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1、BRITISH STANDARD BS 6057-3.16: 1990 ISO 2028:1989 Rubber latices Part 3: Methods of test Section 3.16 Preparation of dry polymer from synthetic latices NOTEAttention is drawn to BS 6057-0 “General introduction”, issued separately. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+0
2、0:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16:1990 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 31 August 1990 BSI 12-1999 First published July 1961 Second
3、 edition November 1970 Third edition May 1976 Fourth edition August 1990 The following BSI references relate to the work on this standard: Committee reference RUM/38 Draft announced in BSI News, December 1989 ISBN 0 580 18282 7 Committees responsible for this British Standard The preparation of this
4、 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 Manufacturers Association Malaysia Rubber Producers Research Association Medical Sterile Products Association Tropical Grow
5、ers Association Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16:1990 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Norma
6、tive reference1 3Principle1 4Reagents1 5Apparatus and material1 6Procedure1 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16:1990 ii BSI 12-1999 National foreword This Section of BS 605
7、7 has been prepared under the direction of the Rubber Standards Policy Committee and is identical with ISO 2028:1989 “Rubber Synthetic latices Preparation of dry polymer” published by the International Organization for Standardization (ISO). This section of BS 6057 supersedes 5.1 of BS 3397:1976, wh
8、ich will be deleted by amendment. 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-r
9、eference International StandardCorresponding British Standard ISO 124:1985 BS 6057 Rubber latices Section 3.2:1987 Determination of total solids content (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and
10、a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16
11、:1990 BSI 12-19991 1 Scope This International Standard specifies a method for the preparation, for subsequent testing (for example, for the determination of the Mooney viscosity), of dry polymer from anionic stabilized synthetic rubber latices having a volatile unsaturates content of less than 0,5 %
12、 (m/m). The method is suitable for a variety of latices, but its applicability should be confirmed for individual types. It should be noted that the dry polymer contains residual organic acids or soaps which may affect the properties of the polymer. This should be taken into account in the case of a
13、nalytical tests. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements
14、 based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 124:1985, Rubber latices Determination of total solids co
15、ntent. 3 Principle Coagulation of the latex by the addition of sodium chloride and sulfuric acid solutions, with fast agitation, in the presence of an antioxidant. Filtration and drying of the resultant crumb. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only
16、distilled water or water of equivalent purity. 4.1 Sodium chloride, 20 % (m/m) solution. 4.2 Antioxidant solution Prepare a 0,75 % (m/m) ethanolic solution of a bis-or polyphenol antioxidant which will prevent oxidation of the polymer during its preparation. 4.3 Sulfuric acid, diluted 1 + 9. Add 1 v
17、olume of concentrated sulfuric acid ( = 1,84 Mg/m3) to 9 volumes of water. 4.4 Congo red indicator paper 5 Apparatus and material 5.1 Combined high-speed mechanical stirrer and comminutor, with a totally enclosed motor, and with a stirrer vessel of capacity at least 1 000 cm3. 5.2 Drying tray, prefe
18、rably of stainless steel wire gauze. 5.3 Forced-draught oven, capable of being maintained at a temperature between 100 C and 125 C. 5.4 Cheesecloth 6 Procedure If the total solids content is not known, determine it in accordance with ISO 124. If the total solids content of the latex is greater than
19、30 % (m/m), dilute the latex with water to a total solids content of 30 % (m/m). To 250 cm3 of the latex contained in the stirrer vessel (see 5.1), add 50 cm3 of the sodium chloride solution (4.1) and mix thoroughly. With continuous stirring, add 250 cm3 of the antioxidant solution (4.2) and slowly
20、add, during 2 min to 3 min, 10 cm3 of the dilute sulfuric acid (4.3). Test with the indicator paper (4.4), and, if its colour does not change from red to blue, add additional dilute sulfuric acid, with stirring, until the colour does change. Pour the contents of the stirrer vessel on to the cheesecl
21、oth (5.4) and press as much liquid as possible from the crumb. Separate the mass of crumb by hand, wash it with a large volume of water until the washings are neutral to indicator paper (4.4), then transfer the pieces to the drying tray (5.2). Dry the crumb in the oven (5.3), maintained at between 1
22、00 C and 125 C, until the change in mass between two successive weighings at an interval of 2 min is less than 0,25 %. The drying time depends upon the consistency of the crumb, the properties of the polymer and the oven conditions, and shall be determined by experiment. Licensed Copy: sheffieldun s
23、heffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16:1990 BSI 12-1999 Publication(s) referred to See national foreword. Licensed Copy: sheffieldun
24、 sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.16: 1990 ISO 2028:1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on st
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33、or written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI