1、ASTM D3674 89-0759510 0533730 748=Designation:D 3674-89(Reapproved 1993)t1 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.Philadelphia,Pa 19103 Reprinted Irom the Annual Book of ASTM Standards.CopyrIght ASTM If not lIsted in the current combined index.will appear in the next edition Standar
2、d Test Method for Carbon Black-Relative Extrusion Mass This standard is issued under the fixed designation D 3674;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year o
3、f last reapproval.A superscript epsilon(t)indicates an editorial change since the last revision or reapproval.(I NOTE-Keywords were added editorially in December 1993.1.Scope 1.1 This test method covers the determination of the rela-tive extrusion mass of a carbon black sample compounded in a styren
4、e-butadiene rubber(SBR)compound recipe.A sam-ple of the current industry reference black(IRB)and the sample to be tested are both compounded and extruded in the same manner in accordance with Test Methods D 3 I9 1.The mass of a l-m(39.37in.)length extrusion of each sample is measured,and the relativ
5、e extrusion mass of the tested sample is expressed as a percent of the mass of the extrusion containing IRB.1.2 The values stated in SI units are to be regarded as the standard.The values in parentheses are for information only.1.3 This standard does not purport to address ail of the safety problems
6、,if any,associated with its use.It is the responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents 2.1 ASTM Standards:D 1799 Practice for Carbon Black-Sampling Pack
7、aged Shipments2 D 1900 Practice for Carbon Black-Sampling Bulk Shipment2 D3051 Practice for Carbon Black-Stating the Precision of ASTM Test Methods2 D 3 182 Practice for Rubber-Materials,Equipment,and Procedures for Mixing Standard Compounds and Pre-paring Standard Vulcanized Sheets2 D 3 19 1 Test M
8、ethods for Carbon Black Evaluation in SBR(Styrene-Butadiene Rubber)2 D 3396 Practice for Carbon Black-Measuring the Preci-sion of ASTM Test Methods2 3.Significance and Use 3.1 In practice,rubber compounds swell as they leave extrusion dies.For compounds differing only in the type of carbon black,the
9、 amount of swelling is influenced by the morphological characteristics of the carbon black.This test method permits a comparison of various samples of carbon black for these morphological characteristics.r This test method is under the jurisdiction of ASTM Committee D24 on Carbon Black and is the di
10、rect responsibility of Subcommittee D24.7 I on Methods of Testing Carbon Black in Rubber.Cumnt ed.ition approved Oct.-27,1989.Published December 1989.Originally published as D 3674-78.Last previous edition D 3674-88.2 Annual Book of ASTM Standards,Vol 09.0 I.4.Apparatus 4.1 Mixing Mill,as described
11、in Practice D 3 182.4.2 Extruder,screw-type,having a compression ratio of 1:1,with cylindrical extrusion die as shown in Fig.1.The distance between the end of the screw and the land of the die shall be from 1 to 2 times the diameter of the screw,and the ratio of the length to diameter of the screw s
12、hall be 5:l or greater.The use of breaker plates,screens,or spiders in the extruder is not recommended.4.2.1 The extruder shah be equipped with devices capable of monitoring the temperature of the barrel,the head,the discharged heating fluid from the screw,and the surface of the die.These monitoring
13、 devices shall have a sensitivity of 0S”C or less.4.3 Scale or Balance,500-g capacity,0.01-g sensitivity.4.4 Oven,gravity-convection type,capable of temperature regulation within+1C at 125C and temperature uniformity within+5C.4.5 Metal Cooling Table,approximately 0.8 m(30 in.)wide by 1.2 m(48 in.)l
14、ong,with a smooth,flat surface lightly dusted with zinc stearate or talc powder.4.6 Metre Stick or Jig,for measuring or cutting uniform I-m(39.37-m.)lengths,or both.4.7 Belt Conveyor,motor driven with a belt at least 150 mm(6 in.)wide and 1.5 m(5 ft)long,and variable in speed up to 75 mm/s(15 ft/min
15、).NOTE 1-It is not mandatory to use a belt conveyor to obtain reliable test data.5.Materials and Manufacture 5.1 The materials as described in Test Methods D 3 19 1 shall be used.5.2 The current lot of industry reference black shall be used in the standard compound.6.Sampling 6.1 Take samples in acc
16、ordance with Practices D 1799 and D 1900.7.Procedure 7.1 Prepare and mix the IRB and all carbon black samples in accordance with Practice D 3 182 and Test Methods D 3191.7.1.1 Cut the stock from the main batch into strips ap proximately as wide as the extruder feed hopper in accordance with Test Methods D 3 19 1.Cut enough stock to produce an extrusion approximately 4.5 m(15 ft)long,while maintaining a full extruder.7.2 Condition the stock for a minimum of 1 h and a 1 NOTICE:This standard has ei
