JPH01317168A - Flexible graphite material and production thereof - Google Patents
Flexible graphite material and production thereofInfo
- Publication number
- JPH01317168A JPH01317168A JP63233162A JP23316288A JPH01317168A JP H01317168 A JPH01317168 A JP H01317168A JP 63233162 A JP63233162 A JP 63233162A JP 23316288 A JP23316288 A JP 23316288A JP H01317168 A JPH01317168 A JP H01317168A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- expanded
- condensed phosphate
- expanded graphite
- solution
- 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
- 239000007770 graphite material Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 52
- 239000010439 graphite Substances 0.000 claims abstract description 52
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000010452 phosphate Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007800 oxidant agent Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 abstract description 11
- 238000009830 intercalation Methods 0.000 abstract description 8
- 230000002687 intercalation Effects 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052708 sodium Inorganic materials 0.000 abstract description 6
- 239000011734 sodium Substances 0.000 abstract description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 5
- 239000000243 solution Substances 0.000 abstract description 5
- 239000003566 sealing material Substances 0.000 abstract description 4
- 239000011259 mixed solution Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 235000021317 phosphate Nutrition 0.000 description 10
- 230000013011 mating Effects 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 235000011835 quiches Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ガスケット、バッキング、バルブシート等に
用いられる可撓性黒鉛材及びその製造法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flexible graphite material used for gaskets, backings, valve seats, etc., and a method for manufacturing the same.
（従来の技術）
天然黒鉛、キッシュ黒鉛など高度に結晶構造の発達した
黒鉛は硝酸、過マンガン酸カリウム、過酸化水素水など
の強酸化剤の存在下で硫酸と処理することによシ、硫酸
が黒鉛層間に浸入した黒鉛層間化合物が形成される。該
黒鉛層間化合物は６００℃以上の高温で加熱することに
よシ黒鉛粒子が層方向に１００倍以上に膨張した。去状
形の膨張黒鉛となる。この膨張黒鉛を加圧して得た膨張
黒鉛成形体は耐熱性、耐薬品性に優れると因った黒鉛元
来の特性に加え圧縮復元性に富み、応力緩和性、シール
性に富み自動車用ガスケット材。(Prior art) Graphite with a highly developed crystal structure, such as natural graphite and Quiche graphite, can be treated with sulfuric acid in the presence of a strong oxidizing agent such as nitric acid, potassium permanganate, or hydrogen peroxide. A graphite intercalation compound is formed in which the particles penetrate between the graphite layers. When the graphite intercalation compound was heated at a high temperature of 600° C. or higher, the graphite particles expanded 100 times or more in the layer direction. It becomes expanded graphite in exfoliated form. The expanded graphite molded product obtained by pressurizing this expanded graphite has not only the original properties of graphite such as excellent heat resistance and chemical resistance, but also has high compression recovery properties, stress relaxation properties, and sealing properties, and is used for automobile gaskets. Material.
化学プラント用などに使用されておシ、近年特にアスベ
スト規制との関係上、その使用範囲は広がシ、使用量は
増大している。It is used in chemical plants, etc., and in recent years the scope of its use has expanded and the amount used has increased, especially in relation to asbestos regulations.
（発明が解決しようとする課題）
しかしながら通常の濃硫酸を用いた膨張黒鉛の製造方法
においては高温での膨張処理後も、５０〜２００ ｐＩ
）ｍの硫酸根、および、硫酸の熱分解生成物としての硫
黄を含む化合物が膨張黒鉛中に５００〜１０００１）ｐ
ｍ残留する。これを加圧して得た膨張黒鉛成形体をシー
ル材の素材として使用した場合、膨張黒鉛に残留した硫
酸根および硫黄を含む化合物がシール面の金属面に対し
て腐食を誘起する原因となる。(Problems to be Solved by the Invention) However, in the conventional manufacturing method of expanded graphite using concentrated sulfuric acid, even after expansion treatment at high temperature, the
) m sulfate group and a compound containing sulfur as a thermal decomposition product of sulfuric acid are present in expanded graphite from 500 to 10001) p
m remains. When an expanded graphite molded body obtained by pressurizing this is used as a material for a sealing material, compounds containing sulfuric acid radicals and sulfur remaining in the expanded graphite cause corrosion of the metal surface of the sealing surface.
この金属面に対する腐食を抑制するためには。In order to suppress corrosion on this metal surface.
膨張黒鉛シートから硫酸根および硫黄を含む不純物の量
を低減させることが必要であるが、現状では商業的ベー
スからは硫酸を使用しな込膨張黒鉛の製造方法は見出さ
れておらず、また膨張黒鉛の脱硫処理には種々の試みが
なされているが、未だ効果的で安価な脱硫方法が見出さ
れていない。It is necessary to reduce the amount of impurities containing sulfuric acid radicals and sulfur from expanded graphite sheets, but at present no commercial method has been found for producing expanded graphite without using sulfuric acid. Although various attempts have been made to desulfurize expanded graphite, an effective and inexpensive desulfurization method has not yet been found.
本発明は、シール材等に使用する際に相手材である金属
面に対する腐食を抑制する可撓性黒鉛材及びその製造法
を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible graphite material that suppresses corrosion to a metal surface, which is a mating material, when used as a sealing material, etc., and a method for manufacturing the same.
（課題を解決するための手段）
本発明は、膨張黒鉛成形体に縮合リン酸塩を含有させた
可撓性黒鉛シート及びその製造法に関する。(Means for Solving the Problems) The present invention relates to a flexible graphite sheet in which an expanded graphite molded body contains a condensed phosphate, and a method for manufacturing the same.
本発明において、膨張黒鉛成形体とは膨張黒鉛シートの
ような公知の方法によって得られるものであり、たとえ
ば、天然鱗状黒鉛を濃硫酸と濃硝酸との混液中に浸漬し
て酸化した後水洗、脱水を行い、過剰な酸および黒鉛表
面に付着している酸をとり除いて黒鉛層間化合物を得、
これを急熱して膨張処理を行うことにより、原料黒鉛を
カサ密度比で５０倍以上の倍率に膨張した膨張黒鉛を得
。In the present invention, expanded graphite molded bodies are those obtained by known methods such as expanded graphite sheets, such as immersing natural scale graphite in a mixed solution of concentrated sulfuric acid and concentrated nitric acid to oxidize it, and then washing with water; Dehydration is performed to remove excess acid and acid attached to the graphite surface to obtain a graphite intercalation compound.
By rapidly heating this and performing an expansion treatment, expanded graphite expanded to a bulk density ratio of 50 times or more is obtained.
該膨張黒鉛を加圧成形したものである。膨張黒鉛を得る
ための原料の黒鉛としては天然の鱗片状黒鉛以外に熱分
解黒鉛、キッシュ黒鉛などが使用される。酸化する混液
としては、濃硫酸−濃硝酸以外に濃硫酸−過マンガン酸
カリウム、濃硫酸−過酸化水素水、濃硫酸−過硫酸アン
モニウムなと濃硫酸を主体とした多くの組合せが使用さ
れる。This expanded graphite is pressure molded. As the raw material graphite for obtaining expanded graphite, in addition to natural flaky graphite, pyrolytic graphite, quiche graphite, etc. are used. As the mixed liquid to be oxidized, in addition to concentrated sulfuric acid and concentrated nitric acid, many combinations mainly consisting of concentrated sulfuric acid such as concentrated sulfuric acid and potassium permanganate, concentrated sulfuric acid and hydrogen peroxide, concentrated sulfuric acid and ammonium persulfate, and concentrated sulfuric acid are used.
含有させる縮合リン酸塩はビロリン酸、ポリリン酸、テ
トラポリリン酸、ヘキサメタリン酸、メタリン酸等のア
ルカリ金属、アルカリ土類金属などの金属塩が用いられ
るが２通常は入手のしやすプ振
さからナトリウムが好ましい。As the condensed phosphate to be contained, metal salts of alkali metals and alkaline earth metals such as birophosphoric acid, polyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, and metaphosphoric acid are used. Sodium is preferred.
△
可撓性黒鉛材を得るには二つの方法があり、その一つは
膨張黒鉛成形体に縮合リン酸塩を、水などの溶媒に溶解
した溶液状で含浸し、その後乾燥により水分等を揮発さ
せる方法である（第一の製造法）。△ There are two methods to obtain flexible graphite material. One is to impregnate an expanded graphite molded body with condensed phosphate in a solution dissolved in a solvent such as water, and then dry it to remove moisture. This is a method of volatilization (first manufacturing method).
この場合、縮合リン酸塩の可撓性黒鉛材中の含有率は固
形分で０．０１〜１０重量％とするのが好ましい。少な
いと相手材の腐食を防止する効果が不足し、多すぎると
材料の機械的強度及び可撓性が低下するからである。In this case, the content of the condensed phosphate in the flexible graphite material is preferably 0.01 to 10% by weight in terms of solid content. If the amount is too small, the effect of preventing corrosion of the mating material will be insufficient, and if it is too large, the mechanical strength and flexibility of the material will decrease.
第二の製造法は、黒鉛を前記した混液で酸化し水、洗、
脱水して得られる黒鉛層間化合物を縮合リン酸塩溶液中
に浸漬し、脱水した後、以下、公知の方法で急熱して縮
合リン酸塩含有膨張黒鉛を得。The second production method involves oxidizing graphite with the above-mentioned mixture, washing it with water, and
The graphite intercalation compound obtained by dehydration is immersed in a condensed phosphate solution, dehydrated, and then rapidly heated by a known method to obtain condensed phosphate-containing expanded graphite.
これを公知の方法で加圧成形する方法である。This is a method of pressure molding using a known method.
第二の製造法では、得られる可撓性黒鉛材中の縮合リン
酸塩含有率を固形分で０．０５〜２重量％とすることが
好ましい。少ないと相手材の腐食を防止する効果が不充
分であり、可撓性黒鉛材表面に縮合リン酸塩が偏在した
り９機械的強度及び可撓性が低下する。In the second production method, it is preferable that the solid content of the condensed phosphate in the resulting flexible graphite material is 0.05 to 2% by weight. If it is too small, the effect of preventing corrosion of the mating material will be insufficient, condensed phosphates will be unevenly distributed on the surface of the flexible graphite material, and mechanical strength and flexibility will decrease.
（作用）
縮合リン酸塩の金属に対する防錆作用のメカニズムにつ
いては明確には解明されていないが、縮合リン酸塩が相
手材の金属表面に吸着され防食被膜を形成することによ
り防食効果を奏するものと考えられる。(Action) Although the mechanism of the anticorrosion effect of condensed phosphates on metals has not been clearly elucidated, the condensed phosphates are adsorbed onto the metal surface of the mating material and form an anticorrosion film, thereby exerting an anticorrosion effect. considered to be a thing.
（実施例） 以下実施例によシ本発明を説明する。(Example) The present invention will be explained below with reference to Examples.
実施例１
膨張黒鉛シート（日立化成工業株式会社製、商品名カー
ボフィット、板厚０．４＋ｍｎ、密度１．０９／ｃｍ＋
３）をテトラポリリン酸ナトリウム（燐化学工業株式会
社製）の２重量％水溶液中に２時間浸漬して含浸後、乾
燥機中で１５０℃、４時間乾燥し。Example 1 Expanded graphite sheet (manufactured by Hitachi Chemical Co., Ltd., trade name Carbofit, plate thickness 0.4+mn, density 1.09/cm+
3) was immersed in a 2% by weight aqueous solution of sodium tetrapolyphosphate (manufactured by Rin Kagaku Kogyo Co., Ltd.) for 2 hours to be impregnated, and then dried in a dryer at 150°C for 4 hours.
可撓性黒鉛材とした。なおテトラポリリン酸ナトリウム
の含有率は固形分で０．９重量％であった。Made of flexible graphite material. The content of sodium tetrapolyphosphate was 0.9% by weight in terms of solid content.
実施例２
実施例１と同一の膨張黒鉛シートをトリボＩＪ ＩＪン
酸ナトリウム（燐化学工業株式会社製）の５重量％水溶
液中に２時間浸漬して含没後、乾燥機中６一
で１５０℃で４時間乾燥し可撓性黒鉛材とした。Example 2 The same expanded graphite sheet as in Example 1 was immersed in a 5% by weight aqueous solution of tribo-IJ sodium phosphate (manufactured by Rin Kagaku Kogyo Co., Ltd.) for 2 hours, and then heated at 150°C in a dryer. The material was dried for 4 hours to obtain a flexible graphite material.
なおトリポリリン酸ナトリウムの含有率は固形分で２．
４重量％であった。The content of sodium tripolyphosphate is 2.0% in terms of solid content.
It was 4% by weight.
実施例３
マダガスカル産麟状黒鉛を濃硫酸と濃硝酸との混液中に
１時間浸漬後水洗し、吸引濾過機で脱水して黒鉛層間化
合物を得た。この黒鉛層間化合物をテトラポリリン酸ナ
トリウム（燐化学工業株式会社製）の５重量％水溶液中
に１０分間浸漬後吸引ｒ過機で脱水し、更に乾燥機中で
１１０℃で１時間乾燥した。次いでこれを９００℃に急
熱してカサ密度０．００６９／印３の膨張黒鉛を得た。Example 3 Rinous graphite from Madagascar was immersed in a mixture of concentrated sulfuric acid and concentrated nitric acid for 1 hour, washed with water, and dehydrated using a suction filter to obtain a graphite intercalation compound. This graphite intercalation compound was immersed in a 5% by weight aqueous solution of sodium tetrapolyphosphate (manufactured by Rin Kagaku Kogyo Co., Ltd.) for 10 minutes, dehydrated using a suction filter, and further dried at 110° C. for 1 hour in a drier. Next, this was rapidly heated to 900° C. to obtain expanded graphite with a bulk density of 0.0069/mark 3.
この膨張黒鉛を加圧成形して板厚０．４ｍ、密度１．０
ｇ／ｃＩＩ＋３のシート状の可撓性黒鉛材を得た。この
材料のテトラポリリン酸ナトリウム含有率は固形分で０
．９重量％であった。This expanded graphite is pressure-molded to form a plate with a thickness of 0.4 m and a density of 1.0.
A sheet-like flexible graphite material of g/cII+3 was obtained. The sodium tetrapolyphosphate content of this material is 0 in terms of solid content.
．． It was 9% by weight.
実施例４
実施例３で得られた黒鉛層間化合物をトリポリリン酸す
） ＩＪウム（燐化学工業株式会社製）の５重量％水溶
液中に１０分間浸漬後吸引沢過して脱水し、以下実施例
３と同じ工程で板厚０．４ｍ＋＋＋、密度１．０ｇ／ｃ
ｍ３の可撓性黒鉛材を得た。この材料のトリポリリン酸
ナトリウム含有率は固形分で０．８重量％であった。Example 4 The graphite intercalation compound obtained in Example 3 was immersed in a 5% by weight aqueous solution of IJum (manufactured by Rin Kagaku Kogyo Co., Ltd.) for 10 minutes and dehydrated by suction filtration. Same process as 3, plate thickness 0.4m+++, density 1.0g/c
m3 of flexible graphite material was obtained. The sodium tripolyphosphate content of this material was 0.8% by weight solids.
（試験例及び試験結果）
実施例１及至４で得た可撓性黒鉛材及び比較例として実
施例１で用いた膨張黒鉛シートについて。(Test Examples and Test Results) Regarding the flexible graphite materials obtained in Examples 1 to 4 and the expanded graphite sheet used in Example 1 as a comparative example.
引張強さの測定及び金属に対する腐食性を見るため塩水
浸漬試験を行った。塩水浸漬試験は第１図に示すように
、試料１を金属板（ＳＵＳ−４３０）２と合わせて７ラ
ンジ３で挾持し、締付はトルク２０に９・印でポルト４
を締付けたものを容器５中の５重量％塩化ナトリウム水
溶液６に浸漬し、２５℃で２４時間保持後取出して金属
板２の表面の腐食程度を観察する方法によった。A salt water immersion test was conducted to measure tensile strength and to examine corrosivity to metals. In the salt water immersion test, as shown in Figure 1, the sample 1 is held together with the metal plate (SUS-430) 2 by the 7-lunge 3, and the tightening is done with a torque of 20 to a port 4 with a mark of 9.
The clamped metal plate 2 was immersed in a 5% by weight aqueous sodium chloride solution 6 in a container 5, held at 25°C for 24 hours, and then taken out to observe the degree of corrosion on the surface of the metal plate 2.
引張試験の結果は第１表に示すように実施例及び比較例
のものに引張強さ（ｋｇ／ａｎ” ）の差がなかった。As shown in Table 1, the results of the tensile test showed that there was no difference in tensile strength (kg/an'') between the Examples and Comparative Examples.
第１表
塩水浸漬試験における金属板２の外観は、比較例のもの
Ｆｉａ面全体に腐食及び孔食（部分的な腐食によシ孔が
あく現象）が広がっていたが、実施例１及び３のものは
表面が僅かに変色しているだけであシ、実施例２及び４
のものは表面に１箇所孔食が生じていた。Table 1: The appearance of the metal plate 2 in the salt water immersion test was that of the comparative example. Corrosion and pitting corrosion (a phenomenon in which holes were formed due to partial corrosion) had spread over the entire FIA surface; Examples 2 and 4 had only slight discoloration on the surface.
One piece had pitting corrosion on its surface.
（発明の効果）
本発明によれば、相手材の腐食を防止する可撓性黒鉛材
が得られ９例えばシール材として使用する場合に相手金
属表面の腐食を抑制して、長期間にわたシ良好なシール
性能を保持する。(Effects of the Invention) According to the present invention, a flexible graphite material that prevents corrosion of a mating material can be obtained;9 For example, when used as a sealing material, it suppresses corrosion of the mating metal surface and provides long-term durability. Maintain good sealing performance.
第１図は塩水浸漬試験の方法を示す概略図である。
符号の説明
１・・・試料 ２・・・金属板３・・・フ
ランジ ４・・・ボルト５・・・容器
６・・・塩化ナトリウム水溶液□、ｃ、１FIG. 1 is a schematic diagram showing the method of a salt water immersion test. Explanation of symbols 1... Sample 2... Metal plate 3... Flange 4... Bolt 5... Container
6... Sodium chloride aqueous solution □, c, 1
Claims (3)
撓性黒鉛材。1. A flexible graphite material made of an expanded graphite molded body containing condensed phosphate.
次いで乾燥することを特徴とする請求項１記載の可撓性
黒鉛材の製造法。2. An expanded graphite molded body is impregnated with a solution of condensed phosphate,
2. The method for producing a flexible graphite material according to claim 1, further comprising drying the material.
脱水し，次いでその黒鉛粉を縮合リン酸塩溶液に浸漬し
た後脱水，急熱して縮合リン酸塩含有膨張黒鉛を得，該
膨張黒鉛を加圧成形することを特徴とする請求項１記載
の可撓性黒鉛材の製造法。3. Graphite powder is immersed in a mixture of sulfuric acid and oxidizing agent, then washed with water.
2. The method of claim 1, wherein the graphite powder is dehydrated, and then the graphite powder is immersed in a condensed phosphate solution, followed by dehydration and rapid heating to obtain condensed phosphate-containing expanded graphite, and the expanded graphite is pressure-molded. Method for manufacturing flexible graphite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63233162A JPH01317168A (en) | 1988-03-22 | 1988-09-16 | Flexible graphite material and production thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-67582 | 1988-03-22 | ||
| JP6758288 | 1988-03-22 | ||
| JP63233162A JPH01317168A (en) | 1988-03-22 | 1988-09-16 | Flexible graphite material and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01317168A true JPH01317168A (en) | 1989-12-21 |
Family
ID=26408797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63233162A Pending JPH01317168A (en) | 1988-03-22 | 1988-09-16 | Flexible graphite material and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01317168A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998045223A1 (en) * | 1997-04-04 | 1998-10-15 | Ucar Carbon Technology Corporation | Oxidation and corrosion resistant flexible graphite composite sheet and method |
-
1988
- 1988-09-16 JP JP63233162A patent/JPH01317168A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998045223A1 (en) * | 1997-04-04 | 1998-10-15 | Ucar Carbon Technology Corporation | Oxidation and corrosion resistant flexible graphite composite sheet and method |
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