BS-7164-7.1-1990 ISO-5945-1989.pdf
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1、BRITISH STANDARD BS 7164-7.1: 1990 ISO 5945:1989 Chemical tests for raw and vulcanized rubber Part 7: Methods for determination of polymer content Section 7.1 Polyisoprene content Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:31:06 GMT+00:00 2006, Uncontrol
2、led Copy, (c) BSI BS 7164-7.1:1990 This British Standard, having been prepared under the direction of the Rubber Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1990 BSI 10-1999 The following BSI references relate to the work on
3、 this standard: Committee reference RUM/37 Draft for comment 90/40973 DC ISBN 0 580 18940 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Rubber Standards Policy Committee (RUM/-) to Technical Committee RUM/37, upon which the following
4、 bodies were represented: Institute of Water and Environmental Management Laboratory of the Government Chemist Ministry of Defence Royal Society of Chemistry Rubber and Plastics Research Association Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University,
5、 London South Bank University, Fri Dec 08 14:31:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-7.1:1990 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Principle1 4Reagents1 5Apparatus2 6Sampling2 7Procedure2 8Expression
6、of results3 9Test report4 Annex A (informative) Bibliography6 Figure 1 Digestion and distillation assembly5 Figure 2 Aeration assembly5 Table 1 Degree of interference of rubber compounding ingredients4 Table 2 Behaviour of rubber-like materials in chromic acid oxidation procedure4 Publication(s) ref
7、erred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:31:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-7.1:1990 ii BSI 10-1999 National foreword This Section of BS 7164 has been prepared under the direction of the Rubber Standards
8、Policy Committee and is identical with ISO 5945:1989 “Rubber Determination of polyisoprene content”, published by the International Organization for Standardization (ISO). BS 7164 rationalizes all the methods that deal with chemical analysis of raw, compounded and vulcanized rubber, some of which ha
9、ve previously been published in BS 903, BS 1673 and BS 5923. Relevant Parts of those standards will be withdrawn or deleted by amendment, as appropriate, when superseded by Parts and Sections of BS 7164. This Part of BS 7164 supersedes section 1 of Part B12 of BS 903-B11 and B12:1960 which is delete
10、d by amendment. Annex A of this standard is for information only. The Technical Committee has reviewed the provisions of ISO 1407:1976, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this British Standard. It is envisaged that the revised
11、 edition of ISO 14071) will be identical to BS 7164-3. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal
12、 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tabl
13、e on the inside front cover. Cross-references International StandardCorresponding British Standard BS 6057 Rubber latices ISO 123:1985Part 2:1987 Sampling (Identical) ISO 124:1985Section 3.2:1987 Determination of total solids content (Identical) ISO 1795:1974BS 6315:1982 Methods for sampling and sam
14、ple preparation of raw rubber (Technically equivalent) 1) In preparation. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:31:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-7.1:1990 BSI 10-19991 1 Scope 1.1 This International Standard specifies a method
15、 for the determination of polyisoprene occurring as natural isoprene rubber (NR)2), synthetic isoprene rubber (IR), balata and gutta percha, in the total solids from NR or IR latices, in solid raw rubbers, or in cured or uncured compounds. The method is applicable to these isoprene rubbers alone or
16、in blends. It cannot be used for hard rubber (ebonite) without modification. 1.2 Compounding ingredients, such as carbon black, mineral oil and sulfur, in soft rubbers do not interfere (see Table 1) (but see also 8.2). If vinyl acetate polymers are present, the method should not be used. 1.3 The met
17、hod is applicable to blends of the rubbers mentioned in 1.1 with SBR, BR and NBR. If halogenated rubbers are present, a slightly modified procedure, described in 7.7.3, is used. Some interference may be expected, because these rubbers react with chromic acid in a manner similar to polyisoprene. If t
18、hese interfering rubbers are the major part of the blend, they may impede the reaction of the polyisoprene with the chromic acid. The digestion shall then be checked for completeness on known mixtures of these interfering rubbers. Milling of the test portion as finely as possible is advisable. 1.4 T
19、he method may be used for the determination of polyisoprene in reclaimed rubbers, but it has been found to give consistently lower values than the previously accepted estimates for the polyisoprene content. 1.5 If rubbers other than those mentioned in 1.3 are present (CSM, EPDM, IIR, CIIR and BIIR),
20、 the digestion time shall be modified. The estimates shall be corrected by comparison with results from similar rubber blends. If these interfering rubbers are present in the blend, they may impede the reaction of the polyisoprene with the chromic acid and the method is not applicable. Greatest devi
21、ations are found if polysulfide rubbers are present as part of the mixture. (See Table 2.) 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated
22、 were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid Interna
23、tional Standards. ISO 123:1985, Rubber latex Sampling. ISO 124:1985, Rubber latices Determination of total solids content. ISO 1407:1976, Rubber Determination of solvent extract. ISO 1795:1974, Raw rubber in bales Sampling. 3 Principle Quantitative oxidation of the polyisoprene present in a test por
24、tion with a hot digestion mixture of sulfuric and chromic acids; distillation of the acetic acid formed, aeration of the distillate to remove carbon dioxide and titration of the acetic acid with sodium hydroxide solution. The calculation is based on the observation that a 75 % yield of acetic acid i
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