1、Designation:D255614Standard Test Method forApparent Viscosity of Adhesives Having Shear-Rate-Dependent Flow Properties Using Rotational Viscometry1This standard is issued under the fixed designation D2556;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he case of revision,the year 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This t
3、est method covers the measurement of the appar-ent viscosity of shear-rate-dependent adhesives using a rota-tional viscometer.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all o
4、f thesafety concerns,if any,associated with its use.It is theresponsibility 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 Documents2.1 ASTM Standards:2D907 Terminology of Adhesiv
5、es3.Terminology3.1 Definitions:3.1.1 Many terms in this test method are defined in Termi-nology D907.3.1.2 Newtonian behavior,nthe property of a liquid inwhich its viscosity is constant over a stated range of strainrates.(Compare non-Newtonian behavior.)3.1.3 non-Newtonian behavior,nthe property of
6、a liquidin which its viscosity is not constant over a stated range ofstrain rates.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent viscosity,nresistance to shear at a givenrate of shear,expressed as viscosity in mPas.NOTE1The SI unit of mPas is equivalent to cP.3.2.2 thixotropic ind
7、ex,nthe ratio of apparent viscositiesat two rotational speeds.4.Significance and Use4.1 The principle of measurement is based upon a reversibleisothermal change in apparent viscosity with change in rate ofshear produced by a change in rotational speed.4.2 Measurement is performed with a rotational v
8、iscometerunder standardized conditions with rigid control of the timeintervals of measurement.Viscosity readings are obtained atthe end of 1 min for each rotational speed.Changes from thelowest speed to the highest speed,and return to the lowestspeed,are made without stopping the instrument.5.Appara
9、tus5.1 Rotational ViscometerThe essential instrumentationrequired providing the minimum rotational viscometer analyti-cal capabilities include:5.1.1 A drive motor,to apply a unidirection rotationaldisplacement to the specimen at a rate of 0.2 revolutions perminute to 60 rev/min constant to within 61
10、%.5.1.2 Aforce sensor to measure the torque developed by thespecimen to within 61%.5.1.3 A coupling shaft or other means to transmit therotational displacement from the motor to the specimen.5.1.4 A spindle,geometry,tool,or rotational element to fixthe specimen between the drive shaft and a stationa
11、ry position.NOTE2Each rotational element typically covers a range of 1.5decades of viscosity.The rotational element may be a spindle,disk,T-bar,coaxial cylinder of other configuration selected by mutual agreementamong the parties involved.NOTE3Do not use a scored,warped,or otherwise damaged rotation
12、alelement.5.1.5 Aspecimen container with capacity to contain the testspecimen during testing.NOTE4The size of the container used is determined by the size anddesign of the rotational element used.The container used may be specifiedby mutual agreement among the parties involved.5.1.6 A guard to prote
13、ct the geometry from mechanicaldamage.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.10 on WorkingProperties.Current edition approved March 1,2014.Published March 2014.Originallyapproved in 1966.Last previous edition
14、 approved in 2011 as D2556 11.DOI:10.1520/D2556-14.2For 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 Document Summary page onthe ASTM website.Copyright ASTM
15、International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.7 A temperature sensor to provide an indication of thespecimen temperature in the range from 21 to 25C readable towithin 60.2C.NOTE5Other temperatures may be used but shall be reported.5.1.8 A data col
16、lection device to provide a means ofacquiring,storing and displaying measured or calculatedsignals,or both.The minimum output signals required forrotational viscometry are torque,rotational speed,temperatureand time.5.1.9 A stand to support,level,and adjust the height of thedrive motor,shaft and rotational element.5.1.10 Auxiliary instrumentation considered necessary oruseful in conducting this method includes:5.1.10.1 Data analysis capability to provide viscosity,stressor other useful parameter
