1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Particle size determination by mechanical sieving ICS 83.080.20Plastics Vinyl chloride homopolymer
2、and copolymer resins BRITISH STANDARDBS ISO 22498:2005BS ISO 22498:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 January 2006 BSI 23 January 2006ISBN 0 580 47076 8The British Standards which implement international publications refer
3、red to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisi
4、ons of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 5 and a back
5、 cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiries on the interpret
6、ation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 22498:2005 and implements it as the UK national standard.The UK participation in its pr
7、eparation was entrusted to Technical Committee PRI/82, Thermoplastic materials, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any Reference numberISO 22498:2005(E)INTERNATIONAL STANDARD ISO22498First edition2005-07-
8、15Plastics Vinyl chloride homopolymer and copolymer resins Particle size determination by mechanical sieving Plastiques Rsines dhomopolymres et de copolymres de chlorure de vinyle Dtermination de la taille des particules par tamisage mcanique BS ISO 22498:2005ii iiiContents Page Foreword iv 1 Scope
9、. 1 2 Normative references . 1 3 Terms and definitions. 1 4 Principle. 2 5 Materials 2 6 Apparatus 2 7 Procedure 2 8 Number of determinations . 3 9 Calculation and expression of results 3 10 Precision 4 11 Test report . 4 BS ISO 22498:2005iv Foreword ISO (the International Organization for Standardi
10、zation) is 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 b
11、e represented 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 Standa
12、rds are drafted 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 Inter
13、national Standard 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 22498 w
14、as prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials. BS ISO 22498:20051Plastics Vinyl chloride homopolymer and copolymer resins Particle size determination by mechanical sieving 1 Scope This International Standard specifies a method for the determinatio
15、n of the size distribution of particles of vinyl chloride homopolymer and copolymer resins by measuring the amounts retained on a selection of sieves having meshes of various aperture sizes. The results can be expressed either in terms of the amount retained on the individual sieves or as the mean p
16、article size for the whole test sample. The method is not recommended for use with sieves having mesh sizes smaller than 0,038 mm. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
17、or undated references, the latest edition of the referenced document (including any amendments) applies. ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings ISO 868, Plastics and ebonite Determination of indentation hardness by means of a d
18、urometer (Shore hardness) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 sieve retention percentage, by mass, of the resin test sample retained on a given sieve at the end of the test procedure 3.2 pan retention percentage, by mass, of the r
19、esin test sample retained in the pan at the bottom of the stack of sieves, or under a single sieve, at the end of the test procedure 3.3 mean particle size single value, expressed to the nearest 0,001 mm, representing the dominant particle of the whole test sample BS ISO 22498:20052 4 Principle A te
20、st sample of resin is sieved through a single sieve, or through a stack of sieves of various mesh sizes, assisted by mechanical shaking. When several sieves are chosen to form a stack, the sieves are assembled in ascending order of mesh size so that the largest mesh size is at the top. 5 Materials 5
21、.1 Antistatic agent: aluminium oxide powder, carbon black or equivalent. 5.2 Blocks of non-sticking rubber, with a Shore A hardness typically between 70 and 80, and with dimensions of approximately 40 mm 10 mm 15 mm. 6 Apparatus 6.1 Balance, accurate to 0,001 g. 6.2 Balance, accurate to 0,1 g, range
22、 and size sufficient to accommodate the individual sieves and the resin retained on them. 6.3 Sieves, nominally 200 mm in diameter, conforming to ISO 565, complete with lid and base pan receiver. It is recommended that sieves with mesh sizes of 0,425 mm, 0,250 mm, 0,150 mm, 0,106 mm, 0,075 mm and 0,
23、063 mm are available as a minimum. In cases of dispute, the sieve mesh sizes to be used shall be agreed between the interested parties. 6.4 Sieve shaker: a mechanical device preferably fitted with an automatic time switch. The device shall be capable of subjecting the sieve, or stack of sieves, to a
24、 uniform vertical motion that is completed by a “tap” or “jerk” at the end of each stroke. The “tapping rate” shall be 150 15 taps per minute. 6.5 Soft-bristle brush. 6.6 Vacuum cleaner, suitable for and electrically safe with very fine powders. 7 Procedure 7.1 Ensure that the sieve or sieves, the l
25、id and the pan are free from resin particles by cleaning with the vacuum cleaner (6.6), releasing any stubborn remains by gentle use of the brush (6.5). 7.2 Examine the sieve or sieves for damage to the mesh or distortion of the mesh matrix. Replace any sieve found to show these defects. 7.3 Weigh t
26、he sieve, or each individual sieve, to the nearest 0,1 g. 7.4 Weigh the pan to the nearest 0,1 g. 7.5 Assemble the sieve or sieves and the pan, one on top of the other, adding two or three blocks of rubber (5.2) to each sieve. When assembling a stack of sieves, ensure that they are assembled in asce
27、nding order of mesh size so that the sieve with the largest apertures is at the top. When using a stack of sieves to determine mean particle size (see 9.3), it is necessary to choose a selection of mesh aperture sizes such that the combined retentions on the top sieve and pan are 99 %. If this is no
28、t the case, the test procedure shall be repeated. 9.3.2 Starting from the top of the stack of sieves, divide the stack into adjacent pairs and calculate the mean size of the resin particles retained on the lower sieve in each pair (that with the smaller mesh size) as follows: 122ddD+= (5) where D is
29、 the average size, in mm, of the resin particles retained on the sieve with the smaller mesh size; d1is the mesh size, in mm, of the sieve with the larger mesh size; d2is the mesh size, in mm, of the sieve with the smaller mesh size. 9.3.3 Calculate the mean particle size for the test sample as foll
30、ows: Mean particle size = (D1 R1) + (D2 R2) + + (Dn Rn) (6) where D1, D2, . Dnare the average particle sizes, in mm, for each of the pairs of sieves forming the stack, calculated using Equation (5); R1, R2, . Rnare the percentages of resin retained on the sieve with the smaller mesh aperture in each
31、 pair. For the purposes of the calculation of the mean particle size, the resin retained on the sieve with the biggest mesh size and in the pan shall be ignored. 10 Precision The precision of this method is not known as interlaboratory data are not available. 11 Test report The test report shall con
32、tain the following particulars: a) a reference to this International Standard; b) all details necessary to identify the resin tested; c) the anti-static agent used; d) the values of the properties determined, i.e. the percentage of the test sample retained on the sieves of various mesh sizes and/or
33、the mean particle size for the whole test sample; e) the date of the test. BS ISO 22498:20055Key 1 wire cloth sieve Figure 1 Typical mechanical sieve-shaking device BS ISO 22498:2005BS ISO BSI389 Chiswick High RoadLondonW4 4AL22498:2005BSI British Standards InstitutionBSI is the independent national
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