BS-ISO-7781-2008.pdf
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1、BRITISH STANDARD BS ISO 7781:2008 Styrene-butadiene rubber, raw Determination of soap and organic-acid content ICS 83.040.10 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:07:31 MDTNo re
2、production or networking permitted without license from IHS -,-,- BS ISO 7781:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008 ISBN 978 0 580 58158 8 National foreword This British Standard is the UK implementation of
3、 ISO 7781:2008. It supersedes BS ISO 7781:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/23, Test methods for rubber and non-black compounding ingredients. A list of organizations represented on this committee can be obtained on request to i
4、ts secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copy
5、right British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:07:31 MDTNo reproduction or networking permitted without license from IHS -,-,- Reference number ISO 7781:2008(E) INTERNATIONAL STANDARD ISO 7781
6、 Fourth edition 2008-04-01 Styrene-butadiene rubber, raw Determination of soap and organic-acid content Caoutchouc butadine-styrne brut Dtermination de la teneur en savons et acides organiques BS ISO 7781:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrol
7、led Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:07:31 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/
8、14/2008 22:07:31 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Contents Page Foreword iv 1 Scope . 1 2 Normative references. 1 3 Principle. 1 4 Reagents 2 5 Apparatus 2 6 Sampling and sample preparation 3 7 Procedure 3 7.1 Preparation of the test solution. 3 7.2 Metho
9、d A: titration method using indicator reagent. 3 7.3 Method B: titration method using autotitrator or pH-meter . 4 8 Expression of results . 4 9 Test report . 6 Annex A (informative) Test for rosin 7 BS ISO 7781:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Un
10、controlled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:07:31 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
11、 The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-
12、governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part
13、2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a
14、 vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7781 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommitt
15、ee SC 2, Testing and analysis. This fourth edition cancels and replaces the third edition (ISO 7781:2001), which has been technically revised. BS ISO 7781:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Res
16、ale, 08/14/2008 22:07:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 Styrene-butadiene rubber, raw Determination of soap and organic-acid content WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does n
17、ot purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. WARNING Certain procedures specified in this International St
18、andard may involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This International Standard specifies methods for the determi
19、nation of the soap and organic-acid content of raw styrene-butadiene rubber (SBR). Method A is the titration method using indicator reagent. Method B is the titration method using an autotitrator or pH-meter. The methods depend on the extraction of the organic acids and soaps from the rubber by mean
20、s of a specified solvent. In practice, therefore, it is convenient to determine both organic-acid and soap contents on separate portions of the same solvent extract. Since the soaps and organic acids present in the rubber are not single chemical compounds, the method gives only an approximate value
21、for the soap and organic-acid content. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendmen
22、ts) applies. ISO 385, Laboratory glassware Burettes ISO 648, Laboratory glassware Single volume pipettes ISO 1042, Laboratory glassware One-mark volumetric flasks ISO 1795, Rubber, raw natural and raw synthetic Sampling and further preparative procedures ISO 4799, Laboratory glassware Condensers 3 P
23、rinciple A weighed test portion of the rubber, in the form of thin strips, is extracted using an ethanol-toluene azeotrope, or, for alum-coagulated rubber, using an ethanol-toluene-water mixture. After making up to a standard volume, an aliquot portion of the extract is withdrawn and titrated with s
24、tandard acid for the determination of soap and with standard alkali for the determination of organic acid. BS ISO 7781:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:07:31 MDTNo repro
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