WO2005030675A1 - 炭化珪素質ハニカム構造体の製造方法及び炭化珪素質ハニカム構造体 - Google Patents
炭化珪素質ハニカム構造体の製造方法及び炭化珪素質ハニカム構造体 Download PDFInfo
- Publication number
- WO2005030675A1 WO2005030675A1 PCT/JP2004/014246 JP2004014246W WO2005030675A1 WO 2005030675 A1 WO2005030675 A1 WO 2005030675A1 JP 2004014246 W JP2004014246 W JP 2004014246W WO 2005030675 A1 WO2005030675 A1 WO 2005030675A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- silicon carbide
- honeycomb structure
- raw material
- based honeycomb
- kneading
- Prior art date
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 74
- 239000002994 raw material Substances 0.000 claims abstract description 42
- 238000004898 kneading Methods 0.000 claims abstract description 33
- 239000007858 starting material Substances 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims description 23
- 238000010298 pulverizing process Methods 0.000 claims description 16
- 239000002689 soil Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000007547 defect Effects 0.000 abstract description 6
- 239000011362 coarse particle Substances 0.000 abstract description 4
- 238000004904 shortening Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 21
- 239000011148 porous material Substances 0.000 description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 16
- 238000001035 drying Methods 0.000 description 15
- 238000013001 point bending Methods 0.000 description 15
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000011863 silicon-based powder Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 7
- 230000002776 aggregation Effects 0.000 description 6
- 229910052878 cordierite Inorganic materials 0.000 description 6
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000007847 structural defect Effects 0.000 description 4
- 235000005979 Citrus limon Nutrition 0.000 description 3
- 244000131522 Citrus pyriformis Species 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000011856 silicon-based particle Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C04B38/0006—Honeycomb structures
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to a method for manufacturing a silicon carbide-based honeycomb structure and a silicon carbide-based honeycomb structure.
- the present invention relates to a method for manufacturing a silicon carbide-based honeycomb structure and a silicon carbide-based honeycomb structure.
- Such a honeycomb structure has a plurality of cells penetrating in the axial direction partitioned by a porous partition wall.
- a ceramic raw material powder, a binder, water, and the like are kneaded.
- the obtained kneaded soil is extruded into a honeycomb shape by a continuous extruder to obtain a honeycomb formed body, and the honeycomb formed body is dried and fired to produce a honeycomb formed body.
- the recovered material derived from the starting material of the honeycomb structure generated in the manufacturing process of the honeycomb structure is used as the recycled material. It is preferable to reuse it for molding of molded products.
- an unfired regenerated raw material is pulverized to produce a pulverized material, and a pulverized material having a diameter of less than lmm is removed from the pulverized material to remove the remaining material.
- the product is manufactured using only the pulverized material, thereby suppressing an increase in the coefficient of thermal expansion.
- at least a part of the binder contained in the unfired regenerated raw material is removed by removing the regenerated raw material, thereby making it easy to pulverize and preventing the particles of the regenerated raw material from being deteriorated.
- the increase in the coefficient of thermal expansion is suppressed by pulverizing to a smaller size.
- Patent Document 1 Japanese Patent Publication No. 3-72032
- Patent Document 2 JP-A-8-119726
- Patent Document 3 JP-A-2000-302533
- a cordierite-based honeycomb structure relates to a cordierite-based honeycomb structure, but recently, a DPF or a honeycomb structure for a catalyst carrier has a silicon carbide-based honeycomb having excellent heat resistance.
- the use of structures is increasing.
- a silicon carbide-based honeycomb structure is prepared by adding metal silicon powder to silicon carbide powder as necessary, kneading the mixture with water and a binder, extruding the obtained kneaded soil into a honeycomb shape, drying the mixture, It is manufactured by firing.Since silicon carbide powder and metal silicon powder tend to agglomerate when they contain moisture, structural defects such as voids and coarse particles are generated, and strength and thermal conductivity are likely to decrease. There is a problem.
- An object of the present invention is to provide a method for manufacturing a silicon carbide honeycomb structure having excellent heat conduction.
- a recycled material which is generated from the starting material of the honeycomb structure generated in the process of manufacturing the silicon carbide-based honeycomb structure and is recovered, is used as a part of the starting material.
- a method for producing a silicon carbide-based honeycomb structure (first production method), wherein the recycled material is pulverized to an average particle size of 10 to 300 ⁇ m. Provided.
- an unmilled silicon carbide-based honeycomb structure and a new material are used as a starting material, and water is added thereto, and the mixture is kneaded while being pulverized.
- a method for manufacturing a silicon carbide-based honeycomb structure for manufacturing a silicon carbide-based honeycomb structure (second manufacturing method).
- the recovered material derived from the starting material of the silicon carbide based honeycomb structure generated in the process of manufacturing the silicon carbide based honeycomb structure that is, the material that has already been kneaded once is used as the raw material.
- the dispersibility of the silicon carbide powder and metal silicon powder in the raw material is improved, compared with the case where only the original starting material is used without using such a recovered material. Agglomeration of the powder is prevented.
- a silicon carbide honeycomb structure having excellent strength and uniform heat conduction, which are difficult to form structural defects such as voids and coarse particles, which have been a problem in manufacturing the silicon carbide honeycomb structure, has been developed. can get.
- the material that has already been kneaded is used as a part of the starting material, the kneading time can be shortened.
- the first manufacturing method of the present invention occurs during the manufacturing process of the silicon carbide honeycomb structure.
- the recovered material derived from the starting material of the honeycomb structure generated in the manufacturing process of the silicon carbide based honeycomb structure is, specifically, a deformed crack of a cell or the like during molding or drying.
- undried or dried compacts that are collected without becoming a product, or cutting allowances with kafune. These are made of a raw material that has already been kneaded once, and there are binders, pore formers, etc. around the raw material silicon carbide powder or metallic silicon powder, so that the powders are hard to agglomerate and become a state.
- dry pulverization method and a wet pulverization method as a method of pulverizing the recovered material.
- dry pulverization method include a method using a hammer mill, desinter, raymond mill, toothed roll crusher, corrugated roll crusher, impact crusher, and the like.
- the average particle size of the recycled material is 10 to 300 m.
- the recycled material as in the present invention is used, agglomeration is unlikely to occur, but if the recycled material has a large diameter exceeding 300 m, the strength of the recycled material at the boundary between the new material and the recycled material is high. Weak spots are generated, and as a result, the strength of the honeycomb structure is deteriorated.
- the recycled material is crushed to an average particle size of less than 10 m, the crushing efficiency will be poor and the cost will increase, but the wear of the crushing equipment will increase and the contamination with impurities may increase.
- a pulverized product pulverized by a sinterer, a Raymond mill, or the like may be used as it is, but by sieving and uniforming the particle size, the kneading property is increased and defects are reduced. be able to.
- the ratio of the recycled material to the entire starting material is preferably 50% by mass or less. If the proportion of the recycled material is more than 50% by mass, the plasticity of the kneaded soil (stroke) is reduced, and defects such as scratches and deformation are likely to occur during extrusion molding.
- the second production method of the present invention an unmilled silicon carbide-based honeycomb structure and a new material are used as starting materials, water is added thereto, and the mixture is kneaded while being pulverized.
- a new silicon carbide honeycomb structure is manufactured.
- the second production method also uses, as a part of the starting material, a raw material that has already been kneaded once, and has the same effect as the first production method.
- the unpulverized silicon carbide honeycomb structure is not pulverized before being mixed with the new raw material, but is wet-pulverized while being kneaded with the new raw material. Do.
- a method using a mixer is generally used.
- An example of a suitable mixer is an intensive mixer manufactured by Erich.
- a new raw material and an unmilled silicon carbide honeycomb structure are put into a pan, and an agitator is rotated to mix the new raw material while pulverizing the honeycomb structure.
- the honeycomb structure is formed by kneading the silicon carbide powder and auxiliary materials such as a binder, a pore former, and an auxiliary agent once, and molding the mixture. Aggregation of silicon carbide particles and metal silicon particles can be suppressed as in the case of mixing.
- a binder may be added in addition to water!
- the proportion of the unground silicon carbide honeycomb structure in the total starting materials is preferably 50% by mass or less. If the ratio of the unground silicon carbide honeycomb structure is more than 50% by mass, the plasticity of the kneaded soil (stroke) is reduced, and defects such as scratches and deformation are likely to occur during extrusion molding.
- the silicon carbide honeycomb structure of the present invention is manufactured by the first manufacturing method or the second manufacturing method, and has excellent strength and uniform heat conduction. It can be suitably used as a catalyst carrier for exhaust gas purification.
- Silicon carbide powder having an average particle size of 48 ⁇ m and metal silicon powder are mixed at a ratio of 80:20 (mass ratio), starch is added as a pore-forming material, and methylcellulose (binder) and surfactant are added.
- the auxiliaries, auxiliaries and water were added and kneaded using an eder.
- the binder was externally added at 10% by mass when the total amount of the silicon carbide powder and the metal silicon powder was 100% by mass.
- a honeycomb molded body was extruded from the obtained kneaded soil with an extruder, and was dried by microwave, and further dried with hot air at 120 ° C. for 30 minutes.
- the thus-obtained dried no-cams are coarsely pulverized using a Nommer, then finely pulverized by a desinter, and sieved through a 149-m diameter sieve to obtain particles having an average particle diameter of 50 m. This was used as a recycled material.
- the ratio of the recycled material to the new raw material obtained by mixing a silicon carbide powder having an average particle diameter of 48 ⁇ m and a metal silicon powder at a ratio of 80:20 (mass ratio) and the recycled material are described. And 10% by mass, 30% by mass, 50% by mass, 60% by mass, and 100% by mass (only recycled material), respectively. Then, methyl cellulose (binder), a surfactant, an auxiliary agent and water were added, and the mixture was kneaded using an eder. At this time, the amount of noinder added is as shown in Table 1, and the numerical values are shown by the external ratio to the recycled material.
- a honeycomb molded body was extruded from the kneaded soil with an extruder, dried by microwave, and further dried with hot air at 120 ° C. for 30 minutes. . After this drying, the obtained dried two-cam body is fired at 1450 ° C for 2 hours, and silicon carbide having an end face of 35 mm X 35 mm, a length of 254 mm, a partition wall thickness of 300 ⁇ m, and a cell density of 45 to 50 Zcm 2 is provided. A quality honeycomb structure was obtained.
- the porosity, average pore diameter, three-point bending strength, and thermal conductivity of the silicon carbide-based honeycomb structure thus obtained were measured.
- the porosity and average pore size were measured with a mercury porosimeter (Shimadzu Corporation AUTORORE), and the three-point bending strength was measured by cutting out a film surface of the honeycomb structure.
- the thermal conductivity was measured by a steady method (measuring device: GH-1S manufactured by ULVAC-RIKO).
- Example 1 Comparative Example 1 0 120 50 60 0 2.0 53 23.6 20.3 15.2 Example 1 10 120 50 40 3 2.1 54 23.5 25.1 18.1 Example 2 30 120 50 40 3 2.0 51 23.1 27.2 17.5 Example 3 50 120 Pinter 50 40 3 2.0 51 22.9 26.5 17.3 Example 4 60 120 Yuichi Deshin 50 40 3 1.6 52 23.2 26.4 17.8 Comparative Example 2 100 120 50 40 3 1.0 53 21.8 27.0 18.2
- a silicon carbide-based, two-cam structure was prepared in the same manner as in Examples 14 to 14 and Comparative Examples 1 and 2, except that the step of pulverizing the regenerated raw material was performed with a raymond mill instead of decinter.
- the results are as shown in Table 2.
- the results obtained with the use of a Raymond mill were almost the same as those obtained with the use of a sinter, and the use of recycled materials improved the dispersibility of silicon carbide powder and metal silicon powder. It is thought that there is. Also, when the proportion of the regenerated raw material exceeds 50% by mass, the plasticity of the kneaded soil is reduced as in the case of using a sinter.
- Example 5 (% By mass) ( ⁇ , ⁇ ) (MPa)
- Example 5 10
- Example 6 30
- Example 7 50
- Example 3 60
- Example 4 100 120 Raymond Mill 50 40 3 1.1 51 20.8 26.8 16.9
- Example 8 10 120 Raymond mill 50 40 0 52 22.1 26.9 17.3 Example 9 30 120 Raymond mill 50 40 0 52 22.0 27.1 17.8 Example 10 90 120 Raymond mill 50 40 0 53 23.1 25.0 17.4
- a silicon carbide honeycomb structure was prepared in the same manner as in Examples 5-7 and Comparative Examples 3 and 4, except that the kneading times of the regenerated raw material and the new raw material were set to 60 minutes, 30 minutes, and 20 minutes, respectively. Similarly, the porosity, the average pore diameter, the three-point bending strength, and the thermal conductivity were measured.
- Recycling experiments of recycled materials were conducted by changing the drying temperature when producing recycled materials within the range of room temperature-400 ° C.
- the drying time was 30 minutes, the proportion of the recycled material when mixing with the new raw material was 30% by mass, and as shown in Table 6, as the drying temperature increased, the amount of binder added when mixing with the new raw material was increased. Increased calories. This is because the higher the drying temperature at the time of producing the recycled material, the more easily the deterioration due to oxidation of the solder occurs, and it is necessary to compensate for the deterioration.
- the binder force added when producing the recycled material remained almost as it was, and a new binder was added.
- the zen was a powerful force. Except for the above conditions, a silicon carbide-based two-cam structure was prepared in the same manner as in Examples 5-7 and Comparative Examples 3 and 4, and the porosity, average pore diameter, three-point bending strength, and thermal conductivity were similarly calculated. The rate was measured. The results are as shown in Table 6, and there were no significant differences in the pore characteristics, strength, and thermal characteristics.
- Example 20 30 Room temperature Lemont's mill 50 40 0 52 22.5 26.2 18.2
- Example 21 30 200 Raymont's mill 50 40 2 54 23.4 25.4 18.1
- Example 22 30 300 Raymond's mill 50 40 3 51 21.9 25.1 17.8
- a kneaded soil (stroke) was further obtained through a kneading machine, and the kneaded soil (stroke) was obtained using the same in the same manner as in Examples 14 to 14 and Comparative Examples 1 and 2.
- honeycomb molded body before drying was obtained.
- Mixed I combined.
- the ratio of the honeycomb formed body in this mixture was set to 30% by mass. Since it is difficult to weigh an accurate amount of the honeycomb formed body alone, a coarsely pulverized honeycomb formed body is added to the mixture. It was adjusted. Water and a binder were added to these solid raw materials, and kneading was carried out while pulverizing with an intensive mixer manufactured by Eirich.
- the present invention relates to particulate matter contained in a dust-containing fluid such as diesel engine exhaust gas.
- the present invention can be suitably applied to the production of a filter (DPF) for trapping and removing quality and a catalyst carrier for supporting a catalyst component for purifying harmful substances in exhaust gas.
- DPF filter
- catalyst carrier for supporting a catalyst component for purifying harmful substances in exhaust gas.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/573,486 US7524450B2 (en) | 2003-09-30 | 2004-09-29 | Method for manufacturing silicon carbide based honeycomb structure and silicon carbide based honeycomb structure |
EP20040788312 EP1679294B1 (en) | 2003-09-30 | 2004-09-29 | Method for manufacturing silicon carbide based honeycomb structure and silicon carbide based honeycomb structure |
JP2005514251A JP4528263B2 (ja) | 2003-09-30 | 2004-09-29 | 炭化珪素質ハニカム構造体の製造方法及び炭化珪素質ハニカム構造体 |
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JP2003339743 | 2003-09-30 | ||
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US (2) | US7132066B2 (ja) |
EP (1) | EP1679294B1 (ja) |
JP (1) | JP4528263B2 (ja) |
KR (1) | KR100704221B1 (ja) |
CN (1) | CN1324226C (ja) |
BE (1) | BE1016207A3 (ja) |
DE (1) | DE102004043250B4 (ja) |
WO (1) | WO2005030675A1 (ja) |
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US7524450B2 (en) | 2003-09-30 | 2009-04-28 | Ngk Insulators, Ltd. | Method for manufacturing silicon carbide based honeycomb structure and silicon carbide based honeycomb structure |
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JP7153684B2 (ja) | 2020-03-25 | 2022-10-14 | 日本碍子株式会社 | 炭化珪素含有ハニカム構造体の製造方法 |
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JP4528263B2 (ja) | 2010-08-18 |
JPWO2005030675A1 (ja) | 2006-12-07 |
DE102004043250B4 (de) | 2016-07-28 |
US7132066B2 (en) | 2006-11-07 |
CN1324226C (zh) | 2007-07-04 |
US20070298958A1 (en) | 2007-12-27 |
US20050069675A1 (en) | 2005-03-31 |
BE1016207A3 (fr) | 2006-05-02 |
EP1679294B1 (en) | 2012-11-28 |
EP1679294A4 (en) | 2011-01-26 |
US7524450B2 (en) | 2009-04-28 |
DE102004043250A1 (de) | 2005-05-12 |
KR100704221B1 (ko) | 2007-04-09 |
EP1679294A1 (en) | 2006-07-12 |
KR20060096040A (ko) | 2006-09-05 |
CN1609417A (zh) | 2005-04-27 |
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