1、Designation:D165211(Reapproved 2019)Standard Test Method forEpoxy Content of Epoxy Resins1This standard is issued under the fixed designation D1652;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in
2、 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 procedure for manual andautomatic t
3、itration of epoxy resins for the quantitative deter-mination of the percent epoxide content from 0.1 to 26%epoxide.1.2 The values stated in SI units 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 thesafet
4、y concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Section 6.1.4 This internation
5、al standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.
6、2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent Water2.2 Other Documents:OSHA Regulations,29 CFRparagraphs 1910.1000 and1910.120033.Summary of Test Method3.1 The resin is dissolved in a suitable solvent and theresulting solution is titrated with hydrogen bromide eitherdirec
7、tly or in situ.The hydrogen bromide reacts stoichiometri-cally with epoxy groups to form bromohydrins;therefore,thequantity of acid consumed is a measure of the epoxy content.3.1.1 In the Manual Titration Method,the titration is withstandard perchloric acid in the presence of an excess oftetraethyla
8、mmonium bromide.Hydrogen bromide generated insitu by the addition of perchloric acid to the quaternaryammonium halide rapidly opens the oxirane ring.3.1.2 In the Automatic Titration Method,the reaction ismeasuring the millivolt(MV)potential as perchloric acid isadded,which combines with the bromide
9、to form the hydro-bromic acid,which reacts with the epoxide group.As thereaction progresses,the potential will gradually increase untilthe reaction nears completion at which point the potentialincreases very quickly.The titrator measures the rate of thereaction by calculating the change in potential
10、 between per-chloric acid addition increments.When the change in potentialbegins to decrease,the titrator determines that the titration iscomplete.The epoxide content is calculated using the reagentfactor entered by the user during standardization,the weight ofthe sample,and the volume of perchloric
11、 acid added duringtitration.4.Significance and Use4.1 The epoxy content of epoxy resins is an importantvariable in determining their reactivity and the properties ofcoatings made from them.These test methods may be used todetermine the epoxy content of manufactured epoxy resins andconfirm the stated
12、 epoxy content of purchased epoxy resins.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where su
13、ch specifications are available.4Other grades may be1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.33 on Polymers and Resins.Current edition approved June 1,2019.Published J
14、une 2019.Originallyapproved in 1969.Last previous edition approved in 2011 as D1652 111.DOI:10.1520/D1652-11R19.2For 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 stand
15、ards Document Summary page onthe ASTM website.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.
16、For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization establ
