1、BRITISH STANDARD BS 6057-3.17: 1990 ISO 3136:1983 Rubber latices Part 3: Methods of test Section 3.17 Determination of bound styrene content of non-reinforced styrene butadiene rubber latices NOTEAttention is drawn to BS 6057-0 “General introduction”, issued separately.BS6057-3.17:1990 This British
2、Standard, having been prepared under the directionof the Rubber StandardsPolicy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 31 August 1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference RUM/38 Draft announce
3、d in BSI News July 1990 ISBN 0 580 18866 3 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/38, upon which the following bodies were represented: British Rubber Manufact
4、urers Association Malaysian Rubber Producers Research Association Medical Sterile Products Association Tropical Growers Association Amendments issued since publication Amd. No. Date CommentsBS6057-3.17:1990 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1
5、Scope and field of application 1 2 References 1 3 Principle 1 4 Reagents and apparatus 1 5 Sampling 1 6 Procedure 1 7 Expression of results 1 8 Test report 1 Publication(s) referred to Inside back coverBS6057-3.17:1990 ii BSI 12-1999 National foreword This Section ofBS6057 has been prepared under th
6、e direction of the Rubber Standards Policy Committee and is identical withISO3136:1983 “Rubber latex styrene-butadiene Determination of bound styrene content” published by the International Organization for Standardization (ISO). It supersedes clause8.1 ofBS3397:1976, which is deleted by amendment.
7、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 obligations. Cross-references International Standard C
8、orresponding British Standard ISO 123:1985 BS 6057 Rubber latices Part 2:1987 Sampling (Identical) ISO 2028:1989 Section 3.16:1990 Preparation of dry polymer from synthetic latices (Identical) ISO 2453:1975 BS 1673 Methods of test for raw rubber and unvulcanized compounded rubber Section 5.1:1963 Bo
9、und styrene content (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, 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
10、indicated in the amendment table on the inside front cover.BS6057-3.17:1990 BSI 12-1999 1 1 Scope and field of application This International Standard specifies a method for the determination of the bound styrene content of styrene-butadiene rubber (SBR) latices. The method is applicable to hot (app
11、roximately50 C) emulsion polymerized SBR latices having a bound styrene content, expressed on the SBR content, of up to55% and to cold (approximately5 C) emulsion polymerized SBR latices having a bound styrene content between18and40%. The method is not applicable to reinforced styrene-butadiene rubb
12、er (SBRY) latices, carboxylated-styrene-butadiene rubber (XSBR) latices and pyridine-styrene-butadiene rubber (PSBR) latices. 2 References ISO 123, Rubber latex Sampling. ISO 2028, Rubber Synthetic latices Preparation of dry polymer. ISO 2453, Styrene-butadiene copolymers Determination of bound styr
13、ene content. 3 Principle Conversion of the latex to a dry polymer which is extracted and pressed into a thin sheet. Calculation of the bound styrene content from the measured refractive index of this sheet. 4 Reagents and apparatus The reagents and apparatus specified inISO2028 andISO2453 are requir
14、ed. 5 Sampling Sampling shall be carried out in accordance with one of the methods specified inISO123. 6 Procedure In accordance withISO2028, coagulate the latex with sodium chloride and sulphuric acid in the presence of methanol and collect and dry the resultant crumb. In accordance withISO2453, sh
15、eet out the polymer, extract with ethanol-toluene azeotrope, dry, press into a thin sheet and determine the refractive index. 7 Expression of results Calculate the bound styrene content, as a percentage by mass of the SBR content of the latex, in accordance withISO2453. 8 Test report The test report
16、 shall include the following information: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operation not included in this International Standard, or regarded as optional.2 blankBS6057-3.17:1990 BSI 1
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