1、Designation: D5805 00 (Reapproved 2014)Standard Test Methods forRubberDetermination of Carbon Black in Masterbatches1This standard is issued under the fixed designation D5805; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover the determination of theamount of carbon black in a masterbatch and cover emulsionSBR-ca
3、rbon black mixtures, but may be applicable to otherpolymers. Three test methods are included:SectionsInert Atmosphere Pyrolysis 310Vacuum Pyrolysis 1117Thermogravimetric Analyzer 1824NOTE 1The nomenclature used in these test methods is in accordancewith Practice D1418.1.2 The values stated in SI uni
4、ts are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health pra
5、ctices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1418 Practice for Rubber and Rubber LaticesNomenclatureD6370 Test Method for RubberCompositional Analysisby Thermogravimetry (TGA)TEST METHOD ACARBON BLACKInert Atmosphere Pyrol
6、ysis Test Method3. Summary of Test Method3.1 The prepared dried sample and a sample of standardSBR black determinate are tested in triplicate. The samples areweighed accurately into tared crucibles and then placed in acombustion tube at 550C, which is continuously flushed withCO2until the rubber hyd
7、rocarbon is distilled. The crucibles andcontents are cooled in a desiccator, weighed, then inserted intoa muffle furnace at 550C until all carbonaceous material isburned. The crucible and contents are again cooled in adesiccator and weighed. The percentage of carbon black iscalculated from the weigh
8、ts.4. Significance and Use4.1 The carbon black content of an unvulcanized black oroil-black SBR masterbatch may be determined by this testmethod if an inert (CO2) atmosphere and a determinate (seeNote 2) of known carbon black content are available.NOTE 2Determinate black masterbatch may be prepared
9、by carefuladdition of exact amounts of rubber and carbon black on a mill. Analternative would be a thorough blending of a quantity of black master-batch and determination of the carbon black by use of a previouslyestablished determinate.5. Apparatus5.1 Drying Oven.5.2 Porcelain Crucibles, No. 00000,
10、 tared.5.3 Weighing Bottles, tared.5.4 Fused Alumina Combustion Boats.35.5 Combustion Tubes.45.6 Combustion Furnace.6. Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents conform to the specifications of the Com
11、mittee onAnalytical Reagents of the American Chemical Society, where1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and are the direct responsibility of Subcommittee D11.11 on ChemicalAnalysis.Current edition approved Aug. 1, 2014. Published November 2014. Originallyapp
12、roved in 1995. Last previous edition approved in 2009 as D5805 00 (2009).DOI: 10.1520/D5805-00R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Docu
13、ment Summary page onthe ASTM website.3Alundum No. 3 combustion boats have been found satisfactory for this purpose.4The sole source of supply of the combustion tube known to the committee atthis time is the McDaniel high-temperature combustion tube, 30 in. (762 mm) longby 1 in. (25.4 mm) in diameter
14、 available from Dunlap and Co., 623 Staring Lane,Baton Rouge, LA 70810. This tube will accommodate a maximum of twocombustion boats containing six samples each within the heated area of the furnace.If you are aware of alternative suppliers, please provide this information to ASTMInternational Headqu
15、arters. Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1such specifications are available.5Other grades may be u
16、sed,provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.7. Preparation of Sample7.1 Blend 200 g of dried sample obtained in accordancewith 4.1 or 9.1 by passing it five times between the rolls of alabora
17、tory mill. Maintain the roll temperature at 50 6 5C (1226 9F) and a distance between the rolls of 0.5 6 0.13 mm(0.020 6 0.005 in.). After blending, sheet the sample from themill with the distance between the rolls set at 0.25 6 0.05 mm(0.010 6 0.002 in.). Dry approximately2goftheblended,thinly sheet
18、ed material for1hintheoven at 100 6 5C (2126 9F). Keep the dried sheet in a desiccator until ready toweigh the samples.8. Procedure8.1 Into the tared porcelain crucibles accurately weigh three0.3 to 0.5-g samples from the sheet of material being tested andthree 0.3 to 0.5-g samples from a similarly
19、prepared sheet ofstandard SBR black determinate (see Note 2). Due to thehygroscopic nature of the samples and the carbon black, weighthe crucibles and contents in the tared weighing bottles.8.2 Place the six crucibles in a fused alumina combustionboat, or boats, alternating the samples of determinat
20、e and thetest samples. Insert the combustion boat, or boats, into thecombustion tube. Pass a stream of oxygen-free CO2throughthe tube at a flow rate of 150 to 240 cm3(atmosphericpressure)/min. After the tube has been swept free of oxygen(approximately 5 min is sufficient time), place it in thecombus
21、tion furnace maintained at a temperature of 550 625C, and distill off the rubber hydrocarbon. Continue to passCO2through the tube, while allowing the tube to remain in thefurnace for 30 min. At the end of this period, remove thecombustion tube from the furnace and allow it to cool,meanwhile continui
22、ng the flow of CO2through it. When it iscool, remove the boat, or boats, and place the crucibles in adesiccator until they cool to room temperature and are ready tobe weighed. Accurately weigh the crucibles and contents.8.3 After weighing the crucibles containing the carbonblack residues, ignite the
23、 samples by either of the followingmethods:8.3.1 Place the crucibles and contents in a combustion boat,or boats, and insert them into a second combustion tube. Placethe tube in a combustion furnace maintained at 550 6 25Cand pass a stream of oxygen or air through the tube.8.3.2 Alternately, place th
24、e crucibles and contents in amuffle furnace maintained at 550 6 25C. After the carbon hasbeen completely burned, remove the boat, or boats, from themuffle furnace and place the crucibles in a desiccator. When thecrucibles have cooled to room temperature, weigh them.9. Calculation9.1 Calculate the pe
25、rcentage of ash, R, in the dry sample asfollows:R 5 F 2 E!/D 2 E!# 3100 (1)where:F = mass of crucible plus ash after ignition of the carbonblack, g,E = mass of crucible, g, andD = mass of original dry sample plus crucible, g.9.2 Calculate the individual values, c1, c2, and c3, for carbonblack conten
26、t of the material being tested on the dry, ash-freebasis as follows:c 5 100Q 2 F!/D 2 E!1 2 0.01R! (2)where:Q = mass of crucible and residue after distillation ofhydrocarbon, g, and F, D, E, and R are defined in 9.1.9.3 Calculate the individual values, c1, c2, and c3, forcarbon black content of the
27、standard SBR carbon blackdeterminate (see Note 2) on the dry, ash-free basis in accor-dance with 3.1.2, using the appropriate values obtained on thesamples of the determinate.9.4 Calculate the corrected percentage of carbon black inthe material being tested as follows:Carbon black, % 5 C1A 2 C (3)wh
28、ere:C = average of the three values of percentage carbon black(c1, c2, and c3) on the dry, ash-free basis, obtained onthe material being tested,A = percentage of carbon black assigned as the standardvalue for the standard SBR carbon black determinate(see Note 2), andC = average of the three values o
29、f percentage carbon black,c1, c2, and c3, on the dry, ash-free basis, obtained onthe standard carbon black determinate.10. Precision and Bias10.1 Precision and bias have not been determined.TEST METHOD BVacuum Pyrolysis Test Method11. Summary of Test Method11.1 The prepared dried sample is tested in
30、 triplicate. Thesamples accurately are weighed into tared crucibles and placedin a combustion tube and maintained under very low pressureat 600C until the rubber is distilled. The samples are cooledand returned to atmospheric pressure. The crucibles andcontents are then further cooled in a desiccato
31、r and weighed.The percentage of carbon black is calculated on an ash-freebasis.12. Significance and Use12.1 Carbon black in unvulcanized carbon black or oil-carbon black SBR masterbatch may be determined by this testmethod without the use of a determinate sample.5Reagent Chemicals, American Chemical
32、 Society Specifications, AmericanChemical Society, Washington, DC. For Suggestions on the testing of reagents notlisted by the American Chemical Society, see Annual Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharma
33、copeial Convention, Inc. (USPC), Rockville,MD.D5805 00 (2014)213. Apparatus13.1 Porcelain Crucible, No. 00000.13.2 Combustion Boats, sized to accommodate crucibles.13.3 Combustion Tube, high-silica (see Fig. 1).413.4 Combustion Furnace, capable of controlling tempera-ture at 600 6 25C.13.5 Vacuum Pu
34、mp.13.6 Vacuum Seal Lubricant for ground-glass joint.13.7 Muffle Furnace, capable of controlling at 550 6 25C.13.8 Drying Oven, capable of controlling at 105 6 5C.13.9 Insertion Rod.13.10 Trap, to condense vapors coming from combustiontube (see Fig. 1).14. Preparation of Sample14.1 Blend 200 g of th
35、e dried sample obtained in accor-dance with 4.1 or 9.1 by passing it five times between the rollsof a laboratory mill. Maintain the roll temperature at 50 6 5C(122 6 9F) and a distance between the rolls of 0.5 6 0.13 mm(0.20 6 0.005 in.). After blending, sheet the sample from themill with the distan
36、ce between the rolls set at 0.25 6 0.05 mm(0.010 6 0.002 in.). Dry approximately2goftheblended,thinly sheeted material for1hintheoven at 105 6 5C. Keepthe dried sheet in a desiccator until ready to weigh the samples.15. Procedure15.1 Place into a tared crucible 0.3 to 0.5 g (to the nearest0.1 mg) fr
37、om the sheet of material being tested. Using theinsertion rod, insert the boat containing the crucibles into thetube to maximum depth. Insert the ground-glass stopper coatedproperly with vacuum seal lubricant, turn on the vacuum pump,and evacuate the tube to less than 1.3 kPa.15.2 Introduce the comb
38、ustion tube into the combustionfurnace maintained at 600 6 25C, using care not to rotate thetube or otherwise cause sample disturbance. Allow the tube toremain in the furnace for 10 min, maintaining maximumpressure of 1.3 kPa (10 mm Hg) during combustion. Removethe tube from the furnace, allow the t
39、ube and contents to coolfor 7 min, and slowly allow pressure to increase to preventblowing residue out of crucible.15.3 Remove the boat and place it in a desiccator to cool toroom temperature. Weigh each crucible and residue to thenearest 0.1 mg. Determine the ash content on a portion ofsample.16. C
40、alculation16.1 Calculate the percentage of carbon black as follows:Carbon black, % 5 A 2 B! 2 0.01 CD!/C 2 0.01 CD! 3100 (4)where:A = mass of crucible and residue after distilling, g,B = mass of crucible, g,C = mass of original sample, g, andD = percentage of ash.17. Precision and Bias17.1 Precision
41、 and bias have not been determined.TEST METHOD CThermogravimetric Analyzer18. Summary of Test Method18.1 The prepared, dried sample is placed in a calibratedthermogravimetric analyzer (TGA) where it is weighed usingthe integral balance (See Test Method D6370). The sample isheated to 575C in an inert
42、 atmosphere to pyrolyze the rubberand other softeners. The atmosphere is then switched to air,FIG. 1 Vacuum Combustion Tube and Trap ArrangementD5805 00 (2014)3combusting the carbon black. The difference in mass beforeand after the switch of gases is the mass of the carbon blackcontained in the samp
43、le.19. Significance and Use19.1 The carbon black content of any vulcanized or unvul-canized compound may be determined by this method withoutuse of a determinate sample.19.2 Expertise in thermogravimetric analysis (TGA) is nec-essary to the successful application of this test method.20. Apparatus20.
44、1 Thermogravimetric Analyzer, maintained and operatedin accordance with manufacturers instructions.21. Preparation of Sample21.1 Blend 200 g of dried sample obtained in accordancewith 4.1 or 9.1 by passing it five times between the rolls of alaboratory mill. Maintain the roll temperature at 50 6 5C
45、(1226 9F) and a distance between the rolls of 0.5 6 0.13 mm(0.020 6 0.005 in.). After blending, sheet the sample from themill with the distance between the rolls set at 0.25 6 0.05 mm(0.010 6 0.002 in.). Dry approximately2goftheblended,thinly sheeted material for1hintheoven at 100 6 5C (2126 9F). Ke
46、ep the dried sheet in a desiccator until ready toweigh the samples.22. Procedure22.1 Set zero on the analyzer following manufacturersinstructions.22.2 Place in the instrument pan 10 6 3 mg of the preparedsample. Weigh accurately using integral instrument balance.22.3 Under inert atmosphere heat the
47、sample to 575 6 50Cand hold until constant mass.22.4 Switch atmosphere to air and hold until constant mass.23. Calculation23.1 Calculate the percentage of carbon black in thesamples as follows:C 5 A 2 B!100!/I (5)where:C = % carbon black in the sample,A = constant mass of sample at 575C under inert
48、gas,B = constant mass of sample at 575C under air, andI = initial mass of sample.23.2 Alternatively, the instrument may perform this calcu-lation automatically.24. Precision and Bias24.1 Precision and bias have not been determined.25. Keywords25.1 carbon black; masterbatch; thermogravimetric analysi
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