1、BS ISO2006-1:2009ICS 83.040.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDRubber latex, synthetic Determination ofmechanical stabilityPart 1: High-speed methodThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee
2、on 31 October2009. BSI 2009ISBN 978 0 580 63099 6Amendments/corrigenda issued since publicationDate CommentsBS ISO 2006-1:2009National forewordThis British Standard is the UK implementation of ISO 2006-1:2009. Itsupersedes BS 6057-3.14:1987 which is withdrawn.The UK participation in its preparation
3、was entrusted to TechnicalCommittee PRI/50, Rubber - Raw, natural and synthetic, including latexand carbon black.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Us
4、ers are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 2006-1:2009Reference numberISO 2006-1:2009(E)ISO 2009INTERNATIONAL STANDARD ISO2006-1First edition2009-08-15Rubber latex, synthetic Determination of mechanical stabi
5、lity Part 1: High-speed method Latex de caoutchouc synthtique Dtermination de la stabilit mcanique Partie 1: Mthode vitesse leve BS ISO 2006-1:2009ISO 2006-1:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or v
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10、+ 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 2006-1:2009ISO 2006-1:2009(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 Principl
11、e. 2 5 Reagents 2 6 Apparatus 2 7 Sampling 2 8 Procedure 2 9 Expression of results . 3 10 Test report . 4 Annex A (informative) Precision . 5 Bibliography . 7 BS ISO 2006-1:2009ISO 2006-1:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a wo
12、rldwide 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 represented o
13、n 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 drafted
14、 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 Standa
15、rd 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 2006-1 was prepared by
16、 Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry. It cancels and replaces ISO 2006:1985, which has been technically revised. ISO 2006 consists of the following parts, under the general title Rubber latex, sy
17、nthetic Determination of mechanical stability: Part 1: High-speed method Part 2: Moderate-speed method under load BS ISO 2006-1:2009ISO 2006-1:2009(E) ISO 2009 All rights reserved vIntroduction The mechanical stability of synthetic latices is important in a variety of manufacturing processes, and a
18、number of empirical methods are used for testing. This part of ISO 2006 provides a method of determining the mechanical stability by stirring a test portion of latex at a high speed without applying pressure. This part of ISO 2006 is a revision of ISO 2006:1985 which has been rewritten to bring it i
19、nto line with ISO 2006-2, which provides an alternative method of measuring mechanical stability. BS ISO 2006-1:2009BS ISO 2006-1:2009INTERNATIONAL STANDARD ISO 2006-1:2009(E) ISO 2009 All rights reserved 1Rubber latex, synthetic Determination of mechanical stability Part 1: High-speed method WARNIN
20、G 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, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to en
21、sure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method for the determination of the high-speed mechanical stability of synthetic rubber latex. The method is not applicable to compounded synthetic rubber latices. 2 Normative references The foll
22、owing referenced documents are indispensable for the application 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 Det
23、ermination of total solids content ISO 1652, Rubber latex Determination of apparent viscosity by the Brookfield test method ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth 3 Terms and definitions For the purposes of this document, the following term
24、s and definitions apply. 3.1 mechanical stability resistance to coagulation of latex when subjected to mechanical shear under specified conditions NOTE The greater the percentage of coagulum formed wc(A) and wc(B) as defined in 9.2 and 9.3, the poorer the mechanical stability. BS ISO 2006-1:2009ISO
25、2006-1:2009(E) 2 ISO 2009 All rights reserved4 Principle A test portion of latex is stirred at a high speed for a given time, and the coagulum formed is separated and weighed. The mass of coagulum formed is inversely proportional to the mechanical stability. Latices with a viscosity of over 200 mPas
26、 require dilution. 5 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 or, for use with a latex which is coagulated by potassium oleate solution, a 5 % (by mass)
27、solution of a synthetic anionic or non-ionic surfactant. 6 Apparatus Ordinary laboratory apparatus, plus the following: 6.1 Mechanical stability measuring apparatus, consisting of the items specified in 6.1.1 to 6.1.2. 6.1.1 Latex container, flat-bottomed, cylindrical, at least 100 mm high, with an
28、internal diameter of 58 mm 2 mm and a wall thickness of about 2,5 mm. The inner surface shall be smooth, and a glass container is preferred. 6.1.2 Stirring apparatus, consisting of a vertical stainless-steel shaft of sufficient length to reach the bottom of the latex container (6.1.1) and tapering t
29、o approximately 6,3 mm diameter at its lower end. A horizontal, smooth, stainless-steel disc 36,12 mm 0,03 mm in diameter and 1,57 mm 0,05 mm thick is attached to the shaft by means of a threaded stud at the exact centre of the disc. The apparatus shall maintain a stirring speed of 14 000 min1 200 m
30、in1throughout a test, at which frequency the shaft shall not run out of true by more than 0,25 mm. NOTE The stirring disc which is specified has a diameter greater than that specified for natural rubber latex concentrate in ISO 35. 6.1.3 Holder, for the latex container (6.1.1). The holding arrangeme
31、nt shall ensure that the axis of the rotating shaft is concentric with the axis of the latex container and that the bottom of the stirring disc is at 13 mm 1 mm from the inner surface of the bottom of the latex container. 6.2 Preliminary filter, of stainless-steel wire cloth with an average aperture
32、 width of 180 m 10 m, complying with ISO 3310-1. 6.3 Test filter, consisting of a disc of stainless-steel wire cloth with an average aperture 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 eq
33、ual internal diameter between 25 mm and 50 mm. 7 Sampling Carry out sampling in accordance with one of the methods specified in ISO 123. 8 Procedure 8.1 If the total solids content of the latex is not known, determine it in accordance with ISO 124. BS ISO 2006-1:2009ISO 2006-1:2009(E) ISO 2009 All r
34、ights reserved 38.2 If the viscosity of the latex, determined with the L instrument as specified in ISO 1652, exceeds 200 mPas (200 cP), dilute it to this or a lower value with an amount of water (see Clause 5) which reduces the concentration of the latex by no more than 10 % (by mass) total solids
35、content. NOTE Dilution of the latex may decrease its stability since the balance of free and absorbed soap is changed. 8.3 Adjust the temperature of the latex to 25 C 3 C by means of a suitable heating device, then pass it through the preliminary filter (6.2) into a beaker and accurately transfer 50
36、 g 0,5 g to the latex container (6.1.1), recording the mass m. 8.4 Secure the latex container in the holder (6.1.3) of the apparatus and start the stirrer, ensuring that the stirring speed (see 6.1.2) is 14 000 min1 200 min1. Stir the latex for a time between 1 min and 30 min, as agreed between the
37、interested parties, but of duration such that the latex does not increase in temperature to more than 60 C and does not rise to a height exceeding 100 mm in the container. In the case of a latex which contains ammonia, the duration of stirring shall be limited since loss of ammonia by evaporation du
38、ring the test may cause additional destabilization. If it is necessary to control foaming, a paste of a silicone defoamer shall be smeared around the upper part of the inner surface of the container. 8.5 Immediately after the termination of stirring, remove the latex container and wash the stirrer s
39、haft and disc free from latex deposits with surfactant solution (5.1) or water (see Clause 5). Collect the washings in a beaker. 8.6 Wet the test filter (6.3) with surfactant solution or water and pour the latex and washings onto the test filter. Use surfactant solution or water to ensure quantitati
40、ve transfer of all latex and deposits of coagulum, including skin. 8.7 Wash the residue on the test filter with surfactant solution or water until it is free from latex and no longer cloudy, then with water until the washings are clear. 8.8 Carefully remove the test filter containing the wet solid m
41、atter and blot the underside with filter paper. Place the filter on a watch glass. 8.9 Dry the watch glass with the test filter containing the coagulum at 100 C 5 C. After 15 min of drying, transfer to a desiccator and allow to cool to ambient temperature. Then carefully remove the filter from the w
42、atch glass and weigh. Repeat the drying procedure for periods of 15 min until the loss in mass between two successive weighings is less than 1 mg. 8.10 Carry out the procedure described in 8.3 to 8.9 in duplicate. 9 Expression of results 9.1 General There are two methods of expressing the test resul
43、t, as described in 9.2 and 9.3. 9.2 Method A The mechanical stability of the latex is expressed as the percentage by mass of coagulum formed, wc(A), relative to the mass of the test portion of latex, calculated using the following equation: cc100(A)mwm= where mcis the mass of coagulum formed, in gra
44、ms; m is the mass of the test portion, in grams. NOTE The greater the percentage of coagulum formed, the poorer the mechanical stability. BS ISO 2006-1:2009ISO 2006-1:2009(E) 4 ISO 2009 All rights reserved9.3 Method B The mechanical stability of the latex is expressed as the percentage by mass of co
45、agulum formed, wc(B), relative to the total solids content of the latex, calculated using the following equation: cc(B) 100TSC100mwm=where mcis the mass of the dried coagulum, in grams; m is the mass of the test portion, in grams; TSC is the total solids content of the latex sample, as a percentage
46、by mass (see 8.1). NOTE The greater the percentage of coagulum formed, the poorer the mechanical stability. 10 Test report The test report shall include the following: a) a reference to this part of ISO 2006; b) all details necessary for the identification of the sample; c) the method used for the c
47、alculation of the mechanical stability; d) whether the latex required dilution (and, if so, by how much), the total solids content at which the latex was tested and the name of the silicone defoamer used, if any; e) the duration of the test, in minutes; f) the test result, i.e. the percentage by mas
48、s of coagulum formed, rounded up to the second decimal place; g) any unusual features noted during the test; h) details of any operation not included in this part of ISO 2006 or in the International Standards to which reference is made, as well as details of any operation regarded as optional; i) th
49、e date of the test. BS ISO 2006-1:2009ISO 2006-1:2009(E) ISO 2009 All rights reserved 5Annex A (informative) Precision A.1 General An interlaboratory test programme (ITP) to determine the precision of this test method was conducted in 2006 in accordance with ISO/TR 9272, using three synthetic latices and one natural latex (see Table A.1). A type 1 precision was determined, measuring the percentage by mass of coagulum formed relative to the total solids content o
