1、BS ISO2006-2:2009ICS 83.040.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDRubber latex, synthetic Determination ofmechanical stabilityPart 2: Moderate-speed method underloadThis British Standard was published under the authority of the Standards Policy and S
2、trategy Committee on 31 October 2009. BSI 2009ISBN 978 0 580 59013 9Amendments/corrigenda issued since publicationDate CommentsBS ISO 2006-2:2009National forewordThis British Standard is the UK implementation of ISO 2006-2:2009.The UK participation in its preparation was entrusted to Technical Commi
3、ttee PRI/50, Rubber - Raw, natural and synthetic, including latex and carbon black.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
4、correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 2006-2:2009Reference numberISO 2006-2:2009(E)ISO 2009INTERNATIONAL STANDARD ISO2006-2First edition2009-08-15Rubber latex, synthetic Determination of mechanical stability Part 2: Moderate-speed
5、 method under load Latex de caoutchouc synthtique Dtermination de la stabilit mcanique Partie 2: Mthode vitesse modre sous charge BS ISO 2006-2:2009ISO 2006-2:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or
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8、le for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or uti
9、lized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax
10、 + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Princip
11、le. 1 5 Reagents 2 6 Apparatus 2 7 Sampling 8 8 Procedure 8 9 Expression of results . 10 10 Test report . 10 Annex A (informative) Precision . 11 Bibliography . 14 BS ISO 2006-2:2009ISO 2006-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is
12、 a worldwide federation of national standards bodies (ISO member bodies). 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 represen
13、ted on that committee. International organizations, governmental and non-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 dr
14、afted in accordance with the rules given in the ISO/IEC Directives, Part 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 S
15、tandard requires approval by at least 75 % of the member bodies casting a 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 2006-2 was prepar
16、ed by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry. ISO 2006 consists of the following parts, under the general title Rubber latex, synthetic Determination of mechanical stability: Part 1: High-speed meth
17、od Part 2: Moderate-speed method under load BS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved vIntroduction The mechanical stability of synthetic latices is important in a variety of manufacturing processes, and a number of empirical methods are used for testing. This part of ISO 200
18、6 provides a method of determining the mechanical stability by stirring a latex test portion at a moderate speed under load with shear. It can provide a more accurate indication of latex performance by simulating the actual service conditions. The design of the mechanical stability test machine util
19、ized in this part of ISO 2006 was originally developed by Maron and Ulevitch1, and the mechanical stability of various latices has been studied. It has been concluded that the test is rapid and reliable. BS ISO 2006-2:2009BS ISO 2006-2:2009INTERNATIONAL STANDARD ISO 2006-2:2009(E) ISO 2009 All right
20、s reserved 1Rubber latex, synthetic Determination of mechanical stability Part 2: Moderate-speed method under load WARNING Persons using this part of ISO 2006 should be familiar with normal laboratory practice. This part of ISO 2006 does not purport to address all of the safety problems, if any, ass
21、ociated 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. 1 Scope This part of ISO 2006 specifies a method for the determination of the mechanical stability of synthetic rubber lat
22、ex. This method measures the mass of coagulum formed when a test portion of latex is stirred for a specified length of time at moderate speed under a relatively high shear stress achieved by applying a load. 2 Normative references The following referenced documents are indispensable for the applicat
23、ion of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 123, Rubber latex Sampling ISO 124, Latex, rubber Determination of total solids content ISO 3310-1, Test sieves Te
24、chnical requirements and testing Part 1: Test sieves of metal wire cloth 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 mechanical stability resistance to coagulation of latex when subjected to mechanical shear under specified conditions NOT
25、E The greater the percentage of coagulum formed (wcas defined in Clause 9), the poorer the mechanical stability. 4 Principle A test portion of latex is stirred at a moderate speed under load for a given time, and the coagulum formed is separated and weighed. The mass of coagulum formed is inversely
26、proportional to the mechanical stability. BS ISO 2006-2:2009ISO 2006-2:2009(E) 2 ISO 2009 All rights reserved5 Reagents During the analysis, use only carbonate-free distilled water or water of equivalent purity. 5.1 Surfactant solution: 5 % (by mass) solution of potassium oleate of pH value 10 0,5 o
27、r, for use with a latex which is coagulated by potassium oleate solution, a 5 % (by mass) solution of a synthetic anionic or non-ionic surfactant. 6 Apparatus 6.1 Mechanical stability tester1), designed to rotate a disc attached to a spindle shaft at a constant stirring speed of 1 000 min1 20 min1wh
28、ile applying a constant load to the latex container (6.2). The device shall be capable of maintaining a load of up to 500 N to within 2 N. An example of a tester is shown in Figure 1. 6.2 Latex container, comprising a flat-bottomed plate with a grooved pattern cut into it as shown in Figure 2, a pol
29、yethylene liner disc 1,6 mm thick with four holes as shown in Figure 3 and a cylindrical wall with flange assembled with the flat-bottomed plate as shown in Figures 4 and 5. 6.3 Rotating disc, consisting of a vertical stainless-steel shaft 9,5 mm in diameter attached to a disc (also made of stainles
30、s steel) with four grooves cut into it. Detailed dimensions are shown in Figure 6. 6.4 Preliminary filter, of stainless-steel wire cloth with an average aperture width of 180 m 10 m, complying with ISO 3310-1. 6.5 Test filter, consisting of a disc of stainless-steel wire cloth with an average apertu
31、re width of 180 m 10 m, complying with ISO 3310-1, dried to constant mass and weighed to the nearest 1 mg, firmly clamped between two stainless-steel rings of equal internal diameter between 25 mm and 50 mm. 1) Suitable instruments are available commercially, e.g. from Ueshima Seisakusho Co., Ltd.,
32、1053-1 Yaho Kunitachi-shi, Tokyo 186-0011, Japan, Fax:+81-4-2573-1520, and Kumagai Riki Kogyo Co., Ltd., 2-4, Toyotama-kita 3-Chome, Nerima-ku, Tokyo 176-0012, Japan, Fax: +81-3-3994-0520. This information is given for the convenience of users of this part of ISO 2006 and does not constitute an endo
33、rsement by ISO of these instruments. BS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved 3Key 1 spindle shaft 2 rotating disc 3 latex container 4 test portion of latex 5 flat-bottomed plate 6 load cell or scale 7 direction of loading 8 direction of rotation Figure 1 Mechanical stabilit
34、y tester BS ISO 2006-2:2009ISO 2006-2:2009(E) 4 ISO 2009 All rights reservedDimensions in millimetres Key 1 groove, 1,6 mm in depth Figure 2 Flat-bottomed plate BS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved 5Dimensions in millimetres Key 1 disc, 1,6 mm in thickness Figure 3 Polye
35、thylene liner disc BS ISO 2006-2:2009ISO 2006-2:2009(E) 6 ISO 2009 All rights reservedDimensions in millimetres Figure 4 Latex container BS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved 7Key 1 positioning lines 2 cylindrical wall with flange 3 polyethylene liner disc 4 flat-bottomed
36、 plate Figure 5 Assembling the latex container BS ISO 2006-2:2009ISO 2006-2:2009(E) 8 ISO 2009 All rights reservedDimensions in millimetres Figure 6 Shaft and rotating disc 7 Sampling Carry out sampling in accordance with one of the methods specified in ISO 123. 8 Procedure 8.1 General A test portio
37、n is stirred under shear stress created by the patterned disc which is maintained in contact with the polyethylene liner disc under constant load. The mass of coagulum formed after a specified time is measured. If the total solids content of the latex is not known, determine it in accordance with IS
38、O 124. BS ISO 2006-2:2009ISO 2006-2:2009(E) ISO 2009 All rights reserved 98.2 Preliminary run of the apparatus 8.2.1 Assemble the latex container (6.2) by mounting the polyethylene liner disc between the flange of the cylindrical wall and the flat-bottomed plate and fix them together with bolts as s
39、hown in Figures 4 and 5, aligning the positioning marks on the polyethylene disc, the flat-bottomed plate and the flange of the cylindrical wall so that the polyethylene disc can be inserted in exactly the same position again. When a new polyethylene disc is used, mark a positioning line on it with
40、a scratch or paint mark to facilitate maintaining the exact alignment when reassembling. 8.2.2 Place the latex container filled with water in position in the tester and set the rotating disc on the spindle. Then apply a force of 98 N to the container. Start to stir at a rate of 1 000 min1 20 min1. A
41、djust the apparatus if the applied load varies by more than 5 N. 8.2.3 Stop running the apparatus after a few minutes. When a new polyethylene liner disc is used, run for at least one hour to condition it to the rotating disc. 8.3 Test 8.3.1 Depending on the latex under test, the load used can be 49
42、 N, 98 N or 147 N and the duration of the test either 300 s or 600 s. The precise conditions shall be established for a given type of latex in a preliminary trial. 8.3.2 Pass the test sample through the preliminary filter (6.4) and cover it to protect it from dust and drying. Note the temperature of
43、 the latex. 8.3.3 Place a 50 g 0,5 g test portion of the latex in the latex container. 8.3.4 Place the latex container securely in the tester and mount the rotating disc and shaft. Apply the appropriate load of 49 N 2 N, 98 N 2 N or 147 N 2 N (see 8.3.1). Reset the load scale to zero. 8.3.5 Start th
44、e stirrer motor and record the starting time. Adjust the apparatus if the variation in the measured applied load exceeds 5 N. 8.3.6 Stop the test after 300 s or 600 s, unless otherwise specified. Measure and record the temperature of the latex in the container. NOTE The duration selected for the tes
45、t depends on the mechanical stability of the latex. 8.3.7 Remove the shaft and rotating disc and wash them free from latex deposits with surfactant solution (5.1) or water (see Clause 5). 8.3.8 Wet the test filter (6.5) with surfactant solution or water and pour the latex and washings onto the test
46、filter. Use surfactant solution or water to ensure quantitative transfer of all the latex and deposits of coagulum, including any skin which might have formed. 8.3.9 Wash the residue on the test filter with surfactant solution or water until it is free from latex and then with water until the washin
47、gs are neutral to litmus. 8.3.10 Carefully remove the test filter containing the wet solid matter and blot the underside with filter paper. 8.3.11 Dry the test filter and coagulum on a watch glass at 100 C 5 C. After 15 min of drying, transfer to a desiccator and allow to cool to ambient temperature
48、, then weigh. Repeat the drying procedure for periods of 15 min until the loss in mass between two successive weighings is less than 1 mg. 8.3.12 If the amount of coagulum formed is too small or too large for an accurate evaluation of the mechanical stability of the latex, repeat the procedure from
49、8.3.2 to 8.3.11, changing either the load or the duration of the run or both. BS ISO 2006-2:2009ISO 2006-2:2009(E) 10 ISO 2009 All rights reservedNOTE In practice, once meaningful conditions (see 8.3.4 and 8.3.6) have been established for a given latex, it should be possible to adhere to them on a routine basis. 8.3.13 Carry out the procedure described in 8.3.2 to 8.3.11 in duplicate under the same test conditions. 9 Expression of results The per
