ×φ３２ｍｍのドーナツ状に打ち抜き加工した後、
２枚の鉄製厚板の間に挟み２０９ＭＰａの圧力をかけ
た。圧力をかけたままの状態で２００℃まで昇温して、
２２時間保持した後、圧力をかけたまま冷却した。冷却
後、圧力を開放したところ、膨張黒鉛シートと鉄製厚板
とは強く接着しており、試料の取り出し時に、試料の中
央が破断し、余り望ましくないことが分かった。Example 4 40 parts by weight of talc powder (Micelleton manufactured by Hayashi Kasei Co., Ltd.) and 60 parts by weight of aluminum isopropoxide (manufactured by Wako Pure Chemical Industries, Ltd.) were mixed in 100 parts by weight of cyclohexane. This mixed solution has a thickness of 1 mm and a density of 1 g / c.
m 3 expanded graphite sheet (PF10 manufactured by Toyo Tanso Co., Ltd.)
0) After coating on both sides, it is dried to 1.4mg on the surface.
A lingual membrane of / cm 2 was obtained. This expanded graphite sheet is
After punching into a donut shape of mm x φ 32 mm,
It was sandwiched between two iron thick plates and a pressure of 209 MPa was applied. With the pressure still applied, raise the temperature to 200 ° C,
After holding for 22 hours, it was cooled while pressure was applied. When the pressure was released after cooling, it was found that the expanded graphite sheet and the iron thick plate were strongly adhered to each other and the center of the sample was broken when the sample was taken out, which was not very desirable.
【００１７】[0017]
【発明の効果】本発明により、膨張黒鉛シートを素材に
したガスケットが相手材のフランジに固着することがな
くなり、高温などの苛酷な条件下や高所などの危険な条
件下でも、配管の保守点検作業を短時間で行えるので、
経費の節減および作業者の安全に対する貢献度は計りし
れない。EFFECTS OF THE INVENTION According to the present invention, a gasket made of an expanded graphite sheet does not stick to a flange of a mating material, and piping maintenance is performed even under severe conditions such as high temperature and dangerous conditions such as high places. Because the inspection work can be done in a short time,
Cost savings and contributions to worker safety are immeasurable.
Claims (2)
合剤であるアルミニウムイソプロポキシドを介して離型
剤を付着させた膨張黒鉛シート。1. An expanded graphite sheet having a release agent attached to one or both sides of an expanded graphite sheet via aluminum isopropoxide as a binder.
２０％以上、１００％以下の範囲である請求項１に記載
の膨張黒鉛シート。2. The expanded graphite sheet according to claim 1, wherein the amount of the binder added is in the range of 20% or more and 100% or less of the weight of the release agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7072238A JPH08225314A (en) | 1995-02-21 | 1995-02-21 | Expanded graphite sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7072238A JPH08225314A (en) | 1995-02-21 | 1995-02-21 | Expanded graphite sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08225314A true JPH08225314A (en) | 1996-09-03 |
Family
ID=13483517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7072238A Pending JPH08225314A (en) | 1995-02-21 | 1995-02-21 | Expanded graphite sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08225314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011163495A (en) * | 2010-02-12 | 2011-08-25 | Nichias Corp | Coated corrugated metal gasket |
-
1995
- 1995-02-21 JP JP7072238A patent/JPH08225314A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011163495A (en) * | 2010-02-12 | 2011-08-25 | Nichias Corp | Coated corrugated metal gasket |
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