CN105129773A - Sulfhydrylation modified graphite particles and preparation method and application thereof - Google Patents
Sulfhydrylation modified graphite particles and preparation method and application thereof Download PDFInfo
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- CN105129773A CN105129773A CN201510389116.3A CN201510389116A CN105129773A CN 105129773 A CN105129773 A CN 105129773A CN 201510389116 A CN201510389116 A CN 201510389116A CN 105129773 A CN105129773 A CN 105129773A
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Abstract
The invention relates to sulfhydrylation modified graphite particles and a preparation method and application thereof. The method comprises the following steps: 1) cleaning the surfaces of graphite particles, pumping-filtering and drying the graphite particles; 2) placing the graphite particles obtained in step 1) in a mixed solution of water and ethanol, and adding silane coupling agents and catalysts; 3) controlling the temperature for sulfhydrylation modification reaction, then pumping-filtering, washing and drying the graphite particles to obtain the sulfhydrylation modified graphite particles. The sulfhydrylation modified graphite particles have the following advantages: 1, the particles prepared by the method has a dense and continuous silver shell and a low silver content; and 2, the preparation method has advantages of a simple process and a low cost, and can be generalized.
Description
Technical field
The present invention relates to conduction and electromagnetic shielding composite material field, particularly relate to graphite particle of a kind of sulfhydrylation modification and its preparation method and application.
Background technology
Surface contracted payment Core-shell Composite Particles filler can overcome traditional single component metal filler (such as: silver, copper and nickel etc.) have that density is large, cost is high and difficulty in problems such as polymeric matrix poor compatibility, therefore to be widely used in conduction and electromagnetic protection matrix material.Because silver-colored bag graphite Core-shell Composite Particles has the good characteristic of graphite and silver concurrently, therefore to be considered in surperficial contracted payment Core-shell Composite Particles filler most one of functional particles with application potential.Such as: graphite particle has good conduction, heat conductivility, and light weight (density is about 2.0g/cm
3), (40 ~ 100 yuan/kilogram) with low cost; Silver has optimum conductivity and chemical stability.In addition, sheet natural graphite particle has shape anisotropy and radius-thickness ratio is large, makes kernel with it, the silver-colored bag graphite Core-shell Composite Particles of preparation in polymeric matrix comparatively Ball-type packing more easily form conductive network, therefore the volume specific resistance of its matrix material is lower, and percolation threshold is also lower.
At present, silver bag graphite Core-shell Composite Particles mainly adopts seed mediated growth method to prepare, as: " CN200610112780.4 " and " Electrolessplatingofsilverongraphitepowdersandthestudyof itsconductiveadhesive.InternationalJournalofAdhesion & Adhesives; 2007; 28,55-58. ".This method utilizes electrostatic absorption principle first precious metal ion to be adsorbed on the electronegative Graphite particle surfaces of band, then precious metal seed is gone out by reductive agent in-situ reducing, these precious metal seeds serve as the nucleation centre of silver-colored nucleus in liquid phase chemical reduction silver process, finally obtain silver-colored bag graphite Core-shell Composite Particles.In addition, investigator is also had to utilize seed mediated growth method to deposit one deck active metal (as: copper or nickel) at Graphite particle surfaces in advance, and then prepare silver-colored bag graphite Core-shell Composite Particles by substitution method, as: " Geng Huanran; Tang Jiaoning, Zhang Jianbo, the etal. electrically conductive ink development [J] of silvering graphite powder. plating and covering with paint; 2013, (03): 30-32 ".But, the problem such as there is loose silver in the product that these preparation methods obtain and shell is not fine and close.This mainly because the active group of Graphite particle surfaces is few, easily produces from phase nucleation in the process of chemical reduction silver.In order to solve the problem, people adopt strong acid oxidation style to obtain graphite oxide, to improve the density of the active group (hydroxyl and carboxyl etc.) of graphite surface, silver-colored bag graphite Core-shell Composite Particles is prepared again afterwards by seed growth and chemical reduction money footwork, as: " Electrolessdepositionofsilverparticlesongraphitenanoshee ts.ScriptaMaterialia, 2008, 59 (10): 1031-1034 " and " Electricallyconductiveadhesivebasedonacrylateresinfilled withsilverplatinggraphitenanosheet.SyntheticMetals, 2011, 161 (5-6): 516-522 ".Although the silver-colored shell compactness of the product that this method obtains increases, the problems referred to above are effectively solved not yet, and simultaneously because oxidation style can make the specific surface area of graphite become large, this can increase the silver content of composite particles, increases its density." Study of New Method " national polymer material science engineering in 2010 symposial " 2010,630-631. of graphite chemical silvering " that the people such as Du Weiwei propose.Its preparation method carries out Dopamine HCL modification to Graphite particle surfaces, realized in-situ chemical reduction silver by the amino Adsorption For Ag ion on Dopamine HCL.Although solve the technical problem of silver-colored nucleus in Graphite particle surfaces orientated deposition, the Nucleation of silver-colored nucleus is not high, therefore composite particles still exists silver content this problem high; In addition, owing to will form Dopamine HCL polymeric layer at Graphite particle surfaces, therefore whole reaction time is longer, and cost is higher.
Therefore, how to obtain a kind of simple, effective technological approaches, to guarantee to prepare the thin and silver-colored shell of densification is coated graphite composite particles be this research field technical barrier urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Graphite particle surfaces sulfhydrylation modifying method and the application in preparation conduction and electromagnetic shielding filler thereof, solve low, the silver-colored nucleus of Graphite particle surfaces reactive behavior not easily nucleation, be difficult to prepare the coated graphite particle of dense thin silver shell.
The present invention solves the problems of the technologies described above adopted technical scheme, and a kind of Graphite particle surfaces sulfhydrylation modifying method, comprises the following steps:
1) flake graphite particle surface is cleaned, suction filtration, dry;
2) by step 1) gained graphite particle is placed in the mixing solutions of water and ethanol, and adds silane coupling agent and catalyzer;
3) control temperature of reaction and carry out sulfhydrylation modification, suction filtration, washing, drying obtain the graphite particle that sulfhydrylation is modified.
By such scheme, the volume ratio of water and ethanol is 0.02 ~ 2:1.
By such scheme, the volumetric concentration of silane coupling agent in mixing solutions is 0.5 ~ 10mL/L.
By such scheme, the volumetric concentration of catalyzer in mixing solutions is 1 ~ 200mL/L.
By such scheme, step 3) described in temperature of reaction be 50 ~ 85 DEG C.
By such scheme, silane coupling agent is γ-mercapto-propyl Trimethoxy silane or γ-mercapto-propyl triethoxyl silane.
By such scheme, described catalyzer is ammoniacal liquor, Tri N-Propyl Amine, piperidines or quadrol.
The graphite particle that above-mentioned any preparation method's gained sulfhydrylation is modified.
Present invention also offers a kind of application of graphite particle in the silver-colored bag graphite Core-shell Composite Particles of preparation obtained according to aforesaid method, above-mentioned graphite particle can be used as to prepare the starting material conducted electricity with electromagnetic shielding filler.
The present invention compared with prior art has following major advantage:
1. adopt the composite particles silver shell prepared in this way continuously fine and close, silver content is low.The volume specific resistance of this Core-shell Composite Particles is 5.86 × 10
-5Ω cm; When the packing volume mark of this composite particles is 25%, the volume specific resistance of its epoxide resin conductive adhesive is 5.94 × 10
-3Ω cm.Its principle be one be natural flake graphite particle surface hydroxyl with hydrolysis after silane coupling agent on silicone hydroxyl dehydrating condensation, two is under the effect of catalyzer, free silane coupling agent can react with the silicone hydroxyl of Graphite particle surfaces again further, accelerate between silane coupled agent molecule from condensation, finally the Graphite particle surfaces of low hydroxy density realize high sulfhydrylation modify.These high-density sulfydryls effectively can increase the Nucleation of silver-colored nucleus in liquid phase chemical reduction silver process, are beneficial to and realize fine and close coated thin silver-colored shell at Graphite particle surfaces.
2. preparation technology of the present invention is simple, and cost is low, easy to utilize.
Accompanying drawing explanation
X-ray photoelectron energy spectrogram a) the full spectrogram of the thiolated modified rear graphite particle of Fig. 1 embodiment of the present invention 1; B) S2p high resolution spectrogram;
The XRD spectra of the silver-colored bag graphite composite particles that Fig. 2 embodiment of the present invention 1 is synthesized;
The SEM photo of Fig. 3 natural flake graphite particle;
The SEM photo of the graphiteAg composite particles that Fig. 4 embodiment of the present invention 1 is synthesized;
The high power SEM photo of the graphiteAg composite particles that Fig. 5 embodiment of the present invention 1 is synthesized;
The SEM photo of the graphiteAg composite particles of the 2-in-1 one-tenth of Fig. 6 embodiment of the present invention;
The SEM photo of the graphiteAg composite particles that Fig. 7 embodiment of the present invention 3 is synthesized;
The SEM photo of the graphiteAg composite particles that Fig. 8 embodiment of the present invention 4 is synthesized;
The SEM photo of the graphiteAg composite particles that Fig. 9 embodiment of the present invention 5 is synthesized;
The SEM photo of the graphiteAg composite particles that Figure 10 embodiment of the present invention 6 is synthesized;
The SEM photo of the graphiteAg composite particles that Figure 11 embodiment of the present invention 7 is synthesized;
The SEM photo of the graphiteAg composite particles that Figure 12 embodiment of the present invention 8 is synthesized;
The SEM photo of the graphiteAg composite particles that Figure 13 embodiment of the present invention 9 is synthesized;
The SEM photo of the graphiteAg composite particles that Figure 14 embodiment of the present invention 10 is synthesized.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but do not limit the present invention.
Embodiment 1
Cleaning step: the greasy dirt (as: diesel oil, plant wet goods) effectively being removed Graphite particle surfaces by apparatus,Soxhlet's.Be that the mixed solvent 100mL of the water/ethanol of 1:1 pours in apparatus,Soxhlet's round-bottomed flask by volume ratio, then by coated for 30g graphite particle filter paper, be placed in this apparatus,Soxhlet's, backflow 6h.Use ethanol purge afterwards 3 times, suction filtration, be placed in 60 DEG C of baking ovens and dry 2h, stand-by;
Thiolated modified: to take 2.5g graphite particle and be placed in there-necked flask, pour 18mL deionized water and 82mL ethanol (volume ratio is 0.22:1) successively into, magnetic agitation, treats that temperature rises to 60 DEG C, add γ-mercapto-propyl Trimethoxy silane and ammoniacal liquor respectively, guarantee that both concentration is respectively 5mL/L and 20mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h, stand-by;
Liquid phase chemical reduction silver: 1, the preparation of silver-colored precursor solution, by a certain amount of AgNO
3be dissolved in deionized water, add ammoniacal liquor and stir and be made into silver ammino solution.Again a certain amount of NaOH is dissolved in deionized water, this sodium hydroxide solution is slowly poured in above-mentioned silver ammino solution, stir stand-by, wherein AgNO
3, NH
3h
2the mass percent of O and NaOH is respectively 3.40,4.48 and 2.00wt%.The preparation of reduced liquid, a certain amount of glucose and Seignette salt are dissolved in the mixing solutions of 500mL deionized water and 50mL dehydrated alcohol, be heated to boiling, and keep boiling state 5min, be cooled to room temperature stand-by, wherein the massfraction of glucose and Seignette salt is respectively 4.00 and 0.35wt%.In 100mL plastic beaker, successively add 0.2gPVP, graphite particle after 1.00g sulfhydrylation and 40mL reduced liquid, magnetic agitation evenly after, add 25mL silver precursor solution, after titration to drip speed for 1.50mL/min under room temperature, continue to react about 30min, the solid product obtained the most at last uses deionized water and ethanol purge 3 times respectively, and suction filtration is dry, is placed in 60 DEG C of dry 2h of baking oven;
As shown in Figure 1, the graphite particle after thiolated modified to the embodiment of the present invention 1 carries out X-ray photoelectron spectroscopic analysis (XPS).From full spectrogram, Graphite particle surfaces contains C, O, Si and S element.Simultaneously, the high resolution power spectrum of S element is analyzed, result shows that S element is divided into S2p1/2 (165.4eV) and S2p3/2 (164.2eV) two peaks, and the peak area of the two is 2:1, this show thiolated modified after Graphite particle surfaces on S element be exist with the form of sulfydryl;
Fig. 2 is the XRD spectra of the silver-colored bag graphite composite particles that the embodiment of the present invention 1 is synthesized.In XRD figure spectrum, locate (002) and (004) crystal face (JCPDSCardNo.08-0415) that two obvious diffraction peaks distinguish corresponding graphite for 26.4 ° and 54.5 °, and 38.1 °, 44.3 °, the diffraction peak corresponding face-centered cubic (fcc) is silver-colored respectively (111) at 64.5 ° and 77.4 ° places, (200), (220) and (311) crystal face (JCPDSCardNo.4-783).In collection of illustrative plates, do not have other diffraction peaks, this shows that the silver-colored shell that the Graphite particle surfaces that the embodiment of the present invention 1 is synthesized is formed is pure phase, inclusion-free;
Fig. 3 is the SEM photo of natural flake graphite particle, wherein shows particle dispersion even, but size heterogeneity, and natural graphite particle surface is coarse, has more tiny flaky texture.Fig. 4 and Fig. 5 is low power and the high power SEM photo of the graphiteAg composite particles that the embodiment of the present invention 1 is synthesized respectively.As can be seen from photo, this composite particles still has good dispersiveness, and its size is suitable with natural flake graphite particle.This illustrates that the silver-colored shell thickness of the composite particles that the embodiment of the present invention 1 is synthesized is thinner, and composite particles is not significantly reunited, without loose silver in product.
Embodiment 2
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 66mL deionized water and 33mL ethanol (volume ratio is 2:1) successively into, magnetic agitation, treats that temperature rises to 85 DEG C, adds γ-mercapto-propyl Trimethoxy silane and ammoniacal liquor respectively, guarantee that both concentration is respectively 10mL/L and 200mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in Figure 6, can find out that the surface topography of the graphiteAg composite particles of the 2-in-1 one-tenth of the embodiment of the present invention is consistent with the effect of embodiment 1.
Embodiment 3
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 2mL deionized water and 100mL ethanol (volume ratio is 0.02:1) successively into, magnetic agitation, treats that temperature rises to 60 DEG C, adds γ-mercapto-propyl Trimethoxy silane and ammoniacal liquor respectively, guarantee that both concentration is respectively 3mL/L and 1mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in Figure 7, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 3 is synthesized is consistent with the effect of embodiment 1.
Embodiment 4
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 30mL deionized water and 60mL ethanol (volume ratio is 0.5:1) successively into, magnetic agitation, treats that temperature rises to 50 DEG C, adds γ-mercapto-propyl Trimethoxy silane and piperidines respectively, guarantee that both concentration is respectively 0.5mL/L and 20mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in Figure 8, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 4 is synthesized is consistent with the effect of embodiment 1.
Embodiment 5
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 66mL deionized water and 33mL ethanol (volume ratio is 2:1) successively into, magnetic agitation, treats that temperature rises to 85 DEG C, adds γ-mercapto-propyl Trimethoxy silane and piperidines respectively, guarantee that both concentration is respectively 10mL/L and 200mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in Figure 9, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 5 is synthesized is consistent with the effect of embodiment 1.
Embodiment 6
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 40mL deionized water and 50mL ethanol (volume ratio is 0.8:1) successively into, magnetic agitation, treats that temperature rises to 50 DEG C, adds γ-mercapto-propyl triethoxyl silane and Tri N-Propyl Amine respectively, guarantee that both concentration is respectively 2mL/L and 4mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in Figure 10, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 6 is synthesized is consistent with the effect of embodiment 1.
Embodiment 7
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 36mL deionized water and 82mL ethanol (volume ratio is 0.44:1) successively into, magnetic agitation, treats that temperature rises to 60 DEG C, adds γ-mercapto-propyl triethoxyl silane and quadrol respectively, guarantee that both concentration is respectively 7mL/L and 100mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in figure 11, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 7 is synthesized is consistent with the effect of embodiment 1.
Embodiment 8
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 50mL deionized water and 50mL ethanol (volume ratio is 1:1) successively into, magnetic agitation, treats that temperature rises to 70 DEG C, adds γ-mercapto-propyl triethoxyl silane and Tri N-Propyl Amine respectively, guarantee that both concentration is respectively 8mL/L and 150mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in figure 12, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 8 is synthesized is consistent with the effect of embodiment 1.
Embodiment 9
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 54mL deionized water and 36mL ethanol (volume ratio is 1.5:1) successively into, magnetic agitation, treats that temperature rises to 75 DEG C, adds γ-mercapto-propyl triethoxyl silane and piperidines respectively, guarantee that both concentration is respectively 3mL/L and 175mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in figure 13, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 9 is synthesized is consistent with the effect of embodiment 1.
Embodiment 10
The cleaning of graphite particle and liquid phase chemical reduction silver are with embodiment 1.
Thiolated modified: to take 2.5g graphite and be placed in there-necked flask, pour 10mL deionized water, 100mL ethanol (volume ratio is 0.1:1) successively into, magnetic agitation, treat that temperature rises to 78 DEG C, add γ respectively--mercapto-propyl triethoxyl silane and quadrol, guarantee that both concentration is respectively 6mL/L and 40mL/L, and after reacting 6h at such a temperature, suction filtration, with washes of absolute alcohol, repeat 3 times, in 60 DEG C of baking ovens, dry 6h is stand-by.
As shown in figure 14, can find out that the surface topography of the graphiteAg composite particles that the embodiment of the present invention 10 is synthesized is consistent with the effect of embodiment 1.
Claims (9)
1. a Graphite particle surfaces sulfhydrylation modifying method, comprises the following steps:
1) flake graphite particle surface is cleaned, suction filtration, dry;
2) by step 1) gained graphite particle is placed in the mixing solutions of water and ethanol, and adds silane coupling agent and catalyzer;
3) control temperature of reaction and carry out sulfhydrylation modification, suction filtration, washing, drying obtain the graphite particle that sulfhydrylation is modified.
2. Graphite particle surfaces sulfhydrylation modifying method according to claim 1, is characterized in that the volume ratio of water and ethanol is 0.02 ~ 2:1.
3. Graphite particle surfaces sulfhydrylation modifying method according to claim 1, is characterized in that the volumetric concentration of silane coupling agent in mixing solutions is 0.5 ~ 10mL/L.
4. Graphite particle surfaces sulfhydrylation modifying method according to claim 1, is characterized in that the volumetric concentration of catalyzer in mixing solutions is 1 ~ 200mL/L.
5. Graphite particle surfaces sulfhydrylation modifying method according to claim 1, is characterized in that step 3) described in temperature of reaction be 50 ~ 85 DEG C.
6. the Graphite particle surfaces sulfhydrylation modifying method according to claim 1 or 3, is characterized in that silane coupling agent is γ-mercapto-propyl Trimethoxy silane or γ-mercapto-propyl triethoxyl silane.
7. the Graphite particle surfaces sulfhydrylation modifying method according to claim 1 or 4, is characterized in that described catalyzer is ammoniacal liquor, Tri N-Propyl Amine, piperidines or quadrol.
8. the graphite particle of any preparation method's gained of claim 1-7 sulfhydrylation modification.
9. the graphite particle of sulfhydrylation modification according to claim 8 is as the raw-material application of conduction with electromagnetic shielding filler.
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| CN108389645A (en) * | 2018-03-02 | 2018-08-10 | 华南理工大学 | A kind of preparation method of the liquid metal conductive filler based on liquid-solid two-phase structure |
| CN112708270A (en) * | 2021-02-01 | 2021-04-27 | 杭州本松新材料技术股份有限公司 | High-thermal-conductivity nylon-based composite material and preparation method thereof |
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| CN102417643A (en) * | 2011-10-17 | 2012-04-18 | 佛山市日丰企业有限公司 | Grapheme-containing reinforced wear-resistant material composition, reinforced wear-resistant material and preparation method thereof |
| CN102642830A (en) * | 2012-04-25 | 2012-08-22 | 南京大学 | Method for preparing graphene modified by silane coupling agent |
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| CN102417643A (en) * | 2011-10-17 | 2012-04-18 | 佛山市日丰企业有限公司 | Grapheme-containing reinforced wear-resistant material composition, reinforced wear-resistant material and preparation method thereof |
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| CN108389645A (en) * | 2018-03-02 | 2018-08-10 | 华南理工大学 | A kind of preparation method of the liquid metal conductive filler based on liquid-solid two-phase structure |
| CN112708270A (en) * | 2021-02-01 | 2021-04-27 | 杭州本松新材料技术股份有限公司 | High-thermal-conductivity nylon-based composite material and preparation method thereof |
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