WO2004028967A1 - 耐熱性膨張黒鉛シート - Google Patents
耐熱性膨張黒鉛シート Download PDFInfo
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- WO2004028967A1 WO2004028967A1 PCT/JP2003/012256 JP0312256W WO2004028967A1 WO 2004028967 A1 WO2004028967 A1 WO 2004028967A1 JP 0312256 W JP0312256 W JP 0312256W WO 2004028967 A1 WO2004028967 A1 WO 2004028967A1
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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/22—Intercalation
- C01B32/225—Expansion; Exfoliation
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- 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
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/536—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite based on expanded graphite or complexed graphite
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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
- C09K21/00—Fireproofing materials
- C09K21/06—Organic materials
- C09K21/12—Organic materials containing phosphorus
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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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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
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
Definitions
- the present invention relates to a heat-resistant expanded graphite sheet, and more particularly to a heat-resistant expanded graphite sheet excellent in resistance to oxidation and consumption at high temperatures.
- the expanded graphite sheet is made of graphite such as natural graphite, cache graphite, pyrolytic graphite, etc., concentrated sulfuric acid, concentrated nitric acid, concentrated sulfuric acid and potassium chlorate, concentrated sulfuric acid and potassium nitrate, or excess graphite.
- a strong oxidizing agent such as hydrogen oxide or a halogenide such as bromine or aluminum chloride forms an intercalation compound, and the graphite particles having the intercalation compound formed thereon (Acid-treated graphite raw material) rapidly heated, for example
- Heat treatment is performed at a high temperature of more than 950 ° C for 1 to 10 seconds to generate decomposed gas, and the gas pressure expands the graphite layer to form expanded graphite particles.
- the expanded graphite sheet manufactured by compression molding or roll molding in the presence or absence of a binder does not have the heat resistance of graphite itself. It has excellent formability such as bending and compression molding due to its flexibility. For example, gaskets, sealings, heat insulators, cushions Wide field such as materials It is used in
- the expanded graphite particles forming the expanded graphite sheet have a low expansion rate of about 20 to 70 times and a high expansion rate of about 200 to 300 times. And are used. In the former case, in which expanded graphite particles having a low expansion ratio are used, the use of a binder is inevitably required to form a sheet, which leads to a decrease in the purity and physical properties of the expanded graphite sheet. You.
- the above-mentioned expanded graphite sheet especially expanded graphite sheets produced from expanded graphite particles having a high expansion ratio, have excellent physical properties, but are used in air. Therefore, when used in a high temperature range exceeding 700 ° C., there is a problem in heat resistance, and as a result, the so-called oxidative consumption rate, which causes the oxidative consumption of graphite, is reduced. It has the disadvantage of being expensive.
- the present invention has been made in view of the above-mentioned circumstances, and has a purpose of exhibiting an effect of suppressing the oxidation of graphite even in a high-temperature region exceeding 700 ° C.
- An object of the present invention is to provide a heat-resistant expanded graphite sheet having a high oxidation resistance.
- the heat-resistant expanded graphite sheet according to the first embodiment of the present invention contains an organic phosphorus compound dispersed in a ratio of 0.1 to 10% by weight.
- the heat resistance is imparted by the organic phosphorus compound dispersed and contained in the sheet, and the heat-resistant expanded graphite sheet has a temperature of 700 ° from room temperature. Even in a wide temperature range exceeding C, it has a high resistance to oxidation and consumption, and can be applied to various applications.
- the sheet since the sheet has various properties required for this type of expanded graphite sheet, for example, flexibility, workability, and the like, it can be shaped into a shape suitable for the intended use. It is possible.
- the amount of the organic phosphorus compound dispersed and contained in the sheet affects the heat resistance and the oxidative consumption rate of the sheet.
- the content of the organic phosphorus compound When the content of the organic phosphorus compound is less than 0.1% by weight, it does not sufficiently contribute to heat resistance, so that it is not possible to remarkably improve the oxidative wear resistance of the sheet, and the content is low. If it exceeds 10% by weight, no further improvement in heat resistance can be expected, and no effect can be seen in further improvement in the rate of oxidation and consumption resistance. On the other hand, if the content exceeds 10% by weight, the sheet tends to be hardened, and the oxidative consumption of the expanded graphite, which impairs the flexibility of the sheet, is preferred.
- the organic phosphorus compound to be reduced is reduced to an organic phosphonic acid and its ester, an organic phosphinic acid and its phosphite, like the heat-resistant expanded graphite sheet of the second embodiment of the present invention. It is selected from esterile, phosphite ester, phosphite ester and hypophosphite ester.
- organic phosphonic acid and its ester like the heat-resistant expanded graphite sheet of the third embodiment of the present invention, the following general formula:
- the organic phosphonic acid represented by (1) and its ester are preferably used.
- R ′ represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an alkylene having 1 to 10 carbon atoms.
- R 2 and R 3 are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, and an alkyl group having 6 to 18 carbon atoms and an aryl moiety having 6 to 18 carbon atoms.
- organic phosphinic acid and its ester examples include the organic phosphonic acid represented by the following general formula (2), such as the heat-resistant expanded graphite sheet according to the fourth embodiment of the present invention.
- the ester is preferably used.
- R 4 represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an alkylene portion having 1 to 10 carbon atoms and 6 to 1 carbon atoms.
- R 5 and R 6 are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, and an aryl group having 6 to 18 carbon atoms.
- a phosphate ester represented by the following general formula (3) is preferably used, such as the heat-resistant expanded graphite sheet according to the fifth embodiment of the present invention. .
- R 7 R 8 R 9 represents a hydrogen atom, an alkyl group having 110 carbon atoms, an aryl group having 6 18 carbon atoms or an alkylene portion having 110 carbon atoms. It is an aralkyl group consisting of an aryl moiety having 6 18 carbon atoms. However, except for all hydrogen atoms. ]
- the phosphite ester like the heat-resistant expanded graphite sheet of the sixth aspect of the present invention, the phosphite ester represented by the following general formula (4) and the following phosphite A phosphorous acid ester and a phosphorous acid monoester represented by the formula (5) are preferably used.
- R 'n R''R 1 2 is an alkyl group of 1 1 0 carbon atoms, alkyl of ⁇ rie group or carbon number 1 1 0 6 1 8 carbon atoms Ren and carbon number 6 18
- R 13 and R 14 are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms or It is an aralkyl group consisting of an alkylene portion having 1 to 10 carbon atoms and an aryl portion having 6 to 18 carbon atoms. However, this excludes the case where both R 1: i and R 14 are hydrogen atoms.
- hypophosphorous acid ester like the heat-resistant expanded graphite sheet of the seventh embodiment of the present invention, the hypophosphorous acid ester represented by the following general formula (6) is used. (Phosphonite) or a monophosphorous acid monoester represented by the following general formula (7) is preferably used.
- R '5 represents a hydrogen atom, an alkyl group having 1 to 1 0 carbon atoms, alkyl of ⁇ rie group or C 1 -C 1 0 of 6 to 1 to 8 carbon atoms Les emission portion and ⁇ aralkyl groups der whether et ing with ⁇ re Ichiru part of C 6 -C 1-8 Ri, R 1 B, R '7 , R 1 8 is an alkyl group having a carbon number of 1 to 1 0 , An aryl group having 6 to 18 carbon atoms or an alkylene portion having 1 to 10 carbon atoms and an alkylene group having 6 to 18 carbon atoms. This is an aralkyl group consisting of a reel part. ]
- FIG. 1 is a drawing showing an example of a test device for evaluating the flexibility of an expanded graphite sheet.
- BEST MODE FOR CARRYING OUT THE INVENTION A method for producing a heat-resistant expanded graphite sheet of the present invention will be described.
- the reaction solution is cooled and maintained at a temperature of 10; scaly natural graphite powder having a particle size of 30 to 80 mesh is added; and the reaction is carried out for 30 minutes.
- suction filtration and acid treatment The graphite is separated, and the washing operation of stirring the acid-treated graphite with water for 10 minutes and filtering by suction is repeated twice to sufficiently remove sulfuric acid from the acid-treated graphite.
- the acid-treated graphite from which sulfuric acid has been sufficiently removed is dried for 3 hours in a drying furnace maintained at a temperature of 110 ° C, and this is used as an acid-treated graphite raw material.
- While stirring the acid-treated graphite raw material a predetermined amount of a powder or solution of an organic phosphorus compound is blended with the acid-treated graphite raw material, and the mixture is uniformly stirred to obtain a mixture.
- This mixture is heated (expanded) for 1 to 10 seconds at a temperature of 950 to 1200 ° C to generate decomposition gas, and the gas pressure expands the graphite layer.
- expanded graphite particles expansion magnification: 200 to 300 times.
- the expanded graphite particles are supplied to a twin-roller device and roll-formed to produce a heat-resistant expanded graphite sheet having a desired thickness.
- the acid-treated graphite raw material is produced in the same manner as in the above-mentioned production method I.
- This acid-treated graphite raw material is heated (expanded) at a temperature of 95 to 1200 ° C. for 1 to 10 seconds to be decomposed.
- the gas is generated, and the graphite layer is expanded by the gas pressure to form expanded graphite particles (expansion ratio 200 to 300 times).
- a powder or solution of an organolin compound is blended into the expanded graphite particles thus obtained in a predetermined ratio, and the mixture is stirred uniformly to obtain a mixture.
- This mixture is supplied to a twin roller device to be roll-formed, and to have a desired thickness. Create a thermally expanded graphite sheet.
- the manufacturing method I and the heat-resistant expanded sheet manufactured by the method II contain a predetermined amount of an organic phosphorus compound and expanded graphite, and are flexible sheets.
- the organic phosphorus compound dispersed and contained in the heat-resistant expanded graphite sheet is expanded graphite of 700. It exhibits an effect of suppressing oxidative depletion at high temperatures exceeding c.
- the content of the organic phosphorus compound is 0.1 to 10% by weight, preferably 0.5 to 7.0% by weight.
- the content of the organic phosphorus compound affects the flexibility of the heat-resistant expanded graphite sheet, and if the content exceeds 10.0%, the sheet becomes hard, It shows a tendency to become brittle, which impairs the formability and additivity when forming into shapes etc. suitable for various uses. In addition, the content of the organic phosphorus compound is zero.
- the content is less than 1% by weight, it is difficult to sufficiently provide heat resistance, and the effect of suppressing oxidation at 3 ⁇ 4 ⁇ m is not sufficient.
- organic phosphorus compound examples include organic phosphonic acid and its ester, organic phosphinic acid and its ester, phosphoric acid ester, phosphorous acid ester and hypophosphorous acid ester. And the like.
- organic phosphonic acid and its ester are represented by the following general formula
- the organic phosphonic acid represented by (1) and its ester are preferably used. o
- R 1 is a carbon number: an alkyl group having L to 10; an aryl group having 6 to 18 carbon atoms; or an alkylene portion having 1 to 10 carbon atoms and a carbon atom having 6 to 10 carbon atoms.
- R 2 and R 3 are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, and an aryl group having 6 to 18 carbon atoms. It is an aralkyl group comprising an alkylene group having 1 to 10 carbon atoms, an aryl group having 6 18 carbon atoms, and a functional group.
- alkyl group a linear or branched alkyl group having preferably 1 to 10 carbon atoms, more preferably 1 to 6 ash groups (for example, a methyl group, an ethyl group) Butyl group, isopropyl group, n-butyl, sec-butyl group, tert-butyl group, etc.), and as the aryl group, preferably have 68 carbon atoms. And more preferably an aryl group having 6 to 10 ash atoms (for example, a phenyl group, a naphthyl group, an ethylphenyl group, a tolyl group, a xylyl group, etc.).
- the alkylene moiety is a straight-chain or branched-chain alkylene, preferably having 10 carbon atoms, and more preferably having 1 to 6 carbon atoms.
- the aryl part preferably has 6 to 18 carbon atoms, and more preferably has 6 to 18 carbon atoms. That (for example, base down Jill group, naphthyl Chirume ethyl group, etc.).
- Specific examples include methylphosphonic acid, ethylphosphonic acid, phenylphosphonic acid, triphenylphosphonic acid, benzylphosphonic acid, methylmethylphosphonate, and methylphosphonate. Examples thereof include dimethyl acid, diphenyl methylphosphonate, and dimethylphosphonate.
- organic phosphinic acid and its ester an organic phosphonic acid and its ester represented by the following general formula (2) are suitably used.
- R 4 is an alkyl group, an aryl group or an aralkyl group
- R 5 and R 6 are a hydrogen atom, an alkyl group, an aryl group or an aralkyl group. is there.
- the alkyl group, aryl group and aralkyl group are the same as above.
- methylphosphinic acid examples include methylphosphinic acid, ethylphosphinic acid, getylphosphinic acid, methylethylphosphinic acid, phenylphosphinic acid, methylphenylinylphosphinic acid, Examples include diphenylphosphinic acid, methylphosphinic acid ethyl, dimethylphosphinic acid ethyl, phenylphosphinic acid phenylylene, and phenylphosphinic acid ethyl.
- a phosphoric acid ester represented by the following general formula (3) is preferably used. o
- R 7 , R 8 and R 9 are a hydrogen atom, an alkyl group, an aryl group or an aralkyl group. However, except for the case of all hydrogen atoms.
- the alkyl group, aryl group and aralkyl group are the same as described above. Specific examples include methyl phosphate, butyl phosphate, phenyl phosphate, getyl phosphate, diphenyl phosphate, dibenzyl phosphate, trimethyl phosphate. And triphenyl phosphate, diphenyl phenyl phosphate, methyldiphenyl phosphate and the like.
- the phosphite ester include a phosphite ester represented by the following general formula (4), and a phosphite ester and a phosphite ester represented by the following general formula (5) Phosphate monoester is preferably used.
- R 10 , R 11 , and R 12 are an alkyl group, an aryl group or an aralkyl group
- R 13 and R 14 are hydrogen. It is an atom, an alkyl group, an aryl group or an aralkyl group.
- the alkyl group, aryl group and aralkyl group are the same as described above. Specific examples include trimethyl phosphite, triphenyl phosphite, getyl phosphite, diphenyl phosphite, butyl phosphite, and phenyl phosphite. Enyl and the like.
- Examples of the hypophosphite ester include hypophosphite diester (phosphonite) represented by the following general formula (6) or hypophosphorous acid represented by the following general formula (7) Monoester is preferably used.
- R '5 represents a hydrogen atom, an alkyl group ⁇ Ri rie group or ⁇ aralkyl group der
- R '6, R' 7 , R '8 is Ru alkyl group, ⁇ rie group or ⁇ aralkyl group der.
- alkyl group, aryl group and aralkyl group are the same as described above. Specific examples include dimethylphosphonite, diphenylphosphonite, dibenzylphosphonite, getylphenylphosphonite, methyl hypophosphite, methyl hypophosphite, ethyl hypophosphite, and phosphorous hypophosphite. Phenyl and the like.
- the expanded graphite sheet is composed of (1) 0.1% by weight of phenylphosphonic acid and expanded graphite.
- An acid-treated graphite raw material was produced in the same manner as in Example d. While stirring 100 parts by weight of the acid-treated graphite raw material, (9) 1.0 parts by weight of powder of dimethyl phosphonate as an organic phosphorus compound was added to the acid-treated graphite raw material. , (10) 2.0 parts by weight, (11) 4.2 parts by weight, and (12) 6.4 parts by weight, and uniformly mixed with stirring to obtain four types of mixtures. Each of these mixtures was heated at a temperature of 1000 ° C. for 5 seconds to generate a decomposed gas, and the gas pressure was used to expand the space between the graphite layers to increase the expansion ratio by 240 times. To obtain expanded graphite particles. In this expansion treatment step, dimethyl phenylphosphonate is dispersed and contained in the expanded graphite particles.
- the expanded graphite particles were passed through a rolling roll to form a mouth, and an expanded graphite sheet having a thickness of 0.38 mm was produced.
- the expanded graphite sheet produced in this manner contains (9) 1.0% by weight of getyl phenylphosphonate, 99.0% by weight of expanded graphite, and (10) getyl phenylphosphonate 2%. 0.08% by weight and expanded graphite 98.0% by weight, 4.0% by weight of (11) getyl phenylphosphonate and 96.0% by weight of expanded graphite, (12) Getyl phenylphosphonate 6.0% by weight and expanded black
- Example 13 containing 9400%
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring 100 parts by weight of the acid-treated graphite raw material, (13) 1.0 wt. Of a powder of diphenylphosphinic acid as an organic phosphorus compound was added to the acid-treated graphite raw material. Parts, (14) 2.0 parts by weight, (15) 4.2 parts by weight, and (16) 6.4 parts by weight, and uniformly stirred and mixed to obtain four types of mixtures. The mixture is subjected to a heat treatment at 100 ° C. for 5 seconds to generate a decomposition gas, and the gas pressure expands the graphite layer to expand 240 times as much. Graphite particles were obtained. In this expansion process, diphenylphosphinic acid is dispersed and contained in the expanded graphite particles.
- the expanded graphite particles were rolled through a rolling roll to form an expanded graphite sheet having a thickness of 0.38 mm.
- the expanded graphite sheet produced in this manner contains (13) diphenylphosphinic acid 1.0% by weight and expanded graphite 99.0% by weight (14) diphenylphosphonate. 2.0% by weight of fluoric acid and 98.0% by weight of expanded graphite, (15) 4.0% by weight of diphenylphosphinic acid and 96.0% by weight of expanded graphite, (16) It contains 6.0% by weight of phenylphosphinic acid and 94.0% by weight of expanded graphite. Examples 17 to 20
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring 100 parts by weight of the acid-treated graphite raw material, (17) 1.0 parts by weight of phenylphosphinic acid powder as an organic phosphorus compound was added to the acid-treated graphite raw material. , (18) 2.0 parts by weight,
- the expanded graphite particles were passed through a rolling roll to form a roll, thereby producing an expanded graphite sheet having a thickness of 0.38 mm.
- the expanded graphite sheet produced in this way contains (17) 1.0% by weight of phenylphosphinic acid and 99.0% by weight of expanded graphite,
- An acid-treated graphite raw material was produced in the same manner as in the previous example. While stirring 100 parts by weight of the acid-treated graphite raw material, a phosphoric acid ester as an organic phosphorus compound, specifically, a powder of diphenyl phosphinate was added to the acid-treated graphite raw material. 2 1) 1.0 parts by weight, (22) 2.0 parts by weight, (23) 4.2 parts by weight, (24) 6.4 parts by weight, and uniformly mixed with stirring to obtain 4 types Was obtained. These mixtures are heated at a temperature of 100 ° C. for 5 seconds to generate decomposed gas, and the gas pressure expands the graphite layer to expand the product by an expansion factor of 240 times. Graphite particles were obtained. In this expansion treatment step, diphenyl phosphate is dispersed and contained in the expanded graphite particles.
- the expanded graphite particles were passed through a rolling roll and roll-formed to produce an expanded graphite sheet having a thickness of 0.38 mm.
- the expanded graphite sheet produced in this way contains (21) 1.0% by weight of diphenyl phosphite, 99.0% by weight of expanded graphite, and (22) 2.0% by weight of phenyl and 98.0% by weight of expanded graphite, (23) 4.0% by weight of diphenyl phosphite and 96.0% by weight of expanded graphite, (24) Diphosphate It contains 6.0% by weight of phenyl and 94.0% by weight of expanded graphite.
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring the acid-treated graphite raw material (100 parts by weight), the acid-treated graphite raw material was added to a phosphorous ester as an organic phosphorus compound, and more specifically, to a phosphorous triflate. (25) 1.0 parts by weight, (26) 2.0 parts by weight, (27) 4.2 parts by weight,
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring 100 parts by weight of the acid-treated graphite raw material, the acid-treated graphite was stirred.
- a powder of hypophosphorous acid ester as an organic phosphorus compound, specifically, dimethylphosphonite (29) 1.0 part by weight, (30) 2.0 parts by weight, 3 1) 4.2 parts by weight,
- the expanded graphite particles were passed through a rolling roll to form a roll, thereby producing an expanded graphite sheet having a thickness of 0.38 mm.
- the expanded graphite sheet produced in this way contains (29) dimethylphosphonite (1.0% by weight), expanded graphite (99.0% by weight), and (30) dimethylphosphonite (2.0).
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring 100 parts by weight of the acid-treated graphite raw material, an 84% aqueous solution of orthophosphoric acid was added to the acid-treated graphite raw material (1) 0.3. 3 parts by weight, (2) 0.99 parts by weight, and (3) 1.66 parts by weight were blended in a spray form, and the mixture was stirred uniformly to prepare a wettable mixture.
- expanded graphite particles having an expansion ratio of 250 times were produced in the same manner as in the above-described embodiment, and an expanded graphite sheet having a thickness of 0.38 mm was produced in the same manner as in the above-described embodiment.
- the orthophosphoric acid mixed with the acid-treated graphite raw material generates a phosphorus pentoxide by a dehydration reaction in the expansion treatment step.
- the expanded graphite sheet produced in this manner is composed of (1) 0.2% by weight of phosphorus pentoxide and 99.8% by weight of expanded graphite,
- An acid-treated graphite raw material was produced in the same manner as in the above example. While stirring 100 parts by weight of the acid-treated graphite raw material, an aqueous solution of aluminum diphosphate having a concentration of 50% was added to the acid-treated graphite raw material.
- the HS test method for testing the oxidative depletion rate of the expanded graphite sheets obtained in Example 1 to Example 32 and Comparative Example 1 to Comparative Example 6 described above was performed using expanded graphite.
- the sheet was allowed to stand in air maintained at a temperature of 720 ° C. for 3 hours, and was represented by a weight loss rate (%) of the expanded graphite sheet. Further, the flexibility of the expanded graphite sheets obtained in Example 1 or Example 32 and Comparative Example 1 or Comparative Example 6 was tested.
- the test method is as follows: using the test equipment shown in Fig. 1, an expanded graphite sheet with a width of 100 mm and a length of 100 mm is alternately bent at an angle of 90 degrees until the sheet force is cut. The number is shown by the number of times.
- 1 is an expanded graphite sheet and 2 is
- Phenylenophosphonic acid 0.1 0.5 0.5 2.0 Weight loss rate (%) 1 3.0 1 2. 8 12. 6 10.5 Flexibility (times) Longitudinal direction 1 3 13 1 2 1 2 Width direction 23 22 22 2 1
- Dipheninolephosphinic acid 1.0 2.0 4.0 6.0 6.0 Weight loss (%) 1 2.0 1 1.2 10.8 1 1.7 Flexibility (times) Longitudinal 13 1 2 1 1 10 Width direction 21 21 20 2 ⁇
- Phenylenophosphinic acid 1.0 2.0 4.0 6.0 Weight loss rate (%) 1 3.0 1 1.4 1 1.0 1 2.0 Flexibility (times) Longitudinal 13 1 2 1 2 1 1 Width direction 22 21 20 20
- Weight loss rate (%) 1 3.0 1 1. 4 1 1. 0 1 2.0 Flexibility (times) Longitudinal direction 1 3 1 2 1 2 1 1 Width direction 22 21 20 20 20
- Phosphorous acid ester (phosphorous acid 1.0 2.0 4.00 6.0 triphenyl acid)
- Weight loss rate (%) 1 3. ⁇ 1 1. 6 1 1. 2 1 1. 8 Flexibility (times) Longitudinal direction 1 3 1 2 1 2 1 2 Width direction 21 22 20 20 20
- esthenol hypophosphite (dim 1.0 2.0 4.0 6.0 tyl phosphonite)
- Weight loss rate (%) 1 2. 8 1 1. 5 1 1. 2 1 2. 0 Flexibility (times) Longitudinal direction 1 2. 6 1 2 1 2 1 2 Width direction 21 20 20 20 20 20 20
- the heat-resistant expanded graphite sheet obtained in the Example was phenylphosphonic acid (Example 1) as an organic phosphorus compound in the sheet. 8), getyl phenylphosphonate (Examples 9 to 12), diphenylphosphinic acid (Examples 13 to 16), phenylphosphonate Phosphoric acid (Examples 17 to 20), ester of phosphoric acid (diphenyl phosphate: Examples 21 to 24), ester of phosphorous acid (phosphorous acid) Triphenyl acid: Example 25, No. 28) and ester hypophosphite (dimethylphosphonite: Examples 29 to 32) were dispersed and contained.
- the heat resistance is improved, and even at a temperature exceeding 700 ° C, the effect of high oxidation wear resistance is exhibited.
- they have equivalent properties without impairing the inherent properties such as flexibility.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2004539535A JP4506465B2 (ja) | 2002-09-26 | 2003-09-25 | 耐熱性膨張黒鉛シート |
EP03798498A EP1559680B1 (en) | 2002-09-26 | 2003-09-25 | Heat-resistant exfoliated graphite sheet |
US10/528,155 US7867615B2 (en) | 1920-09-26 | 2003-09-25 | Heat-resistant exfoliated graphite sheet |
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JP2002-280629 | 2002-09-26 | ||
JP2002280629 | 2002-09-26 |
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WO2004028967A1 true WO2004028967A1 (ja) | 2004-04-08 |
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US (1) | US7867615B2 (ja) |
EP (1) | EP1559680B1 (ja) |
JP (2) | JP4506465B2 (ja) |
CN (1) | CN100351175C (ja) |
WO (1) | WO2004028967A1 (ja) |
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JP2006064296A (ja) * | 2004-08-27 | 2006-03-09 | Sgl Carbon Ag | 膨張黒鉛から成る熱伝導板とその製造方法 |
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DE60332136D1 (de) * | 2002-10-08 | 2010-05-27 | Oiles Industry Co Ltd | Kugelzonenartiger dichtungskörper |
US8808850B2 (en) | 2011-10-25 | 2014-08-19 | Arclin | Water resistant intumescent fire retardant coating |
DE102015011952A1 (de) * | 2015-09-18 | 2017-03-23 | Sgl Carbon Se | Kathodenboden, Verfahren zur Herstellung eines Kathodenbodens und Verwendung desselben in einer Elektolysezelle zur Herstellung von Aluminium |
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Also Published As
Publication number | Publication date |
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JP4656250B2 (ja) | 2011-03-23 |
EP1559680B1 (en) | 2012-01-25 |
US20050253115A1 (en) | 2005-11-17 |
EP1559680A4 (en) | 2008-05-21 |
JPWO2004028967A1 (ja) | 2006-01-26 |
CN100351175C (zh) | 2007-11-28 |
CN1684907A (zh) | 2005-10-19 |
US7867615B2 (en) | 2011-01-11 |
JP2009286691A (ja) | 2009-12-10 |
EP1559680A1 (en) | 2005-08-03 |
JP4506465B2 (ja) | 2010-07-21 |
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