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1、BRITISH STANDARD BS 6057-3.14: 1987 ISO 2006:1985 Rubber latices Part 3: Methods of test Section 3.14 Determination of high-speed mechanical stability of synthetic rubber latices ISO title: Rubber latex, synthetic Determination of high-speed mechanical stability NOTEAttention is drawn to BS 6057-0 “
2、General introduction”, issued separately. UDC 678.031:531.36 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14:1987 This British Standard, having been prepared under the direction of the Rubber Standards Committee, was published u
3、nder the authority of the Board of BSI and comes into effect on 31 December 1987 BSI 10-1999 First published January 1984 First revision The Committees responsible for this British Standard are shown in Part 0. The following BSI references relate to the work on this standard: Committee reference RUM
4、/38 Draft (ref. 86/37224) announced in BSI News May 1987 ISBN 0 580 16165 X Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14:1987 BSI 10-1999i Contents Page Nation
5、al forewordii 1Scope and field of application1 2References1 3Principle1 4Reagent1 5Apparatus1 6Sampling2 7Procedure2 8Expression of results2 9Test report2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c)
6、BSI BS 6057-3.14:1987 ii BSI 10-1999 National foreword This Section of BS 6057 is identical with ISO 2006:1985 “Rubber latex, synthetic Determination of high-speed mechanical stability”, published by the International Organization for Standardization (ISO). It supersedes BS 6057-3.14:1984 which is w
7、ithdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the f
8、ollowing. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS 6057”. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. The Technical Com
9、mittee has reviewed the provisions of ISO 35:1982, referred to in clause 1, and has decided that they are acceptable for use in conjunction with this standard. Method B of BS 1672:1972 is related to ISO 35:1982 and will eventually be replaced by a new section of BS 6057-3; it is intended that the ne
10、w Section will be identical with a revision of ISO 35, due in 1988. Additional information. For information on the availability of suitable apparatus, apply to the Enquiry Section, BSI, Linford Wood, Milton Keynes, MK 14 6LE enclosing a stamped addressed envelope. NOTEIn clause 2, line 1 the followi
11、ng typographical error has been noticed; for “Ruber” read “Rubber”. 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 immuni
12、ty from legal obligations. Cross-references International StandardCorresponding British Standard BS 6057 Rubber latices ISO 123:1985Part 2:1987 Sampling (Identical) Part 3 Methods of test ISO 124:1985Section 3.2:1987 Determination of total solids content (Identical) ISO 1652:1985Section 3.11:1987 De
13、termination of viscosity of rubber latices (Technically equivalent) 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 a back cover. This standard has been updated (see copyright date) and may have had amendments inc
14、orporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14:1987 BSI 10-19991 1 Scope and field of application This International Standard specifies a metho
15、d for the determination of the high-speed mechanical stability of synthetic rubber latex. The stirring disk which is specified has a greater diameter than that specified for natural rubber latex concentrate in ISO 35, Rubber latex, natural Determination of mechanical stability. The test is applicabl
16、e to synthetic rubber latices which have a viscosity, determined with the L instrument in accordance with ISO 1652, of up to 200 mPas (200 cP). Latices of higher viscosity shall be tested after dilution to a viscosity of 200 mPas (200 cP) or less, provided that such dilution1) does not reduce the co
17、ncentration of the latex by more than 10 % (m/m) total solids. The duration of stirring shall be so selected that the latex does not increase in temperature to more than 60 C and does not exceed a height of 100 mm in the latex container. The duration of stirring shall be agreed between the intereste
18、d parties and shall not be longer than 30 min or less than 1 min. In the case of a latex which contains ammonia, the duration of stirring shall be limited, since loss of ammonia by evaporation during the test may cause additional destabilization. The test does not necessarily indicate the stability
19、of a synthetic rubber latex to high shear stress, for which a rubbing test may be more applicable. 2 References ISO 123, Ruber latex Sampling. ISO 124, Rubber latices Determination of total solids content. ISO 1652, Rubber latex Determination of viscosity. 3 Principle A test portion is stirred at hi
20、gh speed. The amount of coagulum formed is regarded as an inverse measure of the mechanical stability of the latex. 4 Reagent During the analysis, use only distilled water or water of equivalent purity. Soap solution, 5 % (m/m) solution of potassium oleate of pH value 10, or, for use with a latex wh
21、ich is coagulated by potassium oleate solution, 5 % (m/m) solution of a synthetic anionic or non-ionic surfactant. 5 Apparatus Ordinary laboratory apparatus and 5.1 Mechanical stability measuring apparatus2), consisting of the following items: 5.1.1 Latex container, flat-bottomed, cylindrical, at le
22、ast 100 mm high, with an internal diameter of 58 2 mm and a wall thickness of about 2,5 mm. The inner surface shall be smooth, and a glass container is preferred. 5.1.2 Stirring apparatus, consisting of a vertical stainless steel shaft of sufficient length to reach to the bottom of the latex contain
23、er (5.1.1) and tapering to approximately 6,3 mm diameter at its lower end, where is attached a horizontal, smooth, stainless steel disk 36,12 0,03 mm in diameter and 1,57 0,05 mm thick by means of a threaded stud at the exact centre of the disk. The apparatus shall maintain stirring at a rotational
24、frequency of 14 000 200 min1 (233 3 s1)3) throughout the test, at which frequency the shaft shall not run out of the true by more than 0,25 mm. 5.1.3 Holder for the latex container (5.1.1). The holding arrangement shall ensure that the axis of the rotating shaft is concentric with that of the latex
25、container and that the bottom of the stirring disk is 13 1 mm from the inner surface of the bottom of the latex container. 5.2 Preliminary filter, of stainless steel wire cloth with an average aperture width of 180 15 4m. 5.3 Test filter, consisting of a disk of stainless steel wire cloth with an av
26、erage aperture width of 180 15 4m, dried to constant mass and weighed to the nearest 1 mg, firmly clamped between two stainless steel rings of equal internal diameter between 25 and 50 mm. 1) Dilution of the latex decreases its stability because the balance of free and absorbed soap is changed. 2) S
27、uitable instruments are commercially available. Details may be obtained from the secretariat of ISO/TC 45 (BSI). 3) 1 s1 = 1 Hz = 1 revolution per second (r/s). Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14:1987 2 BSI 10-1999
28、6 Sampling Carry out the sampling in accordance with one of the methods specified in ISO 123. 7 Procedure If the total solids content of the latex is not known, determine it in accordance with ISO 124. If the viscosity of the latex determined with the L instrument (according to ISO 1652) exceeds 200
29、 mPas (200 cP), dilute it to this or a lower value, with an amount of water which reduces the concentration of the latex by not more than 10 % (m/m) total solids. Adjust the temperature of the latex to 25 3 C, pass it through the preliminary filter (5.2) and transfer 50 0,5 g to the latex container
30、(5.1.1). Place the container in position, and stir the latex, ensuring that the rotational frequency of the stirrer (5.1.2) is 14 000 200 min1 (233 3 s1) for the agreed time, between 1 and 30 min, and of such duration that the latex does not increase in temperature to more than 60 C and does not exc
31、eed a height of 100 mm in the container. If it is necessary to limit foaming, a paste of a silicone defoamer shall be smeared around the upper portion of the inner surface of the container. Immediately after the termination of stirring, remove the latex container and wash the stirrer shaft and disk
32、free from latex deposits with the soap solution (clause 4). Wet the test filter (5.3) with the soap solution and pour the latex and washings into the test filter. Use the soap solution to ensure quantitative transfer of all latex and deposits including skin. Wash the residue on the test filter with
33、the soap solution until it is free from latex and then with water until the washings are neutral to litmus. Carefully remove the test filter containing the wet solid matter and swab the underside with filter paper. Dry the test filter and coagulum at 100 5 C until the change in mass is less than 1 m
34、g after 15 min drying. 8 Expression of results The high-speed mechanical stability of the latex shall be reported as the percentage of coagulum which is formed. Calculate it as a percentage by mass of the latex, using the formula where m is the mass, in grams, of coagulum. 9 Test report The test rep
35、ort shall include the following particulars: a) reference to this International Standard; b) identification of the test sample; c) the results and the manner in which they are expressed; d) whether the latex required dilution, and the total solids content at which the latex was tested; e) the durati
36、on of stirring, in minutes; f) the name of the silicone defoamer, if used; g) any unusual features noted during the determination; h) any operation not included in this International Standard or in the International Standards to which reference is made, or regarded as optional. m100 50 - - Licensed
37、Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14:1987 BSI 10-1999 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.14: 198
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