1、Designation:D172003(Reapproved 2012)Standard Test Method forDilution Ratio of Active Solvents in Cellulose NitrateSolutions1This standard is issued under the fixed designation D1720;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、 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 test method covers the d
3、etermination of the volumeratio of hydrocarbon diluent to active solvent required to causepersistent heterogeneity(precipitation)in a solution of cellu-lose nitrate.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The foll
4、owing applies to all specified limits in thisstandard;for purposes of determining conformance with thisstandard,an observed value or a calculated value shall berounded off“to the nearest unit”in the last right-hand digitused in expressing the specification limit,in accordance withthe rounding-off me
5、thod of Practice E29.1.4 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 practices and determine the applica-bility of regulatory limitations prior to u
6、se.For specific hazardstatements,see Section 6.1.5 For hazard information and guidance,see the suppliersMaterial Safety Data Sheet.2.Referenced Documents2.1 ASTM Standards:2D301 Test Methods for Soluble Cellulose Nitrate(With-drawn 2011)3D841 Specification for Nitration Grade TolueneD4615 Specificat
7、ion forn-Butyl Acetate(All Grades)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 dilution ratio,nthe maximum number of unit vol-umes of a diluent that can be added to a unit volum
8、e of solventto cause the first persistent heterogeneity(precipitation)in thesolution at a concentration of 8 g cellulose nitrate per 100 mLof combined solvent plus diluent and at a temperature of 25 63C.NOTE1The dilution ratio decreases as the cellulose nitrate concen-tration at the end point increa
9、ses.It is,therefore,necessary to set anarbitrary concentration of cellulose nitrate as part of the dilution ratioterm.For this purpose 8.0 g of cellulose nitrate per 100 mL of solvent plusdiluent has been adopted.4.Significance and Use4.1 By use of standard or reference grade materials for anytwo of
10、 the three components,namely,oxygenated solvent,diluent,or cellulose nitrate,the effect of different batches ordifferent types of the third component can be determined.4.2 This test method is applicable for the determination ofthe following:4.2.1 The dilution ratio of toluene as the standard diluent
11、 toan oxygenated solvent under test,using as the solute standardcellulose nitrate as defined in 5.2.4.2.2 The dilution ratio of a hydrocarbon diluent under testto n-butyl acetate as the standard solvent,using as a solutestandard cellulose nitrate as defined in 5.2.4.2.3 The dilution ratio of toluene
12、,as the standard diluent,ton-butyl acetate as the standard solvent,using as the solutecellulose nitrate of varying solubility characteristics.4.3 The information developed through this test may beuseful in the formulation of cellulose-based lacquers andadhesives.5.Materials5.1 n-Butyl Acetate(90 to
13、92%),conforming to Specifica-tion D4615.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.35 on Solvents,Plasticizers,and Chemical Intermediates.Current edition approved Nov.1,
14、2012.Published November 2012.Originallyapproved in 1960.Last previous edition approved in 2008 as D1720 03(2008).DOI:10.1520/D1720-03R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume infor
15、mation,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken
16、,PA 19428-2959.United States1 NOTE2This grade of n-butyl acetate contains 8 to 10%n-butylalcohol.5.2 Cellulose Nitrate,conforming to the Sampling section(Appearance,Ash,and Stability requirements)of Test MethodsD301 and of such quality that,when used in determining thetoluene dilution ratios of n-butyl acetate and methyl n-propylketone,it will give results between the following limits:Toluene Dilution Ration-butyl acetatemethyl n-propyl ketone2.73 to 2.833.80 to 3.905.3 Toluene(Toluol),conformin
