1、October 2007DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 87.060.20!$I%“1389202ww
2、w.din.deDDIN EN ISO 3681Binders for paints and varnishes Determination of saponification value Titrimetric method (ISO 3681:1996)English version of DIN EN ISO 3681:2007-10Bindemittel fr Beschichtungsstoffe Bestimmung der Verseifungszahl Titrimetrisches Verfahren (ISO 3681:1996)Englische Fassung DIN
3、EN ISO 3681:2007-10SupersedesDIN EN ISO 3681:1998-06www.beuth.deDocument comprises 11 pagesDIN EN ISO 3681:2007-10 2 National foreword This standard falls in the domain of Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germany). It is identical with International Standard I
4、SO 3681 which was prepared by Technical Committee ISO/TC 35/SC 10 “Test methods for binders for paints and varnishes” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials St
5、andards Committee), Technical Committee NA 002-00-02 AA Lackrohstoffe. When determining the saponification value of a resin solution in its as-supplied form, the saponification value of the solvent(s) might be included in the result. Because the extent to which this can be avoided depends heavily on
6、 the type of mixture, it is not possible to standardize a universally applicable procedure. A precise method would be the gas chromatographic determination of all solvents, for instance. As with the tritrimetric method specified here, the gas chromatographic method should be based on the use of a po
7、tassium hydroxide solution in ethanol: There has been much experience with this method, and many solvents, oils, simple alkyd resins, some unsaturated polyester resins, and some plasticizers (e.g. dioctylphthalate) will saponify very easily. Because of its high vapour pressure and possible toxicity,
8、 the use of a potassium hydroxide solution in methanol is not as advisable as using 2-propanol, which has a higher (e.g. alkyd resins on the basis of terephthalic acid and simple colophony resin esters) 2-propanol has a superior dissolving power that is at least equal to that of ethanol. In the case
9、 of materials that saponify with extreme difficulty, potassium hydroxide solutions in ethylene glycol ethers have proven useful because they have a greater stability than ethylene glycol (1,2-ethandiol) and have superior dissolving properties and greater miscibility. Often tertiary butyl alcohols pr
10、ove to be an even better choice. The saponification of polyacrylates that are saponifiable only with extreme difficulty, phenolic-resin-modified resin esters, and maleic resins is generally best achieved in autoclaves at temperatures of 120 C to 180 C. This is not the subject of this standard, but i
11、s subject to agreement only. The DIN Standards corresponding to the International Standards referred to in clause 2 of the EN are as follows: ISO 385-11)DIN EN ISO 385 ISO 648 DIN 12690 ISO 8422)DIN EN ISO 15528 ISO 3696 DIN ISO 3696 _ 1) ISO 385-1 has been revised and in April 2005 replaced by ISO
12、385. 2) ISO 842 has been revised and in August 2000 replaced by ISO 15528. constancy of properties than ethanol and methanol. In the case of materials that saponify with some difficulty DIN EN ISO 3681:2007-10 3 Amendments This standard differs from DIN EN ISO 3681:1998-06 as follows: The content ha
13、s been replaced by that in EN ISO 3681:1998. Extensive amendments were not necessary as the technical content of DIN 53401:1988-06 agreed with that of ISO 3681:1996. The equation in subclause 10.1 has been corrected. Previous editions DIN 53401: 1951x -11, 1967-05, 1968-07, 1975-11, 1988-06 DIN EN I
14、SO 3681:1998-06 National Annex NA (informative) Bibliography DIN 12690, Laboratory glassware One-mark pipettes, class A and class B DIN EN ISO 385, Laboratory glassware Burettes DIN EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling DIN ISO 3696, Water for analytical
15、 laboratory use Specification and test methods DIN EN ISO 3681:2007-10 4 This page is intentionally blank English versionICS 87.060.20Descriptors: Binders, paints, varnishes, saponification value, testing.Central Secretariat: rue de Stassart 36, B-1050 BrusselsEuropean Committee for StandardizationC
16、omit Europen de NormalisationEuropisches Komitee fr NormungBinders for paints and varnishesDetermination of saponification value Titrimetric method(ISO 3681 : 1996) 1998. CEN All rights of exploitation in any form and by any meansreserved worldwide for CEN national members.Ref. No. EN ISO 3681 : 199
17、8 ELiants pour peintures et vernis Dtermination de lindice de saponifi-cation Mthode titrimtrique(ISO 3681 : 1996)Bindemittel fr Beschichtungsstoffe Bestimmung der Verseifungszahl Titrimetrisches Verfahren(ISO 3681 : 1996)This European Standard was approved by CEN on 1998-03-09.CEN members are bound
18、 to comply with the CEN/CENELEC Internal Regulationswhich stipulate the conditions for giving this European Standard the status of anational standard without any alteration.Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central
19、 Secretariat or to anyCEN member.The European Standards exist in three official versions (English, French, German).A version in any other language made by translation under the responsibility of aCEN member into its own language and notified to the Central Secretariat has thesame status as the offic
20、ial versions.CEN members are the national standards bodies of Austria, Belgium, the CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland,and the United Kingdom.|April 1998EN ISO 3681ForewordInterna
21、tional Standardhas been adopted by Technical Committee CEN/TC 139 Paints and varnishes, the Secretariat of which is heldby DIN, as a European Standard.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, and conflicting
22、 national standards withdrawn, by October 1998 at the latest.In accordance with the CEN/CENELEC Internal Regulations, the national standards organizations of the follow-ing countries are bound to implement this European Standard:Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany
23、, Greece, Iceland, Ireland, Italy,Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.Endorsement noticeany modification.NOTE: Normative references to international publications are listed in Annex ZA (normative).EN ISO 3681:1998 (E) 2The text of the Int
24、ernational Standardwhich was prepared by ISO/TC 35 Paints and varnishes of the International Organization for Standardization,Binders for paints and varnishes Determination of saponification value Titrimetric method,ISO 3681:1996 was approved by CEN as a European Standard withoutISO 3681:1996EN ISO 3681:1998 (E) 3EN ISO 3681:1998 (E) 4EN ISO 3681:1998 (E) 5EN ISO 3681:1998 (E) 6EN ISO 3681:1998 (E) 7
